JP2002327755A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing such as a self-aligning roller bearing capable of improving a lubricating property of the side face of a roller. SOLUTION: In the roller bearing in which a retainer 4 is arranged in a comb-shape, a ring-shaped recessed portion 13 is arranged at a bottom surface 12a of each pocket 12 of the retainer 4. The ring-shaped recessed portion 13 has a shape forming a part of a pocket ring-shape. Both ends of the recessed portion 13 is opened to the outside diameter surface of the retainer 4, and the middle portion of the recessed portion has a shape opened to the inside diameter surface of the retainer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing such as a self-aligning roller bearing in which rollers are held by a comb-shaped retainer.

[0002]

2. Description of the Related Art FIG. 9 shows a main part of a retainer mounted on a conventional roller bearing of this kind. The retainer 24 has a plurality of pillars 26 protruding in a comb shape on one side of a ring-shaped part 25,
Pocket 2 for holding rollers between adjacent pillars 26,26
7. FIG. 9A is an enlarged view of a main part of the retainer 24 cut in the radial direction, and FIG.
FIG. 2A is a cross-sectional view taken along the line aa in FIG.

[0003]

However, in the cage 24 having the above-described structure, the bottom surface 27a of the pocket 27 for receiving the roller end surface is flat, and the roller end surface contacts the pocket bottom surface 27a with a large contact area. Contact. Therefore, it is difficult for the injected lubricating oil to sufficiently spread to the inner ring middle flange for guiding the roller end faces and the roller end face contact portions of the guide wheels, and it is difficult to obtain sufficient lubrication of the roller end faces.

An object of the present invention is to solve such a problem and to provide a roller bearing capable of improving the lubricity of a roller end face.

[0005]

According to the bearing of the present invention, a plurality of rollers held by a retainer are interposed between inner and outer races, and the retainer is opened on one width surface and inner and outer diameter surfaces. In a roller bearing, which is a comb-shaped cage in which a plurality of pockets each holding a roller are arranged in a circumferential direction, an annular concave portion is provided on a bottom surface of each pocket of the cage. According to this configuration, the annular concave portion provided on the bottom surface of the pocket serves as a passage for the lubricating oil between the end face of the roller and the flange of the race or the guide wheel. For this reason, a sufficient oil film can be formed on the contact surface between the end face of the roller and the flange of the raceway, the guide wheel, or the like, and the lubricity is improved.

In the present invention, the annular recess is
The shape may form a part of a ring, and both ends may be opened on the outer diameter surface of the cage, and the middle portion may be opened on the inner diameter surface of the cage. With this configuration, the lubricating oil supplied to the bottom surface of the cage pocket passes through the annular concave portion,
The lubrication of the roller end surface is further improved because the roller extends over the inner diameter side and the outer diameter side of the cage.

In the present invention, the roller bearing may be a self-aligning roller bearing. In the case of the self-aligning roller bearing, the contact pressure between the roller end surface and the contact surface between the raceway ring flange surface and the guide wheel tends to be high due to its alignment. Therefore, high lubricity is required for the roller end faces, and the effect of improving the lubricity by the formation of the above-described annular concave portion becomes even more effective.

In the present invention, an inner ring, an intermediate wheel located on the outer periphery of the inner ring, and an outer ring located on the outer periphery of the intermediate wheel are provided as the above-mentioned raceway rings. Rollers held by the retainers may be interposed between the ring and the outer ring. In the case of such a triple race bearing, if a hole or the like is provided in the race to enhance lubrication, the lubrication path becomes complicated, but in the present invention, an annular concave portion is provided on the bottom surface of the pocket of the cage. Therefore, lubrication can be improved with a simple configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in the cross-sectional view of FIG. 1, this bearing includes an inner ring 1, an intermediate ring 2 located on the outer periphery of the inner ring 1, and an outer ring 3 located on the outer periphery of the intermediate ring 2, as the race rings. A triple race type self-aligning roller bearing having a plurality of rollers 5 held by a retainer 4 between the inner ring 1 and the intermediate wheel 2 and between the intermediate wheel 2 and the outer ring 3. is there.

As shown in FIG. 3, the inner ring 1 has flanges 1a at both ends on the outer periphery and does not have a middle flange, and a double row of raceway surfaces 1b, 1b formed on the outer diameter surface is formed. The axes of the rollers 5, 5 in both rows are set so as to be inclined in opposite directions. A plurality of oil holes 6 penetrating in the radial direction are provided in the middle part in the width direction of the inner ring 1 so as to be arranged in the circumferential direction. FIG.
In the outer ring 3, the raceway surface 3a has a spherical shape over the entire width. A plurality of oil holes 7 penetrating in the radial direction are also provided at the intermediate portion in the width direction of the outer ring 3 so as to be arranged in the circumferential direction. As shown in FIG. 2, the intermediate wheel 2 has a flange 2a at both ends on the outer periphery and a middle flange 2c, and a spherical raceway surface 2b is formed on the inner diameter surface over the entire width. On the outer diameter surface of the intermediate wheel 2, double rows of raceway surfaces 2d, 2d are formed. These two raceway surfaces 2d are also set such that the axes of the rollers 5, 5 in both rows are inclined in opposite directions. As shown in FIG. 1, a double-row raceway surface 1 in an inner ring 1 and an intermediate wheel 2
b and 2d are opposing spherical orbital surfaces 2b and 3 respectively.
The curved surface has an arc-shaped cross section corresponding to a. The rollers 5 in each row have a peripheral surface bulging in an arc shape in cross section. Each roller 5 has a hollow hole 8 at an axial center portion penetrating in the axial direction, and is hollow. The inner ring 1 and the intermediate wheel 2
Have a surface hardness of HR C = 58-64 and HS = 78-88.
It has been. The surface hardness of the outer ring 3 is HR C = 57-6.
4, HS = 76-88.

The cage 4 is provided integrally with a row of rollers 5 provided in a double row between the inner ring 1 and the intermediate wheel 2,
Each row of the rollers 5 provided in a double row between the intermediate wheel 2 and the outer ring 3 is provided individually. The above integrated retainer 4
Is a comb type in which a plurality of pockets 12 which are opened on both width surfaces and inner and outer diameter surfaces of the ring body 11 and hold the rollers 5 are arranged in the circumferential direction. Individual cage 4 above
Is a comb-shaped one in which a plurality of pockets 12 which are opened on one width surface and inner and outer diameter surfaces of the ring body 11 and hold the rollers 5 are arranged in the circumferential direction. The above-mentioned integrated cage 4 and individual cages 4 have the same configuration as each other, except for matters specifically described.

As shown in FIG. 5, the pocket 12 has a circular arc shape along the outer diameter surface of the roller 5 when viewed from the width surface side where the pocket 12 opens. As shown in FIG. 7, an annular concave portion 13 is formed on the bottom surface 12a of the pocket 12. This annular concave portion 13 has its arc center P
(FIG. 7 (C)) is biased toward the outer diameter side from the center of the radial thickness of the retainer 4 and forms a part of a ring. Both ends of the annular concave portion 13 open on the outer diameter surface of the retainer 4, and the intermediate portion opens on the inner diameter surface of the retainer 4.
The arc center P of the recess 13 is located at the center with respect to the pocket width. As for the pocket 12, the center of the arc on the side surface is deviated toward the inner diameter side, and the opening width on the inner diameter side is wider than the opening width on the outer diameter side. And is on the opposite side to the direction of deviation of the arc center of the pocket 12. On the bottom surface of the pocket 12, a circular central concave portion 17 is formed at an arc center P of the annular concave portion 13. The arc center P of the annular concave portion 13 may be located on the outer diameter side of the outer diameter surface of the retainer 4 as shown in FIG. In particular, in the case of the retainer 4 between the inner ring 1 and the intermediate wheel 2, it is easy to design such that the retainer 4 is disposed on the outer diameter side of the retainer outer diameter surface. A broken line C in the figure indicates a pocket hole diameter.

The ring body 11 of the integrated retainer 4 includes:
A plurality of radial oil holes 14 (FIG. 6) are provided in the circumferential direction. The individual retainer 4 does not have the oil hole 14 but may be provided.

According to this configuration, the bottom surface 1 of the pocket 12
An annular concave portion 13 provided in 2a serves as a passage for lubricating oil between the end face of the roller 5 and the middle flange 2c of the intermediate wheel 2. Therefore, a sufficient oil film can be formed on the contact surface between the end face of the roller 5 and the middle flange 2c and the like, and lubricity is improved. For example, the lubricating oil injected from the oil holes 6 and 7 of the inner and outer rings 1 and 3 is filled with the annular recess 13 on the pocket bottom surface 12 a of the cage 4.
Through the intermediate wheel middle flange 2c that guides the end surface of the roller 5 to the contact surface with the roller 5. In this example, the inner ring 1 does not have a middle flange. However, even when the inner ring 1 has a middle flange, lubricating oil can be sufficiently spread over the contact surface with the rollers 5 of the middle flange. The same applies when a guide wheel is provided instead of the middle collar. Since the concave portion 13 is annular, an effect of retaining lubricating oil in the concave portion 13 also occurs as compared with a case where the concave portion 13 is provided linearly, and thereby the lubricity of the end face of the roller 5 is improved. Further, the annular recess 13 in the retainer 4
Has a shape that forms a part of a ring, and has both ends opened to the outer diameter surface of the retainer 4 and an intermediate portion opened to the inner diameter surface of the retainer 4. The lubricating oil supplied to the bottom surface 12a passes through the annular
It becomes easy to spread to the inner diameter side and the outer diameter side of. for that reason,
The lubricity of the roller end face is further improved. This embodiment is
Although the triple race bearing has the inner ring 1, the intermediate ring 2, and the outer ring 3, the annular race 13 is provided on the pocket bottom surface 12a of the retainer 4 to cope with the problem. The lubricating property can be improved by the configuration.

FIG. 8 shows a roller bearing according to another embodiment. This embodiment shows an example applied to a self-aligning roller bearing having two general races. Rollers 5 and 5 are interposed between the inner ring 1 and the outer ring 3 in double rows. The rollers 5 in each row are held by the holder 4. In this example, the inner ring 1 is
c, and has flanges 1a at both ends. The raceway surface 3a of the outer ring 3 is spherical, and each raceway surface 1b of the inner ring 1
Is an arc-shaped curved surface shape corresponding to the spherical shape of the outer raceway surface 3a. The rollers 5 are of the same barrel type as in the above embodiment. The retainer 4 has the same configuration as the retainer 4 used in the above embodiment. In the case of the bearing having this configuration, the annular concave portion 13 provided on the bottom surface of the pocket 12 is also used.
However, the lubricating oil passes between the end face of the roller and the middle collar 1c of the inner ring 1, and the lubricity of the roller end face is improved.

In each of the above embodiments, a case where the present invention is applied to a self-aligning roller bearing has been described. However, the present invention can be applied to a general roller bearing using a comb-shaped retainer. It can also be applied to roller bearings.

[0017]

According to the bearing of the present invention, in the roller bearing using the comb-type cage, an annular concave portion is provided on the bottom surface of each pocket of the retainer. This concave portion is formed between the end face of the roller and the raceway. It becomes a passage for lubricating oil between the flange and the guide wheel, etc., and a sufficient oil film can be formed on the contact surface between the roller end surface and the flange of the raceway, the guide wheel, etc., and the lubricity of the roller end surface improves. .
In the case where the above annular concave portion has a shape that forms a part of the annular shape, and both ends are opened on the outer diameter surface of the retainer, and the intermediate portion is opened on the inner diameter surface of the retainer, the lubricating oil is as follows. Getting better,
The lubricity of the roller end face is further improved. When the present invention is applied to a self-aligning roller bearing, an annular concave portion is provided for a high contact pressure generated on a contact surface between a roller end face and a raceway ring flange surface or a guide wheel due to its aligning property. The effect of improving lubricity works effectively. In addition, when the present invention is applied to a triple race bearing having an inner ring, an intermediate ring, and an outer ring as a bearing ring, it has an annular ring on the bottom surface of the cage without forming a complicated lubrication path while having three bearing rings. The lubricating property can be improved with a simple configuration in which only the concave portion is provided.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an intermediate wheel in the roller bearing.

FIG. 3 is a sectional view of an inner ring of the roller bearing.

FIG. 4 is a sectional view of a cage in the roller bearing.

FIG. 5 is a side view of the retainer.

FIG. 6 is an enlarged sectional view of a main part of the retainer.

7A is an enlarged sectional view of a main part of a cage used for the roller bearing, FIG. 7B is a sectional view taken along line bb in FIG. 7A, and FIG. FIG. 7D is an explanatory diagram of the pocket bottom surface of the cage as viewed, and FIG. 8D is an explanatory diagram of the pocket bottom surface in a modified example of the cage.

FIG. 8 is a cross-sectional view of a roller bearing according to another embodiment of the present invention.

9A is an enlarged cross-sectional view of a main part of a cage in a conventional roller bearing, and FIG. 9B is a cross-sectional view taken along a line aa in FIG. 9A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner ring (track ring) 2 ... Intermediate wheel (track ring) 3 ... Outer ring (track ring) 4 ... Retainer 5 ... Roller 12 ... Pocket 12a ... Pocket bottom surface 13 ... Annular concave part

Claims (4)

[Claims] 1. A plurality of rollers held by a retainer are interposed between inner and outer races, and a plurality of pockets which open the retainer on one width surface and inner and outer diameter surfaces to retain the rollers are provided. A roller bearing comprising comb-shaped cages arranged in a circumferential direction, wherein an annular concave portion is provided on the bottom surface of each pocket of the cage. 2. The annular concave portion has a shape that forms a part of an annular shape, and has both ends opened to the outer diameter surface of the retainer and an intermediate portion opened to the inner diameter surface of the retainer. The roller bearing according to claim 1. 3. The roller bearing according to claim 1, wherein the roller bearing is a self-aligning roller bearing. 4. An inner ring, an intermediate wheel located on the outer periphery of the inner ring, and an outer ring located on the outer periphery of the intermediate wheel are provided as the orbital rings, and between the inner ring and the intermediate wheel, and 4. The roller bearing according to claim 3, wherein rollers held by the cage are interposed between the outer ring and the outer ring.