JPH0716102Y2 - Thrust roller bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A thrust roller bearing (including a needle bearing) according to the present invention is mounted on a rotating portion of an automobile transmission or a car cooler compressor to support a thrust roller load. To use. In particular, the present invention makes it possible to install such a thrust roller bearing in the holding portion provided in the rotating portion only in the proper direction.

(Prior Art) Thrust roller bearings are mounted on the rotating parts of transmissions and car cooler compressors to support the thrust load applied to the rotating shaft and the like. As thrust roller bearings used in such applications, there are various types of thrust roller bearings having various structures. For example, in Japanese Examined Patent Publication No. 55-14287,
A thrust roller bearing having a structure as shown in FIG. 6 is described.

In the conventional thrust roller bearing shown in FIG. 6, a plurality of rollers 1 (only one is shown in FIG. 6) arranged in the radial direction are held by a cage 2, and the plurality of rollers 1 are circled. It is in contact with the ring-shaped race 3. Short-cylindrical partition walls 4, 5 are joined and fixed to the inner and outer peripheral edges of the race 3, respectively. Then, the other end of the partition wall 4 on the inner peripheral side is slightly bent toward the outer peripheral side so that the cage 2 and the plurality of rollers 1 held by the cage 2 can be handled integrally with the race 3. I am doing it.

Further, the outer diameter of the partition wall 5 on the outer peripheral side in the free state is set to be slightly larger than the inner diameter of the circular recess 7 provided in the casing 6. While the partition wall 5 is elastically deformed, the thrust roller bearing can be press-fitted into the recess 7 so that the bearing does not accidentally slip out of the recess 7 after the press-fitting. With the partition wall 5 pressed into the recess 7, a part of the roller 1 forming the thrust roller bearing protrudes from the recess 7 and rotatably supports a member facing the casing 6.

(Problems to be Solved by the Invention) The conventional thrust roller bearing configured as described above has the following points to be solved. That is, when the thrust roller bearing is mounted on the holding portion of the casing such as the circular recess 7, it is necessary to correctly determine the front and back direction of the bearing and mount it on this holding portion. If the mounting direction is incorrect, the rotation of the mounting portion will be poor, or the mounting portion will be significantly worn, and the life of the equipment in which the thrust roller bearing is mounted will be extremely shortened.

However, since the conventional thrust roller bearing including the structure as shown in FIG. 6 can be mounted on the holding portion of the casing from both front and back directions, the mounting direction should be carefully adjusted without any care. It was easy to reverse.

The thrust roller bearing of the present invention eliminates the above-mentioned inconvenience by physically making it impossible to mount the thrust roller bearing from the opposite direction.

(Means for Solving the Problems) The thrust roller bearing of the present invention, like the conventional thrust roller bearing described above, holds a cage that holds a plurality of rollers arranged in the radial direction, and faces the cage. And at least one race for abutting the plurality of rollers,
The holding ring is attached to the peripheral surface of the race to prevent the race and the retainer from being separated from each other, and is attached by being fitted to the holding portion of the casing.

In particular, in the thrust roller bearing of the present invention, the holding ring is made thinner than the race and rises from the peripheral surface of the cylindrical holding ring that fits with the holding portion without rattling, In order to reduce the amount of protrusion of the front side when fitted to the part, in the direction away from the peripheral surface toward the tip,
An elastic piece that is inclined in one direction is formed.

(Operation) The bearing operation of the thrust roller bearing of the present invention configured as described above is the same as that of the conventional thrust roller bearing. In particular, in the case of the thrust roller bearing of the present invention, when the casing is mounted on the holding portion, it cannot be mounted on the bearing holding portion unless the front and back directions are properly regulated and then the mounting work is performed. Eliminates the need to install the roller bearing in the opposite direction.

That is, when the thrust roller bearing is fitted in the holding portion in the correct direction, the elastic piece formed on the peripheral surface of the holding ring elastically deforms in the direction in which the amount of protrusion from the peripheral surface decreases, and Allows the holding part to fit together. After the holding ring and the holding portion are fitted, the elastic piece elastically presses the peripheral surface of the holding portion to prevent the holding ring and the holding portion from being unintentionally disengaged.

When it is attempted to fit the thrust roller bearing into the holding portion from the opposite direction, the tip edge of the elastic piece abuts against the end edge portion of the holding portion, and the holding ring and the holding portion fit together. Prevent things. Therefore, the thrust roller bearing cannot be mounted in the reverse direction.

(Embodiment) FIGS. 1 and 2 show a first embodiment of the thrust roller bearing of the present invention. This thrust roller bearing has rollers 1, 1,
It consists of a retainer 2, a race 3, and a retaining ring 10. The cage 2 among them is composed of two plate members 8 and 8 formed in a ring shape.
Are combined in a donut shape to rotatably hold a plurality of rollers 1, 1 arranged in the radial direction. Also, Race 3 above
Is the lower surface of the above-mentioned plurality of rollers 1, 1 (upper and lower depend on the drawing)
Is provided so as to abut the holder 2. Such a race 3 is made of a metal plate having a sufficient hardness in a circular ring shape, and has a short cylindrical folded wall 9 formed at the outer peripheral edge portion. The retaining ring 10 is used for this race 3
It is fixedly attached to the outer peripheral surface of the folding wall 9.

The upper edge of the retaining ring 10 is bent inward to form a bent edge 11. The inner diameter d of the bent edge 11 is smaller than the outer diameter D of the cage 2 (d <D).
However, the cage 2 is prevented from coming out from the inside of the race 3.

Casing 6 for mounting the thrust roller bearing as described above
The holding portion is a circular recess 7. Inner diameter R of this recess 7
Is slightly larger (R> r) than the outer diameter r of the retaining ring 10 excluding the elastic piece 12 described later (R> r), and the thrust roller bearing having the retaining ring 10 mounted on the outer periphery thereof is rattled in the recess 7. It is possible to fit without.

The holding ring 10 is a stainless steel plate, a synthetic resin plate, or the like.
The thin plate material having elasticity is made thinner than the race 3. At a plurality of locations on the outer peripheral surface of the retaining ring 10 (three or more locations, preferably formed at equal intervals),
An inverted U-shaped cut 13 having an opening at the top is formed. Then, a rectangular portion surrounded by the notch 13 on three sides is bent and bent outward slightly around the lower side portion.
Then, due to this bending and bending, the elastic piece 12 is inclined only in one direction so as to rise from the outer peripheral surface and move outward toward the tip located above.

The amount H of protrusion of the elastic piece 12 from the outer peripheral surface of the retaining ring 10 is based on the difference between the inner diameter R of the recess 7 and the outer diameter r of the retaining ring 10, and the outer peripheral surface of the retaining ring 10 and the inner periphery of the recess 7. The width is larger (H> (R−r) / 2) than the width of the gap formed with the surface.
Therefore, unless the elastic piece 12 is elastically deformed in the direction of decreasing the protrusion amount H, the thrust roller bearing having the retaining ring 10 mounted on the outer peripheral surface cannot be fitted into the recess 7.

The bearing action itself of the thrust roller bearing of the present invention configured as described above is similar to that of the conventional thrust roller bearing. That is, the lower surfaces of the plurality of rollers 1, 1 constituting the bearing fitted in the recess 7 of the casing 6 are brought into contact with the race 3 and the upper surface thereof is brought into contact with the lower surface of another casing which faces the upper surface of the casing 6. . Then, the casing is allowed to rotate while receiving the thrust load.

In particular, in the case of the thrust roller bearing of the present invention, when the bearing is mounted in the recess 7 which is the holding portion provided in the casing 6, the bearing is not recessed unless the front and back directions of the bearing are properly regulated before the mounting work. It is not possible to do the installation work by pushing it into 7. Therefore, the thrust roller bearing is
It will not be installed in the opposite direction.

That is, as shown in FIG. 1, when the thrust roller bearing is made to face the concave portion 7 which is the holding portion in the correct direction, and the bearing is pressed downward from this state to fit into the concave portion 7, The lower end of the elastic piece 12 formed on the outer peripheral surface of the retaining ring 10 mounted on the outer peripheral surface of the bearing enters the inside of the recess 7. If the bearing is pressed further downward from this state, this elastic piece 12
However, the retaining ring 10 is elastically deformed in a direction in which the amount H of protrusion from the outer peripheral surface of the retaining ring 10 decreases. Therefore, the elastic piece 12 in the free state
Regardless of the protrusion amount H of the bearing, the bearing having the retaining ring 10 mounted on the outer periphery can be fitted into the recess 7 which is the retaining portion.

By pressing the thrust roller bearing downward, the retaining ring 10
And the recess 7 fit together. Then, after the retaining ring 10 and the recess 7 are fitted in this way, the elastic piece 12 elastically presses the inner peripheral surface of the recess 7 so that the retaining ring 10 and the recess 7 are not fitted together. Prevent it from coming off.

If the thrust roller bearing is accidentally fitted into the recess 7 from the opposite direction, that is, the bearing is pushed upside down from the state shown in FIG. When the holding ring 10 and the inner diameter R of the recess 7
The tip edge of the elastic piece 12 protruding more than the difference from the outer diameter r of 10 abuts against the opening edge of the recess 7 and prevents further lowering of the bearing. For this reason, the retaining ring 10 on the outer peripheral surface of the bearing and the recess 7 do not fit together, and the thrust roller bearing cannot be mounted in the recess 7 in the opposite direction.

Next, FIGS. 3 to 4 show a second embodiment of the present invention.
In the case of the present embodiment, the holding portion formed in the casing 6 into which the thrust roller bearing is fitted is a short columnar convex portion 14. Further, the shapes of the race 3 and the retaining ring 10 constituting the bearing are also matched with the convex portion 14. That is, in Race 3,
Unlike the case of the first embodiment described above, the folding wall 9 is formed on the inner peripheral side. Then, the upper edge portion of the retaining ring 10 mounted on the inner circumference of the folding wall 9 is bent outward to form a bending edge 11. The outer diameter of the bent edge 11 is made larger than the inner diameter of the cage 2 to prevent the cage 2 and the race 3 from being separated.

The inner diameter of the retaining ring 10 is equal to the convex portion 14 formed on the casing 6.
The holding space 10 is slightly larger than the outer diameter of the holding part 10 so that the holding part 10 can be fitted outside without rattling. Further, an elastic piece 12 similar to that in the first embodiment is formed on the inner peripheral surface of the retaining ring 10.

In this embodiment, when the bearing is to be mounted in the casing 6, unless the bearing is oriented in the proper direction,
The retaining ring 10 cannot be fitted over the convex portion 14. Therefore, the thrust roller bearing is not assembled to the casing 6 in the opposite direction.

In the case of the above-mentioned first to second embodiments, the race 3 is the roller 1,
Although it is arranged to be provided on only one side of the race 1, races 3 and 3 may be provided on both sides of the rollers 1 and 1 as in the third embodiment shown in FIG. In this way, when the races 3 and 3 are provided on both sides of the rollers 1 and 1, the retaining rings 10 and 10 are provided on both races 3 and 3, and the retaining rings 10 and 10 are provided.
10 and 10 prevent the cage 2 from separating from the races 3 and 3. Then, at least one (both in the illustrated example) retaining ring 10 is formed with an elastic piece 12 for preventing reverse assembly.

(Effect of the Invention) Since the thrust roller bearing of the present invention is constructed and operates as described above, it is possible to reliably prevent the bearing from being installed in the casing in the reverse direction, and it is possible to prevent the bearing from being assembled in the reverse direction. It is possible to reliably prevent poor operation and deterioration of durability.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, wherein FIG. 1 is a vertical side view, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIGS. Fig. 3 shows an embodiment, Fig. 3 is a longitudinal side view, Fig. 4 is a view taken in the direction of arrow B in Fig. 3, Fig. 5 is a longitudinal side view showing a third embodiment of the present invention, and Fig. 6 is a conventional view. 3 is a partial cross-sectional view showing an example of the thrust roller bearing of FIG. 1: Roller, 2: Cage, 3: Race, 4, 5: Partition wall, 6: Casing, 7: Recessed part, 8: Plate material, 9: Folded wall, 10: Holding ring, 11:
Folded edge, 12: elastic piece, 13: cut, 14: convex part.

Claims (4)

[Scope of utility model registration request] 1. A cage for holding a plurality of rollers arranged in a radial direction, at least one race provided to face the cage and abutting the plurality of rollers, and a circumference of the race. A thrust roller bearing that is mounted on a surface and that comprises a retaining ring that prevents separation of the race and the cage, and that is mounted by fitting the retaining ring of the casing, and is made thinner than the race. On the cylindrical peripheral surface of the retaining ring that fits securely with the retaining portion, rise from this peripheral surface and head toward the tip so that the amount of protrusion of the front side portion when fitting to the retaining portion is reduced. A thrust roller bearing in which an elastic piece inclined in one direction is formed in a direction away from the peripheral surface. 2. The holding portion is a circular concave portion formed in the casing, the peripheral surface that fits into the concave portion is the outer peripheral surface of the holding ring, and the elastic piece is diametrically outward toward the tip thereof. The thrust roller bearing according to claim 1, wherein the thrust roller bearing is inclined in the direction. 3. The holding portion is a circular convex portion formed on the casing, the peripheral surface fitted with the convex portion is the inner peripheral surface of the retaining ring, and the elastic piece is radially inward toward the tip thereof. The thrust roller bearing according to claim 1, wherein the thrust roller bearing is inclined in a direction toward one side. 4. The holding portion is a circular concave portion and a convex portion formed in a pair of casings facing each other, and the peripheral surfaces fitted to the concave portion and the convex portion are the outer peripheral surface and the inner peripheral surface of the retaining ring. The thrust roller bearing according to claim 1, wherein the elastic piece is inclined diametrically inward or outwardly toward the tip.