JP6627277B2 - Rolling bearing - Google Patents

Description

  The present invention relates to a rolling bearing.

  Many rolling bearings are used in various industrial devices. The rolling bearing includes an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring. As shown in FIG. 5, in a rolling bearing 90 that supports a rotating shaft 95 in a housing 97, an inner ring 91 is attached to the rotating shaft 95 by external fitting, and an outer ring 92 is attached to the housing inner peripheral surface 98. I have. In a preload-applying type rolling bearing for a motor or the like, a gap is fitted between the outer ring 92 and the inner peripheral surface 98 of the housing.

  Therefore, in order to prevent circumferential displacement (hereinafter also referred to as creep) of the rolling bearing 90 (outer ring 92) with respect to the housing inner peripheral surface 98, a technique of fixing the outer ring 92 to the housing inner peripheral surface 98 with an adhesive is known. It is known (for example, see Patent Document 1).

  In the case of the prior art shown in FIG. 5, in a state where the rolling bearing 90 is attached to the housing inner peripheral surface 98, the adhesive is fitted to the outer ring 92 and the housing inner peripheral surface 98 through a hole 96 provided in the housing 97. The outer ring 92 is fixed to the housing 97 with the adhesive.

JP 2010-216580 A

  However, when the outer ring 92 is fixed to the housing 97 with an adhesive, creep is prevented, but the rotational vibration of the shaft / bearing system is easily transmitted to the housing 97, and the housing 97 vibrates to generate noise. There is. That is, in order to prevent creep, vibration (noise) of the housing 97 becomes a problem.

  Therefore, an object of the present invention is to suppress the displacement (creep) of the rolling bearing in the circumferential direction with respect to the inner peripheral surface of the housing and to make it difficult to transmit the vibration due to the bearing rotation to the housing.

  A rolling bearing according to the present invention for achieving the above object has an inner ring attached to a shaft and attached thereto, an outer ring attached to an inner peripheral surface of a housing, and a plurality of rollers interposed between the inner ring and the outer ring. A rolling element, and a cylindrical elastic member provided along the circumferential direction on a part of the outer peripheral surface of the outer ring and having an axial dimension larger than a radial thickness dimension, and the elastic member and the outer ring The other part of the outer peripheral surface constitutes a bearing outer peripheral surface fitted to the inner peripheral surface of the housing.

  According to the present invention, the displacement (creep) of the rolling bearing (outer ring) in the circumferential direction with respect to the inner peripheral surface of the housing can be suppressed by the frictional resistance of the elastic member, and the elastic member functions as a damper. In addition, it is possible to make it difficult to transmit vibration due to bearing rotation to the housing. Further, when a load is applied to the rolling bearing, the load can be transmitted to the housing at the other portion of the outer peripheral surface of the outer ring where the elastic member is not provided, and the rigidity of the bearing is maintained.

Further, the outer peripheral surface of the outer ring is a first outer peripheral surface portion where the part is provided with the elastic member, and a second outer peripheral surface portion which is the other portion and has a diameter larger than the first outer peripheral surface portion. Is preferable.
In this case, the outer peripheral surface of the outer race has a stepped shape having a first outer peripheral surface portion having a smaller diameter and a second outer peripheral surface portion having a larger diameter, and an elastic member is provided on the first outer peripheral surface portion. It is possible to contact the peripheral surface. Accordingly, the elastic member has a thickness dimension, and it is easy to secure a predetermined allowance in the radial direction, and the function of suppressing the creep can be enhanced. Further, the outer ring can be fitted to the inner peripheral surface of the housing at the second outer peripheral surface portion which is the other portion of the outer peripheral surface, and a configuration for maintaining the rigidity of the bearing is obtained.

Further, it is preferable that at least one of the both edges in the axial direction of the elastic member is provided with a reduced-diameter surface whose diameter decreases toward the axial end.
When the outer ring is moved in the axial direction with respect to the inner peripheral surface of the housing and attached, the reduced diameter surface is provided on the outer peripheral side of the edge of the elastic member which is on the front side in the moving direction. Functions as a guide surface, which facilitates attachment of the outer ring. Further, the space on the radially outer side of the reduced diameter surface can function as a space for releasing a part of the elastic member which is pushed by the inner circumferential surface of the housing and elastically deforms.

  The rolling element is a ball, and the elastic member is provided on a virtual extension line passing through a contact point between the raceway surface of the inner ring and the ball and a contact point between the ball and the raceway surface of the outer ring. May be provided. In this case, it is possible to enhance the function of making it difficult to transmit vibration due to bearing rotation to the housing.

  Or, the rolling element is a ball, a contact point between the raceway surface of the inner ring and the ball, and a virtual extension line passing through a contact point between the ball and the raceway surface of the outer ring, The other portion of the outer peripheral surface may be provided. In this case, when a load is applied to the rolling bearing, the load can be transmitted to the housing at the other portion of the outer peripheral surface of the exposed outer race, and the rigidity of the bearing can be further increased.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to suppress the displacement (creep) of the rolling bearing with respect to the housing inner peripheral surface in the circumferential direction, it is possible to make it difficult to transmit vibrations due to bearing rotation to the housing.

It is a longitudinal section showing one embodiment of a rotation device containing a rolling bearing of the present invention. It is sectional drawing of the rolling bearing shown on the right side of FIG. FIG. 4 is a cross-sectional view of a part of an outer ring and an elastic member fixed to the outer ring. FIG. 4 is a cross-sectional view illustrating a modified example of the rolling bearing illustrated in FIG. 2. It is a longitudinal section showing the conventional rotation device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing one embodiment of a rotating device 1 including a rolling bearing 7 of the present invention. The rotating device 1 has a housing 2 and a rotating shaft 4, and the rotating shaft 4 is rotatably supported by the housing 2 by a pair of rolling bearings 7, 7. The housing 2 and the rotating shaft 4 are both made of steel, and may be, for example, ordinary steel or carbon steel. The rotating shaft 4 is interposed between the small diameter shaft portions 4a, 4a to which the rolling bearings 7, 7 are attached, and the rolling bearings 7, 7 (the inner rings 11, 11), and has a larger outer diameter than the small diameter shaft portion 4a. And a radial shaft portion 4b.

  Annular portions 5a and 5b are provided on both sides in the axial direction of the inner peripheral surface 3 of the housing 2 (hereinafter, also referred to as the housing inner peripheral surface 3). The rolling bearing 7 shown in FIG. 1 is a preload applying type bearing for a motor, and a preload spring 6 is provided between an annular portion 5b and an outer ring 12 of the rolling bearing 7 on one axial side (right side in FIG. 1). Is provided. By the preload spring 6, the rolling bearings 7, 7 are in a state where an axial preload is applied.

  The rolling bearing 7 on one side in the axial direction (the right side in FIG. 1) and the rolling bearing 7 on the other side in the axial direction (the left side in FIG. 1) have the same configuration, but the mounting directions are opposite. In the following, a detailed configuration will be described with the rolling bearing 7 on one side in the axial direction (the right side in FIG. 1) as a representative.

  FIG. 2 is a sectional view of the rolling bearing 7. The rolling bearing 7 includes an inner ring 11 fitted to and attached to the rotating shaft 4, an outer ring 12 fitted to and fitted to the housing inner peripheral surface 3, and an interposition between the inner ring 11 and the outer ring 12. And a plurality of rolling elements. The rolling element of the present embodiment is a ball 13, and the rolling bearing 7 shown in FIG. 2 is a deep groove ball bearing. The rolling bearing 7 includes an annular retainer 14 for holding the plurality of balls 13, and sealing members 16 provided on both axial sides of an annular space 15 formed between the inner ring 11 and the outer ring 12. 17 are provided.

  The inner ring 11 is fitted in close contact with the rotating shaft 4 and can rotate integrally with the rotating shaft 4. The outer ring 12 is attached to the housing 2 in a fixed state, and the outer ring 12 is attached to the inner peripheral surface 3 of the housing with a clearance fit. An inner raceway groove (track surface) 11a on which the ball 13 rolls is provided on the outer peripheral surface of the inner race 11, and an outer raceway groove (track) on which the ball 13 rolls is formed on the inner peripheral surface of the outer race 12. Surface) 12a is provided.

The plurality of balls 13 are provided in an annular space 15 between the inner ring 11 and the outer ring 12, and when the rolling bearing 7 rotates (when the inner ring 11 rotates), the balls 13 are held by the retainer 14. In this state, the inner raceway groove 11a and the outer raceway groove 12a roll.
The inner ring 11, the outer ring 12, and the balls 13 of the present embodiment are made of steel such as bearing steel.

  The retainer 14 can hold the plurality of balls 13 at predetermined intervals (equal intervals) along the circumferential direction. For this reason, the retainer 14 has a pocket 18 for accommodating the balls 13. A plurality is formed along the circumferential direction. The retainer 14 of the present embodiment includes an annular portion 14a provided on one axial side of the ball 13 and a plurality of pillar portions 14b extending from the annular portion 14a to the other axial side. Have. The pocket 18 is located on the other axial side (the left side in FIG. 2) of the annular portion 14a and between the pair of pillar portions 14b, 14b adjacent in the circumferential direction. The retainer 14 of the present embodiment is made of resin, but may be made of metal. Further, the retainer 14 may have another form, for example, a configuration having an annular portion on the other side in the axial direction.

  The sealing members 16 and 17 are formed of shield plates that are not in contact with the inner ring 11. The radially outer portions 16a, 17a of the sealing members 16, 17 are attached to the outer race 12, and the radially inner portions 16b, 17b face the inner race 11 with a gap. The sealing members 16 and 17 may be seals having rubber lips.

  Further, the rolling bearing 7 of the present embodiment further includes an elastic member 20 attached to the outer race 12. The elastic member 20 has a cylindrical shape, and is provided along a circumferential direction on a first outer peripheral surface portion 31 which is a part of the outer peripheral surface 30 of the outer race 12. That is, the cylindrical elastic member 20 is provided so as to cover the first outer peripheral surface 31 along the circumferential direction. The elastic member 20 is made of rubber (for example, nitrile rubber), is vulcanized and bonded to the first outer peripheral surface 31, and is integral with the outer ring 12.

  FIG. 3 is a cross-sectional view of a part of the outer ring 12 and the elastic member 20 fixed to the outer ring 12. 3 (and FIG. 2) shows the elastic member 20 in a natural state before elastic deformation, and the housing inner peripheral surface 3 is indicated by an imaginary line (two-dot chain line). As shown in FIG. 3, the elastic member 20 is a cylindrical rubber member having an axial dimension Y larger than a radial thickness dimension t (t <Y).

  The elastic member 20 of the present embodiment extends radially inward from the axial end of the elastic main body 29 in addition to the cylindrical elastic main body 29 covering the first outer peripheral surface 31. It has an annular elastic portion 28. The annular elastic portion 28 covers a part of the side surface 12b of the outer race 12. The thickness t in the radial direction of the elastic member 20 is the thickness of the elastic body 29. The thickness t of the elastic member 20 is constant in the axial direction, and also constant in the circumferential direction. The axial dimension Y of the elastic member 20 has a constant value in the circumferential direction.

  The shape of the outer peripheral surface 30 of the outer ring 12 will be described. The outer peripheral surface 30 has a first outer peripheral surface portion 31 provided with the elastic member 20 and a second outer peripheral surface portion 32 not provided with the elastic member 20 and exposed to the outside in the radial direction. That is, the elastic member 20 is provided only on a part of the outer peripheral surface 30 (the first outer peripheral surface 31), and the other part (the second outer peripheral surface 32) of the outer peripheral surface 30 is an outer peripheral surface of the material of the outer ring 12, that is, It has a metal surface. In the embodiment shown in FIG. 2, the first outer peripheral surface portion 31 is wider than the second outer peripheral surface portion 32.

The outer peripheral surface 30 of the outer ring 12 is a stepped surface, and the second outer peripheral surface 32 has a larger diameter than the first outer peripheral surface 31. An inclined surface 33 is interposed between the first outer peripheral surface portion 31 and the second outer peripheral surface portion 32. The elastic member 20 is provided over the entire range from the axial middle portion 33 a of the inclined surface 33 to the first outer peripheral surface portion 31.
As described above, the outer peripheral surface 30 of the outer race 12 is a part of the outer peripheral surface 30 where the elastic member 20 is provided, and the first outer peripheral surface part 31 which is another part of the outer peripheral surface 30. And a second outer peripheral surface portion 32 having a diameter larger than 31.

  As shown in FIG. 2, the second outer peripheral surface portion 32 occupies substantially half of the outer peripheral surface 30 and is continuous with the side surface 12c on one side in the axial direction. The first outer peripheral surface portion 31 occupies the remaining portion of the outer peripheral surface 30 and is continuous with the other side surface 12b in the axial direction. Thereby, the elastic member 20 has a configuration covering the remaining area (the first outer peripheral surface portion 31) of the outer peripheral surface 30 excluding one side in the axial direction (the second outer peripheral surface portion 32), and has a longitudinal section as shown in FIG. , The outer ring 12 has a left-right asymmetric configuration.

  When the rolling bearing 7 is attached to the housing 2, the elastic member 20 fixed to the first outer peripheral surface portion 31 contacts the inner peripheral surface 3 of the housing, and the elastic member 20 is elastically deformed in the radial direction. It is in. That is, as shown in FIG. 3, the elastic member 20 has a crushing allowance (tightening allowance) G. The crushing allowance G can be set, for example, in the range of 0.05 to 0.1 mm.

On the other hand, the second outer peripheral surface portion 32 is fitted to the housing inner peripheral surface 3 with a gap K therebetween. The gap K is set in the range of zero to several tens of μm, and the second outer peripheral surface portion 32 is in a state of being fitted with the inner peripheral surface 3 of the housing.
As described above, in the rolling bearing 7 of the present embodiment, the elastic member 20 provided on a part of the outer peripheral surface 30 (the first outer peripheral surface portion 31) of the outer race 12 and the other portion of the outer peripheral surface 30 (the second outer peripheral surface portion). 32), a bearing outer peripheral surface 40 fitted to the housing inner peripheral surface 3 is formed.

According to the rolling bearing 7, the displacement of the rolling bearing 7 (the outer ring 12) in the circumferential direction with respect to the housing inner peripheral surface 3 (hereinafter, also referred to as creep) can be suppressed by the frictional resistance of the elastic member 20. By virtue of the elastic member 20 functioning as a damper, it is possible to make it difficult to transmit vibration due to bearing rotation to the housing 2 (that is, to attenuate the vibration). By making it difficult for the vibration to be transmitted to the housing 2, it is possible to suppress noise generated from the housing 2. In particular, since the elastic member 20 has a cylindrical shape having an axial dimension Y larger than the thickness dimension t in the radial direction (t <Y), the elastic member 20 has a wide range of friction against the housing inner peripheral surface 3. Resistance can be provided, creep can be effectively suppressed, and a configuration in which vibration is not easily transmitted to the housing 2 can be obtained.
Further, when a load (particularly having a radial component) is applied to the rolling bearing 7, the load can be transmitted to the housing 2 on the second outer peripheral surface portion 32 where the elastic member 20 is not provided, and Stiffness is maintained.

  As described above, the outer peripheral surface 30 of the outer race 12 has a stepped shape having the first outer peripheral surface portion 31 having a small diameter and the second outer peripheral surface portion 32 having a large diameter. The elastic member 20 is provided on the first outer peripheral surface portion 31 having a small diameter, and the second outer peripheral surface portion 32 having a large diameter can directly contact the inner peripheral surface 3 of the housing (that is, the second outer peripheral surface portion 32 has a metal surface). Surface contact).

According to this configuration, the elastic member 20 has the thickness dimension t, so that it is easy to secure the predetermined crushing allowance G in the radial direction, and the function of suppressing creep can be enhanced.
If the outer diameters of the first outer peripheral surface portion 31 and the second outer peripheral surface portion 32 are equal, the thickness t of the elastic member 20 depends on the value of the interference G, the second outer peripheral surface portion 32, and the housing inner peripheral surface 3. It becomes the sum of the value of the gap K and these values are both small as described above, so that the thickness (t) of the elastic member 20 becomes extremely thin. However, as described above, by providing the elastic member 20 on the first outer peripheral surface portion 31 having a small diameter, the thickness t of the elastic member 20 is made larger than the sum of the value of the interference G and the value of the gap K. be able to. Thereby, the elastic member 20 can be easily vulcanized and bonded to the outer ring 12 and molded, and the elastic member 20 can have strength (particularly, peeling strength), and the work of attaching the rolling bearing 7 is also facilitated. .
The outer race 12 of the present embodiment is fitted to the housing inner peripheral surface 3 in a state of being fitted in the second outer peripheral surface portion 32 having a large diameter with a clearance fit. Since direct contact is possible, a configuration for maintaining the rigidity of the bearing is obtained.

  Further, in the case of the conventional technique shown in FIG. 5, it is necessary to form the hole 96 in the housing 97. However, according to the rolling bearing 7 of the present embodiment, such a hole is not required. Further, in the related art, a step of pouring the adhesive through the hole 96 and drying the adhesive is required. However, according to the rolling bearing 7 of the present embodiment, such a step is unnecessary.

  Further, in the rolling bearing 7 of the present embodiment, the diameter of the elastic member 20 on the outer peripheral side of the edge 21 on one side in the axial direction (the right side in FIG. 3) decreases toward the end 22 on the one side in the axial direction. A first reduced diameter surface (inclined surface) 23 is provided. Further, on the outer peripheral side of the edge portion 25 on the other axial side (the left side in FIG. 3) of the elastic member 20, a second diameter-reduced surface (the diameter decreases toward the end 26 on the other axial side). An inclined surface 24 is provided.

To describe one side (right side) in the axial direction of the rotating device 1 shown in FIG. 1, as described above, the housing inner peripheral surface 3 is provided with the annular portion 5 b, and between the annular portion 5 b and the outer ring 12. Has a preload spring 6 interposed. The preload spring 6 needs to push the side surface 12c of the outer race 12 in the axial direction. Therefore, in the present embodiment, the surface to be brought into contact with the preload spring 6 is the side surface 12 c continuous with the second outer peripheral surface portion 32.
This is because the elastic member 20 has the annular elastic portion 28 that covers a part of the side surface 12b that is continuous with the first outer peripheral surface portion 31. That is, if the preload spring 6 presses the side surface 12b of the outer ring 12 which is covered by the annular elastic portion 28, it is difficult to set a predetermined preload due to the presence of the annular elastic portion 28. is there.

In addition, with respect to the other side in the axial direction (the left side in FIG. 1), the side surface 12 c continuous with the second outer peripheral surface portion 32 of the outer ring 12 comes into contact with the annular portion 5 a by the action of the preload spring 6. If the annular elastic portion 28 of the elastic member 20 intervenes between the annular portion 5a and the outer ring 12, it is difficult to set the preload. Therefore, the side surface 12c that is continuous with the second outer peripheral surface portion 32, instead of the side surface 12b that is continuous with the first outer peripheral surface portion 31 to which the elastic member 20 is fixed, is a surface that is brought into contact with the annular portion 5a.
As described above, the surface of the outer ring 12 that comes into contact with the member used for applying the axial preload, such as the preload spring 6 and the annular portion 5a, from the axial direction is continuous with the second outer peripheral surface portion 32 and This is the side surface 12c. This facilitates the setting of the axial preload on the rolling bearing 7.

Further, in FIG. 1, for example, when the rolling bearing 7 on one axial side (right side) is axially moved along the housing inner peripheral surface 3 to be attached to the housing inner peripheral surface 3, an arrow G <b> 1 is shown. The direction is the moving direction. In this case, since the first reduced-diameter surface 23 is provided on the front side in the movement direction indicated by the arrow G1 among the elastic members 20 in the rolling bearing 7, the outer race to which the elastic member 20 is fixed is provided. When the outer ring 12 is moved in the axial direction with respect to the inner circumferential surface 3 of the housing, the outer ring 12 is easily attached because the first reduced diameter surface 23 functions as a guide surface.
Further, in a state where the mounting is completed, the space outside in the radial direction of the first reduced-diameter surface 23 functions as a space for releasing a part of the elastic member 20 which is pushed by the housing inner peripheral surface 3 and elastically deforms. The elastic member 20 can be easily deformed.

  In the embodiment shown in FIG. 1, the direction in which the rolling bearing 7 is moved in the axial direction for assembly is the direction shown by the arrow G <b> 1, but may be the opposite direction. In this case, the direction is provided on the elastic member 20. The second reduced diameter surface 24 is on the front side in the moving direction. Also in this case, the second reduced diameter surface 24 can function as a guide surface, and mounting of the outer ring 12 is facilitated. Further, the second reduced diameter surface 24 can function as a space for allowing a part of the elastic member 20 that is elastically deformed to escape.

  As described above (see FIG. 3), the inclined surface 33 is interposed between the first outer peripheral surface portion 31 and the second outer peripheral surface portion 32. Therefore, the space outside the inclined surface 33 in the radial direction can be made to function as a space for releasing a part of the elastic member 20 which is pushed by the housing inner peripheral surface 3 and is elastically deformed. Can be deformed.

  In the embodiment shown in FIG. 2, the elastic member 20 is provided on a virtual extension line L1 passing through a contact point P1 between the inner raceway groove 11a and the ball 13 and a contact point Q1 between the ball 13 and the outer raceway groove 12a. Have been. That is, the axial dimension Y of the elastic member 20 is set so that the virtual extension line L1 passes through the elastic member 20. When the rolling bearing 7 is mounted between the housing 2 and the rotating shaft 4, an axial preload is set. Therefore, the virtual extension line L1 is located at the center line of the rolling bearing 7. The virtual extension line L1 is inclined with respect to the orthogonal line, and the inclined virtual extension line L1 passes through the elastic member 20. With this configuration, it is possible to enhance the function of making it difficult to transmit vibration due to bearing rotation, that is, rotational vibration of the shaft / bearing system, to the housing 2.

FIG. 4 is a sectional view showing a modification of the rolling bearing 7 shown in FIG. In the rolling bearing 7 shown in FIG. 4, the first outer peripheral surface portion 31 is narrower than the second outer peripheral surface portion 32, and the axial dimension Y of the elastic member 20 is shorter than that in the embodiment shown in FIG. I have. Others are the same.
As shown in FIG. 4, the elastic member 20 is placed on a virtual extension line L2 passing through a contact point P2 between the inner raceway groove 11a and the ball 13 and a contact point Q2 between the ball 13 and the outer raceway groove 12a. The second outer peripheral surface portion 32 which is not present but is exposed is provided. In the case of this configuration, when a load (particularly including a radial component) is applied to the rolling bearing 7, the load can be transmitted to the housing 2 at the exposed second outer peripheral surface portion 32, and the bearing The rigidity can be further increased.

The embodiments disclosed as above are illustrative in all aspects and not restrictive. That is, the rolling bearing of the present invention is not limited to the illustrated embodiment, but may be another embodiment within the scope of the present invention. For example, the rolling bearing may be an angular ball bearing, and the rolling element may be other than a ball, and may be a cylindrical roller or a tapered roller.
In FIG. 1, the rolling bearing 7 has been described as a preload applying type bearing for a motor. However, the rolling bearing 7 may be other than for a motor, and the rolling bearing of the present invention has both problems of creep and vibration (noise). The present invention can be applied to rotating equipment.

  Further, in the above-described embodiment (see FIG. 3), the case where the diameter-reducing surfaces (inclined surfaces in the embodiment) 23 and 24 are provided on the outer peripheral side of each of the both edges in the axial direction of the elastic member 20 has been described. Alternatively, the elastic member 20 may be provided with a reduced diameter surface on only one of both axial edges. That is, it is sufficient that at least one of the both edges in the axial direction of the elastic member 20 is provided with a reduced diameter surface (inclined surface) whose diameter decreases toward the axial end surface.

1: rotating device 2: housing 3: housing inner peripheral surface (inner peripheral surface)
4: rotating shaft (shaft) 11: inner ring 12: outer ring 13: ball (rolling element) 20: elastic member 21 one axial edge 22: one axial end 23, 24: reduced diameter surface 25: Edge on the other side in the axial direction 26: End on the other side in the axial direction 30: Outer peripheral surface 31: First outer peripheral surface portion 32: Second outer peripheral surface portion 40: Bearing outer peripheral surface t: Thickness dimension Y: Axial dimension P1, P2 : Contact point Q1, Q2: Contact point L1, L2: Virtual extension line

Claims (1)

An inner ring mounted externally on the shaft; an outer ring mounted on the inner peripheral surface of the housing; a plurality of rolling elements interposed between the inner ring and the outer ring; and a part of the outer peripheral surface of the outer ring. A cylindrical elastic member provided along the circumferential direction in the first outer peripheral surface portion and having an axial dimension larger than a radial thickness dimension;
An outer peripheral surface of the elastic member and a second outer peripheral surface portion which is another portion of the outer peripheral surface of the outer ring constitute a bearing outer peripheral surface fitted to the inner peripheral surface of the housing,
Between the first outer peripheral surface and the second outer peripheral surface, there is an inclined surface whose diameter increases toward the second outer peripheral surface, which is one side in the axial direction,
The elastic member is provided over the entire range of the first outer peripheral surface portion from the inclined surface to the side surface on the other axial side of the outer ring,
A rolling bearing, wherein a reduced-diameter surface whose diameter decreases toward one axial side is provided on an outer peripheral side of one edge in the axial direction of the elastic member.

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