JPH08200373A - Cage for radial roller bearing - Google Patents

Abstract

PURPOSE: To prevent damage such as scratches from being generated on a mating face facing the end edge of a cage and improve the durability of a rotation support section assembled with a radial roller bearing. CONSTITUTION: Corrugated irregularities continued with multiple recesses 8, 8 and projections 9, 9 in turn are formed at both end edges of a cage 4a. When the cage 4a is displaced in the axial direction, the tip sections of the projections 9, 9 are rubbed against a mating face. The lubricant fed to the rubbing face from the portions of the recesses 8, 8 prevents the occurrence of the metallic contact at the rubbing face portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The cage for radial roller bearings according to the present invention is used in a state of being incorporated in a rotation supporting portion of various mechanical devices. In this specification, the term "radial roller bearing" includes a radial needle bearing, and the term "roller" includes a needle.

[0002]

2. Description of the Related Art FIG.
A radial roller bearing 1 as shown in 4 is incorporated.
The radial roller bearing 1 comprises a race 2, a plurality of rollers 3, 3, and a cage 4. The race 2 is formed of stainless steel or other hard metal plate into a cylindrical shape, and has folded portions 5, 5 having a U-shaped cross section at both ends in the axial direction (the left-right direction of each portion). Further, the cage 4 is formed of a metal plate such as stainless steel into a cylindrical shape as a whole. Further, a plurality of pockets 6, 6 are provided in the axially intermediate portion of the cage 4 at equal intervals in the circumferential direction. Each of these pockets 6 and 6 is a rectangular through hole, and one of the rollers 3 and 3 is provided inside each of them.
Holds rolling freely. In addition, step portions 7 and 7 are formed at two positions near both axial ends of the cage 4, respectively.
Both ends of each of the pockets 6 and 6 are formed by the step portions 7 and 7
It has reached the formation part.

A radial roller bearing 1 constructed as described above
In the state of use of, the race 2 is externally fitted and fixed to, for example, a housing (not shown), and inside the plurality of rollers 3 and 3,
For example, a rotary shaft (not shown) is inserted. In this state, the rotary shaft is rotatable inside the housing. still,
There is also a radial roller bearing in which the race 2 is omitted depending on the application.

[0004]

In the case of the radial roller bearing 1 constructed and used as described above, the axial end edges of the race 2 rub against each other on the basis of the axial load, and the other surface is rubbed against each other. May be damaged. That is, the radial roller bearing has a large rigidity with respect to a radial load, but has a low rigidity with respect to an axial load. Therefore,
When an axial load is applied to the rotary support portion on which the radial roller bearing 1 is installed, the members constituting the rotary support portion, such as the housing and the rotary shaft, are relatively easily displaced in the axial direction. .

In this way, the housing and the rotary shaft are displaced in the axial direction, and when the rollers 3, 3 are displaced in the axial direction due to this displacement, the cage 4 holding the rollers 3, 3 is also the same. Displaces in the axial direction. As a result, the axial end edge of the cage 4 rubs against the inner side surface of any one of the pair of folded-back portions 5, 5 formed at both ends of the race 2.

Even when the axial edge of the cage 4 and the inner side surface of the folded portion 5 rub against each other in this way, sufficient lubrication oil may be supplied between the rubbed surfaces, but it is conventional. In the case of the structure, the supply of lubricating oil to the relevant portion is likely to be insufficient. That is, the both axial ends of the conventional cage 4 for radial roller bearings are formed in a straight line as shown in FIG.
Therefore, when the cage 4 is displaced in the axial direction, the axial end edge of the cage 4 and the inner side surface of the folded portion 5 come into contact with each other over the entire length (entire circumference) of the axial end edge. .
As a result, it becomes difficult for the lubricating oil to enter the contact portion, and the supply of the lubricating oil between the rubbing surfaces becomes insufficient.

When the supply of the lubricating oil between the rubbing surfaces is insufficient in this way, so-called metal contact occurs in which the metals come into contact with each other without interposing the lubricating oil film on the rubbing surfaces. Damage such as remarkable wear occurs on the inner surface of the. Also in the case of the radial roller bearing in which the race 2 is omitted, the end edge of the retainer 4 rubs against a part of another member such as a collar formed on the outer peripheral surface of the shaft due to the axial load, and this part Damage to. The radial roller bearing retainer of the present invention is invented to prevent damage to the mating surface of the retainer 4 that occurs due to such causes.

[0008]

The cage for radial roller bearings according to the present invention is cylindrical and has rollers that can roll inside thereof, like the cage incorporated in the conventional radial roller bearings described above. There are a plurality of pockets to be held in the circumferential direction.

Particularly, in the radial roller bearing retainer of the present invention, corrugated irregularities are formed at least at one axial edge.

[0010]

In the radial roller bearing retainer of the present invention having the above-described structure, even if the edge and the mating surface rub against each other due to displacement in the axial direction, a sufficient amount can be obtained on the rubbing surface. Can take in the lubricating oil of. That is, the lubricating oil that has entered the concave portion of the corrugated concavo-convex is taken into the rubbing surface between the convex portion of the concavo-convex and the mating surface as the edge rotates relative to the mating surface. Therefore, metal contact between the edge and the mating surface is eliminated, and damage to the mating surface can be prevented. Further, since the plurality of concave portions forming the above-mentioned unevenness also have a function of making it easier for the lubricating oil to flow between the inner diameter side and the outer diameter side of the cage, the lubricity of the rotation supporting portion incorporating the radial roller bearing is also improved. To do.

[0011]

FIG. 1 shows a first embodiment of the present invention. The cage 4a of the present invention is made of a metal plate such as a stainless steel plate in a cylindrical shape like the cage that constitutes the previously known radial roller bearing 1 (FIGS. 3 to 4).
A plurality of pockets 6, 6 for rotatably holding the rollers are provided inside each of them in a circumferential direction at equal intervals. Particularly, in the cage 4a of the present embodiment, corrugated concavities and convexities are formed by alternately connecting arcuate concave portions 8 and 8 and convex portions 9 and 9 at both axial end edges. ing.

In the case of the radial roller bearing retainer of the present invention configured as described above, the retainer 4a is displaced in the axial direction (left and right direction in FIG. 1) based on the axial load, and this retainer is displaced. 4a and the folded-back portions 5 and 5 (FIGS. 3 to 4) formed at both ends of the race 2 (FIGS. 3 to 4).
Even when the other surface such as the inner surface of 4) rubs against the other surface, a sufficient amount of lubricating oil can be taken into the rubbed surface.

That is, when the cage 4a is displaced in the axial direction, among the plurality of recesses 8 and 8 and the projections 9 and 9, the tip end of the projections 9 and 9 and the mating surface are the same. A contact is made, and a gap space is formed between the concave portions 8, 8 and the mating surface. Then, a part of the lubricating oil sent to the rotation supporting portion including the radial roller bearing is converted into the concave portion 8,
8 enters the gap space formed based on the existence of 8. Further, the lubricating oil that has entered this clearance space is accompanied by the relative rotation between the edge and the mating surface, and the convex portion 9 of the irregularities,
It is taken in by the rubbing surface of 9 and the other side. By thus incorporating the lubricating oil into the rubbing surfaces, the strength of the oil film formed between the convex portions 9 and 9 and the mating surface becomes sufficiently large due to the wedge effect. Therefore, metal contact between the edge and the mating surface is eliminated, and damage to the mating surface can be prevented.

Further, a plurality of concave portions 8 forming the above-mentioned unevenness
The gap space formed based on the existence of
Since it also has a function of facilitating the flow of lubricating oil between the inner diameter side and the outer diameter side of a, the lubricity of the rotation supporting portion incorporating the radial roller bearing is also improved.

Next, FIG. 2 shows a second embodiment of the present invention. In this embodiment, the present invention is applied to cages 4a and 4b for forming a double row radial roller bearing. On the other hand, the retainer 4a (on the left side in FIG. 2) has concave portions 8 and 8 and convex portions 9 and 9 at both end edges thereof, as in the case of the first embodiment described above.
To form a corrugated unevenness. However, the other retainer 4b (on the right side in FIG. 2) has recesses 8 and 8 and protrusions 9 only on the edge on the opposite side (on the right side in FIG. 2) of the one retainer 4a.
9 and 9 are formed.

In the case of this embodiment, when both cages 4a and 4b are displaced in the axial direction by the axial load, the opposite edges of both cages 4a and 4b rub against each other. Then, a sufficient amount of lubrication is fed into the rubbing surface based on the unevenness formed on the end edge of the one cage 4a, and the edge of each cage 4a, 4b is prevented from being damaged. .

If both the opposite edges of the pair of cages 4a and 4b are formed with concavities and convexities, the concavities and convexities mesh with each other, and these cages 4a and 4b restrain rotational movements from each other. , Not preferable. By flattening one of the opposing edges as in the present embodiment, the two retainers 4a and 4b do not restrain the rotational movement from each other even when the edges contact each other, and the radial movement is prevented. Roller bearings rotate smoothly.

[0018]

The cage for radial roller bearings of the present invention comprises:
Since it is configured and operates as described above, the edge of the cage does not damage the opposing surface such as scratches,
It is possible to improve the durability of the rotation support part incorporating the radial roller bearing.

[Brief description of drawings]

FIG. 1 is a schematic side view of a cage showing a first embodiment of the present invention.

FIG. 2 is a schematic side view showing the second embodiment.

FIG. 3 is a partially cutaway perspective view of a radial roller bearing.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a schematic side view of a conventional cage.

[Explanation of symbols]

 1 Radial roller bearing 2 Race 3 Roller 4, 4a, 4b Cage 5 Folding part 6 Pocket 7 Step part 8 Recessed part 9 Convex part

Claims (1)

[Claims] 1. A radial roller bearing retainer having a plurality of cylindrical pockets, each of which has a roller rotatably held therein, provided circumferentially in at least one axial edge of the cage. A cage for radial roller bearings characterized by having corrugated irregularities.