Rolling bearings

Abstract

To provide rolling bearings with excellent vibration damping properties. [Solution] A rolling bearing 40 comprising: an inner ring 41 having an annular first rolling surface 43 facing radially outward, and a plurality of first holes 52 arranged annularly radially inward from the first rolling surface 43 and extending in the axial direction; an outer ring 44 disposed radially outward from the inner ring 41 and having an annular second rolling surface 47 facing radially inward; and a plurality of vibration-damping members 60 disposed within the plurality of first holes 52.

Description

Technical Field

[0001] The present invention relates to a rolling bearing.

Background Art

[0002] There is known a bearing device around a drive shaft of an automobile or the like, in which an elastic body (elastomer) is provided around a rolling bearing (for example, Patent Document 1). The drive shaft transmits power from a power unit or a transmission to a wheel tire. The power unit includes, for example, a motor or an internal combustion engine. In such a bearing device, the elastic body provided around the rolling bearing functions as a vibration damping member that attenuates vibrations caused by the rotation of the rolling bearing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a vibration damping member made of an elastomer is disposed between a hole portion that can be fitted with a rolling bearing and the rolling bearing, there is a risk that the amount of deviation of the rotation center of the rolling bearing with respect to the center of the hole portion increases. Therefore, when a rolling bearing is provided in a hole portion around a drive shaft, it is preferable that the rolling bearing itself has vibration damping performance.

[0005] An object of the present disclosure is to provide a rolling bearing having excellent vibration damping properties.

Means for Solving the Problems

[0006] An aspect of the present disclosure is an inner ring, an annular first rolling surface facing radially outward, a plurality of first hole portions that are annularly arranged radially inward of the first rolling surface and extend in the axial direction, and an inner ring having An outer ring positioned radially outward from the inner ring, having an annular second rolling surface facing radially inward, Multiple vibration-damping members arranged within the multiple first holes, It is a rolling bearing having [a certain characteristic]. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a rolling bearing with excellent vibration damping properties. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view of the structure according to the embodiment. [Figure 2] This is a cross-sectional view of the structure according to the embodiment. [Figure 3] This is a cross-sectional view of a modified structure. [Figure 4] This is a cross-sectional view of a modified structure. [Figure 5] This is a cross-sectional view of a modified structure. [Figure 6] This is a cross-sectional view of a modified structure. [Modes for carrying out the invention]

[0009] The embodiments relating to this disclosure will be described below with reference to the drawings. The scale of the drawings is not necessarily accurate, and some features may be exaggerated or omitted. The vibration isolation structure described herein is applicable to a structure (not shown) around a rotating shaft in an automobile or the like. The rotating shaft is, for example, a drive shaft located around a power unit or transmission. The power unit includes, for example, a motor or an internal combustion engine.

[0010] In the following explanation, the direction along the axial direction of a rolling bearing is called the X direction. The direction toward the bottom surface of a recessed fitting that opens axially is called the -X direction. The direction opposite to the -X direction is called the +X direction. The vertical direction (up and down direction) when a rolling bearing is positioned so that the X direction is parallel to the horizontal direction is called the Y direction. The direction vertically upward in this case is called the +Y direction. The direction vertically downward in this case is called the -Y direction. The direction perpendicular to the X and Y directions in this case is called the Z direction. The direction away from the central axis of the rolling bearing is called the radially outward direction. The direction toward the central axis of the rolling bearing is called the radially inward direction.

[0011] The structure 10 according to this embodiment includes a shaft 20, a bearing 40, and a support 30, as shown in Figures 1 and 2.

[0012] The shaft 20 is cylindrical, extending uniformly along axis XC, as shown in Figure 2. Axis XC is a virtual centerline along the X-axis direction. Axis XC extends horizontally. The shaft 20 has sides 22. The shaft 20 is connected to a drive unit (not shown), which includes a motor and / or a transmission. The shaft 20 is rotatable around axis XC by the drive unit. The shaft 20 is positioned in a predetermined position relative to a bearing 40 or support 30 (described later) by known positioning means (not shown). The shaft 20 is formed from, for example, steel for mechanical structures.

[0013] The support 30 supports the shaft 20 via a bearing 40. The support 30 is formed from, for example, steel material for mechanical structures. The support 30 has an outer surface 30a and support holes 32. The outer surface 30a faces the +X direction.

[0014] The support hole 32 is cylindrical and penetrates the support 30 in the X direction. The support hole 32 has a large diameter portion 34, a small diameter portion 35, and a stepped surface 36. The large-diameter portion 34 is a cylindrical hole that opens on the outer surface 30a. The large-diameter portion 34 fits with the outer diameter portion 44a of the bearing 40 (details will be described later). The large-diameter portion 34 is an example of a fitting portion. The support 30 supports the bearing 40 at the large-diameter portion 34. The large-diameter portion 34 has a hole wall 34a. The hole wall 34a is the cylindrical surface of the large-diameter portion 34. The hole wall 34a faces radially inward. The hole wall 34a opens on the outer surface 30a. The hole wall 34a fits with the outer diameter portion 44a of the bearing 40. The hole wall 34a is an example of the first peripheral wall. The small-diameter portion 35 is a cylindrical hole formed on the side farther from the outer surface 30a than the large-diameter portion 34. The small-diameter portion 35 opens at a step surface 36 (details will be described later). The small-diameter portion 35 is concentric with the large-diameter portion 34. The diameter of the small-diameter portion 35 is larger than the diameter of the shaft body 20 and smaller than the diameter of the large-diameter portion 34. The small-diameter portion 35 opens the inner end surface 42b of the bearing 40 fitted to the large-diameter portion 34 (details will be described later). The step surface 36 is planar and connects the large-diameter portion 34 and the small-diameter portion 35. That is, the step surface 36 is provided between the large-diameter portion 34 and the small-diameter portion 35. The step surface 36 faces the +X side. When the bearing 40 is disposed in the support hole 32, the step surface 36 faces the outer end surface 45b of the outer ring 44 (details will be described later). The step surface 36 is an example of the first facing portion. In the structure 10, the step surface 36 overlaps only the outer end surface 45b in the axial direction. That is, the step surface 36 does not face the inner end surface 42b of the inner ring 41.

[0015] The bearing 40 is a rolling bearing provided around the shaft body 20. The rolling bearing according to the present disclosure is a radial bearing. The bearing 40 is a ball bearing. The rolling bearing according to the present disclosure is not limited to a ball bearing as long as it is a radial bearing. The bearing 40 may be a roller bearing. The bearing 40 may be a tapered roller bearing or an angular ball bearing. The bearing 40 is disposed and supported inside the support hole 32 of the support 30. The bearing 40 has a plurality of rolling elements 40a, an inner ring 41, an outer ring 44, and a plurality of vibration damping members 60. The rolling elements 40a of the bearing 40, which is a ball bearing, are spherical. A plurality of rolling elements 40a are arranged in an annular shape at a predetermined interval along the rolling surfaces 43 and 47 of an inner ring 41 and an outer ring 44, which will be described later. In the bearing 40 of the embodiment, as shown in FIG. 1, eleven rolling elements 40a are arranged at a predetermined interval.

[0016] The inner ring 41 is annular and fits onto the shaft body 20. The inner ring 41 is disposed between the rolling element 40a and the shaft body 20. The inner ring 41 has an inner diameter portion 41a, an inner end face 42, a first rolling surface 43, and a plurality of first hole portions 52.

[0017] The inner diameter portion 41a is cylindrical and faces the radially inner side of the annular inner ring 41. The inner diameter portion 41a fits onto the side surface 22 of the shaft body 20. Thereby, the inner ring 41 is integrally with the shaft body 20 and can rotate around the axis XC.

[0018] The inner end face 42 extends radially outward from the ends on both axial sides of the inner diameter portion 41a. The inner end face 42 has an inner end face 42a and an inner end face 42b, as shown in FIG. 2. The inner end face 42a faces the +X side. The inner end face 42b faces the -X side.

[0019] The first rolling surface 43 is formed radially outside the inner diameter portion 41a and is annular and faces the radially outside. In the bearing 40 which is a ball bearing, the first rolling surface 43 is substantially semi-circular along the surface of the spherical rolling element 40a in the cross-sectional view shown in FIG. 2.

[0020] The first hole portion 52 is provided so as to open at least at one of the inner end face 42a or the inner end face 42b. The first hole portion 52 is cylindrical and extends uniformly along the axial direction. In the bearing 40 of the embodiment, the first hole portion 52 penetrates from the inner end face 42a toward the inner end face 42b. The first hole portion 52 is disposed radially inside the first rolling surface 43. The multiple first holes 52 are arranged in an annular shape around the axis XC along the annular inner ring 41 at predetermined intervals. The number of the multiple first holes 52 is preferably relatively prime to the number of the multiple rolling elements 40a. In the bearing 40 of this embodiment, as shown in Figure 1, seven first holes 52 are arranged side by side at predetermined intervals.

[0021] The outer ring 44 is annular in shape and is positioned radially outward relative to the inner ring 41, with the rolling elements 40a in between. The outer ring 44 is positioned between the rolling elements 40a and the support 30. The outer ring 44 does not come into contact with the inner ring 41. The outer ring 44 has an outer diameter portion 44a, an outer end face 45, a second rolling surface 47, and a plurality of second holes 54. The outer diameter portion 44a is cylindrical and faces radially outward from the annular outer ring 44. The outer diameter portion 44a fits into the support hole 32 of the support body 30.

[0022] The outer end face 45 extends radially inward from both axial ends of the outer diameter portion 44a. The outer end face 45 has an outer end face 45a and an outer end face 45b. The outer end face 45a faces the +X side. The outer end face 45b faces the -X side.

[0023] The second rolling surface 47 is formed radially inward from the outer diameter portion 44a and is annular in orientation radially inward. In the ball bearing bearing 40, the second rolling surface 47 is approximately semicircular in shape, following the surface of the spherical rolling element 40a in the cross-sectional view shown in Figure 1.

[0024] The second hole 54 is provided to open at least on either the outer end face 45a or the outer end face 45b. The second hole 54 is cylindrical in shape and extends uniformly along the axial direction. In the bearing 40 of this embodiment, the second hole 54 penetrates from the outer end face 45a to the outer end face 45b. The second hole 54 is located radially outward from the second rolling surface 47. Multiple second holes 54 are arranged in an annular shape around the axis XC along the annular outer ring 44 at predetermined intervals. The number of multiple second holes 54 is preferably relatively prime to the number of multiple rolling elements 40a. In the bearing 40 of this embodiment, as shown in Figure 1, thirteen second holes 54 are arranged side by side at predetermined intervals.

[0025] The vibration-damping member 60 is positioned in each of the multiple holes 52, 54. The vibration-damping member 60 has multiple first vibration-damping members 62 and second vibration-damping members 64.

[0026] Multiple first vibration-damping members 62 are arranged in multiple first holes 52 of the inner ring 41. Preferably, the shape of the first vibration-damping members 62 corresponds to the shape of the first holes 52. In this embodiment, the first vibration-damping members 62 are cylindrical in shape and extend uniformly along the axial direction.

[0027] Multiple second vibration-damping members 64 are arranged in multiple second holes 54 of the outer ring 44. Preferably, the shape of the second vibration-damping members 64 corresponds to the shape of the second holes 54. In this embodiment, the second vibration-damping members 64 are cylindrical in shape and extend uniformly along the axial direction.

[0028] The vibration-damping members 62 and 64 are formed of an elastomer. The elastomer is preferably, for example, EPDM (ethylene propylene diene rubber), acrylic rubber (ACM), nitrile rubber (NBR), or fluororubber (FKM). It is preferable that the vibration-damping members 62 and 64 have a tightening allowance with respect to the holes 52 and 54.

[0029] (Mechanism of Action and Effects) Next, the operation and effects of the bearing 40 will be described. The bearing 40 has a vibration isolation member 60 which includes a first vibration isolation member 62 and a second vibration isolation member 64. The vibration of the bearing 40, which is a rolling bearing, is caused by the movement of multiple rolling elements 40a on the rolling surfaces 43 and 47 as the bearing 40 rotates. Vibrations generated by the movement of multiple rolling elements 40a on the first rolling surface 43 are transmitted to the shaft 20 via the inner ring 41. The bearing 40 has a first vibration-damping member 62 positioned in the first hole 52 of the inner ring 41, which can suppress vibrations transmitted from the rolling elements 40a to the inner ring 41. In other words, the bearing 40 can suppress vibrations transmitted from the rolling elements 40a to the shaft 20 via the inner ring 41 by having the first vibration-damping member 62. Vibrations generated by the movement of multiple rolling elements 40a on the second rolling surface 47 are transmitted to the support 30 via the outer ring 44. The bearing 40 has a second vibration-damping member 64 positioned in the second hole 54 of the outer ring 44, which can suppress vibrations transmitted from the rolling elements 40a to the outer ring 44. In other words, the bearing 40 can suppress vibrations transmitted from the rolling elements 40a to the support 30 via the outer ring 44 by having the second vibration-damping member 64. Thus, the vibration damping performance of the bearing 40 can be improved by having a vibration damping member 60 positioned in at least one of the first bore 52 or the second bore 54. In particular, the vibration damping performance of the bearing 40 can be further improved by having vibration damping members 60 provided in both the first bore 52 and the second bore 54.

[0030] The multiple first holes 52 are arranged at predetermined intervals from each other. That is, the multiple first vibration-damping members 62 are arranged at predetermined intervals from each other. Also, the number of multiple rolling elements 40a and the number of multiple first holes 52 are relatively prime. That is, the number of multiple rolling elements 40a and the number of multiple first vibration-damping members 62 are relatively prime. In this case, the inner ring 41 is less likely to resonate with vibrations caused by the movement of the multiple rolling elements 40a on the first rolling surface 43. Therefore, the bearing 40 can further improve vibration damping between the bearing 40 and the shaft 20.

[0031] The multiple second holes 54 are arranged at predetermined intervals from each other. That is, the multiple second vibration-damping members 64 are arranged at predetermined intervals from each other. Furthermore, the number of multiple rolling elements 40a and the number of multiple second holes 54 are relatively prime. That is, the number of multiple rolling elements 40a and the number of multiple second vibration-damping members 64 are relatively prime. In this case, the outer ring 44 is less likely to resonate with vibrations caused by the movement of the multiple rolling elements 40a on the second rolling surface 47. Therefore, the bearing 40 can further improve vibration damping between the bearing 40 and the support 30.

[0032] The holes 52 and 54 are through holes. If the holes formed in the inner ring 41 or outer ring 44, into which a columnar vibration-damping member can be placed, are closed holes, it is difficult to insert the vibration-damping member to the predetermined position. In particular, if the vibration-damping member is made of elastomer and has a tolerance for interference with respect to the hole, it is difficult to insert the vibration-damping member into a closed hole. On the other hand, the bearing 40 has through holes 52 and 54, making it easy to insert the vibration-damping member 60 into the holes 52 and 54. Therefore, the bearing 40 can improve the insertability of the vibration-damping member 60 into the first hole 52 or the second hole 54.

[0033] As described above, an embodiment of the present invention has been explained as an example, but the present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible within the scope of the technical idea of ​​the present invention.

[0034] In the bearing 40 of the embodiment, the holes 52 and 54 are through holes. However, the holes in the present disclosure may be closed holes, as shown in the holes 252 and 254 in Figure 3. In the present disclosure, only one of the first or second holes may be a through hole.

[0035] The bearing 40 in the embodiment has a first hole 52 formed in the inner ring 41 and a second hole 54 formed in the outer ring 44. However, the rolling bearing according to the present disclosure may also have only one of the first hole 52 or the second hole 54, as shown in the bearings 340 and 440 in Figures 4 and 5. The bearing 340 shown in Figure 4 has only the second hole 54. The bearing 340 does not have the first hole 52. The bearing 440 shown in Figure 5 has only the first hole 52. The bearing 440 does not have the second hole 54.

[0036] In the embodiment, the holes 52, 54 and the vibration-damping member 60 are cylindrical in shape, extending uniformly along the axial direction. However, the first hole, the second hole, and the vibration-damping member according to this disclosure are not limited to a uniform cylindrical shape. The first hole, the second hole, and the vibration-damping member according to this disclosure may be frustoconical, as shown in the holes 552, 554 and vibration-damping member 560 in Figure 6. That is, the first hole, the second hole, and the vibration-damping member according to this disclosure may have a configuration in which the diameter at one end along the axial direction is larger than the diameter at the opposite end. In this case, it is preferable that the rolling bearing according to this disclosure has the larger diameter end of the vibration-damping member disposed in the second hole of the outer ring fitted into the support hole 32 so as to face the stepped surface 36 of the support 30. In this case, the rolling bearing according to this disclosure can prevent the vibration-damping member disposed in the second hole from falling off the outer ring. [Explanation of symbols]

[0037] 10 Structure 20 Axis Body 22 Side view 30 Support 30a Exterior 32 Support hole 40. Bearings (an example of rolling bearings) 40a Rolling element 41 Inner circle 41a Inner diameter part 42 Inner end face 43 First rolling surface 44 Outer ring 44a Outer diameter 45 Outer end face 47 Second rolling surface 52 First hole 54 Second hole 60 Vibration Isolator 62 First vibration isolation member 64 Second vibration isolation member

Claims

1. It's an internal matter, An annular first rolling surface facing radially outward, A plurality of first holes are arranged in an annular shape radially inward from the first rolling surface and extend in the axial direction, An inner ring having, An outer ring positioned radially outward from the inner ring, having an annular second rolling surface facing radially inward, Multiple vibration-damping members arranged within the multiple first holes, A rolling bearing having [a certain feature].

2. The system further comprises a plurality of rolling elements arranged in an annular shape at a predetermined interval between the inner ring and the outer ring, The multiple first holes are arranged at predetermined intervals from one another. The rolling bearing according to claim 1, wherein the number of the plurality of rolling elements and the number of the plurality of first holes are relatively prime.

3. The outer ring is arranged in an annular shape radially outward from the second rolling surface and further has a plurality of second holes extending in the axial direction. The rolling bearing according to claim 1 or 2, wherein a plurality of vibration-damping members are further arranged within a plurality of the second holes.

4. An inner ring having an annular first rolling surface facing radially outward, An outer ring arranged radially outward with respect to the inner ring, A second annular rolling surface facing radially inward, Arranged in an annular shape radially outward from the second rolling surface, and comprising a plurality of second holes extending in the axial direction, An outer ring having, Multiple vibration-damping members arranged within the multiple second holes, A rolling bearing having [a certain feature].

5. The system further comprises a plurality of rolling elements arranged in an annular shape at a predetermined interval between the inner ring and the outer ring, The multiple second holes are arranged at predetermined intervals from each other. The rolling bearing according to claim 4, wherein the number of the plurality of rolling elements and the number of the plurality of second holes are relatively prime.

6. The rolling bearing according to any one of claims 1 to 5, wherein at least one of the first hole or the second hole is a through hole.

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