Bearing with cage

Abstract

To provide a bearing with a cage which can prevent excessive supply of lubrication oil to a bearing without causing size-up and cost increase of the bearing and can suppress agitation resistance and generation of agitation heat caused by the agitation resistance.SOLUTION: A bearing (bearing 100) with a cage includes as a representative configuration: an outer ring 110; an inner ring 120; a rolling element 130 rolling between the outer ring 110 and the inner ring 120; and a resin crown type cage 140 which holds the rolling element 130. A cage side conical face 150 is formed to be inclined to the outside of the bearing 100 toward the outer ring 110 side on a back face of the crown type cage 140. An outer ring side conical face 160 is formed to be adjacent to the cage side conical face 150 at an edge on an inner peripheral side of an end face of the outer ring 110.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bearing with a cage provided with a resin cage.

Background Art

[0002] Bearings generally use cages. The cage has the role of maintaining the spacing between rolling elements and preventing the rolling elements from rubbing against each other by holding rolling elements (balls or rollers) in a plurality of pockets respectively. As the cage, a metal cage and a resin cage are widely used.

[0003] For example, Patent Document 1 discloses a ball bearing "including an outer raceway ring having an outer raceway surface, an inner raceway ring having an inner raceway surface, a plurality of balls disposed between the outer raceway surface and the inner raceway surface, and a resin cage that evenly arranges the plurality of balls in the circumferential direction, the cage having pocket portions for maintaining the circumferential positions of the balls at a plurality of locations in the circumferential direction, the pocket portions having an opening on one side surface in the axial direction of the cage, and further including a locking member attached to one of the outer raceway ring and the inner raceway ring".

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, bearings are required to cope with high-speed rotation, and for this purpose, measures against heat generation in the bearing are important. One of the factors causing heat generation is the stirring resistance (shearing resistance) of the lubricating oil in the bearing. The bearing is supplied with lubricating oil, and when the supply amount of the lubricating oil becomes excessive, the stirring resistance increases and stirring heat is generated.

[0006] In order to suppress the excessive supply of lubricating oil to the bearing, Patent Document 1 employs a "locking member that also serves as a shield". According to Patent Document 1, "By adopting a locking member that also serves as a shield, it is possible to suppress the excessive inflow of lubricating oil from the outside of the bearing to the inside of the bearing and suppress the stirring resistance of the lubricating oil by the balls." However, with a structure in which a shield is provided as in Patent Document 1, it will lead to an increase in the size and cost of the bearing.

[0007] In view of such problems, the present invention aims to provide a bearing with a cage that can prevent excessive supply of lubricating oil to the bearing without causing an increase in the size or cost of the bearing, and can suppress the stirring resistance and thus the generation of stirring heat resulting therefrom.

Means for Solving the Problems

[0008] In order to solve the above problems, a typical configuration of the bearing with a cage according to the present invention includes an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a resin crown-shaped cage that holds the rolling elements. On the back surface of the crown-shaped cage, a cage-side conical surface that inclines toward the outside of the bearing as it goes toward the outer ring side is formed, and on the inner peripheral side edge of the end surface of the outer ring, an outer-ring-side conical surface adjacent to the cage-side conical surface is formed.

[0009] The above outer-ring-side conical surface is preferably formed as the same conical surface as the cage-side conical surface.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a bearing with a cage that can prevent excessive supply of lubricating oil to the bearing without causing an increase in the size or cost of the bearing, and can suppress the stirring resistance and thus the generation of stirring heat resulting therefrom.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail 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 the present specification and 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.

[0013] FIG. 1 is a schematic diagram for explaining a bearing with a cage (hereinafter referred to as bearing 100) according to the present embodiment. As shown in FIG. 1, the bearing 100 of the present 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 resin crown-shaped cage (hereinafter referred to as cage 140) that holds the rolling elements 130. Note that since FIG. 1 is a cross-sectional view of the annular bearing 100, only one rolling element 130 is shown, but actually the bearing 100 has a plurality of rolling elements 130.

[0014] FIG. 2 is an overall perspective view of the cage 140 in FIG. 1. The cage 140 shown in FIG. 2 is made of a resin such as nylon (polyamide synthetic resin) or ABS, and has a plurality of bases 142, claw portions 144, and pockets 146. The bases 142 extend in the axial direction of the bearing 100 between the outer ring 110 and the inner ring 120, and claw portions 144 are formed at the tips. Between adjacent bases 142, pockets 146 for holding the rolling elements 130 are formed, and the claw portions 144 prevent the rolling elements 130 from detaching from the pockets 146.

[0015] FIG. 4 is a view for explaining a conventional bearing with a cage (hereinafter referred to as bearing 10) provided with a shield 20. Regarding the conventional bearing 10, for the components that are substantially common to the bearing 100 of the present embodiment described above, duplicate explanations are omitted by attaching the same reference numerals.

[0016] The conventional bearing illustrated in FIG. 4 includes an outer ring 11, an inner ring 120, rolling elements 130 that roll between them, and a resin crown-shaped cage (hereinafter referred to as cage 14) that holds the rolling elements 130. The cage 14 has a plurality of base portions 14a, claw portions 14b, and pockets (not shown). The base portion 14a extends in the axial direction of the bearing 10 between the outer ring 11 and the inner ring 120, and claw portions 14b are formed at the tips.

[0017] In the conventional bearing 10, a shield 20 that extends toward the outer peripheral surface of the inner ring 120 is provided on the inner peripheral surface of the outer ring 11. Thereby, "excessive inflow of lubricating oil between the outer ring and the inner ring" when the bearing 10 rotates at high speed is prevented by the shield 20. However, when a shield 20 is provided as in the conventional bearing 10, the width W2 of the bearing 10 becomes wider. For this reason, the size and cost of the bearing 10 increase.

[0018] Therefore, in the bearing 100 of the present embodiment, as shown in FIGS. 1 and 2, a cage-side conical surface 150 that inclines toward the outside of the bearing 100 as it goes toward the outer ring 110 side is formed on the back surface of the crown-shaped cage 140 (base portion 142). Further, as shown in FIG. 1, an outer-ring-side conical surface 160 that is adjacent to the cage-side conical surface 150 in the radial direction of the bearing 100 is formed on the inner peripheral side edge of the end surface of the outer ring 110.

[0019] According to the bearing 100 of the present embodiment, when the lubricating oil flows between the outer ring 110 and the inner ring 120 toward the cage-side conical surface 150 during high-speed rotation, it rotates as an accompanying flow of the cage-side conical surface 150 and has a direction component in the D1 direction, which is the radially outer side of the bearing 100, due to centrifugal force. Then, it is guided from the cage-side conical surface 150 to the outer-ring-side conical surface 160 and flows in the D2 direction toward the radially outer side of the bearing 100. Thereby, since the lubricating oil trying to flow into the inside of the bearing 100 can be discharged outside the outer ring 110, excessive supply of the lubricating oil into the bearing 100 can be suppressed.

[0020] At this time, in the bearing 100 of the present embodiment, since the same effect can be obtained without using the shield 20 as in the conventional bearing 10, the width W1 of the bearing 100 becomes smaller than the width W2 of the conventional bearing 10. Therefore, according to the bearing 100 of the present embodiment, excessive supply of the lubricating oil to the bearing 100 can be prevented without causing an increase in the size or cost of the bearing 100, and it is possible to suppress the stirring resistance and thus the generation of stirring heat caused thereby.

[0021] Further, in the bearing 100 of the present embodiment, the outer-ring-side conical surface 160 forms the same conical surface as the cage-side conical surface. In other words, in the state observed in cross section as shown in FIG. 1, the outer-ring-side conical surface 160 is located on the extension line L of the cage-side conical surface 150. That is, the cage-side conical surface 150 and the outer-ring-side conical surface 160 are located on the same straight line, and the inclination angle θ1 of the cage-side conical surface 150 with respect to the axial direction and the inclination angle θ2 of the outer-ring-side conical surface 160 with respect to the axial direction are the same inclination angle (θ1 = θ2). According to such a configuration, the lubricating oil whose flow direction has changed on the cage-side conical surface 150 can be flowed most efficiently toward the outer-ring-side conical surface 160.

[0022] FIG. 3 is a diagram for explaining another example of the bearing with a cage according to the present invention. In the bearing 100a illustrated in FIG. 3(a), the inclination angle θ1 of the cage-side conical surface 150 and the inclination angle θ3 of the outer ring-side conical surface 160a are the same (θ1 = θ3). Further, the outer ring-side conical surface 160a is not located on the extension line L of the cage-side conical surface 150, but is disposed at a position shifted toward the center of the bearing 100a with respect to the cage-side conical surface 150 (a position retracted from the cage-side conical surface 150).

[0023] In the bearing 100b illustrated in FIG. 3(b), the inclination angle θ4 of the outer ring-side conical surface 160b is larger than the inclination angle θ1 of the cage-side conical surface 150 (θ1 < θ4). That is, the outer ring-side conical surface 160b is less inclined than the cage-side conical surface 150. Further, the outer ring-side conical surface 160b is located closer to the center of the bearing 100b than the extension line L of the cage-side conical surface 150.

[0024] In the bearing 100c illustrated in FIG. 3(c), the inclination angle θ5 of the outer ring-side conical surface 160c is smaller than the inclination angle θ1 of the cage-side conical surface 150 (θ1 > θ5). That is, the outer ring-side conical surface 160b is steeper than the cage-side conical surface 150. Further, the outer peripheral side of the outer ring-side conical surface 160c protrudes from the extension line L, but the inner peripheral side of the outer ring-side conical surface 160c is located closer to the center of the bearing 100b than the extension line L.

[0025] Also, with the bearings 100a in FIG. 3(a), 100b in FIG. 3(b), and 100c in FIG. 3(c) described above, it is possible to guide the lubricating oil flow generated on the cage-side conical surface 150 to the outer ring-side conical surfaces 160a to 160c without inhibiting the flow, and the same effect as that of the bearing 100 in FIG. 1 can be obtained.

[0026] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of 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

[0027] The present invention can be used as a bearing with a cage, which includes an inner ring, an outer ring, rolling elements that roll between the inner ring and the outer ring, and a resin crown-shaped cage that holds the rolling elements.

Explanation of Reference Numerals

[0028] 10... bearing, 12... outer ring, 14... cage, 14a... base portion, 14b... claw portion, 20... shield, 100... bearing, 100a... bearing, 100b... bearing, 100c... bearing, 110... outer ring, 120... inner ring, 130... rolling element, 140... cage, 142... base portion, 144... claw portion, 146... pocket, 150... cage-side conical surface, 160... outer-ring-side conical surface, 160a... outer-ring-side conical surface, 160b... outer-ring-side conical surface, 160c... outer-ring-side conical surface

Claims

1. The bearing comprises an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a resin crown cage that holds the rolling elements, A cage-side conical surface is formed on a back surface of the crown cage, the conical surface inclining toward the outside of the bearing as it approaches the outer ring, A bearing with a cage, characterized in that an outer ring side conical surface adjacent to the cage side conical surface is formed on the inner peripheral edge of the end face of the outer ring.

2. 2. The bearing with cage according to claim 1, wherein the outer ring side conical surface forms the same conical surface as the cage side conical surface.

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