Bearing

Abstract

To provide a bearing capable of not only giving pressurization to the bearing but also reducing the number of assembling parts and improving assemblability.SOLUTION: A bearing 100 according to the present invention includes an outer ring 104, an inner ring 108, balls 110 rolling between the outer ring and the inner ring, and a cover 114 covering an outside of the outer ring, wherein the cover includes a cylindrical portion 118 covering an outer peripheral surface 124 of the outer ring, an annular portion 120 continuous with one end 126 of the cylindrical portion and forming a pocket 130 with a side surface 128 of the outer ring, and a caulking portion 122 formed at the other end 132 of the cylindrical portion and engaging with the outer ring, and the pocket accommodates an elastic member 116 biasing the annular portion and the outer ring in a direction away from each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bearing having rolling elements that roll between an inner ring and an outer ring. [Background technology]

[0002] A bearing includes an inner ring, an outer ring, and rolling elements that roll between the inner and outer rings, and the rolling elements roll to rotate a shaft while supporting a load. Bearings are required to suppress, for example, axial rattle that accompanies shaft rotation, thereby suppressing vibration and noise.

[0003] For example, Patent Document 1 describes an electric linear actuator equipped with a support bearing. In this electric linear actuator, a disc spring is elastically mounted between the outer ring of the support bearing and the housing to apply pressure to the support bearing and suppress vibration and noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-57803 Summary of the Invention [Problem to be solved by the invention]

[0005] In the electric linear actuator of Patent Document 1, although a preload can be applied to the support bearing by a disc spring, the disc spring needs to be elastically mounted between the outer ring of the support bearing and the housing, which causes the problem of laborious assembly.In addition, since the support bearing and disc spring are separate components that must be assembled to the housing, the number of parts required during assembly increases.

[0006] In view of the above problems, the present invention has an object to provide a bearing that not only applies pressure to the bearing but also reduces the number of parts to be assembled and improves assembly efficiency. [Means for solving the problem]

[0007] In order to solve the above problems, a typical configuration of a bearing according to the present invention comprises an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a cover that covers the outside of the outer ring, wherein the cover has a cylindrical portion that covers the outer surface of the outer ring, an annular portion that is continuous with one end of the cylindrical portion and forms a pocket between the cylindrical portion and the side surface of the outer ring, and a crimping portion that is formed at the other end of the cylindrical portion and engages with the outer ring, and the pocket contains an elastic member that biases the annular portion and the outer ring in a direction separating them.

[0008] In order to solve the above problems, another typical configuration of a bearing according to the present invention comprises an outer ring, an inner ring, rolling elements that roll between the outer ring and the inner ring, and a cover that covers the inside of the inner ring, wherein the cover has a cylindrical portion that covers the inner surface of the inner ring, an annular portion that is continuous with one end of the cylindrical portion and forms a pocket between the cylindrical portion and the side surface of the inner ring, and a crimped portion that is formed at the other end of the cylindrical portion and engages with the inner ring, and the pocket contains an elastic member that biases the annular portion and the inner ring in a direction separating them. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a bearing that not only applies pressure to the bearing but also reduces the number of parts to be assembled and improves ease of assembly. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a bearing according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a view showing a main part of the bearing of FIG. 1. [Figure 3] FIG. 4 is a view showing a bearing according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a view showing a main part of the bearing of FIG. 3. 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] Fig. 1 is a diagram showing a bearing 100 according to a first embodiment of the present invention. In the drawing, a part of the bearing 100 is cut away to show the internal structure. Fig. 2 is a diagram showing a main part of the bearing 100 of Fig. 1.

[0013] Bearing 100 is a ball bearing and includes an outer ring 104 having a raceway surface 102 on its inner circumference, an inner ring 108 having a raceway surface 106 on its outer circumference, a row of balls 110 as rolling elements, and a cage 112 as shown in FIG. 2.

[0014] The balls 110 roll between the raceway surface 102 of the outer ring 104 and the raceway surface 106 of the inner ring 108. The cage 112 is provided between the outer ring 104 and the inner ring 108 as shown in Figure 2, and by holding the balls 110, it has the role of maintaining the spacing between the balls 110 and preventing the balls 110 from rubbing against each other.

[0015] The bearing 100 further includes a cover 114 and an elastic member 116. The cover 114 covers the outside of the outer ring 104 and has a cylindrical portion 118, an annular portion 120, and a crimped portion 122. The cylindrical portion 118 is a portion that covers an outer peripheral surface 124 of the outer ring 104. The annular portion 120 is continuous with one end 126 of the cylindrical portion 118 and bends from the end 126 to form a pocket 130 between the cover 114 and one side surface 128 of the outer ring 104.

[0016] The crimped portion 122 of the cover 114 is a portion that engages with the outer ring 104 , and is formed by crimping from the other end 132 of the cylindrical portion 118 along the other side surface 134 of the outer ring 104 .

[0017] The elastic member 116 is housed in a pocket 130 formed between the annular portion 120 of the cover 114 and one side surface 128 of the outer ring 104. As a result, the bearing 100 has an integrated structure in which the outer ring 104, inner ring 108, balls 110, cover 114, and elastic member 116 are configured as a single component (unit).

[0018] The elastic member 116 is a disc spring or the like that has elasticity in the axial direction, and is accommodated in the pocket 130 in a compressed state in the direction indicated by the arrow in FIG. 2(a) when the crimping portion 122 of the cover 114 is crimped.

[0019] Furthermore, when the elastic member 116 is housed in the pocket 130, the outer end 136 is pressed against the annular portion 120 of the cover 114, and the inner end 138 is pressed against one side surface 128 of the outer ring 104. As a result, the elastic member 116 biases the annular portion 120 of the cover 114 and the outer ring 104 in a direction separating them from each other.

[0020] Here, as shown in FIG. 2(b), a case where the bearing 100 is assembled between the housing 142 on the outer ring 104 side and the shaft (shaft 144) on the inner ring 108 side will be described.

[0021] In this case, shaft 144 pushes inner ring 108 to the right in the figure (in the direction of arrow A). When inner ring 108 moves in the direction of arrow A, outer ring 104 also moves in the direction of arrow A via balls 110. As a result, gap 146 is formed between the other side surface 129 of outer ring 104 and crimped portion 122 of cover 114. Furthermore, outer ring 104 is pushed to the left in the figure (in the direction of arrow Fa) by elastic member 116 in a compressed state. As a result, preload Fa is applied to balls 110 in bearing 100. Therefore, bearing 100 can damp radial and axial vibrations that accompany rotation of shaft 144.

[0022] Furthermore, because the bearing 100 has an integrated structure configured as a single unit as described above, the number of parts required for assembly into the housing 142 can be reduced, improving assembly efficiency.

[0023] Fig. 3 is a diagram showing a bearing 100A according to a second embodiment of the present invention. In the drawing, a part of the bearing 100A is cut away to show the internal structure. Fig. 4 is a diagram showing a main part of the bearing 100A of Fig. 3.

[0024] Bearing 100A differs from bearing 100 in that cover 115 covers the inside of inner ring 108 as shown in the figure, rather than the outside of outer ring 104, and further includes elastic member 117.

[0025] Cover 115 covers the inside of inner ring 108 and has a cylindrical portion 119, an annular portion 121, and a crimped portion 123. Cylindrical portion 119 is a portion that covers an inner circumferential surface 125 of inner ring 108. Annular portion 121 is continuous with one end 127 of cylindrical portion 119 and bends from end 127 to form a pocket 131 between itself and one side surface 140 of inner ring 108.

[0026] The crimped portion 123 of the cover 115 is a portion that engages with the inner ring 108 and is formed by crimping from the other end 133 of the cylindrical portion 119 along the other side surface 135 of the inner ring 108 .

[0027] Elastic member 117 is housed in pocket 131 formed between annular portion 121 of cover 115 and one side surface 140 of inner ring 108. As a result, bearing 100A has an integrated structure in which outer ring 104, inner ring 108, balls 110, cover 115, and elastic member 117 are configured as a single unit.

[0028] The elastic member 117 is a disc spring or the like that has elasticity in the axial direction, and is accommodated in the pocket 131 in a compressed state in the direction indicated by the arrow in FIG. 4(a) when the crimping portion 123 of the cover 115 is crimped.

[0029] Furthermore, when elastic member 117 is housed in pocket 131, outer end 137 is pressed against one side surface 140 of inner ring 108, and inner end 139 is pressed against annular portion 121 of cover 115. As a result, elastic member 117 biases annular portion 121 of cover 115 and inner ring 108 in a direction separating them from each other.

[0030] Here, a case where a bearing 100A is assembled between a housing 142 and a shaft 144 as shown in FIG. 4(b) will be described.

[0031] In this case, housing 142 pushes outer ring 104 to the right (in the direction of arrow B) in the figure. When outer ring 104 moves in the direction of arrow B, inner ring 108 also moves in the direction of arrow B via balls 110. As a result, gap 147 is formed between the other side surface 141 of inner ring 108 and crimped portion 123 of cover 115. Furthermore, inner ring 108 is pushed to the left (in the direction of arrow Fb) in the figure by elastic member 117 in a compressed state. As a result, preload Fb is applied to balls 110 in bearing 100A. Therefore, bearing 100A can dampen radial and axial vibrations that accompany rotation of shaft 144.

[0032] Furthermore, because the bearing 100A has an integrated structure configured as a single unit as described above, the number of parts required for assembly into the housing 142 can be reduced, improving assembly efficiency.

[0033] 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. [Explanation of symbols]

[0034] 100, 100A... bearing, 102... raceway surface of outer ring, 104... outer ring, 106... raceway surface of inner ring, 108... inner ring, 110... ball, 112... cage, 114, 115... cover, 116, 117... elastic member, 118, 119... cylindrical portion of cover, 120, 121... annular portion of cover, 122, 123... crimped portion of cover, 124... outer peripheral surface of outer ring, 125... inner peripheral surface of inner ring, 126, 127... one end of cylindrical portion , 128...one side surface of outer ring, 129...other side surface of outer ring, 130, 131...pocket, 132, 133...other end of cylindrical portion, 134...other side surface of outer ring, 135...other side surface of inner ring, 136, 137...outer end portion of elastic member, 138, 139...inner end portion of elastic member, 140...one side surface of inner ring, 141...other side surface of inner ring, 142...housing, 144...shaft, 146, 147...gap

Claims

1. The outer ring and With inner circle, a rolling element that rolls between the outer ring and the inner ring; a cover that covers the outside of the outer ring, The cover is a cylindrical portion covering an outer peripheral surface of the outer ring; an annular portion that is continuous with one end of the cylindrical portion and forms a pocket between itself and a side surface of the outer ring; a crimping portion formed at the other end of the cylindrical portion and adapted to engage with the outer ring, The pocket accommodates an elastic member that biases the annular portion and the outer ring in a direction separating them from each other.

2. The outer ring and With inner circle, a rolling element that rolls between the outer ring and the inner ring; a cover that covers the inside of the inner ring, The cover is a cylindrical portion covering an inner circumferential surface of the inner ring; an annular portion that is continuous with one end of the cylindrical portion and forms a pocket between itself and a side surface of the inner ring; a crimping portion formed at the other end of the cylindrical portion and adapted to engage with the inner ring, The pocket accommodates an elastic member that biases the annular portion and the inner ring in a direction separating them from each other.

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