JPH08109925A - Thrust roller bearing - Google Patents

Abstract

PURPOSE: To provide a structure of a thrust roller bearing capable of being assembled only in the normal manner to a retaining part of a casing, and to enable the assembly to the retaining part with large dimension in the axial direction. CONSTITUTION: In the assembly, a folded vertical wall 6b formed on the outer circumferential edge of a lace 4b is internally fitted in a retaining part which is a circular recessed part. A plurality of extending pieces 17 are extended from the edge of this folded vertical wall 6b, and a projecting part 18 projected outward in the radial direction is formed on the tip part of each extending piece 17. Even if the projecting part is assembled in the opposite direction, this projecting part 18 is interfered with the circumferential edge part of the retaining part to make the assembly impossible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A thrust roller bearing (including a needle bearing) according to the present invention is mounted on a rotating portion of a transmission for a vehicle or a compressor for a car cooler and used to support a thrust load.

[0002]

2. Description of the Related Art Thrust roller bearings are attached to the rotating parts of transmissions and car cooler compressors.
It is designed to support the thrust load applied to the rotating shaft, etc. FIG. 9 shows an example of a thrust roller bearing used for such a rotating portion. This thrust roller bearing 1
Is a plurality of rollers 2 arranged in the radial direction and the rollers 2
A pair of races 4a for sandwiching the cage 3 for holding the upper and lower rollers 2 and the plurality of rollers 2 from above and below (the upper and lower sides are according to the drawings and does not represent the upper and lower positions in use. The same applies throughout the present specification). And 4b. The cage 3 is formed by combining metal plates, each of which has a U-shaped cross-section and is formed into a circular ring shape, in the middle, and has the same number of pockets 5 as the rollers 2.

Further, each of the races 4a and 4b is made of a metal plate having a sufficient hardness in the shape of a circular ring. A short cylindrical folded wall is formed on each of the inner peripheral edge of one race 4a (upper side in FIG. 9) generally called an inner ring and the outer peripheral edge of the other race (lower side in FIG. 9) generally called an outer ring. 6a and 6b are formed. And
Of these, the front end portions of the folding wall 6a are bent outward in the diametrical direction, and the front end portions of the folding wall 6b are bent inward in the diametrical direction to form locking portions 7a and 7b. The engaging portions 7a and 7b and the inner peripheral edge or the outer peripheral edge of the cage 3 are engaged with each other, and the constituent parts of the thrust roller bearing 1 are coupled to each other in a non-separable manner.

Thrust roller bearing 1 constructed as described above
For example, as shown in FIG. 9, when the folding wall 6b formed on the outer peripheral edge of the race 4b called the outer ring is fitted in the holding portion 9 which is a circular recess formed in the casing 8, the thrust load is Attach to the rotating part that occurs. In this state, the lower surface of the race 4b is the inner surface 9a of the holding portion 9.
And the upper surface of the other race 4a comes into contact with the end surface 10a of the mating member 10. As a result, the mating member 10 is rotatably supported by the casing 8 and the thrust load acting between the two members 10 and 8 is supported. During the operation of such a rotation support device, lubricating oil is circulated in the rollers 2 rolling portions inside the thrust roller bearing 1. This lubricating oil is applied to the outer peripheral edge of the race 4a and the folding wall 6
It flows in the diametrical direction of the thrust roller bearing 1 while passing through a gap 11a between the tip end edge of b and a gap 11b between the inner peripheral edge of the race 4b and the tip edge of the folded wall 6a.

Such a thrust roller bearing 1 causes no particular problem if it is assembled in the normal direction as shown in FIG. 9, but when it is assembled in the opposite direction as shown in FIG. It becomes impossible to feed a sufficient amount of lubricating oil into the bearing 1. In addition, the race 4b and the casing 8 or the mating member 1
0, slip, abrasion, seizure, etc. occur. In order to eliminate such inconvenience, various structures have been conventionally proposed for preventing the thrust roller bearing from being assembled in the holding portion of the casing in the reverse direction, and some of them have been actually used.

First, FIGS. 11 to 12 show a structure described in Japanese Utility Model Laid-Open No. 1-67328 as a first example of a conventionally known structure for preventing misassembly of a thrust roller bearing. In the case of the structure of the first example, the outer diameter L ₁ of the folding wall 6b formed on the outer peripheral edge portion of the race 4b is slightly smaller than the outer diameter L ₁ of the race 4a as compared with the diameter L ₀ of the holding portion 9. L ₂ is made sufficiently large (L ₁ <L ₀ <L ₂ ).
Therefore, as shown in FIG. 11, when the thrust roller bearing 1a is in the proper orientation, the folded wall 6b is attached to the holding portion 9a.
Can be fitted to the thrust roller bearing 1 as shown in FIG.
When the direction of a is incorrect, the folded wall 6b cannot be fitted to the holding portion 9. As a result, the thrust roller bearing 1a is not assembled in the holding portion 9 in the wrong direction.

Next, FIGS. 13 to 17 show a second to a fourth example of a conventionally known erroneous assembly preventing structure, which is an actual flat plate 1-8.
The structure described in Japanese Patent No. 7332 is shown. First,
In the case of the structure of the second example shown in FIGS. 13 to 14, the folding wall 6 formed on the outer peripheral edge portion of the race 4b called the outer ring.
The holding ring 12 is attached to the outer peripheral surface of b in a fixed manner. The upper edge of the retaining ring 12 is bent inward in the diametrical direction to form a bending edge 13, and the inner diameter d of the bending edge 13 is made smaller than the outer diameter D of the cage 3 (d <D), so that the roller 2 Two
The retainer 3 holding the above is prevented from coming out from the inside of the race 4b.

The inner diameter R of the holding portion 9 of the casing 8 constituting the thrust roller bearing 1b as described above is slightly larger than the outer diameter r of the holding ring 12 excluding the elastic piece 14 (R> r). are doing. Therefore, the thrust roller bearing 1b having the holding ring 12 mounted on the outer periphery thereof can be fitted into the holding portion 9 without rattling. The retaining ring 12 made thinner than the race 4b by the elastic thin plate material.
An inverted U-shaped cut 15 having an opening at the top is formed at a plurality of positions on the outer peripheral surface of the. Then, the rectangular portion surrounded on three sides by the cut 15 is bent and bent slightly outward in the diametrical direction with the lower side portion as the center, so that it is inclined only in one direction so as to be directed outward in the diametrical direction as it goes upward. The elastic piece 14 is used. The tip of this elastic piece 14 is the holding ring 1.
2 is the inner diameter R of the holding portion 9
Is larger than the width of the gap formed between the outer peripheral surface of the retaining ring 12 and the inner peripheral surface of the retaining portion 9 based on the difference between the outer diameter r of the retaining ring 12 and (H> (R−r) / 2) Yes. Therefore,
Unless the elastic piece 14 is elastically deformed in the direction of reducing the protrusion amount H, the thrust roller bearing having the holding ring 12 mounted on the outer peripheral surface cannot be fitted into the holding portion 9.

In the case of the thrust roller bearing 1b of the second example configured as described above, when the thrust roller bearing 1b is mounted on the holding portion 9 provided on the casing 8, the thrust roller bearing 1b is properly regulated in the front and back directions before the mounting work. Unless this is done, the thrust roller bearing 1b cannot be pushed into the holding portion 9 for mounting work. That is, as shown in FIG. 13, when the mounting operation is performed with the thrust roller bearing 1b facing the holding portion 9 in the correct direction, the elastic piece 14 formed on the outer peripheral surface of the holding ring 12 is elastically deformed. While entering the inside of the holding portion 9. Therefore, regardless of the protruding amount H of the elastic piece 14 in the free state,
The bearing having the retaining ring 12 mounted on the outer periphery can be fitted to the retaining portion 9. On the other hand, when the thrust roller bearing 1b is to be fitted into the holding portion 9 from the opposite direction, the tip end edge of the elastic piece 14 protruding from the outer peripheral surface of the holding ring 12 is the holding portion 9 of the holding portion 9. It abuts the opening edge and prevents further lowering of the bearing. Therefore, the retaining ring 12 on the outer peripheral surface of the bearing is
And the holding portion 9 are not fitted to each other, and the thrust roller bearing 1b cannot be mounted in the opposite direction to the holding portion 9.

Next, in the case of the third example shown in FIGS. 15 to 16, a short cylindrical projection is formed on a part of the casing 8a,
This convex portion serves as a holding portion 16 for fitting the thrust roller bearing 1c. And race 4 called the inner ring
A holding ring 12a is attached to the inner peripheral surface of the folded wall 6a formed on the inner peripheral edge of a, and the upper edge portion of the holding ring 12a is bent outward in the diametrical direction to form a bending edge 13a. The outer diameter of the bent edge 13a is larger than the inner diameter of the cage 3 to prevent the cage 3 and the race 4a from being separated from each other.
The inner diameter of the holding ring 12a is slightly larger than the outer diameter of the holding portion 16. Further, on the inner peripheral surface of the holding ring 12a, an elastic piece 14a is formed which is inclined inward in the diametrical direction toward the tip edge. Third like this
In the case of the structure of the example, the holding ring 12a cannot be fitted onto the holding portion 16 unless the thrust roller bearing 1c faces the proper direction. Therefore, the thrust roller bearing 1
There is no case where c is attached to the casing 8 in the opposite direction.

Further, in the case of the fourth example shown in FIG. 17, races 4a and 4b are provided on both sides of the rollers 2 and 2 to form a thrust roller bearing 1d. When the races 4a and 4b are provided on both sides of the rollers 2 and 2 in this way, both races 4a and
4b is provided with retaining rings 12 and 12a, and both retaining rings 1
2, 12a prevent the cage 3 from being separated from the races 4a, 4b. Further, at least one (both in the illustrated example) retaining rings 12, 12a are formed with elastic pieces 14, 14a for preventing reverse assembly.

[0012]

However, the conventional thrust roller bearing constructed as described above has the following disadvantages. First, in the case of the first example shown in FIGS. 11 to 12, the mounting portion is limited, and depending on the depth of the holding portion 9, the mounting may not be possible unless another component such as a spacer is used. That is, if the holding portion 9 is deep as shown in FIG. 18, before the race 4b abuts on the inner surface 9a of the holding portion 9, the outer peripheral portion of another race 4a contacts the peripheral portion of the holding portion 9. I will touch you. As a result, a gap is formed between the race 4b and the inner surface 9a, so that the thrust roller bearing 1a cannot support the rotation.

Further, in the cases of the second to fourth examples shown in FIGS. 13 to 17, there is a problem that the manufacturing cost increases due to an increase in the number of parts in addition to the above-mentioned inconvenience. That is, in the case of the structures of the second to fourth examples, the retaining ring 12,
12a is required, and the manufacturing cost increases accordingly.

The thrust roller bearing of the present invention has been invented to eliminate any of the above inconveniences.

[0015]

The thrust roller bearing of the present invention, like the conventional thrust roller bearing described above, retains a plurality of rollers arranged in the radial direction, and a retainer opposed to the retainer. And at least one race for abutting the plurality of rollers, and a cylindrical folding wall formed on the peripheral surface of the race. Then, the separation between the race and the retainer is prevented based on the engagement between the edge portion of the folding wall and the peripheral portion of the retainer, and the folding wall is fitted into the retaining portion of the casing. It is attached to this casing.

Particularly, in the thrust roller bearing of the present invention, an extending piece extending in the axial direction from the edge portion of the folded wall and a protruding portion formed at the tip of the extending piece. Is equipped with. The projecting portion is bent from the tip end portion of the extending piece in the diametrical direction on the one hand in a direction that interferes with the holding portion.

[0017]

The bearing action of the thrust roller bearing of the present invention constructed as described above is the same as that of the conventional thrust roller bearing. Also, in the case of the thrust roller bearing of the present invention, as in the case of the conventional structure described above, when the casing is mounted on the holding portion, the thrust roller bearing is mounted unless the front and back directions are properly regulated before the mounting work. It cannot be attached to the holding part. As a result, it is not necessary to mount the thrust roller bearing in the opposite direction. That is, when the thrust roller bearing is fitted in the holding portion in the correct direction, the protruding portion at the tip end of the extension piece does not interfere with the peripheral portion of the holding portion, and the folding wall and the holding portion are separated from each other. Allows mating with each other. When the thrust roller bearing is fitted to the holding portion from the opposite direction, the protruding portion interferes with the peripheral portion of the holding portion and prevents the folded wall and the holding portion from fitting each other. . Therefore, the thrust roller bearing cannot be mounted in the opposite direction.

In particular, in the case of the thrust roller bearing of the present invention, the race can be brought into contact with the mating surface regardless of the dimension of the holding portion in the axial direction. Therefore, it becomes possible to mount the same type of thrust rolling bearing on the holding portions having different sizes. Further, in order to prevent incorrect assembly, no parts other than those originally required for the thrust rolling bearing are used, so that the manufacturing cost is not increased by increasing the number of parts.

[0019]

1 to 4 show a first embodiment of the present invention. The thrust roller bearing 1A of the present invention is characterized by the structure of the portion that can be assembled to the holding portion of the casing only in the proper direction. Since the structure and operation of the other parts are the same as those of the conventional thrust roller bearing 1 shown in FIG. 9, the same parts are designated by the same reference numerals, and the overlapping description will be omitted. The part will be mainly described.

At a plurality of edge portions (four locations in the illustrated example) of the folded wall 6b formed on the outer peripheral edge portion of the race 4b, which is called an outer ring, from this edge portion, the axial direction (vertical direction in FIG. 1, The extending pieces 17, 17 extending in the front and back direction of FIG. 2) are formed. Then, projecting portions 18, 18 are formed at the tip portions of the respective extension pieces 17, 17. These protrusions 18, 18 are respectively the extension pieces 17,
The outer peripheral surface of the distal end portion of the protrusion 17 projects diametrically outward. That is, each of these protrusions 18, 18 has the above-mentioned extension piece 17,
It is formed by plastically deforming the widthwise central portion of the tip end portion of 17 in the diametrically outward direction.
It is bent in a direction in which it interferes with the peripheral edge portion of the opening of the holding portion 9 of the casing 8 from the tip portion of 7. Locking portions 7b and 7b for preventing the race 4b and the cage 3 from being separated from each other are formed in the intermediate portions of the respective extending pieces 17 and 17. The angle at which the protrusions 18, 18 are bent (plastically deformed) with respect to the extension pieces 17, 17 is less than 90 degrees. Therefore, the protrusions 18, 18 and the extension pieces 17, 17 are
The intersection angle between the outer peripheral side surfaces of and is an obtuse angle.

The tips of the extension pieces 17, 17 are
As shown in the figure, it may project above the upper surface of the race 4a called the inner ring. However, if it does not project, the thrust roller bearing 1A that can be used regardless of the shape of the mating member 10 (FIGS. 9 to 10) can be configured, and versatility can be enhanced. That is, the mounting surface of the mating member 10 is
As long as only the portion of the race 4a facing the upper surface of the race 4a is projected downward, it does not matter even if the tip of each of the extending pieces 17 and 17 projects from the upper surface of the race 4a. On the other hand, when the mounting surface is a single plane that extends from the upper surface of the race 4a to the portion facing the tip of each of the extending pieces 17, 17, the extending pieces 17, 17 are It is necessary to prevent the tip of the above from protruding beyond the upper surface of the race 4a. Therefore, the mating member 1
In order to enable the thrust roller bearing 1A to be used regardless of the shape of the mounting surface of No. 0, it is preferable that the tip end portions of the respective extending pieces 17, 17 do not project beyond the upper surface of the race 4a.

In the case of the thrust roller bearing 1A of the present invention constructed as described above, when the casing 8 is mounted on the holding portion 9, the mounting work is performed unless the front and back directions are properly regulated before the mounting work. I can't do it. That is, as shown in FIG. 4 (A), when the thrust roller bearing 1A is fitted to the holding portion 9 in the correct direction, the protrusion 18 formed at the tip of each extension piece 17 is It does not interfere with the peripheral portion of the opening of the holding portion 9. Therefore, the folded wall 6b of the race 4b can be fitted into the holding portion 9 internally, and the thrust roller bearing 1A can be assembled to the rotation support portion. On the other hand, as shown in FIG. 4 (B), when the thrust roller bearing 1A is to be fitted to the holding portion 9 from the opposite direction, each of the protrusions 18 causes the holding edge of the holding portion 9 to open. The folded wall 6b is prevented from fitting in the holding portion 9 by abutting against the portion. Therefore, the thrust roller bearing 1A cannot be mounted in the reverse direction.

Particularly, in the case of the thrust roller bearing 1A of the present invention, each of the above-mentioned extension is irrespective of the dimension of the holding portion 9 in the axial direction (in the present embodiment, the depth of the holding portion 9). Piece 1
The race 4b having the protrusions 7 and 17 and the protrusions 18 and 18 can be brought into contact with the inner surface 9a of the holding portion 9, which is the mating surface. That is, when the holding part 9 is deeper in the state of FIG.
The extension pieces 17 are elastically deformed inward in the diametrical direction by being pushed by the opening edge of the. Therefore, each of the protrusions 1
Regardless of the existence of the holes 8 and 18, the thrust bearing 1A can be pushed into the holding portion 9 and the race 4b and the inner surface 9a can be brought into contact with each other. Therefore, it is possible to assemble the same type of thrust rolling bearing 1A to the holding portions 9 having different depth dimensions. Also, to prevent incorrect assembly,
Since no components other than those originally required for the thrust rolling bearing 1A such as the retaining rings 12 and 12a (FIGS. 13, 15 and 17) are used, the manufacturing cost is not increased by increasing the number of components.

The extension piece 17 shown in FIG. 3 has a shape in which the edge of the folding wall 6b and the strip portion are continuous with a quarter arc portion as shown in FIG. 5 (A). However, it is also possible to adopt a shape in which the quarter arc portion as shown in FIG. 7B is omitted, or a shape of Mt. Fuji as shown in FIG. Also, regarding the shape of the protruding portion 18 formed at the tip end portion of each extension piece 17, instead of plastically deforming only the widthwise intermediate portion of each extension piece 17, as shown in FIG. Each extension piece 1
It is also possible to plastically deform the entire tip portion of 7 to form the protruding portion 18a.

Next, FIGS. 7 to 8 show a second embodiment of the present invention. The thrust roller bearing 1B according to the present embodiment has a short columnar holding portion 16 (see FIGS. 15 and 1) formed in the casing 8a.
It has a structure to be attached to 7). For this reason, in the case of the present embodiment, the extending pieces 17, 17 are formed on the edge of the folding wall 6a formed on the inner peripheral edge of the race 4a called the inner ring, and the extending pieces 17, 17 are formed. Protruding portions 18b, 18b each bent inward in the diametrical direction are formed at the tip portion.

In the case of the present embodiment, when the thrust roller bearing 1B is fitted in the holding portion 16 in the correct direction, the protruding portion 18b formed at the tip end portion of each of the extending pieces 17 has the holding portion 16 described above. Does not interfere with the outer peripheral part of the tip surface. Therefore, the folded wall 6a of the race 4a can be fitted onto the holding portion 16, and the thrust roller bearing 1B can be assembled to the rotation support portion. On the other hand, when the thrust roller bearing 1B is to be fitted to the holding portion 16 from the opposite direction, the respective protruding portions 18b abut against the portion of the holding portion 16 near the outer periphery of the front end surface, and the folding It prevents the holding portion 16 from fitting the standing wall 6a onto the outer wall 9. Therefore, the thrust roller bearing 1B cannot be mounted in the reverse direction.

In the case of this embodiment, even if the height of the holding portion 16 is large, the extending pieces 17, 17 are elastically deformed outward in the diametrical direction, so that the race 4a and the casing 8a are brought into contact with each other. It is possible to make contact. The points to be considered regarding the relationship between the tip edge position of the protruding portion 18b and the upper surface position of the race 4b are the same as in the case of the first embodiment described above.

[0028]

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 assembled in the reverse direction with respect to the casing, and the operation associated with the assembly in the reverse direction can be prevented. It is possible to reliably prevent defects and deterioration in durability. Further, the race can be brought into contact with the mating surface regardless of the dimension of the holding portion in the axial direction, and the same type of thrust rolling bearing can be assembled to the holding portions having different dimensions. Moreover, in order to prevent erroneous assembly, parts other than those originally required for the thrust rolling bearing are not used, so that the manufacturing cost is not increased by increasing the number of parts. Therefore, by improving versatility and reducing the number of parts,
Costs can be reduced in terms of production costs, parts management, and product management.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view of a race used in the first embodiment.

FIG. 3 is a partial perspective view of the same race.

4A and 4B are partial cross-sectional views showing a mounting state of a casing to a holding portion, in which FIG. 4A is a state in which the casing is mounted in a normal direction, and FIG.

FIG. 5 shows three examples of the shape of the extending piece, and A of FIG. 3 respectively.
View from the arrow.

FIG. 6 is a view similar to FIG. 3, showing another example of the shape of the protruding portion.

FIG. 7 is a partial sectional view showing a second embodiment of the present invention.

FIG. 8 is a plan view of a race used in the second embodiment.

FIG. 9 is a partial cross-sectional view showing a state in which a conventionally known thrust roller bearing is assembled to a casing in a regular direction.

FIG. 10 is a partial cross-sectional view showing a state where the same is assembled in the opposite direction.

FIG. 11 is a cross-sectional view showing a first example of a conventional structure in consideration of prevention of erroneous assembly in a state where assembly is attempted from the normal direction.

FIG. 12 is a cross-sectional view showing a state in which the same is being assembled from the opposite direction.

FIG. 13 is a cross-sectional view showing a second example of a conventional structure in consideration of prevention of incorrect assembly in a state where assembly is attempted from the normal direction.

FIG. 14 is a view on arrow B of FIG.

FIG. 15 is a cross-sectional view showing a third example of a conventional structure in consideration of prevention of incorrect assembly in a state where assembly is being performed from the normal direction.

16 is a view on arrow C of FIG.

FIG. 17 is a cross-sectional view showing a fourth example of a conventional structure in consideration of prevention of incorrect assembly in a state where assembly is attempted from the normal direction.

FIG. 18 is a partial cross-sectional view showing a state where the thrust roller bearing having the structure of the first example is about to be mounted on a holding portion having a large depth dimension.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d, 1A, 1B Thrust roller bearing 2 Roller 3 Cage 4a, 4b Race 5 Pocket 6a, 6b Folding wall 7a, 7b Engagement part 8, 8a Casing 9 Holding part 9a Inner surface 10 Mating member 10a End surface 11a, 11b Gap 12, 12a Cage 13, 13a Bending edge 14, 14a Elastic piece 15 Cut 16 Holding part 17 Extension piece 18, 18a, 18b Projection part

Claims (1)

[Claims] 1. A retainer for holding a plurality of rollers arranged in a radial direction, at least one race provided to face the retainer and abutting the plurality of rollers, and a peripheral edge of the race. A folding wall having a cylindrical shape formed in the portion, and preventing separation of the race and the retainer based on engagement between an edge portion of the folding wall and a peripheral portion of the retainer, In a thrust roller bearing mounted on the casing by fitting the standing wall to the holding portion of the casing, an extension piece extending axially from the edge of the folding wall,
A protrusion formed on the tip of the extension piece, wherein the protrusion is bent from the tip of the extension piece in a direction that interferes with the holding portion on the one side in the diametrical direction. Thrust roller bearings.