JP2019011851A - Retainer for thrust roller bearing - Google Patents

Abstract

To provide a retainer for a thrust roller bearing which can inhibit early wear and peeling of a thrust roller bearing.SOLUTION: A retainer 4 for an annular thrust roller bearing has multiple retaining holes 4a which hold radially disposed rollers 5 in a rollable manner and has: an outer toric part 41 formed at the outer side of the multiple retaining holes 4a; an inner toric part 42 formed at the inner side of the retaining holes 4a; multiple pillar parts 43 which connect the outer toric part 41 to the inner toric part 42 in a radial direction; and multiple roller stop parts 6 which protrude from the multiple pillar parts 43 in a circumferential direction and are used to retain the rollers 5 in the retaining holes 4a. Passages 7 for allowing lubrication oil scraped by the roller stop parts 6 to pass in an axial direction are provided in at least the roller stop parts 6 disposed at the outermost side of each retaining hole 4a in the radial direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cage for a thrust roller bearing.

  The thrust roller bearing includes a plurality of cylindrical rollers arranged radially, and is inserted between a non-rotating member and a rotating member in a vehicle transmission, for example, and receives the thrust force in the direction of the rotating shaft while receiving the thrust force of the rotating member. Used for smooth rotation.

  The thrust roller bearing described in Patent Document 1 includes an annular thrust roller bearing retainer having a plurality of retaining holes that rotatably hold a plurality of radially arranged rollers, and a thrust roller bearing retainer in the axial direction. And a pair of raceway members (race) on which raceway surfaces on which a plurality of rollers roll are formed. The thrust roller bearing retainer has a plurality of roller stoppers protruding into the holding hole, and the rollers are held in the holding hole by the roller stoppers.

JP 2010-174970 A

  By the way, in the thrust roller bearing, the lubricating oil is supplied between the roller and the race to suppress the wear of the roller and the race and the separation of the race. However, depending on the state of use, the above-described roller stopper may scrape off the lubricating oil around the roller, causing wear and separation to occur early.

  Therefore, an object of the present invention is to provide a thrust roller bearing retainer capable of suppressing early wear and separation of the thrust roller bearing.

  In order to solve the above-mentioned problems, the present invention provides an annular thrust roller bearing retainer having a plurality of holding holes for rotatably holding a plurality of radially arranged rollers, the outer sides of the plurality of holding holes. An outer ring part formed on the inner ring part formed inside the holding hole, a plurality of column parts that connect the outer ring part and the inner ring part in a radial direction, and A plurality of roller stoppers protruding in a circumferential direction from a plurality of pillars and holding the rollers in the holding holes, and disposed at least radially outward in each holding hole A thrust roller bearing retainer is provided in which the stopper is provided with a flow path for allowing the lubricating oil scraped off by the roller stopper to pass in the axial direction.

  ADVANTAGE OF THE INVENTION According to this invention, the retainer for thrust roller bearings which can suppress the early wear and peeling of a thrust roller bearing can be provided.

It is a figure which shows the thrust roller bearing using the cage for thrust roller bearings which concerns on one embodiment of this invention, (a) is sectional drawing cut | disconnected by the plane containing the rotating shaft O, (b) is the one part It is an enlarged view. It is the top view seen from the inner race side of the outer race. It is the top view seen from the outer race side of the inner race. It is a figure which shows a holder | retainer, (a) is the top view seen from the inner race side, (b) is the A section enlarged view. (A) is the BB sectional drawing of FIG.4 (b), (b) is the C section enlarged view of FIG.4 (b).

[Embodiment]
An embodiment of the present invention will be described with reference to FIGS. In addition, although embodiment described below is shown as a suitable specific example in implementing this invention, although there are some parts which have illustrated various technical matters that are technically preferable. The technical scope of the present invention is not limited to this specific embodiment.

(Overall configuration of thrust roller bearing 1)
FIG. 1 is a view showing a thrust roller bearing using a thrust roller bearing retainer according to the present embodiment. FIG. 1 (a) is a cross-sectional view taken along a plane including the rotating shaft O, and FIG. FIG.

  The thrust roller bearing 1 includes a plurality of cylindrical rollers 5 arranged radially, an annular thrust roller bearing retainer (hereinafter simply referred to as a retainer) 4 that holds the plurality of rollers 5 in a rollable manner, An outer race 2 as an annular first race member which is disposed on one side in the axial direction of the cage 4 and has a first raceway surface 2a on which a plurality of rollers 5 roll, and other in the axial direction of the cage 4 And an inner race 3 as an annular second race member on which a second raceway surface 3a on which a plurality of rollers 5 roll is formed.

  The thrust roller bearing 1 is used, for example, in a transmission of a vehicle, and is inserted between a shaft-like rotating member inserted through the inner peripheral side of the inner race 3 and a support portion of the transmission housing facing the outer race 2. By rotating the plurality of rollers 5 held by the cage 4, the rotation of the rotating member is made smooth while receiving the axial thrust force.

(Description of outer race 2)
FIG. 2 is a plan view of the outer race 2 as viewed from the inner race 3 side.

  The outer race 2 is made of a metal such as a steel plate, and has an annular first raceway portion 21 formed with a first raceway surface 2a on which a plurality of rollers 5 roll, and a first raceway surface from an outer peripheral end of the first raceway portion 21. And a short cylindrical outer peripheral wall portion 22 extending orthogonally to 2a. A plurality of locking projections 23 as locking portions are provided at the end of the outer peripheral wall portion 22 on the tip side (the side opposite to the raceway surface 2a). The first track surface 2a is on a plane orthogonal to the rotation axis O, and is disposed to face a second track surface 3a of an inner race 3 to be described later.

  The plurality of locking projections 23 are provided at a plurality of locations on the outer peripheral side edge of the outer race 2, and project radially inward from the inner peripheral surface 22 a of the outer peripheral wall portion 22. The plurality of locking projections 23 lock the cage 4 and restrict the movement of the cage 4 in the direction away from the raceway surface 2a. Each locking projection 23 is formed by bending the end portion on the front end side of the outer peripheral wall portion 22 inward by, for example, staking (caulking).

  In the present embodiment, the four locking projections 23 are provided at equal intervals (every 90 °) along the circumferential direction of the outer race 2, but the number of the locking projections 23 is not limited to this. In addition, each shape and protrusion amount of the latching protrusion 23 are common. When the retainer 4 moves in a direction away from the first raceway surface 2 a with respect to the outer race 2, the outer peripheral end of the retainer 4 comes into contact with the locking projection 23, and the further axial direction of the retainer 4 with respect to the outer race 2 is increased. Movement is suppressed.

(Explanation of inner race 3)
FIG. 3 is a plan view of the inner race 3 as viewed from the outer race 2 side.

  The inner race 3 is made of a metal such as a steel plate, and has an annular second raceway portion 31 formed with a second raceway surface 3a on which the plurality of rollers 5 roll, and a second from the inner peripheral end of the second raceway portion 31. A short cylindrical inner peripheral wall portion 32 extending orthogonally to the raceway surface 3a is integrally provided. A plurality of locking projections 33 as locking portions are provided at the end of the inner peripheral wall portion 32 on the front end side (the side opposite to the raceway surface 3a). The second raceway surface 3a is arranged to face the first raceway surface 2a of the outer race 2 so as to be parallel to the first raceway surface 2a.

  The plurality of locking projections 33 are provided at a plurality of locations on the inner peripheral edge of the inner race 3, and project outward from the outer peripheral surface 32 a of the inner peripheral wall portion 32 in the radial direction. The plurality of locking projections 33 lock the retainer 4 and restrict the movement of the retainer 4 in the direction away from the raceway surface 3a. Each of the locking projections 33 is formed by bending the end portion on the front end side of the inner peripheral wall portion 32 outward by, for example, staking (caulking).

  In the present embodiment, the four locking projections 33 are provided at equal intervals (every 90 °) along the circumferential direction of the inner race 3, but the number of the locking projections 33 is not limited to this. . In addition, each shape and protrusion amount of the latching protrusion 23 are common. When the retainer 4 moves in a direction away from the second raceway surface 3 a with respect to the inner race 3, the inner peripheral end of the retainer 4 abuts on the locking projection 33, and the retainer 4 with respect to the inner race 3. Further axial movement is suppressed.

(Description of cage 4)
4A and 4B are views showing the cage 4, wherein FIG. 4A is a plan view seen from the inner race 3 side, and FIG. 4B is an enlarged view of a portion A thereof. 5A is a cross-sectional view taken along the line BB in FIG. 4B, and FIG. 5B is an enlarged view of a portion C in FIG. 4B.

  The retainer 4 includes an outer annular portion 41 formed outside the plurality of retaining holes 4a that retain the plurality of rollers 5, an inner annular portion 42 formed inside the retaining hole 4a, and an outer annular portion. 41 and a plurality of pillar portions 43 that connect the inner annular portion 42 in the radial direction are integrally provided. The outer annular portion 41 and the inner annular portion 42 are formed concentrically to form a pair, and together with the column portion 43, the holding hole 4a is formed. The holding hole 4 a is a rectangular through hole having a long side extending along the radial direction of the cage 4 and penetrating the cage 4 in the thickness direction (axial direction).

  The retainer 4 is formed with a plurality (39 in the present embodiment) of retaining holes 4a in the radial shape so as to be able to roll the plurality of rollers 5 arranged radially. Has been.

  The cage 4 protrudes from the pillar portion 43 in the circumferential direction, and has a plurality of roller stoppers 6 for holding the rollers 5 in the holding holes 4a. In FIG. 4A, the roller stopper 6 is omitted for the sake of simplicity. The roller stopper 6 is formed so as to protrude from each pillar 43 into the holding hole 4a.

  In the present embodiment, the pillar portion 43 is formed in a shape in which the central portion in the radial direction is bent into a concave shape that is recessed in the axial direction, and from the both end portions and the central portion in the radial direction, the short of the holding hole 4a. A roller stopper 6 is formed so as to protrude into the holding hole 4a along the side direction. Each holding hole 4 a is provided with a total of six roller stoppers 6, and one roller 5 is held by six roller stoppers 6.

  Hereinafter, the roller stopper 6 provided at the radially inner end of the pillar portion 43 is the inner roller stopper 6a, and the roller stopper 6 provided at the central portion in the radial direction of the pillar 43 is the central roller stopper. The roller stopper 6 provided at the radially outer end of the column part 43 is referred to as an outer roller stopper 6c. The inner roller stopper 6a and the outer roller stopper 6c are located in the vicinity of the second raceway surface 3a of the inner race 3, and restrict relative movement of the roller 5 toward the second raceway surface 3a with respect to the cage 4. To do. The center roller stopper 6b is located in the vicinity of the first raceway surface 2a of the outer race 2, and restricts relative movement of the roller 5 to the first raceway surface 2a side with respect to the cage 4.

  The roller stopper 6 is indispensable for holding the roller 5 in the cage 4, but the roller stopper 6 scrapes off the lubricating oil around the roller 5 and may cause wear. Occurs. In the thrust roller bearing 1, the rolling distance is structurally different between the inner diameter side and the outer diameter side of the roller 5, and the roller revolves while sliding while rotating, but in the radially outer portion where the slip increases. In particular, the influence of wear and the like due to lack of lubricating oil is increased. Although it is conceivable to reduce the amount of lubricating oil scraped off by the roller stopper 6 by reducing the roller stopper 6, if the roller stopper 6 is made too small, the roller 5 is inserted when the holding hole 4 a of the roller 5 is inserted. The stopper 6 is easily damaged, and the holding force of the roller 5 cannot be sufficiently obtained, so that the rollers 5 are easily tilted.

  Therefore, in the cage 4 according to the present embodiment, at least the roller stoppers 6 (here, the outer roller stoppers 6c) disposed at the outermost radial direction in each of the holding holes 4a are scraped by the roller stoppers 6. A flow path 7 for passing the taken lubricating oil in the axial direction is provided. From the viewpoint of suppressing wear and the like, it is preferable to provide the flow path 7 in all the roller stoppers 6a to 6c. In the present embodiment, the flow path 7 is provided in all the roller stoppers 6a to 6c. In addition, the flow path 7 should just be the shape which can let lubricating oil pass along an axial direction, and does not need to be formed along the axial direction. That is, the flow path 7 may be formed to be inclined with respect to the axial direction.

  The flow path 7 includes an oil groove 71 that is a groove formed on the surface of the roller stopper 6. The oil groove 71 is formed so as to extend along the short side direction of the holding hole 4 a and is formed so as to pass through a portion of the roller stopper 6 that contacts the roller 5. By forming the oil groove 71, the lubricating oil scraped off by the convex portion 72, which is the portion of the roller stopper 6 where the oil groove 71 is not formed, is shown by a broken line arrow D in FIG. The roller 5 is re-supplied between the rollers 5 and the races 2 and 3 through the oil groove 71 under the force of the rotation of the rollers 5. Moreover, by forming the oil groove 71, only the convex part 72 of the roller stopper 6 comes into contact with the roller 5, and the width of the roller stopper 6 that contacts the roller 5 can be reduced. As a result, the lubricating oil scraped off by the roller stopper 6 can be reduced. Here, although the case where the five oil grooves 71 are formed in the center roller stopper 6b is shown, the number of the oil grooves 71 is not limited to this, and may be four or less or six or more. The oil groove 71 may be formed to be slightly inclined with respect to the short side direction of the holding hole 4a.

  The flow path 7 includes an oil passage hole 73 that is a through hole penetrating the roller stopper 6 in the axial direction. The oil passage hole 73 is formed to be inclined with respect to the axial direction, and is formed to be inclined so as to be closer to the roller 5 side as it is closer to the raceway surfaces 2a and 3a. However, the direction in which the oil passage hole 73 extends is not particularly limited, and the oil passage hole 73 may be formed, for example, parallel to the axial direction. Further, when the protruding length of the roller stopper 6 is small, a part of the oil passage hole 73 may be formed so as to pass through the column part 43. Furthermore, in the present embodiment, one oil passage hole 73 is formed in each roller stopper 6, but the number of oil passage holes 73 formed in each roller stopper 6 is not limited to this, and a plurality of oil passage holes are formed. 73 may be formed.

  By forming the oil passage hole 73, the lubricating oil scraped off by the convex portion 72 between the oil grooves 71 receives the force due to the rotation of the roller 5 as shown by the broken line arrow E in FIG. The oil is supplied again between the rollers 5 and the races 2 and 3 through the oil holes 73.

  In the present embodiment, each of the roller stoppers 6a to 6c is provided with the oil groove 71 and the oil passage hole 73. However, either one of the oil groove 71 and the oil passage hole 73 is provided in each of the roller stoppers 6a to 6c. It only has to be formed. For example, both the oil groove 71 and the oil passage hole 73 may be provided in the relatively wide central roller stopper 6b, and only the oil groove 71 may be provided in the inner roller stopper 6a and the outer roller stopper 6c.

  In the present embodiment, an inner roller stopper 6a and an outer roller stopper 6c provided on the inner race 3 side, and a central roller stopper 6b provided on the outer race 2 side are arranged in the radial position (the axis of the roller 5). The roller stopper 6 is arranged asymmetrically with respect to the axial center of the cage 4. As a result, the number of roller stoppers 6 disposed at the same axial position of the rollers 5 can be reduced, and the influence of scraping of the lubricating oil by the roller stoppers 6 can be further suppressed.

  Since the cage 4 has a complicated shape in which the oil groove 71 and the oil passage hole 73 are formed in the roller stopper 6, it is desirable to use a resin made one having a high degree of freedom in shape. As the resin used for the cage 4, it is desirable to use a resin having self-lubricating properties. An example of a resin suitable for the cage 4 is 6,6-nylon. The oil passage hole 73 may be formed by drilling with a drill or the like after resin molding.

(Operation and effect of the embodiment)
According to the embodiment described above, the flow path 7 is provided in the roller stopper 6, so that the lubricating oil scraped off by the roller stopper 6 can be re-supplied to the roller 5 through the channel 7. . As a result, metal contact between the roller 5 and the races 2 and 3 due to lack of lubricating oil (running out of the oil film) is suppressed, and the thrust roller bearing 1 is prevented from premature wear and delamination, and a long-life thrust roller bearing. 1 can be realized.

  As mentioned above, although this invention was demonstrated based on embodiment, these embodiment does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Thrust roller bearing 4 ... Cage (Thrust roller bearing cage)
4a ... Holding hole 41 ... Outer ring portion 42 ... Inner ring portion 43 ... Column portion 5 ... Roller 6 ... Roller stopper 7 ... Channel 71 ... Oil groove (groove)
73. Oil passage hole (through hole)

Claims (3)

An annular thrust roller bearing retainer having a plurality of holding holes that hold a plurality of radially arranged rollers in a rollable manner,
An outer annular portion formed outside the plurality of holding holes;
An inner ring formed inside the holding hole;
A plurality of pillars connecting the outer ring part and the inner ring part in a radial direction;
A plurality of roller stoppers protruding in the circumferential direction from the plurality of pillars, and holding the rollers in the holding holes;
The roller stopper disposed at least radially outward in each holding hole is provided with a flow path for passing the lubricating oil scraped off by the roller stopper in the axial direction.
Thrust roller bearing cage. The flow path includes a groove formed in the surface of the roller stopper.
The cage for a thrust roller bearing according to claim 1. The flow path includes a through hole penetrating the roller stopper in the axial direction.
The thrust roller bearing retainer according to claim 1 or 2.

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