Cage for self-aligning thrust roller bearing

Abstract

To provide a resin cage for a self-aligning thrust roller bearing capable of satisfying high size accuracy while suppressing the deformation of the cage when assembling the cage on an inner ring.SOLUTION: A cage 140 for a self-aligning thrust roller bearing (a bearing 100), that is, a resin cage for a self-aligning thrust roller bearing for holding rollers 130 rolling between an inner ring 110 and an outer ring 120, includes pockets 142 for holding the rollers 130, pillar parts 144 forming the pockets 142, an inner diameter ring 146 connecting the inner diameter sides of the pillar parts 144, an outer diameter cylinder 148 connecting the outer diameter sides of the pillar parts 144, holes 150 formed in the outer diameter cylinder 148, and retaining components 160 fitted to the holes 150 and protruding toward the inner ring 110.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cage of a thrust self-aligning roller bearing that holds rollers rolling between an inner ring and an outer ring.

Background Art

[0002] Generally, a bearing uses a cage for the bearing (hereinafter referred to as a cage). The cage has a role of maintaining the intervals between rolling elements and preventing the rolling elements from rubbing against each other by holding rolling elements (balls or rollers) in respective plurality of pockets. For example, in order to facilitate the assembly of a bearing, a configuration is known in which a rolling element is held between a cage and an inner ring and unitized.

[0003] The tapered roller bearing of Patent Document 1 is characterized in that "in a tapered roller bearing including an outer ring having a tapered raceway surface, an inner ring having a flange portion and a tapered raceway surface, a plurality of tapered rollers disposed between the raceway surfaces of the inner and outer rings, and a cage that holds each tapered roller, an engaging portion capable of engaging with the inner ring is provided on the large end side of the cage". According to Patent Document 1, "when the engaging portion provided on the cage engages with the inner ring, the cage is prevented from dropping off the inner ring, so that the tapered rollers held by the cage are also prevented from dropping off".

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the tapered roller bearing of Patent Document 1, after the rollers are housed in a press-formed metal cage, the cage is assembled into the inner ring and the engaging portion is caulked. When the cage is assembled to the inner ring in this way by caulking, the cage is distorted and deformed during caulking, and the dimensional accuracy such as the roundness and cylindricity of the cage is reduced, or the shape of the pocket is collapsed. Therefore, there is room for further improvement in the technology of Patent Document 1.

[0006] In view of such problems, an object of the present invention is to provide a resin cage for a thrust self-aligning roller bearing that can suppress deformation of the cage when the cage is assembled to the inner ring and satisfy high dimensional accuracy.

Means for Solving the Problems

[0007] In order to solve the above problems, a typical configuration of a cage for a thrust self-aligning roller bearing according to the present invention is a resin cage for a thrust self-aligning roller bearing that holds rollers that roll between an inner ring and an outer ring, and includes pockets that hold the rollers, column portions that form the pockets, an inner diameter ring that connects the inner diameter sides of the column portions, an outer diameter cylinder that connects the outer diameter sides of the column portions, holes formed in the outer diameter cylinder, and retaining parts that are fitted into the holes and protrude toward the inner ring.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a resin cage for a thrust self-aligning roller bearing that can suppress deformation of the cage when the cage is assembled to the inner ring and satisfy high dimensional accuracy.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Best Mode for Carrying Out the Invention

[0010] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in such embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and the drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements not directly related to the present invention are not shown.

[0011] FIG. 1 is an exploded perspective view of a thrust self-aligning roller bearing (hereinafter referred to as bearing 100) provided with a cage according to this embodiment. As shown in FIG. 1, the bearing 100 includes an inner ring 110, an outer ring 120, rollers 130, a cage 140, and a retaining component 160.

[0012] The roller 130 is a cylindrical member in a cluster type, having a smaller diameter on the inner peripheral side of the bearing 100 and a larger diameter on the outer peripheral side of the bearing 100. The roller 130 rolls between the inner ring 110 and the outer ring 120 as the bearing 100 rotates.

[0013] FIG. 2 is a perspective view illustrating a state in which the roller 130 is held between the inner ring 110 and the cage 140 to form a unit. FIG. 3 is a perspective view illustrating a state in which the cage 140 shown in FIG. 2 is observed from the inner ring 110 side. For easy understanding, in FIG. 3, a part of the inner ring 110 and the cage 140 is cut away to show a cross section.

[0014] The cage 140 of this embodiment shown in FIGS. 2 and 3 is a resin cage formed by injection molding of resin, and holds the roller 130. Since the resin cage 140 is lighter than a metal cage, it can be suitably used for a bearing that rotates at high speed. Also, since resin is less expensive than metal, the resin cage 140 can be manufactured at a lower cost than a metal cage.

[0015] The retainer 140 is composed of a pocket 142, a column portion 144, an inner diameter ring 146, and an outer diameter cylinder 148. The pocket 142 is a space formed by being partitioned by a plurality of column portions 144 and holds the roller 130. The plurality of column portions 144 are connected on the inner diameter side by the inner diameter ring 146 and on the outer diameter side by the outer diameter cylinder 148.

[0016] As a feature of the present embodiment, a hole 150 into which a retaining part 160 is fitted is formed in the outer diameter cylinder 148 of the retainer 140. When the retaining part 160 is fitted into the hole 150 of the outer diameter cylinder 148, it protrudes toward the inner ring 110.

[0017] Specifically, in the retainer 140 of the present embodiment, the hole 150 is formed at a position separated by a width W from the edge 148a of the outer diameter cylinder 148. On the other hand, a stepped portion 114 that protrudes outward from the outer peripheral surface 112 is formed on the inner ring 110. As a result, the retaining part 160 fitted into the hole 150 protrudes toward the outer peripheral surface 112 of the inner ring 110 and is locked to the stepped portion 114.

[0018] According to the retainer 140 of the present embodiment as described above, by fitting the retaining part 160 into the hole 150, the retainer 140 can be assembled to the inner ring 110 without caulking (without bending). Therefore, it is possible to suitably prevent the distortion and deformation of the retainer caused by the caulking process. For this reason, high dimensional accuracy can be satisfied in terms of the roundness and cylindricity of the retainer, rotation resistance can be suppressed, and premature breakage of the retainer can be suitably prevented.

[0019] In the cage 140 of the present embodiment, although the configuration in which the retaining component 160 fitted in the hole 150 is locked to the stepped portion 114 of the inner ring 110 has been illustrated, the present invention is not limited thereto. For example, in the case of the inner ring 110 having no stepped portion 114, the configuration may be "the retaining component 160 fitted in the hole 150 protrudes to the back surface 116 of the inner ring 110 and is locked thereto", or the configuration may be "a groove is formed in the outer peripheral surface 112 of the inner ring 110, and the retaining component 160 fitted in the hole 150 is fitted in the groove". Further, the number of the holes 150 and the retaining components 160 can be determined as appropriate.

[0020] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. Needless to say, the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive various modification examples or correction examples within the scope described in the claims, and it is naturally understood that those also belong to the technical scope of the present invention.

Industrial Applicability

[0021] The present invention can be used as a cage of a thrust self-aligning roller bearing that holds rollers rolling between an inner ring and an outer ring.

Explanation of Signs

[0022] 100... bearing, 110... inner ring, 112... outer peripheral surface, 114... stepped portion, 116... back surface, 120... outer ring, 130... roller, 140... cage, 142... pocket, 144... column portion, 146... inner diameter ring, 148... outer diameter cylinder, 148a... edge, 150... hole, 160... retaining component

Claims

【Claim 1】 In a resin cage of a thrust self-aligning roller bearing that holds rollers rolling between an inner ring and an outer ring, a pocket that holds the rollers, a column portion that forms the pocket, an inner diameter ring that connects the inner diameter side of the column portion, an outer diameter cylinder that connects the outer diameter side of the column portion, a hole formed in the outer diameter cylinder, a retaining component that is fitted into the hole and protrudes toward the inner ring, A resin cage of a thrust self-aligning roller bearing, characterized by comprising the above.

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