JP2005106252A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing capable of reducing manufacturing costs and securing lubricating performance. <P>SOLUTION: In the roller bearing, a retainer 3 includes ring portions 8 and 9 on both sides of its pocket 7, and step portions 10 and 11 being elastically deformable at a diameter slightly greater than an inner diameter of rib portions 5 and 6 of the outer ring 1 are formed at a near section of both rib portions 5 and 6 of an outer ring 1. External end ranges of the ring portions 8 and 9 at an axial direction are disposed inward the rib portions 5 and 6 at a radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in a roller bearing in which an outer ring having flanges at both end edges of a raceway and a plurality of rollers capable of rolling the raceway part of the outer ring are integrally incorporated by a cage.

Various types of roller bearings have been proposed in which an outer ring having flanges at both end edges of the raceway and a plurality of rollers that can freely roll the raceway part of the outer race are integrated by a cage (for example, patents) Reference 1). As the outer ring of such a roller bearing, there are a type in which the shape of the flange of the outer ring is bent at a substantially right angle with respect to the outer ring raceway part, and a type in which the outer ring is bent so as to overlap the outer ring raceway part.
Shoko 52-30427

  In the former type in which the shape of the outer ring collar is bent at a right angle to the outer ring raceway part, one of the collars is bent, and this assembly is assembled from the other to the outer ring with the roller held in a cage. After that, the other hook is bent so that the outer ring, the rollers and the cage are not separated. However, in this case, a process of post-bending the other scissors is necessary, which increases the manufacturing cost.

  On the other hand, in the latter type in which the outer ring collar is overlapped with the outer ring raceway part, the collars on both sides are bent in advance, the cage is assembled in the outer ring, and the rollers are inserted from the radially inner side of the cage. Since it fits, post-bending processing as described above becomes unnecessary. However, in this case, since both ends of the roller are arranged so as to come into contact with the end surface of the flange, a space for holding a lubricant (for example, grease) becomes scarce.

  The roller bearing of the present invention is a roller bearing in which a cage for holding a roller is incorporated into an outer ring having radially inward flange portions on both axial sides, and is provided at both axial ends of the cage. A step portion having an outer diameter larger than the inner diameter of the portion and capable of elastically compressing at least a difference between the inner diameter and the outer diameter radially inward, and the retainer elastically compresses the step portion. The roller is mounted on the outer ring after being elastically restored after getting over the part, and the roller is built in from the radially inner side with respect to the pocket of the cage, and the inner diameter surface of the outer ring, the axial inner side surface of the flange part, and the step The space surrounded by the part outer diameter surface is a lubricant holding space.

  According to the present invention, it is possible to reduce the heat treatment process for forming the collar part, for example, the tempering process, so that the manufacturing cost of the roller bearing can be reduced, and in addition, the lubricant can be held with the outer ring cage incorporated. Since a space can be secured, good lubricity can be maintained over a long period of time by a lubricant, for example, grease, held in this space.

  According to the roller bearing of the present invention, the manufacturing cost can be reduced and a predetermined lubricating performance can be ensured.

  Hereinafter, the best mode roller bearing according to the present invention will be described with reference to the drawings. FIG. 1 is an overall cross-sectional view of a roller bearing, FIG. 2 is a single perspective view of a cage, and FIG. 3 is a cross-sectional view showing a state in which the cage is mounted on an outer ring.

  In these drawings, 1 is an outer ring, 2 is a needle roller, and 3 is a cage. The roller bearing A is constituted by the outer ring 1, the needle roller 2, and the cage 3. The outer ring 1 has flange portions 5 and 6 that are bent radially inward on one side and the other side of the track portion 4.

  The cage 3 is made of metal and formed in an annular shape, and pockets 7 for roller mounting are formed at equal intervals in the circumferential direction. The cage 6 includes annular portions 8 and 9 on both outer sides in the width direction of the pocket 7. Annular step portions 10 and 11 are formed at the axial center portions of the annular portions 8 and 9, and both axial sides of the step portions 10 and 11 are flat portions 16 and 17. The step portions 10 and 11 include an axially inclined portion 12, an axially inclined portion 13, and a flat portion 15 sandwiched between the inclined portions 12 and 13 from both sides in the axial direction. The outer diameter D1 of the flat surface portion 15 is slightly larger than the inner diameter D2 of the flange portions 5 and 6 of the outer ring 1. Since the stepped portions 10 and 11 have the above-described configuration, they can be elastically compressed inward in the radial direction by at least a difference between both diameters D1 and D2.

  The width (axial length) B1 of the cage 3 is smaller than the width B2 of the outer ring 1, that is, the width B2 between the axially outer surfaces of the flange portions 5 and 6, and the axial directions of the flange portions 5 and 6 It is formed larger than the width B4 between the inner side surfaces. In the stepped portions 10 and 11 of the cage 3, the width B3 between the minimum outer diameters of the both axially inclined portions 12 and 12 is set to be approximately equal to the width B4 between the axially inner surfaces of the flange portions 5 and 6. Is set slightly smaller. The axial width of the flat portions 16 and 16 on the inner side in the axial direction of the annular portions 8 and 9 is L1, and thereby, between the pocket 7 and the inclined portions 13 and 13 on the inner side in the axial direction of the step portions 10 and 11, They are spaced apart in the axial direction by a width L1. The outer diameter D3 of the flat portion 17 on the outer side in the axial direction of the annular portions 8 and 9 is set slightly smaller than the inner diameter D2 of the flange portions 5 and 6. C shows a lubricant holding space formed by assembly described later and surrounded by the inner diameter surface of the outer ring 1, the axial inner side surfaces of the flange portions 5 and 6, and the outer diameter surfaces of the step portions 10 and 11.

  An assembling procedure in the roller bearing A having the above configuration will be described. First, the outer ring 1 is bent at both sides in the radial direction to form flanges 5 and 6 and subjected to heat treatment to give a predetermined hardness. The cage 3 has step portions 10 and 11 formed on both sides in advance by press molding.

  Such a cage 3 is assembled from the opening on one side in the width direction of the outer ring 1. At this time, the outer diameter D1 of the flat surface portion 15 is slightly larger than the inner diameter D2 of the flange portion 5 of the outer ring 1, so that it resists the elasticity of the annular portion 8 of the cage 3 in the axial direction. When pressed (forcibly fitted), the inclined surface 12a of the inclined portion 12 on the outer side in the axial direction of the step portion 10 formed in the annular portion 8 is pressed against the inner diameter surface 5a of the flange portion 5, and as shown by the phantom line in FIG. The diameter of the portion 10 is reduced, the outer diameter surface 15a of the flat surface portion 15 gets over the inner diameter surface 5a of the flange portion 5, a part of the cage 3 enters the outer ring 1, and the stepped portion 10 is elastically restored.

  When the cage 3 is further pressed and moved, the inclined surface 13a of the inclined portion 13 on the inner side in the axial direction of the step portion 11 formed on the other annular portion 9 is pressed by the inner diameter surface 5a of the flange portion 5 so that the diameter is reduced. The outer diameter surface 15 a of the flat portion 15 of the step portion 11 gets over the inner diameter surface 5 a of the flange portion 5, and then the step portion 11 is elastically restored, and the cage 3 is mounted in the outer ring 1.

  And the inclined parts 12 and 12 on the outer side in the axial direction of the step parts 10 and 11 are respectively locked to the corners in the width direction of the flange parts 5 and 6, respectively, so that the cage 3 is prevented from being removed from the outer ring 1. Become. Subsequently, the retainer 3 and the needle rollers 2 are integrally assembled with the outer ring 1 by attaching the needle rollers 2 to the pockets 7 from the inner diameter side of the retainer 3.

  In such a roller bearing A, the inclined portions 12 and 12 of the cage 3 are engaged with the flange portions 5 and 6, respectively, so that the function of the stopper is achieved, and the needle roller 2 is prevented from being removed when the roller bearing A is used. It can be carried out. In this case, the outer ring 1 and the cage 3 do not protrude in the width direction from the outer ring 1 due to their widthwise dimensions.

  According to the roller bearing A, the flanges 5 and 6 on both sides are formed at the time of the assembly, and after the outer ring 1 is heat-treated, the retainer 3 is assembled by force fitting, and then the needle roller 2 is mounted in the pocket 7. Therefore, the conventional roller is manufactured by bending the one side flange 5 and then incorporating the cage 3 fitted with the needle roller 2 into the outer ring 1 and bending the other side flange 6. Compared to the bearing, a part of the manufacturing process can be omitted, for example, the heat treatment process for tempering can be reduced, and the manufacturing cost can be reduced.

  Further, a lubricant holding space C is formed between the inner diameter surface of the outer ring 1, the outer diameter surfaces of the step portions 10 and 11 of the retainer 3, and the inner surfaces in the axial direction of the flange portions 5 and 6. To retain a lubricant such as grease, and supply the lubricant between the raceway portion 2 of the outer ring 1 to obtain a roller bearing A having excellent lubrication performance over a long period of time. Can do. In addition, lubricating oil with high fluidity can be considered as the lubricant, but even in this case, the roller bearing A can be easily retained in the lubricant retaining space C and has excellent lubrication performance.

  The forming material and shape of the cage 3 are not limited to the above embodiment. FIG. 4 shows an example in which the cage 3 is made of resin. In this cage 3, annular step portions 20 and 21 having a substantially trapezoidal cross section projecting radially outward are formed on the outer diameter surfaces of the annular portions 8 and 9 on both sides of the pocket 7.

  The width B5 between the inclined annular surfaces 20a, 21a on the outer side in the width direction of the step portions 20, 21 is formed to be slightly smaller than the width B6 of the flange portions 5, 6. The inclined annular surfaces 20b and 21b on the inner side in the width direction of the pocket 7 and the stepped portions 20 and 21 are spaced apart in the axial direction by a predetermined width dimension L2. The outer diameter D3 of the stepped portions 20 and 21 is slightly larger than the inner diameter D4 of the flange portions 5 and 6. The outer diameter D5 of the annular portions 8 and 9 is formed slightly smaller than the inner diameter D4 of the flange portions 5 and 6.

  In the above configuration, the stepped portions 20 and 21 are reduced in diameter against the elasticity of the cage 3 so as to get over the flange portion 5 and the cage 3 is attached to the outer ring 1, and then the needle roller 2 is fitted to the cage. The three pockets 7 are mounted from the inner diameter side. Even in such a roller bearing A, it is possible to secure a reduction in manufacturing cost and lubrication performance.

  The cage 3 shown in FIG. 5 is made of resin, and is thicker and cylindrical than the ends of the annular portions 8 and 9 in the intermediate region of the cage 3 including a part of the annular portions 8 and 9. A step portion 25 is formed. A pocket 7 is formed in an intermediate region of the step portion 25. Both sides of the step portion 25 in the width direction are inclined annular surfaces 25a and 25a that are reduced in diameter toward the outside in the radial direction. A width B7 between the inclined annular surfaces 25a and 25a is slightly smaller than a width B8 of the flange portions 5 and 6.

  The outer diameter D6 of the step portion 25 is slightly larger than the inner diameter D7 of the flange portions 5 and 6. The outer diameter D8 of the annular portions 8 and 9 is formed slightly smaller than the inner diameter D7 of the flange portions 5 and 6.

  In the above configuration, the retainer 3 is mounted from one side of the outer ring 1 so that the diameter of the step portion 25 is reduced against the elasticity of the retainer 3 so as to get over the flanges 5 and 6, and then the needle rollers 2 are attached. It mounts | wears with the pocket 7 of the holder | retainer 3 from an inner diameter side. Even in such a roller bearing A, it is possible to secure a reduction in manufacturing cost and lubrication performance.

  The cage 3 shown in FIG. 6 is different from the cage 3 shown in FIGS. 1 to 3 in that the cage 3 is formed of resin and the cross-sectional shape of the step portions 10 and 11, and the configuration of the other portions. Are the same. That is, in the cage 3 shown in FIG. 6, a thin portion 30 having a triangular cross section is formed on the inner peripheral portion corresponding to the step portions 10 and 11.

  The retainer 3 is assembled to the outer ring 1 in the same manner as the retainer 3 shown in FIGS. Even in such a roller bearing A, it is possible to secure a reduction in manufacturing cost and lubrication performance.

Sectional view of the best mode roller bearing of the present invention Single unit perspective view of cage Sectional view when attaching the cage to the outer ring Cross-sectional view of a roller bearing showing another form Sectional view of a roller bearing showing yet another form Sectional view of a roller bearing showing yet another form

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Needle roller 3 Cage 5,6 Gutter part 7 Pocket 8,9 Ring part 10,11 Step part 12,13 Inclination part 15 Plane part C Lubricant holding space

Claims (1)

A roller bearing that incorporates a cage for holding a roller against an outer ring having radially inward flanges on both axial sides,
At both ends in the axial direction of the cage, there are provided step portions having an outer diameter larger than the inner diameter of the flange portion and capable of elastically compressing at least the difference between the inner diameter and the outer diameter in the radial direction. The part is elastically compressed to move over the collar part and then elastically restored to be incorporated into the outer ring, and the roller is incorporated from the inside in the radial direction with respect to the cage pocket. A roller bearing characterized in that a space surrounded by the inner side surface in the axial direction and the outer diameter surface of the step portion is a lubricant holding space.

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