JPH08792U - Roller bearing cage - Google Patents

Abstract

(57) [PROBLEMS] To provide a cage for roller bearings having sufficient strength and less torque loss. A roller bearing cage having a cylindrical shape and having roller housing pockets 2 formed at several circumferential positions,
The central portion in the axial direction is formed thinner by an inner circumferential groove 3 having a width shorter than the axial length of the pocket 2 and reaching the outer peripheral side of the pitch circle diameter of the rollers housed in the pocket 2. Thin part 3 in partition 4 between 2
A protrusion 7 for preventing the roller from slipping outward is formed, and the opening edge of the pocket 2 on the outer diameter surface side of the partition 4 is defined by the pocket 2
Located inward in the radial direction from the outer diameter surface positions of the annular portions on both axial sides of the.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a cage for roller bearings, and more particularly to a cage for needle roller bearings used in internal combustion engines and the like.

[0002]

[Prior art]

 For example, at a fitting portion between a connecting rod and a crankshaft of an internal combustion engine, a roller bearing including a roller without a bearing ring and a cage tends to be used.

As a conventional roller bearing cage of this type, as shown in FIG. 8, a thin ring-shaped body is formed into an M-shaped cross section by drawing, and a pocket A ₁ for housing the roller is formed through a window hole. The molded so-called M-shaped cage A is widely used because it is easy to mold and is lightweight.

[0004]

[Problems to be solved by the device]

However, since the M type cage A has a thin basic structure, it cannot meet the demand for securing the strength of the cage of the roller bearing for the connecting rod, which is becoming faster. Also, the width between the adjacent pockets A ₁ (width in the circumferential direction of the partition A ₂ ) cannot be reduced below a certain value due to the strength problem, and the number of accommodated rollers is limited. In addition, the load capacity of roller bearings cannot be improved.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a roller bearing retainer having sufficient strength and less torque loss.

[0006]

[Means for Solving the Problems]

 The present invention has the following configuration in order to achieve such an object.

That is, the roller bearing cage according to the present invention is a roller bearing cage having a cylindrical shape and having pockets for accommodating the hollows formed at several circumferential positions, wherein the axial center portion is It has a width smaller than the axial length of the pocket and is formed thin by an inner circumferential groove that extends to the outer peripheral side of the pitch circle diameter of the rollers accommodated in the pocket, and the thin portion at the partition between the pockets. A protrusion to prevent the roller from slipping outward, and the pocket opening edges on the outer diameter surface side of the partitioning portion are radially inward from the outer diameter surface positions of the annular portions on both axial sides of the pocket. It is characterized by being located at.

The operation of the configuration of the present invention is as follows.

The entire partition between the pockets of the cage is not made thick, but the central portion in the axial direction is made thin, so that when punching the pocket with a processing tool such as a punch, and when punching the processing tool after drilling. Since the machining resistance at the time is also reduced, the machining time is naturally shorter and the life of the machining tool is longer than that of the thicker one with the same wall thickness in the axial direction.

Further, when the rollers are housed in the pockets, it is necessary to push the rollers from the outer diameter side of the pockets. Since the protrusions are provided to prevent the rollers from slipping out, when the roller is pushed in, the partition part elastically bends due to the presence of the thin part, which allows the roller to be stored in the pocket relatively easily. Will be. Moreover, when the rollers are housed in the pocket, the partition elastically returns to its original state, so there is no risk of deformation.

Further, the pocket opening edges on the outer diameter surface side of the partition portion are located inward in the radial direction from the outer diameter surface positions of the annular portions on both axial sides of the pocket. Since the scraping action of the lubricating oil by the edge of the pocket opening edge is reduced, torque loss during rotation of the roller bearing cage can be suppressed to a small level.

[0012]

[Embodiment of device]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 5 show one embodiment of the present invention. FIG. 1 is a vertical cross-sectional view showing a main part of a roller bearing cage, FIG. 2 is a partial cross-sectional view showing a cage in which rollers are held, and FIG. 3 is a perspective view schematically showing the entire roller bearing cage. FIG. 4 is a perspective view showing a punch for forming a pocket, and FIG. 5 is an explanatory view schematically showing the inner surface of the pocket after punching.

In the drawing, 1 is a roller bearing retainer, 2 is a roller accommodating pocket, 3 is an annular inner peripheral groove having a predetermined width formed in the axial center portion of the retainer body, and 4 is an adjacent pocket. It is a partition between the two. The radial thickness in the axially central portion of the partition portion 4 corresponding to the position where the inner circumferential groove 3 exists is formed thinner than other portions, and the thin portion is denoted by reference numeral 5 and both sides thereof. Reference numeral 6 is attached to the thick portion of the.

The thin portion 5 is provided with a protrusion 7 slightly protruding inward of the pocket from the side surface of the thick portion 6 in the partition portion 4 to prevent the roller 8 from coming out in the radial direction. It is supposed to do. In addition, the thick-walled portion 6 is formed with a linear groove recess 9 along the circumferential direction, and the opening end of the linear groove recess 9 projects slightly inward from the side surface of the partition 4 into the pocket. It has a projection 10 which is made to move. The linear recesses 9 and the projections 10 are formed by knurling, and the projections 10 function to prevent the rollers 8 from coming out radially inward.

On the inner surface of the pocket 2, particularly, the side surface of the thick portion 6 of the partition portion 4 and the side surface of the thin portion projection 10 are formed by shearing in the range of about 1/3 of the outer diameter side, The remaining about 2/3 of the inner diameter side is formed by fracture. The surface formed by shearing is indicated by reference numeral 11, and the surface formed by fracture (represented by spots in the figure) is indicated by reference numeral 12. Since the fractured surface 12 is not as smooth as the sheared surface 11 and is relatively rough, it is easy to retain the lubricating oil.

In the roller bearing cage 1, in order to form the pocket 2, several positions in the circumferential direction of the cylindrical base material having the inner circumferential groove are sequentially formed by using a punch 20 as shown in FIG. Multiple pockets 2 are obtained by punching in the punching direction from the radial outside to the inside (see arrow). When observing the inner surface of the pocket 2 obtained by this punching, as shown in FIG. 5, usually, the sagging 13 at the opening end on the outer diameter side of the pocket 2 and then in the range of about 1/3 of the radial thickness. Further, a shear surface 11 by the cutting edge 21 of the punch 20, a fracture surface 12 in a range of about ⅔, and a burr 14 on the inner diameter side open end of the pocket 2 are continuously formed. The roller bearing cage 1 of the present invention is set as described above, paying attention to the shape of the cut surface formed by punching. In other words, by arranging the protrusion 7 that prevents the roller from coming out in the radial direction in the roller bearing cage 1 on the outer diameter side formed by punching shearing, the surface state of the protrusion 7 is made smooth, The finishing process that was necessary in the past was omitted.

Therefore, in the cage of this embodiment, the surface precision of the protrusions 9 of the pocket 2 and the precision of the spacing L between the protrusions 9 can be improved while reducing the number of processing steps in the process of forming the pocket 2 as compared with the conventional case. It can be secured stably. Moreover, since the fracture surface 12 generated by punching can be used as a lubricant oil reservoir, the effect of supplying lubricant oil to the sliding contact portion at the time of high speed rotation is superior to that of the cage having the conventional structure.

By the way, when punching out the punch 20 after punching when forming the pocket 2 described above, generally, as shown in FIG. 6, the drool 13 formed at the outer diameter side opening end of the pocket 2 is removed by the punch 20. It may be projected to the radial side and may become a flash 13a. This flash 13a may be subjected to a normal flash removing process. In this embodiment, however, as shown in FIG. 7, in order to remove the flash 13a, the shape of the outer diameter surface of the partition 4 is set in the circumferential direction. Was processed to have roundness.

According to the roller bearing cage 1 having the partition portion 4 of this shape, the scraping action of the lubricating oil by the edge of the pocket opening edge is reduced as compared with the case where the flash 13a is simply removed. It is possible to suppress torque loss during rotation of the cage 1.

[0021]

[Effect of device]

 According to the present invention, the following effects are exhibited.

That is, the entire partition between the pockets of the cage is not made thick, but the central portion in the axial direction is made thin. Therefore, when punching and punching the pocket with a processing tool such as a punch or after punching. Since the processing resistance when pulling out the processing tool is also reduced, the processing time is naturally shorter and the service life of the processing tool is longer than in the case of the same thickness with the same axial thickness.

Further, in this roller bearing cage, when the rollers are to be housed in the pockets, the rollers must be pushed in from the outer diameter side of the pockets, but the axial center portion of the partition between the pockets is Since the thin part has a protrusion to prevent the roller from slipping out to the outside diameter side, when the roller is pushed in, the partition part elastically bends due to the presence of the thin part, which makes the roller relatively easy. Will be stored in the pocket. Moreover, when the rollers are housed in the pockets, the partition part elastically returns to its original state, so there is no fear of deformation.

Further, the pocket opening edge on the outer diameter surface side of the partition portion is positioned inward in the radial direction from the outer diameter surface positions of the annular portions on both sides in the axial direction of the pocket. Since the scraping action of the lubricating oil by the edges of the edges is weakened, a high performance roller bearing cage can be obtained in which torque loss during rotation is reduced.

In this way, it is possible to provide a high performance roller bearing retainer that has strength by making necessary parts thick and has little torque loss.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a roller bearing cage.

FIG. 2 is a partial cross-sectional view showing a cage in which rollers are held.

FIG. 3 is a perspective view schematically showing the entire roller bearing cage.

FIG. 4 is a perspective view showing a punch for forming a pocket.

FIG. 5 is an explanatory view schematically showing the inner surface of the pocket after punching.

FIG. 6 is a diagram for explaining a post-treatment in the pocket forming process, which is a cross-sectional view before the treatment showing an opening edge of the pocket outer diameter side

FIG. 7 is a diagram for explaining post-processing in the pocket forming process, which is a cross-sectional view after the processing corresponding to FIG. 6;

FIG. 8 is a vertical cross-sectional view showing a conventional M-type cage.

[Explanation of symbols]

 2 ... Pocket 3 ... Inner peripheral groove 4 ... Partition part 5 ... Thin part 6 ... Thick part 7 ... Protrusion 11 ... Shear surface 12 ... Broken surface

Claims (1)

[Scope of utility model registration request] 1. A cage for roller bearings having a cylindrical shape and having pockets for accommodating rollers formed at several circumferential positions, wherein the axial center portion has a width shorter than the axial length of the pocket. Is formed to be thin by an inner circumferential groove that reaches the outer circumferential side of the pitch circle diameter of the roller accommodated in the And a pocket opening edge on the outer diameter surface side of the partition, which is located radially inward from the outer diameter surface positions of the annular portions on both axial sides of the pocket. vessel.