JP2012042031A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device that can suppress slide resistance between a radial cage and a thrust raceway ring.SOLUTION: The thrust raceway ring 31 of a thrust rolling bearing 3 has a first raceway surface 31a1 opposing the end face 53a of a planetary gear 53, and a second raceway surface 31a2 opposing the end face 22a1 outside the axial direction of the radial cage 22 at the inside of the radial direction of the first raceway surface 31a1. The thrust rolling bearing 3 includes: a plurality of thrust needle-shaped rollers 321 which are rollingly arranged between the first raceway surface 31a1 and the end face 53a of the planetary gear 53; an annular first thrust cage 322 which holds the thrust needle-shaped rollers 321 along the circumferential direction at prescribed intervals; a plurality of thrust balls 331 which are rollingly arranged between the second raceway surface 31a2 and the end face 22a1 of the radial cage 22; and an annular thrust cage 332 which holds the thrust balls 331 along the circumferential direction at prescribed intervals.

Description

  The present invention relates to a bearing device including a radial rolling bearing that supports a radial load and a thrust rolling bearing that supports a thrust load.

  For example, in a transmission of an automobile, a bearing device that supports a planetary gear (planetary gear) rotatably with respect to a shaft body includes a radial rolling bearing that supports a radial load and a thrust rolling bearing that supports a thrust load. It is known (see, for example, Patent Document 1).

  In order to avoid the radial cage of the radial rolling bearing and the thrust cage of the thrust rolling bearing from interfering with each other, the bearing device of Patent Document 1 is arranged axially on the inner peripheral portion of the thrust raceway ring of the thrust rolling bearing. An extension that is bent inward is formed, and the thrust race is disposed close to the radial cage.

JP-A-2-163509

In the bearing device, the radial cage and the thrust raceway ring are arranged close to each other in the axial direction. Therefore, the radial cage has an end surface on the outer side in the axial direction of the side surface of the extension portion of the thrust raceway ring. Rotates while sliding. For this reason, there is a problem that the bearing torque increases due to the sliding resistance between the radial cage and the thrust raceway.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a bearing device that can suppress sliding resistance between the radial cage and the thrust raceway.

  In order to achieve the above object, the bearing device of the present invention has a small-diameter portion and a large-diameter portion larger in diameter than the small-diameter portion around the axis of the small-diameter portion of the shaft body formed adjacent to the axial direction. A bearing device that rotatably supports the annular member, wherein the bearing device includes a plurality of radial rollers that are rotatably arranged between an outer peripheral surface of the small-diameter portion and an inner peripheral surface of the annular member. A radial rolling bearing having an annular radial cage that holds the radial roller at predetermined intervals along the circumferential direction, and a first raceway that faces an end surface of the annular member on the large-diameter portion side of the annular member A plurality of thrust raceways having a second raceway surface facing a surface and an axially outer end face of the radial cage, and a plurality of roll raceways disposed between the first raceway face and the end face of the annular member. Thrust roller and this thrust roller along the circumferential direction An annular first thrust retainer that is held at predetermined intervals, a plurality of thrust balls that are rotatably arranged between the second raceway surface and the end surface of the radial retainer, and the thrust balls And a thrust rolling bearing having an annular second thrust retainer that is retained at predetermined intervals along the circumferential direction.

  According to the present invention, a plurality of thrust balls arranged so as to roll between the second raceway surface of the thrust raceway and the axially outer end surface of the radial cage, and the thrust balls along the circumferential direction. Thus, the axially outer end face of the radial retainer can be rotatably supported with respect to the thrust raceway ring by the second thrust retainer retained at predetermined intervals. Thereby, it is possible to suppress an increase in bearing torque due to sliding resistance between the radial cage and the thrust raceway.

The second thrust retainer holds the thrust ball in a non-detachable manner, and the thrust raceway abuts on the second thrust retainer, and the second thrust retainer is detached from the thrust raceway. It is preferable to have a regulating part that regulates the above.
According to this configuration, the second thrust retainer that holds the thrust ball so as not to be detached can be regulated so as not to be detached from the thrust raceway by the restricting portion, so that the thrust raceway, the thrust ball, and the second thrust retainer The vessel can be previously unitized. Thereby, the assembly man-hour of a thrust rolling bearing can be reduced.

  According to the bearing device of the present invention, the axially outer end face of the radial cage can be rotatably supported with respect to the thrust raceway, so that the bearing torque is generated by the sliding resistance between the radial cage and the thrust raceway. Can be prevented from increasing.

It is sectional drawing which shows the planetary gear mechanism provided with the bearing apparatus which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a principal part expanded sectional view of FIG. 1 which shows a bearing apparatus.

Hereinafter, embodiments of the bearing device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a planetary gear mechanism provided with a bearing device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 and 2, a planetary gear mechanism 50 is used, for example, in a transmission of an automobile, and includes a sun gear 51 fitted to a rotating shaft 61 and a ring arranged concentrically with the sun gear 51. A gear 52 and a plurality (three in this embodiment) of planetary gears (annular members) 53 disposed between the sun gear 51 and the ring gear 52 are provided.

  The planetary gear 53 is supported by the bearing device 1 so as to be rotatable around the axis of the small diameter portion 62a of the shaft (shaft body) 62. The shaft 62 is formed by fitting both ends in the axial direction of the small diameter portion 62a to a pair of large diameter portions (carriers) 62b. The small diameter portion 62a and the large diameter portion 62b having a larger diameter than the small diameter portion 62a Are formed adjacent to each other in the axial direction. The bearing device 1 includes a radial rolling bearing 2 that supports a radial load and a pair of thrust rolling bearings 3 that support a thrust load.

  FIG. 3 is an enlarged cross-sectional view of a main part of FIG. The radial rolling bearing 2 of the bearing device 1 includes a plurality of radial needle rollers 21 disposed between the small-diameter portion 62a of the shaft 62 and the planetary gear 53, and the radial needle rollers 21 arranged at predetermined intervals along the circumferential direction. An annular radial holder 22 is provided for holding each. The radial needle roller 21 is disposed between the outer peripheral surface 62a1 of the small diameter portion 62a and the inner peripheral surface 53b of the planetary gear 53 so as to be able to roll.

  The radial cage 22 extends between the pair of annular portions 22a (see FIG. 1) disposed at both ends in the axial direction and the annular portions 22a in the axial direction and at predetermined intervals along the circumferential direction. And a plurality of column portions 22b which are arranged and connect the two annular portions 22a. A radial needle roller 21 is accommodated in a pocket 22c surrounded by the adjacent column portion 22b and a pair of annular portions 22a.

  The thrust rolling bearing 3 is disposed between the end surface 53a of the planetary gear 53 on the large diameter portion 62b side and the end surface 62b1 of the large diameter portion 62b on the planetary gear 53 side. The thrust rolling bearing 3 includes a thrust race ring 31, a thrust roller bearing portion 32, and a thrust ball bearing portion 33.

  The thrust raceway ring 31 includes an annular raceway portion 31a disposed along the end surface 62b1 of the large-diameter portion 62b, a cylindrical inner flange portion 31b extending inward in the axial direction from the radially inner peripheral end of the raceway portion 31a, It has a cylindrical outer flange portion 31c extending inward in the axial direction from the radial intermediate portion of the track portion 31a.

  The track portion 31a includes a first track surface 31a1 facing the end surface 53a of the planetary gear 53 on the radially outer side of the outer flange portion 31c, and an axially outer side of the annular portion 22a on the radially inner side of the outer flange portion 31c. And a second raceway surface 31a2 facing the end surface 22a1. The inner flange portion 31 b is fitted to the shaft 62.

  The thrust roller bearing portion 32 includes a plurality of thrust needle rollers 321 that are rotatably disposed between the first raceway surface 31a1 of the thrust raceway ring 31 and the end surface 53a of the planetary gear 53, and the thrust needle roller 321. And an annular first thrust retainer 322 that retains at predetermined intervals along the circumferential direction.

  The first thrust retainer 322 includes a first outer annular portion 322a disposed on the radially outer side, a first inner annular portion 322b disposed on the radially inner side, and a space between the annular portions 322a and 322b. And a plurality of first pillar portions 322c that are arranged at predetermined intervals along the circumferential direction and connect the two annular portions 322a and 322b.

  The first thrust retainer 322 includes a first pocket 322d surrounded by the adjacent first pillar portion 322c, first outer annular portion 322a, and first inner annular portion 322b. A plurality of radial needles are formed over the entire circumference, and thrust needle rollers 321 are accommodated in the first pockets 322d.

  A protruding portion 322b1 protruding radially inward is formed at the inner peripheral end of the first inner annular portion 322b. The inner peripheral surface of the projecting portion 322b1 is configured to rotate and guide the first thrust retainer 322 by sliding on the outer peripheral surface of the outer flange portion 31c of the thrust raceway ring 31.

  The thrust raceway ring 31 has a first restricting portion 31 d that restricts the first thrust retainer 322 from coming into contact with and being separated from the thrust raceway ring 31. The first restricting portion 31d is formed to extend radially outward from the axial end portion of the outer flange portion 31c, and its radially outer end portion is radially outward from the inner peripheral end of the protruding portion 322b1. Has been placed. Accordingly, the first restricting portion 31d restricts the first thrust retainer 322 from being detached from the thrust raceway ring 31 by the protrusion 322b1 coming into contact with the side surface thereof.

  The thrust ball bearing portion 33 includes a plurality of thrust balls 331 that are rotatably arranged between the second raceway surface 31 a 2 of the thrust raceway ring 31 and the end surface 22 a 1 of the radial cage 22, and the thrust ball 331 has a circumference. And an annular second thrust retainer 332 that is retained at predetermined intervals along the direction.

  The second thrust retainer 332 includes a second outer annular portion 332a disposed on the radially outer side, a second inner annular portion 332b disposed on the radially inner side, and the two annular portions 332a and 332b. And a plurality of second column portions 332c that extend in the radial direction and are arranged at predetermined intervals along the circumferential direction and connect the two annular portions 332a and 332b.

  The second thrust retainer 332 includes a second pocket 332d surrounded by the adjacent second pillar portion 332c, second outer annular portion 332a, and second inner annular portion 332b. A plurality of radial balls are formed over the entire circumference, and a thrust ball 331 is accommodated in the second pocket 332d.

  The second thrust holder 332 holds the thrust ball 331 so as not to be detached. Specifically, arc surfaces 332a1 and 332b1 that hold the thrust ball 331 with a gap are formed on the inner peripheral surface of the second outer ring portion 332a and the outer peripheral surface of the second inner ring portion 332b, respectively. The thrust ball 331 is forcibly fitted between the pair of arcuate surfaces 332a1 and 332b1, thereby preventing the thrust ball 331 from being detached from the second thrust holder 332.

  The thrust raceway ring 31 has a second restriction portion (restriction portion) 31e that restricts the second thrust retainer 332 from coming into contact with the thrust raceway ring 31 and separating from the thrust raceway ring 31. The second restricting portion 31e is formed to extend radially outward from the axial end portion of the inner flange portion 31b and to extend radially inward from the axial end portion of the outer flange portion 31c. And the outer regulating portion 31e2.

  The radially outer end portion of the inner restricting portion 31e1 is disposed on the radially outer side than the inner peripheral end of the second inner annular portion 332b of the second thrust retainer 332. The radially inner end of the outer restricting portion 31e2 is disposed radially inward from the outer peripheral end of the second outer annular portion 332a of the second thrust retainer 332. As a result, the second outer ring part 332a and the second inner ring part 332b of the second thrust retainer 332 are in contact with the side surfaces of the inner restriction part 31e1 and the outer restriction part 31e2 of the second restriction part 31e, respectively. The second thrust retainer 332 is restricted from being separated from the thrust race 31.

  As described above, according to the bearing device 1 according to the embodiment of the present invention, a plurality of rolling elements disposed between the second raceway surface 31a2 of the thrust raceway ring 31 and the end surface 22a1 on the axially outer side of the radial cage 22 are rollable. The end face 22a1 of the radial holder 22 can be rotated with respect to the thrust raceway ring 31 by the thrust ball 331 and the second thrust holder 332 that holds the thrust ball 331 at predetermined intervals along the circumferential direction. Can be supported. Thereby, it is possible to suppress an increase in bearing torque due to a sliding resistance between the radial cage 22 and the thrust race 31.

  In addition, since the second thrust retainer 332 that holds the thrust ball 331 so as not to be detached can be regulated so as not to be separated from the thrust raceway ring 31 by the second regulating portion 31e, the thrust raceway ring 31, the thrust ball 331, and By setting the second thrust retainer 332 in a unitized state in advance, the number of assembling steps for the thrust rolling bearing 3 can be reduced.

  The present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications. For example, in the above embodiment, the thrust ball 331 rolls on the end surface 22a1 of the annular portion 22a of the radial cage 22, but a race ring on which the thrust ball 331 rolls may be provided on the end surface 22a1.

1: Bearing device, 2: Radial rolling bearing, 3: Thrust rolling bearing, 21: Radial needle roller (radial roller), 22: Radial cage, 31: Thrust raceway ring, 31a1: First raceway surface, 31a2: No. 2 raceway surfaces, 31e: restriction part, 53: planetary gear (annular member), 62: shaft (shaft body), 62a: small diameter part, 62b: large diameter part, 321: thrust needle roller (thrust roller), 322: First thrust cage, 331: Thrust ball, 332: Second thrust cage

Claims (2)

A bearing device that rotatably supports an annular member around an axis of the small-diameter portion of a shaft body in which a small-diameter portion and a large-diameter portion larger in diameter than the small-diameter portion are formed adjacent to each other in the axial direction. ,
The bearing device includes a plurality of radial rollers arranged to roll between an outer peripheral surface of the small diameter portion and an inner peripheral surface of the annular member, and the radial rollers at predetermined intervals along a circumferential direction. A radial rolling bearing having an annular radial cage for holding;
A thrust raceway ring having a first raceway surface facing the end surface on the large-diameter portion side of the shaft body in the annular member and a second raceway surface facing an end surface on the axially outer side of the radial cage; and the first track. A plurality of thrust rollers disposed so as to be able to roll between a surface and the end surface of the annular member, and an annular first thrust retainer for retaining the thrust rollers at predetermined intervals along the circumferential direction; A plurality of thrust balls that are rotatably arranged between the second raceway surface and the end surface of the radial cage, and a second annular ball that holds the thrust balls at predetermined intervals along the circumferential direction. And a thrust rolling bearing having a thrust retainer. The second thrust retainer holds the thrust ball in an inseparable manner;
2. The bearing device according to claim 1, wherein the thrust raceway ring has a restricting portion that abuts on the second thrust retainer and restricts the second thrust retainer from being detached from the thrust raceway ring.

Images