Coupling structure and coupling method
The bonding structure and method provide secure bonding without deforming the components, enabling hardening treatments and enhancing the structural integrity and performance of bonded parts.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MINEBEAMITSUMI INC
- Filing Date
- 2025-12-01
- Publication Date
- 2026-06-11
Smart Images
Figure JP2025041855_11062026_PF_FP_ABST
Abstract
Description
Bonding Structure and Bonding Method 【0001】 The present invention relates to a bonding structure and a bonding method. 【0002】 For example, Patent Document 1 discloses a hub unit for vehicle support. In this hub unit, the inner ring is fixed to the hub by crimping a part of the hub. 【0003】 Japanese Patent Application Laid-Open No. 2005-140177 【0004】 In this hub unit, since it is necessary for a part of the hub to be plastically deformed by crimping, for example, a quenching treatment for hardening cannot be performed on the crimping part. 【0005】 Therefore, an object of the present invention is to provide a bonding structure and a bonding method that do not require deformation of the bonding target itself. 【0006】 A bonding structure according to an aspect of the present invention is an annular first member around an axis, having a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting an end surface on one side in the axial direction, and a second circumferential groove extending in the circumferential direction on the first circumferential surface adjacent to the first circumferential groove on the other side in the axial direction and deeper than the first circumferential groove in the radial direction; a second member annular around the axis, having a second circumferential surface facing the first circumferential surface; and an intermediate member disposed in the first circumferential groove and the second circumferential groove, having a first crimping portion crimped toward the second circumferential groove, and a second crimping portion crimped toward a recess extending in the circumferential direction between an end surface on one side in the axial direction of the second member and the second circumferential surface. 【0007】A coupling method according to one aspect of the present invention is a coupling method for coupling an annular first member with an annular axis to an annular second member with an annular axis, wherein the first member has a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting the end face on one side in the axial direction, and a second circumferential groove extending in the circumferential direction on the first circumferential surface adjacent to the first circumferential groove on the other side in the axial direction, and being deeper in the radial direction than the first circumferential groove, and the second member has a second circumferential surface facing the first circumferential surface when coupled to the first member, and includes the steps of placing an intermediate product in the first circumferential groove and the second circumferential groove and crimping the intermediate product toward the second circumferential groove, and inserting the second member in the axial direction along the first circumferential surface of the first member, and crimping the intermediate product toward a recess extending in the circumferential direction between the end face on one side in the axial direction of the second member and the second circumferential surface. 【0008】 According to the present invention, it is possible to provide a bonding structure and bonding method that do not require deformation of the objects to be bonded. 【0009】 This is a schematic end view showing the structure of a hub bearing 1 according to a specific example. This is a partially enlarged end view showing an enlarged view of the area including the retaining ring 21 in Figure 1. This is a partially enlarged end view for explaining the method of connecting the retaining ring 21 to the inner ring 20. This is a partially enlarged end view for explaining the method of connecting the retaining ring 21 to the inner ring 20. This is a partially enlarged end view for explaining the method of connecting the retaining ring 21 to the inner ring 20. 【0010】Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. Figure 1 is a schematic end view showing the structure of a hub bearing 1 according to one specific example. Figure 1 schematically shows the structure on one side with respect to the axis x, which is an end face along a plane containing the axis x. The axis x is the rotation axis of the hub bearing 1. The hub bearing 1 is installed in a vehicle such as an automobile and supports a wheel so that it can rotate freely in an axle or suspension system. The hub bearing 1 is attached to the vehicle body, for example, via a suspension arm. The wheel includes a tire and a wheel. The hub bearing 1 is a so-called outer ring rotating type hub bearing. 【0011】 In the hub bearing 1 shown in Figure 1, the outer side of one side in the direction along the axis x (hereinafter referred to as the "axial direction") is defined as the tire side TS, and the inner side opposite to the tire side TS along the axis x is defined as the vehicle side BS. In this example, in Figure 1, the left side is the tire side TS and the right side is the vehicle side BS. Furthermore, in the direction perpendicular to the axis x (hereinafter referred to as the "radial direction"), the direction approaching the axis x is defined as the inner circumference side IS, and the direction moving away from the axis x, opposite to the inner circumference side IS, is defined as the outer circumference side OS. The direction around the axis x is defined as the circumferential direction. 【0012】 The hub bearing 1 comprises an inner member 2, an outer member 3, and a plurality of rolling elements 4 that support the inner member 2 and the outer member 3 so that they can rotate relative to each other. The inner member 2 has an annular inner ring 20 about an axis x, and a retaining ring 21 coupled to the inner ring 20 and supporting the plurality of rolling elements 4 between itself and the inner ring 20 in the axial direction. The inner ring 20 has an inner ring body 22 that extends cylindrically along the axis x, and a disc portion 23 that extends annularly from the outer circumferential surface of the inner ring body 22 to the outer circumferential side OS. The inner ring 20 and the retaining ring 21 are formed from a metallic material. The metallic material has, for example, an HRC (Rockwell hardness, scale C) of 30 or more, preferably 40 or more. As will be described later, the retaining ring 21 is coupled to the inner ring 20 by crimping. 【0013】An inner rolling surface 24 extending circumferentially around the axis x is formed on the outer circumferential surface of the inner ring 20 and the outer circumferential surface of the retaining ring 21. The inner rolling surface 24 is concave inward from the outer circumferential surface of the inner ring 20 and the outer circumferential surface of the retaining ring 21 toward the inner circumferential side IS. The inner rolling surface 24 has an inner rolling surface 24a formed on the outer circumferential surface of the inner ring 20 and an inner rolling surface 24b formed on the outer circumferential surface of the retaining ring 21. The inner rolling surface 24a of the inner ring 20 is in contact with a plurality of rolling elements 4a on the vehicle body side BS. On the other hand, the inner rolling surface 24b of the retaining ring 21 is in contact with a plurality of rolling elements 4b on the tire side TS. 【0014】 The outer member 3 is configured to cover the inner member 2 in the circumferential direction. In this example, the outer member 3 has an inner cylinder portion 30, a disc portion 31, an outer cylinder portion 32, and an outer ring 33. The inner cylinder portion 30 extends cylindrically along the axis x. The inner cylinder portion 30 is inserted into the inner ring 20 of the inner member 2. The outer circumferential surface of the inner cylinder portion 30 faces the inner circumferential surface of the inner ring 20. That is, an annular gap is formed between the outer circumferential surface of the inner cylinder portion 30 and the inner circumferential surface of the inner ring 20. A drive shaft, which is a rotating shaft, is inserted into the inner cylinder portion 30. 【0015】 The disc portion 31 extends annularly from the tire-side TS end of the inner cylinder portion 30 outward. The disc portion 31 has a circular shape in the axial direction. The disc portion 31 is positioned closer to the tire-side TS than the inner member 2. In other words, the inner member 2 is positioned closer to the vehicle body BS than the disc portion 31. In this example, in the axial direction, the side surface of the vehicle body BS of the disc portion 31 faces the retaining ring 21 and the inner ring body 22 of the inner member 2. The disc portion 31 is provided with, for example, a plurality of bolt holes (not shown). The wheel is fixed to the disc portion 31 by tightening a plurality of bolts that pass through the through hole of the wheel into these bolt holes. 【0016】The outer cylinder portion 32 extends from the outer peripheral OS of the disc portion 31 to the vehicle body side BS. The outer cylinder portion 32 extends in a cylindrical shape along the axis x. The inner cylinder portion 30, the disc portion 31, and the outer cylinder portion 32 are integrally formed from a metal material. Similarly, the outer ring 33 is also formed from a metal material. The metal material has, for example, an HRC (Rockwell hardness, scale C) of 30 or more, preferably 40 or more. An annular stepped portion 34 is formed on the inner circumferential surface of the outer cylinder portion 32 around the axis x. The annular outer ring 33 is coupled to this stepped portion 34 around the axis x. The end face 33a of the outer ring 33 facing the tire side TS faces or abuts against the end face 34a of the stepped portion 34 facing the vehicle body side BS. In this example, the end faces 33a and 34a spread out in an annular shape along a plane perpendicular to the axis x. 【0017】 In the radial direction, an annular space is formed between the outer circumferential surface of the inner cylinder portion 30 and the inner circumferential surface of the outer ring 33. That is, the outer ring 33 faces the inner ring 20 from the outer circumferential side OS. An outer rolling surface 35 is formed on the inner circumferential surface of the outer ring 33, extending in the circumferential direction around the axis x. The outer rolling surface 35 has two outer rolling surfaces 35a and 35b that are concavely recessed from the inner circumferential surface of the outer ring 33 toward the outer circumferential side OS. The outer rolling surface 35a faces the inner rolling surface 24a in the radial direction. The outer rolling surface 35b also faces the inner rolling surface 24b in the radial direction. The outer rolling surface 35a is in contact with a plurality of rolling elements 4a on the vehicle body side BS. On the other hand, the outer rolling surface 35b is in contact with a plurality of rolling elements 4b on the tire side TS. 【0018】The multiple rolling elements 4a and 4b are, for example, steel balls or ceramic balls. Multiple rolling elements 4a are arranged between the inner rolling surface 24a and the outer rolling surface 35a. These multiple rolling elements 4a are arranged in the circumferential direction to form an annular row of rolling elements. Similarly, multiple rolling elements 4b are arranged between the inner rolling surface 24b and the outer rolling surface 35b. These multiple rolling elements 4b are arranged in the circumferential direction to form an annular row of rolling elements. Due to the action of the outer ring 33, the multiple rolling elements 4a are spaced apart in the axial direction from the multiple rolling elements 4b. In this way, the multiple rolling elements 4a and 4b support the inner ring 20 and the retaining ring 21, i.e., the inner member 2, and the inner cylinder portion 30, the disc portion 31, the outer cylinder portion 32, and the outer ring 33, i.e., the outer member 3, so that they can rotate relative to each other. 【0019】 An annular stepped portion 25 is formed around the axis x at the tire-side TS end of the inner ring body 22 of the inner ring 20. The stepped portion 25 is formed on the outer circumferential surface of the inner ring body 22. The retaining ring 21 is joined to this stepped portion 25, for example, by press-fitting. The stepped portion 25 has an end face 25a defined on the vehicle body side BS and a circumferential surface 25b defined on the tire-side TS. The end face 25a is a surface that includes a curved surface defined, for example, by rotating a quarter circle on the end face containing the axis x around the axis x. The circumferential surface 25b is a cylindrical surface defined around the axis x. In this example, the end face 25a and the circumferential surface 25b are continuous with each other. 【0020】 The retaining ring 21 has end faces 21a and circumferential surfaces 21b that correspond to the end face 25a and circumferential surface 25b of the stepped portion 25, respectively. End face 21a has a shape that corresponds to the end face 25a of the stepped portion 25. Also, circumferential surface 21b has a shape that corresponds to the circumferential surface 25b of the stepped portion 25. The retaining ring 21 faces or abuts against the end face 25a of the stepped portion 25 at its end face 21a. When the retaining ring 21 is coupled to the stepped portion 25 in this way, the retaining ring 21 applies preload to the multiple rolling elements 4b toward the vehicle body side BS. The annular space formed between the inner member 2 and the outer member 3 is filled with grease (not shown) such as a lubricant. This space is sealed by a plurality of sealing devices (not shown) arranged between the inner member 2 and the outer member 3. 【0021】Next, a coupling structure 5 according to one embodiment of the present invention will be described. Figure 2 is a partially enlarged end view showing an enlarged area including the retaining ring 21 in Figure 1. Figure 2 shows the end face of the coupling structure 5 along a plane containing the axis x. The coupling structure 5 is a coupling structure that connects the retaining ring 21 (second member) to the inner ring 20 (first member). The inner ring body 22 has an annular flange portion 26 extending toward the tire side TS around the axis x. The thickness of the flange portion 26 defined in the radial direction is smaller than the thickness of the inner ring body 22 defined in the radial direction. The flange portion 26 has an end face 26a facing the tire side TS. In this example, the end face 26a extends along a virtual plane perpendicular to the axis x. 【0022】 The circumferential surface 25b of the stepped portion 25 is defined, for example, by a cylindrical surface perpendicular to the end face 26a of the flange portion 26. The circumferential surface 25b of the stepped portion 25 has a first circumferential groove 50 extending in the circumferential direction and a second circumferential groove 51 extending in the circumferential direction adjacent to the first circumferential groove 50 on the vehicle body side BS in the axial direction. The depth D2 of the second circumferential groove 51 defined in the radial direction from the circumferential surface 25b is defined to be greater than the depth D1 of the first circumferential groove 50 defined in the radial direction from the circumferential surface 25b. In this example, it is preferable that the second circumferential groove 51 is formed in the region of the inner ring body 22 rather than the region of the flange portion 26 in the axial direction. The first circumferential groove 50 and the second circumferential groove 51 face the circumferential surface 21b of the retaining ring 21. 【0023】 An annular recess 27 extending in the circumferential direction is formed between the end face 26a of the flange portion 26 and the first circumferential groove 50. The recess 27 is recessed from the end face 26a of the flange portion 26 toward the vehicle body side BS. In this example, the recess 27 is defined as a frustoconical surface with axis x as its central axis, which widens toward the outer circumference OS as it moves from the end face 26a toward the vehicle body side BS. The recess 27 may also be defined as a curved surface that recesses toward the inner circumference IS, or as a curved surface that protrudes toward the outer circumference OS, as long as it is recessed from the end face 26a toward the vehicle body side BS. Furthermore, the recess 27 may be defined as a surface of other shapes, for example, a surface with a step. 【0024】The retaining ring 21 has an end face 21c facing the tire side TS. The end face 21c extends along a virtual plane perpendicular to the axis x, for example. In this example, the end face 21c extends along the same virtual plane as the end face 26a of the flange portion 26. However, the end face 21c may be defined further towards the tire side TS than the end face 26a, or further towards the vehicle body side BS than the end face 26a. An annular recess 28 extending in the circumferential direction is formed between the end face 21c and the circumferential surface 21b. The recess 28 is recessed from the end face 21c toward the vehicle body side BS. In this example, the recess 28 defines a frustoconical surface with axis x as its central axis, which decreases in diameter toward the inner circumferential side IS as it moves from the end face 21c toward the vehicle body side BS. Note that the recess 28 may define a surface of other shapes, similar to the recess 27. 【0025】 The coupling structure 5 has an annular intermediate member 6 positioned between the inner ring 20 and the retaining ring 21, with an axis x. This intermediate member 6 has a main body 60 positioned across the first circumferential groove 50 and the second circumferential groove 51 of the inner ring 20. The main body 60 extends cylindrically along the axis x. The main body 60 is formed from a metallic material such as mild steel, copper, or aluminum. The main body 60 has an annular first crimping portion 61 that is crimped toward the second circumferential groove 51. The first crimping portion 61 is crimped toward the inner circumferential side IS in the radial direction. The first crimping portion 61 has an annular recess on its outer circumferential side OS. The first crimping portion 61 engages with a step formed between the first circumferential groove 50 and the second circumferential groove 51. In this way, the main body 60 is coupled to at least the second circumferential groove 51 by the first crimping portion 61. 【0026】 The main body 60 further has a second crimping portion 62 crimped toward the recess 28 and a third crimping portion 63 crimped toward the recess 27. The second crimping portion 62 covers the recess 28 in the axial and radial directions. In this way, the main body 60 is coupled to the recess 28. Similarly, the third crimping portion 63 covers the recess 27 in the axial and radial directions. In this way, the main body 60 is coupled to the recess 27. As a result, the intermediate member 6 is coupled to the inner ring body 22 by the first crimping portion 61 and the third crimping portion 63. Similarly, the retaining ring 21 is coupled to the stepped portion 25, i.e., the inner ring body 22, by the second crimping portion 62. 【0027】 In the coupling structure 5 described above, in the axial direction, the retaining ring 21 faces or abuts against the end face 25a of the stepped portion 25 at its end face 21a. The annular body 60 of the intermediate member 6 is press-fitted into the first circumferential groove 50. The body 60 is crimped into the second circumferential groove 51 at the first crimping portion 61 and into the recess 27 at the third crimping portion 63. In this way, the intermediate member 6 is coupled to the inner ring body 22. Furthermore, the body 60 is crimped into the recess 28 of the retaining ring 21 at the second crimping portion 62. As a result, the retaining ring 21 is coupled to the inner ring body 22 in the axial direction. In this way, the retaining ring 21 is firmly coupled to the inner ring 20 by the intermediate member 6. 【0028】 In the hub bearing 1 described above, the retaining ring 21 is firmly bonded to the inner ring 20 by the intermediate member 6 having multiple first crimping portions 61, second crimping portions 62, and third crimping portions 63. There is no need to deform the inner ring 20 or the retaining ring 21 themselves, which are the objects of the bond. Therefore, it is possible to increase the hardness of the inner ring 20 and the retaining ring 21 by, for example, hardening (heat treatment). In addition, since the retaining ring 21 can be firmly bonded to the inner ring 20 by crimping the intermediate member 6, the accuracy of preload application to the rolling elements 4 and the rotational accuracy of the hub bearing 1 can be improved. Note that in the hub bearing 1, the formation of the third crimping portion 63 and the recess 27 may be omitted. 【0029】Next, a coupling method according to one embodiment of the present invention will be described. Figures 3 to 6 are partially enlarged end views illustrating a coupling method for coupling a retaining ring 21 to an inner ring 20. First, as shown in Figure 3, an intermediate part 6A of the annular intermediate member 6, which is the original shape before deformation, is inserted into the first circumferential groove 50 along the first circumferential groove 50 and the second circumferential groove 51 of the inner ring 20. The body 60A of the intermediate part 6A is cylindrical and does not have a crimping portion. In this example, the annular body 60A is press-fitted into the first circumferential groove 50. Also, one end of the body 60A in the axial direction abuts against the side wall of the second circumferential groove 51. In this example, the other end of the body 60A in the axial direction is positioned at the same location as the end face 26a of the flange portion 26 of the inner ring 20 in the axial x1 direction of the inner ring 20. The inner ring 20 has been pre-hardened. 【0030】 Subsequently, as shown in Figure 4, one end of the main body 60A is crimped in the circumferential direction. For example, spin crimping is performed. Spin crimping is also called roll crimping, roller crimping, or rolling crimping. Specifically, for example, the annular pressing surface 71 of a disc-shaped jig, a roller 7, is pressed against the main body 60A in the circumferential direction while rotating around an axis parallel to the axis x1. In this state, the roller 7 rotates 360 degrees around the axis x while crimping the main body 60A. In this way, one end of the main body 60A is plastically deformed toward the second circumferential groove 51. Thus, a first crimped portion 61 is formed on one end of the main body 60A, crimped within the second circumferential groove 51. The first crimped portion 61 is locked into the step between the first circumferential groove 50 and the second circumferential groove 51. 【0031】Next, as shown in Figure 5, the retaining ring 21 is inserted into the stepped portion 25 of the inner ring body 22 in the direction of the axis x1. Although not shown, before insertion, multiple rolling elements 4a, 4b and the outer ring 33 are pre-placed on the inner ring body 22. The end face 21a of the retaining ring 21 faces or abuts against the end face 25a of the stepped portion 25. The preload applied to the rolling elements 4 is set by the position of the retaining ring 21 in the direction of the axis x1. In this example, the retaining ring 21 is press-fitted into the stepped portion 25. Specifically, the retaining ring 21 is press-fitted into the stepped portion 25 outside the first circumferential groove 50 and the second circumferential groove 51. The retaining ring 21 may also be press-fitted into the main body 60A. The retaining ring 21 has also been pre-hardened. 【0032】 Subsequently, as shown in Figure 6, the other end of the main body 60A is crimped in the axial direction. For example, spin crimping is performed. Specifically, for example, the annular pressing surface 81 of the roller 8, which is a disc-shaped jig, is pressed against the main body 60A in the axial direction while rotating around an axis perpendicular to the axis x1. In this state, the roller 8 rotates 360 degrees around the axis x1 while crimping the main body 60A. In a cross-section including the axis x1, the pressing surface 81 of the roller 8 is formed in a convex triangular shape on one side in the direction of the axis x1. The angle formed by the two sides connected at the vertex of the tip of the pressing surface 81 is set to, for example, 120°. Note that this angle may be appropriately adjusted according to, for example, the angle made by the surface of the recess 27 with respect to the end face 26a and the angle made by the surface of the recess 28 with respect to the end face 21c. 【0033】 In this way, the other end of the main body 60A in the direction of axis x1 contacts the recess 27 of the inner ring body 22 and the recess 28 of the retaining ring 21. Specifically, the end of the main body 60A is plastically deformed to cover the recesses 27 and 28. As a result, a second crimped portion 62 crimped toward the recess 28 and a third crimped portion 63 crimped toward the recess 27 are formed at the other end of the main body 60A. In this way, the retaining ring 21 is joined to the inner ring body 22 by crimping of the intermediate member 6. Note that the intermediate part 6A or the intermediate member 6 may be welded to the retaining ring 21 and / or the inner ring body 22 before or after the formation of the second crimped portion 62 and the third crimped portion 63. 【0034】 Furthermore, in the hub bearing 1, at least one of the first crimping portion 61, the second crimping portion 62, and the third crimping portion 63 may be joined to the second circumferential groove 51, the recess 28, and the recess 27 by welding instead of crimping. In this case, the first crimping portion 61, the second crimping portion 62, and the third crimping portion 63 are configured as the first joint, the second joint, and the third joint, respectively. As an example, the second joint and the third joint may be joined to the recess 28 and the recess 27 by welding, respectively. Furthermore, the first joint may be joined to the second circumferential groove 51 by welding. In forming the first joint, for example, the intermediate product 6A is melted toward the second circumferential groove 51 by welding and joined to the second circumferential groove 51. Similarly, in forming the second joint and the third joint, the intermediate product 6A is melted toward the recess 28 and the recess 27 by welding and joined to the recess 28 and the recess 27. 【0035】 In the hub bearing 1 described above, the coupling structure 5 was a structure that coupled the inner ring 20 and the retaining ring 21, but instead of this, or in addition to this, it may be a structure that coupled the outer ring 33 (second member) and the outer cylinder portion 32 (first member). In this case, the outer cylinder portion 32 functions as a retaining member that holds the outer ring 33. Specifically, a first circumferential groove and a second circumferential groove are formed on the inner circumferential surface of the outer cylinder portion 32 in order from the end of the vehicle body side BS of the outer cylinder portion 32. Also, recesses should be formed at the end of the vehicle body side BS of the outer ring 33 and the end of the vehicle body side BS of the outer cylinder portion 32, respectively. Furthermore, although the intermediate member 6 described above was formed in an annular shape that is continuous around the axis x, the intermediate member 6 may be formed from, for example, one or more arc-shaped parts that extend in the circumferential direction. In other words, the intermediate member 6 does not have to be annular. 【0036】Furthermore, in the above embodiment, the shape of the main body 60 (main body 60A) of the intermediate member 6 (intermediate product 6A) was annular, i.e., cylindrical, around axis x, but is not limited to this shape. For example, the main body 60 (main body 60A) of the intermediate member 6 (intermediate product 6A) may be formed in a shape in which a part of it is missing in the circumferential direction around axes x, x1, that is, in a C-shape when viewed in the axial direction along axes x, x1. Even in this case, the main body 60 (main body 60A) can be press-fitted into the first circumferential groove 50 by setting the inner diameter of the main body 60 (main body 60A) to be larger than the outer diameter of the first circumferential groove 50. However, the main body 60 (main body 60A) of the intermediate member 6 (intermediate product 6A) does not necessarily have to be press-fitted into the first circumferential groove 50. 【0037】 Although the present invention has been described above through the embodiments described above, the technical scope of the present invention is not limited to the scope described in the embodiments above. It will be obvious to those skilled in the art that various modifications or improvements can be made to the embodiments described above. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention. 【0038】 The embodiments described above are for the purpose of facilitating understanding of the present invention and are not intended to limit its interpretation. Furthermore, the embodiments described above do not limit the scope of application of the present invention, and the present invention may encompass anything as its target application. The components of the above embodiments, as well as their arrangement, materials, conditions, shapes, and sizes, are not limited to those exemplified and can be modified as appropriate. For example, the present invention includes differences that arise in the implementation of manufacturing tolerances, etc. Furthermore, components shown in different embodiments can be partially substituted or combined to the extent that they do not contradict each other in a technical sense. In addition, each configuration can be selectively combined as appropriate to achieve at least some of the problems and effects described above. 【0039】1 Hub bearing, 2 Inner member, 20 Inner ring (first member), 21 Retaining ring (second member), 21a End face, 21b Circumferential surface, 21c End face, 22 Inner ring body, 23 Disc portion, 24, 24a, 24b Inner rolling surface, 25 Step portion, 25a End face, 25b Circumferential surface (first circumferential surface), 26 Flange portion, 26a End face, 27 Recess, 28 Recess, 3 Outer member, 30 Inner cylinder portion, 31 Disc portion, 32 Outer cylinder portion (first member, retaining member), 33 Outer ring (second member), 33a End face, 34 Step portion, 34a End face, 35, 35a, 35b Outer rolling surface, 4, 4a, 4b Rolling element, 5 Coupling structure, 50 First circumferential groove, 51 Second circumferential groove, 6 Intermediate member, 6A Intermediate part, 60, 60A Main body, 61 First crimping part, 62 Second crimping part, 63 Third crimping part, 7 Roller, 71 Pressing surface, 8 Roller, 81 Pressing surface, TS Tire side, BS Body side, IS Inner circumference side, OS Outer circumference side, x, x1 Axis
Claims
1. A coupling structure comprising: a first member which is annular around an axis and has a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting the end face on one side in the axial direction, and a second circumferential groove which is adjacent to the first circumferential groove on the other side in the axial direction and extends in the circumferential direction on the first circumferential surface, and is deeper in the radial direction than the first circumferential groove; a second member which is annular around an axis and has a second circumferential surface facing the first circumferential surface; and an intermediate member which is disposed within the first circumferential groove and the second circumferential groove and has a first crimped portion crimped toward the second circumferential groove and a second crimped portion crimped toward a recess extending in the circumferential direction between the end face on one side in the axial direction of the second member and the second circumferential surface.
2. The coupling structure according to claim 1, wherein the first member has a recess extending in the circumferential direction between the end face and the first circumferential groove, and the intermediate member has a third crimped portion crimped toward the recess of the first member.
3. The coupling structure according to claim 1, wherein the intermediate member is annular around the axis.
4. The bonding method according to claim 1, wherein the first member and / or the second member have an HRC of 30 or more.
5. The coupling structure according to any one of claims 1 to 4, wherein the first member is the inner ring of a hub bearing having an outer ring, an inner ring, a plurality of rolling elements that support the outer ring and the inner ring so as to be rotatable relative to each other, and a retaining ring that supports the plurality of rolling elements between itself and the inner ring in the axial direction, and the second member is the retaining ring.
6. The coupling structure according to any one of claims 1 to 4, wherein the first member is a retaining member of a hub bearing having an outer ring, an inner ring, a plurality of rolling elements that support the outer ring and the inner ring so as to be rotatable relative to each other, and a retaining member that holds the outer ring in the axial direction, and the second member is the outer ring.
7. A joining method for joining an annular first member to an annular second member to an annular first member, the joining method comprising: the first member having a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting the end face on one side in the axial direction; and a second circumferential groove extending in the circumferential direction on the first circumferential surface adjacent to the first circumferential groove on the other side in the axial direction, and being deeper in the radial direction than the first circumferential groove; the second member having a second circumferential surface facing the first circumferential surface when joined to the first member; the joining method comprising the steps of: placing an intermediate product in the first circumferential groove and the second circumferential groove and crimping the intermediate product toward the second circumferential groove; and inserting the second member in the axial direction along the first circumferential surface of the first member and crimping the intermediate product toward a recess extending in the circumferential direction between the end face on one side in the axial direction of the second member and the second circumferential surface.
8. The joining method according to claim 7, wherein the first member has a recess extending in the circumferential direction between the end face and the first circumferential groove, and the intermediate product is further crimped toward the recess of the first member.
9. The joining method according to claim 7, comprising the step of welding the intermediate product to the first member and / or the second member before or after crimping the intermediate product toward the recess.
10. The coupling method according to claim 7, wherein the intermediate product is annular around the axis.
11. The bonding method according to claim 10, wherein the first member and / or the second member have an HRC of 30 or more.
12. The joining method according to claim 10, wherein the intermediate product is press-fitted into the first circumferential groove.
13. The joining method according to claim 7, wherein the second member is press-fitted to the first member outside the first and second circumferential grooves.
14. The coupling method according to any one of claims 10 to 13, wherein the first member is the inner ring of a hub bearing having an outer ring, an inner ring, a plurality of rolling elements that support the outer ring and the inner ring so as to be rotatable relative to each other, and a retaining ring that supports the plurality of rolling elements between itself and the inner ring in the axial direction, and the second member is the retaining ring.
15. The coupling method according to any one of claims 10 to 13, wherein the first member is a retaining ring of a hub bearing having an outer ring, an inner ring, a plurality of rolling elements that support the outer ring and the inner ring so as to be rotatable relative to each other, and a retaining ring that holds the outer ring in the axial direction, and the second member is the outer ring.
16. A coupling structure comprising: a first member which is annular around an axis and has a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting the end face on one side in the axial direction, and a second circumferential groove which is adjacent to the first circumferential groove on the other side in the axial direction and extends in the circumferential direction on the first circumferential surface, and is deeper in the radial direction than the first circumferential groove; a second member which is annular around an axis and has a second circumferential surface facing the first circumferential surface; and an intermediate member which is disposed within the first circumferential groove and the second circumferential groove and has a first joint portion which is joined within the second circumferential groove, and a second joint portion which is joined in a recess extending in the circumferential direction between the end face on one side in the axial direction of the second member and the second circumferential surface.
17. The coupling structure according to claim 16, wherein the first member has a recess extending in the circumferential direction between the end face and the first circumferential groove, and the intermediate member has a third joining portion that is joined to the recess of the first member.
18. The joining structure according to claim 16 or 17, wherein the joining is achieved by welding.
19. A joining method for joining a second member, which is annular in shape around an axis, to a first member, which is annular in shape around an axis, wherein the first member has a first circumferential groove extending in the circumferential direction on a first circumferential surface intersecting the end face on one side in the axial direction, and a second circumferential groove extending in the circumferential direction on the first circumferential surface adjacent to the first circumferential groove on the other side in the axial direction, and being deeper in the radial direction than the first circumferential groove, and the second member has a second circumferential surface that faces the first circumferential surface when joined to the first member, the joining method comprising the steps of: placing an intermediate product in the first circumferential groove and the second circumferential groove and joining the intermediate product in the second circumferential groove; and inserting the second member in the axial direction along the first circumferential surface of the first member and joining the intermediate product in a recess extending in the circumferential direction between the end face on one side in the axial direction of the second member and the second circumferential surface.
20. The joining method according to claim 19, wherein the first member has a recess extending in the circumferential direction between the end face and the first circumferential groove, and the intermediate product is further joined to the recess of the first member.
21. The joining method according to claim 19 or 20, wherein the joining is achieved by welding.