JPH06117440A - Retainer for roller bearing - Google Patents

Abstract

PURPOSE:To enable the transfer supply of a lubricant to the peripheral surface of a roller so as to suppress temperature rise and improve durability. CONSTITUTION:In a roller bearing retainer 1 with pockets 2 formed in several places at the circumference, plural micro recessed parts serving as lubricating oil reservoirs are provided at the whole inner face of the axial middle part A and both axial side parts B, C of a column part 3 for separating each pocket 2. At the time of use, a lubricant is collected into these micro recessed parts 6, and when a roller 5 comes in contact with the inner face of the column part 3, the lubricant in the micro recessed parts 6 is transfer-supplied to the peripheral surface of the roller 5. The oil film of the lubricant is thereby formed continuously on the peripheral surface of the roller 5, so that the lubricating state of the sliding contact part of the roller 5 and column part 3 becomes desirable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage for roller bearings having a structure in which at least one of the inner and outer diameter side portions of the pillar portion between punched pockets is plastically deformed to project in the circumferential direction. In particular, it relates to improvement of a sliding contact portion of rollers in a cage.

[0002]

2. Description of the Related Art Conventionally, rectangular pockets are punched out at predetermined intervals in the longitudinal direction of a strip-shaped steel plate, and the inner and outer diameter side portions of the roller contact surface of the pillar portion between these adjacent pockets are circumferentially processed by coining. After plastically deforming so that it protrudes, the strip steel plate is rolled into a cylindrical shape and the ends are welded,
There is a roller bearing retainer manufactured by such a procedure.

In the coining process described above, for example, as shown in FIG. 6, two pairs of tools 55, 55 are provided in the pockets 51, 51 on both sides of the target column portion 52 in the strip-shaped steel plate 50.
Is inserted, and the column portion 52 is pinched from both sides in the circumferential direction by each of these tools 55, 55 and compressed. When this coining process is applied, both tools 55,
Depressions 52a, 52 corresponding to the convex portions 55a, 55a of 55
a is transferred and formed, and the column portion 52
The inner and outer diameter side portions of the are plastically deformed and can be projected in the circumferential direction. The protruding portions are denoted by reference numerals 53 and 54.

[0004]

In the roller bearing retainer having the above-described structure, the roller 5 is formed on the inner surface of the column portion 52.
6, the roller 56 comes into line contact with the inner surface of the column portion 52 due to this guide, and the lubricant oil film formed on the peripheral surface of the roller 56 is easily scraped off. Problems such as abnormal heat generation and seizure are likely to occur.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to transfer and supply a lubricant to the circumferential surface of a roller to form an oil film and improve durability.

[0006]

In order to solve such a problem, the present invention is directed to the inner / outer diameter side portion of the pillar portion between the roller holding pockets punched and formed at several circumferential positions. In a roller bearing cage, at least one of which is projected in the circumferential direction by plastic deformation, and the projected portion prevents the roller from slipping inward or outward in the radial direction, the following configuration is adopted. .

In the roller bearing cage according to the present invention, a plurality of minute recesses for accumulating the lubricating oil are provided on at least the inner surface of the protruding portion that is in sliding contact with the rollers.

[0008]

Since the lubricating oil collects in a plurality of minute concave portions provided on the inner side surface of the column portion, when the roller slides on the inner side surface, the lubricant in the minute concave portion is surrounded by the circumference of the roller. As a result, the lubricant oil film is formed on the peripheral surface of this roller. This is done every time the roller makes one revolution. Therefore, the lubrication condition of the sliding contact portion between the roller and the pillar portion is improved, and abnormal temperature rise and wear can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. Roller bearing cage 1 in the example
Is formed in a cylindrical shape in which the entire circumference of the axially intermediate portion bulges outward, and pockets 2 ... It is formed over both sides.

A pillar portion 3 for separating each of the pockets 2
... is coined, and this pillar 3
As shown in FIG. 3, the cross section of the axial intermediate portion A of FIG. 3 has an inverted trapezoidal shape, and the cross sections of the axially opposite side portions B and C of the pillar portion 3 have a whitish shape as shown in FIG. Are formed respectively. That is, the axial intermediate portion A of the pillar portion 3
The width of the column in the circumferential direction gradually increases toward the outer diameter side, and as shown in FIG. A projecting piece 4 is provided that projects like a tongue in the direction. In addition, the circumferential width dimension of the axially opposite side portions B and C of the column portion 3 becomes narrower from the outer diameter side to the inner diameter side by a thickness of about 1/3, and then the remaining 2/3 gradually widens. In other words, the inner diameter sides of the inner side surfaces of the axially opposite side portions B, C of the column portion 3 are projected in the circumferential direction.

That is, the intervals between the protrusions 4 of the axially intermediate portions A of the adjacent pillars 3 are smaller than the diameter dimension of the roller 5, so that the roller 5 is prevented from slipping out to the outer diameter side. Has become. Further, the intervals between the inner diameter side taper surfaces of the axially opposite side portions B and C of the adjacent pillar portions 3 are smaller than the diameter dimension of the roller 5, so that the roller 5 is prevented from slipping out to the inner diameter side. ing.

A minute concave portion 6 is provided on the roller sliding contact surface or the entire inner surface of the axially intermediate portion A and the axially opposite side portions B and C of the column portion 3, and a lubricant is provided here when used. Will be accumulated. That is, when the roller 5 slides on the inner surface of the column portion 3, the lubricant accumulated in the minute recesses 6 is transferred and supplied to the peripheral surface of the roller 5.
A lubricant oil film is formed on the peripheral surface of the. This is done every time the roller 5 makes one revolution. Therefore, the sliding state of the roller 5 and the column portion 3 is in a good lubricating state, and abnormal temperature rise and wear can be prevented.

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

First, as a treatment before coining the column portion 3, the protrusion of the strip-shaped steel sheet to the inner diameter side due to the plastic deformation during coining does not protrude to the inner diameter side from the inner peripheral surfaces of the annular portions at both ends of the cage. In consideration of the amount of protrusion, the axially opposite side portions B and C of the column portion 3 are bulged toward the outer diameter side to float the inner diameter side by h1 (see FIG. 5A). The bulging portion is marked with 3x. The strip-shaped steel sheet formed in this way is cut to an appropriate length, the widthwise intermediate portion is bulged to one side over the entire length, and several pockets are punched with a punching jig to form a plurality of pockets. 2 is obtained [see FIG. 5 (b)]. At this time, the shape of the protruding piece 4 is simultaneously processed.

Thereafter, coining processing is performed on each of the pillar portions 3 (see FIG. 6 of the conventional example). By coining, the axially intermediate portion A and the axially opposite side portions B and C of the pillar portion 3 are shown in FIG.
In addition to having the shape shown in FIG. 4, a plurality of minute recesses 6 are formed on the inner side surface of the column portion 3 [see FIG. 5 (c)]. The minute recesses 6 are transferred and formed from protrusions provided on the compression processing surface of the tool used for coining. When this coining process is performed, the inner and outer diameter side portions of the entire axial direction of the column portion 3 slightly protrude inward and outward in the radial direction, but since the inner diameter side floats as described above, the inner diameter Even if it projects to the side, the above-mentioned floating dimension h1 only needs to be reduced to h2. When the protrusion is generated without performing such a process for preventing the protrusion on the inner diameter side, the cylindrical shape of the strip-shaped steel sheet is collapsed during the rounding process described later.

Then, the strip-shaped steel plate is rolled into a cylindrical shape and the ends are welded to complete the process. At the time of this rounding, the strip-shaped steel plate is wound around a round bar-shaped receiving die (not shown). In this case, if there are overhangs such as "burrs" on both end surfaces of the strip-shaped steel plate, Similar to the overhang at the time of coining, this overhang causes the strip-shaped steel plate to rise from the peripheral surface of the receiving die, resulting in a collapse of the shape. In consideration of this, in this embodiment, as shown in FIG. 1, by chamfering the inner diameter side of the edge of the strip-shaped steel sheet to be the joint 7 into a taper shape, the strip-shaped steel sheet is wound around the receiving die. The shape of the cylinder can be maintained.

In the present invention, the roller stop portion on the inner diameter side is formed to extend to the plastically worked surface by coining, that is, the roller sliding contact surface, while the roller stop portion (projection piece 4) on the outer diameter side is coined. It is formed by punching at the same time when forming the pocket, separately from the plastically worked surface by working, that is, the roller sliding contact surface. As a result, in plastic working,
Since the protruding piece 4 is formed by punching, which covers the drawback that the open end of the pocket in the circumferential direction cannot be strictly controlled and the punching process is relatively easy to perform, snap-in of the roller into the pocket is reliably performed. However, depending on the accuracy control of the coining process, the roller stopper may be formed continuously on the plastically machined surface as it is on the outer diameter side as well as the inner diameter side without the protruding piece 4.

The present invention is not limited to the above embodiment. For example, it is effective to form the minute recesses 6 only on the inner diameter side tapered surfaces of the axially opposite side portions B and C of the inner side surface of the column portion 3. Further, the axially intermediate portion A of the column portion 3 of the cage 1 is not shaped to bulge to the outer diameter side, but the axially opposite side portions B and C are bulged to the outer diameter side, contrary to the above embodiment. The present invention can be applied to the retainer 1 having various shapes such as a shape.

[0019]

As described above, according to the present invention, when the roller comes into contact with the inner surface of the column portion during use, the lubricant in the minute concave portion is transferred to the peripheral surface of the roller. As a result, the lubricant oil film is continuously formed on the peripheral surface of the roller, and the lubrication state of the sliding contact portion between the roller and the column can be improved for a long period of time. Therefore, when using this cage,
The rotation resistance of the roller bearing can be maintained almost constant, and abnormal heat generation and seizure can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of a roller bearing cage according to an embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line (3)-(3) of FIG.

FIG. 4 is a sectional view taken along line (4)-(4) of FIG.

5 is a side view showing a forming process of the roller bearing cage of FIG. 1. FIG.

FIG. 6 is a side view showing a form of coining for a conventional roller bearing cage.

[Explanation of symbols]

1 Cage 2 Pocket 3 Pillar 5 Roller 6 Micro recess

Claims (2)

[Claims] 1. At least one of the inner and outer diameter side portions of the column portion between the roller holding pockets punched and formed at several circumferential positions is made to project in the circumferential direction by plastic deformation, and this projecting portion. A roller bearing retainer configured to prevent the rollers from slipping inward or outward in the radial direction, wherein a plurality of lubricating oil reservoirs are provided on at least the inner surface of the column portion that is in sliding contact with the rollers. The cage for roller bearings, characterized in that: 2. The cage for roller bearings according to claim 1, wherein the minute recesses are formed at the same time when the column portion is plastically deformed.