U.S. patent application number 11/338729 was filed with the patent office on 2006-06-08 for compact wheel speed detector capable of saving space and improving workability.
This patent application is currently assigned to KOYO SEIKO CO., LTD.. Invention is credited to Fujio Harumi, Tomohiro Ishii, Motoshi Kawamura, Kanichi Kouda, Naoki Morimura, Minoru Sentoku, Nobuyuki Seo, Yoshifumi Shige, Kazutoshi Toda.
Application Number | 20060119349 11/338729 |
Document ID | / |
Family ID | 15595761 |
Filed Date | 2006-06-08 |
United States Patent
Application |
20060119349 |
Kind Code |
A1 |
Sentoku; Minoru ; et
al. |
June 8, 2006 |
Compact wheel speed detector capable of saving space and improving
workability
Abstract
A wheel speed detector for detecting a relative rotating speed
between an outer ring and an inner ring by means of a magnetic
sensor in association with a magnetic ring. A stationary seal
member is fixed to the stationary ring and a rotatable seal member
is fixed to the rotatable ring. The seal members engage to seal a
gap between the inner ring and the outer ring. The magnetic sensor
is fixed to a radial inner surface of the stationary seal member
and the magnetic ring is fixed to a radial outer or a radial inner
surface of the rotatable seal member and surfaces of the magnetic
ring other than that fixed to the radial inner surface of the
rotatable seal member are covered with a seal lip.
Inventors: |
Sentoku; Minoru; (Ikoma-gun,
JP) ; Kawamura; Motoshi; (Kitakatsuragi-gun, JP)
; Toda; Kazutoshi; (Tondabayashi-shi, JP) ; Seo;
Nobuyuki; (Yamatokooriyama-shi, JP) ; Morimura;
Naoki; (Kashiba-shi, JP) ; Ishii; Tomohiro;
(Yamtotakada-shi, JP) ; Kouda; Kanichi;
(Kashiwara-shi, JP) ; Shige; Yoshifumi;
(Kashiwara-shi, JP) ; Harumi; Fujio;
(Hirakata-shi, JP) |
Correspondence
Address: |
NIXON & VANDERHYE, PC
901 NORTH GLEBE ROAD, 11TH FLOOR
ARLINGTON
VA
22203
US
|
Assignee: |
KOYO SEIKO CO., LTD.
|
Family ID: |
15595761 |
Appl. No.: |
11/338729 |
Filed: |
January 25, 2006 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
10186745 |
Jul 2, 2002 |
7034521 |
|
|
11338729 |
Jan 25, 2006 |
|
|
|
09584406 |
Jun 1, 2000 |
6605938 |
|
|
10186745 |
Jul 2, 2002 |
|
|
|
Current U.S.
Class: |
324/174 |
Current CPC
Class: |
G01P 3/487 20130101;
G01P 3/443 20130101; F16C 33/7879 20130101; F16J 15/326 20130101;
F16C 41/007 20130101; F16C 19/185 20130101; F16C 33/78 20130101;
F16C 2326/02 20130101; F16C 19/186 20130101 |
Class at
Publication: |
324/174 |
International
Class: |
G01P 3/48 20060101
G01P003/48 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 2, 1999 |
JP |
11-154964 |
Claims
1. A wheel speed detector for detecting a relative rotating speed
between an outer ring and an inner ring by means of a magnetic
sensor in association with an opposing magnetic ring, wherein one
of the outer ring and the inner ring is rotatable while the other
is stationary, the magnetic ring is fixed to the rotatable ring and
the magnetic sensor is fixed to the stationary ring; and wherein
the magnetic sensor is fixed to a stationary seal member, which is
disposed at a portion where the magnetic ring and the magnetic
sensor are opposed to each other, on a surface opposite from the
magnetic ring.
2. A wheel speed detector for detecting a relative rotating speed
between an outer ring and an inner ring by means of a magnetic
sensor in association with an opposite magnetic ring, wherein one
of the outer ring and the inner ring is rotatable while the other
is stationary, the magnetic ring is fixed to the rotatable ring and
the magnetic sensor is fixed to the stationary ring; and wherein a
seal device comprises a stationary seal member fixed to the
stationary ring and a rotatable seal member being opposed axially
to the stationary seal member and fixed to the rotatable ring, and
seals a gap between the inner ring and the outer ring; and the
magnetic sensor is fixed on an axial outer or an axial inner
surface of the stationary seal member.
3. A wheel speed detector as claimed in claim 2, wherein the
magnetic ring is fixed on an axial outer or an axial inner surface
of the rotatable seal member.
4. A wheel speed detector as claimed in claim 2, wherein a seal
portion of the seal device is provided on a portion where the
stationary seal member and the rotatable seal member face each
other.
5. A wheel speed detector as claimed in claim 2, wherein the
stationary member is nonmagnetic.
6. A wheel speed detector as claimed in claim 4, wherein the
stationary member is nonmagnetic.
7. A wheel speed detector for detecting a relative rotating speed
between an outer ring and an inner ring by means of a magnetic
sensor fixed to the inner ring in association with an opposite
magnetic ring fixed to the outer ring, wherein a stationary member
axially opposite to the magnetic ring is fixed to the inner ring,
the magnetic sensor is fixed to the stationary member on a surface
opposite from the magnetic ring, and a labyrinth seal is provided
between the stationary member and an axial end surface of the outer
ring.
8. A wheel speed detector as claimed in claim 7, wherein a portion
of said detector where the labyrinth seal is provided is formed of
a synthetic resin covering over the magnetic sensor and is
integrated with the stationary member.
Description
[0001] This application is a division of application Ser. No.
10/186,745 filed Jul. 2, 2002, which is a division of application
Ser. No. 09/584,406, filed Jun. 1, 2000, the entire contents of
each of which is hereby incorporated by reference in this
application.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a wheel speed detector that
is intended to detect the rotating speed of a wheel and used for
the antilock brake or the like of an automobile.
[0004] 2. Discussion of Prior Art
[0005] Conventionally, as a wheel speed detector of this type,
there has been provided a detector that is provided with a magnetic
sensor fixed to the fixed side of an inner ring and an outer ring
and a magnetic ring arranged on the rotating side so as to face
this magnetic sensor and detects the rotating speed of the wheel by
detecting a magnetic field varied in accordance with the rotation
of this magnetic ring by means of the magnetic sensor.
[0006] The wheel speed detector of the above type has
conventionally been arranged independently of a seal device for
sealing a space between the inner ring and the outer ring with
respect to the outside. This accordingly requires a special-purpose
space and disadvantageously leads to a lack of compactness. The
above arrangement also requires certain consideration for the
dispositional relation of the detector relative to the other
components that constitute the wheels and accordingly leads to the
problem that the workability in the assembling stage is not
good.
SUMMARY OF THE INVENTION
[0007] Accordingly, the object of the present invention is to
provide a compact wheel speed detector capable of saving space
around the wheels and improving the workability.
[0008] In order to achieve the object, there is provided a wheel
speed detector for detecting a relative rotating speed between an
outer ring and an inner ring by means of a magnetic sensor in
association with an opposite magnetic ring, wherein one of the
outer ring and the inner ring is rotatable while the other is
stationary, the magnetic ring is fixed to the rotatable ring and
the magnetic sensor is fixed to the stationary ring,
[0009] the magnetic ring and the magnetic sensor being integrated
with a seal device for sealing a gap between the inner ring and the
outer ring.
[0010] According to the present invention, the magnetic ring and
the magnetic sensor are integrated with the seal device for sealing
the gap between the inner ring and the outer ring. This arrangement
can improve the compactness and the workability in the assembling
stage.
[0011] In one embodiment of the present invention, the seal device
has the magnetic ring and the magnetic sensor built-in.
[0012] According to the above construction, the seal device has the
magnetic ring and the magnetic sensor built-in. This arrangement
can enable the space saving around the wheels.
[0013] In one embodiment of the present invention, the magnetic
ring is fixed to a rotatable member of the seal device for sealing
the gap between the inner ring and the outer ring, and the magnetic
sensor is fixed to a stationary member of the seal device.
[0014] According to the above construction, the magnetic ring and
the magnetic sensor are integrated with the seal device by fixing
the magnetic ring to the rotatable member of the seal device and
fixing the magnetic sensor to the stationary member. This
arrangement can enable the space saving around the wheels and
improve the compactness and the workability in the assembling
stage.
[0015] In one embodiment of the present invention, the magnetic
ring and the magnetic sensor are arranged in a space where the
rotatable member and the stationary member of the seal device face
each other.
[0016] According to the above construction, the magnetic ring and
the magnetic sensor are arranged in the space where the rotatable
member and the stationary member of the seal device face each
other. This arrangement can enable the space saving around the
wheels and improve the compactness and the workability in the
assembling stage.
[0017] In one embodiment of the present invention, a seal portion
of the seal device is provided on both sides of the portion where
the magnetic ring and the magnetic sensor face each other.
[0018] According to the above construction, the seal portion is
provided on both sides of the oppositional portion where the
magnetic ring and the magnetic sensor face each other. This can
prevent water from intruding into the bearing inwardly of the
magnetic sensor and prevent lubricant from leaking out of the
bearing.
[0019] In one embodiment of the present invention, the magnetic
ring and the magnetic sensor face each other obliquely with respect
to the axis of rotation of the inner ring and the outer ring.
[0020] According to the above construction, the magnetic ring and
the magnetic sensor, which face each other obliquely with respect
to the axis of rotation of the inner ring and the outer ring, can
be reduced in the radial dimension and compacted.
[0021] In one embodiment of the present invention, the stationary
member of the seal device concurrently serves as a magnetic path of
the magnetic sensor.
[0022] According to the above construction, the stationary member
of the seal device concurrently serves as the magnetic path (yoke)
of the magnetic sensor, and this can reduce the number of
components for the achievement of compacting.
[0023] In one embodiment of the present invention, a seal portion
constructed of a slinger and a seal lip to be brought in sliding
contact with the slinger is provided axially outside the
oppositional portion where the magnetic ring and the magnetic
sensor face each other, and a main seal portion is provided between
this seal portion and the oppositional portion.
[0024] According to the above construction, the additional seal
portion constructed of the slinger and the axial seal lip is
provided outside the main seal portion. This arrangement can
improve the sealing performance and improve, in particular, the
waterproof performance of the sensor portion.
[0025] In one embodiment of the present invention, the seal device
is constructed of a rotatable member and a stationary member,
[0026] the magnetic sensor is fixed to the stationary member, the
magnetic ring is fixed to the rotatable member, and the magnetic
ring is covered with a nonmagnetic elastic member.
[0027] According to the above construction, the magnetic ring is
covered with the nonmagnetic elastic member. This arrangement can
prevent the magnetic foreign material such as iron powder from
adhering to the magnetic ring and prevent the occurrence of
noises.
[0028] In one embodiment of the present invention, the stationary
member and the rotatable member constitute a labyrinth seal,
and
[0029] the nonmagnetic elastic member is provided with an axial lip
that extends in the axial direction and comes in sliding contact
with the stationary member and a main lip that extends in the
radial direction and comes in sliding contact with the stationary
member.
[0030] According to the above construction, the labyrinth seal
constructed of the stationary member and the rotatable member, the
axial lip and the main lip can provide three-point sealing, and
this can reliably prevent water from intruding into the
bearing.
[0031] In one embodiment of the present invention, the nonmagnetic
elastic member is provided with an auxiliary lip that comes in
sliding contact with the stationary member inside the main lip.
[0032] According to the above construction, the auxiliary lip
brought in sliding contact with the stationary member inside the
main lip is provided, and this can further improve the waterproof
performance.
[0033] In one embodiment of the present invention, the stationary
member is made of austenite-based stainless steel, copper or
aluminum.
[0034] According to the above construction, the stationary member
for fixing the magnetic sensor is made magnetic with the material
of austenite-based stainless steel, copper or aluminum. This
arrangement can improve the magnetic detection accuracy of the
magnetic sensor.
[0035] In one embodiment of the present invention, the seal device
is constructed of a rotatable member and a stationary member,
[0036] an axial lip that extends axially outwardly of an axial
outer surface of the rotatable member and comes in sliding contact
with an axial inner surface of the stationary member is
provided,
[0037] the magnetic ring is fixed to an axial inner surface of the
rotatable member, and the magnetic sensor is fixed to an axial
outer surface of the stationary member.
[0038] According to the above construction, the magnetic ring is
fixed to the inner surface of the rotatable member, and the axial
lip is fixed to the outer surface of the rotatable member. This
arrangement can magnetize the magnetic ring from inside the
rotatable member without being obstructed by the axial lip and
facilitate the manufacturing.
[0039] In one embodiment of the present invention, the rotatable
member is a magnetic body.
[0040] According to the above construction, the rotatable member to
which the magnetic ring is fixed is magnetic, and this can increase
the magnetic force of the magnetic ring.
[0041] In one embodiment of the present invention, the magnetic
ring and the magnetic sensor face each other in the radial
direction.
[0042] According to the above construction, the magnetic ring and
the magnetic sensor face each other in the radial direction, and
this can reduce the axial dimension and achieve compacting in the
axial direction.
[0043] In one embodiment of the present invention, the seal device
is constructed of a rotatable member and a stationary member,
[0044] the magnetic ring is fixed to the rotatable member, the
magnetic sensor is fixed to the stationary member and there are
provided
[0045] a main lip that is fixed to the rotatable member or the
stationary member and seals a path between the rotatable member and
the stationary member, a first auxiliary lip located inside the
main lip, an axial lip located outside the main lip and a second
auxiliary lip located outside the axial lip.
[0046] According to the above construction, the second auxiliary
lip located outside the axial lip is provided in addition to the
main lip, the first auxiliary lip and the axial lip, and this can
improve the sealing performance. The second auxiliary lip prevents
muddy water from directly splashing on the axial lip, and this can
improve muddy water resistance.
[0047] In one embodiment of the present invention, the inner ring
is rotatable, and
[0048] the second auxiliary lip is fixed to the rotatable member
fixed to the inner ring and extends radially outwardly to seal a
path between the rotatable member and the stationary member.
[0049] According to the above construction, the second auxiliary
lip is fixed to the rotatable member fixed to the rotatable inner
ring located, and therefore, a centrifugal force in the rotating
stage presses the second auxiliary lip against the stationary
member located radially outside. This arrangement can improve the
sealing performance in the rotating stage.
[0050] In one embodiment of the present invention, a cover member
for covering the magnetic sensor is provided,
[0051] the cover member has an inclined surface inclined relative
to the axis of rotation of the outer ring and the inner ring
and
[0052] a harness connected to the magnetic sensor is projecting
from the inclined surface.
[0053] According to the above construction, the harness is made to
project from the inclined surface of the cover member of the
magnetic sensor, and this can widen the harness outlet width.
[0054] In one embodiment of the present invention, the seal device
is constructed of a rotatable member and a stationary member,
[0055] a magnetic ring and a magnetic sensor are fixed to an axial
oppositional portion where the rotatable member and the stationary
member face each other, and
[0056] a cover member for covering the magnetic sensor has
[0057] one or more ring-shaped projections that form a labyrinth in
a path that extends in the radial direction between the rotatable
member and the stationary member.
[0058] According to the above construction, the cover member for
covering the magnetic sensor fixed to the stationary member has the
ring-shaped projection, and this ring-shaped projection forms the
labyrinth in the path that extends in the radial direction between
the stationary member and the rotatable member. This arrangement
accordingly obviates the need for forming an axial lip for sealing
the path in the radial direction on the rotatable member.
Therefore, the axial lip does not become an obstacle in magnetizing
the magnetic ring fixed to the radial portion of the rotatable
member, allowing the manufacturing to be facilitated.
[0059] In one embodiment of the present invention, the seal device
is constructed of a rotatable member and the stationary member,
[0060] the magnetic ring is fixed to the rotatable member, the
magnetic sensor is fixed to the stationary member and
[0061] at least part of the magnetic sensor is arranged in a hole
formed through the stationary member.
[0062] According to the above construction, at least part of the
magnetic sensor is arranged in the hole formed in the stationary
member. This arrangement can promote the space saving and provides
excellent mountability in the case of a small space.
[0063] In one embodiment of the present invention, all seal lips
are fixed to the stationary member to which the magnetic sensor is
fixed.
[0064] According to the above construction, all the seal lips are
fixed to the stationary member to which the magnetic sensor is
fixed, and this simplifies the structure.
[0065] In one embodiment of the present invention, the stationary
member has a removable cover metal fitting, and the magnetic sensor
is mounted on the cover metal fitting.
[0066] According to the above construction, the magnetic sensor is
mounted on the removable cover metal fitting, and this facilitates
the replacement of the magnetic sensor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0067] The present invention will become more fully understood from
the detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus are
not limitative of the present invention, and wherein:
[0068] FIG. 1 is a sectional view of a wheel speed detector
according to a first embodiment of the present invention;
[0069] FIG. 2 is a sectional view of a wheel speed detector
according to a second embodiment of the present invention;
[0070] FIG. 3 is a sectional view of a modification example of the
second embodiment;
[0071] FIG. 4 is a sectional view of a wheel speed detector
according to a third embodiment of the present invention;
[0072] FIG. 5 is a sectional view of a wheel speed detector
according to a fourth embodiment of the present invention;
[0073] FIG. 6 is a sectional view of a wheel speed detector
according to a fifth embodiment of the present invention;
[0074] FIG. 7 is a sectional view showing the structure around the
wheel speed detector of the fifth embodiment;
[0075] FIG. 8 is a sectional view of a wheel speed detector
according to a sixth embodiment of the present invention;
[0076] FIG. 9 is a sectional view of a wheel speed detector
according to a seventh embodiment of the present invention;
[0077] FIG. 10 is a sectional view of a wheel speed detector
according to an eighth embodiment of the present invention;
[0078] FIG. 11 is a sectional view of a wheel speed detector
according to a ninth embodiment of the present invention;
[0079] FIG. 12 is a sectional view of a wheel speed detector
according to a tenth embodiment of the present invention;
[0080] FIG. 13 is a sectional view of a wheel speed detector
according to an eleventh embodiment of the present invention;
[0081] FIG. 14 is a sectional view of a wheel speed detector
according to a twelfth embodiment of the present invention;
[0082] FIG. 15 is a sectional view of a wheel speed detector
according to a thirteenth embodiment of the present invention;
[0083] FIG. 16 is a sectional view of a wheel speed detector
according to a fourteenth embodiment of the present invention;
[0084] FIG. 17 is a sectional view of a wheel speed detector
according to a fifteenth embodiment of the present invention;
[0085] FIG. 18 is a sectional view of a wheel speed detector
according to a sixteenth embodiment of the present invention;
and
[0086] FIG. 19 is a sectional view of a modification example of the
sixteenth embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0087] The present invention will be described in detail below on
the basis of the embodiments thereof shown in the drawings.
First Embodiment
[0088] FIG. 1 shows the wheel speed detector of the first
embodiment of the present invention. The wheel speed detector of
the present first embodiment is integrated into a seal device 5
that seals a space between an inner ring 2 and an outer ring 3 of a
ball bearing 1.
[0089] The seal device 5 is provided with a core bar 6 fixed to an
inner peripheral surface 3A of the outer ring 3 located on the
rotating side and a slinger 7 fixed to an outer peripheral surface
2A of the inner ring 2 located on the stationary side. The core bar
6 has a cylindrical portion 6A that is projecting in the axial
direction from the outer ring 3 and a flange portion 6B that
extends from this cylindrical portion 6A outwardly in the radial
direction. The cylindrical portion 6A is provided with a plurality
of windows 8 at specified intervals in the circumferential
direction, and a seal lip 10 made of a nonmagnetic elastic member
is fixed to the flange portion 6B. The cylindrical portion 6A
constitutes a magnetic ring 9 of the wheel speed detector. Further,
the seal lip 10 has a main lip 10A, an auxiliary lip 10B and an
axial lip 10C. The seal lip 10 has a lid portion 10D that closes
the windows 8 of the cylindrical portion 6A.
[0090] On the other hand, the slinger 7 is constructed of an inner
cylindrical portion 7A, an outer cylindrical portion 7B and a disk
portion 7C that connects the inner cylindrical portion 7A with the
outer cylindrical portion 7B. A magnetic sensor 11 is fixed to the
inner peripheral surface of the inner cylindrical portion 7A. This
magnetic sensor 11 is constructed of a magnet 12, a coil 13 and a
yoke 15. This magnetic sensor 11 faces from inside the cylindrical
portion 6A provided with the windows 8 that constitute the magnetic
ring 9. A signal line 16 is connected to this coil 13. The signal
line 16 is led outwardly in the axial direction through a
cylindrical hole 17 formed in the disk portion 7C of the slinger 7.
A cylindrical connector 18 is fit in the cylindrical hole 17 of the
slinger 7, and the signal line 16 passes through the approximate
center of this connector 18.
[0091] The disk portion 7C of the slinger 7 faces the flange
portion 6B of the core bar 6, and the main lip 10A and the
auxiliary lip 10B fixed to this flange portion 6B are brought in
sliding contact with the disk portion 7C. The axial lip 10C is
brought in sliding contact with the inner peripheral surface of the
outer cylindrical portion 7B of the slinger 7.
[0092] The cylindrical portion 6A of the core bar 6 that
constitutes the magnetic ring 9 and the magnetic sensor 11
constitute the wheel speed detector of the present first
embodiment. The magnetic sensor 11 is covered with a resin 14.
[0093] In the wheel speed detector having the above construction,
the core bar 6 that constitutes the magnetic ring 9 integrally with
the outer ring 3 rotates when the outer ring 3 rotates relative to
the inner ring 2, and a change in magnetic field due to the
rotation of this magnetic ring 9 is detected by the magnetic sensor
11, and a signal that represents the rotating speed is taken out of
the signal line 16. On the other hand, the seal device 5 prevents
water and dust from intruding into the bearing from the outside by
means of the seal lip 10 fixed to the core bar 6 and prevents
lubricant from leaking out of the bearing.
[0094] The wheel speed detector of the present first embodiment is
integrated with the inside of the seal device 5, and the magnetic
ring 9 serves as part (core bar 6) of the seal device 5. This
arrangement can achieve the compacting and reduction in the number
of components and improves the space saving and assembling
workability.
Second Embodiment
[0095] Next, FIG. 2 shows the wheel speed detector of the second
embodiment of the present invention. The present second embodiment
is integrated with the inside of a seal device 23 for sealing a
space between an inner ring 21 and an outer ring 22 of the bearing.
This seal device 23 has a sectionally L-figured ring-shaped
rotating side member 25 fixed to the outer peripheral surface of
the inner ring 21 and a ring-shaped stationary side member 26 fixed
to the inner peripheral surface of the outer ring 22. This
stationary side member 26 is constructed of an outer cylindrical
portion 26A, an inner cylindrical portion 26B and a disk portion
26C extending between both the cylindrical portions. Then, a
sectionally H-figured seal lip 27 having a two-layer structure is
fixed to the leading end of a flange portion 25A of the rotating
side member 25, and this seal lip 27 is brought in sliding contact
with the inner peripheral surface of the outer cylindrical portion
26A of the stationary side member 26. On the other hand, a seal lip
28 is fixed to the leading end of a cylindrical portion 25B of the
rotating side member 25. This seal lip 28 is brought in sliding
contact with the outer peripheral surface of the inner cylindrical
portion 26B of the stationary side member 26.
[0096] On the other hand, a magnetized pulser ring 30 that serves
as a magnetic ring is fixed to the axial outer surface of the
flange portion 25A of the rotating side member 25. A magnetic
sensor 31 is fixed to the inner surface of the disk portion 26C of
the stationary side member 26 and axially faces the magnetized
pulser ring 30. This magnetized pulser ring 30 is formed of a
material obtained by mixing magnetic powder with a rubber or resin
and is magnetized so that a north pole and a south pole are
alternately arranged in the circumferential direction. On the other
hand, the magnetic sensor 31 is constructed of a semiconductor
circuit, and this magnetic sensor 31 is fit in a space between the
outer cylindrical portion 26A and the inner cylindrical portion 26B
of the stationary side member 26 and covered with a resin 32. A
signal line 33 from the magnetic sensor 31 is led axially outwardly
through a hole 34 formed in the disk portion 26C of the stationary
side member 26 and arranged inside a cylindrical connector 37
mounted on an edge 35 of the hole 34 via an O-ring 36.
[0097] The magnetized pulser ring 30 and the magnetic sensor 31
constitute the wheel speed detector of the present embodiment. Even
in the present embodiment, the magnetized pulser ring 30 and the
magnetic sensor 31 are integrated with the inside of the seal
device 23. This arrangement enables the compacting and space saving
and improves the assembling workability. Furthermore, a seal
portion is constructed of the seal lips 27 and 28 on both sides of
a portion where the magnetized pulser ring 30 and the magnetic
sensor 31 face each other. This arrangement can prevent water from
entering inwardly of the magnetic sensor 31 and prevent the
lubricant from leaking out of the bearing.
[0098] In the second embodiment, the magnetized pulser ring 30 and
the magnetic sensor 31 are made to face each other in the axial
direction. However, as shown in FIG. 3, it is acceptable to fix a
magnetic sensor 42 to the inner peripheral surface of a cylindrical
portion 43A elongated in the axial direction of a stationary side
member 43, fix a magnetized pulser ring 41 to the outer peripheral
surface of a cylindrical portion 45A elongated in the axial
direction of a rotating side member 45 and make the magnetized
pulser ring 41 and the magnetic sensor 42 face each other in the
radial direction. Although the magnetized pulser ring is made to
face the very front of the magnetic sensor in the second embodiment
and the embodiments described below, the magnetized pulser ring and
the magnetic sensor may be made to obliquely face each other. There
may be an arrangement such that the magnetized pulser ring and the
magnetic sensor are relatively displaced from the face-to-face
positions to the mutually displaced positions along the plane of
opposition. It was confirmed that the magnetic sensor was able to
detect a magnetic change due to the rotation of the magnetized
pulser ring even in the obliquely displaced positions or the
mutually displaced positions as described above.
Third Embodiment
[0099] Next, FIG. 4 shows the wheel speed detector of the third
embodiment of the present invention. The present third embodiment
is integrated with the inside of a seal device 53 arranged between
an inner ring 51 and an outer ring 52. The inner ring 51 is mounted
around an inner cylinder 50. Then, balls 54 are arranged between
the inner ring 51 and the outer ring 52, while balls 59 are
arranged between the inner cylinder 50 and the outer ring 52.
[0100] The seal device 53 is provided with a rotating side annular
member 55 fixed to the outer peripheral surface of the inner ring
51 located on the rotating side and a stationary side annular
member 57 fixed to the inner peripheral surface of the outer ring
52 located on the stationary side. The rotating side annular member
55 has a sectionally roughly V-figured shape and includes an axial
cylindrical portion 55A and an inclined flange 55B. The stationary
side annular member 57 has an axial cylindrical portion 57A and
inner flanges 57B and 57C located on both ends of the axial
cylindrical portion 57A. A seal lip 58 is fixed to this inner
flange 57C, and this seal lip 58 has an axial lip 58A brought in
sliding contact with the inner peripheral surface of the inclined
flange 55B of the rotating side annular member 55, a main lip 58B
brought in sliding contact with the axial cylindrical portion 55A
of the rotating side annular member 55 and an auxiliary lip
58C.
[0101] A base portion 60A of a wire harness 60 is fixed from the
inner flange 57B of the stationary side annular member 57 to the
axial cylindrical portion 57A. In this base portion 60A is a
resin-molded outer seal lip 61 whose main lip 61A and auxiliary lip
61B are brought in sliding contact with the outer peripheral
surface of the inner ring 51. This base portion 60A has an inclined
surface 62 that faces the inclined flange 55B of the rotating side
annular member 55 at a specified interval, and a magnetic sensor 63
is buried in this inclined surface 62. This magnetic sensor 63 is
constructed of a semiconductor circuit and is connected to a signal
processing circuit 65. A magnetized pulser ring 66 that faces this
magnetic sensor 63 and serves as a magnetic ring is fixed to the
inclined flange 55B. This magnetized pulser ring 66 uses a material
obtained by mixing magnetic powder with a rubber or resin and
magnetized so that a north pole and a south pole are alternately
arranged in the circumferential direction.
[0102] The wheel speed detector constructed of the magnetic sensor
63 and the magnetized pulser ring 66 is integrated with the inside
of the seal device 53, and therefore, the detector is compact and
has good assembling workability. The magnetic sensor 63 and the
magnetized pulser ring 66 face each other obliquely with respect to
the relative axis of rotation of the inner ring 51 and the outer
ring 52, and therefore, the radial dimensions can be reduced,
allowing the compacting to be promoted.
Fourth Embodiment
[0103] Next, FIG. 5 shows the wheel speed detector of the fourth
embodiment of the present invention. This fourth embodiment is
integrated with a seal device 73 arranged between an inner ring 71
and an outer ring 72. It is to be noted that the inner ring 71 is
mounted around a shaft 74. Balls 79 are arranged in a space between
this shaft 74 and the outer ring 72, while balls 70 are arranged in
a space between the inner ring 71 and the outer ring 72.
[0104] This seal device 73 is constructed of a sectionally
bracket-shaped rotating side annular member 76 fixed to the outer
peripheral surface of the inner ring 71 and a sectionally
bracket-shaped stationary side annular member 78 fixed to the inner
peripheral surface of the outer ring 72. This stationary side
annular member 78 is put inside the rotating side annular member 76
with interposition of a specified gap. Seal lips 80 and 81 are
fixed to the radial inner ends 78A and 78B of the stationary side
annular member 78, and the seal lips 80 and 81 are brought in
sliding contact with the cylindrical peripheral surface and the
disk-shaped peripheral surface, respectively, of the rotating side
annular member 76.
[0105] A plurality of windows 82 are formed at specified intervals
in the circumferential direction in the cylindrical portion of the
rotating side annular member 76, forming a magnetic ring 83. A
magnet 85 and a coil 86 are fixed to the inside of the stationary
side annular member 78, forming a magnetic sensor 87. This
stationary side annular member 78 is made of a magnetic material
and plays the role of a yoke (magnetic path) of the magnetic sensor
87.
[0106] The wheel speed detector of the present fourth embodiment,
in which the magnetic ring 83 is constructed of the rotating side
annular member 76 of the seal device 73 and the stationary side
annular member 78 of the seal device 73 concurrently serves as the
yoke (magnetic path) of the magnetic sensor 87, can be reduced in
the number of components, allowing the compacting to be further
promoted.
Fifth Embodiment
[0107] Next, FIG. 6 shows the wheel speed detector of the fifth
embodiment of the present invention. The present fifth embodiment
is integrated with a seal device 93 arranged between an inner ring
91 and an outer ring 92. It is to be noted that the inner ring 91
is arranged adjacently in two lines in the axial direction as shown
in FIG. 7 where balls 94 are arranged between the inner ring 91 and
the outer ring 92. A seal device 99 having a structure similar to
that of the seal device 93 is arranged axially on the opposite side
of the seal device 93.
[0108] The seal device 93 is provided with a sectionally L-figured
annular slinger 95 fixed to the outer peripheral surface of the
inner ring 91 and another sectionally L-figured annular slinger 96
fixed to the axial inside portion 95A of this slinger 95. These two
slingers 95 and 96 constitute a rotating side member 97. The seal
device 93 has an annular core bar 98 that serves as a stationary
side member fixed to the inner peripheral surface of the outer ring
92. This annular core bar 98 is constructed of a bent portion 100
that is projecting outwardly in the axial direction and a
projecting portion 101 that is projecting inwardly in the radial
direction. A resin portion 102 that fills the inside of this bent
portion 100 and forms a resin portion 102 along the projecting
portion 101, and a magnetic sensor 103 is molded in this resin
portion 102. A signal line 104 is connected to this magnetic sensor
103, and this signal line 104 is connected to a harness 109 fixed
to the outer peripheral surface of the bent portion 100 of the core
bar 98.
[0109] Then, a magnetic ring 105 is fixed to a radial portion 96A
of the slinger 96 so as to face this magnetic sensor 103. On the
other hand, a seal lip 106 is fixed to the projecting portion 101
of the core bar 98. This seal lip 106 has a main lip 106A and an
auxiliary lip 106B located axially inside this main lip 106A. This
main lip 106A and the auxiliary lip 106B are brought in sliding
contact with the axial portion 95A of the slinger 95.
[0110] Further, the seal lip 106 is provided with an axial lip 106C
that extends obliquely in the axial direction radially outwardly of
the main lip 106A. This axial lip 106C obliquely extends outwardly
in the axial direction and outwardly in the radial direction and is
brought in sliding contact with a radial portion 95B of the slinger
95.
[0111] In the wheel speed detector of the present fifth embodiment,
the magnetic ring 105 and the magnetic sensor 103 are integrated
with the inside of the seal device 93. This arrangement enables the
compacting and space saving and improves the assembling
workability. Furthermore, the waterproof performance can be
improved since the slingers 95 and 96 and the core bar 98
constitute the labyrinth structure and the seal lip 106 extending
from the core bar 98 is brought in sliding contact with the slinger
95 by the three lips of the main lip 106A, the auxiliary lip 106B
and the axial lip 106C.
Sixth Embodiment
[0112] Next, FIG. 8 shows the wheel speed detector of the sixth
embodiment of the present invention. The present sixth embodiment
is integrated with a seal device 113 arranged between an inner ring
111 and an outer ring 112. This seal device 113 is provided with a
sectionally roughly inverted L-figured core bar 115 fixed to the
inner peripheral surface of the outer ring 112 located on the
rotating side and a sectionally roughly L-figured slinger 116 fixed
to the inner ring 111 located on the stationary side. The core bar
115 and the slinger 116 have oppositional portions 115A and 116A
that face each other in the axial direction. A magnetized pulser
ring 117 that serves as a magnetic ring is fixed to the
oppositional portion 115A of this core bar 115. A seal lip 118
constructed of a nonmagnetic elastic member is fixed to the
oppositional portion 115A of this core bar 115 so as to cover the
magnetized pulser ring 117. This seal lip 118 is provided with an
auxiliary lip 118A, a main lip 118B and an axial lip 118C. The
auxiliary lip 118A and the main lip 118B are brought in sliding
contact with a cylindrical portion 116B of the slinger 116, and the
axial lip 118C is brought in sliding contact with the oppositional
portion 116A of the slinger 116. This axial lip 118C extends
outwardly in the axial direction and outwardly in the radial
direction from the root portion to the leading end portion.
[0113] On the other hand, a magnetic sensor 120 is fixed to the
outer surface of the oppositional portion 116A of the slinger 116.
This magnetic sensor 120 is covered with a resin mold that
constitutes a mold portion 121. This mold portion 121 forms a
labyrinth 122 oppositional to an axial end surface 115C of the core
bar 115 and an axial end surface 112A of the outer ring 112. The
mold portion 121 has an inclined surface 121A that inclines
relative to a plane perpendicular to the axis of the rotary shaft,
and this inclined surface 121A serves as a surface for leading a
signal line 123 from the magnetic sensor 120. This inclined surface
121A is upslope from the outside toward the inside in the axial
direction.
[0114] In the present sixth embodiment, the magnetized pulser ring
117 is covered with the seal lip 118 constructed of the nonmagnetic
elastic member, and accordingly, there is formed no such bridge
that might connect the south pole with the adjacent north pole due
to the adhesion of iron powder or the like to the magnetized pulser
ring 117. Therefore, the magnetic noise can be reduced and the
rotating speed detection accuracy can be improved. Further, in this
sixth embodiment, a labyrinth 122 is formed of a mold portion 121
in addition to the three lips 118A, 118B and 118C owned by the seal
lip 118, and therefore, the waterproof performance can be improved.
Further, in the present sixth embodiment, the slinger 116 for
fixing the magnetic sensor 120 is made nonmagnetic with a material
of austenite-based stainless steel, and therefore, the magnetic
detection accuracy of the magnetic sensor 120 can be improved.
Further, in the present sixth embodiment, a signal line 123 can be
led out of the inclined surface 121A owned by the mold portion
121.
Seventh Embodiment
[0115] Next, FIG. 9 shows the wheel speed detector of the seventh
embodiment of the present invention. The present seventh embodiment
differs from the sixth embodiment shown in FIG. 8 in that the
magnetized pulser ring 117 is fixed to an inner surface 115A-1 of
the oppositional portion 115A of the core bar 115. In the present
sixth embodiment, the magnetized pulser ring 117 is fixed to the
inner surface 115A-1 of the oppositional portion 115A of the core
bar 115. With this arrangement, the pulser ring 117 that is made of
a material obtained by mixing magnetic powder with a rubber or
resin and put in a non-magnetized state can be magnetized axially
from inside. Therefore, the axial lip 118C does not become an
obstacle during the magnetization.
[0116] In the present seventh embodiment, the core bar 115 is made
of a magnetic material, and therefore, the magnetic force of the
pulser ring 117 can be increased.
Eighth Embodiment
[0117] Next, FIG. 10 shows the wheel speed detector of the eighth
embodiment of the present invention. The present eighth embodiment
is integrated with a seal device 133 arranged between an inner ring
131 and an outer ring 132. This seal device 133 is provided with a
core bar 135 that serves as a stationary side member and is fixed
to the inner peripheral surface of the outer ring 132 located on
the stationary side and a slinger 136 that serves as a rotating
side member and is fixed to the outer peripheral surface of the
inner ring 131 located on the rotating side.
[0118] The core bar 135 is provided with a cylindrical portion
135A, an outer flange 135B and an inner flange 135C that extend in
the radial direction from both axial ends of this cylindrical
portion 135A. A seal lip 137 having a main lip 137A and a first
auxiliary lip 137B is fixed to the leading end of this inner flange
135C. On the other hand, the slinger 136 is constructed of a disk
portion 136A and an outer cylindrical portion 136B and an inner
cylindrical portion 136C that extend axially inwardly from both
radial ends of this disk portion 136A. The main lip 137A and the
first auxiliary lip 137B of the seal lip 137 are brought in sliding
contact with the inner cylindrical portion 136C of this slinger
136. A seal lip 138 is fixed to the outer cylindrical portion 136B
of the slinger 136. This seal lip 138 has an axial lip 140 brought
in sliding contact with the inner flange 135C of the core bar 135
and a fourth lip 141 located axially outside this axial lip 140.
This seal lip 138 covers a magnetized pulser ring 142 fixed to the
inner surface of the outer cylindrical portion 136B of the slinger
136.
[0119] On the other hand, a magnetic sensor 143 is fixed to the
cylindrical portion 135A of the core bar 135, and this magnetic
sensor 143 is buried in a resin portion 145 that serves as a cover
member. A fourth lip 141 of the seal lip 138 is brought in sliding
contact with this resin portion 145. The resin portion 145 has an
axial end portion 145A that closely fit to the outer flange 135B of
the core bar 135, and this axial end portion 145A has an inclined
surface 146 that is inclined relative to the axis of rotation. This
inclined surface 146 is upslope from the outside toward the inside
in the axial direction, and a harness 147 is projecting from this
inclined surface 146. This harness 147 is connected to a signal
line 148 extending from the magnetic sensor 143.
[0120] In the wheel speed detector of the present eighth
embodiment, a magnetized pulser ring 142 and a magnetic sensor 143
face each other in the radial direction, and therefore, the axial
dimensions can be reduced to enable the compacting in the axial
dimension. Further, the present eighth embodiment is provided with
a second auxiliary lip 141 located outside the axial lip 140 in
addition to the main lip 137A, the auxiliary lip 137B and the axial
lip 140, and therefore, the sealing performance can be improved. In
particular, the second auxiliary lip 141 prevents muddy water from
directly splashing on the axial lip 140, and therefore, an improved
muddy water resistance can be achieved. Further, in the present
eighth embodiment, the second auxiliary lip 141 is fixed to the
slinger 136 fixed to the inner ring 131 located on the rotating
side, and therefore, a centrifugal force in the rotating stage
presses the second auxiliary lip 141 against the core bar 135
(cylindrical inner peripheral surface 144 of the resin portion 145)
located radially outside. Therefore, the sealing performance during
rotation can be improved. In the present eighth embodiment, the
harness 147 is projecting from the inclined surface 146 of the
resin portion 145 that covers the magnetic sensor 143, and
therefore, the harness outlet width can be widened. In the present
eighth embodiment, the magnetized pulser ring 142 is completely
covered with the seal lip 138 and placed inside the seal portion
constructed of the seal lip 137 and the seal lip 138. This removes
the concern about the adhesion of a magnetic foreign material to
the magnetized pulser ring 142 and restrains the occurrence of
noises, thereby allowing a correct speed detection to be
achieved.
Ninth Embodiment
[0121] Next, FIG. 11 shows the wheel speed detector of the ninth
embodiment of the present invention. The present ninth embodiment
is integrated with a seal device 153 arranged between an inner ring
151 and an outer ring 152. This seal device 153 is provided with a
sectionally roughly inverted L-figured core bar 155 fixed to the
inner peripheral surface of the outer ring 152 located on the
rotating side and a sectionally reversed L-figured slinger 156
fixed to the inner ring 151 located on the stationary side. The
core bar 155 and the slinger 156 have respective oppositional
portions 155A and 156A that face each other in the axial direction.
A magnetized pulser ring 157 that serves as a magnetic ring is
fixed to the oppositional portion 155A of this core bar 155. A seal
lip 158 constructed of a nonmagnetic elastic member is fixed to the
oppositional portion 155A of this core bar 115 so as to cover the
magnetized pulser ring 157. This seal lip 158 has a main lip 158A
and an auxiliary lip 158B that are brought in sliding contact with
a cylindrical portion 156B of the slinger 156.
[0122] On the other hand, a magnetic sensor 160 is fixed to the
inner surface of the oppositional portion 156A of the slinger 156,
and this magnetic sensor 160 is completely covered with a resin
portion 161 in which the slinger 156 is molded. This resin portion
161 has an annular inner diameter side projection 162 and an
annular outer diameter side projection 163 that are projecting
axially inwardly from the front surface of the magnetic sensor 160
toward the magnetized pulser ring 157. The projection 162 and the
projection 163 constitute a labyrinth 165 between the projections
and a thin portion 158C of the seal lip 158 that covers the
magnetized pulser ring 157.
[0123] According to the present ninth embodiment, the resin portion
161 that covers the magnetic sensor 160 fixed to the slinger 156
has ring-shaped projections 162 and 163, and these ring-shaped
projections 162 and 163 form the labyrinth 165 in a path that
extends in the radial direction between the core bar 155 and the
slinger 156. This obviates the need for forming the axial lip for
radially sealing the path on the core bar 155. Therefore, the axial
lip does not become an obstacle in magnetizing the magnetic pulser
ring 157 to be fixed to the oppositional portion (radial portion)
155A of the core bar 155, allowing the manufacturing to be
facilitated.
[0124] The point that this resin portion 161 can widen the harness
outlet width by virtue of the inclined surface 161A located at the
axial end is similar to those of the aforementioned sixth and
seventh embodiments shown in FIG. 8 and FIG. 9.
[0125] In the aforementioned embodiment, the magnetized pulser ring
157 is fixed to the axial outer surface of the oppositional portion
155A of the core bar 155. However, as indicated by the one-dot
chain lines, the magnetized pulser ring 157 may be fixed to the
axial inner surface of the oppositional portion 155A.
Tenth Embodiment
[0126] Next, FIG. 12 shows the wheel speed detector of the tenth
embodiment of the present invention. The present tenth embodiment
is integrated with a seal device 173 arranged between an inner ring
171 and an outer ring 172. This seal device 173 is provided with a
sectionally inverted L-figured slinger 175 that serves as a
rotating side member fixed to the inner peripheral surface of the
outer ring 172 located on the rotating side and a sectionally
L-figured core bar 176 that serves as a stationary side member
fixed to the outer peripheral surface of the inner ring 171 located
on the stationary side.
[0127] The sectionally L-figured core bar 176 is provided with a
cylindrical portion 176A and a flange portion 176B that radially
extends from the axial outer end of this cylindrical portion 176A.
This flange portion 176B has an axial through hole 177, and a
magnetic sensor 178 is fit in this axial through hole 177. Then, a
seal lip 180 is fixed to the core bar 176 so as to cover this
magnetic sensor 178. This seal lip 180 is provided with a main lip
180A, an auxiliary lip 180B and an axial lip 180C. This axial lip
180C obliquely extends inwardly in the axial direction and
outwardly in the radial direction from the root portion toward the
leading end. The main lip 180A and the auxiliary lip 180B are
brought in sliding contact with a cylindrical portion 175A of the
sectionally inverted L-figured slinger 175, while the axial lip
180C is brought in sliding contact with a flange portion 175B of
the sectionally inverted L-figured slinger 175.
[0128] A magnetized pulser ring 181 that serves as a magnetic ring
is fixed to the axial outer surface of the flange portion 175B of
the sectionally inverted L-figured slinger 175 so as to face the
magnetic sensor 178.
[0129] The magnetized pulser ring 181 and the magnetic sensor 178
constitute the wheel speed detector of the present tenth
embodiment. A signal line 182 is connected to the radial inner end
surface of this magnetic sensor 178, and this signal line 182 is
buried in a resin portion 183 fixed to the end surface of the core
bar 176 and extends outwardly in the axial direction and outwardly
in the radial direction.
[0130] In the present tenth embodiment, part of the magnetic sensor
178 is arranged inside the axial through hole 177 formed through
the core bar 176. This arrangement can promote the space saving and
provides excellent mountability in the case of a small space. In
the present tenth embodiment, all the seal lips (main lip 180A,
auxiliary lip 180B and axial lip 180C) are fixed to the core bar
176 to which the magnetic sensor 178 is fixed, and therefore, the
structure becomes simple.
Eleventh Embodiment
[0131] Next, FIG. 13 shows the wheel speed detector of the eleventh
embodiment of the present invention. The present eleventh
embodiment is constructed of a magnetic sensor 193 and a magnetized
pulser ring 203 and integrated with the inside of a seal device 187
arranged between an inner ring 185 and an outer ring 186. This seal
device 187 is provided with a sectionally inverted L-figured core
bar 188 fixed to the inner peripheral surface of the outer ring 186
located on the stationary side and a sectionally reversed L-figured
slinger 191 fixed to the outer peripheral surface of the inner ring
185 located on the rotating side. The seal device 187 is further
provided with an inverted L-figured metal fitting 192 fixed in an
overlapping manner to a cylindrical portion 188A of the core bar
188. A magnetic sensor 193 is fixed to the inner surface of an
axial end radial portion 192A of this inverted L-figured metal
fitting 192, and this magnetic sensor 193 is covered with a resin
194. A signal line 195 extending from this magnetic sensor 193
extends obliquely outwardly inside a resin portion 197 through a
hole 196 formed through a cylindrical portion 192B of the inverted
L-figured metal fitting 192. This resin portion 197 is fixed to the
L-figured metal fitting 192 and extends obliquely outwardly.
[0132] A second auxiliary lip 200 is fixed to an inner end 198 bent
inwardly of the radial portion 192A of this inverted L-figured
metal fitting 192. This second auxiliary lip 200 is externally
brought in sliding contact with a flange portion 191A of the
slinger 191.
[0133] On the other hand, a main lip 201 and a first auxiliary lip
202 are fixed to the inner end of an inner flange 188b of the core
bar 188, and this main lip 201 and the first auxiliary lip 202 are
brought in sliding contact with a cylindrical portion 191B of the
slinger 191. A leading end portion 191A-1 of the flange portion
191A of this slinger 191 is bent inward, and a magnetized pulser
ring 203 that serves as a magnetic ring is fixed to the inner
surface of this leading end portion 191A-1. An axial lip 205
constructed of a nonmagnetic elastic member is fixed to the
magnetized pulser ring 203 so as to cover the magnetized pulser
ring 203, and this axial lip 205 is brought in sliding contact with
the inner flange 188B of the core bar 188.
[0134] The wheel speed detector of the present eleventh embodiment
is protected from an external impact such as a kicked stone by the
inverted L-figured metal fitting 192. Both the magnetic sensor 193
and the magnetized pulser ring 203 are covered with the resin 194
constructed of a nonmagnetic member and the axial lip 205 so as to
be protected from moisture and dust. The inverted L-figured metal
fitting 192 and the slinger 191 constitute a labyrinth 206, and a
sealing performance is improved by the existence of the added
second auxiliary lip 200 provided for the inverted L-figured metal
fitting 192.
Twelfth Embodiment
[0135] Next, FIG. 14 shows the wheel speed detector of the twelfth
embodiment of the present invention. The present twelfth embodiment
is constructed of a magnetic sensor 211 fixed to a sectionally
step-shaped stationary side member 215 and a magnetized pulser ring
212 fixed to a sectionally step-shaped rotating side member
216.
[0136] The stationary side member 215 is fixed to the outer
peripheral surface of an outer ring 217, bent inward along the end
surface and then extended in the axial direction. The rotating side
member 216 is fixed to the outer peripheral surface of an inner
ring 218, bent radially outwardly and extended in the axial
direction so as to face the stationary side member 215 with
interposition of a specified gap. The stationary side member 215
and the rotating side member 216 face each other in the respective
oppositional portions 215A and 216A. A magnetic sensor 211 is fixed
to the outer peripheral surface of this oppositional portion 215A,
and a magnetized pulser ring 212 is fixed to the inner peripheral
surface of the oppositional portion 216A.
[0137] The magnetic sensor 211 is completely covered with a resin
portion 223 fixed to the stationary side member 215. This resin
portion 223 has a connecting portion 223A that is projecting
obliquely in the axial direction.
[0138] The magnetized pulser ring 212 is covered with a cover 220
constructed of a nonmagnetic elastic member, and this cover 220 has
a seal lip 220A brought in sliding contact with the oppositional
portion 215A of the stationary side member 215. A core bar 221 is
fixed to the inner peripheral surface of the outer ring 217, and a
seal lip 222 is fixed to a flange 221A of this core bar 221. This
seal lip 222 has a main lip 222A, a first auxiliary lip 222B and an
axial lip 222C. The main lip 222A and the first auxiliary lip 222B
are brought in sliding contact with a cylindrical portion 216B of
the rotating side member 216. The axial lip 222C is brought in
sliding contact with a flange portion 216C of the rotating side
member 216.
[0139] The wheel speed detector of the present twelfth embodiment
is constructed of the magnetic sensor 211 and the pulser ring 212
and is integrated with a seal device constructed of the stationary
side member 215, rotating side member 216, core bar 221 and seal
lips 222 and 220A. This arrangement can simplify the overall
structure and reduce the number of components. The magnetic sensor
211 and the pulser ring 212 are completely covered with the resin
portion 223 and the cover 220, and therefore, the external
influence of a foreign material can be avoided. The mixture of a
foreign material into the sensor portion can be prevented by the
second auxiliary lip 220A.
Thirteenth Embodiment
[0140] Next, FIG. 15 shows the wheel speed detector of the
thirteenth embodiment of the present invention. The present
thirteenth embodiment is constructed of a magnetized pulser ring
231 and a magnetic sensor 232 that face each other in the axial
direction. The magnetized pulser ring 231 is fixed to a core bar
233 and covered with a thin film 235 constructed of a nonmagnetic
elastic member continued from a seal lip 234. The magnetic sensor
232 is fixed to a slinger 236 and is covered with a nonmagnetic
thin film 238 continued from a resin portion 237.
[0141] The core bar 233 has a disk portion 233A that extends
radially inwardly at the axial inner end, and a seal lip 234 is
fixed to this disk portion 233A. This seal lip 234 has the three
lips of a main lip 234A, an auxiliary lip 234B and an axial lip
234C. The main lip 234A and the auxiliary lip 234B are brought in
sliding contact with a cylindrical portion 236A of the slinger 236,
while the axial lip 234C is brought in sliding contact with a
flange portion 236B of the slinger 236.
[0142] On the other hand, a resin portion 237 fixed to the slinger
236 has an annular projection 237A that faces the inner peripheral
surface of an outer peripheral wall 233B of the core bar 233, and
this annular projection 237A forms a labyrinth between the annular
projection 237A and the outer peripheral wall 233B. Further, a
harness 240 is projecting from an axial end surface 237B of the
resin portion 237.
[0143] Then, a cylindrical portion 236A of the slinger 236 is fixed
to an inner ring 241, and a cylindrical portion 233C of the core
bar 233 is fixed to an outer ring 242.
[0144] The core bar 233, the slinger 236, the seal lip 234 and the
annular projection 237A of the resin portion 237 constitute a seal
device.
[0145] In the wheel speed detector of the present thirteenth
embodiment, the magnetized pulser ring 231 and the magnetic sensor
232 are integrated with the inside of the seal device. This enables
the compacting and space saving and improves the assembling
workability.
[0146] Further, the annular projection 237A fixed to the slinger
236 and the outer peripheral wall 233B of the core bar 233
constitute the labyrinth structure. This arrangement can prevent
the external foreign material from entering the portion where the
magnetic sensor 232 and the pulser ring 231 face each other and
avoid the influence of the foreign material on the signal. The
pulser ring 231 is covered with the thin film 235 made of a
nonmagnetic elastic member, and the magnetic sensor 232 is covered
with the nonmagnetic thin film 238 connected to the resin portion
237. Therefore, the waterproof performance can be improved.
Fourteenth Embodiment
[0147] Next, FIG. 16 shows the wheel speed detector of the
fourteenth embodiment of the present invention. The present
fourteenth embodiment is integrated with the inside of a seal
device 247 for sealing a gap between a rotating side inner ring 245
and a stationary side outer ring 246.
[0148] This seal device 247 is provided with a core bar 248 fixed
to the outer ring 246 and a slinger 250 fixed to the inner ring
245. A seal lip 251 is fixed to an inner diameter portion 248A of a
core bar 248. This seal lip 251 is provided with a main lip 251A
and a first auxiliary lip 251B brought in sliding contact with a
cylindrical portion 250A of the slinger 250 and an axial lip 251C
brought in sliding contact with a disk portion 250B of the slinger
250.
[0149] The core bar 248 is provided with a bent portion 248B that
is bent along a corner 246A of the outer ring 246 and an outer
peripheral portion 248C that extends axially outwardly from a
radial end of this bent portion 248B. A removable cover metal
fitting 252 is mounted on the inside of the outer peripheral
portion 248C of this core bar 248. A magnetic sensor 256 is fixed
to a resin 254 filled inside this cover metal fitting 252. This
cover metal fitting 252 is provided with a radial portion 252A bent
radially inwardly from the outer peripheral portion 248C, and a
second auxiliary lip 253 is fixed to an end of this radial portion
252A. This second auxiliary lip 253 is brought in sliding contact
with an axial portion 250C of the slinger 250. This cover metal
fitting 252 is fixed to the core bar 248 by a calking portion 255
formed in the outer peripheral portion 248C of the core bar 248. By
releasing the calking of this calking portion 255, the cover metal
fitting 252 can be removed from the core bar 248 by being slid in
the axial direction. A hole 258 through which a signal line 257
extending from the magnetic sensor 256 extends is formed through
this cover metal fitting 252. This signal line 257 is led obliquely
outwardly in the axial direction and is buried in a resin portion
259 fixed to the radial portion 252A of the cover metal fitting
252.
[0150] A magnetized pulser ring 260 of the present fourteenth
embodiment is fixed to an axial portion 250C of the slinger 250 and
made to face the magnetic sensor 256. The wheel speed detector of
the present fourteenth embodiment, in which the magnetic sensor 256
and the pulser ring 260 are integrated with the inside of the seal
device 247, can be compacted, allowing the mounting work to be
simplified. The magnetic sensor 256 is mounted on the removable
cover metal fitting 252 according to this wheel speed detector, and
therefore, the magnetic sensor 256 can be easily replaced. The
second auxiliary lip 253 can prevent the foreign material from
entering a portion where the pulser ring 260 and the magnetic
sensor 256 face each other.
Fifteenth Embodiment
[0151] Next, FIG. 17 shows the wheel speed detector of the
fifteenth embodiment of the present invention. The present
fifteenth embodiment is integrated with the inside of a seal device
263 for sealing a gap between a rotating side outer ring 261 and a
stationary side inner ring 262.
[0152] This seal device 263 is provided with a core bar 265 fixed
to a corner 261A located on the inner diameter side of the outer
ring 261 and a slinger 266 fixed to the inner peripheral surface of
the inner ring 262. A seal lip 267 is fixed to the inner end of an
inner diameter portion 265A of the core bar 265. This seal lip 267
is provided with a main lip 267A, an auxiliary lip 267B and an
axial lip 267C. The main lip 267A and the first auxiliary lip 267B
are brought in sliding contact with an inside axial portion 266A of
a slinger 266, while an axial lip 267C is brought in sliding
contact with a disk portion 266B of the slinger 266.
[0153] The core bar 265 has an outside axial portion 265B, and a
cover metal fitting 268 is fixed to the inner side of the outside
axial portion 265B by a calking portion 270 of this outside axial
portion 265B. This cover metal fitting 268 is constructed of an
axial portion 268A and a radial portion 268B that is bent inward in
the radial direction. A magnetized pulser ring 271 is fixed to the
inside of this axial portion 268A, and a second auxiliary lip 272
is fixed to an end of the radial portion 268B. This second
auxiliary lip 272 is brought in sliding contact with an axial end
of an outer axial portion 266C of the slinger 266.
[0154] A magnetic sensor 273 is fixed to the outer axial portion
266C of this slinger 266 so as to face the magnetized pulser ring
271. This magnetic sensor 273 is covered with a resin layer 275,
and a signal line 276 extending from the magnetic sensor 273 is led
radially inwardly through a hole 277 formed through the outer axial
portion 266C. This signal line 276 is connected to a harness 278
that extends in the circumferential direction, and this harness 278
is buried in a resin portion 280 fixed to the disk portion 266B and
the outer axial portion 266C of the slinger 266.
[0155] The wheel speed detector of the present fifteenth
embodiment, in which the harness 278 connected to the signal line
276 extending from the magnetic sensor 273 is buried in the resin
portion 280 fixed to the disk portion 266B and the axial portion
266C of the slinger 266 and led in the circumferential direction,
can assure the strength of the root portion of the harness 278. The
cover metal fitting 268 is removably fixed to the core bar 265 by
the calking portion 270 of the core bar 265. This arrangement can
simplify the replacement of the magnetized pulser ring 271 fixed to
the cover metal fitting 268. The second auxiliary lip 272 mounted
on the cover metal fitting 268 can prevent the foreign material
from entering the sensor portion.
Sixteenth Embodiment
[0156] Next, FIG. 18 shows the wheel speed detector of the
sixteenth embodiment of the present invention. The present
sixteenth embodiment is integrated with the inside of a seal device
283 for sealing a gap between a rotating side outer ring 281 and a
stationary side inner ring 282.
[0157] This seal device 283 is provided with a core bar 285 fixed
to the inner peripheral surface of the outer ring 281 as well as a
first slinger 286 and a second slinger 287 that are fixed to the
outer peripheral surface of the inner ring 282. The core bar 285 is
provided with a radial portion 285A, and a seal lip 288 is fixed to
the radial portion 285A. This seal lip 288 has a main lip 288A and
an auxiliary lip 288B that are brought in sliding contact with a
cylindrical portion 286A of the first slinger 286 and an axial lip
288C brought in sliding contact with a radial portion 286B of the
first slinger 286.
[0158] On the other hand, the second slinger 287 is fixed to the
axial end of the outer peripheral surface of the inner ring 282 and
is provided with a radial portion 287A that extends radially
outwardly and an axial portion 287B that extends axially inwardly.
A magnetic sensor 290 is fixed to the inner surface of this radial
portion 287A, and this magnetic sensor 290 is covered with a resin
portion 291. A signal line 292 extending from this magnetic sensor
290 is led obliquely outwardly in the axial direction through a
hole 293 formed through the axial portion 287B and buried in the
resin portion 291 that is projecting obliquely outwardly in the
axial direction. An annular projection 296 that faces the outer
peripheral surface of the outer ring 281 with interposition of a
slight gap in the circumferential direction is fixed to the inner
surface of the axial portion 287B of the second slinger 287.
[0159] A magnetized pulser ring 297 is fixed to an axial end
surface 281A of the outer ring 281 so as to face the magnetic
sensor 290.
[0160] The present sixteenth embodiment, in which the magnetized
pulser ring 297 is made to directly adhere to the outer ring 281
located on the rotating side, has a simple structure and a reduced
number of components. The annular projection 296 formed on the
second slinger 287 forms the labyrinth structure and is able to
prevent water and dust from entering the magnetized pulser ring
297.
[0161] In the present sixteenth embodiment, the magnetic sensor 290
is fixed to the inner surface of the radial portion 287A of the
second slinger 287. However, as shown in FIG. 19, the magnetic
sensor 290 may be fixed to the outer surface of the radial portion
287A. In this case, the second slinger 287 can be put close to the
outer ring 281, allowing the compacting to be achieved.
[0162] The invention being thus described, it will be obvious that
the same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications as would be obvious to one skilled in
the art are intended to be included within the scope of the
following claims.
* * * * *