JPH1037967A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely maintain creep preventing effect without respect to a temperature fluctuation by means of easy constitution at a low cost by forming the outer circumferential face of an outer ring into a center recessed shape in which the part corresponding to the outer ring raceway track serves as a bottom part. SOLUTION: An outer circumferential face 1a of an outer ring 1 is formed into a center recessed shape in which a part corresponding to an outer ring raceway track 15 serves as a bottom part. The center recessed shape is formed of a circular arc face, which is provided with a radius of curvature R, crosses the axial line X-X orthogonally, and is provided with a curvature center O1 on the radius direction line Y-Y passing through the bearing center O. In this way, an outer ring outer circumferential face part 9 on the radius directional line Y-Y serves as the lowermost part in the circular arc face, and outer ring outer circumferential face parts 10, 11 matching with circumferential grooves 12, 13 serve as rising parts of the circular arc face. When the outer ring 1 is fitted in a fitting hole 14a in a housing 14, the outer circumferential face parts 10, 11 are force fitted with interference, as the outer circumferential face 1a is formed into the center recessed shape. In this way, structure can be simplified, a cost is lowered, and creep preventing effect can be surely maintained without respect to a temperature fluctuation of the peripheral environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed rolling bearing capable of preventing creep.

[0002]

2. Description of the Related Art Various types of rolling bearings have been proposed to prevent creep. For example, the circumferential groove formed on the outer peripheral surface of the outer ring is filled with a synthetic resin so as to partially protrude toward the outer diameter side, and the synthetic resin is pressed into a rolling bearing fitting member to prevent the bearing from creeping. 2. Description of the Related Art There are known a bearing and a rolling bearing in which a non-rotating washer is attached to an outer peripheral surface of an outer ring to prevent creep of the outer ring with respect to an outer ring fitting member via the washer.

[0003]

However, the construction of each of the above-mentioned rolling bearings requires a separate part for preventing creep, which increases the cost. Further, in a configuration using a synthetic resin, if the material selection of the synthetic resin is not taken into consideration, a sufficient frictional force between the synthetic resin and the bearing fitting member may not be obtained due to a change in the ambient temperature. Further, in the configuration using the non-rotating washer, a device is required for attaching the washer to the outer ring, and the structure is likely to be complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing which has a simple structure, is inexpensive, and can reliably maintain the creep preventing effect even when the ambient temperature changes.

[0005]

According to a first aspect of the present invention, there is provided an inner ring, an outer ring, a rolling element disposed between the inner and outer rings, and an inner ring fixed to peripheral grooves on both inner peripheral surfaces of both ends of the outer ring. In a rolling bearing having a sealing member forming a sealing portion therebetween, the outer peripheral surface of the outer ring is formed in a concave shape in which a corresponding portion of the outer ring raceway is a bottom portion.

According to a second aspect of the present invention, in the rolling bearing according to the first aspect, the concave shape of the outer peripheral surface of the outer ring is formed by an arc surface having a center of curvature on a radial line passing through the bearing center orthogonal to the axis. It is characterized by having been done.

According to a third aspect of the present invention, in the rolling bearing according to the second aspect, the circular arc surface of the outer peripheral surface of the outer ring is
The outer ring outer peripheral surface is formed so as to be in contact with the bearing fitting member on the entire surface when fitted to the bearing fitting member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment according to the present invention, in which an inner ring 2, an outer ring 1,
The ball (rolling element) 3 is disposed between the inner and outer rings 2 and 1 and held by a retainer 4, and sealing members 5 and 6 are disposed at both ends of the outer ring 1 and seal the inside of the bearing. The sealing members 5, 6
The outer peripheral portions 5a, 6a are fitted and fixed in peripheral grooves 12, 13 formed on the inner peripheral surfaces of both ends of the outer race 1, respectively, and the inner peripheral lip portions 5b, 6b of the sealing members 5, 6 are respectively fitted to the inner race 2 A sealing portion is formed between the peripheral grooves 7 and 8.

The outer peripheral surface 1a of the outer race 1 is
Is formed in a concave shape that becomes the bottom. That is, the outer peripheral surface 1a of the outer ring 1a is larger than the outer peripheral surface 1a of the portion corresponding to the outer raceway 15 so that the diameter of the outer peripheral surface 1a corresponding to the peripheral grooves 12, 13 to which the sealing members 5, 6 are fixed is larger. It is formed in a concave shape.

The concave shape of the outer ring outer peripheral surface 1a is as follows.
Specifically, it is formed by an arc surface having a radius of curvature R having a center of curvature O1 on a radial line YY passing through a bearing center O orthogonal to the axis XX. Thereby, the radial line Y
The outer ring outer peripheral surface portion 9 on −Y is the lowest portion of the circular arc surface, and the outer ring outer peripheral surface portions 10 and 11 corresponding to the peripheral grooves 12 and 13 are cut-out portions of the circular arc surface. In addition, the outer ring outer peripheral surface portion 1 corresponding to the peripheral grooves 12, 13 to which the sealing members 5, 6 are fixed.
The shape is not limited to the above-mentioned arc-shaped surface as long as it is a concave shape having a large diameter of 0, 11;

Further, when the arc surface of the outer ring outer peripheral surface 1a is fitted to a housing (bearing fitting member) 14 described later, the outer ring outer peripheral surface 1a contacts the inner surface of the fitting hole of the housing 14 over the entire surface. With such a configuration, creep prevention of the outer race is more reliably achieved.

Next, a description will be given of a state where the outer race 1 is fitted to the housing 14. In FIG. 2, when the outer ring 1 is fitted into the fitting hole 14a of the housing 14, the outer ring outer peripheral surface 1a
Are concave, the outer peripheral surface portions 10 and 11 at both ends of the outer ring 1 are press-fitted with interference. At this time, if the concave shape is an arcuate surface shape such that the entire concave surface contacts the inner surface of the fitting hole 14a of the housing 14, the outer ring outer peripheral surface 1
The interference on the entire surface of a is obtained, and a more reliable creep preventing action is obtained.

As described above, in the present invention, when the housing 14 is made of a light alloy such as an aluminum alloy, for example, even if the housing 14 expands due to a change in the temperature of the surrounding environment, both ends 10 of the outer race 1 are formed. , 11 do not cause the outer ring 1 to creep. Furthermore, the places where the interference is large are the positions of the sealing members 5 and 6 at both ends of the outer ring, so that there is almost no effect on the outer ring raceway 15 and the bearing raceway section does not have a negative clearance. Furthermore, since the outer ring 1 is easily deformed at the time of press-fitting the outer ring in the circumferential grooves 12 and 13 located at both ends of the outer ring 1 to which the sealing members 5 and 6 are fixed, the press-fitting into the housing 14 is easy. This ease of press-fitting can be obtained by changing the depth of the circumferential grooves 12, 13 and the shapes of the chan- ger 16, 16 at both ends of the outer peripheral surface 1a.

[0014]

According to the present invention, the structure is simple and the cost is low, and the effect of preventing creep even when the ambient temperature changes is reliably maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bearing according to an embodiment of the present invention.

FIG. 2 is an assembled state diagram of an outer ring and a housing of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 1a Outer peripheral surface 2 Inner ring 3 Ball 5,6 Sealing member

Claims (3)

[Claims] 1. A rolling device having an inner ring, an outer ring, a rolling element disposed between the inner and outer rings, and a sealing member fixed to a circumferential groove on both inner circumferential surfaces of both ends of the outer ring to form a sealing portion between the inner ring and the inner ring. A rolling bearing, wherein the outer peripheral surface of the outer ring is formed in a concave shape in which a corresponding portion of the outer ring raceway has a bottom portion. 2. The center concave shape of the outer ring outer peripheral surface is formed by an arc surface having a center of curvature on a radial line passing through a bearing center perpendicular to the axis.
The rolling bearing according to the above. 3. An outer peripheral surface of the outer ring is formed so that an arc surface of the outer peripheral surface is in contact with the bearing fitting member over the entire surface when the outer ring is fitted to the bearing fitting member. Item 3. The rolling bearing according to item 2.