U.S. patent application number 16/323986 was filed with the patent office on 2019-07-11 for seat frame.
The applicant listed for this patent is TS TECH CO., LTD.. Invention is credited to Hiroshi Baba, Yuki Hosokawa, Takaya Kurisu.
Application Number | 20190210497 16/323986 |
Document ID | / |
Family ID | 61161831 |
Filed Date | 2019-07-11 |
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United States Patent
Application |
20190210497 |
Kind Code |
A1 |
Baba; Hiroshi ; et
al. |
July 11, 2019 |
SEAT FRAME
Abstract
To reduce the weight of a cross member bridged between right and
left sides of a seat frame. A seat frame includes an upper frame
forming an upper portion of a seat back frame, and a cross member
bridged at the upper frame. The cross member includes right and
left end portions in a seat width direction, the right and left end
portions being fixed to the upper frame; and a first recessed
portion that is recessed upward or downward and provided between
the right and left end portions. The first recessed portion is
provided at a center portion of the cross member in the seat width
direction.
Inventors: |
Baba; Hiroshi; (Tochigi,
JP) ; Hosokawa; Yuki; (Tochigi, JP) ; Kurisu;
Takaya; (Tochigi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TS TECH CO., LTD. |
Asaka-shi, Saitama |
|
JP |
|
|
Family ID: |
61161831 |
Appl. No.: |
16/323986 |
Filed: |
August 8, 2017 |
PCT Filed: |
August 8, 2017 |
PCT NO: |
PCT/JP2017/028846 |
371 Date: |
February 7, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60N 2/68 20130101; B60N
2/42709 20130101; B60N 2/427 20130101; B60N 2/682 20130101; B60N
2/42745 20130101; B60N 2/686 20130101; B60N 2/897 20180201 |
International
Class: |
B60N 2/68 20060101
B60N002/68; B60N 2/427 20060101 B60N002/427 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 9, 2016 |
JP |
2016-156889 |
Mar 31, 2017 |
JP |
PCT/JP2017/013793 |
Claims
1. A seat frame of a vehicle seat, comprising: an upper frame
forming an upper portion of a seat back frame; and a cross member
bridged at the upper frame, wherein the cross member includes right
and left end portions in a seat width direction, the right and left
end portions being fixed to the upper frame, and a first recessed
portion that is recessed upward or downward and provided between
the right and left end portions.
2. The seat frame according to claim 1, wherein the first recessed
portion is provided at a center portion of the cross member in the
seat width direction.
3. The seat frame according to claim 1, wherein the cross member
includes a reinforcement portion formed at the first recessed
portion.
4. The seat frame according to claim 3, wherein the cross member
includes wide portions provided on right and left sides of the
first recessed portion in the seat width direction, and the
reinforcement portion is formed across the first recessed portion
and both of the wide portions.
5. The seat frame according to claim 4, wherein the cross member is
provided with a through-hole.
6. The seat frame according to claim 5, wherein the through-hole is
formed at each wide portion.
7. The seat frame according to claim 6, wherein the through-hole is
formed at the reinforcement portion at each wide portion.
8. The seat frame according to claim 4, wherein at least part of
each wide portion is curved to protrude backward.
9. The seat frame according to claim 1, further comprising: a
second recessed portion different from the first recessed portion,
the second recessed portion being provided at least at one of an
upper or lower end of the cross member.
10. The seat frame according to claim 1, further comprising: a
flange portion provided at least at one of an upper or lower end of
the cross member, wherein the flange portion is formed at a
position facing the first recessed portion in an upper-to-lower
direction.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a National Stage Entry application of
PCT Application No. PCT/JP2017/028846, filed Aug. 8, 2017, which
claims the priority benefit of Japanese Patent Application No. JP
2016-156889, filed on Aug. 9, 2016 and PCT Application No.
PCT/JP2017/013793, filed Mar. 31, 2017, the contents of each being
incorporated herein by reference.
BACKGROUND
[0002] The present disclosure relates to a seat frame of a vehicle
seat, and particularly relates to a seat frame configured so that
the weight thereof can be reduced.
[0003] Weight reduction has been demanded for a seat frame forming
a framework of a seat mounted on a conveyance such as an
automobile. For example, in Japanese Patent Publication JP
2015-067168, a thin plate-shaped frame is used for a side frame
forming a side portion of a seat frame, and in this manner, the
weight of the frame is reduced.
[0004] Some frames are configured such that a cross member bridged
between right and left sides is provided at an upper portion of a
seat back frame. Weight reduction in such a cross member is also an
issue.
SUMMARY
[0005] The present disclosure has been made in view of the
above-described problem, and an embodiment of the present
disclosure provides a seat frame configured so that the weight of a
cross member bridged between right and left sides of the seat frame
can be reduced.
[0006] According to an embodiment, the above-described problem is
solved by a seat frame of a vehicle seat, which includes an upper
frame forming an upper portion of a seat back frame and a cross
member bridged at the upper frame. The cross member includes right
and left end portions in a seat width direction, the right and left
end portions being fixed to the upper frame; and a first recessed
portion that is recessed upward or downward and provided between
the right and left end portions. According to the above-described
seat frame, the weight of the cross member can be reduced as
compared to the case of providing no recessed portion at the cross
member. Thus, the weight of the cross member bridged between right
and left sides of the seat frame can be reduced.
[0007] In the above-described seat frame, the first recessed
portion is preferably provided at a center portion of the cross
member in the seat width direction. The first recessed portion is
provided at a position facing an occupant as described above, and
therefore, a feeling of sitting on the seat can be improved.
Moreover, according to the above-described seat frame, a space
where a member is arranged can be provided in the vicinity of the
center portion of the cross member.
[0008] In the above-described seat frame, the cross member
preferably includes a reinforcement portion formed at the first
recessed portion. With this configuration, lowering of the
stiffness of the vicinity of the first recessed portion of the
cross member can be suppressed.
[0009] In the above-described seat frame, the cross member
preferably includes wide portions provided on right and left sides
of the first recessed portion in the seat width direction, and the
reinforcement portion is preferably formed across the first
recessed portion and both of the wide portions. With this
configuration, the stiffness of the cross member can be
improved.
[0010] In the above-described seat frame, the cross member is
preferably provided with a through-hole. With this configuration,
the weight of the cross member can be further reduced.
[0011] In the above-described seat frame, the through-hole is
preferably formed at each wide portion. The through-hole is formed
at the wide portion as described above, and therefore, a larger
through-hole can be formed as compared to the case of forming the
through-hole at the first recessed portion. Thus, the weight of the
cross member can be further reduced.
[0012] In the above-described seat frame, the through-hole is
preferably formed at the reinforcement portion at each wide
portion. With this configuration, weight reduction in the cross
member can be realized, and lowering of the stiffness of the cross
member can be also suppressed.
[0013] In the above-described seat frame, at least part of each
wide portion is preferably curved to protrude backward. With this
configuration, the stiffness of the cross member can be improved.
Moreover, the cross member can be formed in a shape matching the
body shape of the occupant, and therefore, the feeling of sitting
on the seat can be improved.
[0014] In the above-described seat frame, the seat frame preferably
further includes a second recessed portion different from the first
recessed portion, the second recessed portion being provided at
least at one of an upper or lower end of the cross member. With
this configuration, the weight of the cross member can be further
reduced. Moreover, a member such as a cover stop member can be
stopped at the second recessed portion. Thus, the number of
components forming the seat can be reduced. Consequently, the
weight of the seat can be reduced.
[0015] In the above-described seat frame, the seat frame preferably
further includes a flange portion provided at least at one of the
upper or lower end of the cross member. The flange portion is
preferably formed at a position facing the first recessed portion
in an upper-to-lower direction. With this configuration, lowering
of the stiffness of the first recessed portion can be
suppressed.
[0016] According to an embodiment, the weight of the cross member
bridged between the right and left sides of the seat frame can be
reduced. According to an embodiment, the feeling of sitting on the
seat can be improved. According to an embodiment, lowering of the
stiffness of the vicinity of the first recessed portion of the
cross member can be suppressed. According to an embodiment, the
stiffness of the cross member can be improved. According to an
embodiment, a larger through-hole can be formed at the cross
member. According to an embodiment, weight reduction in the cross
member can be realized, and lowering of the stiffness of the cross
member can be suppressed. According to an embodiment, the number of
components forming the seat can be reduced.
BRIEF DESCRIPTION OF DRAWINGS
[0017] FIG. 1 is a perspective view of a seat frame according to
the present embodiment.
[0018] FIG. 2 is a left side view of a seat back frame.
[0019] FIG. 3A is an outer side view of a side frame.
[0020] FIG. 3B is a rear view of the side frame of FIG. 3A. FIG. 3C
is an inner side view of the side frame.
[0021] FIG. 4 is an enlarged partial view of the periphery of a
second coupling bracket from a view point IV of FIG. 1.
[0022] FIG. 5A is an outer side view of a first coupling
bracket.
[0023] FIG. 5B is a rear view of the first coupling bracket of FIG.
5A.
[0024] FIG. 5C is an inner side view of the first coupling bracket
of FIG. 5A.
[0025] FIG. 6A is an outer side view of the second coupling bracket
of FIG. 4.
[0026] FIG. 6B is a rear view of the second coupling bracket of
FIG. 4.
[0027] FIG. 6C is an inner side view of the second coupling
bracket.
[0028] FIG. 7 is an enlarged partial view of a front side of the
seat frame.
[0029] FIG. 8 is an enlarged partial view of a rear side of the
seat frame.
[0030] FIG. 9 is a sectional view along an IX-IX line of FIG.
7.
[0031] FIG. 10 is a sectional view along an X-X line of FIG. 7.
[0032] FIG. 11 is an enlarged partial view from a view point XI of
FIG. 7.
[0033] FIG. 12A is a view of a variation of reinforcement portions
provided at the side frame.
[0034] FIG. 12B is a view of another variation of the reinforcement
portions provided at the side frame.
[0035] FIG. 12C is a view of still another variation of the
reinforcement portions provided at the side frame.
[0036] FIG. 12D is a view of still another variation of the
reinforcement portions provided at the side frame.
[0037] FIG. 13 is a view of an upper portion of a seat frame
according to a second embodiment.
[0038] FIG. 14 is a sectional view along an XIV-XIV line of FIG.
13.
[0039] FIG. 15 is a sectional view along an XV-XV line of FIG.
13.
[0040] FIG. 16 is a sectional view along an XVI-XVI line of FIG.
13.
[0041] FIG. 17 is a sectional view along an XVII-XVII line of FIG.
13.
[0042] FIG. 18 is a view for describing a state in which a blower
and stop members are attached to a seat back frame according to the
second embodiment.
DETAILED DESCRIPTION
[0043] Hereinafter, a seat frame 1 according to an embodiment
(hereinafter referred to as a "present embodiment") of the present
disclosure is described with reference to FIGS. 1 to 18. The seat
frame 1 forms a framework of a vehicle seat mounted on a vehicle.
Note that the embodiments described below are set forth merely as
examples for the sake of easy understanding of the present
disclosure, and are not intended to limit the embodiments. That is,
changes and modifications can be made to the shapes, dimensions,
arrangements, etc. of members described below without departing
from the gist of the present disclosure, and needless to say, the
invention includes equivalents thereof.
[0044] In the description below, a "front-to-rear direction" means
a front-to-rear direction as viewed from a seated person on the
vehicle seat, and is a direction coincident with a traveling
direction of the vehicle. A "seat width direction" means a
horizontal width direction of the vehicle seat, and is coincident
with a right-to-left direction as viewed from the seated person on
the vehicle seat. Moreover, an "upper-to-lower direction" means a
height direction of the vehicle seat, and is coincident with an
upper-to-lower direction when the vehicle seat is viewed from the
front.
[0045] Outline of Seat Frame 1
[0046] First, an outline of a configuration of the seat frame 1 is
described with reference to FIG. 1. As illustrated in FIG. 1, the
seat frame 1 mainly includes a seat back frame 10 and a seat
cushion frame 20. The seat back frame 10 forms a framework of a
backrest portion of the seat frame 1, and the seat cushion frame 20
forms a framework of a seating portion of the seat frame 1.
[0047] As illustrated in FIG. 1, the seat back frame 10 includes an
inverted U-shaped upper frame 11, a pair of side frames 12 forming
right and left end portions in the seat width direction, and a
lower frame 13 coupling lower end portions of the pair of side
frames 12.
[0048] The upper frame 11 is welded to the side frames 12 at upper
frame side portions 11A forming both lower portions of the upper
frame 11. Moreover, headrest attachment portions 17 are, by
welding, attached to an upper end of the upper frame 11. The
headrest attachment portions 17 are tubular bodies into which two
headrest stays hanging down from a not-shown headrest are
inserted.
[0049] A cross member 14 is bridged between both end portions of
the upper frame 11 above the upper frame side portions 11A. Right
and left end portions 14B of the cross member 14 are welded and
fixed to right and left bent portions of the upper frame 11. Note
that the bent portion of the upper frame 11 is a portion of the
upper frame 11 coupling a portion attached to the headrest
attachment portion 17 and a portion attached to the side frame 12.
In the case of demanding weight reduction, a recessed portion 14A
recessed upward of the seat is formed between the right and left
end portions 14B of the cross member 14. Specifically, the recessed
portion 14A is formed at a center portion of the cross member 14 in
the seat width direction. In other words, the recessed portion 14A
is provided between the right and left headrest attachment portions
17. As described above, the recessed portion 14A is formed at the
cross member 14 of the seat frame 1, and in this manner, the weight
of the seat frame 1 is reduced. Note that the recessed portion 14A
is formed at a lower end of the cross member 14, but may be formed
at an upper end. In the case of forming the recessed portion 14A at
the upper end, the recessed portion 14A is a portion recessed
downward of the seat. Alternatively, the recessed portion 14A may
be formed at each of the upper and lower ends of the cross member
14.
[0050] As illustrated in FIG. 1, a rotary shaft 16 for reclining
units 40 is attached between the lower end portions of the right
and left side frames 12 with the rotary shaft 16 penetrating the
right and left side frames 12. Note that a reclining operation
section is operated to operate the reclining units 40, and in this
manner, the angle of the seat back frame 10 with respect to the
seat cushion frame 20 can be adjusted.
[0051] A pressure receiving member 15 configured to receive a load
from an occupant is bridged at a center portion of the seat back
frame 10. The pressure receiving member 15 described herein
includes a support portion 15A, a wire 15B, and wires 15C. The
support portion 15A is configured to support the back of the
occupant, and includes an elastic member such as a plate spring or
an S-spring, for example. Note that a surface of the support
portion 15A at the front of the seat is referred to as a "support
surface." The wire 15B is stopped at the support portion 15A and a
front wall portion 13B of the lower frame 13. Specifically, the
wire 15B is stopped at the front wall portion 13B of the lower
frame 13 by means of clips 50 fitted in through-holes formed at the
front wall portion 13B. The wires 15C are stopped at side portions
of the support portion 15A and the side frames 12. As described
above, the support portion 15A is fixed to the seat back frame 10
with the wire 15B and the wires 15C.
[0052] Next, the seat cushion frame 20 is described. As illustrated
in FIG. 1, the seat cushion frame 20 is in an outer square frame
shape as viewed from above. Moreover, the seat cushion frame 20
includes, as main components, cushion side frames 22A, 22B each
formed at right and left end portions in the seat width direction,
a pan frame 21 forming a front end portion of the seat cushion
frame 20, and a coupling pipe 23 coupling the right and left
cushion side frames 22A, 22B. For example, the coupling pipe 23 is
a hollow member such as a round pipe, and a rear end of a pressure
receiving member 24 configured to support the buttocks of the
occupant is attached to the coupling pipe 23.
[0053] As illustrated in FIG. 1, a first coupling bracket 18 is
attached to an upper portion of a rear end portion of the left
cushion side frame 22A. Moreover, the left side frame 12 is coupled
to the first coupling bracket 18 via the reclining unit 40.
Moreover, as illustrated in FIG. 4, a second coupling bracket 19 is
attached to an upper portion of a rear end portion of the right
cushion side frame 22B. Moreover, the right side frame 12 is
coupled to the second coupling bracket 19 via the reclining unit
40. Note that details of configurations of the first coupling
bracket 18 and the second coupling bracket 19 are described
below.
[0054] Configuration of Side Frame 12
[0055] Next, a configuration of the side frame 12 is described with
reference to FIGS. 2, 3A, 3B, and 3C. FIG. 2 is a left side view of
the seat back frame 10. FIG. 3A is an outer side view of the side
frame 12, FIG. 3B is a rear view of the side frame 12, and FIG. 3C
is an inner side view of the side frame 12.
[0056] As illustrated in FIGS. 2, 3A, and 3C, a side frame side
portion 12A forming a side portion of the side frame 12 is provided
with multiple through-holes including an airbag attachment hole
31A, an airbag attachment hole 31B, an airbag attachment hole 31C,
and a through-hole 31D. The airbag attachment hole 31A, the airbag
attachment hole 31B, and the airbag attachment hole 31C are
through-holes used for attachment of an airbag unit. The airbag
unit described herein includes an airbag body, webbing configured
to guide an airbag in a deploying direction thereof, and an airbag
attachment plate, for example. For example, the airbag attachment
hole 31B and the airbag attachment hole 31C are holes for
attachment of the webbing of the airbag, and the airbag attachment
hole 31A is a hole into which a bolt extending from a retainer of
the airbag body is inserted. The through-hole 31D is formed at a
position facing a lower end of the upper frame side portion 11A,
and the side frame 12 and the upper frame 11 are welded to each
other at the through-hole 31D.
[0057] As illustrated in FIGS. 2, 3A, and 3C, a first reinforcement
portion 30A extending along a rear edge 12C of the side frame side
portion 12A forming the side portion of the side frame 12 is formed
at the side frame side portion 12A. Note that the rear edge 12C is
a bent portion as a boundary between the side frame side portion
12A forming a side surface of the side frame 12 and a side frame
rear portion 12B forming a rear surface of the side frame 12. The
first reinforcement portion 30A is, for example, configured as a
bead portion formed in such a manner that part of the side frame
side portion 12A is recessed inward of the seat by pressing. The
first reinforcement portion 30A described herein is provided at
least at a wide portion 12D having the greatest width at the side
frame side portion 12A. In the present embodiment, the first
reinforcement portion 30A is provided along the rear edge 12C from
a position facing the through-hole 31D to a position facing the
airbag attachment hole 31C in the upper-to-lower direction. That
is, the first reinforcement portion 30A is provided at least at a
position at which the side frame 12 and the upper frame side
portion 11A overlap with each other, and therefore, the strength of
a joint portion between the side frame 12 and the upper frame 11
can be enhanced. Note that an upper end of the first reinforcement
portion 30A may be positioned above the position of welding between
the side frame 12 and the upper frame 11. Moreover, as illustrated
in FIG. 2, the first reinforcement portion 30A is provided at such
a position that the first reinforcement portion 30A overlaps with
the upper frame 11 and the cushion side frames 22A, 22B in the
upper-to-lower direction as viewed laterally.
[0058] As illustrated in FIGS. 2, 3A, and 3C, a second
reinforcement portion 30B extending forward of the seat from a
portion between upper and lower ends of the first reinforcement
portion 30A is formed at the side frame side portion 12A forming
the side portion of the side frame 12. As in the first
reinforcement portion 30A, the second reinforcement portion 30B is
configured as a bead portion formed in such a manner that part of
the side frame side portion 12A is recessed inward of the seat by
pressing. The second reinforcement portion 30B described herein is
formed between the airbag attachment hole 31A and the airbag
attachment hole 31B. Note that a rear end of the second
reinforcement portion 30B is connected to the first reinforcement
portion 30A, and the second reinforcement portion 30B and the first
reinforcement portion 30A are integrated. Moreover, a front end of
the second reinforcement portion 30B is positioned forward of the
seat with respect to the airbag attachment hole 31B, and is
positioned backward of the seat with respect to a front edge of the
side frame side portion 12A.
[0059] As illustrated in FIGS. 2, 3A, and 3C, a third reinforcement
portion 30C extending forward of the seat from the lower end of the
first reinforcement portion 30A is formed at the side frame side
portion 12A forming the side portion of the side frame 12. As in
the first reinforcement portion 30A, the third reinforcement
portion 30C is configured as a bead portion formed in such a manner
that part of the side frame side portion 12A is recessed inward of
the seat by pressing. The third reinforcement portion 30C described
herein is formed between the airbag attachment hole 31A and the
airbag attachment hole 31C. Note that a rear end of the third
reinforcement portion 30C is connected to the first reinforcement
portion 30A, and the third reinforcement portion 30C and the first
reinforcement portion 30A are integrated. Moreover, a front end of
the third reinforcement portion 30C is positioned forward of the
seat with respect to the airbag attachment hole 31C, and is
positioned backward of the seat with respect to the front edge of
the side frame side portion 12A.
[0060] FIG. 2 also illustrates a vertical line V at a position
overlapping with a rear end of the third reinforcement portion 30C.
As illustrated in FIG. 2, the rear end of the third reinforcement
portion 30C is provided forward of the cross member 14. In other
words, the cross member 14 is provided at the rear of the third
reinforcement portion 30C.
[0061] Moreover, as illustrated in FIG. 2, the second reinforcement
portion 30B extends from the first reinforcement portion 30A at an
angle (i.e., a substantially right angle) substantially
perpendicular to a torso line T indicating the axis of a body of a
three-dimensional mannequin (not shown) representing the occupant
seating on the vehicle seat including the seat frame 1 as the
framework. On the other hand, the third reinforcement portion 30C
extends from the first reinforcement portion 30A at an angle (i.e.,
an acute angle) not perpendicular to the torso line T. That is, the
second reinforcement portion 30B and the third reinforcement
portion 30C are different from each other in the angle of extension
from the first reinforcement portion 30A. As described above, the
extension angles of the first reinforcement portion 30A, the second
reinforcement portion 30B, and the third reinforcement portion 30C
vary so that stiffness against load input from various directions
can be enhanced. Moreover, each of the first reinforcement portion
30A, the second reinforcement portion 30B, and the third
reinforcement portion 30C is, in the upper-to-lower direction,
provided above the reclining unit 40.
[0062] Bottom portions (i.e., bottom portions of the beads) of the
first reinforcement portion 30A, the second reinforcement portion
30B, and the third reinforcement portion 30C inside the seat are
positioned outward of the seat with respect to an end portion of a
flange provided at the front of the side frame 12. An upper end
portion of the first reinforcement portion 30A may be narrowed as
compared to a lower end portion thereof. Front end portions of the
second reinforcement portion 30B and the third reinforcement
portion 30C may be narrowed as compared to rear portions thereof.
The front end portions of the second reinforcement portion 30B and
the third reinforcement portion 30C may be positioned forward of
the front wall portion 13B of the lower frame 13, the support
portion 15A of the pressure receiving member 15, attachment
portions of the reclining units 40, the headrest attachment
portions 17, and the rotary shaft 16. Any of the first
reinforcement portion 30A, the second reinforcement portion 30B,
and the third reinforcement portion 30C may be positioned forward
of the headrest attachment portions 17.
[0063] As illustrated in FIG. 3B, a rear reinforcement portion 30D
is formed at a center portion of the side frame rear portion 12B of
the side frame 12. A through-hole 31E and a through-hole 31F are
each formed at upper and lower portions of the side frame rear
portion 12B. The rear reinforcement portion 30D is configured as a
bead portion formed in such a manner that part of the side frame
rear portion 12B is recessed inward of the seat by pressing. The
rear reinforcement portion 30D extends from a position facing the
upper end of the first reinforcement portion 30A to a position
below the lower end of the first reinforcement portion 30A.
Moreover, the rear reinforcement portion 30D is formed such that an
upper end of the rear reinforcement portion 30D is positioned above
the through-hole 31E formed at the side frame rear portion 12B and
a lower end of the rear reinforcement portion 30D is positioned
below the through-hole 31F formed at the side frame rear portion
12B. A center portion of the rear reinforcement portion 30D
positioned between the through-hole 31E and the through-hole 31F is
a wide portion that is wider than the upper and lower ends.
Moreover, the lower end of the rear reinforcement portion 30D is at
a position overlapping with the lower frame 13 in the
upper-to-lower direction. As described above, the rear
reinforcement portion 30D is formed at the side frame rear portion
12B so that the strength of the side frame rear portion 12B can be
enhanced across a broad area.
[0064] As described above, an integrated inverted F-shaped bead
portion of the first reinforcement portion 30A, the second
reinforcement portion 30B, and the third reinforcement portion 30C
is provided at the side frame side portion 12A of the side frame
12. Thus, the strength of the side frame side portion 12A can be
improved in a balanced manner across a broad area. Moreover, the
first reinforcement portion 30A is provided along the rear edge 12C
so that the strength of the rear edge 12C can be enhanced. Further,
the first reinforcement portion 30A is provided at least at the
wide portion 12D of the side frame side portion 12A, and therefore,
the strength of the wide portion 12D can be enhanced even in the
case of forming various through-holes for attaching components such
as the airbag to the wide portion 12D. In addition, the airbag
attachment hole 31A is formed at a position sandwiched in the
upper-to-lower direction by the second reinforcement portion 30B
and the third reinforcement portion 30C, and therefore, the
strength of the periphery of the airbag attachment hole 31A can be
enhanced. Moreover, the second reinforcement portion 30B is
provided between the airbag attachment hole 31A and the airbag
attachment hole 31B, and therefore, the strength of the periphery
of the airbag attachment hole 31A and the airbag attachment hole
31B can be enhanced. Further, the third reinforcement portion 30C
is provided between the airbag attachment hole 31A and the airbag
attachment hole 31C, and therefore, the strength of the periphery
of the airbag attachment hole 31A and the airbag attachment hole
31C can be enhanced.
[0065] Configurations of First Coupling Bracket 18 and Second
Coupling Bracket 19
[0066] Next, the configurations of the first coupling bracket 18
and the second coupling bracket 19 is described with reference to
FIGS. 1 and 4 to 6C.
[0067] FIG. 4 is an enlarged partial view of the periphery of the
second coupling bracket 19 from a view point IV of FIG. 1. FIGS.
5A, 5B, and 5C each correspond to an outer side view, a rear view,
and an inner side view of the first coupling bracket 18. FIGS. 6A,
6B, and 6C each correspond to an outer side view, a rear view, and
an inner side view of the second coupling bracket 19.
[0068] As illustrated in FIGS. 5A, 5B, and 5C, the first coupling
bracket 18 includes a weak portion 18A, a shaft through-hole 18B, a
bolt fastening hole 18C, and a bolt fastening hole 18D. The weak
portion 18A is a portion provided between the shaft through-hole
18B and the bolt fastening hole 18D and bent outward of the seat.
In a case where a load is input to the first coupling bracket 18,
the first coupling bracket 18 is easily deformable at the weak
portion 18A. The rotary shaft 16 is inserted into the shaft
through-hole 18B, and the left reclining unit 40 is attached to the
shaft through-hole 18B. The left side frame 12 is coupled to the
first coupling bracket 18 via the left reclining unit 40. The left
cushion side frame 22A is fixed to the bolt fastening hole 18C and
the bolt fastening hole 18D with fastening tools such as bolts and
nuts. For example, upon rear collision of the vehicle, the weak
portion 18A of the first coupling bracket 18 deforms to absorb
impact.
[0069] As illustrated in FIGS. 6A, 6B, and 6C, the second coupling
bracket 19 includes a weak portion 19A, a shaft through-hole 19B, a
bolt fastening hole 19C, a bolt fastening hole 19D, and a weak
portion 19E. The weak portion 19A is a portion provided between the
shaft through-hole 19B and the bolt fastening hole 19D and bent
outward of the seat. In a case where a load is input to the second
coupling bracket 19, the second coupling bracket 19 is easily
deformable at the weak portion 19A. The rotary shaft 16 is inserted
into the shaft through-hole 19B, and the right reclining unit 40 is
attached to the shaft through-hole 19B. The right side frame 12 is
coupled to the second coupling bracket 19 via the right reclining
unit 40. The right cushion side frame 22B is fixed to the bolt
fastening hole 19C and the bolt fastening hole 19D via fastening
tools such as bolts and nuts. Moreover, the weak portion 19E is a
portion provided between the shaft through-hole 19B and the bolt
fastening hole 19C and bent outward of the seat. In a case where a
load is input to the second coupling bracket 19, the second
coupling bracket 19 is easily deformable at the weak portion 19E.
For example, upon rear collision of the vehicle, the weak portion
19A and the weak portion 19E of the second coupling bracket 19
deform to absorb impact.
[0070] Note that regarding the weak portion 18A of the first
coupling bracket 18, a first connection portion with a shaft
through-hole 18B side and a second connection portion with a bolt
fastening hole 18D side are at the substantially same position in
the seat width direction. That is, at the first coupling bracket
18, the first connection portion and the second connection portion
are not offset from each other in the seat width direction. On the
other hand, regarding the weak portion 19A of the second coupling
bracket 19, a second connection portion with a bolt fastening hole
19D side is, in the seat width direction, positioned inward of the
seat with respect to a first connection portion with a shaft
through-hole 19B side. That is, at the second coupling bracket 19,
the first connection portion and the second connection portion are
offset from each other in the seat width direction. Moreover, at
the first coupling bracket 18, no weak portion is provided between
the shaft through-hole 18B and the bolt fastening hole 18C. On the
other hand, at the second coupling bracket 19, the weak portion 19E
is provided between the shaft through-hole 19B and the bolt
fastening hole 19C. As described above, the weak portion is
provided unsymmetrically between the first coupling bracket 18 and
the second coupling bracket 19, and therefore, ease of deformation
upon load input to the seat frame 1 is differentiated.
[0071] As illustrated in FIG. 1, a height adjustment unit 41 is
provided at the left cushion side frame 22A, and a similar
component is not provided at the right cushion side frame 22B.
Thus, a greater load is, upon rear collision, input to the first
coupling bracket 18 coupled to the left cushion side frame 22A as
compared to the second coupling bracket 19 coupled to the right
cushion side frame 22B. Meanwhile, at the seat frame 1, the weak
portion is provided unsymmetrically between the first coupling
bracket 18 and the second coupling bracket 19 as described above,
and the second coupling bracket 19 is configured more easily
deformable than the first coupling bracket 18. Thus, deformation of
the first coupling bracket 18 and the second coupling bracket 19
can be adjusted to the same level.
[0072] Configuration of Lower Frame 13
[0073] Next, a configuration of the lower frame 13 is described
with reference to FIGS. 7 to 11. FIG. 7 is a front view of the seat
frame 1, and is an enlarged partial view of the periphery of the
lower frame 13. FIG. 8 is a rear view of the seat frame 1, and is
an enlarged partial view of the periphery of the lower frame 13.
FIG. 9 is an IX-IX sectional view of FIG. 7, and FIG. 10 is an X-X
sectional view of FIG. 7. FIG. 11 is a view from an arrow of a view
point XI of FIG. 7, and is an enlarged partial view of the lower
frame 13.
[0074] As illustrated in FIGS. 7 to 11, the lower frame 13 includes
a rear wall portion 13A forming a seat rear portion and having a
J-shaped section, and the front wall portion 13B formed
continuously to a front end of the rear wall portion 13A and
forming a seat front portion.
[0075] Configuration of Front Wall Portion 13B of Lower Frame
13
[0076] First, a configuration of the front wall portion 13B of the
lower frame 13 is mainly described. As illustrated in FIGS. 7 and
9, the front wall portion 13B is a portion formed in such a manner
that a seat width portion facing the support portion 15A is
extended upward of the front end of the rear wall portion 13A. As
illustrated in FIG. 7, the wire 15B attached, at a lower end
thereof, to three clips 50 is attached to the support portion 15A.
Moreover, attachment portions 51 as through-holes in which the
clips 50 are to be fitted are formed at three spots at the front
wall portion 13B. As illustrated in FIG. 7, the attachment portions
51 are provided apart from the support portion 15A below the
support portion 15A. Moreover, the attachment portions 51 are
provided inward of ends of the support portion 15A in the
right-to-left direction. The clips 50 attached to the wire 15B are
fitted in the attachment portions 51 of the front wall portion 13B,
and in this manner, the wire 15B is fixed to the front wall portion
13B.
[0077] As illustrated in FIG. 7, an upper reinforcement portion
60A, an upper reinforcement portion 60B, and an upper reinforcement
portion 60C extending in the seat width direction are formed above
the attachment portion 51 of each clip 50 at the front wall portion
13B. As illustrated in FIG. 7, the upper reinforcement portion 60A,
the upper reinforcement portion 60B, and the upper reinforcement
portion 60C are formed on the substantially same horizontal plane.
The upper reinforcement portion 60A is provided on the left side,
the upper reinforcement portion 60B is provided at the center, and
the upper reinforcement portion 60C is provided on the right side.
Note that the upper reinforcement portion 60A, the upper
reinforcement portion 60B, and the upper reinforcement portion 60C
are formed as bead portions formed in such a manner that part of
the front wall portion 13B is recessed backward of the seat by
pressing.
[0078] As illustrated in FIG. 7, the upper reinforcement portion
60A, the upper reinforcement portion 60B, and the upper
reinforcement portion 60C are formed in shapes along an upper edge
of the front wall portion 13B. That is, the upper edge of the front
wall portion 13B is in a linear shape at the center and in an arc
shape at right and left end portions. Accordingly, a left end
portion of the upper reinforcement portion 60A is formed in an arc
shape, and other portions of the upper reinforcement portion 60A
are formed in a linear shape. The upper reinforcement portion 60B
is formed in a linear shape. A right end portion of the upper
reinforcement portion 60C is formed in an arc shape, and other
portions of the upper reinforcement portion 60C are formed in a
linear shape. The position of the left end portion of the upper
reinforcement portion 60A is on the outside of the opposing
attachment portion 51 in the seat width direction. Similarly, the
position of the right end portion of the upper reinforcement
portion 60C is on the outside of the opposing attachment portion 51
in the seat width direction.
[0079] As illustrated in FIG. 7, a lower reinforcement portion 61A
and a lower reinforcement portion 61B apart from each other are
formed below the attachment portion 51 facing the upper
reinforcement portion 60A at a boundary portion between the front
wall portion 13B and the rear wall portion 13A. The lower
reinforcement portion 61A and the lower reinforcement portion 61B
are formed as bead portions formed in such a manner that the
boundary portion between the front wall portion 13B and the rear
wall portion 13A is recessed backward of the seat by pressing. As
illustrated in FIG. 7, the attachment portion 51 facing the upper
reinforcement portion 60A is, in the seat upper-to-lower direction,
provided between the upper reinforcement portion 60A and each of
the lower reinforcement portion 61A and the lower reinforcement
portion 61B. The position of the left end portion of the upper
reinforcement portion 60A is on the outside of the lower
reinforcement portion 61A in the seat width direction. Moreover,
the position of a right end portion of the upper reinforcement
portion 60A is on the outside of the lower reinforcement portion
61B in the seat width direction. That is, the lower reinforcement
portion 61A and the lower reinforcement portion 61B are, in the
seat width direction, formed inward of the upper reinforcement
portion 60A provided above the lower reinforcement portion 61A and
the lower reinforcement portion 61B. Moreover, a spacing between
the lower reinforcement portion 61A and the lower reinforcement
portion 61B is shorter than the length of the upper reinforcement
portion 60A in the width direction.
[0080] As illustrated in FIG. 7, a lower reinforcement portion 61C
and a lower reinforcement portion 61D apart from each other are
formed below the attachment portion 51 facing the upper
reinforcement portion 60B at the boundary portion between the front
wall portion 13B and the rear wall portion 13A. The lower
reinforcement portion 61C and the lower reinforcement portion 61D
are formed as bead portions formed in such a manner that the
boundary portion between the front wall portion 13B and the rear
wall portion 13A is recessed backward of the seat by pressing. As
illustrated in FIG. 7, the attachment portion 51 facing the upper
reinforcement portion 60B is, in the seat upper-to-lower direction,
provided between the upper reinforcement portion 60B and each of
the lower reinforcement portion 61C and the lower reinforcement
portion 61D. Moreover, the attachment portion 51 facing the upper
reinforcement portion 60B is, in the seat width direction, provided
between the lower reinforcement portion 61C and the lower
reinforcement portion 61D. The position of a left end portion of
the upper reinforcement portion 60B is on the outside of the lower
reinforcement portion 61C in the seat width direction. Moreover,
the position of a right end portion of the upper reinforcement
portion 60B is on the outside of the lower reinforcement portion
61D in the seat width direction. That is, the lower reinforcement
portion 61C and the lower reinforcement portion 61D are, in the
seat width direction, formed inside the upper reinforcement portion
60B provided above the lower reinforcement portion 61C and the
lower reinforcement portion 61D. Moreover, a spacing between the
lower reinforcement portion 61C and the lower reinforcement portion
61D is shorter than the length of the upper reinforcement portion
60B in the width direction.
[0081] As illustrated in FIG. 7, a lower reinforcement portion 61E
and a lower reinforcement portion 61F apart from each other are
formed below the attachment portion 51 facing the upper
reinforcement portion 60C at the boundary portion between the front
wall portion 13B and the rear wall portion 13A. The lower
reinforcement portion 61E and the lower reinforcement portion 61F
are formed as bead portions formed in such a manner that the
boundary portion between the front wall portion 13B and the rear
wall portion 13A is recessed backward of the seat by pressing. As
illustrated in FIG. 7, the attachment portion 51 facing the upper
reinforcement portion 60C is, in the seat upper-to-lower direction,
provided between the upper reinforcement portion 60C and each of
the lower reinforcement portion 61E and the lower reinforcement
portion 61F. The position of a left end portion of the upper
reinforcement portion 60C is on the outside of the lower
reinforcement portion 61E in the seat width direction. Moreover,
the position of the right end portion of the upper reinforcement
portion 60C is on the outside of the lower reinforcement portion
61F in the seat width direction. That is, the lower reinforcement
portion 61E and the lower reinforcement portion 61F are, in the
seat width direction, formed inside the upper reinforcement portion
60C provided above the lower reinforcement portion 61E and the
lower reinforcement portion 61F. Moreover, a spacing between the
lower reinforcement portion 61E and the lower reinforcement portion
61F is shorter than the length of the upper reinforcement portion
60C in the width direction.
[0082] As illustrated in FIG. 7, a spacing between the upper
reinforcement portion 60A and the upper reinforcement portion 60B
adjacent to each other on the upper side is shorter than a spacing
between the lower reinforcement portion 61B and the lower
reinforcement portion 61C adjacent to each other on the lower side.
Similarly, a spacing between the upper reinforcement portion 60B
and the upper reinforcement portion 60C adjacent to each other on
the upper side is shorter than a spacing between the lower
reinforcement portion 61D and the lower reinforcement portion 61E
adjacent to each other on the lower side.
[0083] For example, in the case of attaching the pressure receiving
member 15 to a front surface of the rear wall portion 13A, the
process of attaching the pressure receiving member 15 is not easy
because the rotary shaft 16 is provided between the rear wall
portion 13A and the front wall portion 13B and there is not
sufficient space. Meanwhile, at the seat frame 1, the attachment
portions 51 for attaching the wire 15B of the pressure receiving
member 15 are provided at the front wall portion 13B of the lower
frame 13, and therefore, the rotary shaft 16 and an engineer's hand
(not shown) do not contact each other. Thus, workability in
attachment of the pressure receiving member 15 can be improved.
[0084] Configuration of Rear Wall Portion 13A of Lower Frame 13
[0085] Next, a configuration of the rear wall portion 13A of the
lower frame 13 is mainly described. As illustrated in FIG. 9, an
upper end of the rear wall portion 13A is positioned above an upper
end of the front wall portion 13B. Moreover, a lower end of the
support portion 15A is positioned above the upper end of the front
wall portion 13B and below the upper end of the rear wall portion
13A. Moreover, as illustrated in FIG. 9, the front wall portion 13B
is provided substantially parallel to the support portion 15A. Note
that the support portion 15A is substantially parallel to the torso
line T, and in other words, the front wall portion 13B is provided
substantially parallel to the torso line T.
[0086] As illustrated in FIG. 8, upwardly-protruding portions 75
protruding upward are each provided at both upper outer portions of
the rear wall portion 13A in the seat width direction. The
upwardly-protruding portion 75 is formed in a shape along the side
frame 12, and a reinforcement portion 74 is formed at a position
facing the rear reinforcement portion 30D of the side frame 12.
Note that the reinforcement portion 74 is formed as a bead portion
recessed forward of the seat, and is in a shape engageable with the
rear reinforcement portion 30D. Note that both side portions of the
rear wall portion 13A in the seat width direction are joined to the
side frames 12 by welding.
[0087] According to the seat frame 1 of the present embodiment as
described above, the first reinforcement portion 30A, the second
reinforcement portion 30B, and the third reinforcement portion 30C
are provided at the side frame side portion 12A of the side frame
12, and therefore, the stiffness of the side frame 12 can be
improved. The first reinforcement portion 30A, the second
reinforcement portion 30B, and the third reinforcement portion 30C
described herein are different from each other in an extension
direction, and therefore, the stiffness against load input from
various directions can be improved.
[0088] Moreover, according to the seat frame 1, the attachment
portions 51 of the pressure receiving member 15 are provided at the
front wall portion 13B of the lower frame 13, and therefore, the
workability in attachment of the pressure receiving member 15 can
be improved. Moreover, the reinforcement portions are provided on
the upper and lower sides of the attachment portions 51 at the
front wall portion 13B, and therefore, the stiffness of the
periphery of the attachment portions 51 can be improved.
[0089] Variations
[0090] The present disclosure is not limited to the above-described
embodiment. Hereinafter, variations of the reinforcement portions
(bead shapes) formed at the side frame side portion 12A of the side
frame 12 are described with reference to FIGS. 12A to 12D. FIGS.
12A to 12D each illustrate outer side views of the side frames 12
according to the variations.
[0091] First, the side frame 12 according to a first variation is
described. As illustrated in FIG. 12A, the side frame 12 according
to the first variation includes a reinforcement portion 80A, a
reinforcement portion 80B, a reinforcement portion 80C, a
reinforcement portion 80D, and a reinforcement portion 80E. Each of
the reinforcement portion 80A, the reinforcement portion 80B, the
reinforcement portion 80C, the reinforcement portion 80D, and the
reinforcement portion 80E described herein is formed as a bead
portion formed in such a manner that the side frame side portion
12A is recessed inward of the seat by pressing. The reinforcement
portion 80A is provided along the rear edge 12C of the side frame
side portion 12A. The reinforcement portion 80B is provided to
extend in the seat front-to-rear direction between the airbag
attachment hole 31A and the airbag attachment hole 31B. The
reinforcement portion 80C is provided to extend in the seat
front-to-rear direction between the airbag attachment hole 31A and
the airbag attachment hole 31C. The reinforcement portion 80D is
provided to extend in the seat front-to-rear direction below the
airbag attachment hole 31C. The reinforcement portion 80E is
provided along the front edge of the side frame side portion 12A
above the airbag attachment hole 31B.
[0092] As illustrated in FIG. 12A, any of the reinforcement portion
80A, the reinforcement portion 80B, the reinforcement portion 80C,
the reinforcement portion 80D, and the reinforcement portion 80E is
not necessarily coupled to other reinforcement portions, and may be
provided as independent bead portions. Moreover, the reinforcement
portion 80A, the reinforcement portion 80B, the reinforcement
portion 80C, the reinforcement portion 80D, and the reinforcement
portion 80E may be different from each other in their respective
extension directions.
[0093] Next, the side frame 12 according to a second variation is
described. As illustrated in FIG. 12B, the side frame 12 according
to the second variation includes a reinforcement portion 81A, a
reinforcement portion 81B, and a reinforcement portion 81C. Each of
the reinforcement portion 81A, the reinforcement portion 81B, and
the reinforcement portion 81C described herein is formed as a bead
portion formed in such a manner that the side frame side portion
12A is recessed inward of the seat by pressing. The reinforcement
portion 81A is provided along the rear edge 12C of the side frame
side portion 12A. Note that a lower end of the reinforcement
portion 81A is curved inward of the seat. The reinforcement portion
81B is provided to extend in the seat front-to-rear direction
between the airbag attachment hole 31A and the airbag attachment
hole 31B. Moreover, a rear end of the reinforcement portion 81B is
coupled to the reinforcement portion 81A. The reinforcement portion
81C is provided along the front edge of the side frame side portion
12A above the airbag attachment hole 31B.
[0094] Next, the side frame 12 according to a third variation is
described. As illustrated in FIG. 12C, the side frame 12 according
to the third variation includes a reinforcement portion 82A, a
reinforcement portion 82B, a reinforcement portion 82C, and a
reinforcement portion 82D. Each of the reinforcement portion 82A,
the reinforcement portion 82B, the reinforcement portion 82C, and
the reinforcement portion 82D described herein is formed as a bead
portion formed in such a manner that the side frame side portion
12A is recessed inward of the seat by pressing. The reinforcement
portion 82A is provided along the rear edge 12C of the side frame
side portion 12A. Note that a lower end of the reinforcement
portion 82A is bent inward of the seat. The reinforcement portion
82B is provided to extend in the seat front-to-rear direction
between the airbag attachment hole 31A and the airbag attachment
hole 31B. Moreover, a rear end of the reinforcement portion 82B is
coupled to the reinforcement portion 82A. The reinforcement portion
82C is provided to extend in the seat front-to-rear direction from
a bent portion of the reinforcement portion 82A to the airbag
attachment hole 31C. Moreover, a rear end of the reinforcement
portion 82C is coupled to the reinforcement portion 82A. The
reinforcement portion 82D is provided along the front edge of the
side frame side portion 12A above the airbag attachment hole
31B.
[0095] Next, the side frame 12 according to a fourth variation is
described. As illustrated in FIG. 12D, the side frame 12 according
to the fourth variation includes a reinforcement portion 83A, a
reinforcement portion 83B, and a reinforcement portion 83C. Each of
the reinforcement portion 83A, the reinforcement portion 83B, and
the reinforcement portion 83C described herein is formed as a bead
portion formed in such a manner that the side frame side portion
12A is recessed inward of the seat by pressing. The reinforcement
portion 83A is provided along the rear edge 12C of the side frame
side portion 12A. The reinforcement portion 83B is formed in an
annular ring shape, and at a rear end portion thereof, is coupled
to the reinforcement portion 83A. Moreover, the reinforcement
portion 83B is formed among the airbag attachment hole 31A, the
airbag attachment hole 31B, and the airbag attachment hole 31C, and
includes the airbag attachment hole 31A. The reinforcement portion
83C is provided along the front edge of the side frame side portion
12A above the airbag attachment hole 31B.
Second Embodiment
[0096] Next, a seat frame 1 according to a second embodiment is
described with reference to FIGS. 13 to 18. In the seat frame 1
according to the second embodiment, a cross member 100 bridged at
an upper frame 11 is different from the cross member 14 illustrated
in FIG. 1 as described below, but other points are common to the
first and second embodiments. Thus, a configuration of the cross
member 100 is described below.
[0097] As illustrated in FIG. 13, the cross member 100 extending in
the seat width direction is bridged between right and left bent
portions of the upper frame 11. Right and left end portions 103 of
the cross member 100 are welded and fixed to the right and left
bent portions of the upper frame 11.
[0098] At an upper end of the cross member 100, a first recessed
portion 101 recessed downward is formed between the right and left
end portions 103. Note that in the case of providing the first
recessed portion 101 at a lower end of the cross member 100, the
first recessed portion 101 is in a shape recessed upward between
the right and left end portions 103.
[0099] As illustrated in FIGS. 13 and 14, the first recessed
portion 101 is provided at a center portion of the cross member 100
in the seat width direction. Note that the center portion of the
cross member 100 in the seat width direction is between right and
left headrest attachment portions 17.
[0100] The cross member 100 has wide portions 105 on the right and
left sides of the first recessed portion 101 in the seat width
direction. The wide portion 105 is configured such that the width
thereof in the upper-to-lower direction is greater than that of the
first recessed portion 101. Note that the cross member 100 is in a
symmetrical shape with respect to the first recessed portion 101 in
the right-to-left direction. That is, the shapes of the right and
left wide portions 105 are symmetrical in the right-to-left
direction.
[0101] As illustrated in FIG. 14, the wide portion 105 is curved to
protrude backward of the seat. Specifically, an outer portion of
the wide portion 105 in the seat width direction is curved in a
shape protruding backward of the seat.
[0102] As illustrated in FIGS. 13 to 17, a reinforcement portion
104 is formed at a center portion of the cross member 100 in the
upper-to-lower direction. The reinforcement portion 104 is formed
across the first recessed portion 101 and the right and left wide
portions 105. The reinforcement portion 104 protrudes forward of
the seat. Specifically, the reinforcement portion 104 is configured
as a bead portion formed in such a manner that part of the cross
member 100 is projected forward of the seat by pressing, for
example. Thus, the stiffness of the cross member 100 is improved.
Note that as illustrated in FIG. 13, the reinforcement portion 104
of the wide portion 105 is wider in the upper-to-lower direction
than the reinforcement portion 104 of the first recessed portion
101.
[0103] As illustrated in FIG. 13, a first through-hole 106 and a
second through-hole 107 are formed at the reinforcement portion 104
at the wide portion 105. The first through-hole 106 is a
rectangular through-hole, and the second through-hole 107 is a
circular through-hole. As described above, the shapes of the
through-holes formed at the reinforcement portion 104 of the wide
portion 105 are not specifically limited. Note that the
through-holes such as the first through-hole 106 and the second
through-hole 107 are formed at the cross member 100, and therefore,
the weight of the cross member 100 can be reduced.
[0104] As illustrated in FIGS. 13 to 17, a first flange portion
108A is formed at an upper end portion of the cross member 100. The
first flange portion 108A is a portion formed in such a manner that
the upper end portion of the cross member 100 is bent forward of
the seat. Moreover, the first flange portion 108A is formed across
the first recessed portion 101 and the right and left wide portions
105. The first flange portion 108A is formed at a position facing
the first recessed portion 101 in the upper-to-lower direction.
That is, the first flange portion 108A is formed above the first
recessed portion 101.
[0105] A second recessed portion 102A recessed downward of the seat
is formed at the first flange portion 108A of the wide portion 105.
In other words, the second recessed portion 102A is a recessed
portion provided at the upper end of the cross member 100 and
formed differently from the first recessed portion 101. A portion
below the second recessed portion 102A protrudes forward of the
seat.
[0106] As illustrated in FIGS. 13 to 17, a second flange portion
108B is formed at a lower end portion of the cross member 100. The
second flange portion 108B is a portion formed in such a manner
that the lower end portion of the cross member 100 is bent forward
of the seat. Moreover, the second flange portion 108B is formed
across the first recessed portion 101 and the right and left wide
portions 105.
[0107] A second recessed portion 102B recessed upward of the seat
is formed at the second flange portion 108B of the wide portion
105. In other words, the second recessed portion 102B is a recessed
portion provided at the lower end of the cross member 100 and
formed differently from the first recessed portion 101. A portion
above the second recessed portion 102B protrudes forward of the
seat.
[0108] The second recessed portion 102A, the first through-hole
106, and the second recessed portion 102B are arranged at positions
overlapping with each other in the upper-to-lower direction.
[0109] Note that the above-described cross member 100 has both of
the first flange portion 108A and the second flange portion 108B,
but may have either one of the first flange portion 108A or the
second flange portion 108B.
[0110] An example of attachment of a member to the cross member 100
of the seat frame 1 according to the second embodiment is described
with reference to FIG. 18. As illustrated in FIG. 18, a blower 92
is attached to above the first recessed portion 101 of the cross
member 100. Specifically, an attachment member 90 is fixed between
the upper frame 11 and the first recessed portion 101 of the cross
member 100. For example, the attachment member 90 is a metal
plate-shaped plate. The attachment member 90 is welded to the upper
frame 11 and the first recessed portion 101 of the cross member 100
at welding portions 91.
[0111] Using fasteners 93 such as screws, the blower 92 is fixed to
the attachment member 90. Thus, the blower 92 can be arranged in a
space above the first recessed portion 101 of the cross member 100.
As described above, the first recessed portion 101 is in a shape
recessed downward, and therefore, a greater space than the wide
portion 105 is formed above the first recessed portion 101 of the
cross member 100. Thus, a relatively-large member such as the
blower 92 can be arranged above the first recessed portion 101.
[0112] Stop portions 95 of cover portions 94 can be attached to the
second recessed portion 102A and the second recessed portion 102B
of the cross member 100. For example, in a case where the stop
portion 95 is a hook, the hook is stopped at a protruding portion
of the second recessed portion 102A (or the second recessed portion
102B), and in this manner, the stop portion 95 can be attached to
the second recessed portion 102A (or the second recessed portion
102B). As described above, various members can be attached to the
cross member 100.
[0113] Advantageous Effects of Seat Frame 1
[0114] The seat frame 1 includes the side frames 12 arranged on the
right and left sides, and has the first reinforcement portion 30A
extending in the upper-to-lower direction along the rear edge of
the side frame side portion 12A positioned outside in the seat
width direction at the side frame 12. According to the seat frame
1, the rear edge of the side frame side portion 12A is reinforced
so that the stiffness of the side frame 12 can be improved.
[0115] Moreover, in the seat frame 1, the first reinforcement
portion 30A is provided at least at the wide portion having the
greatest width in the seat front-to-rear direction at the side
frame side portion 12A. With this configuration, the wide portion
of the side frame side portion 12A is reinforced so that the
stiffness of the side frame 12 can be improved.
[0116] Further, the seat frame 1 has the second reinforcement
portion 30B provided at the side frame side portion 12A and
extending in the seat front-to-rear direction, and the second
reinforcement portion 30B is provided within an upper-to-lower area
where the first reinforcement portion 30A extends. With this
configuration, the side frame side portion 12A is reinforced in the
upper-to-lower direction and the front-to-rear direction, and
therefore, the stiffness of the side frame 12 can be improved.
[0117] In addition, in the seat frame 1, the first reinforcement
portion 30A and the second reinforcement portion 30B are coupled to
each other. With this configuration, the first reinforcement
portion 30A and the second reinforcement portion 30B can be
integrally formed. Thus, formation of the reinforcement portions is
facilitated.
[0118] Moreover, the seat frame 1 has the third reinforcement
portion 30C provided at the side frame side portion 12A and
extending in the front-to-rear direction at a position apart in a
downward direction from the second reinforcement portion 30B. With
this configuration, the stiffness of the side frame side portion
12A can be improved across a broad area.
[0119] Further, in the seat frame 1, the second reinforcement
portion 30B is coupled to the portion between the upper and lower
ends of the first reinforcement portion 30A, and the third
reinforcement portion 30C is coupled to the lower end of the first
reinforcement portion 30A. With this configuration, the stiffness
of the side frame side portion 12A can be improved in a balanced
manner.
[0120] In addition, in the seat frame 1, the second reinforcement
portion 30B and the third reinforcement portion 30C are different
from each other in the angle of extension with respect to the first
reinforcement portion 30A. With this configuration, the stiffness
against load input from various directions can be improved.
[0121] Moreover, in the seat frame 1, the second reinforcement
portion 30B extends in the direction substantially perpendicular to
the torso line T. With this configuration, stiffness on a high load
input side can be improved.
[0122] Further, in the seat frame 1, the second reinforcement
portion 30B extends between the multiple through-holes formed at
the side frame side portion 12A. With this configuration, the
stiffness of the periphery of the through-holes can be
improved.
[0123] In addition, in the seat frame 1, the multiple through-holes
include the airbag attachment hole 31A for attaching the airbag,
and the second reinforcement portion 30B and the third
reinforcement portion 30C are provided at the positions sandwiching
the airbag attachment hole 31A in the upper-to-lower direction.
With this configuration, the stiffness of a portion of the side
frame 12 attached to the airbag can be improved.
[0124] Moreover, in the seat frame 1, the first reinforcement
portion 30A is at the position facing at least one of the multiple
through-holes in the upper-to-lower direction. With this
configuration, the stiffness of the periphery of the through-holes
of the side frame 12 can be improved.
[0125] Further, the seat frame 1 includes the upper frame 11
coupling the upper portions of the side frames 12, and the side
frame side portion 12A is joined to the upper frame side portion
11A positioned outside in the seat width direction at the upper
frame 11. Moreover, the first reinforcement portion 30A is provided
at the position at which the side frame side portion 12A and the
upper frame side portion 11A overlap with each other. With this
configuration, the stiffness of the joint portion between the side
frame 12 and the upper frame 11 can be improved.
[0126] In addition, the seat frame 1 includes the upper frame 11
forming an upper portion of the seat back frame 10, and the cross
member 100 bridged at the upper frame 11. The cross member 100 has
the right and left end portions 103, which are fixed to the upper
frame 11, in the seat width direction, and the first recessed
portion 101 recessed upward or downward between the right and left
end portions 103. According to the seat frame 1, the weight of the
cross member 100 can be reduced as compared to the case of
providing no recessed portion at the cross member 100. With this
configuration, the weight of the cross member 100 bridged between
the right and left sides of the seat frame 1 can be reduced.
[0127] Moreover, in the seat frame 1, the first recessed portion
101 is provided at the center portion of the cross member 100 in
the seat width direction. As described above, the first recessed
portion is provided at a position facing the occupant, and
therefore, a feeling of sitting on the seat can be improved.
Further, according to the seat frame 1, the space where a member
such as the blower 92 is arranged can be provided in the vicinity
of the center portion of the cross member 100.
[0128] In addition, in the seat frame 1, the cross member 100 has
the reinforcement portion 104 formed at the first recessed portion
101. With this configuration, lowering of the stiffness of the
vicinity of the first recessed portion 101 of the cross member 100
can be suppressed.
[0129] Moreover, in the seat frame 1, the cross member 100 has the
wide portions 105 provided on the right and left sides of the first
recessed portion 101 in the seat width direction, and the
reinforcement portion 104 is formed across the first recessed
portion 101 and both of the wide portions 105. With this
configuration, the stiffness of the cross member 100 can be
improved.
[0130] Further, in the seat frame 1, the cross member 100 is
provided with the through-holes (the first through-hole 106, the
second through-hole 107). With this configuration, the weight of
the cross member 100 can be further reduced.
[0131] In addition, in the seat frame 1, the through-holes (the
first through-hole 106, the second through-hole 107) are formed at
the wide portion 105. The through-holes (the first through-hole
106, the second through-hole 107) are formed at the wide portion
105 as described above, and therefore, larger through-holes can be
formed as compared to the case of forming the through-holes at the
first recessed portion 101. With this configuration, the weight of
the cross member 100 can be further reduced.
[0132] Moreover, in the seat frame 1, the through-holes (the first
through-hole 106, the second through-hole 107) are formed at the
reinforcement portion 104 of the wide portion 105. With this
configuration, the weight of the cross member 100 can be reduced,
and lowering of the stiffness of the cross member 100 can be also
suppressed.
[0133] Further, in the seat frame 1, at least part of the wide
portion 105 is curved to protrude backward. With this
configuration, the stiffness of the cross member 100 can be
improved. Moreover, the cross member 100 can be formed in a shape
matching the body shape of the occupant, and therefore, the feeling
of sitting on the seat can be improved.
[0134] In addition, the seat frame 1 has the second recessed
portion (the second recessed portion 102A, the second recessed
portion 102B) different from the first recessed portion 101, the
second recessed portion being provided at least at one of the upper
or lower end of the cross member 100. With this configuration, the
weight of the cross member 100 can be further reduced. Moreover, a
member such as the stop portion 95 of the cover portion 94 can be
stopped at the second recessed portion (the second recessed portion
102A, the second recessed portion 102B). Thus, the number of
components forming the seat can be reduced. Consequently, the
weight of the seat can be reduced.
[0135] Further, the seat frame 1 has the flange portion (the first
flange portion 108A, the second flange portion 108B) provided at
least at one of the upper or lower end of the cross member 100. The
flange portion (the first flange portion 108A, the second flange
portion 108B) is formed at the position facing the first recessed
portion 101 in the upper-to-lower direction. With this
configuration, the stiffness of the first recessed portion 101 can
be improved.
TABLE OF REFERENCE NUMERALS
[0136] 1: seat frame [0137] 10: seat back frame [0138] 11: upper
frame [0139] 11A: upper frame side portion [0140] 12: side frame
[0141] 12A: side frame side portion [0142] 12B: side frame rear
portion [0143] 12C: rear edge [0144] 12D: wide portion [0145] 13:
lower frame [0146] 13A: rear wall portion [0147] 13B: front wall
portion [0148] 14: cross member [0149] 14A: recessed portion [0150]
14B: end portion [0151] 15: pressure receiving member [0152] 15A:
support portion [0153] 15B: wire [0154] 15C: wire [0155] 16: rotary
shaft [0156] 17: headrest attachment portion [0157] 18: first
coupling bracket [0158] 18A: weak portion [0159] 18B: shaft
through-hole [0160] 18C: bolt fastening hole [0161] 18D: bolt
fastening hole [0162] 19: second coupling bracket [0163] 19A: weak
portion [0164] 19B: shaft through-hole [0165] 19C: bolt fastening
hole [0166] 19D: bolt fastening hole [0167] 19E: weak portion
[0168] 20: seat cushion frame [0169] 21: pan frame [0170] 22A, 22B:
cushion side frame [0171] 23: coupling pipe [0172] 24: pressure
receiving member [0173] 30A: first reinforcement portion [0174]
30B: second reinforcement portion [0175] 30C: third reinforcement
portion [0176] 30D: rear reinforcement portion [0177] 31A: airbag
attachment hole [0178] 31B: airbag attachment hole [0179] 31C:
airbag attachment hole [0180] 31D: through-hole [0181] 31E:
through-hole [0182] 31F: through-hole [0183] 40: reclining unit
[0184] 41: height adjustment unit [0185] 50: clip [0186] 51:
attachment portion [0187] 52: welding portion [0188] 60A: upper
reinforcement portion [0189] 60B: upper reinforcement portion
[0190] 60C: upper reinforcement portion [0191] 61A: lower
reinforcement portion [0192] 61B: lower reinforcement portion
[0193] 61C: lower reinforcement portion [0194] 61D: lower
reinforcement portion [0195] 61E: lower reinforcement portion
[0196] 61F: lower reinforcement portion [0197] 74: reinforcement
portion [0198] 75: upwardly-protruding portion [0199] 80A:
reinforcement portion [0200] 80B: reinforcement portion [0201] 80C:
reinforcement portion [0202] 80D: reinforcement portion [0203] 80E:
reinforcement portion [0204] 81A: reinforcement portion [0205] 81B:
reinforcement portion [0206] 81C: reinforcement portion [0207] 82A:
reinforcement portion [0208] 82B: reinforcement portion [0209] 82C:
reinforcement portion [0210] 82D: reinforcement portion [0211] 83A:
reinforcement portion [0212] 83B: reinforcement portion [0213] 83C:
reinforcement portion [0214] 90: attachment member [0215] 91:
welding portion [0216] 92: blower [0217] 93: fastener [0218] 94:
cover portion [0219] 95: stop portion [0220] 100: cross member
[0221] 101: first recessed portion [0222] 102A: second recessed
portion [0223] 102B: second recessed portion [0224] 103: end
portion [0225] 104: reinforcement portion [0226] 105: wide portion
[0227] 106: first through-hole [0228] 107: second through-hole
[0229] 108A: first flange portion (flange portion) [0230] 108B:
second flange portion (flange portion) [0231] T: torso line [0232]
V: vertical line
* * * * *