JP2015031390A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing capable of reducing a lubricant which stagnates inside of a bearing, reducing a torque and increasing an amount of penetrating oil, while securing rigidity of a retainer.SOLUTION: A thrust roller bearing 1 includes: a retainer 5 having an annular portion 52 composed of an annular plate and provided with a plurality of pockets 51 in the circumferential direction, and a pair of flanges 53, 54 extended in an axial direction respectively from an outer peripheral edge part and an inner peripheral edge part of the annular portion 52; and a plurality of rollers 4 each locked in each of the pockets 51 and rotatably held. Here, lubricant is passed from the inner diameter side toward the outer diameter side. A plurality of cutouts 53a are formed in the circumferential direction in the retainer 5 in a state of radially penetrating the outer flange 53.

Description

  The present invention relates to a thrust roller bearing.

  Many thrust roller bearings are used in rotation support portions of automobile automatic transmissions and torque converters. In this thrust roller bearing, a plurality of pockets are provided in the circumferential direction of an annular cage, and the rollers are rotatably held in the pockets. And the lubricating oil is circulated through the rotation support portion incorporating the thrust roller bearing during operation, and the lubricating oil is penetrated from the inner diameter side toward the outer diameter side. The lubricating oil that has passed through the thrust roller bearing is supplied to adjacent members. When such a thrust roller bearing is used under severe conditions such as high speed operation, it is necessary to secure a sufficient amount of penetrating oil for cooling the thrust roller bearing and adjacent members and reducing wear. In addition, there is a need to reduce torque in thrust roller bearings in order to reduce the fuel consumption of automobiles, and in thrust roller bearings, it is desirable to reduce torque due to the stirring resistance of lubricating oil staying inside the bearings. ing.

  Thus, for example, Patent Document 1 discloses an invention in which the lubricant supplied from the inner diameter side is smoothly discharged from the outer diameter side by not providing a flange on the outer diameter side of the cage.

JP 2007-155059 A

  However, in the thrust roller bearing of the invention disclosed in Patent Document 1, since the flange is not provided on the outer diameter side of the cage, the rigidity of the cage is lowered. As a result, twisting occurs on the outer diameter side of the cage, and the cage may be locally worn at the portion where the cage contacts the roller. Therefore, the thrust roller bearing has been required to reduce the lubricating oil staying inside the bearing while ensuring the rigidity of the cage, thereby reducing the torque and increasing the amount of penetrating oil.

  The present invention has been made to solve such problems, and while reducing the amount of lubricating oil staying inside the bearing while ensuring the rigidity of the cage, the torque can be reduced and the amount of through oil can be increased. It is an object of the present invention to provide an intended thrust roller bearing.

  In order to solve the above-mentioned problems, the structural features of the thrust roller bearing according to claim 1 include an annular portion made of an annular plate and having a plurality of pockets formed in the circumferential direction, and an outer peripheral edge of the annular portion. A retainer having a pair of flanges extending in the axial direction from the inner periphery and the inner peripheral edge, and a plurality of rollers that are locked in the respective pockets and rotatably held, from the inner diameter side to the outer diameter side A thrust roller bearing through which lubricating oil penetrates, wherein the retainer is formed with a plurality of notches or through-holes in the circumferential direction penetrating the radial direction of the flange on the outer diameter side.

  In the thrust roller bearing according to the first aspect, the cage has a pair of flanges extending in the axial direction from the outer peripheral edge and the inner peripheral edge of the annular portion, so that the rigidity of the cage can be secured. Further, since the cage is formed with a plurality of notches or through holes in the circumferential direction penetrating the radial direction of the flange on the outer diameter side, the discharge of the lubricating oil staying inside the bearing is promoted and staying inside the bearing. Reduce lubricating oil. Thereby, the stirring resistance by the lubricating oil inside the bearing is reduced, and the torque can be reduced. In addition, since the amount of lubricating oil staying inside the bearing is reduced, the amount of through oil can be increased.

  A structural feature of the thrust roller bearing according to claim 2 is that the notch or the through hole is formed radially outward in a region between adjacent pockets.

  In the thrust roller bearing of the second aspect, the notch or the through hole is formed radially outward in the region between the adjacent pockets. As described above, since the notch or the through hole is formed at a position different from the rotation direction of the roller to which the load from the rotating roller and the rotation axis direction of the roller are different, the rigidity of the retainer is not affected. The rigidity of the vessel can be secured.

  According to the present invention, it is possible to provide a thrust roller bearing that reduces the amount of lubricating oil staying inside the bearing while ensuring the rigidity of the cage, thereby reducing torque and increasing the amount of penetrating oil.

1st Embodiment: It is sectional drawing of the thrust roller bearing of this invention. 1st Embodiment: It is the perspective view which showed the outline of the holder | retainer of FIG. 2nd Embodiment: It is sectional drawing of the thrust roller bearing of this invention. 2nd Embodiment: It is the perspective view which showed the outline of the holder | retainer of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a thrust roller bearing of the present invention is embodied will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a sectional view of a thrust roller bearing 1 of the present invention. FIG. 2 is a perspective view schematically showing the cage 5 of FIG.
As shown in FIGS. 1 and 2, the thrust roller bearing 1 includes a pair of race rings 2, 3, a plurality of rollers 4 that roll between the pair of race rings 2, 3, and the rollers 4. The cage 5 is movably held and is disposed between a rotating body (not shown) and a fixed housing (not shown).

  One raceway ring 2 is disposed on the rotating body side as an inner ring (upper side in FIG. 1), and is formed by an annular member made of, for example, a thin steel plate, and an inner ring raceway surface 2a is formed on the roller 4 side end face. One of the race rings 2 includes an annular inner ring rising portion 2b that rises from the inner peripheral edge portion of the inner ring raceway surface 2a, and an annular shape that is bent from the end of the inner ring rising portion 2b so as to face the inner peripheral edge portion of the cage 5. The inner ring bent portion 2c is provided.

  The other race ring 3 is arranged as an outer ring on the fixed housing side (lower side in FIG. 1), and is formed by an annular member made of, for example, a thin steel plate, and an outer ring raceway surface 3a is formed on the roller 4 side end surface. . The other raceway ring 3 has an annular outer ring rising portion 3b that rises from the outer peripheral edge portion of the outer ring raceway surface 3a, and an annular shape that is bent so as to face the outer peripheral edge of the cage 5 from the end of the outer ring rising portion 3b. An outer ring bent portion 3c is provided.

  The plurality of rollers 4 are disposed between the inner ring raceway surface 2a of one raceway ring 2 and the outer ring raceway surface 3a of the other raceway ring 3, and are formed by needle rollers made of bearing steel. The plurality of rollers 4 roll on the inner ring raceway surface 2 a and the outer ring raceway surface 3 a in a pocket 51 (described later) of the cage 5.

  The cage 5 is accommodated between one raceway ring 2 and the other raceway ring 3 and is entirely formed of an annular member made of a press-formed body of, for example, a galvanized steel plate. A circular ring portion 52 having a wave shape in the radial direction is provided in a radially intermediate region of the cage 5. The annular part 52 includes an intermediate projecting part 52c, an outer diameter side projecting part 52a, and an inner diameter side projecting part 52b that project in the radial direction alternately on one side and the other side in the axial direction of the cage 5. The intermediate overhanging portion 52c projects in one of the cage 5 in the axial direction, and the outer diameter side overhanging portion 52a and the inner diameter side overhanging portion 52b project in the other axial direction.

  In the annular portion 52 of the cage 5, pockets 51 having a rectangular shape in plan view are punched in the axial direction at several locations in the circumferential direction. The rollers 4 are housed in a non-separable state so as to be rotatable with respect to each pocket 51. That is, into the pocket 51 at three locations of the bulge apex portions of the outer diameter side overhanging portion 52a, the inner diameter side overhanging portion 52b, and the intermediate overhanging portion 52c located on the inner wall surface of the pocket 51 in the circumferential direction. Claws 52d, 52e, and 52f that protrude toward the surface are provided.

  By the claws 52d, 52e, 52f, the three radial positions in each pocket 51 are narrower than the diameter dimension of the roller 4, thereby preventing the roller 4 from coming out of each pocket 51. . The rollers 4 are stored in the pockets 51 by being forcibly fitted.

  The cage 5 is provided with a cylindrical inner flange 54 that extends from the inner peripheral edge of the annular portion 52 to one side in the axial direction and extends to the other side in the folded axial direction.

  The cage 5 is provided with a cylindrical outer flange 53 (an outer diameter side flange) extending from the outer peripheral edge of the annular portion 52 to one side in the axial direction. The outer flange 53 is formed with a notch 53a penetrating in the radial direction at a plurality of locations in the circumferential direction at the distal end of the region between the adjacent pockets 51 in the radial direction. The notch 53a is formed by partially reducing the height of the outer flange 53, and has a rectangular shape when viewed from the outer diameter side.

  In the thrust roller bearing 1 configured as described above, an annular gap P1 is formed on the inner diameter side and an annular gap P2 is formed on the outer diameter side between the pair of race rings 2 and 3. The clearance P <b> 1 is formed between the end portion of the inner ring bent portion 2 c of one of the race rings 2 and the inner peripheral edge portion of the other race ring 3. The clearance P <b> 2 is formed between the end of the outer ring bent portion 3 c of the other race ring 3 and the outer peripheral edge of the one race ring 2.

  As for the lubrication of the thrust roller bearing 1, the lubricating oil is supplied into the bearing as indicated by the arrow FL1 from the gap P1 on the inner diameter side, and the lubricating oil circulated inside the bearing is indicated by the arrow FL2 from the gap P2 on the outer diameter side. It is done by being discharged. In this way, the lubricating oil penetrates from the inner diameter side toward the outer diameter side.

  Thus, in the thrust roller bearing 1, the retainer 5 is formed with the notch 53a penetrating the radial direction of the outer flange 53, so that the flow path on the discharge side is expanded and the lubricating oil staying inside the bearing is discharged. Is promoted. As a result, the thrust roller bearing 1 can reduce the lubricating oil staying inside the bearing, thereby reducing the torque and increasing the amount of penetrating oil.

  In the thrust roller bearing 1, the notch 53 a is disposed radially outward in the region between the adjacent pockets 51. Thus, since the thrust roller bearing 1 has the notch 53a formed at a position different from the rotation direction of the roller 4 to which the load from the rotating roller 4 is applied and the rotation axis direction of the roller 4, The rigidity of the cage 5 can be ensured without affecting the rigidity.

Second Embodiment
In the thrust roller bearing 1 according to the first embodiment, the second embodiment is an embodiment having a configuration in which a cage 5 is formed with a through hole 53b penetrating the radial direction of the flange 53 on the outer diameter side. In the second embodiment, the description of the same configuration as that of the first embodiment is omitted for the sake of brevity.

FIG. 3 is a cross-sectional view of the thrust roller bearing 1 of the present invention. FIG. 4 is a perspective view schematically showing the cage 5 of FIG.
As shown in FIGS. 3 and 4, the thrust roller bearing 1 holds a pair of race rings 2, 31, a plurality of rollers 4 that roll between the pair of race rings 2, 31, and these rollers 4. And a cage 5 disposed between a rotating body (not shown) and a fixed housing (not shown).

  One track ring 2 is disposed on the rotating body side as an inner ring (upper side in FIG. 3), and has an inner ring raceway surface 2a, an inner ring rising portion 2b, and an inner ring bent portion 2c.

  The other race ring 31 is arranged on the fixed housing side as an outer ring (lower side in FIG. 3), and is formed by an annular member made of, for example, a thin steel plate, and an outer ring raceway surface 31a is formed on the roller 4 side end surface. . The other race ring 31 is configured not to have the outer ring rising portion 3b and the outer ring bent portion 3c with respect to the other race ring 3 of the first embodiment.

  The cage 5 is provided with a cylindrical outer flange 53 extending from the outer peripheral edge of the annular portion 52 to one side in the axial direction. The cage 5 includes an end portion on the other side in the axial direction of the outer flange 53 and an outer-diameter side overhang of the annular portion 52 that is continuous with the end portion in the radially outward direction of the region between the adjacent pockets 51. A part of the part 52a is formed with through holes 53b penetrating in the thickness direction at a plurality of locations in the circumferential direction. As for the shape of the through hole 53b, the outer flange 53 portion is rectangular, the outer diameter side overhanging portion 52a is trapezoidal, and the shorter side of the two parallel sides is on the inner diameter side, affecting the rigidity of the cage. It is formed so as not to affect.

  In the thrust roller bearing 1 configured as described above, an annular gap P1 is formed on the inner diameter side and an annular gap P2 and a gap P3 are formed on the outer diameter side between the pair of race rings 2 and 31. The clearance P <b> 1 is formed between the end of the inner ring bent portion 2 c of one of the track rings 2 and the inner peripheral edge of the other track ring 31. The gap P <b> 2 is formed between an end portion on one side of the outer flange 53 in the axial direction and the outer peripheral edge portion of the one raceway ring 2. The clearance P <b> 3 is formed between the other axial end of the outer flange 53 and the outer peripheral edge of the other race 31.

  As for the lubrication of the thrust roller bearing 1, the lubricating oil is supplied into the bearing as indicated by the arrow FL1 from the gap P1 on the inner diameter side, and the lubricating oil circulated inside the bearing is indicated by the arrows FL2, from the gaps P2, P3 on the outer diameter side, respectively. This is done by being discharged as indicated by FL3. In this way, the lubricating oil penetrates from the inner diameter side toward the outer diameter side.

  Thus, in the thrust roller bearing 1, since the through-hole 53b is formed in the retainer 5, the flow path on the discharge side is enlarged, and the discharge of the lubricating oil staying inside the bearing is promoted. As a result, the thrust roller bearing 1 can reduce the lubricating oil staying inside the bearing, thereby reducing the torque and increasing the amount of penetrating oil.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various form.
In the first embodiment and the second embodiment, the notch 53a or the through hole 53b is formed on the outer flange 53 of the cage 5 at the outer side in the radial direction in the region between the adjacent pockets 51. For example, even if it is radially outward of the pocket 51, any position that does not affect the rigidity of the cage 5 may be used.

  In the first embodiment and the second embodiment, the thrust roller bearing 1 is arranged such that the pair of race rings are interposed between the rotating body and the fixed housing. You may apply to the structure which does not have a pair of track ring but uses a rotary body and a fixed housing as a track on which the roller 4 rolls.

DESCRIPTION OF SYMBOLS 1: Thrust roller bearing, 2: One raceway ring, 2a: Inner ring raceway surface, 2b: Inner ring rise part, 2c: Inner ring bending part, 3: Other race ring, 3a: Outer ring raceway surface, 3b: Rise part, 3c : Outer ring bent part, 4: Roller, 5: Cage, 31: The other raceway, 31a: Outer ring raceway surface, 51: Pocket, 52: Ring part, 52a: Outer diameter side projecting part, 52b: Inner diameter side Overhang, 52c: Intermediate overhang, 52d, 52e, 52f: Claw, 53: Outer flange (outer diameter side flange), 53a: Notch, 53b: Through hole, 54: Inner flange

Claims (2)

A retainer having an annular portion made of an annular plate and having a plurality of pockets formed in the circumferential direction, and a pair of flanges extending axially from the outer peripheral edge and the inner peripheral edge of the annular portion;
A plurality of rollers that are locked in the respective pockets and held rotatably;
A thrust roller bearing through which lubricating oil penetrates from the inner diameter side toward the outer diameter side,
The thrust roller bearing according to claim 1, wherein a plurality of notches or through holes are formed in the retainer in the circumferential direction so as to penetrate the radial direction of the flange on the outer diameter side.   The thrust roller bearing according to claim 1, wherein the notch or the through hole is formed radially outward in a region between the adjacent pockets.

Images