Title: Rolling bearing apparatus
Abstract: A rolling bearing apparatus includes a sensor cover capable of avoiding a pulser ring from being damaged by the sensor cover with excellent positional accuracy relative to the pulser ring or the like. The rolling bearing apparatus includes a structure in which whereas an outer peripheral edge of a sensor main body of a sensor cover is folded to bend to an inner side of a bearing and a conical portion as a fitting portion is formed at a folded to bend portion thereof, a conical portion as a fitted portion for fitting the fitting portion is formed at an inner peripheral surface of an outer ring and a position in an axial direction of the sensor cover relative to a pulser ring is set to position by fitting the two conical portions.
Patent Number: 6,997,615 Issued on 02/14/2006 to Takada
| Inventors:
|
Takada; Yoshito (Nara, JP)
|
| Assignee:
|
Koyo Seiko Co., Ltd. (Osaka, JP)
|
| Appl. No.:
|
738128 |
| Filed:
|
December 18, 2003 |
Foreign Application Priority Data
| Dec 20, 2002[JP] | P. 2002-370699 |
| Current U.S. Class: |
384/448 |
| Current Intern'l Class: |
F16C 19/28 (20060101) |
| Field of Search: |
324/173,174,207.25
384/448,446
|
References Cited [Referenced By]
U.S. Patent Documents
| 5148104 | Sep., 1992 | Ishikawa.
| |
| 5296805 | Mar., 1994 | Clark et al.
| |
| 5372435 | Dec., 1994 | Genero et al.
| |
| 5470157 | Nov., 1995 | Dougherty et al.
| |
| 5550467 | Aug., 1996 | Goossens.
| |
| 5670874 | Sep., 1997 | Miyazaki et al.
| |
| 5873658 | Feb., 1999 | Message et al.
| |
| 6457869 | Oct., 2002 | Smith et al.
| |
| 6692153 | Feb., 2004 | Ohtsuki et al.
| |
| Foreign Patent Documents |
| 2000/-211311 | Aug., 2000 | JP.
| |
Primary Examiner: Hannon; Thomas R.
Attorney, Agent or Firm: McGinn IP Law Group, PLLC
Claims
What is claimed is:
1. A rolling bearing apparatus comprising:
a rotating ring comprising a flange for supporting a wheel;
a fixed ring which is supported on an outer diameter side of the rotating ring
concentrically with the rotating ring and is not rotated;
a plurality of rolling members rollably provided between the rotating ring and
the fixed ring;
a pulser ring which is installed at an outer peripheral surface on one end side
in an axial direction of the rotating ring and a magnetic property of which is
changed alternately in a circumferential direction;
a sensor cover made of a nonmagnetic material installed to an inner peripheral
surface on one end side in an axial direction of the fixed ring by making one face
thereof proximate to the pulser ring and closing a ring-like space between the
fixed ring and the rotating ring; and
a sensor supported by at least one of the fixed ring and a portion of a vehicle
body is proximate to or brought into contact with another face of the sensor cover
to be opposed to the pulser ring in the axial direction via the sensor cover,
wherein an outer peripheral edge of the sensor cover comprises a folded portion
folded to an inner side of a bearing and a fitting portion formed at least at a
portion of the folded portion,
wherein a fitted portion for fitting the fitting portion is formed at a predetermined
position of an inner peripheral surface of the fixed ring, and
wherein a position in the axial direction of the sensor cover relative to the
pulser ring is set to position by fitting the fitting portion of the sensor cover
to the fitted portion of the fixed ring.
2. The rolling bearing apparatus according to claim 1, wherein the fitting portion
comprises a structure of a taper face in a ring-like shape, a diameter of which
is gradually reduced in a fitting direction, and
wherein the fitted portion comprises a structure of a taper face in a ring-like
shape, a diameter of which is gradually reduced in the fitting direction.
3. The rolling bearing apparatus according to claim 1, wherein the fitting portion
comprises a projected portion in a ring-like shape, and
wherein the fitted portion comprises a groove in a ring-like shape fitted with
the projected portion.
4. The rolling bearing apparatus according to claim 1, wherein said sensor cover
is disposed at a constant position that does not hamper detection of said pulser ring.
5. The rolling bearing apparatus according to claim 1, wherein the pulser ring
is arranged at ends of the fixed ring and the rotating ring.
6. The rolling bearing apparatus according to claim 1, wherein said pulser ring comprises:
a support ring attached to a portion of the outer peripheral surface of said
rotating ring; and
a magnet attached to said support ring.
7. The rolling bearing apparatus according to claim 1, wherein said sensor is
attached to said vehicle body in a state in which a central position thereof for
carrying out a detection and a magnetic field generating portion of the pulser
ring coincide with each other in a diameter direction.
8. The rolling bearing apparatus according to claim 1, wherein said folded portion comprises:
a conical portion as a fitting portion having a ring-like structure, a diameter
of which is gradually reduced in a fitting direction; and
a cylindrical portion as a contacting portion having a constant diameter in the
fitting direction.
9. The rolling bearing apparatus according to claim 1, wherein said sensor cover
comprises a main body that covers said fixed ring and a caulking portion for caulking
said fixed ring to said flange.
10. The rolling bearing apparatus according to claim 1, wherein said folded portion
is press-fitted to an inner peripheral surface of said rotating ring.
11. The rolling bearing apparatus according to claim 1, wherein a diameter of
said folded portion of said sensor cover is larger than an inner diameter of the
inner peripheral surface of the rotating ring.
12. The rolling bearing apparatus according to claim 1, wherein the inner peripheral
surface of the outer ring comprises a smaller diameter portion, a contacted portion,
and a large diameter portion, as said fitted portion,
wherein an interval between the smaller diameter portion and the large diameter
portion comprises a stepped difference portion.
13. The rolling bearing apparatus according to claim 1, wherein said folded portion
comprises a small diameter fitting portion as a contacting portion and a large
diameter cylinder portion as a fitting portion.
14. The rolling bearing apparatus according to claim 1, wherein said folded portion
comprises a projection at a central portion of a width of the folded portion.
15. The rolling bearing apparatus according to claim 1, wherein by fitting the
fitting portion of the sensor cover to the fitted portion of the fixed ring, the
position in the axial direction of the sensor cover relative to the pulser ring
is set to the position where the sensor cover does not interfere with a detection
of the pulser ring.
16. A rolling bearing apparatus comprising:
a rotating ring comprising a flange for supporting a wheel;
a fixed ring which is supported on an outer diameter side of the rotating ring
concentrically with the rotating ring and is not rotated;
a plurality of rolling members rollably provided between the rotating ring and
the fixed ring;
a pulser ring which is installed at an outer peripheral surface on one end side
in an axial direction of the rotating ring and a magnetic property of which is
changed alternately in a circumferential direction;
a sensor cover made of a nonmagnetic material installed to an inner peripheral
surface on one end side in an axial direction of the fixed ring by making one face
thereof proximate to the pulser ring and closing a ring-like space between the
fixed ring and the rotating ring; and
a sensor supported by at least one of the fixed ring and a portion of a vehicle
body is proximate to or brought into contact with another face of the sensor cover
to be opposed to the pulser ring in the axial direction via the sensor cover,
wherein an outer peripheral edge of the sensor cover comprises a folded portion
folded to an inner side of a bearing and a fitting portion formed at least at a
portion of the folded portion,
wherein a fitted portion for fitting the fitting portion is formed at a predetermined
position of an inner peripheral surface of the fixed ring, and
wherein said sensor cover is fixed to said fixed ring with a predetermined clearance
relative to a direction of axis of the pulser ring.
17. A rolling bearing apparatus comprising:
a rotating ring comprising a flange for supporting a wheel;
a fixed ring which is supported on an outer diameter side of the rotating ring
concentrically with the rotating ring and is not rotated;
a plurality of rolling members rollably provided between the rotating ring and
the fixed ring;
a pulser ring which is installed at an outer peripheral surface on one end side
in an axial direction of the rotating ring and a magnetic property of which is
changed alternately in a circumferential direction;
a sensor cover made of a nonmagnetic material installed to an inner peripheral
surface on one end side in an axial direction of the fixed ring by making one face
thereof proximate to the pulser ring and closing a ring-like space between the
fixed ring and the rotating ring; and
a sensor supported by at least one of the fixed ring and a portion of a vehicle
body is proximate to or brought into contact with another face of the sensor cover
to be opposed to the pulser ring in the axial direction via the sensor cover,
wherein a plurality of fitting portions are formed on an outer peripheral edge
of the sensor cover along an outer peripheral,
wherein a plurality of fitted portions for fitting the fitting portion are formed
on an inner peripheral surface of the fixed ring, and
wherein said sensor cover is fixed to said fixed ring with a predetermined clearance
relative to a direction of an axis of the pulser ring.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rolling bearing apparatus for rotatably supporting
a wheel at a suspension of an automobile and having a rotation detecting apparatus
for detecting a rotational speed and a rotational direction of the wheel, particularly
relates to a rolling bearing apparatus having a pulser ring in the rotation detecting apparatus.
2. Description of the Related Art
There is a case in which a rolling bearing apparatus for supporting a wheel
is installed with a rotation detecting apparatus used for controlling an antilock
brake system (ABS) or the like in, for example, an automobile or the like. A rotation
detecting apparatus is constituted to include a pulser ring and a sensor. The pulser
ring is attached to a rotating ring of the rolling bearing apparatus and the sensor
is attached to a fixed ring of the rolling bearing apparatus in a state of being
opposed to the pulser ring. A state of rotating the pulser ring rotated in synchronism
with the rotating ring is detected by the sensor to thereby detect a state of rotating
a wheel. Generally, with regard to the above-described pulser ring, a magnetic
property thereof is changed alternately in a circumferential direction and there
are a magnetic piece type which is constituted by a metal ring in, for example,
a combteeth shape as well as a metal ring provided with through holes at several
portions of the circumference and a magnet type in which a support ring made of
a metal is attached with a ring-like magnet constituted by arranging magnetic poles
alternately in a circumferential direction.
The pulser ring is provided on a side of the rotating ring at one end portion
in an axial direction of a ring-like space between the rotating ring and the fixed
ring in a diameter direction interposed with a rolling is member of a ball or the
like. In order to protect a portion of installing the pulser ring in the ring-like
space such that dust and dirt or mud water or the like is prevented from invading
the portion from outside, a sensor cover for partitioning the ring-like space from
outside is provided. In the case of the prior art, the sensor cover is fitted to
a side of the fixed ring opposed to the rotating ring provided with the pulser
ring and the pulser ring is installed to seal by a seal member between the sensor
cover and a metal ring or the like for fixing the pulser ring to the rotating ring
(refer to, for example, Patent Reference 1).
[Patent Literature 1]: JP-A-2000-211311 (total pages, total drawings)
However, in the case of the above-described prior art, fitting of the sensor
cover to the rotating ring is constituted by a structure of only fitting a cylindrical
portion of the sensor cover to the rotating ring by press-fitting and therefore,
it is not clear to what degree the sensor cover is fitted thereto in an axial direction.
Therefore, there is a concern that the sensor cover is improperly pushed into an
inner side thereof in the axial direction and particularly when the sensor cover
and the pulser ring are arranged to be opposed to each other in the axial direction,
there is a concern that the sensor cover is brought into contact with the pulser
ring to damage the pulser ring. Further, even when the sensor cover is fitted thereto
such that the sensor cover is not brought into contact with the pulser ring, in
the case in which the rolling bearing apparatus are laminated to pile up for storage
or transportation, there is a concern that the sensor cover is pushed thereinto
by a bolt or the like and there is a concern that the pulser ring is damaged by
the sensor cover which is pushed thereinto. Further, when a position of fitting
the sensor cover is insufficient, an interval (clearance, air gap) in the axial
direction between the pulser ring and the sensor is prolonged by being restricted
by the position of the sensor cover and therefore, there is a concern that magnetic
information of the pulser ring cannot accurately be detected by the sensor.
Particularly, when the clearance is intended to be as small as possible,
the sensor cover and the pulser become further proximate to each other, or thin-walled
formation of the sensor cover is achieved and therefore, the above-described problem
in laminating to pile up the rolling bearing apparatus is liable to be posed.
SUMMARY OF THE INVENTION
The invention has been carried out in view of the above-described actual situation
and it is a problem thereof to be resolved to provide a bearing rolling apparatus
capable of avoiding a pulser ring from being damaged and capable of installing
a sensor cover to the pulser ring or the like with excellent positional accuracy.
A rolling bearing apparatus according to the invention is characterized in a
rolling
bearing apparatus comprising a rotating ring having a flange for supporting a wheel,
a fixed ring which is supported on an outer diameter side of the rotating ring
concentrically with the rotating ring and is not rotated, a plurality of pieces
of rolling members rollably provided between the rotating ring and the fixed ring,
a pulser ring which is installed at an outer peripheral surface on one end side
in an axial direction of the rotating ring and a magnetic property of which is
changed alternately in a circumferential direction, and a sensor cover made of
a nonmagnetic material installed to an inner peripheral surface on one end side
in the axial direction of the fixed ring by making one face thereof proximate to
the pulser ring and closing a ring-like space between the fixed ring and the rotating
ring, wherein a sensor supported by the fixed ring or a portion of a vehicle body
is proximate to or brought into contact with other face of the sensor cover to
be opposed to the pulser ring in the axial direction via the sensor cover, the
rolling bearing apparatus comprising a structure in which whereas an outer peripheral
edge of the sensor cover is folded to bend to an inner side of a bearing and a
fitting portion is formed at least at a portion of the folded portion, a fitted
portion for fitting the fitting portion is formed at a predetermined position of
the inner peripheral surface of the fixed ring and a position in the axial direction
of the sensor cover relative to the pulser ring is set to position by fitting the
fitting portion of the sensor cover to the fitted portion of the fixed ring.
According the rolling bearing apparatus of the invention, by setting the
position of the sensor cover in the axial direction relative to the pulser ring
by fitting the fitting portion to the fitted portion of the fixed ring, the sensor
cover can be disposed at a proper constant position which does not hamper detection
or the like of the pulser ring. Further, even when the sensor cover is more or
less exerted with external force as in the case of, for example, laminating to
pile up the rolling bearing apparatus, the position in the axial direction of the
sensor cover is restricted by fitting the fitting portion and the fitted portion
and therefore, the sensor cover is not pushed from the proper position. Therefore,
a drawback of moving the sensor cover to interfere with the pulser ring is avoided.
According to the rolling bearing apparatus of the invention, preferably,
the fitting portion is constituted by a structure of a taper face in a ring-like
shape a diameter of which is gradually reduced in a fitting direction and the fitted
portion is constituted by a structure of a taper face in a ring-like shape a diameter
of which is gradually reduced in the fitting direction. Further, preferably, the
fitting portion is constituted by a projected portion in a ring-like shape and
the fitted portion is constituted by a groove in a ring-like shape fitted with
the projected portion.
In this case, the sensor cover is positioned in the axial direction by fitting
the two taper faces or fitting the projected portion and the ring-like groove and
therefore, working for providing the structure of positioning the sensor cover
in the axial direction is simplified and the sensor cover is preferably prevented
from being drawn.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of a rolling bearing apparatus according to First
Embodiment of the invention;
FIG. 2 is a sectional view enlarging an essential portion of FIG. 1;
FIG. 3 is a sectional view of a rolling bearing apparatus according to Second
Embodiment of the invention;
FIG. 4 is a sectional view enlarging an essential portion of FIG. 3; and
FIG. 5 is a sectional view enlarging an essential portion of a rolling bearing
apparatus according Third Embodiment of the invention.
In the drawings, a reference numeral
15 refers to a pulser ring;
16
to a sensor;
31 to an outer ring;
32 to an inner ring;
33
to a ball;
37 to a sensor cover; and a reference sign K refers to an opening portion.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
<First Embodiment>
FIG. 1 and FIG. 2 show First Embodiment of the invention. Here, there is taken
an example of a rolling bearing apparatus used on a side of a driven wheel of an
automobile. FIG. 1 is a sectional view showing a total of the rolling bearing apparatus
and the like and FIG. 2 is a sectional view enlarging an essential portion in FIG. 1.
A rolling bearing apparatus 1 of First Embodiment includes a hub shaft 2,
a double row rolling bearing 3 and a rotation detecting apparatus 4.
The hub shaft 2 includes a flange 2
a directed to an outer
side in the diameter direction at an outer peripheral surface thereof on a vehicle
outer side. The double row rolling bearing 3 is provided at an outer peripheral
surface of the hub shaft 2 on a vehicle inner side of the flange 2
a
of the hub shaft 2. The double row rolling bearing 3 is constituted
by a double row angular ball bearing directed to an outer side and includes a single
outer ring 31 having two rows of track grooves, a single inner ring 32
having one row of an inner ring track outwardly fitted to a small diameter outer
peripheral surface 2
b of the hub shaft 2, a plurality of balls
33 as rolling members arranged in two rows and two crown type retainers
34, 35 and one inner ring is constituted by a large diameter outer
peripheral surface 2
c of the hub shaft 2. The inner ring 32
and the hub shaft 2 constitute a rotating ring and the outer ring 31
constitutes a fixed ring which is supported on an outer diameter side of the rotating
ring concentrically with the rotating ring and is not rotated. That is, the plurality
of balls 33 are interposed in a state of being aligned in a peripheral direction
in double rows in a state of being disposed in a ring-like space between the large
diameter outer peripheral surface 2
c of the hub shaft 2 and
the outer peripheral surface of inner ring 32 and the inner peripheral surface
of the outer ring 31 and rotatably supported relative to the outer ring
31 as the fixing ring and the hub shaft 2 and the inner ring 32
as the rotating ring.
The outer ring 31 includes a flange 36 directed to an outer side
in the diameter direction at an outer peripheral surface on a vehicle outer side
thereof. A sensor cover 37 for hermetically sealing inside of the bearing
is mounted to the inner peripheral surface on the vehicle inner side of the outer
ring 31.
The double row rolling bearing 3 is unrotatably attached to a vehicle
body by fixing the flange 36 of the outer ring 31 to a carrier (or
knuckle) 5 constituting a portion of the vehicle body by a bolt 6.
A disc rotor 9 of a disc brake apparatus and a wheel 10 are fixed
to an outer side face on a vehicle outer side of the flange 2
a of
the hub shaft 2 by bolts 7 mounted to penetrate at several portions
in the circumference of the flange 2
a.
The rotation detecting apparatus 4 detects a rotational state of a rotational
speed, a rotational direction or the like of the hub shaft 2. The rotation
detecting apparatus 4 includes a pulser ring 15 and a sensor 16.
The pulser ring 15 is arranged to be proximate to one face on an inner side
of the sensor cover 37 and the sensor 16 is arranged to fix to a
vehicle body side by being proximate to other face of an outer side of the sensor
cover 37. In this case, the sensor 16 may be brought into contact
with the sensor cover 37.
The pulser ring 15 is arranged at ends of the outer ring 31 and
the inner ring 32 on one side in the axial direction (vehicle inner side).
Describing in details, a ring-like space K formed to recess to an inner side in
the axial direction is provided at the end portion on the vehicle inner side of
the outer ring 31 and the pulser ring is 15 is fitted to fix to a
shoulder portion of the outer peripheral surface of the inner ring 32 facing
the ring-like space K.
The pulser ring 15 includes a support ring 17 attached to the shoulder
portion of the outer peripheral surface of the inner ring 32 and a ring-like
magnet 18 attached to the support ring 17. The ring-like magnet 18
is constituted by a magnetized rubber ring having a constitution in which, for
example, a rubber material mixed with a magnetic powder of ferrite is constituted
by a shape of a ring-like plate and regions thereof at equal intervals in the circumference
are alternately magnetized into N poles and S poles.
The sensor 16 is attached to the vehicle side in a state in which a central
position thereof for carrying out the detection and a magnetic field generating
portion of the ring-like magnet 18 are made to coincide with each other
in the diameter direction and the sensor cover 37 is disposed therebetween
to be opposed to the ring-like magnet 18 in the axial direction via a predetermined
interval. The sensor 16 outputs an electric signal in correspondence with
the rotational state of the ring-like magnet 18. The sensor 16 is
a so-to-speak active sensor constituted by a magnetic detecting element constituting
a detecting portion an output of which is changed in accordance with a flow of
a magnetic flux of a hole element, a magnetoresistive element or the like and IC
or the like integrated with a waveform shaping circuit for shaping an output waveform
of the magnetic detecting element.
According to the rotation detecting apparatus 4, when the pulser
ring 15 is rotated in accordance with rotation of the inner ring 32
integral with the hub shaft 2, a change in the magnetic flux of the pulser
ring 15 is detected by the sensor 16. A detected rotational output
of the rotation detecting apparatus 4 is utilized for detecting the rotational
speed of the wheel 10 attached to the hub shaft 2.
The structure of the sensor cover 37 will be explained.
The sensor cover 37 is made of a nonmagnetic material of aluminum, copper
or the like and includes a cover main body 38 closing the ring-like space
K. An outer peripheral edge of the cover main body 38 is folded to bend
to an inner side of the bearing. The folded to bend portion 39 includes
a conical portion 39
a as a fitting portion having a ring-like structure
a diameter of which is gradually reduced in a fitting direction and a cylindrical
portion 39
b as a contacting portion having a constant diameter in
the fitting direction from the conical portion 39
a over to a front
end thereof.
The cover main body 38 is constituted by a shape of being projected to
the vehicle inner side to be able to cover the inner ring 32 and a calking
portion 2
d for calking the hub shaft 2 to the inner ring 32.
The folded to bend portion 39 of the cover main body 38 is inwardly
fitted in a state of being press-fitted to an inner peripheral surface 40
of the outer ring 31 facing the opening K at an end portion on one side
thereof in the axial direction.
The inner peripheral surface 40 of the outer ring 31 is constituted
by a conical portion 40
a as a fitted portion constituted by a ring-like
structure a diameter of which is gradually reduced in the fitting direction and
a cylindrical portion 40
b as a contacted portion a diameter of which
is made to be constant in the fitting direction on the inner side of the conical
portion 40
a in the axial direction.
Further, as shown by two-dotted chain lines in FIG. 2, the diameter of the
folded to bend portion 39 of the sensor cover 37 is more or less
made to be larger than the inner diameter of the inner peripheral surface 40
of the outer ring 31 to the outer side in a state before being fitted to
the inner peripheral surface 40 of the outer ring 31. Thereby, in
a state in which the conical portion 39
a of the folded to bend portion
39 of the sensor cover 37 is press-fitted into the conical portion
40
a of the inner peripheral surface 40 of the outer ring 31,
an elastic urge force of the conical portion 39
a is exerted to the
conical portion 40
a of the outer ring 31 such that the conical
portion 39
a is elastically deformed to a state of reducing the diameter
to diverge to an outer side. By exerting the elastic urge force, a contact friction
force of the fitting portion 39
a of the senor cover 37 exerted
to the conical portion 40
a of the outer ring 31 is increased
to operate as a position holding force in the axial direction. Further, by bringing
the two conical portion 39
a, 40
a into contact with
each other, positioning in the axial direction is also carried out, thereby, in
a state in which the conical portion 39
a of the sensor cover 37
is positioned, a position of the sensor cover 37 in the axial direction
relative to the pulser ring 15 is positioned in a predetermined state. Therefore,
the sensor cover 37 can be avoided from being improperly proximate to the
pulser ring 15 and also a gap between the sensor 16 and pulser ring
15 can be brought into a desired state.
Further, according to the constitution of positioning the sensor cover 37
in the axial direction by bringing the two conical portions 39
a,
40
a into contact with each other, in fitting the sensor cover 37
to one end in the axial direction of the outer ring 31, the sensor cover
37 is moved along the axial direction and the conical portion 39
a
is hardly varied to the side of reducing the diameter until faces of the two
conical portion 39
a, 40
a are brought into contact with
each other and therefore, the dimension of the outer diameter of the pulser ring
15 can be set to be large by an amount of reducing the variation to thereby
achieve high accuracy formation of the detection. In this case, the conical portion
39
a of the folded to bend portion 39 of the sensor cover 37
and the conical portion 40
b of the inner peripheral surface 40
of the outer ring 31 are brought into contact with each other.
<Second Embodiment>
Next, an explanation will be given of a rolling bearing apparatus according
to Second Embodiment of the invention in reference to FIG. 3 and FIG. 4. FIG. 3
is a sectional view showing a total of a rolling bearing apparatus and the like
and FIG. 4 is a sectional view enlarging an essential portion in FIG. 3. Further,
a detailed explanation will be omitted of a structure similar to that of First
Embodiment, mentioned above, and the same reference notation will be attached thereto.
In reference to FIG. 3 and FIG. 4, according to Second Embodiment, the folded
to bend portion 39 of the senor cover 37 is constituted by a cylindrical
shape. Substantially at a central portion of a width in the axial direction of
the bent portion 39 in the cylindrical shape, there is formed a projected
portion 43 in a ring-like shape projected to the outer side in the diameter
direction over an entire periphery in the peripheral direction as a fitting portion
achieving a function equivalent to that of the conical portion 39
a of
First Embodiment. Meanwhile, substantially at a middle portion of a width in the
axial direction of the inner peripheral surface 40 of the outer ring 31,
there is formed a recessed groove 44 in a ring-like shape along the peripheral
direction as a fitted portion achieving a function equivalent to that of the conical
portion 40
a of First Embodiment.
Therefore, when the sensor cover 37 is going to be fitted to the
outer ring 31 along the axial direction, the projected portion 43
is engaged with the recess groove 44 and in a state in which the projected
portion 43 is engaged with the recess groove 44, positions of portions
thereof in contact with respective engaged counterparts are restricted in the axial
direction and therefore, the sensor cover 37 is positioned in the axial
direction. Further, in that state, also movement of the position of the sensor
cover 37 for drawing out from the outer ring 31 to the vehicle inner
side is restricted and therefore, the constitution functions to prevent the sensor
cover 37 from being drawn.
Further, positions of portions of forming the projected portion 43
and the recess groove 44 are determined such that the face portion of the
sensor cover 37 opposed to the pulser ring 15 is positioned in the
axial direction with a predetermined constant interval therebetween in view of
a relationship with a position of installing the pulser ring 15. Thereby,
in the state in which the projected portion 43 of the sensor cover 37
is fitted to the recess groove 44, the sensor cover 37 is prevented
from interfering with or being brought into contact with the pulser ring 15
and proper clearance is maintained between the pulser ring 15 and the sensor 16.
Although according to Second Embodiment, mentioned above, the projected
portion 43 is constituted over an entire periphery, a portion thereof may
be interrupted in the peripheral direction. Further, pluralities of the projected
portions 43 and the recess grooves 44 may be provided in the axial
direction. Further, there may be constituted a positioning structure having a constitution
of combining the positioning portion by the taper of First Embodiment, mentioned
above, and the positioning portion by the projected portion and the recess groove
of Second Embodiment
<Third Embodiment>
Explaining a rolling bearing apparatus according to Third Embodiment of
the invention in reference to FIG. 5, according to Third Embodiment, the inner
peripheral surface 40 of the outer ring 31 includes a small diameter
portion 46 as a contacted portion and a large diameter portion 47
as a fitted portion, whereas an interval between the small diameter portion 46
and the large diameter portion 47 is made to constitute a stepped difference
portion D of a face along the diameter direction, in accordance with the stepped
difference structure, also the folded to bend portion 39 for fitting the
sensor cover 37 to the outer ring 31 is formed with a small diameter
fitting portion 48 as a contacting portion and a large diameter cylinder
portion 49 as a fitting portion. In the case of Third Embodiment, when the
folded to bend portion 39 is going to press-fit to the outer ring 31,
the position to the inner side in the axial direction is restricted by a portion
of the stepped difference portion D, thereby, the sensor cover 37 is positioned
in the axial direction.
According to the invention, a rolling bearing apparatus provided with a
sensor cover with excellent positional accuracy to a pulser ring or the like can
be provided.
*
