JP2779788B2 - Manufacturing method of cage for roller bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cage for a roller bearing, and more particularly to a method for manufacturing a cage for a needle roller bearing used in an internal combustion engine or the like.

[0002]

2. Description of the Related Art For example, a roller bearing having a bearing ring and a roller bearing without a bearing ring tends to be used in a fitting portion between a connecting rod and a crankshaft of an internal combustion engine.

[0003] As a conventional cage for a roller bearing of this type, for example, there is one as disclosed in Japanese Patent Application Laid-Open No. 61-266827. This will be briefly described with reference to FIGS.

In the drawing, 1 is a cage for roller bearings, 2 is a roller, 3 is a pocket for accommodating rollers, 4 is an inner circumferential groove having a predetermined width formed in the axial center of the cage 1 and 5 is a circumferential groove. It is a partition part which partitions between adjacent pockets 3 in the direction. The radial thickness at the axial center portion of the partition portion 5 is formed thinner than the other portions by the inner peripheral groove 4, and the thin portion is denoted by reference numeral 6, and the thick portions on both sides are denoted by reference numeral 7. Is attached to each.

The thin portion 6 is provided with an outer projection 8 slightly protruding inward of the pocket from the side surface of the thick portion 7, and the outer projection 8 allows the roller 2 to escape radially outward. Is to be blocked. In addition, the thick portion 7
A concave groove 9 is formed along the circumferential direction on the inner diameter surface of
The open end of the concave groove 9 is provided with an inner protrusion 10 slightly protruding inward of the pocket from the side surface of the thick portion 7.
The inner projection 10 prevents the roller 2 from coming out inward in the radial direction. The above-mentioned concave groove 9 is formed by knurling, and the inner protrusion 10 is obtained by plastic deformation during this knurling.

When the rollers 2 are accommodated in the pockets 3, the rollers 2 are constrained in the pockets 3 so as not to come out in and out in the radial direction, but can move a predetermined amount in the radial and circumferential directions. It has become. In use, the rollers 2 are guided by the side surfaces of the thick portion 7 of the cage 1.

A method of manufacturing this type of roller bearing cage 1 will be briefly described.

First, for example, a cylindrical pipe is cut into a predetermined size to prepare a retainer base material, and an inner peripheral groove 4 is formed substantially at the center of the inner peripheral surface of the retainer base material. Thereafter, as shown in FIG. 4, a suitable punch jig A is provided at several places around the circumference of the cage base material.
To form the pocket 3 [pocket forming step]. Subsequently, the outer peripheral surface of the cage substrate is roughly polished (rough polishing step).

By the way, in the roller bearing retainer 1 manufactured as described above, in the pocket forming step, drooping toward the inner diameter side occurs in the pocket 3 within the range shown by the dashed line in FIG. As a result of the later rough polishing step, the drooping spreads in the circumferential direction, so that the outer peripheral surfaces of the annular portions on both sides in the axial direction of the pocket 3 particularly become wavy in the circumferential direction as shown in FIG.

When the roller bearing retainer 1 is of an outer diameter guide type, the raised portion of the retainer 1, particularly the corrugated portion, is provided.
11 The top portion comes into contact with the inner peripheral surface of the outer ring member such as the connecting rod at almost a point, and the surface pressure at the contact portion is increased, and the lubricating oil film on the inner peripheral surface of the outer ring member is easily scraped off. This causes seizure.

On the other hand, the present inventors super-polished the conventional roller bearing cage 1 by the same method as the method of super-polishing the rollers, and the outer periphery of the cage 1 was obtained. The concept is to make the surface almost circular and eliminate irregularities on the outer peripheral surface. In this super polishing, as shown in FIG. D is pressed with a predetermined pressure, and the cage 1 is rotated by the guide rollers B and C to grind the corrugated portion on the outer peripheral surface of the cage 1 until it reaches the bottom of the deepest recess 12. It is.

[0012]

In the case of a roller bearing mounted between a connecting rod and a crankshaft, a two-part cage may be used. This two-piece cage can be obtained by splitting the cage 1 formed as described above. In this two-piece cage, as described above, when the unevenness of the outer peripheral surface is eliminated, The retainer may come into close contact with the inner peripheral surface of the connecting rod due to lubricating oil interposed therebetween. For this reason, there is a concern that the retainer may be dragged and the rotational balance may be easily deviated. On the other hand, if the outer peripheral surface of the retainer is left corrugated without being super-polished, the above-described inconvenience such as image sticking occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and suppresses the contact surface pressure between the outer peripheral surface and the inner peripheral surface of the outer ring as small as possible to prevent seizure from occurring. However, it is an object of the present invention to provide a cage in which the rotation performance is improved by preventing the generation of a sucking action on the inner peripheral surface of the outer ring member particularly in the case of a two-part structure.

[0014]

According to the present invention, a substantially cylindrical shape is provided.
None, several roller pockets are formed around the circumference,
The center of the pocket is shorter than the axial length of the pocket.
Outer side than the pitch circle diameter of the roller accommodated in one pocket
Roller that is formed to be thin by a circumferential groove that reaches
A method of manufacturing a cage for a bearing, comprising preparing a cage base material obtained by cutting a cylindrical pipe into a predetermined size, and forming an inner circumferential groove substantially at the center of the inner circumferential surface of the cage base body in the axial direction. Forming and center
Central thin portion with through a step of providing a thin-walled portion and the thick portion of the both sides, in the radial direction in the circumferential number Kesho cage base
Punching and forming a substantially rectangular roller accommodating pocket extending from the thick portion on both sides to the outer peripheral surface of the cage base material , the pocket forming process and the coarse polishing process. with the inevitably cylindrical surface of each of the surface apex having a constant radius of curvature of each ridge of the corrugations generated in the thick portion outer peripheral surface of the retainer base, said corrugated portion
Super lab so that the hollow of the minute
Polishing step .

In the cage obtained by the above manufacturing method, when the cage contacts the inner peripheral surface of the outer ring member,
Since the partial cylindrical surface of the outer peripheral surface of the retainer comes into contact with the inner peripheral surface of the outer ring member, the contact surface pressure can be suppressed small, and there is no fear that the lubricating oil film is scraped off.

Although the cage and the outer ring member come into surface contact with each other at several places on the circumference as described above, both ends of the cage in the axial direction are provided.
Since the hollow portion is left on the outer peripheral surface of the thick wall portion and this forms a gap between the inner peripheral surface of the outer ring member, the cage and the outer ring member are less likely to be in close contact with each other due to the intervention of gas into the gap portion. , And the rotation balance is easily stabilized.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the cage obtained by the present invention. In the drawings of the embodiment, the same components as those of the conventional example shown in FIG. 5 are denoted by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the configuration different from the conventional example is as follows.
This is the shape of the outer peripheral surface of the annular portion at both ends in the axial direction of the retainer 1.

More specifically, in the conventional cage 1 having the structure shown in FIGS. 2 and 3, the outer peripheral surface of the cage 1 is prevented from becoming wavy due to the pocket forming step and the rough polishing step. Since the unavoidably generated waveform portion is not processed, the following process is performed to leave the concave portion 12 of the waveform portion at several places on the outer peripheral surface of the annular portion at both ends in the axial direction of the retainer 1. In addition, the surface of the ridge 11 between the depressions 12 is formed in a partially cylindrical shape. The reference numeral 13 is attached to the partially cylindrical surface of the raised portion 11.

Next, an example of a procedure for manufacturing the cage 1 of the present invention will be described.

As described in the conventional example, the step of forming the inner peripheral groove 4 in the cylindrical retainer substrate, the step of forming the pocket 3 in the retainer substrate, and the rough polishing of the outer peripheral surface of the retainer substrate Up to the same step, and the operation contents of the subsequent step of super-polishing the outer peripheral surface of the cage base material are different from those of the conventional example.

This super polishing step is performed in the same manner as in FIG. 6, but the polishing amount is regulated as follows. That is,
The surface of each top of each raised portion 11 of the waveform portion inevitably generated by the pocket forming step and the rough polishing step is formed into a partial cylindrical shape having a constant radius of curvature,
To intentionally leave each depression 12 of the wavy portion shallow,
The outer peripheral surface of the cage 1 is polished. For example, by polishing to the position indicated by the imaginary line in FIG. 6, the outer peripheral surface shape as shown in FIG. 1 is obtained.

The height difference Δh ₁ between the raised portion 11 and the recessed portion 12 of the corrugated portion after the rough polishing is, for example, about 60 to 70.
Since it becomes [mu] m, in consideration of it, to set to a depth Delta] h ₂ of the recess 12 after the superabrasive machining falls within the range of about 5~50μm are preferred.

In the cage 1 having been subjected to such surface treatment, when it comes into contact with the inner peripheral surface of the outer ring member, the partial cylindrical surface of the annular outer peripheral surfaces at both ends in the axial direction of the retainer 1
13 comes into surface contact with the inner peripheral surface of the outer ring member,
Not only the surface pressure at the time of contact is small, but also the scraping of the lubricating oil film formed on the inner peripheral surface of the outer ring member is greatly reduced. Further, when the cage 1 comes into contact with the outer ring member, a gap is formed between the concave portion 12 between each of the partial cylindrical surfaces 13 and the inner peripheral surface of the outer ring member, and gas intervenes in this gap. The phenomenon that the retainer 1 sticks to the inner peripheral surface of the outer race member does not occur. Therefore, inconveniences such as seizure due to contact between the outer ring member and the cage 1 and improper rotation balance of the cage 1 due to close contact of the cage 1 with the outer ring member can be avoided.

In the above embodiment, the connecting portion between the concave portion 12 and the partial cylindrical surface 13 may be rounded.

[0027]

As described above, according to the present invention,
As a result, it is possible to obtain a retainer that can reduce the surface pressure at the time of contact with the outer ring member as much as possible and can also prevent the close contact with the outer ring member, so that seizure of the retainer can be avoided and rotation performance can be improved. Become.

As described above, according to the present invention, it is possible to provide a roller bearing retainer that satisfies increasingly severe requirements in recent years.

[Brief description of the drawings]

FIG. 1 is a shape measurement diagram showing a shape of an outer peripheral surface of an annular portion at both axial ends of a roller bearing cage obtained by a manufacturing method of the present invention.

FIG. 2 is a longitudinal sectional view schematically showing a conventional example of a roller bearing retainer.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a schematic view showing a form in which a pocket is punched out.

FIG. 5 is a shape measurement diagram corresponding to FIG. 1 of a conventional example.

FIG. 6 is a schematic view showing an embodiment in which the outer peripheral surface of the cage is super-polished.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... cage, 2 ... roller, 3 ... pocket, 4 ... inner peripheral groove, 5 ... partition part, 6 ... thin part, 7 ... thick part, 8 ... outer protrusion, 10 ... inner protrusion, 11 ... raised part, 12: hollow, 13: partial cylindrical surface.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shiro Masuda 3-8-26 Goshiro, Utsunomiya City (56) References Japanese Utility Model 1-168014 (JP, U) Japanese Utility Model Utility Model 52-29342 (JP, U) 2. NTN Bearing Engineer (No. 52) “Split Needle Roller Bearings for Two-Cycle Engines” (published by NTN Toyo Bearing Co., Ltd.) Published May 1986, pages 68-73 (especially page 70) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16C 33/46

Claims (1)

(57) [Claims] 1. A roller having a substantially cylindrical shape and being collected at several locations around the circumference.
A pocket is formed, and the central part in the axial direction is
The width must be shorter than the axial length and stored in a pocket.
Circumferential groove that extends to the outer peripheral side from the pitch circle diameter of the filter
To manufacture cages for roller bearings with a thin configuration
Method, a cage base material prepared by cutting a cylindrical pipe into a predetermined size is prepared, and an inner circumferential groove is formed substantially at the center of the inner circumferential surface of the cage base body in the axial direction, and a central thin portion is formed. Work to provide thick parts on both sides
And penetrate radially in several places around the circumference of the cage
Approximately rectangular roller storage from the center thin part to the thick part on both sides
Forming punched use pockets, a step of rough polishing the outer peripheral surface of the retainer base, part of the waveform generated in the thick portion outer peripheral surface of unavoidably retainer substrate by said pocket forming step and the rough polishing step The surface of each of the tops of the ridges is a cylindrical surface having a constant radius of curvature, and the depression of the corrugated portion is
Super-polishing so as to remain in the pocket.
A method of manufacturing a roller bearing retainer , characterized in that :