JPH07259865A - Holder for roller bearing - Google Patents

Abstract

PURPOSE:To increase strength of a connecting location between a pole part and an annular part while forming a thin thickness structure for facilitating forming a pocket. CONSTITUTION:In a cylindrical roller bearing use holder 1 provided with roller receiving pockets 2 in circumferential several parts, thin thickness parts 6 to 8 are provided in an external diametric side except an end part in a side of each annular part 4, 4 in axial directional both sides in a pole part 3 between the pockets 2 adjacent to each other. That is, the thin thickness parts 6 to 8 are formed not over the axial direction total length of the pole part 3, but to form thickness in the end part in a side of the annular parts 4, 4 of the pole part 3 equal to thickness of the annular parts 4, 4. In this way, an axial directional position of a corner part 13, generated in a step differenced part of an external diametric surface from the annular parts 4, 4 over to the pole part 3, is not conformed to an axial directional position of corner pars 14 of a wall surface along the axial direction and a wall surface along the circumferential direction in the pocket 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing retainer, and more particularly to improvement of a column portion between adjacent pockets.

[0002]

2. Description of the Related Art Needles called so-called cage and rollers, which are composed of needle rollers and cages that do not have bearing rings, are used in connecting parts of connecting rods and pistons in internal combustion engines, and automobile transmissions. A tapered roller bearing is installed.

An example of such a bearing retainer will be described with reference to FIGS. 6 and 7. FIG. 6 is a longitudinal sectional view of the cage, and FIG. 7 is a perspective view of a main part of the cage viewed from the outer diameter side. In the figure, 51 is a cylindrical cage, 52 is a pocket, 5
Reference numeral 3 is a pillar portion, 54 is an annular portion, and 55 is a needle roller.

Thin wall portions are formed at three axial positions on the outer diameter side of the entire axial length of the pillar portion 53, that is, the region from the boundary with the annular portion 54 on one side to the boundary with the annular portion 54 on the other side. Recess 5
6, 57 and 58 are provided. Two protrusions 59, 59 are present between each of the three recesses 56 to 58 in the column portion 53. At both ends in the circumferential direction of each of these protrusions 59, 59, a roller slip-out prevention to the outer diameter side is performed. Projections 60, 60 are provided. The protrusions 60, 60 are obtained by rolling the outer diameter surfaces of the protrusions 59, 59 with a roll. On the other hand, knurled grooves 61, 6 along the circumferential direction are provided at two locations on the inner diameter side of the column portion 53 corresponding to the above-mentioned convex portions 59, 59.
1 is formed, and each knurled groove 61, 6 is formed.
Protrusions 6 on both ends in the circumferential direction to prevent the rollers from slipping out toward the inner diameter side.
2, 62 are provided.

In such a conventional cage 51, a peripheral groove is formed on the outer periphery of the cylindrical cage base material before pocket formation for the purpose of reducing punching resistance in punching the cylindrical cage base material. It has a thin wall.

[0006]

By the way, when the needle roller bearing including the retainer 51 is repeatedly rotated, the needle roller 55 repeatedly collides with the column portion 53. Therefore, stress concentrates on the connecting portion between the column portion 53 and the annular portions 54, 54 on both sides.

In the conventional cage 51, the pillar portion 53
The axial position of the stepped corner portion 63 formed at the connecting portion between the annular portions 54, 54 on both sides and the axial position of the corner portion 64 between the wall surface along the axial direction and the wall surface along the circumferential direction in the pocket 52 are Since they substantially coincide with each other, as described above, the column portion 53 and the annular portions 54, 54 where the stress is likely to be concentrated.
A crack is likely to occur along the circumferential direction from the connecting portion with. When such a crack occurs, the pillar 5
Since 3 will be torn off from the base of the annular portions 54, 54, there arises a problem that the pillar portion 53 is caught between the needle roller and its rolling surface, which hinders the rolling guide operation. To do.

In view of such circumstances, it is an object of the present invention to increase the strength of the connecting portion between the column portion and the annular portion while having a thin structure for facilitating the pocket formation.

[0009]

The present invention is configured as follows in a cylindrical roller bearing retainer in which pockets for accommodating rollers are provided at several circumferential positions.

According to the present invention, in the pillar portion between the adjacent pockets, the rollers to the outer diameter side are provided at the two circumferential ends which are axially separated from each other on the outer diameter side excluding the end portions on the respective annular portions on both sides in the axial direction. There are projections for preventing slipping out, and projections for preventing rollers from slipping out to the inner diameter side are provided at both ends in the circumferential direction at two locations axially separated from each other on the inner diameter side of the column portion. Thin portions are formed on both sides of the protrusion forming portion in the axial direction.

[0011]

In the above structure, the thin portion is provided on the outer diameter side of the column portion so that the burden of pocket formation can be reduced. However, without forming a thin portion over the entire axial length of the pillar portion, by making the wall thickness of the annular portion side end portion of the pillar portion the same as the wall thickness of the annular portion, the connecting portion of the pillar portion and the annular portion We are trying to increase the strength.

As a result, the stepped portion of the outer diameter surface from the annular portion to the pillar portion is located closer to the center of the pillar portion in the axial direction, and as a result, the outer diameter surface is stepped from the annular portion to the pillar portion. The axial position of the corner formed in the portion and the axial position of the corner of the wall surface along the axial direction and the wall surface along the circumferential direction in the pocket do not match.

Therefore, as in the case where the roller bearing using the cage of the present invention is repeatedly rotated, the rollers repeatedly collide with the column portion, so that stress is applied to the connecting portion between the column portion and the annular portion. Even when concentrated, cracks are less likely to occur at the connecting portion between the column portion and the annular portion.

The term "thin wall" as used in the present invention means that the working resistance at the time of punching a pocket can be sufficiently reduced and the strength as a cage is not impaired.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS. 1 to 5 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of one embodiment of a cage for needle roller bearings, and FIG. 2 is (2)-(2) of FIG. FIG. 3 is a perspective view of a main part of the cage viewed from the outer diameter side, FIG. 4 is an explanatory view showing a method of forming protrusions of the cage, and FIG. It is a longitudinal cross-sectional view of a usage pattern of a roller bearing including a container. In the figure, 1 is a cylindrical cage, 2 is a pocket, 3 is a column part, 4 is an annular part, and 5 is a needle roller.

The cage 1 is, for example, a JIS standard SCM41.
5, formed of a metal material such as STKM13. Rectangular pockets 2 are bored along the axial direction of the cage 1 at several locations at equal intervals. This adjacent pocket 2
Between them, there is a pillar portion 3 for partitioning them, and the pillar portion 3
Cylindrical annular portions 4 and 4 are provided on both sides in the axial direction of.

On the outer diameter side of the column portion 3, thin-walled portions 6, 7, 8 having a concave cross-section are provided at three axial positions in a region excluding the respective end portions on the both annular portions 4, 4 side. That is, unlike the conventional example, the thin portions 6 to 8 are not formed over the entire axial length of the pillar portion 3, and the thickness of the end portions of the pillar portion 3 on the side of the annular portions 4 and 4 is set to be the thicknesses of the annular portions 4 and 4. Set to the same as the thickness. Then, as a result, two convex portions 9 and 9 for the thin portion are present between each of the three thin portions 6 to 8 in the pillar portion 3, and at both circumferential ends of each of these convex portions 9 and 9. , Projections 10 for preventing the rollers from slipping out to the outer diameter side are provided. The protrusions 10 and 10 are obtained by rolling the outer diameter surfaces of the protrusions 9 and 9 with a roll. Therefore, the protrusions 10, 1
The outer diameters of the convex portions 9 and 9 after the formation of 0 are slightly smaller than the outer diameters of the annular portions 4 and 4, but this means that even if the cage is used as the outer diameter guide, the outer rings are formed by the protrusions 10 and 10. There is no phenomenon such as oil film scraping that causes seizure on the track. On the other hand, knurled grooves 11 and 1 along the circumferential direction are provided at two locations on the inner diameter side of the column portion 3 corresponding to the above-mentioned convex portions 9 and 9.
1 is formed, and each knurled groove 11, 1
Protrusions 1 on the inner diameter side to prevent the rollers from slipping out at both ends in the circumferential direction.
2, 12 are provided.

A manufacturing example of such a cage 1 will be described.
First, although not shown, a pipe material such as JIS standard STKM13 is cut with an appropriate width to obtain a cage base material, and peripheral grooves are formed at three axially separated positions on the outer peripheral surface of the cage base material. Form. By punching a circumferential portion of the cage base material from the outside in the radial direction to the inside using a punch / broaching tool (not shown), a rectangular pocket 2 along the axial direction is formed. As a result, the pillar portion 3 is formed, and the circumferential grooves at the above-mentioned three places become the thin wall portions 6 to 8. Then, as shown in FIG. 4, while applying the rolling roll processing tool A to the convex portions 9 of the cage base material, the knurling tool B is applied to the inner diameter surface of the cage base material.
And rotate both processing tools A and B while pressing them with a predetermined pressure. As a result, the outer diameter surfaces of the projections 9 and 9 are crushed to form the claw-shaped projections 10 and 10 at both ends in the circumferential direction, and the knurled grooves 11 and 11 are formed on the inner diameter surface of the column portion. Lever knurling grooves 11, 1
Claw-shaped projections 12, 12 are formed at both ends in the circumferential direction of 1.
Thus, the outer diameter side projections 10 and 10 and the inner diameter side projection 1
Since 2 and 12 are formed at the corresponding parts in the axial direction and processed at the same time, the processing process can be simplified, and a backup holding jig is used compared to the case where each is processed separately. It can be made cheap without doing.

Further, since the inner diameter side projections 12, 12 are projections formed by knurling, for example, at the time of punching a pocket, the central portion corresponding to the thin portion 7 of the present invention is made thinner, and the circumferential width of the pocket is reduced. The strength of the protrusion forming part can be maintained and the amount of protrusion in the radial direction can be reduced compared to a protrusion that is made smaller, so interference with the accommodated rollers can be reduced and the roller diameter can be maximized relative to the cage thickness. You will be able to accommodate the old days. In other words,
Even if the roller diameter is small, the strength can be maintained sufficiently, so it is most suitable for the small diameter.

By the way, in the cage 1 as described above,
Although the thin-walled portions 6 to 8 are provided on the outer diameter side of the pillar portion 3 to reduce the burden when forming the pocket 2, the thin-walled portions 6 to 8 are not formed over the entire axial length of the pillar portion 3. , The annular portion 4 of the pillar portion 3, the thickness of the end portion on the 4 side is the annular portion 4,
By making it the same as the wall thickness of 4, the pillar portion 3 and the annular portion, 4
We are trying to increase the strength of the connecting part with 4.

By doing so, the stepped portion of the outer diameter surface from the annular portions 4 and 4 to the column portion 3 is located closer to the axial center of the column portion 3, and as a result, the annular portions 4 and 4 are formed.
The axial position of the corner portion 13 formed in the stepped portion of the outer diameter surface from the column to the pillar portion 3 does not match the axial position of the corner portion 14 of the wall surface along the axial direction and the wall surface along the circumferential direction in the pocket 2. Become. Therefore, even if stress is concentrated on the connecting portion between the column portion 3 and the annular portions 4 and 4 due to the repeated collision of the needle roller 5 with the column portion 3, the column portion 3
Cracks are less likely to occur at the connecting portions between the annular portions 4 and 4. Even if a crack occurs with long-term use,
Since this crack is generated in the axial direction from the connecting portion between the pillar portion 3 and the annular portions 4 and 4, the pillar portion 3 is not torn from the root of the annular portion 4 unlike the conventional case.

Needle rollers 5 are attached to the pockets 2 of the cage 1 to form needle roller bearings, for example, as shown in FIG. 5, a connecting portion between the connecting rod 15 and the piston 16 in an internal combustion engine. Intervened in. In FIG.
Reference numeral 17 is a needle roller bearing including the cage 1 and the needle roller 5 described above, 18 is a piston pin, 19 is a small end portion of the connecting rod 15, and 20 is a pin hole of the piston 16. Usually, in order to maximize the load bearing capacity of the bearing, the axial length of the needle roller 5 is set to be substantially the same as the width of the small end portion 19 of the connecting rod 15. Then, the connecting rod 15 is vertically moved up and down, but the small end portion 19 thereof only rotates repeatedly within a required angle range. Therefore, the needle roller 5 of the needle roller bearing 17 is replaced with the column portion 3 of the cage 1. Although it repeatedly collides with the pillar portion 3 of the retainer 1 as described above even in such a situation of use.
Since it does not easily break off from the annular portions 4 and 4, it can contribute to improving reliability. In addition, the needle roller bearing in which the cage 1 and the needle roller 5 of the present invention are combined is also used in a transmission for an automobile, although not shown.

The present invention is not limited to the above embodiment. For example, the cage according to the present invention may be used for a cylindrical roller bearing in addition to the needle roller bearing as described above. Further, it is also possible to adopt a structure in which the protrusions 9 and 9 are not left on the pillar 3. In this case, it is possible to form the knurled grooves 11 and 11 and the projections 12 and 12 on the inner diameter side at positions corresponding to the convex portions 9 and 9.

Further, the cage 1 of the above-mentioned embodiment has an inner diameter guide in which the inner circumference is guided by the outer peripheral surface of the inner member,
An outer diameter guide may be used to guide the outer periphery of the retainer 1 by the inner peripheral surface of the outer member. In any case, however, the guide surface of the cage 1 needs to be a smooth surface because it slides in contact with the counterpart member. However, since the outer diameter surface of the cage 1 can be subjected to centerless polishing, there is a slight cost advantage over polishing the inner diameter surface of the cage 1.

[0025]

According to the present invention, the wall thickness of the column-side end of the column portion is made the same as the wall thickness of the ring portion, while the column portion is made thin so that the burden of pocket formation can be reduced. Thus, the strength of the connecting portion between the column portion and the annular portion is increased. Thereby, the step difference portion of the outer diameter surface from the annular portion to the column portion is located closer to the axial center of the column portion, and as a result, the step portion of the outer diameter surface from the annular portion to the column portion can be formed. Since the axial position of the corner portion and the axial position of the corner portion of the wall surface extending along the axial direction and the wall surface extending along the circumferential direction of the pocket do not coincide with each other, repeated collision of the roller with the column portion causes Even if stress concentrates on the connecting portion between the column portion and the annular portion, it becomes possible to prevent cracks from occurring at the connecting portion between the column portion and the annular portion.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a cage for needle roller bearings according to the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a perspective view of a main part of the cage viewed from the outer diameter side.

FIG. 4 is an explanatory view showing a method of forming protrusions of the cage.

FIG. 5 is a vertical cross-sectional view of a usage state of a roller bearing provided with the same cage.

FIG. 6 is a vertical cross-sectional view of a conventional cage for a needle roller bearing.

FIG. 7 is a perspective view of a main part of the cage viewed from the outer diameter side.

[Explanation of symbols]

 1 Cage 2 Pocket 3 Column part 4 Annular part 5 Needle roller 6 to 8 Thin part of column part

Claims (1)

[Claims] 1. A cylindrical roller bearing retainer in which pockets for accommodating rollers are provided at several circumferential positions, wherein end portions of annular portions on both sides in the axial direction of pillar portions between adjacent pockets are provided. Except for the outer diameter side, there are two protrusions to prevent the roller from slipping out to the outer diameter side at both ends in the circumferential direction at axially separated locations.
Protrusions for preventing the rollers from slipping out to the inner diameter side are provided at both ends in the circumferential direction at two locations axially separated from each other on the inner diameter side of the column portion, and thin-walled on both sides in the axial direction of the protrusion forming portion on the outer diameter side A roller bearing retainer characterized in that a portion is formed.