Bearing with holder

Abstract

To provide a bearing with a holder that enables miniaturization of the bearing while minimizing change in layout of components around the bearing.SOLUTION: A bearing (bearing 100) with a holder of the present invention is configured to comprise an outer ring 110, an inner ring 120, balls 130 that roll between the outer ring 110 and the inner ring 120, and a crown-shaped resin holder 140 that holds the balls 130. On a side where a back surface 142 of the holder 140 is located, one end surface position of the outer ring 110 or the inner ring 120 is located outside the back surface 142 of the holder 140, and the other end surface position of the outer ring 110 or the inner ring 120 is located inside the back surface of the holder 140.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bearing assembly with a cage that includes a crown-type cage made of resin. [Background technology]

[0002] Bearings generally use cages. 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. There are various types of cages used, one of which is the crown cage.

[0003] For example, Patent Document 1 discloses "a multi-point contact ball bearing comprising an inner ring having an inner ring raceway groove on its outer peripheral surface, an outer ring having an outer ring raceway groove on its inner peripheral surface, a plurality of balls arranged to roll freely between the inner ring raceway groove and the outer ring raceway groove, and a resin crown-type cage having a plurality of pockets that rotatably hold the balls." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-122556 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been a demand for smaller bearings. One way to miniaturize bearings is to narrow the width of the outer and inner rings, as long as they can still hold the balls. However, while narrowing the width of the outer and inner rings does result in a smaller bearing, the crown cage is exposed outside the end faces of the outer and inner rings. This requires a design change to the layout of parts around the bearing to prevent other components from coming into contact with the crown cage, which places restrictions on their placement.

[0006] In view of the above problems, the present invention aims to provide a cage-equipped bearing that allows for miniaturization of the bearing while minimizing changes to the layout of components around the bearing. [Means for solving the problem]

[0007] In order to solve the above problems, a typical configuration of a bearing with a cage according to the present invention comprises an outer ring, an inner ring, balls that roll between the outer ring and the inner ring, and a crown-shaped resin cage that holds the balls, and is characterized in that on the side where the back surface of the cage is located, one end face of the outer ring or the inner ring is located outside the back surface of the cage, and the other end face of the outer ring or the inner ring is located inside the back surface of the cage.

[0008] On the side opposite to the back surface of the cage, the outer ring and the inner ring may be aligned with each other in end face position. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a bearing with a cage that can reduce the size of the bearing while minimizing changes to the layout of parts around the bearing. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating a first example of a bearing assembly with a cage according to the present embodiment. FIG. [Figure 2] FIG. 4 is a schematic diagram illustrating a second example of the bearing assembly with a cage according to the present embodiment. [Figure 3] 10A and 10B are diagrams illustrating a configuration in which bearings are assembled to a housing and a shaft. [Figure 4] 4A to 4C are diagrams illustrating the mounting of the bearing of the embodiment to the housing. [Figure 5] FIG. 10 is a diagram illustrating a state in which bearings are stacked. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] (Bearing 100 of the first embodiment) Fig. 1 is a schematic diagram illustrating a first example of a bearing with a cage according to this embodiment. Examples of the bearing 100 of the first example include a deep groove ball bearing and a multi-point contact ball bearing. Fig. 1 shows an example of a deep groove ball bearing, with two contact points and a contact angle of 0°.

[0013] As shown in Figure 1, bearing 100 of the first embodiment includes outer ring 110, inner ring 120, balls 130 which are rolling elements that roll between outer ring 110 and inner ring 120, and a crown-shaped resin cage 140 that holds the balls. Note that Figure 1 is a cross-sectional view of annular bearing 100, and so only one rolling element 130 is shown, but in reality bearing 100 has multiple rolling elements 130.

[0014] In the bearing 100 of this embodiment, on the side where the back surface 142 of the cage 140 is located, the position (end surface position) of the end face 122 of the inner ring 120 is located outward by a width A1 from the back surface 142 of the cage 140. In addition, the position (end surface position) of the end face 112 of the outer ring 110 is located inward by a width A2 from the back surface 142 of the cage 140.

[0015] Furthermore, in the present embodiment 100, in the outer ring 110 which is set to a narrow width, the width B from the center of the ball 130 to the end face 112 is set to the same value as the width C from the center of the ball 130 to the end face 114. In other words, the outer ring 110 is symmetrical with respect to the ball 130 in the width direction.

[0016] Looking at the above configuration from another perspective, it can also be said that outer ring 110 has a minimum width to allow balls 130 to roll, and inner ring 120 has a wider width on the back side of retainer 140 to protect retainer 140.

[0017] According to the above configuration, the width of outer ring 110 can be narrowed, thereby enabling the miniaturization of bearing 100. Furthermore, as will be described later, by protecting cage 140 with inner ring 120, it is possible to minimize changes to the layout of parts around bearing 100 compared to when the widths of both outer ring 110 and inner ring 120 are narrowed.

[0018] Furthermore, in bearing 100 of this embodiment, the position of end face 114 of outer ring 110 and the position of end face 124 of inner ring 120 are aligned on the side opposite back surface 142 of cage 140. In particular, the end faces of outer ring 110 and inner ring 120 on the side opposite back surface 142 of cage 140 are positioned close to balls 130 within a range that allows balls 130 to be held. This makes it possible to further reduce the size of bearing 100.

[0019] (Bearing 200 of the second embodiment) FIG. 2 is a schematic diagram illustrating a second embodiment of the cage-equipped bearing according to the present invention. Components common to the bearing 100 of the first embodiment are given the same reference numerals and will not be described again. Also, descriptions of configurations similar to those of the bearing 100 of the first embodiment will not be described. FIG. 2 shows a four-point contact as an example of multi-point contact, with four contact points at a predetermined contact angle. As another example (not shown), the present invention can also be applied to a three-point contact ball bearing.

[0020] In the bearing 200 of the second embodiment, the position (end face position) of the end face 212 of the outer ring 210 is located on the side where the back face 142 of the cage 140 is located, outside the back face 142 of the cage 140 by a width D1. Also, the position (end face position) of the end face 222 of the inner ring 220 is located inside the back face 142 of the cage 140 by a width D2. With this configuration, it is possible to obtain the same effects as the bearing 100 of the first embodiment.

[0021] Figure 3 is a diagram illustrating a configuration in which a bearing is assembled to a housing 102 and a shaft 104. Figure 3(a) is a diagram illustrating a configuration in which the bearing 100 of Example 1 is assembled to the housing 102 and the shaft 104. Figure 3(b) is a diagram illustrating a configuration in which the bearing 200 of Example 2 is assembled to the housing 102 and the shaft 104. Figure 3(c) is a diagram illustrating a configuration in which the bearing 10 of the comparative example is assembled to the housing 102 and the shaft 104, and Figure 3(d) is a diagram illustrating the bearing 10 assembled in the reverse direction.

[0022] 3(c) and 3(d), both the outer ring 11 and the inner ring 12 have a minimum width to allow the balls 130 to roll. This results in the cage 140 protruding. Furthermore, because the bearing 10 has a shape symmetrical about the center of the balls 130 and can be assembled in the opposite direction, the cage 140 may end up protruding on the opposite side.

[0023] In the configuration of FIG. 3(c), the outer ring 11 side of the cage 140 is protected by the housing 102, but the inner ring 12 side is not protected. Also, in the configuration of FIG. 3(d), the inner ring 12 side of the cage 140 is protected by the shaft 104, but the outer ring 11 side is not protected. For this reason, in the bearing 10 of the comparative example, other parts must be installed at a distance on both the left and right to prevent contact with other parts, which imposes restrictions on the layout of parts around the inner ring 12 side and the outer ring 11 side. Therefore, ultimately, it is difficult to achieve space saving.

[0024] In contrast, when bearing 100 of the first embodiment shown in Figure 3(a) is assembled to housing 102 and shaft 104, inner ring 120 is disposed below back surface 142 of retainer 140 in the figure, and housing 102 is disposed above back surface 142 of retainer 140 in the figure. Therefore, other parts are protected from contact with retainer 140, and there is no risk of peripheral parts interfering with retainer 140 without taking any special measures.

[0025] 3(b), when the bearing 200 of the second embodiment is assembled to the housing 102 and the shaft 104, the outer ring 210 is disposed above the rear surface 142 of the retainer 140 in the figure, and the shaft 104 is disposed below the rear surface 142 of the retainer 140 in the figure. Therefore, as with the bearing 100, there is no risk of other parts interfering with the retainer 140 without taking any special measures.

[0026] FIG. 4 is a diagram illustrating the mounting of the bearing of the embodiment to the housing 102.

[0027] Both the bearing 100 of the first embodiment and the bearing 200 of the second embodiment have shapes that are asymmetrical with respect to the center of the ball 130. Therefore, as shown in Figures 4(a) and 4(b), if the bearing 100 of the first embodiment or the bearing 200 of the second embodiment is assembled incorrectly, misalignments M1 and M2 will occur between the housing 102 and the shaft 104. Therefore, with the bearing 100 of the first embodiment and the bearing 200 of the second embodiment, it is possible to immediately detect any incorrect assembly into the housing.

[0028] Figure 5 is a diagram illustrating a state in which bearings are stacked. Figure 5(a) is a diagram illustrating a state in which bearings 100 of the first embodiment are stacked. Figure 5(b) is a diagram illustrating a state in which bearings 10 of the comparative example are stacked.

[0029] When multiple bearings 10 of the comparative example are stacked, the protruding cage 140 may interfere with the balls 130 of adjacent bearings 10, as shown in Figure 5(b). For this reason, careful handling is required, such as by inserting spacers.

[0030] 5(a), in the bearing 100 of the first embodiment, the inner rings 120, which are wider than the inner rings 120, come into contact with each other, preventing interference between the cage 140 and the balls 130 of the adjacent bearing 100. Therefore, it is possible to effectively prevent damage to the cage 140 and the balls 130.

[0031] 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]

[0032] The present invention can be used as a cage-equipped bearing having a crown-type cage made of resin. [Explanation of symbols]

[0033] 10...bearing, 11...outer ring, 11a...end face, 12...inner ring, 12a...end face, 100...bearing, 102...housing, 104...shaft, 110...outer ring, 112...end face, 114...end face, 120...inner ring, 122...end face, 124...end face, 130...ball, 140...retainer, 142...back face, 200...bearing, 210...outer ring, 212...end face, 220...inner ring, 222...end face

Claims

1. The outer ring and With inner circle, balls that roll between the outer ring and the inner ring; A resin crown-shaped cage is provided to hold the balls, On the side where the back surface of the retainer is located, an end face position of one of the outer ring and the inner ring is located outside a back surface of the cage, A bearing with a cage, characterized in that the end face position of the other of the outer ring or the inner ring is located inside the back surface of the cage.

2. On the opposite side to the back surface of the retainer, 2. The bearing with cage according to claim 1, wherein the outer ring and the inner ring have end faces aligned with each other.

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