Rolling bearings
The rolling bearing design with elastic fastening members in recesses simplifies the structure and enhances load capacity by using larger rolling elements, facilitating easier installation.
Patent Information
- Application Number
- JP2021204278
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-12-16
- Publication Date
- 2025-12-10
- Estimated Expiration
- 2041-12-16
AI Technical Summary
Existing rolling bearings with split rings require complex fastening methods that reduce the space available for raceways, limiting the size of rolling elements and the load rating.
A rolling bearing design featuring elastic fastening members fitted into recesses on the outer and inner rings, allowing for a simpler structure and larger raceways without securely fixing the split rings, enabling the use of larger rolling elements.
The design achieves a higher load rating with a simpler structure by allowing larger rolling elements and easier installation, while maintaining reliable fixation.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present invention relates to a rolling bearing. [Background technology]
[0002] In a known cross roller bearing, the inner ring is made of a single piece and the outer ring is made of a combination of split rings that are split in the axial direction. As a means for fastening the split rings together, a known method is to form threaded holes that pass through both of the split rings and fasten the split rings together with bolts and nuts that are inserted into the threaded holes (see, for example, Patent Document 1).
[0003] It is also known to use a U-shaped fastening member as a means for fixing the split rings of a cross roller bearing (see, for example, Patent Document 2). In Patent Document 2, each split ring has a semi-elliptical recess, and two through holes are provided in this recess that pass through both split rings. The tip of a U-shaped pin is inserted into the through hole of one of the split rings. Next, the tip of the pin protruding from the through hole of the other split ring is bent and crimped. This fixes the two split rings to each other. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 60-95228 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-303516 Summary of the Invention [Problem to be solved by the invention]
[0005] A rolling bearing with a simpler structure and a higher load rating is desired. Therefore, one of the objects of the present invention is to provide a rolling bearing with a simpler structure and a higher load rating. [Means for solving the problem]
[0006] A rolling bearing according to the present disclosure includes an outer ring having a raceway surface on its inner peripheral surface, an inner ring having a common center axis with the outer ring and a raceway surface on its outer peripheral surface, and a plurality of rolling elements disposed in a raceway formed by the raceway surfaces of the outer ring and the inner ring. The outer ring is composed of a first outer ring member and a second outer ring member assembled in the axial direction. The outer ring has a plurality of recesses radially recessed from the outer peripheral surface, spaced equally apart in the circumferential direction. The recesses include a first portion formed axially on the outer peripheral surface of the outer ring, and a second portion continuous with the first portion and extending radially inward from the outer peripheral surface at an end face of the outer ring. The rolling bearing includes a fastening member fastening the first outer ring member and the second outer ring member together. The fastening member is elastic. The fastening member is fitted into the recesses. [Effects of the Invention]
[0007] According to the above rolling bearing, it is possible to provide a rolling bearing with a simple structure and a large load rating. [Brief explanation of the drawings]
[0008] [Figure 1] FIG. 1 is a plan view showing a rolling bearing according to the present disclosure. [Figure 2] FIG. 2 is a partially enlarged cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a perspective view of a fastening member in a rolling bearing according to the present disclosure. [Figure 4] FIG. 4 is a perspective view of a fastening member in a rolling bearing according to the present disclosure. [Figure 5] FIG. 5 is an enlarged plan view of a portion of a rolling bearing according to the present disclosure. [Figure 6] FIG. 6 is an enlarged cross-sectional perspective view showing a portion of a first outer ring member in a rolling bearing according to the present disclosure. [Figure 7] FIG. 7 is a perspective view showing a rolling bearing according to the present disclosure with some components removed. [Figure 8]FIG. 8 is a plan view showing a rolling bearing according to the present disclosure. [Figure 9] FIG. 9 is a partially enlarged cross-sectional view of a rolling bearing according to the present disclosure. [Figure 10] FIG. 10 is a partially enlarged cross-sectional view of a rolling bearing according to the present disclosure. [Figure 11] FIG. 11 is a partially enlarged cross-sectional view of a rolling bearing according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION
[0009] [Outline of the embodiment] First, embodiments of the present disclosure will be described. A rolling bearing according to the present disclosure includes an outer ring having a raceway surface on its inner peripheral surface, an inner ring having a common center axis with the outer ring and a raceway surface on its outer peripheral surface, and a plurality of rolling elements disposed in a raceway formed by the raceway surfaces of the outer ring and the inner ring. The outer ring is composed of a first outer ring member and a second outer ring member assembled in the axial direction. The outer ring has a plurality of recesses radially recessed from the outer peripheral surface, spaced equally apart in the circumferential direction. The recesses include a first portion formed axially on the outer peripheral surface of the outer ring, and a second portion continuous with the first portion and extending radially inward from the outer peripheral surface at an end face of the outer ring. The rolling bearing includes a fastening member fastening the first outer ring member and the second outer ring member together. The fastening member is elastic. The fastening member is fitted into the recesses.
[0010] Conventionally, rolling bearings have been known in which the outer or inner ring is composed of two axially separated members (also referred to as split rings). Various means have been proposed for fastening the split rings together. For rolling bearings with split outer rings, a method is known in which a threaded hole is formed in each split ring and the split rings are fastened together using bolts and nuts (see, for example, Patent Document 1). The threaded holes are formed radially outward from the position where the raceway surface is formed to avoid interference with the raceways of the rolling elements. In other words, the diameter of the outer ring is made larger to ensure space for forming the threaded holes. Therefore, compared to rolling bearings with integrally molded outer rings of the same outer diameter, rolling bearings composed of split rings have less space for forming the raceways of the rolling elements. This necessitates the use of smaller rolling elements that can be inserted into the raceways, which can limit the load rating.
[0011] When the split rings are fastened together by inserting pins instead of bolts and nuts, the area occupied by the structure for fastening the split rings can be smaller than when bolts and nuts are used (for example, Patent Document 2). However, the configuration of forming a recess, forming a through hole above it, inserting a pin, and crimping the end was not necessarily simple.
[0012] Under these circumstances, a simpler, space-saving fixing structure for the split rings was investigated. While it was previously thought necessary to securely fix the split rings with a high fastening force to prevent them from moving, the idea was reached that this is not essential. Based on this idea, a structure was considered in which recesses are provided in each split ring and elastic fastening members are fitted into the recesses to hold the split rings together. Specifically, the idea was reached that the recesses would include a first portion formed along the axial direction of the outer peripheral surface and a second portion that is continuous with the first portion and extends radially inward from the outer periphery at the end face of the outer ring, with the fastening member fitted into the recess.
[0013] The rolling bearing according to the present disclosure has a structure in which elastic fastening members are fitted into recesses extending on the outer circumferential surface and end surface of the split ring, simplifying the structure for fixing the split ring. Furthermore, the structure for fixing the split ring occupies a small amount of space. This structure allows for a larger raceway to be formed even with the same outer diameter, compared to when split rings are fixed with bolts and nuts. This allows for the insertion of larger rolling elements, resulting in a rolling bearing with a high load rating.
[0014] Furthermore, the rolling bearing according to the present disclosure may have a divided inner ring. That is, the inner ring of the rolling bearing may be composed of a first inner ring member and a second inner ring member assembled in the axial direction. The inner ring may have a plurality of recesses radially recessed from the inner peripheral surface, spaced at equal intervals in the circumferential direction. The recesses may include a first portion formed axially on the inner peripheral surface of the inner ring, and a second portion continuous with the first portion and extending radially outward from the inner peripheral surface at an end face of the inner ring. The rolling bearing may include a fastening member fastening the first inner ring member and the second inner ring member together. The fastening member is elastic and is fitted into the recesses of the first inner ring member and the second inner ring member.
[0015] In the rolling bearing described above, the split rings can be secured in a simple structure, just as in the case of a split outer ring. Furthermore, the structure for securing the split rings requires a small area. Therefore, compared to rolling bearings in which split rings are secured with bolts and nuts, a larger raceway can be used for the same dimensions, allowing for the insertion of larger rolling elements, resulting in a rolling bearing with a higher load rating.
[0016] The recess may further include a third portion continuous with the second portion. The third portion may be a portion extending axially from an end face of the outer ring or the inner ring. The fastening member may be a single member that is fitted into the recess by its own elasticity. This structure allows the split rings to be held together more reliably.
[0017] In the rolling bearing, the width W4 of the recess and the width L4 of the fastening member are W4 = L4 × (1 + n) (n = 0.2 to 1.5) may satisfy the following relationship. This relational expression means that the width W4 of the recess is 20 to 150% larger than the width L4 of the fastening member. By making the width of the recess larger than the width of the fastening member, the split rings can move slightly while still being held together. This makes it easier to fit the split rings into the installation location when installing and fixing the rolling bearing to an external component (such as a bearing housing for an external device). Conventionally, the split rings have been designed to be completely fixed together and immovable. In contrast, the present disclosure allows the split rings to move slightly. This configuration makes it easy and reliable to install the rolling bearing in the external device.
[0018] The first outer ring member and the second outer ring member may have the same shape, and the rolling bearing may be symmetrical with respect to a plane perpendicular to the axial direction and passing through the center in the axial direction. Also, the first inner ring member and the second inner ring member may have the same shape, and be symmetrical with respect to a plane perpendicular to the axial direction and passing through the center in the axial direction. With this configuration, a rolling bearing can be obtained that can be used regardless of whether it is top or bottom, has high symmetry, and is less likely to suffer from eccentric misalignment.
[0019] [Specific example of embodiment] Next, an example of a specific embodiment of the rolling bearing of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.
[0020] (Embodiment 1) Fig. 1 is a plan view showing a rolling bearing 1 according to the present disclosure, and Fig. 2 is a partially enlarged cross-sectional view showing the II-II cross section in Fig. 1.
[0021] An overview of the rolling bearing 1 will first be described with reference to Figure 1. The rolling bearing 1 mainly comprises an annular outer ring 10, an annular inner ring 20, and rollers 30 as multiple rolling elements inserted between the outer ring 10 and the inner ring 20. The outer ring 10 and the inner ring 20 share a common central axis R. The direction in which the central axis R extends is called the axial direction. The rollers 30 are cylindrical rollers. The rollers 30 include first rollers 31 and second rollers 32 arranged alternately. The rollers 30 are arranged so that the rolling axes of adjacent first rollers 31 and second rollers 32 are perpendicular to each other. The rolling bearing 1 is a cross roller bearing.
[0022] The outer ring 10 is provided with recesses 50 recessed radially from the outer peripheral surface 10e. The recesses 50 are provided in three locations, equally spaced apart in the circumferential direction. Note that in the example shown in FIG. 1, there are three recesses 50, but the number of recesses can be changed depending on the dimensions of the rolling bearing, etc. For example, two to eight recesses may be provided. Fastening members 40, 400 are fitted into the recesses 50. For ease of understanding, FIG. 1 shows a state in which no fastening member is fitted into one of the recesses 50, but it is preferable that fastening members are fitted into all of the recesses. In some cases, as shown in FIG. 1, a configuration in which no fastening member is fitted into some of the recesses may be used.
[0023] Referring to FIG. 2, the outer ring 10 is composed of a first outer ring member 11 and a second outer ring member 12, which are two split rings separated in the axial direction. The outer ring 10 has a first raceway surface 11a and a second raceway surface 12a on its inner circumferential surface. The first outer ring member 11 has the first raceway surface 11a. The second outer ring member 12 has the second raceway surface 12a. Meanwhile, the inner ring 20 is composed of a single, integrally formed part. The inner ring 20 has a third raceway surface 21a and a fourth raceway surface 22a on its outer circumferential surface. The annular space defined by the first raceway surface 11a, the second raceway surface 12a, the third raceway surface 21a, and the fourth raceway surface 22a forms the orbit of the roller 30.
[0024] In the cross section shown in Figure 2 (a cross section perpendicular to the tangent direction of the circumference of the rolling bearing 1), the imaginary line connecting the first raceway surface 11a and the fourth raceway surface 22a over the shortest distance and the imaginary line connecting the second raceway surface 12a and the third raceway surface 21a over the shortest distance are perpendicular to each other. The first roller 31 has a rolling surface 31a shaped like a cylindrical side surface. The rolling surface 31a contacts the second raceway surface 12a and the third raceway surface 21a, and the first roller 31 rolls on the second raceway surface 12a and the third raceway surface 21a. Although not shown, the second roller 32 similarly rolls on the first raceway surface 11a and the fourth raceway surface 22a.
[0025] There are no limitations on the manner in which the rolling bearing 1 is used, but it can be used, for example, in a configuration in which the outer ring 10 is fixed to a bearing housing of an external device and the inner ring 20 rotates under external force. Alternatively, it may be used in a configuration in which the inner ring 20 is fixed to a housing of an external device and the outer ring 10 rotates under external force.
[0026] The fastening structure of the outer ring 10 will now be described. The first outer ring member 11 and the second outer ring member 12 are held together by a fastening member 40 so that they do not separate from each other. The fastening member 40 is fitted into a recess 50 formed in the outer ring 10.
[0027] The recess 50 is formed across the first outer ring member 11 and the second outer ring member 12. The recess 50 is recessed radially from the outer peripheral surface 10e of the outer ring 10. The recess 50 includes a first portion 51, a second portion 52, and a third portion 53. The first portion 51 and the third portion 53 extend in the axial direction. The second portion 52 extends radially.
[0028] The recess 50 includes a first portion 51 formed along the axial direction of the outer ring 10. Here, "along the axial direction" means "from one end of the axial direction to the other," or in other words, "from the first end face 10a to the second end face 10b of the outer ring 10." The first portion 51 is a recess recessed radially from the outer peripheral surface 10e. A second portion 52 is continuous with both ends of the first portion 51. The second portion 52 is a recess extending linearly radially inward from the outer peripheral surface 10e at each of the first end face 10a and the second end face 10b of the outer ring 10. A third portion 53 is continuous with the end of the second portion 52 opposite the side connected to the first portion 51. The third portion 53 is a recess extending axially inward from each of the first end face 10a and the second end face 10b.
[0029] The fastening member 40 is fitted into the recess 50. The fastening member 40 is a one-piece member having elasticity. The fastening member 40 may be, for example, a metal or resin member. The fastening member 40 fits along the inner wall surface of the recess 50. In addition, the claw portion 43 of the fastening member 40 engages with the third portion 53 of the recess 50.
[0030] The fastening member 40 will now be described. FIG. 3 is a perspective view of the fastening member 40. Referring to FIG. 3, the fastening member 40 is a bent cylindrical member having a constant diameter. A cross section of the fastening member 40 perpendicular to the longitudinal direction is substantially circular. The fastening member 40 includes a linearly extending shaft portion 41, engaging portions 42 extending from both ends of the shaft portion 41, and claw portions 43 extending from the ends of the engaging portions 42. The length L1 of the shaft portion 41 is slightly smaller than the axial dimension W1 (FIG. 2) of the rolling bearing 1. Therefore, the fastening member 40 does not protrude axially outward from the end faces 10a, 10b of the rolling bearing 1. The length L2 of the engaging portions 42 is not particularly limited, but can be, for example, approximately 1.5 mm to 6 mm. The length L3 of the claw portions 43 is also not particularly limited, but can be, for example, approximately 1 mm to 4 mm. With the engaging portions 42 and the claw portions 43 having such shapes and lengths, the first outer ring member 11 and the second outer ring member 12 are held together so that they do not separate during transportation or the like.
[0031] FIG. 4 is a perspective view of fastening member 400. Like fastening member 40, fastening member 400 is a fastening member included in the rolling bearing according to the present disclosure. Referring to FIG. 4, fastening member 400 is a bent prismatic member having a generally uniform outer shape. The cross section perpendicular to the longitudinal direction of fastening member 40 is rectangular. Fastening member 400 has the same configuration as fastening member 40, except for the cross-sectional shape, which differs from fastening member 40. Fastening member 400 includes a shaft portion 401, engaging portions 402 extending from both ends of shaft portion 401, and claw portions 403 extending from the ends of engaging portions 402. Length L of shaft portion 401 10 is slightly smaller than the axial dimension W1 (FIG. 2) of the rolling bearing 1. 20 The length L of the claw portion 403 can be set to the same value as the length L2 (FIG. 3). 30 can be made in the same way as length L3 (Fig. 3).
[0032] Each of the fastening members 40, 400 has elasticity due to its material and shape. With reference to FIGS. 2 to 4, the fastening members 40, 400 are fitted into the outer ring 10 as follows. First, the first outer ring member 11 and the second outer ring member 12 are properly aligned and held in the circumferential direction so that the recesses formed in the first outer ring member 11 and the second outer ring member 12 are aligned. In this state, the fastening members 40, 400 are elastically deformed by being pushed open, and fitted into the recesses 50. When released, the fastening members 40, 400 attempt to return to their original shape, fitting into the second portion 52 of the recesses 50 and then engaging with the third portion 53 of the recesses 50. In the rolling bearing 1, the fastening members fitted into the multiple recesses 50 may all be the same, or fastening members of different shapes or dimensions may be arranged.
[0033] FIG. 5 is an enlarged partial plan view of the first end face 10a of the rolling bearing 1. Referring to FIG. 5, a fastening member 400 is fitted into a recess 50 of the outer ring 10. The circumferential opening width W4 of the recess 50 is slightly larger than the width L4 of the fastening member 400. In the example of FIG. 5, the opening width W4 is 1.5 mm, and the width L4 of the fastening member 400 is 1 mm. Naturally, the specific dimensions are not limited to these, and the opening width W4 can be approximately 20 to 150% larger than the width L4 of the fastening member 400. In other words, the opening width W4 and the width L4 of the fastening member are W4 = L4 × (1 + n) (n = 0.2 to 1.5) The following relationship may be satisfied.
[0034] 2 and 5, the rolling bearing 1 according to the present disclosure uses an elastic fastening member. The circumferential opening width W4 of the recess 50 is slightly larger than the width L4 of the fastening member 400. These configurations allow the first outer ring member 11 and the second outer ring member 12 to move slightly when the rolling bearing 1 is fixed to an external member (e.g., a housing for an external device) to fit onto the external member. In conventional rolling bearings with split rings, the split rings are securely fastened together to prevent movement. Alternatively, when attaching the rolling bearing to an external member, the fastening members are loosened to facilitate fitting the bearing to the external member. In contrast, the rolling bearing according to the present disclosure does not require loosening the fastening members and can fit onto the external member as is.
[0035] The outer ring 10 of the rolling bearing 1 will now be described in more detail. Fig. 6 is a cross-sectional perspective view showing an enlarged view of a portion of the first outer ring member 11. Referring to Fig. 6, the first outer ring member 11 has a first raceway surface 11a on its inner peripheral surface. The first outer ring member 11 has a recess 50 on its outer peripheral surface 11e. The length w2 of the second portion 52 of the recess 50 extending radially from the outer peripheral surface 11e is e The radial depth of the first raceway surface 11a formed on the inner peripheral surface 11i is w6. The radial depth w6 of the first raceway surface 11a is approximately half the diameter w of the outer ring 10. e2 and 6, recess 50 has a first portion 51 formed in outer peripheral surface 10e of outer ring 10, and a second portion 52 formed in end faces 10a, 10b of outer ring 10. Furthermore, it is sufficient that third portion 53 of recess 50 is engaged with claw portion 43 of fastening member 40. For this reason, in the rolling bearing 1 according to the present disclosure, recess 50 can be provided without interfering with first raceway surface 11a and second raceway surface 12a.
[0036] In the outer ring 10, the first outer ring member 11 and the second outer ring member 12 may have the same shape. This results in a rolling bearing that is symmetrical about a plane passing through the center in the axial direction, with no distinction between front and back. In manufacturing the rolling bearing 1, the first outer ring member 11 and the second outer ring member 12 may be manufactured separately. In other words, after producing multiple (many) outer ring members without specifying a combination, two outer ring members may be combined arbitrarily to assemble the rolling bearing. It is preferable that the rolling bearing according to the present disclosure has a small diameter, specifically a cross roller bearing with an outer diameter of approximately 20 to 200 mm.
[0037] (Manufacturing of rolling bearings) FIG. 7 is a perspective view showing the rolling bearing 1 excluding some components including the first outer ring member 11. The rolling bearing 1 is manufactured, for example, by the following procedure. That is, an inner ring having a predetermined shape, a plurality of rollers, and two outer ring members each having a recessed portion on its outer circumferential surface are prepared. As mentioned above, any two outer ring members can be selected and used from a large number of outer ring members manufactured without specifying a combination.
[0038] Next, assembly is performed. Referring to Figure 7, the inner ring 20 is combined with one of the outer ring members (the second outer ring member 12 in Figure 7), and the first rollers 31 and the second rollers 32 are arranged alternately. Next, the first outer ring member is placed over the first outer ring member, and the circumferential positions of the recesses in the first and second outer ring members are aligned. Next, fastening members are fitted into the recesses. The manufacture of a rolling bearing according to the present disclosure does not need to include a step of grinding the raceway surfaces while the outer ring members are combined and fixed.
[0039] (Embodiment 2) FIG. 8 is a plan view of a rolling bearing 100 according to a second embodiment of the present disclosure. In the rolling bearing 100, the outer ring 15 is formed as a single component. The inner ring 25 is formed by combining inner ring members that are divided in the axial direction. The inner periphery of the inner ring 25 is provided with a plurality of recesses 500 that are spaced equally apart in the circumferential direction and are recessed radially from the inner circumferential surface. The recesses 500 have the same configuration as the recesses 50 described above, except that they are provided on the inner periphery of the inner ring 25. A fastening member 40 is fitted into the recesses 500.
[0040] (Variation) The rolling bearing according to the present disclosure can be modified in various ways in addition to the above-described embodiments. For example, the shapes of the recess and the fastening member may be modified. For example, FIG. 9 is a partially enlarged cross-sectional view of a rolling bearing 110, which is a modified example of the rolling bearing 1. Referring to FIG. 9, the rolling bearing 110 differs from the rolling bearing 1 in the shapes of the recess 150 and the fastening member 140. The differences will be described below. In the rolling bearing 110, the second portion 152 of the recess 150 extends radially inward from the outer circumferential surface. The inner surface 152a of the second portion 152 extends from the outer circumferential side toward the inner circumferential side, away from the central plane in the axial direction of the rolling bearing 110. The inner surface 153a of the third portion 153 of the recess 150 extends from the outer circumferential side toward the inner circumferential side, approaching the central plane. The fastening member 140 is fitted into the recess 150. The fastening member 140 is made up of a shaft portion 141, an engaging portion 142 extending diagonally outward relative to the shaft portion 141, and a claw portion 143 extending inward perpendicular to the engaging portion 142.
[0041] FIG. 10 is a partially enlarged cross-sectional view of rolling bearing 210, a modified example of rolling bearing 1. Referring to FIG. 10, rolling bearing 210 differs from rolling bearing 1 in the shapes of recessed portion 250 and fastening member 240. The differences will be explained below. In rolling bearing 210, second portion 252 of recessed portion 250 is a portion that extends radially inward from the outer circumferential surface. An inner surface 252a of second portion 252 is a semicircular arc surface that juts out toward end faces 10a, 10b of rolling bearing 210. Third portion 253 is continuous with second portion 252 and extends axially inward of rolling bearing 210. Fastening member 240 is fitted into recessed portion 250. The fastening member 240 is made up of a shaft portion 241 , a semicircular arc-shaped engaging portion 242 , and a claw portion 243 that is continuous with the engaging portion 242 and extends parallel to the shaft portion 241 .
[0042] FIG. 11 is a partially enlarged cross-sectional view of a rolling bearing 310, a modified example of the rolling bearing 1. Referring to FIG. 11, the rolling bearing 310 differs from the rolling bearing 1 in the shapes of the recess 350 and the fastening member 340. The second portion 352 of the recess 350 extends radially inward from the outer circumferential surface. The inner surface 352a of the second portion 352 extends from the outer circumferential side toward the inner circumferential side, approaching the center plane of the rolling bearing 310 in the axial direction. The rolling bearing 310 does not have a portion equivalent to the third portion of the recess 50 of the rolling bearing 1. A fastening member 340 is fitted into the recess 350. The fastening member 340 comprises a shaft portion 341 and an engaging portion 342 that is bent inward at an acute angle relative to the shaft portion 341. The fastening member 340 does not have a portion equivalent to the claw portion 43 of the fastening member 40 of the rolling bearing 1. In the case of lightweight rolling bearings or the like, when a small fastening force for holding the outer ring members together is acceptable, the outer ring members can be held together with a simpler structure.
[0043] The number and dimensions of the recesses and fastening members can be changed to suit the overall dimensions of the rolling bearing and the required holding force. The rolling bearing is not limited to a cross roller bearing, and the rolling elements may be balls.
[0044] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present invention is defined not by the above description but by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]
[0045] 1, 100, 110, 210, 310 Rolling bearing, 10, 15 Outer ring, 10a First end face, 10b Second end face, 10e Outer peripheral surface, 11 First outer ring member, 11a First raceway surface, 11e Outer peripheral surface, 11i Inner peripheral surface, 12 Second outer ring member, 12a Second raceway surface, 20, 25 Inner ring, 21a Third raceway surface, 22a Fourth raceway surface, 30 Roller, 31 First roller, 31a Rolling surface, 32 Second roller, 40, 140, 240, 340, 400 Fastening member, 41, 141, 241, 341, 401 Shaft portion, 42, 142, 242, 342, 402 Engagement portion, 43, 143, 243, 403 Claw, 50, 150, 250, 350, 500 Recess, 51, 151, 251, 351 First part, 52, 152, 252, 352 Second part, 53, 153, 253 Third part.
Claims
1. an outer ring having a raceway surface on its inner circumferential surface; an inner ring having a common center axis with the outer ring and having a raceway surface on its outer peripheral surface; a plurality of rolling elements disposed in a raceway formed by a raceway surface of the outer ring and a raceway surface of the inner ring, The outer ring is The outer ring member is configured by a first outer ring member and a second outer ring member that are combined in the axial direction, a plurality of recesses provided at equal intervals in the circumferential direction and recessed radially from the outer circumferential surface; The recessed portion is a first portion formed on an outer peripheral surface of the outer ring along the axial direction; a second portion continuous with the first portion and extending radially inward from the outer peripheral surface at an end face of the outer ring; a third portion that is continuous with the second portion and extends from an end face of the outer ring along the axial direction; comprising the rolling bearing includes a fastening member that fastens the first outer ring member and the second outer ring member to each other, The fastening member is an elastic, one-piece member, The fastening member is fitted into the recess by elasticity of the fastening member, and claw portions at both ends of the fastening member are engaged with the third portion. Rolling bearing.
2. an outer ring having a raceway surface on its inner circumferential surface; an inner ring having a common center axis with the outer ring and having a raceway surface on its outer peripheral surface; a plurality of rolling elements disposed in a raceway formed by a raceway surface of the outer ring and a raceway surface of the inner ring, The inner ring is The bearing is configured by a first inner ring member and a second inner ring member that are combined in the axial direction, a plurality of recesses provided at equal intervals in the circumferential direction and recessed radially from the inner circumferential surface; The recessed portion is a first portion formed on an inner peripheral surface of the inner ring along the axial direction; a second portion continuous with the first portion and extending radially outward from the inner circumferential surface at an end face of the inner ring; a third portion that is continuous with the second portion and extends from an end face of the inner ring along the axial direction; comprising the rolling bearing includes a fastening member that fastens the first inner ring member and the second inner ring member to each other, The fastening member is an elastic, one-piece member, The fastening member is fitted into the recess by elasticity of the fastening member, and claw portions at both ends of the fastening member are engaged with the third portion. Rolling bearing.
3. The circumferential width W of the recess ４ and the width L of the fastening member ４ teeth W ４ =L ４ × (1 + n) (where n = 0.2 to 1.5) Satisfy the relationship of 3. The rolling bearing according to claim 1 or 2.
4. the first outer ring member and the second outer ring member have the same shape and are symmetrical with respect to a plane passing through the center in the axial direction; 2. The rolling bearing according to claim 1.
5. The first inner ring member and the second inner ring member have the same shape and are symmetrical with respect to a plane passing through the center in the axial direction.
3. The rolling bearing according to claim 2.
Citation Information
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