Bearing with cage

Abstract

To provide a bearing with a cage to which measures against heat generation in the bearing can be applied without causing a cost increase, and can suitably prevent damage to the bearing caused by heat generation during high-speed rotation.SOLUTION: A bearing (bearing 100) with a cage includes: an outer ring 110; an inner ring 120; a rolling element 130 that rolls between the outer ring and the inner ring; and a crown cage (cage 140) made of resin for holding the rolling element. The crown cage includes: a plurality of base portions 142 extending in the axial direction between the outer ring and the inner ring; pockets 146 formed between adjacent base portions 142 and holding the rolling element 130; a circular ring portion 148 connecting the ends of the plurality of base portions 142; and a plurality of projections 150 arranged on a back surface 148a of the circular ring portion 148. The plurality of projections 150 are a plurality of concentric circle-shaped ridges or a plurality of island-shaped projections arranged on a concentric circle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cage-equipped bearing including a crown-type cage made of resin. [Background technology]

[0002] Bearings generally use a cage. The cage holds the rolling elements (balls or rollers) in each of several pockets, maintaining the spacing between the rolling elements and preventing them from rubbing against each other. Metal cages and plastic cages are widely used.

[0003] As an example of a bearing with a plastic cage, Patent Document 1 discloses a ball bearing comprising "an outer raceway ring having an outer raceway surface, an inner raceway ring having an inner raceway surface, a plurality of balls arranged between the outer raceway surface and the inner raceway surface, and a plastic cage that arranges the plurality of balls evenly in the circumferential direction, wherein the cage has pocket portions at multiple locations in the circumferential direction that maintain the circumferential positions of the balls, and the pocket portions have a shape that opens to one axial side of the cage, and further comprising a locking member attached to either the outer raceway ring or the inner raceway ring." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-133769 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, bearings have been required to be able to handle high-speed rotation, which means that heat generation countermeasures are important to prevent bearings from being damaged by heat. One way to counter heat generation in bearings is to increase the surface area of the cage, outer ring, and inner ring in order to release more heat (mainly frictional heat) into the oil or air. However, creating irregularities on the surface to increase the surface area can result in increased stirring resistance, which is a problem.

[0006] Therefore, Patent Document 1 employs a "locking member that also functions as a shield." According to Patent Document 1, "by employing a locking member that also functions as a shield, it is possible to prevent excessive inflow of lubricating oil from the outside of the bearing into the inside of the bearing and to reduce the resistance to stirring of the lubricating oil caused by the balls." However, a structure that provides a shield as in Patent Document 1 increases the number of parts and assembly steps, resulting in increased costs.

[0007] In view of these problems, the present invention aims to provide a bearing with a retainer that can take measures to prevent heat generation in the bearing without increasing costs and that can effectively prevent damage to the bearing caused by heat generation during high-speed rotation. [Means for solving the problem]

[0008] In order to solve the above problems, a typical configuration of a caged bearing according to the present invention is a bearing with a cage comprising an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a resin crown-type cage that holds the rolling elements, wherein the crown-type cage comprises a plurality of bases extending in the axial direction between the outer ring and the inner ring, pockets formed between adjacent bases that hold the rolling elements, an annular portion connecting the ends of the plurality of bases, and a plurality of protrusions or recesses arranged on the back surface of the annular portion, and the plurality of protrusions or recesses are a plurality of concentric ridges or grooves, or a plurality of island-shaped protrusions or island-shaped holes arranged on concentric circles.

[0009] The island-shaped protrusions may be in the shape of a rectangular pillar, a circular pillar, a diamond-shaped pillar, or a spindle, and the island-shaped holes may be in the shape of a rectangular hole, a round hole, or a diamond-shaped or spindle-shaped depression. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a bearing with a retainer that can take measures against heat generation in the bearing without increasing costs and can effectively prevent damage to the bearing caused by heat generation during high-speed rotation. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram illustrating a bearing assembly with a cage according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view of the cage as viewed from the rear side. [Figure 3] FIG. 10 is a diagram illustrating a second embodiment of the cage. [Figure 4] FIG. 10 is a diagram illustrating a third embodiment of the cage. [Figure 5] FIG. 10 is a diagram illustrating a fourth embodiment of the cage. [Figure 6] FIG. 10 is a diagram illustrating another example of the cage. DETAILED DESCRIPTION OF THE INVENTION

[0012] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0013] Fig. 1 is a schematic diagram illustrating a bearing with a cage according to this embodiment (hereinafter referred to as bearing 100). As shown in Fig. 1, bearing 100 of this embodiment includes an outer ring 110, an inner ring 120, rolling elements 130 that roll between the outer ring 110 and the inner ring 120, and a crown-type cage (hereinafter referred to as cage 140) made of resin that holds rolling elements 130.

[0014] Fig. 2 is a perspective view of the retainer 140 of Fig. 1, observed from the rear side. The retainer 140 shown in Fig. 2 is made of a highly thermally conductive resin (for example, a resin containing a filler with high thermal conductivity, such as alumina or boron nitride), and has a plurality of base portions 142, claw portions 144, pockets 146, and annular portions 148.

[0015] The multiple bases 142 extend in the axial direction of the bearing 100 between the outer ring 110 and the inner ring 120, and have claws 144 formed at their tips. Pockets 146 that hold the rolling elements 130 are formed between adjacent bases 142, and the claws 144 prevent the rolling elements 130 from falling out of the pockets 146. The ends of the multiple bases 142 are connected by annular portions 148.

[0016] 1 and 2, the cage 140 included in the bearing 100 of this embodiment has a plurality of protrusions 150 formed on the back surface 148a of the annular portion 148. As shown in FIG.

[0017] According to the above configuration, because retainer 140 is made of a highly thermally conductive material (highly thermally conductive resin), heat generated by the rolling of rolling elements 130 when bearing 100 rotates can be efficiently transferred to retainer 140. Furthermore, protrusions 150 formed on annular portion 148 of retainer 140 function as heat dissipation portions, so that the heat transferred to retainer 140 is released to the surroundings.

[0018] In particular, since the multiple protrusions 150 are ridges spaced apart in the radial direction of the bearing 100, it is possible to suppress the agitation of the lubricating oil when the bearing rotates. This makes it possible to suppress the generation of agitation heat in the protrusions 150.

[0019] As described above, according to the bearing 100 of this embodiment, high heat transfer performance and heat dissipation performance can be obtained in the cage 140 without adding any additional parts. Therefore, damage to the bearing 100 caused by residual heat generated during high-speed rotation can be effectively prevented.

[0020] 3 to 5 are diagrams illustrating other embodiments of the retainer, illustrating the state when annular portion 148 is observed from the back side. In retainer 140a illustrated in Fig. 3, retainer 140b illustrated in Fig. 4, and retainer 140c illustrated in Fig. 5, multiple island-shaped protrusions arranged on concentric circles are formed on back surface 148a of annular portion 148, instead of the multiple ridge-like projections 150 of Fig. 2.

[0021] A cage 140a shown in Fig. 3 has a plurality of cylindrical island-shaped protrusions 152 formed on a back surface 148a of an annular portion 148. A cage 140b shown in Fig. 4 has a plurality of rectangular pillar-shaped island-shaped protrusions 154 formed on a back surface 148a of the annular portion 148. A cage 140c shown in Fig. 5 has a plurality of spindle-shaped island-shaped protrusions 156 formed on a back surface 148a of the annular portion 148. These island-shaped protrusions 152, 154, 156 are arranged in a plurality of rows in the radial direction, and in each row, a plurality of island-shaped protrusions 152, 154, 156 are arranged concentrically at intervals.

[0022] The above-described configuration of forming island-shaped protrusions can also achieve the same effect as when multiple ridge-like protrusions 150 are formed. In this embodiment, the island-shaped protrusions are exemplified as being cylindrical, prismatic, and spindle-shaped, but are not limited to these. The island-shaped protrusions may also have other shapes, such as a polygonal prism shape such as a diamond-shaped prism, or a shape that combines a cylinder and a prismatic shape. However, even when other shapes are used, it is preferable that the island-shaped protrusions be arranged concentrically with intervals between them.

[0023] Also, instead of protrusions, recesses may be formed. The recesses may be grooves or island-shaped holes (dimple-shaped). The island-shaped holes may be, for example, square holes, round holes, or diamond-shaped or spindle-shaped depressions. However, even when other shapes are used, it is preferable that they are arranged concentrically at intervals.

[0024] Figure 6 shows another example of a cage. In bearing 100A shown in Figure 6(a), cage 140d is an outer ring guide (race guide). In bearing 100B shown in Figure 6(b), cage 140e is an inner ring guide. Because the race guide cage slides on outer ring 110 or inner ring 120, heat from outer ring 110 or inner ring 120 is transferred. Therefore, the outer ring 110 or inner ring 120 can also be cooled by the protrusions or recesses of cages 140d, 140e, and when the present invention is applied, a greater cooling effect can be obtained.

[0025] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0026] The present invention can be used as a cage-equipped bearing having a crown-type cage made of resin. [Explanation of symbols]

[0027] 100, 100A, 100B... bearing, 110... outer ring, 120... inner ring, 130... rolling element, 140, 140a to 140e... cage, 142... base, 144... claw portion, 146... pocket, 148... annular portion, 148a... back surface, 150... protrusion, 152... island-shaped protrusion, 154... island-shaped protrusion, 156... island-shaped protrusion

Claims

1. A cage-equipped bearing including an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a resin crown-type cage that holds the rolling elements, The crown type cage is a plurality of base portions extending axially between the outer ring and the inner ring; a pocket formed between adjacent base portions to hold the rolling elements; a ring portion connecting end portions of the plurality of base portions; a plurality of protrusions or recesses disposed on a rear surface of the annular portion; A bearing with a cage, wherein the plurality of projections or recesses are a plurality of concentric ridges or grooves, or a plurality of island-shaped projections or island-shaped holes arranged on concentric circles.

2. 2. The bearing with cage according to claim 1, wherein the island-shaped protrusions are in the shape of a rectangular column, a circular column, a diamond column, or a spindle.

3. 2. The bearing with cage according to claim 1, wherein the island-shaped holes are square holes, round holes, or diamond-shaped or spindle-shaped recesses.

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