JP2012047257A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing that can suppress the damage of a retainer even when whirling vibration due to eccentricity occurs in a rotation ring.SOLUTION: The retainer 5 includes: a first annular part 5a rotatably guided while coming into contact with a flange part 2b at a fixing part of a fixing ring 2; a plurality of pillars 5b arranged in a state of projecting inward in a radial direction from the first annular part 5a; and a second annular part 5c arranged in a state of being separated from a protruding end surface 5b2 of the pillars 5b inward in the radial direction.

Description

  The present invention relates to a thrust roller bearing used in, for example, a torque converter.

  For example, a torque converter constituting an automobile transmission is provided with a thrust roller bearing that supports a thrust load between a stator and an impeller. As a retainer for this thrust roller bearing, one in which pockets for accommodating rollers are formed through a plurality of locations in the circumferential direction of a single annular plate is known (for example, see Patent Document 1).

  FIG. 4 is a cross-sectional view of a conventional thrust roller bearing provided with such a cage. The thrust roller bearing 100 is provided between the stator 201 and the impeller 202 of the torque converter 200, and has a cross-sectionally shaped fixed ring 101 fitted to the stator 201, and a cross-sectional face fitted to the impeller 202. -Shaped rotating wheel 102, a plurality of cylindrical rollers 103 that are rotatably disposed between fixed wheel 101 and rotating wheel 102, and holding cylindrical rollers 103 at predetermined intervals along the circumferential direction. Device 104.

  The cage 104 has an annular first annular portion 104a disposed on the radially outer side, an annular second annular portion 104b disposed on the radially inner side, and a diameter between both annular portions 104a and 104b. And a plurality of column portions 104c that extend in the direction and are arranged at predetermined intervals in the circumferential direction and connect the two annular portions 104a and 104b. The cylindrical roller 103 is accommodated in a pocket 104d surrounded by the adjacent column part 104c and both annular parts 104a and 104b. The retainer 104 is rotatably guided when the outer peripheral surface of the first annular portion 104 a is in sliding contact with the inner peripheral surface of the flange portion 101 a of the fixed ring 101.

JP 2004-21824 A

  In the thrust roller bearing 100, for example, if the accuracy of the dimensions of the parts constituting the torque converter 200 varies, the axis center of the rotating wheel 102 (impeller 202 side) is the axis center of the fixed wheel 101 (stator 201 side). May be eccentric. When such eccentricity occurs, the outer peripheral surface 102a1 of the flange portion 102a of the rotating wheel 102 may come into contact with the inner peripheral surface 104b1 of the second annular portion 104b due to the rotating wheel 102 swinging around.

In this case, since the second annular portion 104b of the cage 104 that rotates at a low speed tends to be rotated together with the rotating wheel 102 on the impeller 202 side that rotates at a high speed, the column portion 104c of the cage 104 is caused by this rotating force. In this case, an excessive load is applied to the cage 104 and the cage 104 is damaged.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a thrust roller bearing that can prevent the cage from being damaged even if the rotating wheel is swung due to eccentricity. To do.

  In order to achieve the above object, a thrust roller bearing according to the present invention comprises an annular flat plate-like fixed side raceway portion and a cylindrical fixed side flange portion extending in the axial direction from one radial end portion of the fixed side raceway portion. A fixed ring having an annular flat plate-like rotation-side track portion that is axially opposed to the fixed-side track portion, and a cylindrical rotation-side flange portion that is radially opposed to the fixed-side flange portion; A rotating wheel relatively rotatable with respect to the fixed wheel, a plurality of rollers arranged to roll between the fixed side raceway portion and the rotation side raceway portion, and the roller circumferentially A thrust roller bearing comprising: a retainer that retains at predetermined intervals along the direction, wherein the retainer is slidably in contact with the fixed-side flange portion and rotated and guided; Arranged at predetermined intervals along the circumferential direction while projecting radially from the first annular part. A plurality of pillar portions which are characterized by having a second annular parts arranged in an isolated state, against the pillar portion.

  According to the thrust roller bearing of the present invention, since the second annular portion is arranged in a state separated from the column portion, the rotating wheel is swung by eccentricity, and the rotation-side flange portion is the second flange portion. Even if it comes into contact with the annular portion, only the second annular portion is rotated along with the rotating wheel. Thereby, it can reduce that an excessive load acts on the pillar part of a cage by rotation of a rotating wheel. Therefore, it is possible to suppress the cage from being damaged even if the rotating wheel is swung by eccentricity.

The fixed ring further includes an annular flat plate-shaped shim disposed between the fixed ring or the rotating wheel and the roller, and the fixed ring is separated from the fixed ring by abutting one end in the radial direction of the shim. A fixed-side restricting portion that restricts the rotation, and the rotating wheel has a rotating-side restricting portion that restricts the other end in the radial direction of the shim from coming into contact with the rotating wheel. Is preferred.
According to this configuration, since the shim can be prevented from being separated from the fixed wheel and the rotating wheel, the integrated thrust in which the fixed wheel, the rotating wheel, and the cage disposed between the two wheels are not separated. It can be a roller bearing. Thereby, since each component of a thrust roller bearing can be made into the united state previously, the assembly man-hour of a thrust roller bearing can be reduced.

  The second annular portion is preferably made of a resin material. According to this configuration, since the frictional resistance between the second annular portion and the rotating wheel can be reduced, the bearing torque can be effectively reduced.

  Moreover, it is preferable that the said 2nd ring part is surface-treated to reduce a friction coefficient. Also in this case, since the frictional resistance between the second annular portion and the rotating wheel can be reduced, the bearing torque can be effectively reduced.

  According to the thrust roller bearing of the present invention, it is possible to reduce an excessive load from acting on the column portion of the cage, so that the cage can be damaged even if the rotating wheel is swung due to eccentricity. Can be suppressed.

It is principal part sectional drawing which shows the thrust roller bearing which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is principal part sectional drawing which shows the thrust roller bearing which concerns on the 2nd Embodiment of this invention. It is principal part sectional drawing which shows the conventional thrust roller bearing.

Hereinafter, embodiments of the thrust roller bearing of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing a thrust roller bearing according to a first embodiment of the present invention. This thrust roller bearing 1 is provided, for example, between a stator 51 and an impeller 52 of a torque converter 50 constituting an automobile transmission.

  The thrust roller bearing 1 includes a fixed ring 2 having an annular flat plate-like stationary side raceway portion 2a, and a rotating wheel having an annular flat plate-like rotational side raceway portion 3a facing the fixed side raceway portion 2a in the axial direction. 3, a plurality of cylindrical rollers 4 disposed between the fixed-side raceway portion 2a and the rotation-side raceway portion 3a so as to be freely rollable, and a cage that holds the cylindrical rollers 4 at predetermined intervals along the circumferential direction. And 5.

  The fixed ring 2 includes the fixed-side track portion 2a and a cylindrical fixed-side flange portion 2b extending in the axial direction from the outer peripheral end (one radial end portion) of the fixed-side track portion 2a. A fixed-side track surface 2a1 is formed on the axially inner side surface of the fixed-side track portion 2a. The fixed-side flange portion 2b is formed to extend in the axial direction from the outer peripheral end of the fixed-side raceway surface 2a1 toward the rotation-side track portion 3a, and the outer peripheral surface of the fixed-side flange portion 2b is fitted to the stator 51. Yes.

  The rotary wheel 3 is formed in a bowl shape in cross section, and has the rotary side raceway portion 3a and a cylindrical rotary side flange portion 3b extending in the axial direction from the inner peripheral end of the rotary side raceway portion 3a. Yes. A rotation side raceway surface 3a1 is formed on the side surface on the inner side in the axial direction of the rotation side raceway portion 3a. The rotation-side flange portion 3 b is formed to face the fixed-side flange portion 2 b in the radial direction, and the inner peripheral surface of the rotation-side flange portion 3 b is fitted to the rotation shaft 52 a of the impeller 52. Thereby, the rotating wheel 3 can be rotated relative to the fixed wheel 2.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and 2, the cage 5 is disposed between the fixed-side flange portion 2b and the rotation-side flange portion 3b, and an annular first annular portion 5a disposed on the radially outer side, It is comprised by the some pillar part 5b arrange | positioned at the radial inside of the 1 ring part 5a, and the cyclic | annular 2nd annular part 5c arrange | positioned at the radial inside of the pillar part 5b. The cylindrical roller 4 is accommodated in a pocket 5d formed so as to be surrounded by the adjacent column part 5b and the first and second annular parts 5a, 5c.

  The first annular portion 5a is rotationally guided by the outer peripheral surface 5a1 being in sliding contact with the inner peripheral surface of the fixed-side flange portion 2b. Each column portion 5b is arranged at predetermined intervals along the circumferential direction in a state of projecting radially inward from the inner circumferential surface of the first annular portion 5a. Further, a convex portion 5b1 that protrudes to one side in the axial direction (the right side in FIG. 1) is bent at an intermediate portion of each column portion 5b.

  The second annular portion 5c is disposed in a state where the outer peripheral surface 5c1 is separated radially inward from the protruding end surface 5b2 of the column portion 5b. Further, the inner peripheral surface 5c2 of the second annular portion 5c is disposed in a state where a gap is formed radially outward with respect to the outer peripheral surface of the rotation-side flange portion 3b.

  The first annular portion 5a, the column portion 5b, and the second annular portion 5c are formed of a resin material having a small friction coefficient. As a specific example of this resin material, it is preferable to use 46 nylon or 66 nylon.

  According to the thrust roller bearing 1 having the above configuration, the second annular portion 5c of the cage 5 is disposed in a state separated radially inward from the protruding end surface 5b2 of the column portion 5b. Even if the wheel 3 is swung by eccentricity and the rotation-side flange portion 3b comes into contact with the second annular portion 5c, only the second annular portion 5c rotates with the rotating wheel 3. Thereby, it can reduce that an excessive load acts on the pillar part 5b of the holder | retainer 5 by the accompanying rotation of the rotating wheel 3. FIG. Therefore, even if the rotating wheel 3 is swung around due to eccentricity, the cage 5 can be prevented from being damaged.

  Moreover, since the 2nd ring part 5c is formed with the resin material, the frictional resistance of the 2nd ring part 5c and the rotary wheel 3 can be reduced effectively. Thereby, bearing torque can be reduced effectively.

  FIG. 3 is a sectional view showing a thrust roller bearing according to a second embodiment of the present invention. The thrust roller bearing 1 of the present embodiment includes a shim 6 disposed between the rotation side raceway surface 3 a 1 of the rotating wheel 3 and the cylindrical roller 4. The shim 6 is formed in an annular flat plate shape from a metal such as carbon steel for machine structure. The shim 6 may be formed of a resin material such as 46 nylon or 66 nylon.

  The fixed ring 2 has a fixed-side restricting portion 2c that extends radially inward from the axial end of the fixed-side flange portion 2b. The fixed-side restricting portion 2c restricts the shim 6 from separating from the fixed wheel 2 to one axial side (the right side in FIG. 3) when the outer peripheral end 6a, which is one radial end portion of the shim 6, contacts. ing.

  The rotating wheel 3 has a rotation-side regulating portion 3c that extends radially outward from the axial end of the rotation-side flange portion 3b. The rotation side restricting portion 3c prevents the shim 6 from separating from the rotating wheel 3 to the other side in the axial direction (left side in FIG. 3) when the inner peripheral end 6b which is the other radial end of the shim 6 contacts. It is regulated.

  The 1st ring part 5a, the pillar part 5b, and the 2nd ring part 5c are formed with metals, such as carbon steel for machine structures. Further, the first annular portion 5a, the column portion 5b, and the second annular portion 5c are subjected to a surface treatment for reducing a friction coefficient. As a specific example of this surface treatment, it is preferably coated with DLC (diamond-like carbon) or PTFE (polytetrafluoroethylene).

  According to the thrust roller bearing 1 of the present embodiment configured as described above, the shim 6 can be prevented from being detached from the fixed wheel 2 and the rotating wheel 3, so that the fixed wheel 2, the rotating wheel 3, In addition, the integrated thrust roller bearing 1 in which the cage 4 disposed between the two wheels 2 and 3 is not separated can be obtained. Thereby, since each component of the thrust roller bearing 1 can be made into the united state previously, the assembly man-hour of the thrust roller bearing 1 can be reduced.

  Moreover, since the surface treatment which reduces a friction coefficient is given to the 2nd ring part 5c, the frictional resistance of the 2nd ring part 5c and the rotary wheel 3 can be reduced effectively. Thereby, bearing torque can be reduced effectively.

  The present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications. For example, the fixed wheel 2 of each of the above embodiments may be a rotating wheel, and the rotating wheel 3 may be a fixed wheel. In this case, the second annular portion 5c is the first annular portion, the first annular portion 5a is the second annular portion, and the column portion 5b is projected radially outward from the second annular portion 5c. They may be arranged and arranged in a state where the first annular part 5a is separated from the pillar part 5b.

  In the first embodiment, the first annular portion 5a, the column portion 5b, and the second annular portion 5c of the cage 5 are formed of a resin material, but at least a second circle that comes into contact with the rotating wheel 3 is used. The ring part 5c should just be formed with the said resin material.

  In the second embodiment, the first annular portion 5a, the column portion 5b, and the second annular portion 5c of the cage 5 are subjected to surface treatment for reducing the friction coefficient. The said surface treatment should just be given to the 2nd ring part 5c which contacts.

  Furthermore, in the second embodiment, the shim 6 is disposed between the rotating wheel 3 and the cylindrical roller 4, but may be disposed between the fixed wheel 2 and the cylindrical roller 4. Further, the rotation side restricting portion 3 c of the rotating wheel 3 may be formed at a position close to the inner peripheral end 6 b of the shim 6.

  1: thrust roller bearing, 2: fixed ring, 2a: fixed side raceway part, 2b: fixed side flange part, 2c: fixed side restricting part, 3: rotating wheel, 3a: rotary side raceway part, 3b: rotary side flange part 3c: Rotation side restricting portion, 4: Cylindrical roller (roller), 5: Cage, 5a: First annular portion, 5b: Column portion, 5c: Second annular portion, 6: Shim

Claims (4)

A stationary ring having an annular flat plate-shaped stationary side raceway portion and a cylindrical stationary side flange portion extending in the axial direction from one radial end portion of the stationary side raceway portion;
An annular flat plate-like rotation side raceway portion that is axially opposed to the fixed side raceway portion, and a cylindrical rotation side flange portion that is radially opposed to the fixed side flange portion, A rotating wheel that can rotate relative to a fixed wheel;
A plurality of rollers arranged to be freely rollable between the fixed side raceway portion and the rotation side raceway portion;
A thrust roller bearing comprising: a retainer for retaining the roller at predetermined intervals along the circumferential direction;
The cage is a first annular portion that is slidably contacted with the fixed flange portion, and a first annular portion,
A plurality of pillars arranged at predetermined intervals along the circumferential direction in a state protruding in the radial direction from the first annular part;
A thrust roller bearing comprising: a second annular portion disposed in a state of being separated from the column portion. Further comprising an annular flat plate-shaped shim disposed between the fixed ring or the rotating wheel and the roller;
The fixed wheel has a fixed-side restricting portion that restricts the one end of the shim in the radial direction from coming into contact with the fixed wheel,
The thrust according to any one of claims 1 to 3, wherein the rotating wheel has a rotation-side restricting portion that restricts the other end in the radial direction of the shim from coming into contact with and separating from the rotating wheel. Roller bearing.   The thrust roller bearing according to claim 1 or 2, wherein the second annular portion is formed of a resin material.   The thrust roller bearing according to claim 1, wherein the second annular portion is subjected to a surface treatment for reducing a friction coefficient.

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