JP2001208077A - Roller bearing with groove for retaining ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing which is possible to relax the localized stress concentration in an outer ring raceway and a groove for a retaining ring. SOLUTION: This roller bearing with groove for retaining ring comprises the outer ring 2, an inner ring, a plurality of rolling elements 6 and further the groove 8 for the retaining ring on the outer periphery of the outer ring in which two corners 8a and 8b of the bottom face of the groove 8 for retaining ring have curved surfaces wherein, of the corner 8a and 8b, a radius R1 of the corner 8a closer to the outer ring raceway 4 is made equal to 3-15% of the radium of rolling member 6 and a distance MD from the outer ring raceway 4 to the corner 8a is made equal at least not less that 15% of the rolling element 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing having an outer ring having a groove for fitting a retaining ring. More specifically, the present invention relates to improvement of durability near the groove for the retaining ring.

[0002]

2. Description of the Related Art A rolling bearing is provided with a retaining ring groove for fitting an annular retaining ring on the outer peripheral surface of an outer ring of the rolling bearing for the purpose of regulating the axial direction of the bearing. There is something. FIG. 2 shows a longitudinal sectional view of a grooved ball bearing 11 for a retaining ring as an example of such a rolling bearing. The grooved ball bearing 11 for a retaining ring includes an outer ring 12 and an inner ring 13.
And a plurality of balls 16 that are rotatably arranged between the outer ring raceway 14 and the inner ring raceway 15, and a retainer 17 that holds the balls 16 at equal intervals. A groove 18 for a retaining ring is provided on the side.

The grooved ball bearing 11 for the retaining ring
Is used by fitting a retaining ring 19 into a retaining ring groove 18.
The incorporation of the grooved ball bearing 11 for a retaining ring into the device is as follows.
The outer peripheral surface of the outer ring 12 is fitted into a bearing case (bearing housing) in the device (not shown), and the side surface of the outer ring 12 is illustrated with the end surface of the bearing case abutting against the side of the retaining ring 19. The shaft center of the grooved ball bearing 11 for retaining ring is fixed by being pressed by a pressing member that is not formed. And
During operation of the retaining ring grooved ball bearing 11, the inner surface of the retaining ring groove 18 of the outer ring 12 is constantly subjected to repetitive stress accompanying the rolling of the ball 16 while being restricted by the retaining ring 19.

FIG. 3A shows a grooved ball bearing 11 for a retaining ring.
The enlarged view of the vicinity of the retaining ring groove 18 is shown. However, the retaining ring 19 is omitted for simplification. As is clear from FIG. 3 (a), corners 18a,
18b has a curved surface. In the grooved ball bearing 11 for retaining ring, the radius R11 of the corner 18a and the radius R12 of the corner 18b have the same value. Here, the radii R11, R1
2 is 2% of the diameter of the ball 16, and the shortest distance from the outer raceway 14 to the corner 18 a is 15% of the diameter of the ball 16.

[0005]

As described above, repeated stress is applied to the retaining ring groove 18 due to the use of the retaining ring grooved ball bearing 18 as described above. In particular, between the corner 18a and the outer ring raceway 14, there is a mutual positional relationship between them, a reason for the partial thinning of the outer ring 12 due to the presence of the retaining ring groove 18, and a sudden change in the member shape due to the presence of the corner 18a. Therefore, stress concentration tends to occur. For this reason, when an excessive external impact or load is applied, the stress concentration is excessively advanced, and the possibility of bearing damage is undesirably increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grooved rolling bearing for a retaining ring which can reduce stress concentration.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide an outer race, an inner race, and a plurality of rolling elements arranged to be rotatable between an outer raceway present on the outer race and an inner raceway present on the inner race. A moving body, wherein the outer ring has a groove for a retaining ring in an outer peripheral portion, and two corners of a bottom portion of the groove for the retaining ring are rolling bearings with a groove for a retaining ring formed of a curved surface; The radius of the corner closer to the outer raceway is 3 to 15% of the diameter of the rolling element, and the distance from the outer raceway to the corner is at least 15% or more of the diameter of the rolling element. This is achieved by providing a featured grooved rolling bearing for a retaining ring.

According to the above configuration of the present invention, the radius of the corner on the side where stress concentration is likely to occur among the curved corners at the bottom of the groove for the retaining ring is 3 to 15% of the diameter of the rolling element. Since the distance between the outer ring raceway and the corner is at least 15% or more of the diameter of the rolling element, the radius of the corner is larger than that of a conventional rolling bearing. Stress concentration is reduced.

[0009]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view (a portion near a ball) of a grooved ball bearing 1 for a retaining ring according to an embodiment of the present invention.

The grooved ball bearing 1 for a retaining ring has an outer ring 2 fixed to a housing via a retaining ring, an inner ring (not shown) for supporting a shaft and the like, and an outer ring raceway existing in the outer ring 2. 4 and a plurality of balls 6 rotatably disposed between inner raceways existing in the inner race, and a retainer 7 for holding the plurality of balls 6 at equal intervals. Further, the outer ring 2 has a groove 8 for a retaining ring having a U-shaped cross section on the outer peripheral portion, and the corners 8a and 8b of the bottom portion of the groove 8 for the retaining ring are curved surfaces.

A characteristic feature of the present invention is that a radius R1 and a corner 8b of the corner 8a are the same in the conventional type.
Are different from each other, and the radius R1 of the corner 8a closer to the outer raceway 4 is 3 to 15% of the diameter of the ball 6. Further, the shortest distance MD from the outer raceway 4 to the corner 8 a is 15% or more of the diameter of the ball 6. In addition,
In the present embodiment, the radius R2 of the corner 8b is the same as the radius R12 of the conventional ball bearing 11 with a groove for a retaining ring. However, the radius R2 can be appropriately changed.

Ball bearing 1 with retaining ring having the above structure
Is the radius R of the corner 8a on the side of the corners 8a and 8b on which the force due to the rolling of the ball 6 is directly transmitted and the stress concentration is likely to occur.
1 is, according to the invention, 3-15% of the diameter of the ball 6, and the distance between the outer raceway 4 and the corner 18a is at least 15% or more of the diameter of the ball 6. . That is, since the radius of the curved surface is larger than that of the conventional ball bearing with a groove for a retaining ring in which the radius of the corner is set to 2%, stress concentration on the corner 18a is reduced.

If the radius R1 of the corner 8a is less than 3% of the diameter of the ball 6, an excessive external impact or excessive load, which occurs in a conventional ball bearing with a groove for a retaining ring, causes an excessively large impact. Stress concentration occurs. On the other hand, if the radius R1 of the corner 18a exceeds 15% of the radius of the ball 6, it seems at first glance that it is preferable from the viewpoint of relaxation of stress concentration. As a result, the bearing is not securely fixed, which is not suitable. Therefore, as described above, the radius R1 of the corner 8a is 3% to 15% of the diameter of the ball.
It is found that it is appropriate to be within the range of%.

Note that the present invention is not limited to the above-described embodiment, but can be appropriately modified. For example, the present invention can be applied to ball bearings other than the single-row deep groove ball bearing described in the above embodiment, for example, a magneto ball bearing and other roller bearings.

[0015]

As described above, in the rolling bearing with a groove for a retaining ring of the present invention, of the two corners present at the bottom of the groove for the retaining ring, the radius of the corner closer to the outer ring raceway has the aforementioned radius. Since it is 3 to 15% of the diameter of the rolling element and the distance from the outer ring raceway to the corner is at least 15% or more of the diameter of the rolling element, compared with the conventional rolling bearing with a groove for a retaining ring. Stress concentration can be reduced.

[Brief description of the drawings]

FIG. 1 is a part of a longitudinal sectional view of a grooved ball bearing for a retaining ring, which is an embodiment of the present invention.

FIG. 2 is a part of a longitudinal sectional view of a conventional grooved ball bearing for a retaining ring.

FIG. 3 is an enlarged view of the vicinity of the retaining ring groove of the ball bearing with a retaining ring groove of FIG. 2;

[Explanation of symbols]

 1,11 Ball bearing with groove for retaining ring 2,12 Outer ring 13 Inner ring 4,14 Outer raceway 15 Inner raceway 6,16 Ball 7,17 Cage 8,18 Retaining ring groove 8a 8b Corner of groove

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideki Miyauchi 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3J101 AA02 AA12 AA32 AA42 AA54 AA62 BA54 BA56 FA60

Claims (1)

[Claims] 1. An outer race, an inner race, and a plurality of rolling elements disposed so as to freely roll between an outer raceway present on the outer race and an inner raceway present on the inner race, wherein the outer race is provided on an outer peripheral portion. In a rolling bearing with a retaining ring groove having a groove for a retaining ring and two corners of a bottom portion of the groove for the retaining ring having a curved surface, of the corners, a radius of a corner closer to the outer ring raceway is: A grooved rolling bearing for a retaining ring, wherein the diameter is 3 to 15% of the diameter of the rolling element, and the distance from the outer raceway to the corner is at least 15% or more of the diameter of the rolling element.