JP4548354B2 - Thrust roller bearing - Google Patents

Description

  A thrust roller bearing (including a thrust needle bearing) according to the present invention is used in a state where it is assembled to a rotating portion in order to support a thrust load applied to the rotating portion of various mechanical devices such as an automobile transmission.

  A thrust roller bearing is mounted on a rotating part of a transmission or the like so as to support a thrust load applied to a rotating shaft or the like. FIG. 9 shows one described in Patent Document 1 as an example of a thrust roller bearing used for such a rotating portion. The thrust roller bearing 1 includes a plurality of rollers 2 (including needles) arranged in a radial direction, a cage 3 that holds the rollers 2, and a pair of races 4a that clamp the rollers 2 from both sides. 4b. The cage 3 is formed by combining the first and second cage elements 5 and 6, each of which is U-shaped in cross section and formed in an annular shape, in the middle, and has the same number of pockets 7 as the rollers 2. Are arranged radially.

  The first cage element 5 is made by subjecting a metal plate such as a steel plate to plastic working such as press working, and the first inner diameter side cylindrical portion 9 is formed on both inner and outer peripheral edges of the first annular portion 8. And the first outer diameter side cylindrical portion 10 are formed concentrically with each other. And the rectangular 1st through-hole 11 with which each is long in the radial direction for comprising each said pocket 7 in the circumferential direction several places of the 1st ring part 8 among these is provided. The second cage element 6 is also made by subjecting a metal plate such as a steel plate to plastic working such as press working. The cylindrical portion 13 and the second outer diameter side cylindrical portion 14 are formed concentrically with each other. And the rectangular 2nd through-hole 15 with which each is long in the radial direction for comprising each said pocket 7 in the circumferential direction several places of the 2nd ring part 12 among these is provided. The first and second retainer elements 5 and 6 each having such a configuration are arranged in a state where the first through holes 11 and the second through holes 15 are aligned with each other in the axial direction. The second outer diameter side cylindrical portion 14 is fitted on the inner diameter side of the first outer diameter side cylindrical portion 10, and the second inner diameter side cylindrical portion 13 is positioned on the outer diameter side of the first inner diameter side cylindrical portion 9. Are combined with the external fitting. And separation | separation is prevented by bending the front-end edge of this 1st internal diameter side cylindrical part 9 to radial direction outward. In addition to the illustrated example, the shape of the cage may be formed by bending a single metal plate, for example.

  Each of the races 4a and 4b is formed in an annular shape from a metal plate having sufficient hardness. An inner peripheral edge of a circular ring portion 16a constituting one race (a left side in FIG. 9) generally called an inner ring and a circle constituting a race 4b on the other side (a right side in FIG. 9) generally called an outer ring. A short cylindrical inner diameter side folded wall 17 and an outer diameter side folded wall 18 are formed on the outer peripheral edge of the ring portion 16b by bending in the axial direction. Of these, the inner diameter side engaging portions 19 formed so as to protrude radially outward are provided at a plurality of positions in the circumferential direction of the tip end portion of the inner diameter side folded wall 17. Outer-diameter side locking portions 20 formed so as to protrude radially inward are provided at a plurality of locations in the circumferential direction of the tip portion. The engaging portions 19 and 20 and the inner or outer peripheral edge of the retainer 3 are engaged with each other, so that the components of the thrust roller bearing 1 are connected to each other without separation. The one side surface (right surface in FIG. 9) and the other side surface (left surface in FIG. 9) of the circular ring portion 16a facing each other are race surfaces that are in rolling contact with the respective rollers 2. .

  The thrust roller bearing 1 configured as described above includes, for example, a circular recess formed in a casing 21 with an outer diameter side folded wall 18 formed on the outer peripheral edge of a race 4b called the outer ring as shown in FIG. In a state of being fitted into a certain holding portion 22, it is attached to a rotating portion where a thrust load is generated. In this state, the right surface of the race 4b contacts the back surface 23 of the holding portion 22, and the left surface of the other race 4a contacts the end surface 25 of the mating member 24. As a result, the mating member 24 is rotatably supported with respect to the casing 21 and a thrust load acting between the members 24 and 21 is supported. The back surface 23 or the end surface 25 may be a race surface, and one of the races 4a and 4b may be omitted.

  As described above, the thrust roller bearing 1 engages the inner diameter side locking portion 19 or the outer diameter side locking portion 20 of the race 4a or the race 4b with the inner peripheral edge or the outer peripheral edge of the cage 3. Thus, the retainer 3 and the races 4a and 4b are connected to each other without separation. In this way, the inner diameter side locking portion formed at the tip of the inner diameter side folded wall 17 or the outer diameter side folded wall 18 in order to connect the retainer 3 and the races 4a, 4b without separation. Conventionally, as described in Patent Documents 2 and 3, for example, the number of the 19 or outer diameter side locking portions 20 is usually formed in about 3 to 4 locations in the circumferential direction. 10 and 11 show a structure in which three inner diameter side locking portions are formed in the circumferential direction.

  Of these, FIG. 10 shows a structure in which inner diameter side locking portions 19 a and 19 a each having a predetermined width dimension b in the circumferential direction are formed at the distal end portion of the inner diameter side folded wall 17. In the structure shown in FIG. 10, a protruding portion provided in advance to protrude from the other portion in the portion that becomes the tip portion of the inner diameter side folding wall 17 is bent outward in the radial direction. Stop portions 19a and 19a are formed. On the other hand, FIG. 11 shows a structure in which inner diameter side locking portions 19 b and 19 b each having a small circumferential width are formed at the distal end portion of the inner diameter side folded wall 17. In the structure shown in FIG. 11, the inner diameter side locking portions 19b and 19b are formed by projecting the three tip end portions of the inner diameter side folded wall 17 outward in the radial direction.

  When the inner diameter d of the race 4a forming the inner diameter side folded wall 17 is 20 mm or less, as described above, if there are three or more inner diameter side locking portions 19a, 19b in the circumferential direction, the race 4a It becomes difficult to incorporate the cage 3 and each roller 2 (see FIG. 9). That is, when there are three or more inner diameter side locking portions 19a and 19b, the inner diameter d of the race 4a is small, so the interval between the inner diameter side locking portions 19a and 19a adjacent in the circumferential direction is narrow. It is difficult for the cage 3 and the rollers 2 to get over the inner diameter side locking portions 19a and 19b. On the other hand, it is possible to incorporate the cage 3 and the rollers 2 into the race 4a by elastically deforming the inner diameter side folding wall 17 forming the inner diameter side locking portions 19a and 19b. Since the inner diameter of the race 4a is as small as 20 mm or less, the inner diameter side folded wall 17 has high rigidity, and the inner diameter side folded wall 17 is hardly elastically deformed. For this reason, it is difficult to perform the work of incorporating the cage 3 and the rollers 2 into the race 4a while elastically deforming the race 4a.

  On the other hand, FIGS. 12 and 13 respectively show structures in which three outer diameter side locking portions 20a and 20b are formed in the circumferential direction at the tip of the outer diameter side folded wall 18 of the race 4b. Of these, FIG. 12 shows a structure in which outer diameter side locking portions 20 a and 20 a each having a predetermined width dimension B in the circumferential direction are formed at the distal end portion of the outer diameter side folded wall 18. In the structure shown in FIG. 12, the outer diameter-side folded wall 18 is provided with a protruding portion that is provided in advance in a portion that protrudes from the other portion inward in the radial direction. Side locking portions 20a, 20a are formed. On the other hand, FIG. 13 shows a structure in which outer diameter side locking portions 20 b and 20 b each having a small width in the circumferential direction are formed at the distal end portion of the outer diameter side folded wall 18. In the structure of FIG. 13, the outer diameter side engaging portions 20b and 20b are formed by projecting the three tip end portions of the outer diameter side folded wall 18 radially inward.

  As described above, even when three or more outer diameter side locking portions 20a and 20b are formed on the outer diameter side folded wall 18, when the outer diameter D of the race 4b is 40 mm or less, the cage is still used. 3 and each roller 2 (see FIG. 9) are difficult to be incorporated into the race 4b. That is, as in the case of the inner diameter side locking portions 19a and 19b described above, when there are three or more outer diameter side locking portions 20a and 20b, each outer diameter side locking portion 20a adjacent in the circumferential direction, Since the interval of 20b becomes narrow, it is difficult for the cage 3 and the rollers 2 to get over the outer diameter side locking portions 20a and 20b. It is also possible to incorporate the cage 3 and the rollers 2 into the race 4b by elastically deforming the outer diameter side folded wall 18, but the outer diameter of the race 4b is as small as 40 mm or less. The rigidity of the folding wall 18 is high, and the outer diameter side folding wall 18 is not easily elastically deformed. Therefore, it becomes difficult to incorporate the cage 3 and the rollers 2 into the race 4b.

  On the other hand, when the inner diameter d of the race 4a exceeds 20 mm, or when the outer diameter D of the race 4b exceeds 40 mm, the inner diameter side locking portion or the outer diameter side locking portion adjacent in the circumferential direction. , And the races 4a and 4b are relatively easily elastically deformed, so that the cage 3 and the rollers 2 (see FIG. 9) can be easily assembled. However, as in the structure shown in FIGS. 10 and 12 described above, the inner diameter side locking portion or the outer diameter side locking portion is connected in advance to the distal end portion of the inner diameter side folding wall 17 or the outer diameter side folding wall 18. In the case of forming by bending the protruding portion provided in the portion, the shape of the inner peripheral edge or the outer peripheral edge of the races 4a and 4b may be distorted in the circumferential direction.

  That is, when the respective width dimensions in the circumferential direction of the inner diameter side locking portion or the outer diameter side locking portion exceed 15 mm, the inner diameter side folded wall 17 or the outer diameter side folded wall 18, The difference in rigidity between the portion where the locking portions 19a and 20a are formed and the portion which is separated from the locking portions 19a and 20a in the circumferential direction becomes large. In particular, when the inner diameter d of the race 4a exceeds 20 mm, or when the outer diameter D of the race 4b exceeds 40 mm, the portions where the locking portions 19a and 20a are formed and the locking portions 19a. , 20a, the difference in rigidity becomes remarkable between the portions deviated in the circumferential direction. Accordingly, when the folded walls 17 and 18 are formed by being bent, a portion where the locking portions 19a and 20a are formed, and a portion between the locking portions 19a and 20a that are separated in the circumferential direction, The difference in the amount of springback increases. As a result, the inner diameter or the outer diameter is not the same between the portion where the locking portions 19a and 20a are formed and the portion where the locking portions 19a and 20a are disengaged in the circumferential direction. The shape of the inner peripheral edge or the outer peripheral edge is distorted in the circumferential direction. Of course, the same applies to the case where the folded walls 17 and 18 are formed after the protrusions are bent into the locking portions 19a and 20a. Since the races 4a and 4b may be used by being fitted to the mating member 24 or the casing 20 as shown in FIG. 9, the inner peripheral edge or the outer peripheral edge has a shape as described above. It is not preferable to distort.

JP-A-8-109925 JP 2003-49844 A Japanese Patent No. 2514513

  In view of the circumstances as described above, the present invention realizes a structure in which the cage and each roller can be easily incorporated into the race, or a structure that can prevent distortion of the shape of the inner or outer periphery of the race. Invented as much as possible.

Each of the thrust cylindrical roller bearings of the present invention includes a cage, a plurality of rollers, and a race.
Among these, the cage is in the shape of a ring and is provided with rectangular pockets that are long in the radial direction at a plurality of locations in the circumferential direction.
The rollers are provided in the pockets so as to freely roll.
The race has a race surface that is in rolling contact with the rolling surfaces of these rollers.

In the thrust roller bearing according to the first aspect of the present invention, the race includes an annular portion, an inner diameter side folded wall, and an inner diameter side engaging portion.
Of these, the entire annular portion is formed in an annular shape, and one side is used as the race surface.
Further, the inner diameter side folding wall is formed by bending in the axial direction at the inner peripheral edge portion of the circular ring portion.
Further, the inner diameter side locking portion is formed to protrude radially outward at a plurality of locations in the circumferential direction of the distal end portion of the inner diameter side folded wall.
In the thrust roller bearing according to claim 1, the inner diameter of the race is 20 mm or less.
Then, by engaging only the inner diameter side locking portions and the inner peripheral edge of the cage, the cage and the race are inseparably coupled.
In particular, in the thrust roller bearing according to claim 1, each of the inner diameter side locking portions has only two locations in the circumferential direction, the race has an inner diameter d, and the inner diameter side locking portion of the inner diameter side locking portion. When the width dimension in the circumferential direction is b, (1/5) d ≦ b ≦ (2/5) d is satisfied.

On the other hand, in the thrust roller bearing according to the second aspect of the present invention, the race includes an annular portion, an outer diameter side folding wall, and an outer diameter side locking portion.
Of these, the entire annular portion is formed in an annular shape, and one side is used as the race surface.
Further, the outer diameter side folded wall is formed by being bent in the axial direction at the outer peripheral edge portion of the ring portion.
Further, the outer diameter side locking portions are formed so as to protrude radially inward at a plurality of locations in the circumferential direction of the tip end portion of the outer diameter side folded wall.
In the thrust roller bearing according to claim 2, the outer diameter of the race is 40 mm or less.
Then, by engaging only the outer diameter side locking portions and the outer peripheral edge of the cage, the cage and the race are inseparably coupled.
In particular, in the thrust roller bearing according to claim 2 , there are only two outer diameter side locking portions in the circumferential direction, the outer diameter of the race is D, and the outer diameter side engagement portion. When the width dimension in the circumferential direction of the stop portion is B, (1/10) D ≦ B ≦ (1/5) D is satisfied.

In the case of the thrust roller bearing of the present invention configured as described above, it is possible to improve the assemblability of the cage and each roller into the race. That is, the thrust roller bearing of the present invention is a race having an inner diameter d of 20 mm or less or an outer diameter D of 40 mm or less, so that the inner diameter side folded wall or the outer diameter side folded wall is not easily elastically deformed. Since the inner diameter side locking portion or the outer diameter side locking portion is formed only in two places, the interval between these both locking portions can be widened, and the retainer and each roller can be easily assembled. In the case of the thrust roller bearing of the present invention, the width dimension (b or B) in the circumferential direction of the inner diameter side locking portion or the outer diameter side locking portion is set to the inner diameter d or outer diameter D of the race. Therefore, the strength of the inner diameter side locking portion or the outer diameter side locking portion can be sufficiently secured, and the assemblability becomes better.

  For example, as shown in FIGS. 10 and 12, the inner diameter side locking portion or the outer diameter side locking portion has a predetermined width in the circumferential direction. Even if it is only a place, depending on the width dimension of the direction of the circumference of each of these locking parts, the installation nature to the above-mentioned race of a cage and each roller may deteriorate. That is, when the inner diameter d of the race is 20 mm or less, or the outer diameter D of the race is 40 mm or less and the circumferential widths b and B of the respective locking portions exceed 8 mm, each locking portion The interval between them becomes narrow, and it becomes difficult for the cage and each roller to get over each of the locking portions. Moreover, if the circumferential width dimension of each of these locking portions is increased, the rigidity of the inner diameter side folded wall or the outer diameter side folded wall is increased, and these folded walls are less likely to be elastically deformed. . Therefore, when the width dimensions b and B in the circumferential direction of the respective locking portions are large, the assembling property of the cage and the rollers into the race is deteriorated.

In contrast, in the invention described in claim 1, the width b of the inner diameter side locking portion and 2/5 or less of the inner diameter d of the race, when the invention described in claim 2, the outer diameter side engagement Since the width B of the stopper is set to 1/5 or less of the outer diameter D of the race, the cage and each roller can be incorporated into the race. That is, in the case of the invention described in claim 1 , since the inner diameter d of the race is 20 mm or less, the width dimension b of the inner diameter side locking portion is restricted to 8 mm or less which is 2/5 of the 20 mm. Also in the case of the invention described in claim 2 , since the outer diameter D of the race is 40 mm or less, the width dimension B of the outer diameter side locking portion is restricted to 8 mm or less which is 1/5 of this 40 mm. The Therefore, in any of the inventions, it is possible to secure a space in the circumferential direction between the locking portions, and it is not difficult for the folded walls to be elastically deformed. As a result, it is possible to improve the ease of incorporation of the cage and each roller into the race.

Also, when the inner diameter d of the race is 20 mm or less, or the outer diameter D of the race is 40 mm or less, and the width dimension b of the inner diameter side locking part or the width dimension B of the outer diameter side locking part is less than 4 mm. There is a possibility that the strength of each of the locking portions cannot be sufficiently ensured. And if the intensity | strength of each these latching | locking part cannot fully be ensured, the coupling | bonding of a holder | retainer and a race cannot fully be aimed at. Therefore, in the invention described in claim 1 , the width dimension b of the inner diameter side locking portion is set to 1/5 or more of the inner diameter d of the race, and in the invention described in claim 2 , the outer diameter side locking portion of the outer diameter side locking portion. By setting the width dimension B to be 1/10 or more of the outer diameter D of the race, the width dimensions b and B of the respective locking portions are restricted to 4 mm or more, and the strength of these locking portions is sufficiently ensured. ing. As a result, the retainer and the race can be sufficiently combined.

[First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claim 1 . The feature of this example is that, even if the inner diameter d of the race 4a is 20 mm or less, the inner diameter side locking portion 19c is provided so that the retainer 3 and each roller 2 (see FIG. 9) can be incorporated into the race 4a. , 19c and the width dimension b in the circumferential direction are appropriately regulated. Since other structures and operations are the same as those of the conventional structure shown in FIGS. 9 and 10 described above, overlapping illustrations and descriptions are omitted or simplified, and the following description will focus on the features of this example.

  In the case of the thrust roller bearing of this example, the race 4a is formed by bending the inner diameter side folded wall 17 in the axial direction (front and rear direction in FIG. 1) at the inner peripheral edge of the ring portion 16a. The inner diameter side locking portions 19c and 19c are formed at the tip end portion of the inner diameter side folded wall 17 so as to protrude outward in the radial direction. In the case of this example, each of these inner diameter side locking portions 19c, 19c is formed symmetrically (at a position opposite to the diameter direction) with respect to the central axis of the race 4a. Each of the inner diameter side locking portions 19c, 19c is formed by bending a protruding portion formed in advance at a portion to be the tip of the inner diameter side folded wall 17 outward in the radial direction. The inner diameter d of the race 4a is 20 mm or less. In particular, in the case of this example, the inner diameter side locking portions 19c, 19c are formed at two positions on the opposite side in the diameter direction. Further, the width dimension b in the circumferential direction of each of the inner diameter side locking portions 19c, 19c is set to 1/5 or more and 2/5 or less of the inner diameter d of the race 4a {(1/5) d ≦ b ≦ (2 / 5) is restricted to d}.

  In the case of the thrust roller bearing of this example configured as described above, since the inner diameter of the race 4a is 20 mm or less, the inner diameter side folded wall 17 constituting the race 4a is not easily elastically deformed. However, as described above, the inner diameter side locking portions 19c, 19c are formed only in two places, and the width dimension b in the circumferential direction of each of the inner diameter side locking portions 19c, 19c is set to the inner diameter d of the race 4a. Are properly regulated. For this reason, the strength of each of the inner diameter side locking portions 19c, 19c can be sufficiently secured, and the retainability of the cage 3 and the rollers 2 to the race 4a is improved.

  That is, by setting the width dimension b of the inner diameter side locking portions 19c, 19c to 1/5 or more of the inner diameter d of the race 4a, the strength of the inner diameter side locking portions 19c, 19c can be sufficiently ensured. . As a result, the retainer 3 and the race 4a can be sufficiently coupled. On the other hand, by setting the width dimension b of each inner diameter side locking portion 19c, 19c to 2/5 or less of the inner diameter d of the race 4a, the interval between the inner diameter side locking portions 19c, 19c in the circumferential direction can be increased. By increasing the size, the assembling property of the cage 3 and each roller 2 can be improved.

[ First example of reference example ]
FIG. 2 shows a first example of a reference example relating to the present invention . In the case of this reference example , as in the first example of the above-described embodiment, the inner diameter side locking portions 19d and 19d formed at the distal end portion of the inner diameter side folded wall 17 are symmetrically arranged with respect to the central axis of the race 4a. It is forming a part. However, in the case of this reference example , as in the conventional structure shown in FIG. 11 described above, each of the inner diameter side engagements can be obtained by projecting two circumferentially outward portions of the inner diameter side folding wall 17 radially outward. Stop portions 19d and 19d are formed. For this reason, the width dimension in the circumferential direction of each of the inner diameter side locking portions 19d, 19d is smaller than the structure of the first example of the above-described embodiment .

In the case of this reference example configured as described above, the cage 3 and the rollers 2 (see FIG. 9) can be easily incorporated into the race 4a, but the inner diameter side locking portions 19d, 19d There is a possibility that sufficient strength cannot be secured. Therefore, this reference example is preferably applied to a smaller thrust cylindrical roller bearing (for example, the inner diameter d of the race 4a is 15 mm or less). In the case of a smaller thrust roller bearing, since the cage 3 and each roller 2 are also smaller, the force acting on the inner diameter side locking portions 19d and 19d is reduced, and the inner diameter side locking portions 19d and 19d are reduced. Even if the strength is low, the cage 3 and the race 4a can be prevented from separating. Other structures and operations are the same as those of the first example of the above-described embodiment .

[ Second Example of Embodiment]
FIG. 3 shows a second example of the embodiment of the invention corresponding to claim 1 . In the case of this example, the shape of the race 4c is a crank section. In other words, the inner wall side folding wall 17 is formed from the inner peripheral edge of the ring portion 16a of the race 4c by bending it to one side in the axial direction (the right side in FIG. 3) where the race surface exists. An outer diameter side folded wall 18a is formed by bending the outer peripheral side of the portion 16a to the other side in the axial direction (left side in FIG. 3) opposite to the side where the inner diameter side folded wall 17 is folded. . In the case of this example configured as described above, for example, when the race 4c is incorporated in the mating member 24 as shown in FIG. It is possible to position the race 4a in the radial direction with respect to the mating member 24 by externally fitting it to the part. Other structures and operations are the same as those of the first example of the above-described embodiment .

[ Third example of embodiment]
FIG. 4 shows a third example of the embodiment of the invention corresponding to claim 2 . The feature of this example is that even when the outer diameter D of the race 4b is 40 mm or less, the outer diameter side latching is performed so that the retainer 3 and the rollers 2 (see FIG. 9) can be incorporated into the race 4b. The number of parts 20c and 20c and the width dimension B in the circumferential direction are appropriately regulated. Since other structures and operations are the same as those of the conventional structure shown in FIGS. 9 and 12, overlapping illustrations and descriptions are omitted or simplified, and the following description will focus on the features of this example.

In the case of the thrust roller bearing of this example, the race 4b is formed by bending the outer diameter side folded wall 18 in the axial direction (front and back direction in FIG. 4) at the outer peripheral edge of the annular ring portion 16b. Then, the outer diameter side engaging portions 20c, 20c are formed at the front end portion of the outer diameter side folded wall 18 so as to protrude radially inward. In the case of this example, these outer diameter side locking portions 20c, 20c are formed symmetrically with respect to the central axis of the race 4b. Each of the outer diameter side locking portions 20c, 20c is formed by bending a protruding portion formed in advance at a portion to be the tip of the outer diameter side folded wall 18 inward in the radial direction. . The outer diameter D of the race 4b is 40 mm or less. In particular, in the case of this example, the outer diameter side locking portions 20c, 20c are formed only at two positions on the opposite side in the diameter direction. Further, the width B in the circumferential direction of each outer diameter side locking portion 20c, 20c is set to 1/10 or more and 1/5 or less of the outer diameter D of the race 4b {(1/10) D ≦ B ≦. (1/5) D}.

In the case of the thrust roller bearing of this example configured as described above, since the outer diameter D of the race 4b is 40 mm or less, the outer diameter side folded wall 18 constituting the race 4b is hardly elastically deformed. However, as described above, the outer diameter side locking portions 20c and 20c are formed only in two places, and the width dimension B in the circumferential direction of each of the outer diameter side locking portions 20c and 20c is set to the width of the race 4b. It is properly regulated in relation to the outer diameter D. For this reason, the strength of each of the outer diameter side locking portions 20c, 20c can be sufficiently secured, and the retainability of the cage 3 and each roller 2 to the race 4b is improved.

  That is, by setting the width dimension B of each outer diameter side locking portion 20c, 20c to 1/10 or more of the outer diameter D of the race 4b, the strength of each outer diameter side locking portion 20c, 20c is sufficient. Can be secured. As a result, the retainer 3 and the race 4b can be sufficiently combined. On the other hand, by setting the width dimension B of each outer diameter side locking portion 20c, 20c to 1/5 or less of the outer diameter D of the race, the interval in the circumferential direction of each outer diameter side locking portion 20c, 20c. Can be increased to improve the assemblability of the cage 3 and the rollers 2.

[ Second example of reference example ]
FIG. 5 shows a second example of the reference example related to the present invention . In the case of this reference example , as in the third example of the above-described embodiment, the outer diameter side locking portions 20d and 20d formed at the distal end portion of the outer diameter side folded wall 18 are symmetrical with respect to the central axis of the race 4b. Two places are formed. However, in the case of the present reference example , as in the conventional structure shown in FIG. 13, the outer diameter side folded wall 18 is protruded radially inward at two locations in the circumferential direction so that the outer diameters are increased. Side locking portions 20d and 20d are formed. For this reason, the width dimension regarding the circumferential direction of these outer diameter side latching | locking parts 20d and 20d is small compared with the structure of the 3rd example of the above-mentioned embodiment .

In the case of the present reference example configured as described above, the retainer 3 and the rollers 2 (see FIG. 9) can be easily incorporated into the race 4b, but the outer diameter side locking portions 20d and 20d. There is a possibility that sufficient strength cannot be secured. Therefore, this reference example is preferably applied to a smaller thrust cylindrical roller bearing (for example, the outer diameter D of the race 4b is 35 mm or less). In the case of a smaller thrust roller bearing, since the cage 3 and each roller 2 are also smaller, the force acting on each outer diameter side locking portion 20d, 20d is reduced, and each of these outer diameter side locking portions 20d, Even if the strength of 20d is low, the cage 3 and the race 4b can be prevented from separating. Other structures and operations are the same as in the third example of the above-described embodiment .

[ Fourth Example of Embodiment]
FIG. 6 shows a fourth example of an embodiment of the present invention corresponding to claim 2 . In the case of this example, the shape of the race 4d is a cross-sectional crank type as in the second example of the above-described embodiment. That is, the outer diameter side folded wall 18 is bent from the outer peripheral edge portion of the ring portion 16b of the race 4d to the one side in the axial direction (the left side in FIG. 6) where the race surface exists, and the circle An inner diameter side folding wall 17a is bent from the inner peripheral edge of the ring portion 16b to the other side in the axial direction (right side in FIG. 6) opposite to the side where the outer diameter side folding wall 18 is bent. Yes. In the case of this example configured as described above, for example, when the race 4b is incorporated into a member having a center hole, the inner diameter side folded wall 17a is fitted into the center hole of the member, and the race 4b is thus fitted. Can be positioned in the radial direction with respect to this member. Other structures and operations are the same as in the third example of the above-described embodiment.

[ Third example of reference example ]
FIGS. 7-8 has shown the 3rd example of the reference example regarding this invention . The feature of this reference example is that even when the outer diameter D of the race 4b exceeds 40 mm, even after the outer diameter side engaging portions 20e and 20e are formed on the distal end edge of the outer diameter side folded wall 18, In order to suppress distortion of the shape of the outer peripheral edge of the race 4b, the width dimension B in the circumferential direction of the outer diameter side locking portions 20e, 20e is appropriately regulated. Since other structures and operations are the same as those of the conventional structure shown in FIGS. 9 and 12, overlapping illustrations and descriptions are omitted or simplified, and the following description will focus on the features of this reference example .

In the case of the thrust roller bearing of the present reference example , the race 4b bends the outer diameter side folded wall 18 in the axial direction (front and back direction in FIG. 7, up and down direction in FIG. 8) at the outer peripheral edge of the ring portion 16b. It is formed by. The outer diameter side engaging portions 20e and 20e are formed at the distal end portion of the outer diameter side folded wall 18 so as to protrude radially inward. In the case of this reference example , these outer diameter side locking portions 20e, 20e are formed at three equal intervals in the circumferential direction of the race 4b. Each of the outer diameter side locking portions 20e, 20e is formed by bending a protrusion formed in advance in a portion that becomes the tip of the outer diameter side folded wall 18 inward in the radial direction. . The outer diameter D of the race 4b exceeds 40 mm. In particular, in the case of this reference example, the width dimension (= width dimension in the circumferential direction of each protruding portion) B of each outer diameter side locking portion 20e, 20e is 8 mm or more and 15 mm or less (8 mm ≦ B ≦ 15 mm).

In the case of the present reference example configured as described above, the strength of each outer diameter side locking portion 20e, 20e can be secured, and the distortion of the shape of the outer peripheral edge of the race 4b can be suppressed. That is, even in the race 4b having an outer diameter D exceeding 40 mm, if the width B of the outer diameter side locking portions 20e, 20e is set to 15 mm or less, these outer diameter side locking portions of the outer diameter side folded wall 18 will be described. It is possible to reduce the difference in rigidity between the portion where 20e and 20e are formed and the portion between the outer-diameter side locking portions 20e and 20e that deviate in the circumferential direction. For this reason, when the outer diameter side locking portions 20e, 20e are bent, or when the outer diameter side folded wall 18 is bent, the difference in springback amount between the two portions can be reduced. . And distortion of the shape of the outer periphery of the race 4b can be suppressed. On the other hand, when the width B of each outer diameter side locking portion 20e, 20e is 8 mm or more, the strength of each outer diameter side locking portion 20e, 20e can be sufficiently secured, and the race 4b and the cage 3 can be secured. (See FIG. 9) can be sufficiently prevented from being separated.

The inner diameter of the race exceeds 20 mm, and the width dimension in the circumferential direction of the plurality of inner diameter side engaging portions formed at the tip of the inner diameter side folded wall is the same as the third example of the reference example described above. If it restrict | limits to this, while ensuring the intensity | strength of each said inner diameter side latching | locking part, the distortion of the shape of the inner periphery of the said race can also be suppressed. That is, if the width dimension of each inner diameter side locking portion is restricted to 8 to 15 mm, each inner diameter side when the inner diameter side locking portion is formed or the inner diameter side folded wall is bent. The difference in the amount of springback between the part formed with the locking part and the part deviated in the circumferential direction from each inner diameter side locking part can be reduced, and after forming the inner diameter side folded wall and making the race, The distortion of the shape of the inner periphery of this race can be suppressed. Moreover, the strength of each inner diameter side locking portion can be secured.
The thrust roller bearing of the present invention is not limited to a rotation support portion of an automobile transmission, but can be applied to various rotation support portions that rotate at high speed while supporting a thrust load, such as a rotation support portion of a compressor for a car air conditioner.

The front view which shows the race integrated in the 1st example of embodiment of this invention. The front view which shows the race integrated in the 1st example of the reference example regarding this invention . The fragmentary sectional view which shows the race integrated in the 2nd example of embodiment of this invention . The front view which shows the race similarly integrated in a 3rd example . The front view which shows the race integrated in the 2nd example of the reference example regarding this invention . The fragmentary sectional view which shows the race integrated in the 4th example of embodiment of this invention . The front view which shows the race integrated in the 3rd example of the reference example regarding this invention . Sectional drawing of the half part of the race integrated in the 3rd example of this reference example . The fragmentary sectional view which shows one example of the conventional structure in the assembly | attachment state to a rotation support part. The front view which shows the 1st example of the race of conventional structure. The front view which similarly shows the 2nd example. The front view which similarly shows the 3rd example. The front view which similarly shows the 4th example.

DESCRIPTION OF SYMBOLS 1 Thrust roller bearing 2 Roller 3 Cage 4a, 4b, 4c, 4d Race 5 First cage element 6 Second cage element 7 Pocket 8 First annular portion 9 First inner diameter side cylindrical portion 10 First outer diameter side Cylindrical part 11 First through hole 12 Second annular part 13 Second inner diameter side cylindrical part 14 Second outer diameter side cylindrical part 15 Second through hole 16a, 16b Circular part 17, 17a Inner diameter side folded walls 18, 18a Outer diameter side folding walls 19, 19a, 19b, 19c, 19d Inner diameter side locking portions 20, 20a, 20b, 20c, 20d, 20e Outer diameter side locking portions 21 Casing 22 Holding portion 23 Back surface 24 Mating member 25 End surface

Claims (2)

A ring-shaped cage in which rectangular pockets each extending in the radial direction are provided at a plurality of positions in the circumferential direction, a plurality of rollers provided to freely roll in the pockets, and a rolling surface of each roller. The race has a race surface that is in rolling contact with the race, and the race is formed in a ring shape as a whole. The race has one side surface as the race surface, and an inner peripheral edge of the ring portion in the axial direction. An inner diameter side folding wall formed by bending, and an inner diameter side engaging portion formed so as to protrude radially outward at a plurality of circumferential directions at the tip of the inner diameter side folding wall, In the thrust roller bearing in which the cage and the race are inseparably coupled with each other by engaging only the respective inner diameter side locking portions and the inner peripheral edge of the cage. each inner diameter side locking portions are present only two positions in the circumferential direction The inner diameter of the race d, the width in the circumferential direction of the inner diameter side locking portion when expressed by a and b, respectively, thrust, characterized in that satisfy (1/5) d ≦ b ≦ ( 2/5) d Roller bearing. A ring-shaped cage in which rectangular pockets each extending in the radial direction are provided at a plurality of positions in the circumferential direction, a plurality of rollers provided to freely roll in the pockets, and a rolling surface of each roller. And a race having a race surface that is in rolling contact with the race. The race is formed in a ring shape as a whole, and has an annular portion with one side as the race surface, and an outer peripheral edge of the annular portion in the axial direction. An outer-diameter side folding wall formed by bending, and an outer-diameter side locking portion formed so as to protrude radially inward at a plurality of circumferential positions at the tip of the outer-diameter side folding wall. A thrust roller bearing in which the outer diameter is 40 mm or less, and the cage and the race are inseparably coupled to each other by engaging only the outer-diameter side locking portions and the outer peripheral edge of the cage. in, each outside diameter side locking portions are present only two positions in the circumferential direction The outer diameter of the race when D, and width in the circumferential direction of the outside diameter side locking portion is B, and characterized by satisfying the (1/10) D ≦ B ≦ ( 1/5) D Thrust roller bearing.

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