Rolling bearing

Abstract

This invention relates to a rolling bearing having an outer ring, an inner ring, and a plurality of rolling elements. The outer ring includes: a first outer ring track member having a track surface on its inner circumference; a first outer ring body having a contact surface abutting against the outer circumferential surface of the first outer ring track member; a second outer ring track member arranged and fixed to the first outer ring track member in a first axial direction extending from the central axis, having a track surface on its inner circumference; and a second outer ring body having a contact surface abutting against the outer circumferential surface of the second outer ring track member. The inner ring includes: a first inner ring track member having a track surface on its outer circumference; a first inner ring body having a contact surface abutting against the inner circumferential surface of the first inner ring track member; a second inner ring track member arranged and fixed to the first inner ring track member in a first axial direction extending from the central axis, having a track surface on its outer circumference; and a second inner ring body having a contact surface abutting against the inner circumferential surface of the second inner ring track member. Compared to the first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body, the first outer ring track component, the second outer ring track component, the first inner ring track component, and the second inner ring track component are made of materials with low specific gravity and high rigidity.

Description

Technical Field

[0001] This invention relates to rolling bearings. Background Technology

[0002] A rolling bearing is known in which the outer ring and inner ring are each composed of a pair of plate members (e.g., Patent Document 1). In the rolling bearing in which the outer ring and inner ring are each composed of a pair of plate members, it is known that the plate members constituting the outer ring are fitted and fixed to each other, and the plate members constituting the inner ring are fitted and fixed to each other, and an adhesive layer is further provided at the fitting part (e.g., Patent Document 2).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-178735

[0006] Patent Document 2: WO2022 / 065248 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] There is a need for lightweight yet rigid rolling bearings. Therefore, one of the objectives of this disclosure is to provide a rolling bearing that combines lightweight and rigidity.

[0009] Technical means for solving problems

[0010] The rolling bearing disclosed herein comprises: an outer ring; an inner ring having a central axis common to the outer ring and disposed on the inner circumferential side of the outer ring; and a plurality of rolling elements configured to roll on the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. The outer ring includes: a first outer ring track member having a track surface on its inner circumference; a first outer ring body having an abutting surface abutting against the outer circumferential surface of the first outer ring track member; a second outer ring track member arranged and fixed to the first outer ring track member in a first axial direction extending from the central axis, having a track surface on its inner circumference; and a second outer ring body having an abutting surface abutting against the outer circumferential surface of the second outer ring track member. The inner ring includes: a first inner ring track member having a track surface on its outer periphery; a first inner ring body having an abutment surface that abuts against the inner periphery of the first inner ring track member; a second inner ring track member arranged and fixed to the first inner ring track member in a first axial direction extending from the central axis, having a track surface on its outer periphery; and a second inner ring body having an abutment surface that abuts against the inner periphery of the second inner ring track member. The first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body are made of a material with low specific gravity and high rigidity compared to the first outer ring track member, the second outer ring track member, the first inner ring track member, and the second inner ring track member.

[0011] The effects of the invention

[0012] Based on the above-described rolling bearing, it is possible to provide a lightweight and rigid rolling bearing. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the structure of the rolling bearing disclosed herein.

[0014] Figure 2 This is a side view showing the structure of the rolling bearing of this disclosure.

[0015] Figure 3 This is a perspective sectional view showing the structure of the rolling bearing disclosed herein.

[0016] Figure 4 This is a perspective sectional view showing a portion of the outer ring and rolling elements of the rolling bearing of this disclosure.

[0017] Figure 5 This is a perspective view showing a portion of the outer ring body of the rolling bearing disclosed herein cut open.

[0018] Figure 6 This is a perspective view showing the outer raceway component of the rolling bearing of this disclosure.

[0019] Figure 7 This is a perspective sectional view showing a portion of the inner ring and rolling elements of the rolling bearing of this disclosure.

[0020] Figure 8 This is a perspective view showing a portion of the inner ring body of the rolling bearing disclosed herein cut open.

[0021] Figure 9 This is a perspective view showing the inner raceway component of the rolling bearing of this disclosure.

[0022] Figure 10 This is a top view showing the structure of the rolling bearing of this disclosure. Detailed Implementation

[0023] [Summary of Implementation Methods]

[0024] First, embodiments of the present disclosure will be described. The rolling bearing of the present disclosure includes: an outer ring; an inner ring having a central axis common to the outer ring and disposed on the inner circumferential side of the outer ring; and a plurality of rolling elements configured to roll on the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. The outer ring includes: a first outer ring track member having a track surface on its inner circumference; a first outer ring body having an abutting surface abutting against the outer circumferential surface of the first outer ring track member; a second outer ring track member arranged and fixed to the first outer ring track member in a first axial direction extending from the central axis, having a track surface on its inner circumference; and a second outer ring body having an abutting surface abutting against the outer circumferential surface of the second outer ring track member. The inner ring includes: a first inner ring track member having a track surface on its outer periphery; a first inner ring body having an abutment surface that abuts against the inner periphery of the first inner ring track member; a second inner ring track member arranged and fixed to the first inner ring track member in a first axial direction extending from the central axis, having a track surface on its outer periphery; and a second inner ring body having an abutment surface that abuts against the inner periphery of the second inner ring track member. The first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body are made of a material with low specific gravity and high rigidity compared to the first outer ring track member, the second outer ring track member, the first inner ring track member, and the second inner ring track member.

[0025] Previously, lightweight rolling bearings, such as those disclosed in Patent Documents 1 and 2, were known. In the rolling bearings disclosed in these patent documents, the outer ring and inner ring of the rolling bearing are each composed of a pair of components (called outer ring dividing ring and inner ring dividing ring) that are divided in the axial direction. After the outer ring dividing ring and inner ring dividing ring are formed into a predetermined shape by stamping or the like, they are fixed together by fitting a protrusion formed on one of the dividing rings with a concave portion formed on the other.

[0026] According to Patent Document 1, lightweight rolling bearings can be achieved. On the other hand, it is required that rolling bearings maintain their lightweight nature while possessing rigidity appropriate for their application. Under these circumstances, lightweight rolling bearings with rigidity have been investigated.

[0027] In the rolling bearing disclosed herein, the outer ring and inner ring are each composed of components that are divided axially. Furthermore, the component with the track surface (track component) and the main body component disposed outside the track surface are composed of other components made of different materials. The track components are fixed to each other, forming the track for the outer ring and the track for the inner ring, respectively. Compared to the component with the track surface, the main body component is made of a material with low specific gravity and high rigidity. With this structure, by using a lightweight and highly rigid material as the main body component, a lightweight and rigid bearing assembly is formed, and the material for the track surface can be selected to ensure the function of the bearing. This structure provides a lightweight and rigid bearing.

[0028] In the aforementioned rolling bearing, the first outer ring track member may have a plurality of first outer ring fixing portions arranged circumferentially spaced apart, and the second outer ring track member may have a plurality of second outer ring fixing portions arranged circumferentially spaced apart. The first outer ring track member and the second outer ring fixing portions can be engaged with each other to fix them together. Similarly, the first inner ring track member may have a plurality of first inner ring fixing portions arranged circumferentially spaced apart, and the second inner ring track member may have a plurality of second inner ring fixing portions arranged circumferentially spaced apart. The first inner ring track member and the second inner ring fixing portions can be engaged with each other to fix them together. With this structure, the outer ring track members and the inner ring track members are reliably fixed to each other, and in addition to being fixed radially, circumferential misalignment is particularly suppressed. Therefore, the effects of this disclosure can be obtained more reliably.

[0029] In the aforementioned rolling bearing, the first outer ring body and the second outer ring body can be arranged spaced apart from each other along the first axial direction, separated by the first outer ring track member and the second outer ring track member. The first inner ring body and the second inner ring body can also be arranged spaced apart from each other along the first axial direction, separated by the first inner ring track member and the second inner ring track member. With this structure, the first outer ring body and the second outer ring body (the first inner ring body and the second inner ring body) can be formed into components of the same shape. Furthermore, the first outer ring body and the second outer ring body (the first inner ring body and the second inner ring body) can also be formed into components of different shapes, offering a high degree of design freedom depending on the application and location.

[0030] In the aforementioned rolling bearing, the first outer ring track member and the second outer ring track member may each have, on their respective outer peripheries, an outer peripheral plane extending perpendicularly to the first axial direction and an outer peripheral wall extending along the first axial direction; the first outer ring body and the first outer ring track member, and the second outer ring body and the second outer ring track member, may abut against each other on the outer peripheral plane and the outer peripheral wall, respectively. The first inner ring track member and the second inner ring track member may each have, on their respective inner peripheries, an inner peripheral plane extending perpendicularly to the first axial direction and an inner peripheral wall extending along the first axial direction; the first inner ring body and the first inner ring track member, and the second inner ring body and the second inner ring track member, may abut against each other on the inner peripheral plane and the inner peripheral wall, respectively. With this structure, even when the outer and inner ring track members are made of relatively thin materials such as sheet metal or plate, a rigid rolling bearing can be obtained.

[0031] In the aforementioned rolling bearing, the first outer ring track member, the second outer ring track member, the first inner ring track member, and the second inner ring track member can be made of steel, while the first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body can be made of ceramic. According to this structure, by applying known manufacturing methods to the components with track surfaces (the first outer ring track member, the second outer ring track member, the first inner ring track member, and the second inner ring track member), the required precision and durability as a bearing can be ensured. Simultaneously, by using ceramic as the body material, which balances lightweight and rigidity, a bearing that reliably balances lightweight and rigidity can be obtained.

[0032] In the aforementioned rolling bearing, when viewed along the first axial plane, the outer contour of the outer ring may include a portion that is radially recessed inwards than a virtual outer contour circle centered on the central axis and passing through the portion of the outer contour of the outer ring furthest from the central axis. The inner contour of the inner ring may include a portion that is radially recessed outwards than a virtual inner contour circle centered on the central axis and passing through the portion of the inner contour of the inner ring closest to the central axis. According to this structure, further weight reduction can be achieved by removing a portion of the outer circumferential side and a portion of the inner circumferential side of the bearing as a so-called hollowed-out portion.

[0033] [Specific examples of implementation methods]

[0034] Next, an example of a specific embodiment of the rolling bearing of this disclosure will be described with reference to the accompanying drawings. In the following drawings, the same or equivalent parts will be labeled with the same reference numerals and their descriptions will not be repeated. In the following description, the direction along the axis of the rolling bearing will be referred to as the thickness direction of the rolling bearing. Furthermore, the direction perpendicular to the axis of the rolling bearing will be referred to as the surface direction of the rolling bearing.

[0035] Figure 1 This is a perspective view showing the structure of a rolling bearing, as an example of an embodiment of the present disclosure. (Refer to...) Figure 1 The rolling bearing 1 has an outer ring 10, an inner ring 50, and rollers 40 as rolling elements. The outer ring 10 and the inner ring 50 share a common central axis R. The inner ring 50 is disposed on the inner circumferential side of the outer ring 10. The rolling bearing 1 has a plane-symmetrical shape centered on a plane (called the center plane) that passes through the center of the thickness direction and is perpendicular to the central axis R. That is, the rolling bearing 1 has no distinction between an inner and outer surface.

[0036] Figure 2 This is a side view of the rolling bearing 1 as seen from a direction perpendicular to the central axis R. (Refer to...) Figure 2 The outer ring 10 includes: a first outer ring body 20A and a second outer ring body 20B as a pair of components; and a first outer ring track component 30A and a second outer ring track component 30B as a pair of components. The first outer ring body 20A and the second outer ring body 20B are components of the same shape. The first outer ring track component 30A and the second outer ring track component 30B are components of the same shape. The second outer ring track component 30B is arranged with the first outer ring track component 30A in the direction of extension of the central axis R. The first outer ring body 20A and the second outer ring body 20B are separated from each other by the outer ring track components 30A and 30B. The first outer ring body 20A, the first outer ring track component 30A, the second outer ring track component 30B, and the second outer ring body 20B are in this order and are closely attached to each other in the thickness direction.

[0037] Reference Figure 1 andFigure 2 In the rolling bearing 1, both end faces along the central axis R, namely the first main surface 1a and the second main surface 1b, are flat. By making the first main surface 1a and the second main surface 1b flat, the contact area with the mounted component can be maximized, thereby ensuring the stability of the bearing's operation.

[0038] Figure 3 This is a perspective sectional view of a portion of the rolling bearing 1, showing a cross-section. (Refer to...) Figure 3 The inner ring 50 includes: a first inner ring body 60A and a second inner ring body 60B as a pair of components; and a first inner ring track component 70A and a second inner ring track component 70B as a pair of components. The first inner ring body 60A and the second inner ring body 60B are components of the same shape. The first inner ring track component 70A and the second inner ring track component 70B are components of the same shape. The second inner ring track component 70B extends in the direction of the central axis R (refer to...). Figure 1 The first inner ring body 60A and the second inner ring body 60B are arranged together. The first inner ring body 60A and the second inner ring body 60B are separated from each other by the inner ring track members 70A and 70B. The first inner ring body 60A, the first inner ring track member 70A, the second inner ring track member 70B and the second inner ring body 60B are closely attached to each other in the thickness direction in this order.

[0039] The components constituting the track surface of the rolling bearing 1, namely the first outer ring track component 30A, the second outer ring track component 30B, the first inner ring track component 70A, and the second inner ring track component 70B, are, for example, made of steel. The outer ring track components 30A and 30B, and the inner ring track components 70A and 70B, are made of steel plates machined into a specified shape. The steel used as the material can be, for example, SCM415 as specified in the JIS standard. The thickness of the steel plate can be, for example, approximately 0.4 mm to 3.2 mm.

[0040] Compared to the outer ring track components 30A and 30B and the inner ring track components 70A and 70B, the components constituting the main body of the rolling bearing 1, namely the first outer ring body 20A, the second outer ring body 20B, the first inner ring body 60A, and the second inner ring body 60B, are each made of a material with low specific gravity and high rigidity. The materials for the outer ring bodies 20A and 20B, and the inner ring bodies 60A and 60B, can be, for example, ceramics, aluminum, engineering plastic resins, magnesium, or metal-ceramic composites (e.g., aluminum / SiC composite materials containing SiC ceramic particles in aluminum alloys). Preferably, the outer ring bodies 20A and 20B, and the inner ring bodies 60A and 60B, can be ceramics, for example. The ceramic material can be, for example, silicon carbide (SiC), silicon nitride (Si3N4), alumina (Al2O3), or a material containing two or more of these.

[0041] ReferenceFigure 1 , Figure 3 The outer ring track components 30A and 30B respectively include first portions 35A and 35B, second portions 36A and 36B, and third portions 37A and 37B. The first portions 35A and 35B, the second portions 36A and 36B, and the third portions 37A and 37B can have substantially the same thickness. The first portions 35A and 35B are portions with a circular annular shape. The first portions 35A and 35B share a central axis with the central axis R of the rolling bearing 1. The second portions 36A and 36B have a cylindrical shape. The outer shape of the second portions 36A and 36B is frustoconical. The second portions 36A and 36B extend from the inner edge of the first portions 35A and 35B in a manner where their inner diameter decreases in the thickness direction as they move away from the first portions 35A and 35B. The second portions 36A and 36B have annular inner circumferential surfaces 39a and 39b. The inner circumferential surfaces 39a and 39b share a central axis with the central axis R of the rolling bearing 1. Rollers 40 roll on inner circumferential surfaces 39a and 39b. That is, inner circumferential surfaces 39a and 39b are track surfaces. Third portions 37A and 37B have a cylindrical shape. Third portions 37A and 37B share a central axis with the central axis R of the rolling bearing 1. Third portions 37A and 37B are portions that connect to the end of the second portions 36A and 36B in the thickness direction (central axis direction) opposite to the first portions 35A and 35B and extend along the central axis direction.

[0042] Reference Figure 1 , Figure 3 The inner track components 70A and 70B respectively include first portions 75A and 75B, second portions 76A and 76B, and third portions 77A and 77B. The first portions 75A and 75B, the second portions 76A and 76B, and the third portions 77A and 77B can have substantially the same thickness. Furthermore, the first portions 75A and 75B preferably have substantially the same thickness as the first portions 35A and 35B of the outer track components 30A and 30B. The first portions 75A and 75B have a circular annular shape. The first portions 75A and 75B share a central axis with the central axis R of the rolling bearing 1. The second portions 76A and 76B have a cylindrical shape. The outer shape of the second portions 76A and 76B is frustoconical. The second portions 76A and 76B extend from the outer edge of the first portions 75A and 75B in a manner where their outer diameter increases in the thickness direction as they move away from the first portions 75A and 75B. Parts 76A and 76B have annular outer peripheral surfaces 79a and 79b ( Figure 7The outer peripheral surfaces 79a and 79b share a central axis with the central axis R of the rolling bearing 1. Rollers 40 roll on the outer peripheral surfaces 79a and 79b. That is, the outer peripheral surfaces 79a and 79b are track surfaces. The third portions 77A and 77B have a cylindrical shape. The third portions 77A and 77B share a central axis with the central axis R of the rolling bearing 1. The third portions 77A and 77B are portions that are connected to the ends of the second portions 76A and 76B in the thickness direction (central axis direction) opposite to the first portions 75A and 75B and extend along the central axis direction. The third portions 37A and 37B of the outer ring track members 30A and 30B are spaced apart from each other and opposite to the third portions 77A and 77B of the inner ring track members 70A and 70B.

[0043] Figure 4 This is a perspective sectional view showing a portion of the outer ring 10 and rollers 40 of the rolling bearing 1. (See reference...) Figure 4 The roller 40 includes a plurality of first rollers 41 and a plurality of second rollers 42. The first rollers 41 and second rollers 42 are made of, for example, steel. More specifically, for example, they may be SUJ2 as specified in the JIS standard. The first rollers 41 and second rollers 42 have a cylindrical shape. The first rollers 41 and second rollers 42 each have a cylindrical outer peripheral surface and circular end faces located at both ends of the outer peripheral surface. The first rollers 41 and second rollers 42 are arranged alternately in the circumferential direction. The first rollers 41 roll on the inner peripheral surface 39a of the first outer ring track member 30A. The second rollers 42 roll on the inner peripheral surface 39b of the second outer ring track member 30B. The inner peripheral surfaces 39a and 39b are the wall surfaces defining the outer peripheral side of the track 11 of the rolling bearing 1.

[0044] The first outer ring body 20A has a contact surface that abuts against the outer peripheral surface of the first outer ring track member 30A. The second outer ring body 20B has a contact surface that abuts against the outer peripheral surface of the second outer ring track member 30B. The configuration of the outer ring track members and the outer ring bodies will be described in more detail. The first parts 35A and 35B of the outer ring track members 30A and 30B have a contact surface with the central axis R (refer to...). Figure 2 The outer peripheral planes 351a and 351b extend perpendicularly in the direction of the outer ring. The outer ring bodies 20A and 20B each have surfaces 251a and 251b that abut against the outer peripheral planes 351a and 351b. The third parts 37A and 37B of the outer ring track components 30A and 30B have surfaces 37A and 37B along the central axis R (refer to...). Figure 2 The outer peripheral walls 371a and 371b extend in the direction of the outer ring. The outer ring bodies 20A and 20B each have surfaces 271a and 271b that abut against the outer peripheral walls 371a and 371b. That is, the outer ring bodies 20A and 20B abut against the outer ring track members 30A and 30B on the surfaces perpendicular to the central axis R and parallel to the outer ring track members 30A and 30B on their outer peripheral surfaces.

[0045] The second parts 36A and 36B of the outer track components 30A and 30B do not abut against the outer main bodies 20A and 20B. However, as a variation, the second parts 36A and 36B of the outer track components 30A and 30B may abut against the outer main bodies 20A and 20B.

[0046] The outer ring 10 has eight mounting portions 13 at equal intervals in the circumferential direction. By inserting screws or the like into the mounting portions 13 and tightening them, the four components constituting the outer ring 10, namely the outer ring main bodies 20A and 20B and the outer ring track components 30A and 30B, can be integrally tightened and fixed, thereby fixing the rolling bearing 1 to the mounting object as an external component.

[0047] Figure 5 This is a perspective view showing the removal of the first outer ring body 20A. It is shown with a portion of the first outer ring body 20A cut open. The first outer ring body 20A has an annular portion 25A and eight protrusions 21A extending radially outward from the annular portion 25A. The annular portion 25A has a connection with the first outer ring track member 30A (…). Figure 4 The contact surfaces 271a and 251a abut against each other. The protrusion 21A constitutes the mounting part 13. A hole 22A is formed on the protrusion 21A, extending along the central axis. The hole 22A functions as a mounting hole. The second outer ring body 20B has the same shape as the first outer ring body 20A, and its description is omitted. The first outer ring body 20A is, for example, ceramic.

[0048] Figure 6 This is a perspective view showing the removal of the first outer track component 30A. (Refer to...) Figure 4 , Figure 6 The first outer ring track member 30A has a first part 35A, a second part 36A, and a third part 37A. Eight protrusions 31A are provided radially outward from the first part 35A, which is a circular annular portion. The protrusions 31A constitute the mounting portion 13. A hole 32A is formed in the protrusion 31A, extending along the central axis. The shape of the protrusions 31A is similar to that of the protrusion 21A (…). Figure 5 The diameters of holes 32A and 22A are essentially the same. Furthermore, the diameter of hole 32A is the same as that of hole 22A. Figure 5 The same as the first outer ring track member 30A. Hole 32A functions as a mounting hole. The second outer ring track member 30B has the same shape as the first outer ring track member 30A, so description is omitted.

[0049] When the first outer ring track member 30A and the first outer ring body 20A are combined, and further when the first outer ring track member 30A, the second outer ring track member 30B, the first outer ring body 20A, and the second outer ring body 20B are combined, the protrusions of each member are located at the same position in the circumferential direction, allowing the members to be fastened and fixed together. Additionally, it can be installed on a target member. Furthermore, the number of protrusions provided on the outer ring body and the outer ring track member can be set appropriately according to the overall dimensions of the rolling bearing. For example, the number of protrusions can be 6 to 12.

[0050] Eight outer ring fixing portions 33A are provided radially outward from the first portion 35A of the first outer ring track member 30A and are separate from the protrusion 31A. The eight outer ring fixing portions 33A are provided at equal intervals in the circumferential direction. Furthermore, the outer ring fixing portions 33A and the protrusions 31A are arranged alternately. Either a protrusion 34A or a recess 38A is formed on the outer ring fixing portion 33A. The protrusions 34A and recesses 38A are arranged alternately in the circumferential direction. The protrusion 34A is a portion that protrudes in the direction opposite to the direction extending from the third portion 37A. The protrusion 34A is a cylindrical protrusion. The recess 38A is a hole with substantially the same diameter as the cylindrical protrusion of the protrusion 34A. The second outer ring track member 30B has the same structure. Through these structures, the recesses or protrusions of the second outer ring track member 30B are combined with the protrusions 34A or recesses 38A, so that the first outer ring track member 30A and the second outer ring track member 30B are mutually fitted and fixed. Furthermore, the number of outer ring fixing portions can be set appropriately according to the overall dimensions of the rolling bearing. For example, the number of protrusions can be 6 to 12.

[0051] Figure 7 This is a perspective sectional view showing a portion of the inner ring 50 and roller 40 of the rolling bearing 1. (Refer to...) Figure 7 The second roller 42 rolls on the outer circumferential surface 79b of the second inner ring track member 70B. The first roller (refer to...) Figure 4 It rolls on the outer peripheral surface 79a of the first inner ring track member 70A. The outer peripheral surfaces 79a and 79b are the walls of the inner peripheral side of the track 11 of the rolling bearing 1.

[0052] The first inner ring body 60A has an abutment surface that abuts against the inner circumferential surface of the first inner ring track member 70A. The second inner ring body 60B has an abutment surface that abuts against the inner circumferential surface of the second inner ring track member 70B. The configuration of the inner ring track members and the inner ring bodies will be described in more detail. The first portions 75A and 75B of the inner ring track members 70A and 70B have an abutment surface that abuts against the inner circumferential surface of the second inner ring track member 70B (refer to...). Figure 2The inner peripheral planes 751a and 751b extend perpendicularly in the direction of the inner ring. The inner ring bodies 60A and 60B each have surfaces 651a and 651b that abut against the inner peripheral planes 751a and 751b. The third parts 77A and 77B of the inner ring track members 70A and 70B have surfaces 77A and 77B along the central axis R (refer to...). Figure 2 The inner peripheral walls 771a and 771b extend in the direction of the inner ring. The inner ring bodies 60A and 60B each have surfaces 671a and 671b that abut against the inner peripheral walls 771a and 771b, respectively. That is, the inner ring bodies 60A and 60B abut against the inner ring track members 70A and 70B on the surfaces perpendicular to the central axis R and parallel to the inner peripheral surfaces of the inner ring track members 70A and 70B.

[0053] The second parts 76A and 76B of the inner track components 70A and 70B do not abut against the inner main bodies 60A and 60B. However, as a variation, the second parts 76A and 76B can also abut against the inner main bodies 60A and 60B.

[0054] The inner ring 50 has six mounting portions 16 at equal intervals in the circumferential direction. By inserting screws or the like into the mounting portions 16 and tightening them, the four components constituting the inner ring 50, namely the inner ring main bodies 60A and 60B and the inner ring track components 70A and 70B, can be integrally tightened and fixed, thereby fixing the rolling bearing 1 to the mounting object as an external component.

[0055] Figure 8 This is a perspective view showing the removal of the first inner ring body 60A. It is shown with a portion of the first inner ring body 60A cut open. The first inner ring body 60A has an annular portion 65A and six protrusions 61A extending radially inward from the annular portion 65A. The annular portion 65A has a connection with the first inner ring track member 70A (…). Figure 7 The contact surfaces 671a and 651a abut against each other. The protrusion 61A constitutes the mounting part 16. A hole 62A is formed in the protrusion 61A, which extends along the central axis. The hole 62A is a mounting hole. The second inner ring body 60B has the same shape as the first inner ring body 60A, and its description is omitted. The first inner ring body 60A is, for example, ceramic.

[0056] Figure 9 This is a perspective view showing the removal of the first inner track component 70A. (Refer to...) Figure 4 , Figure 9 The first inner ring track member 70A has a first part 75A, a second part 76A, and a third part 77A. Six protrusions 71A are provided radially inward from the first part 75A, which is an annular portion of a circular plate. The protrusions 71A constitute the mounting portion 16. A hole 72A is formed in each protrusion 71A, extending along the central axis. The shape of the protrusions 71A is similar to that of protrusion 61A (…). Figure 8The diameters of holes 72A and 62A are essentially the same. Additionally, the diameter of hole 72A is the same as that of hole 62A. Figure 8 The diameters of the two inner track components are the same. The second inner track component 70B has the same shape as the first inner track component 70A, and its description is omitted.

[0057] When the first inner ring track member 70A and the first inner ring body 60A are combined, and further when the first inner ring track member 70A, the second inner ring track member 70B, the first inner ring body 60A, and the second inner ring body 60B are combined, the protrusions of each member are located at the same position in the circumferential direction, enabling the members to be fastened and fixed together. Furthermore, the number of protrusions provided on the inner ring body and the inner ring track member can be set appropriately according to the overall dimensions of the rolling bearing. For example, the number of protrusions can be 4 to 8.

[0058] Six inner ring fixing portions 73A are provided radially inwardly from the first portion 75A of the first inner ring track member 70A and are separate from the protrusion 71A. The six inner ring fixing portions 73A are provided at equal intervals in the circumferential direction. Furthermore, the inner ring fixing portions 73A and the protrusion 71A are arranged alternately. Either a protrusion 74A or a recess 38A is formed in the inner ring fixing portion 73A. The protrusion 74A and the recess 78A are arranged alternately in the circumferential direction. The protrusion 74A is a portion that protrudes in the direction opposite to the direction extending from the third portion 77A, i.e., the direction of the central axis (i.e., the direction where the second inner ring track member 70B is located). The protrusion 74A is a cylindrical protrusion. The recess 78A is a hole with substantially the same diameter as the protrusion 74A. The second inner ring track member 70B has the same structure. By combining the recesses or protrusions of the second inner ring track member 70B with the protrusions 74A or recesses 78A, the first inner ring track member 70A and the second inner ring track member 70B are mutually fitted and fixed. Furthermore, the number of inner ring fixing parts can be set appropriately according to the overall dimensions of the rolling bearing. The number of protrusions can be, for example, 4 to 8.

[0059] Figure 10 This is a top view showing the structure of rolling bearing 1. Figure 10 This is an observation of the state of rolling bearing 1 along a plane oriented along the central axis R. (Refer to...) Figure 10 The outer contour of the outer ring 10 has a portion that is recessed radially inward from the virtual outer contour circle C1 surrounding the outermost circumference of the rolling bearing 1. This recessed portion is called a hollowed-out portion. The virtual outer contour circle C1 is a virtual circle with radius r1 passing through the portion of the outer contour of the outer ring 10 furthest from the central axis R. The radius r2 of the annular portion 25A of the outer ring 10 can be approximately 40-85% of radius r1. By hollowing out a portion of the outer circumference, further weight reduction can be achieved. The specific values ​​of radii r1 and r2 are not limited; for example, radius r1 can be 40-150 mm, and radius r2 can be 32-138 mm.

[0060] The inner contour of the inner ring 50 has a recessed portion extending radially outward from the virtual outer contour circle C2 surrounding the innermost circumference of the rolling bearing 1. This recessed portion is what is known as a hollowed-out portion. The virtual outer contour circle C2 is a virtual circle with radius r3 passing through the portion of the inner contour of the inner ring 50 closest to the central axis R. Radius r3 can be approximately 40-85% of the radius r4 of the annular portion 65A of the inner ring 50. Further weight reduction can be achieved by removing a portion of the inner circumference. The specific values ​​of radii r3 and r4 are not limited; for example, radius r3 can be 1.5-100 mm, and radius r4 can be 9.5-112 mm.

[0061] The axial thickness of the rolling bearing disclosed herein is not particularly limited, and can be, for example, 4 to 20 mm.

[0062] It should be understood that the embodiments disclosed herein are exemplary in all respects and are not intended to limit any aspect. The scope of the invention is defined by the claims, not by the foregoing description, and is intended to include all modifications of the same meaning and scope as the claims.

[0063] Explanation of reference numerals in the attached figures: 1: Rolling bearing; 10: Outer ring; 11: Track; 13, 16: Mounting part; 20A, 20B: Outer ring body; 30A, 30B: Outer ring track component; 21A, 31A: Protrusion; 22A, 32A: Hole; 25A: Annular part; 33A: Outer ring fixing part; 34A: Protrusion; 38A: Recess; 40, 41, 42: Roller; 50: Inner ring; 60A, 60B: Inner ring body; 70A, 70B: Inner ring track component; 61A, 71A: Protrusion; 62A, 72A: Hole; 65A: Annular part; 73A: Inner ring fixing part; 74A: Protrusion; 78A: Recess.

Claims

1. A rolling bearing, wherein, have: Outer ring; An inner ring, having a central axis common to the outer ring, is disposed on the inner circumferential side of the outer ring; and A plurality of rolling elements are configured to roll on the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring; The outer ring includes: The first outer ring track component has a track surface on its inner circumference; The first outer ring body has an abutting surface that abuts against the outer peripheral surface of the first outer ring track component; The second outer ring track member is arranged and fixed to the first outer ring track member in a first axial direction extending from the central axis, and has a track surface on its inner circumference; and The second outer ring body has an abutting surface that abuts against the outer peripheral surface of the second outer ring track component; The inner ring includes: The first inner track component has a track surface on its outer periphery; The first inner ring body has an abutting surface that abuts against the inner circumferential surface of the first inner ring track component; The second inner ring track member is arranged and fixed to the first inner ring track member in a first axial direction extending from the central axis, and has a track surface on its outer periphery; and The second inner ring body has an abutting surface that abuts against the inner circumferential surface of the second inner ring track component; Compared to the first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body, the first outer ring track component, the second outer ring track component, the first inner ring track component, and the second inner ring track component are made of materials with low specific gravity and high rigidity.

2. The rolling bearing according to claim 1, wherein, The first outer ring track component has a plurality of first outer ring fixing parts arranged circumferentially spaced from each other. The second outer ring track member has a plurality of second outer ring fixing parts arranged circumferentially spaced apart from each other. The first outer ring fixing part and the second outer ring fixing part are interlocked to fix the first outer ring track component and the second outer ring track component to each other. The first inner ring track member has a plurality of first inner ring fixing parts arranged circumferentially spaced apart from each other. The second inner ring track member has a plurality of second inner ring fixing parts arranged circumferentially spaced apart from each other. The first inner ring fixing part and the second inner ring fixing part are interlocked to fix the first inner ring track component and the second inner ring track component to each other.

3. The rolling bearing according to claim 1 or 2, wherein, The first outer ring body and the second outer ring body are arranged apart from each other in the first axial direction, with the first outer ring track member and the second outer ring track member as a means. The first inner ring body and the second inner ring body are arranged apart from each other in the first axial direction, with the first inner ring track member and the second inner ring track member as a means.

4. The rolling bearing according to claim 1 or 2, wherein, The first outer ring track component and the second outer ring track component each have on their respective outer periphery: an outer peripheral plane extending perpendicularly to the first axial direction; and an outer peripheral wall extending along the first axial direction; The first outer ring body and the first outer ring track component, and the second outer ring body and the second outer ring track component, respectively abut against each other on the outer peripheral plane and the outer peripheral wall. The first inner ring track member and the second inner ring track member each have: an inner circumferential plane extending perpendicularly to the first axis; and an inner circumferential wall extending along the first axis on their respective inner peripheries; The first inner ring body and the first inner ring track component, and the second inner ring body and the second inner ring track component respectively abut against each other on the inner peripheral plane and the inner peripheral wall.

5. The rolling bearing according to claim 1 or 2, wherein, The first outer ring track component, the second outer ring track component, the first inner ring track component, and the second inner ring track component are made of steel. The first outer ring body, the second outer ring body, the first inner ring body, and the second inner ring body are all made of ceramic.

6. The rolling bearing according to claim 1 or 2, wherein, When viewing the rolling bearing along the first axial plane, The outer contour of the outer ring includes a portion that is concave radially inward than the virtual outer contour circle centered on the central axis and passing through the portion of the outer contour of the outer ring furthest from the central axis. The inner contour of the inner ring includes a portion that is concave radially outward than the virtual inner contour circle centered on the central axis and passing through the portion of the inner contour of the inner ring closest to the central axis.

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