WO2021059955A1

WO2021059955A1 - Bearing device

Info

Publication number: WO2021059955A1
Application number: PCT/JP2020/033899
Authority: WO
Inventors: 直太山本; 三木　慎一郎; 寺田　淳一
Original assignee: Ntn株式会社
Priority date: 2019-09-26
Filing date: 2020-09-08
Publication date: 2021-04-01
Also published as: JP2021050815A; JP7360875B2

Abstract

A bearing device (100) is provided with a conical roller bearing (10) and a sensor (20). The conical roller bearing (10) has an inner ring (11), an outer ring (12) arranged on the outside of the inner ring (11), conical rollers (13) arranged between the inner ring (11) and the outer ring (12), and a retainer (14) that is arranged between the inner ring (11) and the outer ring (12) and holds the conical rollers (13). The sensor (20) has a sensor head (21) for detecting rotation of the retainer. The inner ring (11) includes a first inner circumferential surface (11c) and a first outer circumferential surface (11d). The outer ring (12) includes: a second inner circumferential surface (12c) opposing the first outer circumferential surface (11d); a second outer circumferential surface (12d); and a first width surface (12a) and second width surface (12b), which are end surfaces in the axial direction of the outer ring (12), and are continuous with the second inner circumferential surface (12c) and the second outer circumferential surface (12d).

Description

Bearing equipment

The present invention relates to a bearing device.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2018-96469) describes a rolling bearing with a sensor. The rolling bearing with a sensor described in Patent Document 1 includes a conical roller bearing, a seal member, and a sensor.

The conical roller bearing has an inner ring, an outer ring, a conical roller arranged between the inner ring and the outer ring, and a cage arranged between the inner ring and the outer ring and holding the conical roller. are doing. The sealing member is attached to the conical roller bearing so as to close the bearing space between the inner ring and the outer ring. The sensor is located on the seal member so as to face the end of the cage. The sensor detects the rotation of the inner ring by detecting the rotation of the cage.

JP-A-2018-96469

In the rolling bearing with a sensor described in Patent Document 1, the sensor is arranged on the seal member as described above, and Patent Document 1 particularly relates to arranging the sensor on a member other than the seal member. There is no mention.

The present invention has been made in view of the above-mentioned problems of the prior art. More specifically, the present invention provides a bearing device capable of accurately arranging a sensor on a member other than the seal member.

The bearing device of the present invention includes a conical roller bearing and a sensor. The conical roller bearing is arranged between the inner ring, the outer ring arranged outside the inner ring, the conical roller arranged between the inner ring and the outer ring, and the inner ring and the outer ring, and holds the conical roller. Has a cage and. The sensor has a sensor head that detects the rotation of the cage. The inner ring includes a first inner peripheral surface and a first outer peripheral surface. The outer ring is a second inner peripheral surface facing the first outer peripheral surface, a second outer peripheral surface, and an end surface in the axial direction of the outer ring, and is connected to the second inner peripheral surface and the second outer peripheral surface. It includes a width plane and a second width plane. The second inner peripheral surface is inclined with respect to the central axis so that the distance from the central axis of the outer ring becomes shorter from the first width surface side to the second width surface side. The sensor head is in contact with the first width surface.

In the above bearing device, the sensor head may be located at a position farther from the central axis of the outer ring than the conical roller in the radial direction of the outer ring.

In the above bearing device, the sensor head may have a detection surface facing the cage. The cage may include a third inner peripheral surface facing the first outer peripheral surface and a third outer peripheral surface facing the second inner peripheral surface. The third outer peripheral surface may be formed with a recess recessed toward the third inner peripheral surface side. The detection surface and the bottom surface of the recess may be parallel to each other. The portion of the third outer peripheral surface on which the recess is formed may be inclined with respect to the detection surface.

In the above bearing device, the sensor head may have a detection surface facing the cage. The cage may include a third inner peripheral surface facing the first outer peripheral surface and a third outer peripheral surface facing the second inner peripheral surface. The detection surface and the third outer peripheral surface may be parallel to each other.

In the above bearing device, the sensor head has a flat surface including an abutting surface that positions the sensor head in the axial direction of the outer ring by abutting on the first width surface, and projects from the flat surface along the axial direction of the outer ring. It may have a protruding portion that positions the sensor head in the radial direction of the outer ring by contacting with the second outer peripheral surface.

The above bearing device may further include a housing to which an outer ring is attached. The sensor head may be attached to the housing so that movement along the circumferential direction of the outer ring and the radial direction of the outer ring is restricted.

The above bearing device may further include a housing to which an outer ring is attached. The sensor may further include wiring connected to the sensor head and a tubular member. The wiring may be drawn from the sensor head to the outside of the housing through the inside of the tubular member.

According to the bearing device of the present invention, the sensor can be accurately arranged on a member other than the seal member, more specifically, on the outer ring.

It is sectional drawing of the bearing apparatus 100. It is sectional drawing of the cage 14. It is sectional drawing of the cage 14 which concerns on a modification. It is 1st schematic diagram for demonstrating the processing amount at the time of forming a recess 14ba. It is a 2nd schematic diagram for demonstrating the processing amount at the time of forming a recess 14ba. It is sectional drawing of the bearing device 200. It is sectional drawing of the bearing apparatus 300. It is sectional drawing of the bearing apparatus 300 which concerns on a modification.

The details of the embodiment will be explained with reference to the drawings. In the following drawings, the same or corresponding parts shall be designated by the same reference numerals, and duplicate explanations shall not be repeated.

(First Embodiment)
The bearing device (hereinafter referred to as “bearing device 100”) according to the first embodiment will be described below.

<Structure of bearing device 100>
FIG. 1 is a cross-sectional view of the bearing device 100. As shown in FIG. 1, the bearing device 100 includes a conical roller bearing 10, a sensor 20, a rotating shaft 30, and a housing 40.

<Structure of tapered roller bearing 10>
The conical roller bearing 10 has an inner ring 11, an outer ring 12, a conical roller 13, and a cage 14.

The inner ring 11 has a ring shape. The inner ring 11 has a central axis A1. The inner ring 11 has a first width surface 11a, a second width surface 11b, an inner peripheral surface 11c (first inner peripheral surface), and an outer peripheral surface 11d (first outer peripheral surface).

The first width surface 11a and the second width surface 11b are end faces in the axial direction of the inner ring 11. The first width surface 11a is connected to the inner peripheral surface 11c and the outer peripheral surface 11d. The second width surface 11b is the opposite surface of the first width surface 11a in the axial direction of the inner ring 11. The second width surface 11b is connected to the inner peripheral surface 11c and the outer peripheral surface 11d.

The inner peripheral surface 11c extends along the circumferential direction of the inner ring 11. The inner ring 11 is attached to the rotating shaft 30 on the inner peripheral surface 11c. The inner peripheral surface 11c faces the central axis A1 side.

The outer peripheral surface 11d extends along the circumferential direction of the inner ring 11. The outer peripheral surface 11d faces the side opposite to the central axis A1. That is, the outer peripheral surface 11d is the opposite surface of the inner peripheral surface 11c in the radial direction of the inner ring 11. The outer peripheral surface 11d includes an inner ring raceway surface 11da. The inner ring raceway surface 11da is in contact with the conical roller 13. The inner ring raceway surface 11da is inclined with respect to the central axis A1 so that the distance from the central axis A1 becomes shorter from the first width surface 11a side to the second width surface 11b side.

The outer ring 12 has a ring shape. The outer ring 12 has a central axis A2. The central axis A2 coincides with the central axis A1. The outer ring 12 has a first width surface 12a, a second width surface 12b, an inner peripheral surface 12c (second inner peripheral surface), and an outer peripheral surface 12d (second outer peripheral surface).

The first width surface 12a and the second width surface 12b are end faces of the outer ring 12 in the axial direction. The first width surface 12a is connected to the inner peripheral surface 12c and the outer peripheral surface 12d. The second width surface 12b is the opposite surface of the first width surface 12a in the axial direction of the outer ring 12. The second width surface 12b is connected to the inner peripheral surface 12c and the outer peripheral surface 12d.

The inner peripheral surface 12c extends along the circumferential direction of the outer ring 12. The inner peripheral surface 12c faces the central axis A2 side. The inner peripheral surface 12c includes the outer ring raceway surface 12ca. The outer ring raceway surface 12ca is in contact with the conical roller 13. The inner peripheral surface 12c (outer ring raceway surface 12ca) is inclined with respect to the central axis A2 so that the distance from the central axis A2 becomes shorter from the first width surface 12a side to the second width surface 12b side.

The outer peripheral surface 12d extends along the circumferential direction of the outer ring 12. The outer peripheral surface 12d faces the side opposite to the central axis A2. That is, the outer peripheral surface 12d is the opposite surface of the inner peripheral surface 12c in the radial direction of the outer ring 12. The outer ring 12 is attached to the housing 40 on the outer peripheral surface 12d.

The conical roller 13 has a first end surface 13a (large diameter end surface), a second end surface 13b (small diameter end surface), and an outer peripheral surface 13c (rolling surface). The conical roller 13 has a truncated cone shape in which the outer diameter decreases from the first end surface 13a side to the second end surface 13b side. The inner ring raceway surface of the conical roller 13 has the first end surface 13a facing the first width surface 11a (first width surface 12a) side and the second end surface 13b facing the second width surface 11b (second width surface 12b) side. It is arranged between 11da and the outer ring raceway surface 12ca. The number of cone rollers 13 is plural.

In the conical roller 13, the ridge line between the first end surface 13a and the outer peripheral surface 13c and the ridge line between the second end surface 13b and the outer peripheral surface 13c may be chamfered. The inclined surface formed on the ridge line between the first end surface 13a and the outer peripheral surface 13c by this chamfer is referred to as an inclined surface 13d, and the inclined surface formed on the ridge line between the second end surface 13b and the outer peripheral surface 13c by this chamfer is defined as 13e. ..

The inner ring 11, outer ring 12, and conical roller 13 are formed of, for example, bearing steel. The inner ring 11, outer ring 12, and conical roller 13 are formed of, for example, high carbon chrome bearing steels SUJ2, SUJ3, etc. defined in JIS standards. However, the inner ring 11, the outer ring 12, and the conical roller 13 may be formed of other materials.

The cage 14 has a ring shape. The cage 14 is arranged between the inner ring 11 and the outer ring 12 (between the outer peripheral surface 11d and the inner peripheral surface 12c). The cage 14 has an inner peripheral surface 14a (third inner peripheral surface) and an outer peripheral surface 14b (third outer peripheral surface). The inner peripheral surface 14a and the outer peripheral surface 14b extend along the circumferential direction of the cage 14. The outer peripheral surface 14b is the opposite surface of the inner peripheral surface 14a in the circumferential direction of the cage 14. The inner peripheral surface 14a faces the outer peripheral surface 11d, and the outer peripheral surface 14b faces the inner peripheral surface 12c.

The cage 14 holds the conical rollers 13 so that the distance between the two adjacent conical rollers 13 in the circumferential direction of the cage 14 is within a certain range. More specifically, in the cage 14, pockets 14c penetrating the cage 14 in the direction from the inner peripheral surface 14a to the outer peripheral surface 14b are formed at equal intervals along the circumferential direction of the cage 14. The cone roller 13 is arranged in the pocket 14c. The cage 14 is made of, for example, a ferromagnetic material.

FIG. 2 is a cross-sectional view of the cage 14. As shown in FIG. 2, a plurality of recesses 14ba are formed on the outer peripheral surface 14b. The outer peripheral surface 14b is recessed on the inner peripheral surface 14a side in the recess 14ba. The recesses 14ba are formed at equal intervals along the circumferential direction of the cage 14. From another point of view, at least a part of the cage 14 is a pulsar ring. In FIG. 1, the recess 14ba is indicated by a dotted line. As shown in FIG. 1, the portion of the outer peripheral surface 14b on which the recess 14ba is formed is inclined with respect to the detection surface 21a of the sensor head 21, which will be described later.

FIG. 3 is a cross-sectional view of the cage 14 according to the modified example. As shown in FIG. 3, the recess 14ba may penetrate the cage 14 along the direction from the outer peripheral surface 14b to the inner peripheral surface 14a.

<Structure of sensor 20>
As shown in FIG. 1, the sensor 20 includes a sensor head 21, a wiring 22, and a tubular member 23.

The sensor head 21 has a detection surface 21a. The sensor head 21 is arranged so that the detection surface 21a faces the outer peripheral surface 14b. The detection surface 21a is orthogonal to, for example, the radial direction of the outer ring 12. The detection surface 21a is closest to the cage 14 side of the sensor head 21.

As described above, since the concave portion 14ba is formed on the outer peripheral surface 14b, the magnetic field between the detection surface 21a and the outer peripheral surface 14b fluctuates as the cage 14 rotates. The sensor head 21 detects the rotation of the cage 14 by detecting the fluctuation of the magnetic field. That is, the sensor head 21 is, for example, a rotating magnetic sensor. Since the rotation speed of the cage 14 and the rotation speed of the inner ring 11 (rotational speed of the rotation shaft 30) are in a proportional relationship, the inner ring 11 is multiplied by a predetermined coefficient by the detected rotation speed of the cage 14. The rotation speed of (rotational shaft 30) can be calculated. The detection surface 21a is preferably parallel to the bottom surface of the recess 14ba.

The sensor head 21 is in contact with the first width surface 12a. Further, the sensor head 21 is in contact with the outer peripheral surface 12d. As a result, the sensor head 21 is positioned with respect to the outer ring 12 in the radial direction and the axial direction of the outer ring 12. However, the sensor head 21 is not fixed to the outer ring 12.

More specifically, the sensor head 21 has a flat surface 21b. The flat surface 21b is a surface facing the first width surface 12a side. The flat surface 21b includes a contact surface 21c. The contact surface 21c is in contact with the first width surface 12a. The contact surface 21c is closest to the detection surface 21a among the flat surfaces 21b. The sensor head 21 further has a protrusion 21d. The protruding portion 21d protrudes from the flat surface 21b along the axial direction of the outer ring 12. The protruding portion 21d is in contact with the outer peripheral surface 12d. The contact surface 21c abuts on the first width surface 12a and the protruding portion 21d abuts on the outer peripheral surface 12d, so that the sensor head 21 is positioned with respect to the outer ring 12 in the radial and axial directions of the outer ring 12. There is.

The sensor head 21 is preferably located at a position farther from the central axis A2 than the conical roller 13. That is, the portion of the sensor head 21 closest to the central axis A2 (detection surface 21a) is located farther from the central axis A2 than the portion of the conical roller 13 farthest from the central axis A2 (inclined surface 13d). is there. However, the distance between the detection surface 21a and the outer peripheral surface 14b is set to be less than the maximum distance that can be sensed by the sensor head 21.

The wiring 22 is connected to the sensor head 21 at one end. The wiring 22 is, for example, a power supply wiring for supplying electric power to the sensor head 21, a signal wiring for outputting an output signal from the sensor head 21, and the like. Although not shown, the wiring 22 is connected to the outside of the bearing device 100 (outside the housing 40) at the other end.

The tubular member 23 has a tubular shape with a hollow inside. The tubular member 23 has, for example, a cylindrical shape. The tubular member 23 extends along the radial direction of the outer ring 12 on the side opposite to the central axis A2. The tubular member 23 is connected to the sensor head 21 at one end. The other end of the tubular member 23 is outside the housing 40, although not shown. The wiring 22 is drawn out of the housing 40 through the inside of the tubular member 23.

The tubular member 23 is fixed to the housing 40. As a result, the sensor head 21 is attached to the housing 40 so that the movement of the outer ring 12 along the radial direction and the axial direction is restricted.

<Structure of rotating shaft 30>
The rotating shaft 30 has a central axis A3. The central axis A3 coincides with the central axis A1 and the central axis A2. The rotating shaft 30 has an outer peripheral surface 30a. The rotating shaft 30 is inserted into the inner ring 11 so that the outer peripheral surface 30a is in contact with the inner peripheral surface 11c. As a result, the rotating shaft 30 is rotatably supported around the central axis A3 by the conical roller bearing 10.

<Effect of bearing device 100>
Since the sensor head 21 is in contact with the first width surface 12a, the sensor head 21 can be accurately positioned with respect to the outer ring 12. As described above, according to the bearing device 100, the sensor 20 can be arranged on a member other than the seal member, more specifically, on the outer ring 12.

In assembling the bearing device 100, first, the outer ring 12 and the sensor 20 are attached to the housing 40. Secondly, the inner ring 11 is attached to the rotating shaft 30, and the cage 14 holding the conical roller 13 is attached to the inner ring 11 (the cage 14 holding the conical roller 13 is attached). The inner ring 11 is called an inner ring assembly). Third, the conical roller bearing 10 is assembled by inserting the inner ring assembly into the outer ring 12.

In the bearing device 100, when the sensor head 21 is located farther from the central axis A2 than the conical roller 13, the sensor head 21 and the conical roller 13 do not interfere with each other when the inner ring assembly is assembled to the outer ring 12. Assembling of the conical roller bearing 10 can be facilitated.

FIG. 4A is a first schematic diagram for explaining the processing amount when forming the concave portion 14ba. FIG. 4B is a second schematic view for explaining the processing amount when forming the concave portion 14ba. In FIGS. 4A and 4B, the detection range of the sensor head 21 is indicated by a dotted line. Since the recess 14ba is formed by removing the portion of the cage 14 that overlaps the detection range of the sensor head 21, the portion of the outer peripheral surface 14b on which the recess 14ba is formed is detected as shown in FIG. 4A. When the recess 14ba is parallel to the surface 21a, if the recess 14ba is formed so that the bottom surface of the recess 14ba is parallel to the detection surface 21a, the amount of processing for forming the recess 14ba increases. On the other hand, in the bearing device 100, the portion of the outer peripheral surface 14b on which the recess 14ba is formed is inclined with respect to the detection surface 21a, and the bottom surface of the recess 14ba is parallel to the detection surface 21a. As shown in 4B, the amount of processing when forming the recess 14ba is reduced. As described above, in the bearing device 100, the amount of processing required to be performed on the cage 14 when forming the recess 14ba can be reduced, so that the step of forming the cage 14 can be simplified.

In the bearing device 100, the sensor head 21 is in contact with the first width surface 12a and the outer peripheral surface 12d (the contact surface 21c is in contact with the first width surface 12a and the protruding portion 21d is in contact with the outer peripheral surface 12d). In this case, since the sensor head 21 can be positioned on the outer ring 12 from two directions, the radial direction and the axial direction of the outer ring 12, the positioning accuracy of the sensor head 21 can be further improved.

During the operation of the bearing device 100, the outer ring 12 may rotate (creep) with respect to the housing 40. If the sensor head 21 is fixed to the outer ring 12, the sensor head 21 will rotate together with the outer ring 12 due to creep. If the sensor head 21 rotates together with the outer ring 12, the wiring 22 may be disconnected. In the bearing device 100, when the sensor head 21 is not fixed to the outer ring 12 and is attached to the housing 40 so that the movement of the outer ring 12 along the radial direction and the axial direction is restricted, the outer ring 12 creeps. Even so, since the sensor head 21 does not rotate together with the outer ring 12, it is possible to prevent the wiring 22 from being disconnected.

In the bearing device 100, when the sensor 20 has a tubular member 23 and the wiring 22 is pulled out of the housing 40 through the inside of the tubular member 23, the wiring 22 is exposed inside the housing 40. Therefore, the wiring 22 can be protected from oil and the like.

(Second Embodiment)
The bearing device (hereinafter referred to as “bearing device 200”) according to the second embodiment will be described below. Here, the differences from the bearing device 100 will be described, and the overlapping description will not be repeated.

FIG. 5 is a cross-sectional view of the bearing device 200. As shown in FIG. 5, the bearing device 200 includes a conical roller bearing 10, a sensor 20, a rotating shaft 30, and a housing 40. The conical roller bearing 10 has an inner ring 11, an outer ring 12, a conical roller 13, and a cage 14. The sensor 20 has a sensor head 21, a wiring 22, and a tubular member 23. Regarding these points, the configuration of the bearing device 200 is common to the configuration of the bearing device 100.

However, the configuration of the bearing device 200 is different from the configuration of the bearing device 100 in terms of the positional relationship between the sensor head 21 and the cage 14. More specifically, in the bearing device 200, the sensor head 21 is arranged so that the detection surface 21a is parallel to the outer peripheral surface 14b. In the bearing device 200, the detection surface 21a is inclined with respect to the radial direction of the outer ring 12. As a result, the bearing device 200 can secure a wide sensing range by the sensor head 21.

(Third Embodiment)
The bearing device (hereinafter referred to as “bearing device 200”) according to the third embodiment will be described below. Here, the differences from the bearing device 200 will be described, and the overlapping description will not be repeated.

FIG. 6 is a cross-sectional view of the bearing device 300. As shown in FIG. 6, the bearing device 300 includes a conical roller bearing 10, a sensor 20, a rotating shaft 30, and a housing 40. The conical roller bearing 10 has an inner ring 11, an outer ring 12, a conical roller 13, and a cage 14. The sensor 20 has a sensor head 21 and a wiring 22. Regarding these points, the configuration of the bearing device 300 is common to the configuration of the bearing device 200.

However, the configuration of the bearing device 300 is different from that of the bearing device 200 in terms of the details of the configuration of the sensor 20. More specifically, the sensor 20 does not have a tubular member 23. The bearing device 300 further includes a fixing member 50. The fixing member 50 is, for example, a bolt.

The sensor head 21 is fixed to the housing 40 by the fixing member 50 so that the movement of the outer ring 12 along the radial direction and the axial direction is restricted. As a result, even if the outer ring 12 creeps, the sensor head 21 does not rotate together with the outer ring 12, so that the wiring 22 can be prevented from being disconnected.

<Modification example of bearing device 300>
FIG. 7 is a cross-sectional view of the bearing device 300 according to the modified example. As shown in FIG. 7, the bearing device 300 has an axial retaining member 60. The axial retaining member 60 has a base portion 61, a protruding portion 62, and a protruding portion 63.

The base portion 61 has a first end 61a and a second end 61b in the longitudinal direction thereof. The axial retaining member 60 is inserted between the outer ring 12 and the housing 40 so that the first end 61a protrudes from the second width surface 12b and the second end 61b protrudes from the first width surface 12a. .. The base 61 is in contact with the outer ring 12 (outer peripheral surface 12d). The protrusion 62 and the protrusion 63 project from the base 61 so as to abut the housing 40. In the axial retaining member 60, the base portion 61 abuts on the outer ring 12, and the projecting portion 62 and the projecting portion 63 abut on the housing 40, so that the movement of the outer ring 12 in the radial direction and the axial direction is restricted.

The sensor head 21 is attached to the second end 61b by a retaining ring or the like. As described above, since the movement of the axial retaining member 60 in the radial direction and the axial direction of the outer ring 12 is restricted, the sensor head 21 attached to the axial retaining member 60 also has the radial direction and the shaft of the outer ring 12. The movement of the axial retaining member 60 in the direction is restricted. As a result, even if the outer ring 12 creeps, the sensor head 21 does not rotate together with the outer ring 12, so that the wiring 22 can be prevented from being disconnected.

Although the embodiment of the present invention has been described above, it is possible to modify the above-described embodiment in various ways. Moreover, the scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

The above embodiment is particularly advantageously applied to a bearing device having a sensor.

10 Conical roller bearings, 11 inner ring, 11a first width surface, 11b second width surface, 11c inner peripheral surface, 11d outer peripheral surface, 11da inner ring raceway surface, 12 outer ring, 12a first width surface, 12b second width surface, 12c inner peripheral surface, 12ca outer ring raceway surface, 12d outer peripheral surface, 13a first end surface, 13b second end surface, 13c outer peripheral surface, 13d inclined surface, 14 cage, 14a inner peripheral surface, 14b outer peripheral surface, 14ba recess, 14c pocket, 20 sensor, 21 Sensor head, 21a detection surface, 21b flat surface, 21c contact surface, 21d protrusion, 22 wiring, 23 tubular member, 30 rotating shaft, 30a outer peripheral surface, 40 housing, 50 fixing member, 60 axial retaining member, 61 base, 61a 1st end, 61b 2nd end, 62,63 protruding part, 100,200,300 bearing device, A1, A2, A3 central axis.

Claims

An inner ring, an outer ring arranged outside the inner ring, a conical roller arranged between the inner ring and the outer ring, and a conical roller arranged between the inner ring and the outer ring to hold the conical roller. Conical roller bearings with cages and
A sensor having a sensor head for detecting the rotation of the cage is provided.
The inner ring includes a first inner peripheral surface and a first outer peripheral surface.
The outer ring is a second inner peripheral surface facing the first outer peripheral surface, a second outer peripheral surface, and end faces in the axial direction of the outer ring, and is formed on the second inner peripheral surface and the second outer peripheral surface. Including the first width surface and the second width surface that are continuous,
The second inner peripheral surface is inclined with respect to the central axis so that the distance from the central axis of the outer ring becomes shorter from the first width surface side toward the second width surface side.
A bearing device in which the sensor head is in contact with the first width surface.
The bearing device according to claim 1, wherein the sensor head is located at a position farther from the central axis of the outer ring than the conical roller in the radial direction of the outer ring.
The sensor head has a detection surface facing the cage and has a detection surface.
The cage includes a third inner peripheral surface facing the first outer peripheral surface and a third outer peripheral surface facing the second inner peripheral surface.
The third outer peripheral surface is formed with a recess that is recessed toward the third inner peripheral surface side.
The detection surface and the bottom surface of the recess are parallel to each other.
The bearing device according to claim 1 or 2, wherein the portion of the third outer peripheral surface on which the recess is formed is inclined with respect to the detection surface.
The sensor head has a detection surface facing the cage and has a detection surface.
The cage includes a third inner peripheral surface facing the first outer peripheral surface and a third outer peripheral surface facing the second inner peripheral surface.
The bearing device according to claim 1 or 2, wherein the detection surface and the third outer peripheral surface are parallel to each other.
The sensor head has a flat surface including an abutting surface that positions the sensor head in the axial direction of the outer ring by abutting on the first width surface, and projects from the flat surface along the axial direction of the outer ring. The bearing device according to any one of claims 1 to 4, further comprising a protruding portion that positions the sensor head in the radial direction of the outer ring by abutting on the second outer peripheral surface.
Further provided with a housing to which the outer ring is attached
The bearing according to any one of claims 1 to 5, wherein the sensor head is attached to the housing so as to restrict movement along the circumferential direction of the outer ring and the radial direction of the outer ring. apparatus.
Further provided with a housing to which the outer ring is attached
The sensor further includes wiring connected to the sensor head and a tubular member.
The bearing device according to any one of claims 1 to 5, wherein the wiring is drawn out from the sensor head to the outside of the housing through the inside of the tubular member.