U.S. patent application number 15/384919 was filed with the patent office on 2017-07-27 for spinning reel for fishing.
The applicant listed for this patent is Shimano Inc.. Invention is credited to Satoshi IKEBUKURO, Koji OCHIAI, Kei SAITO, Takuji TAKAMATSU.
Application Number | 20170208787 15/384919 |
Document ID | / |
Family ID | 57838262 |
Filed Date | 2017-07-27 |
United States Patent
Application |
20170208787 |
Kind Code |
A1 |
OCHIAI; Koji ; et
al. |
July 27, 2017 |
SPINNING REEL FOR FISHING
Abstract
A spinning reel for fishing includes a rotor, a fishing line
guiding mechanism, and a bail reversing mechanism. The rotor has a
cylindrical portion, and first and second rotor arms disposed in
opposed positions on the cylindrical portion. The fishing line
guiding mechanism has a line roller to guide a fishing line, a
bail, first and second bail support members supporting first and
second ends of the bail, the first bail support member coupled to
the first rotor arm, and the second bail support member coupled to
the second rotor arm. The bail reversing mechanism inverts the
fishing line guiding mechanism to line casting or line winding
positions. The line roller is disposed on the first bail support
member and the bail reversing mechanism is disposed inside the
second rotor arm. The first rotor arm includes two support legs
extending forwardly from an outer peripheral portion of the
cylindrical portion.
Inventors: |
OCHIAI; Koji; (Osaka,
JP) ; TAKAMATSU; Takuji; (Osaka, JP) ;
IKEBUKURO; Satoshi; (Osaka, JP) ; SAITO; Kei;
(Osaka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Shimano Inc. |
Osaka |
|
JP |
|
|
Family ID: |
57838262 |
Appl. No.: |
15/384919 |
Filed: |
December 20, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A01K 89/01083 20150501;
A01K 89/01082 20150501 |
International
Class: |
A01K 89/01 20060101
A01K089/01 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 25, 2016 |
JP |
2016-011942 |
Claims
1. A spinning reel for fishing, comprising: a rotor having a
cylindrical portion, and a first rotor arm and a second rotor arm
disposed in mutually opposed positions on the cylindrical portion;
a fishing line guiding mechanism having a line roller configured to
guide a fishing line, a bail, a first bad support member supporting
a first end of the bail, and a second bail support member
supporting a second end of the bail, the first bail support member
being coupled to the first rotor arm, and the second bad support
member being coupled to the second rotor arm; and a bail reversing
mechanism configured to invert the fishing line guiding mechanism
to a line casting position or a line winding position, the line
roller being disposed on the first bad support member and the bad
reversing mechanism being disposed inside the second rotor arm, and
the first rotor arm comprising; two support legs that extend
forwardly from an outer peripheral portion of the cylindrical
portion.
2. The spinning reel for fishing recited in claim 1, further
comprising a ribbed reinforcement portion extending from a side of
at least one support leg to the outer peripheral portion of the
cylindrical portion.
3. The spinning reel for fishing recited in claim 1, wherein the
bail reversing mechanism comprises a return lever configured to
return the second bail support member to the line winding position,
and a return unit abutting a rear end portion of the return lever
and configured to move the return lever, is disposed at a position
on a front flange portion of a reel body that faces a rear end
portion of the cylindrical portion to which a rod support portion
extends.
4. The spinning reel for fishing recited in claim 3, wherein a
biasing member abutting a front end of the return lever and
configured to bias the return lever to the line winding position is
disposed on the second bail support member.
5. The spinning reel for fishing recited in claim 1, wherein the
bail reversing mechanism comprises a toggle spring and a guide rod
configured to guide the toggle spring, and an insulating member is
disposed in an engagement hole of the second bail support member,
and engages one end portion of the guide rod to insulate a space
between the guide rod and the engagement hole.
6. The spinning reel for fishing recited in claim 1, further
comprising a rotor balance adjustment unit disposed on the first
rotor arm on the outer peripheral portion of the cylindrical
portion.
7. The spinning reel for fishing recited in claim 1, further
comprising a thick-walled reinforcement portion on an inner
peripheral portion of the cylindrical portion in a position at
which the first rotor arm is disposed, the thick-walled portion
being thicker than a surrounding portion.
8. The spinning reel for fishing recited in claim 1, wherein an
inclined reinforcement portion extending inclined with respect to a
cylinder axis direction of the cylindrical portion is disposed on a
side surface of the cylindrical portion.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority based on Japanese Patent
Application No. 2016-011942, filed in the Japan Patent Office on
Jan. 25, 2016, the contents of each of which are hereby
incorporated herein by reference.
BACKGROUND
[0002] Field of the Invention
[0003] The present invention relates to a spinning; reel for
fishing, in particular to a spinning reel for fishing comprising a
reduced weight rotor.
[0004] Background Information
[0005] A conventional spinning reel for fishing can include a
spool, a rotor that comprises a pair of rotor arms (e.g., a first
rotor arm and a second rotor arm), and a fishing line guiding
mechanism that is pivotably mounted to the distal ends of the pair
of rotor arms (for example, Japanese Published Unexamined
Application No. 2006-101704). The fishing line guiding mechanism is
a mechanism for guiding the fishing line onto the spool. This
fishing line guiding mechanism comprises a bail, a pair of bail
support members that support the two ends of the bail, and a line
roller.
[0006] When winding a fishing line onto a spool, winding is carried
out via a line roller by rotating the rotor, therefore, a large
load is applied to the line roller. in order to support this load,
it is necessary for the first rotor arm, on which the line roller
is disposed, to have sufficient strength. Increasing the strength
of the first rotor arm often causes the weight of the first rotor
arm to increase.
[0007] Further, an inverting mechanism for inverting the fishing
line guiding mechanism between a line casting position and a line
winding position is attached on the first rotor arm side. This
structure is also a cause of increased weight of the first rotor
arm.
[0008] it is necessary for a rotor, which rotates the first rotor
arm and the second rotor arm at high speed, to achieve good
rotational balance. Accordingly, when the weight of the first rotor
arm is greater than that of the second rotor arm, the weight of the
second rotor arm is increased in order to achieve a balance. As a
result, the overall weight of the rotor is further increased.
[0009] There is prior art in which an inverting mechanism for
inverting the fishing line guiding mechanism is disposed on the
rotor arm side on which the line roller is not disposed, in order
to reduce the weight of the rotor arm as much as possible (for
example, Japanese Published Unexamined Application No.
2003-274817).
SUMMARY
[0010] According to the technology disclosed in Japanese Published
Unexamined Application No. 2003-274817, the thickness of the rotor
arm can be reduced by providing a bulging portion that protrudes to
the spool side of a rotor arm on the side to which an inverting
mechanism is disposed, disposing an inverting shaft in the bulging
portion, and changing the position of the inverting shaft. Further,
the bulging portion is configured to be disposed on either one of
the pair of rotor arms.
[0011] An object of the technology disclosed in Japanese Published
Unexamined Application No. 2003-274817 is to reduce the thickness
of the rotor arm by effectively utilizing the space that is formed
between the rotor arm and the spool. However, the structure of the
rotor arm on the side from which the inverting mechanism is removed
is not reassessed.
[0012] In recent years, with the aim to further reduce the weight
of the spinning reel for fishing, a spinning reel for fishing has
been in demand in which the rotor is reduced in weight by utilizing
the benefits of moving the inverting mechanism from the rotor arm
on the side on which the line roller is disposed.
[0013] The present invention was made in order to solve the problem
described above, and an object thereof is to provide a spinning
reel for fishing having a rotor that is reduced in weight, by
moving an inverting mechanism from the rotor arm on the side on
which the line roller is disposed.
[0014] The spinning reel for fishing according to the present
invention comprises a rotor, a fishing line guiding mechanism, and
a bail reversing mechanism.
[0015] The rotor has a cylindrical portion, and a first rotor arm
and a second rotor arm disposed in mutually opposed positions on
the cylindrical portion.
[0016] The fishing line guiding mechanism has a line roller that
guides a fishing line, a bail, a first bail support member that
supports one end of the bail, and a second bail support member that
supports the other end of the bail, in which the first bail support
member is coupled to the first rotor arm, and the second bail
support member is coupled to the second rotor arm.
[0017] The bail reversing mechanism inverts the fishing line
guiding mechanism between a line casting position and a line
winding position. The line roller is disposed on the first bail
support member and the bail reversing mechanism is disposed inside
the second rotor arm. The first rotor arm comprises two support
legs that extend forwardly from the outer peripheral portion Of the
cylindrical portion.
[0018] Preferably, the support. legs comprise a ribbed
reinforcement portion that extends from the side of at least one
support leg to the outer peripheral portion of the cylindrical
portion.
[0019] Preferably, the bail reversing mechanism comprises a return
lever that returns the second bail support member to the line
winding position, and a return unit that abuts the rear end portion
of the return lever and moves the return lever, is disposed at a
position of a front flange portion of the reel body that faces the
rear end portion of the cylindrical portion, to which a rod support
portion extends.
[0020] Preferably, a biasing member that abuts the front end of the
return lever and biases the return lever in the forward direction
is disposed on the second bail support member.
[0021] Preferably, the bail reversing mechanism comprises a toggle
spring and a guide rod that guides the toggle spring, and an
insulating member is disposed in an engagement hole of the second
bail support member and engages one end portion of the guide rod,
in order to insulate the space between the guide rod and the
engagement hole.
[0022] Preferably, a rotor balance adjustment unit is disposed on
the outer peripheral portion of the cylindrical portion at the
first rotor arm.
[0023] Preferably, a thick-walled reinforcement portion that is
thicker than the surroundings is disposed on the inner peripheral
portion of the cylindrical portion at a position on which the first
rotor arm is disposed.
[0024] Preferably, an inclined reinforcement portion that extends
inclined with respect to the cylinder axis direction of the
cylindrical portion is disposed on the side surface of the
cylindrical portion.
[0025] According to the present invention, it is possible to
provide a spinning reel for fishing having a rotor that is reduced
in weight, by moving the inverting mechanism from the rotor arm on
the side on which the line roller is disposed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Referring now to the attached drawings which form a part of
this original disclosure.
[0027] FIG. 1 is an overall side view of a spinning, reel for
fishing according to a first embodiment of the present
invention.
[0028] FIG. 2 is a cross-sectional view of the spinning reel for
fishing as shown in FIG. 1.
[0029] FIG. 3 is a front view of the spinning reel for fishing as
shown in FIG. 1.
[0030] FIG. 4 is a partial, enlarged view of the fishing line
guiding mechanism of the spinning reel for fishing as shown in FIG.
1.
[0031] FIG. 5A is a perspective view of a rotor comprising the
fishing line guiding mechanism of the spinning reel for fishing as
shown in FIG. 1, seen from the first rotor arm side, and FIG. 5B is
a perspective view seen from the second rotor arm side.
[0032] FIG. 6A is a side view of the rotor shown in FIGS. 5A and
5B, and FIG. 6B is a schematic cross sectional view taken along
line A-A of the rotor body portion shown in FIG. 6A.
[0033] FIG. 7 is a schematic cross sectional view taken along line
C-C in FIG. 6B.
[0034] FIG. 8 is a schematic cross sectional view taken along line
B-B in FIG. 6A.
[0035] FIG. 9A is a schematic view of the bail reversing mechanism
according to the first embodiment of the present invention in the
line winding position, and FIG. 9B is a schematic view of the bail
reversing mechanism when in the line casting position.
[0036] FIG. 10 is a partial perspective view of the bail reversing
mechanism according to the first embodiment of the present
invention.
[0037] FIG. 11 is a schematic cross sectional view taken along line
D-D in FIG. 2.
[0038] FIG. 12A is a side view of the rotor of a spinning reel for
fishing according to a second embodiment of the present invention,
and FIG. 12B is a side view seen from the opposite side.
[0039] FIG. 13A is a side view of the rotor of a spinning reel for
fishing according to a modified example of the present invention,
and FIG. 1313 is a side view seen from the opposite side.
DETAILED DESCRIPTION OF THE EMBODIMENTS
First Embodiment
[0040] The spinning reel for fishing according to the first
embodiment of the present invention will be described, with
reference to the drawings. In the following description, "front
(ward)" indicates the direction in which the fishing line is cast
(unreeled); specifically, left in FIG. 1 and FIG. 2 is the "front
(ward)" direction. The opposite direction thereof is referred to as
"rear (ward)" In addition, the material of each member is not
limited to the examples; well-known materials having the necessary
function and durability may be appropriately used.
[0041] As shown in FIG. 1, the spinning, reel 100 for fishing
comprises a reel body 110, a rotor 120, a spool 130, a handle 140,
and a fishing line guiding mechanism 2. Further, as shown in FIG.
2, the spinning reel 100 for fishing further comprises a drive
mechanism 150, an oscillating mechanism 160, a pinion gear 170, and
a spool shaft 180.
[0042] As shown in FIG. 1, the reel body 110 comprises a case part
111 and a lid portion 112. The lid portion 112 can be detached from
the case part 111. In addition, a rod support portion 114 is formed
extending in the case part 111, and a rod mounting stage 113 is
disposed at the distal end of the rod support portion 114. The rod
mounting stage 113 is a portion that is mounted to the fishing
rod.
[0043] As shown in FIG. 2, the reel body 110 comprises an internal
space that is defined by the case part 111 and the lid portion 112,
and houses various mechanisms in the internal space. In particular,
the drive mechanism 150 and the oscillating mechanism 160 are
housed in the reel body 110.
[0044] The drive mechanism 150 comprises a drive shaft 151 and a
drive gear 152. The drive shaft 151 is coupled to a handle shaft
141 and is integrally rotated with the handle shaft 141.
[0045] The drive gear 152 is coupled to the drive shaft 151 and is
integrally rotated with the drive shaft 151. The drive gear 152 is
a face gear and meshes with the gear portion 171 of the pinion gear
170. The drive shaft 151 and the drive gear 152 are rotated by
rotating the handle 140 that is mounted to the side surface of the
reel body 110, and the pinion gear 170 is also rotated.
[0046] The pinion gear 170 is disposed in the reel body 110. The
pinion gear 170 is formed in a tubular shape, and the spool shaft
180 extends through the inside of the pinion. gear 170. The pinion
gear 170 is rotatably disposed around the spool shaft 180. The
pinion gear 170 is supported in the reel body 110 via a plurality
of axle bearing members.
[0047] The spool shaft 180 extends forward from inside the reel
body 110. The spool shaft 180 is reciprocated in. a longitudinal.
direction by rotating the handle 140. In particular, the rotation
of the handle 140 rotates the pinion gear 170 via the drive gear
152. Accompanying the rotation of this pinion gear 170, the
oscillating mechanism 160 reciprocates the spool shaft 180 in the
longitudinal direction.
[0048] The spool 130 is a member onto which the fishing line is
wound. The spool 130 is supported to the distal end portion of the
spool shaft 180. The spool 130 is integrally reciprocated with the
spool shaft 180 in the longitudinal direction.
[0049] The rotor 120 is a member for winding the fishing line onto
the spool 130. The rotor 120 is rotatably supported on the reel
body 110 via the pinion gear 170. Specifically, the rotor 120 is
fixed to the front portion 172 of the pinion gear 170, and is
integrally rotated with the pinion gear 170. The rotor 120
comprises a rotor body portion (cylindrical portion) 121, a first
rotor arm 210, and a second rotor arm 220. The detailed structure
of the rotor 120 will be described later.
[0050] As shown in FIGS. 1-3, the fishing line guiding mechanism 2
is a mechanism for guiding the fishing line onto the spool 130. The
fishing line guiding mechanism 2 is attached across the distal end
portions of the first rotor arm 210 and the second rotor arm
220.
[0051] This fishing line guiding mechanism 2 comprises a first bail
support portion 21, a second bail support portion 22, a bail 23, a
support shaft 24, and a line roller 3. The fishing line guiding
mechanism 2 is pivotably mounted to assume the line winding
position in which the handle 140 is turned to wind the fishing line
onto the spool 130, and a line casting position in which the
fishing line is unreeled forward from the spool 130.
[0052] The first bail support member 21 is made of zinc, and is
pivotably mounted on the first rotor arm 210. Specifically, the
first bail support member 21 is pivotably mounted to the outside of
the front end portion of the first rotor arm 210.
[0053] The second bail support member 22 is made of zinc, and is
pivotably mounted on the second rotor arm 220. Specifically, the
second bail support member 22 is pivotably mounted on the outside
of the front end portion of the second rotor arm 220.
[0054] As shown in FIG. 4, the first bail support member 21
comprises a first end portion 21a and a second end portion 21b. The
first end portion 21a is pivotably mounted on the first rotor arm
210. The second end portion 21b of the first bail support member 21
supports the first end portion 23a of the bail 23 via the support
shaft 24.
[0055] As shown in FIG. 1 and FIG. 2, the second bail support
member 22 comprises a first end portion 22a and a second end
portion 22b. The first end portion 22a is pivotably mounted on the
second rotor arm 220. The second end portion 22b supports the
second end portion 23b of the bail 23.
[0056] As shown in FIG. 3, the bail 23 is a member curved in a
substantially U-shape, and made of, for example, stainless steel
alloy. The bail 23 is curved to protrude outwards along the outer
peripheral portion surface of the spool 130. This first end portion
23a of the bail 23 is supported on the first bail support portion
21 via the support shaft 24.
[0057] Further, the second end portion 23b of the bail 23 is
supported on the second bail support portion 22. When the fishing.
line guiding mechanism 2 is in the line winding position, the bail
23 guides the fishing line onto the line roller 3 via the first end
portion 23a. The line roller 3 is a member for guiding the fishing
line onto the spool 130 of the spinning reel 100 for fishing. When
the handle 140 is manually turned when the fishing line guiding
mechanism 2 is in the line winding position, the rotor 120 is
rotated and the fishing line is wound onto the spool 130 via the
line roller 3.
[0058] The overall configuration of the spinning reel 100 for
fishing is described above. Details of the rotor 120 will be
described next.
[0059] As shown in FIGS. 5A and 5B, the rotor 120 comprises a rotor
body portion 121, a first rotor arm 210, and a second rotor arm
220. In FIGS. 5A and 5B, the vertical direction of the drawing is
the longitudinal direction of the spinning reel 100.
[0060] The rotor body portion 121 of the rotor 120 will be
described using FIGS. 6A and 6B and FIG. 7. As shown in FIGS. 6A
and 6B, the rotor body portion 121 comprises a cylindrical shape
that extends longitudinally, in which the diameter is slightly
reduced toward the front. As shown in FIG. 6B, the rear end portion
126 of the rotor body portion 121 is open. The outer peripheral
portion side of the rear end portion 126 protrudes like a flange
around the entire peripheral portion to increase the strength so as
to be capable of supporting the first rotor arm 210 and the second
rotor arm 220 In FIGS. 6A and 6B, the vertical direction of the
drawing is the longitudinal direction of the spinning reel 100.
[0061] A disk portion 122 having a surface that is perpendicular to
the cylinder axis (center axis of the cylinder) S of the rotor body
portion 121 is formed on the inner side of the rotor body portion
121 that is slightly retracted from the front end 121a. A boss
portion 124 is formed in the center of the disk portion 122. A
circular through-hole 125 is formed in the central portion of the
boss portion. 124, and the front 172 of the above-described pinion
gear 170, as well as the spool shaft 180, extend through the
through-hole 125.
[0062] As shown in FIG. 2, the rotor 120 is fixed to the front 172
of the pinion. gear 170 by a nut 123, at the front of the disk
portion 122. When the user turns the handle 140, the drive gear 152
is rotated, and the pinion gear 170 that is meshed with the drive
gear 152 and disposed around the spool shaft 180 is rotated. Then,
the rotor 120 is rotated along with the rotation of the pinion gear
170
[0063] Returning to FIG. 6B, a thick-walled portion 127 (first
reinforcement portion) with a thicker wall than the surroundings
(other positrons) is disposed on the inner side of the rotor body
portion 121 in the cylinder axis S direction, in a position at
which the first rotor arm 210 is formed, which is rearward of the
disk portion 122. The shape of the thick-walled portion 127 is
rectangular having sides that are substantially parallel to the
cylinder axis S.
[0064] As shown in FIG. 7, the circumferential position of the
thick-walled portion 127 preferably overlaps the circumferential
position of the first rotor arm 210 from the point of view of
strength and rotational balance. For example, the central position
of the first rotor arm 210 in the circumferential direction
preferably matches the central position of the thick-walled portion
127 in the circumferential direction. Similarly, for reasons of
strength and rotational balance, the shape of the thick-walled
portion 127 is preferably line-symmetrical in the circumferential
direction. Line-symmetrical in the circumferential direction here
means that the left and right of the rotor body portion 121 in the
circumferential direction is line-symmetrical, with respect to a
virtual line in the cylinder axis S direction.
[0065] The radius r1 of the inner surface of the thick-walled
portion 127 (the distance from the cylinder axis S of the rotor
body portion 121 to the inner surface of the thick-walled portion
127, inner radius) is smaller than the inner radius r2 of the other
positions of the rotor body portion 121. That is, while the outer
diameter of the rotor body portion 121 is the same for the
thick-walled portion 127 and the other positions, the thick-walled
portion 127 is formed protruding in the radially inward direction
such that the thickness is increased compared to the other
positions of the rotor body portion 121.
[0066] The circumferential width in of the thick-walled portion 127
is smaller than the distance between the positions from where the
first support leg 211 and the second support leg 213 extend.
However, the circumferential width of the thick-walled portion 127
may be formed to be larger than the distance between the positions
from where the first support leg 211 and the second support leg 213
extend. While it is a trade-off between strength and weight, the
radial thickness (wall thickness) of the thick-walled portion 127
is preferably about 1.5 to 3 times the wall thickness of the
cylinder of the rotor body portion 121 besides the thick-walled
portion 127. The length n of the thick-walled portion 127 in the
cylinder axis S direction (refer to FIG. 6B) is preferably the
total length from the rear end portion 126 of the rotor body
portion 121 (open end) to the disk portion 122, but may be shorter
than this.
[0067] Load is applied to the rotor body portion 121 in the
respective positions to which the first rotor arm 210 and the
second rotor arm 220 are attached. In particular, since a first
bail support portion 21 having a line roller 3 that guides the
fishing line is attached to the first rotor arm 210, the first
rotor arm 210 side of the rotor body portion 121 receives the
tensile force of the fishing line and a large load is applied
thereto. Accordingly, a thick-walled portion 127 is provided, in
which the wall thickness of the cylinder of the rotor body portion
121 is increased at the position to which the first rotor arm 210
is attached, in order to increase the structural strength against
load. Then, the wall thickness of the cylinder at other positions
of the rotor body portion 121 is formed thinner than the thickness
of the case in which a thick-walled portion 127 is not provided and
the entire cylinder of the rotor body portion 121 is formed to have
a uniform thickness. As a result, it is possible to further reduce
the weight of the entire rotor body portion 121 while maintaining
the necessary structural strength.
[0068] The shape of the thick-walled portion 127 is rectangular,
but the shape does not necessarily have to be rectangular. For
example, the circumferential width of the thick-walled. portion 127
may be different between the rear end and the front end. However,
it is preferable from the point of strength and rotational balance
that the shape is symmetrical in the circumferential direction.
[0069] The thick-walled portion 127 may be integrally formed with
the rotor body portion 121, or formed by being producing separately
from the rotor body portion 121 and subsequently attached to the
rotor body portion 121. Further, when separately forming the
thick-walled portion 127 and the rotor body portion 121, the
material thereof may be varied. For example, a material with a
greater material strength than the rotor body portion 121 may be
used for the thick-walled portion 127.
[0070] Meanwhile, the thick-walled portion 127 is not formed on the
rotor body portion 121 on the second rotor arm 220 side. However,
the thick-walled portion 127 may also be formed on the rotor body
portion 121 on the second rotor arm 220 side. In this embodiment as
well, the thickness should be determined such that the rotation is
balanced, giving consideration to the weight of the first rotor arm
210 side and the thickness of the rotor body portion 121.
[0071] As shown in FIGS. 5A and 5B, a balance adjustment unit 129
for adjusting the rotational balance is disposed in the rear end
portion 126 of the rotor body portion 121 on the first rotor arm
210 side. The balance adjustment unit 129 is capable of, for
example, screw-fixing the necessary number of, for example, small
metal plate members 129a (weight material for adjustment,
balance)
[0072] The first bail support portion 21 and the second bail
support portion 22 are, for example, made of cast zinc, but the
weights thereof are likely to vary from the designed weight values.
If the weights vary, there is the possibility that rotational
balance cannot be achieved. In such a case, it is possible to
adjust the rotational balance by attaching the necessary number of
plate members 129a for balancing the rotation.
[0073] Details of the first rotor arm 210 and the second rotor arm
220 will be described next. As shown in FIGS. 5A and 5B and FIGS.
6A and 6B, the first rotor arm 210 and the second rotor arm 220
respectively extend radially outwardly from the outer peripheral
portion of the rear end portion 126 of the rotor body portion 121,
and further extend away from the rotor body portion 121 toward the
front. The first rotor arm 210 and the second rotor arm 220 are
disposed in opposite positions (facing each other) in the
circumferential direction of the rotor body portion 121. The rotor
body portion 121, the first rotor arm 210, and the second rotor arm
220 are made of, for example, aluminum alloy or magnesium
alloy.
[0074] As shown FIG. 5A, the first rotor arm 210 comprises a fiat
plate-shaped first support leg 211 and a fiat plate-shaped second
support leg 213. The first support, leg 211 and the second support
leg 213 respectively extend radially outwardly from the outer
peripheral portion of the rear end portion 126 of the rotor body
portion 121, and further extend away toward the front while being
curved. The first support leg 211 and the second support leg 213
are closer to each other toward the front, and are merged at the
front end portions. A space is formed between the first support leg
211 and the second support leg 213. The first bail support portion
21 is coupled to the front end portion of the first rotor arm
210.
[0075] As shown in FIG. 8, the first rotor arm 210 comprises a
first rib 215 (third reinforcement portion) that extends from the
side (side end portion) 212 of the first support leg 211. The first
rib 215 extends to the outer peripheral portion of the rotor body
portion 121 (outer peripheral portion of the rear end portion 126).
Further, the first rotor arm 210 comprises a. second rib 216 (third
reinforcement portion) that extends from the side (side end
portion) 214 of the second support leg 213. The second rib 216
extends to the outer peripheral portion of the rotor body portion
121 (outer peripheral portion of the rear end portion 126).
[0076] As shown in FIG. 8, the first rib 215 is formed
substantially perpendicular to the first support leg 211, from the
side 212 thereof. That is, the strength of the first support leg
211 is increased by forming an L-shaped cross sectional structure
with the first support leg 211 and the first rib 215. Similarly,
the second rib 216 is formed substantially perpendicular to the
second support leg 213, from the side 214 thereof That is, the
strength of the second support leg 213 is increased by forming an
L-shaped cross sectional structure with the second support leg 213
and the second rib 216.
[0077] In a conventional rotor arm, a plate-like member extends
radially outwardly from the rear end portion 126 of the rotor body
portion 121, and further extends forward while being curved.
However, a rib that extends from the plate-like member in a
perpendicular direction (such that the cross section becomes
L-shaped) is not provided, and strength is ensured as a single
wide, thick, plate-like member. In contrast, in the first rotor arm
210 according to the first embodiment, the weight of the entire
first rotor arm 210 is reduced while maintaining the strength by
respectively combining a first rib 215 and a second rib 216 to a
thinly formed, plate-like first support leg; 211 and second support
leg 213.
[0078] The reason for forming the first rotor arm 210 from two
support legs, the first support leg 211 and the second support leg
213, is to reduce the weight of the component members of the first
rotor arm 210 as much as possible. In addition, the reason for
providing a first rib 215 to the first support leg 211 and a second
rib 216 to the second support leg 213 is to maintain the necessary
strength by respectively reinforcing the first support leg 211 and
the second support leg 213. According to such a configuration, it
is possible to reduce the weight compared to a case in which the
first rotor arm 210 is formed of a single wide, thick, support leg,
as well as to ensure the necessary strength. Meanwhile, since a
bail reversing mechanism 30 (described later) is not disposed on
the first rotor arm. 210, it is easier to employ such a
configuration. The number of support legs may be three or more.
[0079] On the other hand, as shown in FIG. 5B, the second rotor arm
220 extends thick-walled radially outwardly from the rear end
portion 126 of the rotor body portion 121 in a position that
opposes the first rotor arm 210 (positioned. symmetrically with
respect to the cylinder axis S), and further extends forward
(substantially parallel to the rotor body portion 121) while being
curved. The second rotor arm 220 is wide at the extended portion
(base portion), and formed such that the width becomes narrower
toward the front end. The second bail support portion 22 is coupled
to the front end portion of the second rotor arm 220
[0080] As shown by the dotted lines in FIG. 5B, a bail reversing
mechanism 30 is disposed inside the portion of the second rotor arm
220 that extends forwardly. As described above, the fishing line
guiding mechanism 2 of the spinning reel 100 for fishing can assume
a line winding position, in which the fishing line is wound onto
the spool 130, and a line casting position, in which the fishing
line is freely unreeled forward (cast) from the spool 130. The bail
reversing mechanism 30 is a device for allocating (inverting) the
fishing line guiding mechanism 2 (in particular the second bail
support portion 22 thereof) between the line winding position and
the line casting position, and stabilizing the mechanism at the
respective positions.
[0081] As shown in FIG. 9A, the bail reversing mechanism 30
comprises a toggle spring 32, a guide rod 36, and a return lever
40.
[0082] The first end portion 22a of the second bail support portion
22 is made of zinc, and is coupled to the front end portion of the
second rotor arm 220 by a support shaft 22c. An engagement hole 22d
that engages one end 36a of the guide rod 36 and a lever insertion
hole 22f in which one end 40a of the return lever 40 is inserted,
are provided in the first end portion 22a.
[0083] The guide rod 36 is a member that transmits the biasing
force of the toggle spring 32 to the second bail support portion
22. The guide rod 36 is made of stainless steel, with one end 36a
bent at a right angle and engaging the engagement hole 22d of the
first end portion 22a. The guide rod 36 includes a locking
projection 38 that locks the one end portion 32a of the toggle
spring 32 in front of the bent position. The other end portion 36b
of the guide rod 36 is inserted halfway into the toggle spring 32.
However, the other end portion 36b of the guide rod 36 does not
abut the bottom surface 34a of the spring guide 34, even if the
toggle spring 32 is compressed.
[0084] The toggle spring 32 has the role of biasing the guide rod
36. The toggle spring 32 is a coil spring, one end portion 32a of
which is locked to the locking projection 38 of the guide rod 36
via a resin plate 33, and the other end portion 32b of which is
made of resin and inserted in a spring guide 34, a bottomed
quadrangular prism-shaped vessel, and abutted and supported on the
bottom surface 34a of the spring guide 34. The central portion of
spring guide 34 is rotatably supported such that the orientation
thereof is varied accompanying changes in the orientation of the
guide rod 36. In FIGS. 9A and 9B, the spring guide 34 is
illustrated such that the inside is visible.
[0085] One end portion 36a of the guide rod 36 is engaged with the
engagement hole 22d of the first end portion 22a. The guide rod 36,
biased by the toggle spring 32, thereby biases the first end
portion 22a in the forward direction. The first end portion 22a of
the second bail support portion 22 is stabilized in the line
winding position or the line casting position by this biasing
force.
[0086] Although the guide rod 36 is engaged with the engagement
hole 22d of the first end portion 22a, since the guide rod 36 (made
of stainless steel) and the first end portion 22a (made of zinc)
have different materials and, if engaged directly, there is the
risk that the engagement hole 22d will be corroded due to the
difference in the ionization tendency of the two materials when
salt water, etc., intrudes into a gap. Accordingly, as shown in
FIG. 10, a cylindrical resin collar (insulating member) 22h is
fitted in the engagement hole 22d of the first end portion 22a of
the second bail support portion 22. The one end portion 36a of the
guide rod 36 is engaged with the engagement hole 22d via resin
collar 22h. The occurrence of electrolytic corrosion is prevented
by inserting resin collar 22h and insulating the two in this
manner. Meanwhile, the guide rod 36 is not shown in FIG. 10.
[0087] The return lever 40 is a member for transmitting a force for
rotating the first end portion 22a of the second bail support
portion 22 that is in the line casting position, in the direction
to return to the line winding position. As shown in FIG. 9A and
FIG. 10, one end portion 40a of the return lever 40 is bent at a
right angle and inserted into the lever insertion hole 22f of the
first end portion 22a.
[0088] The other end portion 40b of the return lever 40 is bent at
a right angle in the opposite side of the one end portion 40a. The
other end portion 40b of the return lever 40 is positioned
forwardly of the rear end portion 126 of the rotor 120. when the
first end portion 22a is in the line winding position. However, as
shown in FIG. 9B, the other end portion 40b of the return lever 40
is retracted to the vicinity of the rear end portion 126 of the
rotor body portion 121, when the first end portion 22a is in the
line casting position That is, the other end portion 40b of the
return levee 40 approaches a front flange portion 115 of the reel
body 110 (refer to FIG. 2) that faces the rear end portion 126 of
the rotor body portion 121.
[0089] As shown in FIG. 11, a return unit 42 is disposed on the
front flange portion 115 of the reel body 110. The return unit 42
is a substantially triangular member in which an inclined surface
42c is formed such that the height thereof becomes higher toward
the rotational direction of the rotor 120. A projection 42a is
formed on the bottom surface of the return unit 42, and the
projection 42a is inserted in a hole in the front flange portion
115 of the reel body 110. The return unit 42 is positioned by the
projection 42a, and further fixed by bolt 42b.
[0090] In the prior art, a constricted portion is generally formed
in the lower part of the return unit, which is fixed by inserting
the constricted portion into a notched portion disposed in to the
front flange portion from the side. However, this return unit 42 is
positioned and fixed by a bolt 42b and a projection 42a formed on
the bottom surface. With this configuration, it is possible to
simplify the structure around the front flange portion 115, which
increases the freedom in design of the peripheral members.
[0091] As shown in FIG. 11, the return unit 42 is disposed on a
front flange portion 115 of the reel body 110 at a position to
which the rod support portion 114 extends.
[0092] When trying to manually switch the fishing line guiding
mechanism 2 from the line winding position to the line casting
position, the user will often hold the fishing line by hooking the
line with a finger of the right hand, and move the bail 23 with the
left hand to switch the positions. At this time, in order for the
user to hook the fishing line with a finger, it is necessary to
move the bail 23 in a position where the first rotor arm 210 having
the line roller 3 comes to the rod side (the side to which the rod
support portion 114 is disposed). At this time, if the return unit
42 is on the opposite position of the rod side, the second rotor
arm 220 also comes to the opposite position of the rod side;
therefore, the return lever 40 that is disposed inside the second
rotor arm 220 interferes with the return unit 12, and the bait 23
cannot be moved to the tine casting position
[0093] By disposing the return unit 42 on the front flange portion
115 at a position to which the rod support portion 114 extends,
when the user tries to manually switch the fishing tine guiding
mechanism 2 from the line winding position to the line casting
position in a position at which the first rotor arm 210 comes to
the rod side, the return lever 40 does not interfere with the
return unit 42, and it is possible to switch the positions of the
fishing line guiding mechanism 2 without imparting discomfort to
the user.
[0094] While the one end portion 40a of the return lever 40 is
inserted in the lever insertion hole 22f of the first end portion
22a of the second bail support portion 22 when in the line winding
position, the one end portion 40a does not abut the side wall of
the lever insertion hole 22f, and there is a space that allows a
certain degree of freedom for movement. Consequently, for example,
when the bail 23 is deformed, there is the possibility that the
return lever 40 can be moved backward even if the first end portion
22a is in the line winding position. If the return lever 40 is
moved backward in a position in which the first end portion 22a is
in the line winding position, a possibility arises in which the
other end portion 40b of the return lever 40 comes into contact
with the return unit 42, when contact should not occur.
[0095] In order to eliminate such possibilities, the bent one end
portion 40a of the return lever 40 is biased by a lifting coil
spring (biasing member) 44, as shown in FIG. 10. The lifting spring
44 biases the return lever 40 forward such that the return lever 40
is not retracted.
[0096] The front end (upper end in FIG. 10) of the lifting spring
44 is locked by being wound onto the one end portion 40a of the
return lever 40, and the rear end (lower end in FIG. 10) is
configured to abut the side wall 22k of the rear end (lower end in
FIG. 10) of the lever insertion hole 22f, when in the line winding
position. According to this configuration, the lifting spring 44 is
capable of biasing the return lever 40 forward (upward in FIG. 10)
with respect to the first end portion 22a of the second bail
support portion 22 when in the line winding position, such that the
return lever 40 does not come into contact with the return unit
42.
[0097] The operation of the bail reversing mechanism 30 will be
described next As shown in FIG. 9A, when the fishing line guiding
mechanism 2 is in the line winding position, the one end portion
36a of the guide rod 36 is on the left side of an imaginary line
segment G that passes through the center of the support shaft 22c
of the second bail support portion 22 and that is parallel to the
longitudinal direction. With the biasing force of the toggle spring
32, the guide rod 36 biases the second bail support portion 22 in
the upper left direction of the drawing, and stabilizes the second
bail support portion 22 in this position.
[0098] When putting the fishing line guiding mechanism 2 in the
line casting position in order to cast the fishing line in a
forward direction, the user holds the bail 23 with a hand and turns
the bail in the direction of arrow L in FIG. 9A. The second bail
support portion 22 is thereby rotated counterclockwise around the
support shaft 22c. While the biasing force of the toggle spring 32
acts to suppress this rotation, the engagement hole 22d (along with
the one end portion 36a of the guide rod 36 which is engaged
therewith) is rotated counterclockwise against the biasing force of
the toggle spring 32.
[0099] The position where the engagement hole 22d is rotated
halfway (not shown), and the center of the support shaft 22c, the
engagement hole 22d, and the guide rod 36 that is engaged with the
engagement hole 22d form a straight line, becomes the dead center
of the bail reversing mechanism 30. When in the dead center
position, the biasing force of the toggle spring 32 is received by
the support shaft 22c, and does not act in a direction to rotate
the second bail support portion 22 to either the left or to the
right.
[0100] When the engagement hole 22d is further rotated
counterclockwise beyond the dead point (moving rightward in the
drawing), the biasing force of the toggle spring 32 then acts in a
direction to rotate the second bail support portion 22 in the
opposite, counterclockwise direction. The second bail support
portion 22 is then rotated counterclockwise to the line casting
position shown in FIG. 9A. In this position, the one end portion
36a of the guide rod 36 is on the right side of the imaginary line
segment G. In addition, the one end portion 40a of the return lever
40 is pushed to the front end wall 22g of the lever insertion hole
22f, and the return lever 40 is moved downwardly. The other end
portion 40b of the return lever 40 is positioned in proximity to
the front flange portion 115 of the reel body 110, which is not
shown, as described above.
[0101] When the fishing line guiding mechanism 2 is in the line
casting position shown in FIG. 9A, if the user turns the handle 140
to wind the fishing line, the rotor 120 is rotated. Then, the other
end portion 40b of the return lever 10 that rotates along with the
rotor 120 abuts the inclined surface 42c of the return unit 42
(refer to FIG. 11), and is gradually lifted upwardly along the
inclination of the inclined surface 42c following the rotation of
the rotor 120. The other end portion 40a of the return lever 40
thereby pushes the front end wall 22g of the lever insertion hole
22f upwardly in the drawing. Accordingly, the second bail support
portion 22 is rotated around the support shaft 22c, in the
direction shown by the arrow R in FIG. 9B.
[0102] While the engagement hole 22d is rotated clockwise against
the biasing force of the toggle spring 32 at the beginning of
rotation, when the engagement hole 22d is further rotated and
passes the dead point, the biasing force of the toggle spring 32
then acts in a direction to rotate the second bail support portion
22 in the clockwise direction. Then, the second bail support
portion is stabilized in the line winding position shown in FIG.
9B. By turning the handle 140 in this manner, the fishing line
guiding mechanism 2 is automatically set in the line winding
position.
[0103] In the rotor 120 of a spinning reel 100 for fishing
according to the first embodiment described above, while the other
configurations are the same, the rotor body portion 121 is more
lightweight while maintaining the necessary strength compared to
those having a conventional structure in which the wall thickness
is uniform without having a thick-walled portion 127. In addition,
the first rotor arm 210 is formed from a flat plate-shaped first
support leg 211 and a flat plate-shaped second support leg 213,
respectively provided with a first rib 215 and a second rib 216 for
reinforcement. Accordingly, while other configurations are the
same, the rotor arm is further reduced in weight while maintaining
the necessary strength, compared to those having a conventional
structure that does not comprise a first rib 215 and a second rib
216 for reinforcement.
[0104] Additionally, the spinning reel 100 for fishing includes a
bail reversing mechanism 30 inside the second rotor arm 220 on the
opposite side of the first rotor arm 210, which is on the side
where the line roller 3 is present. This structure makes it is
easier to achieve a balance in weight between the first rotor arm
210 and the second rotor arm 220, thereby reducing the weight of
the rotor 120.
[0105] Specifically, since the first rotor arm 210 does not
comprise a bail reversing mechanism 30, the first rotor arm is more
lightweight than the second rotor arm 220, which comprises a bail
reversing mechanism 30, while the other configurations are the
same. Accordingly, it is easier to achieve a rotational balance,
even if a thick-walled portion 127 is not disposed on the rotor
body portion 121 on the second rotor arm 220 side and a
thick-walled portion 127 is disposed only on the rotor body portion
121 on the first rotor arm 210 side. In other words, it is possible
to reduce the amount of weight material for adjustment (balance),
which is added only to achieve a balance, resulting in a reduction
in weight.
[0106] As described above, the rotor 120 of a spinning reel 100 for
fishing is a rotor that achieves a rotational balance and reduces
the weight of the whole while maintaining the necessary
strength.
[0107] Meanwhile, the configuration to provide a thick-walled
portion 127 on the rotor body portion 121 on the first rotor arm
210 side, and the configuration to form the first rotor arm 210
from a fiat plate-shaped first support leg 211 and a fiat
plate-shaped second support leg 213 and to respectively provide a
first rib 215 and a second rib 216 thereto, may each be selectively
executed.
[0108] In addition, the configuration to provide a bail reversing
mechanism 30 inside the second rotor arm 220 on the opposite side
from the line roller 3, the configuration to provide a thick-walled
portion 127 on the rotor body portion 121 on the first rotor arm
210 side, and the configuration to form the first rotor arm 210
from a fiat plate-shaped first support leg 211 and a flat
plate-shaped second support leg 213, and to respectively provide a
first rib 215 and a second rib 216 thereto, may each be selectively
executed, or two or more may be executed in combination.
Second Embodiment
[0109] In the first embodiment, a thick-walled portion 127 is
formed on the inner side of the cylinder of the rotor body portion
121 on the first rotor arm 210 side, and the thickness of the other
portions of the cylinder of the rotor body portion 121 is reduced,
to reduce the overall weight of the rotor body portion 121. In the
second embodiment, a mode in which the overall weight of the rotor
body portion 121A is reduced by another configuration will be
described.
[0110] As shown in FIGS. 12A and 12B, an inclined thick-walled
portion 128a (second reinforcement portion) and an inclined
thick-walled portion 128b (second reinforcement portion) having
thicker walls than the surroundings, which extend inclined with
respect to the cylinder axis S direction, are provided from the
rear to the front of the side surface of the rotor body portion
(cylindrical portion) 121A, between the first rotor arm 210 and the
second rotor arm 220. Extending inclined with respect to the
cylinder axis S direction means extending on the cylinder side
surface of the rotor body portion 121A in a partial spiral form
(helical arc).
[0111] The inclined thick tilled portions 128a and 128b are
portions in which the wall thicknesses are formed to be thicker
than the thick-wall of the other portions of the cylinder of the
rotor body portion 121A. The inclined thick-walled portions 128a
and 128b respectively extend in a spiral form from the rear to the
front of the rotor body portion 121A so as to be oriented forward,
from the first rotor arm 210 side to the second rotor arm 220 side.
The inclined thick-walled portion 128a and the inclined
thick-walled portion 128b are formed in plane symmetry to each
other, with respect to a surface that includes the cylinder axis S.
More specifically, the inclined thick-walled portion 128a and the
inclined thick-walled portion 128b are formed in plane symmetry to
each other, with respect to a surface that includes the cylinder
axis S and that passes the central portion of the first rotor arm
210 and the central portion of the second rotor arm 220.
[0112] As described above, since a particularly large load is
applied to the first rotor arm 210 side of the rotor body portion
121A, the inclined thick-walled portions 128a and 128b preferably
have such an orientation and arrangement, from the point of
strength and rotational balance.
[0113] The wall thickness of the cylinder of the rotor body portion
121A, excluding the inclined thick-walled portions 128a and 128b,
may be thinner than the wall thickness of cases in which the
cylindrical portion of the rotor body portion 121A has a uniform
thickness. While it is determined as a trade-off between strength
and weight, the wall thicknesses of the inclined thick-walled
portions 128a and 128b are preferably about 1.5 to 3 times the wall
thickness of the cylinder portion besides the inclined thick-walled
portions 128a and 128b. By disposing inclined thick-walled portions
128a and 128b on the cylinder and reducing the wall thickness of
the other cylindrical portions, it is possible to reduce the
overall weight of the rotor body portion 121A while maintaining the
necessary strength.
[0114] In the second embodiment, the range in which the inclined
thick-walled portions 128a and 128b are provided is a range that is
on the rear side of the disk portion 122. However, the range in
which the inclined thick-walled portions 128a and 128b are provided
may be wider, or narrower.
[0115] In the second embodiment, inclined thick-walled portions
128a and 128b are formed as the second reinforcement portions;
however, a reinforcement material having a higher strength than the
cylindrical portion of the rotor body portion 121A may be adhered
to the wall of the cylindrical portion as well. In addition, it is
also possible to encapsulate a reinforcement material in the wall
of the cylindrical portion. Such a reinforcement material is
preferably provided inclined with respect to the cylinder axis
S.
[0116] Meanwhile, it is not necessary to reduce the wall thickness
of the cylinder of the rotor body portion 121A on the first rotor
arm 210 side and the second rotor arm 220 side.
[0117] A method to provide a thick-walled portion in a direction
that is parallel, or perpendicular, to the cylinder axis S
direction is also conceivable as a method to reduce the overall
thickness of the cylinder of the rotor body portion 121A while
maintaining the overall strength by making a portion thereof thick
walled. However, it has been found that providing inclined
thick-walled portions 128a and 128b in an oblique direction with
respect to the cylinder axis S direction. achieves a higher effect
of reducing the weight of the rotor body portion 121A while
preventing a reduction in the strength of the rotor body portion
121A. Additionally, it has been found that it is effective to
reduce the wall thickness across a wide range and to provide a
reinforcement portion whereby the wall thickness is increased
diagonally.
Modified Examples
[0118] The cylindrical portion of positions adjacent to the
inclined thick-walled portions 128a and 128b in the second
embodiment (pot only directly adjacent positions, but also
including nearby positions) may be (partially) open. For example,
as in the rotor body portion 121A shown in FIG. 13A, an opening
230a and an opening 230b are disposed in the cylindrical portions
between the first rotor arm 210 and the second rotor arm 220. As
shown in FIG. 13B, an opening 230c and an opening 230d are also
disposed in the opposite side in the same manner. That is, an
inclined reinforcement portion 128c (second reinforcement portion)
that extends inclined with respect to the cylinder axis S direction
is provided, and an opening 230a and an opening 230b are disposed
in adjacent positions thereof. Similarly, an inclined reinforcement
portion 128d (second reinforcement portion) that extends inclined
with respect to the cylinder axis S direction is provided, and an
opening 230c and an opening 230d are provided in adjacent positions
thereof. The wall thicknesses of the inclined reinforcement
portions 128c and 128d are thicker than the wall thickness of cases
in which the entire rotor body portion 121A has a uniform
thickness. The inclined reinforcement portions 128c and 128d have
the same role as the inclined thick-walled portions 128a and 128b
of the second embodiment.
[0119] In the case of this modified example, the wall thickness of
portions other than the openings may be the same. In this
embodiment, it is possible to form an opening by punching a portion
of a cylinder with a uniform wall thickness. In other words, large
openings 230a, 230b, 230c, and 230d may be disposed in two
cylindrical portions between the first rotor arm 210 and the second
rotor arm 220 of the rotor body portion 121A, leaving behind
inclined reinforcement portions 128c and 128d that extend in a
direction that is inclined with respect to the cylinder axis S
(longitudinal) direction. Meanwhile, it is preferable not to
provide openings in the cylindrical portion to which the first
rotor arm 210 is attached and the cylindrical portion to which the
second rotor arm 220 is attached from the point of view of
strength. The shape of the opening is substantially trapezoidal in
the example shown in FIGS. 13A and 13B, but the shape is not
limited to a trapezoid. However, when considering the rotational
balance, the shape is preferably formed M plane symmetry with
respect to a plane that includes the cylinder axis S and that
passes the central portion of the first rotor arm 210 and the
central portion of the second rotor arm 220.
[0120] By partially opening the cylindrical portions besides the
inclined thick-walled portions 128a and 128b in the second
embodiment in this manner, it is possible to reduce the weight of
the rotor body portion 121A as a whole.
[0121] Conventionally, a method is known in which multiple small
openings (for example circular openings) are used to reduce the
weight of a plate-like member. However, it has been found that
having openings across a wide range and to provide diagonal
reinforcement portions to the openings is more effective to reduce
the overall weight while maintaining the necessary strength.
[0122] Meanwhile, the thick-walled portion 127 of the first
embodiment, the inclined thick-walled portions 128a and 128b of the
second embodiment (or the inclined reinforcement portions 128c and
128d of the modified example) for reducing the weight of the rotor
body portion 121 may each be selectively executed, or two or more
may be executed in combination.
[0123] Several embodiments of the present invention and modified
example thereof were described above. However, the present
invention is not limited to these embodiments and modified example.
In addition, of the characterizing configurations described above,
one may be selectively (individually) executed, or a plurality of
configurations may be combined, giving consideration to the
rotational balance.
* * * * *