Rolling bearing

Abstract

A rolling bearing, comprising: a cylindrical rolling body (10); and a retainer (20), which comprises a cross beam (21) extending in an axial direction (A) and comprising a guide surface (211) configured to abut against a raceway surface (11) of the cylindrical rolling body (10), wherein in a radial direction, the cross beam (21) has no retaining force on the cylindrical rolling body (10), the cross beam (21) is located on an inner side of the radial direction (R) of a bearing pitch circle of the cylindrical rolling body, and the guide surface (211) is a curved surface matching the raceway surface (11) of the cylindrical rolling body (10). The guide surface (211) is the curved surface having a certain curvature in the radial direction (R), and the guide surface (211) of the cross beam (21) below the pitch circle is attached to the raceway surface (11) of the cylindrical rolling body (10) as much as possible, thereby increasing a contact area between the cylindrical rolling body (10) and the guide surface (211) of the cross beam (21), so as to reduce the contact stress between the retainer (20) and the cylindrical rolling body (10) and the wear between the raceway surface (11) of the cylindrical rolling body (10) and the guide surface (211), thereby avoiding an early failure of the bearing caused by the wear of the raceway surface (11) of the cylindrical rolling body (10), and prolonging the service life of the bearing.

Description

rolling bearings Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a rolling bearing. Background Art

[0002] In related technologies, the contact surface between the crossbeam of the stamped steel retaining frame and the cylindrical rolling element is usually an inclined straight surface. In actual operation, the contact part between the crossbeam of the retaining frame and the cylindrical rolling element is a contact point from a radial cross-sectional view, and there is a contact line between the crossbeam of the retaining frame and the cylindrical rolling element in the axial direction.

[0003] In actual applications, the surface coating of the cylindrical rolling element in the contact area has severe friction. For example, bright wear marks appear on the surface of the cylindrical rolling element due to wear, which can easily cause early failure of the bearing due to the wear of the cylindrical rolling element.

[0004] Summary of the Invention

[0005] In order to overcome the problems existing in the related art, the present invention provides a rolling bearing.

[0006] According to the first aspect of an embodiment of the present invention, the present invention provides a rolling bearing, comprising: a cylindrical rolling element; and a retaining frame, the retaining frame comprising an axially extending crossbeam, the crossbeam comprising a guide surface for contacting and guiding the raceway surface of the cylindrical rolling element, wherein in the radial direction, the crossbeam has no retaining force on the cylindrical rolling element, and the crossbeam is located radially inside the pitch circle of the rolling bearing, and the guide surface is a radial curved surface that matches the raceway surface of the cylindrical rolling element.

[0007] In some embodiments, the guide surfaces are axially located at both axial ends of the beam.

[0008] In some embodiments, the crossbeam further includes a non-guide surface that is not in contact with the cylindrical rolling element, and the non-guide surface is located radially inward of the guide surface and connected to the radially inner side of the guide surface.

[0009] In some embodiments, in a radial cross section, a curvature radius of the guide surface is greater than or equal to a radius of the cylindrical rolling element.

[0010] In some embodiments, the retaining frame further includes: a first side beam connected to one axial end of the crossbeam; and a second side beam connected to the other axial end of the crossbeam, wherein the first side beam, the second side beam and the crossbeam are integrally formed.

[0011] In some embodiments, the retainer is made of a metal material.

[0012] The technical solution provided by the embodiments of the present invention may include the following beneficial effects: the guiding surface is a curved surface with a certain curvature in the radial direction, which can make the guiding surface of the beam located below the pitch circle of the cylindrical rolling element bearing fit as closely as possible with the raceway surface of the cylindrical rolling element, thereby increasing the contact area between the cylindrical rolling element and the guiding surface of the beam, so as to reduce the contact stress between the retaining frame and the cylindrical rolling element, reduce the wear between the raceway surface and the guiding surface of the cylindrical rolling element, avoid premature failure of the bearing caused by wear of the raceway surface of the cylindrical rolling element, and extend the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0014] FIG1 is a perspective view of a retainer according to an exemplary embodiment;

[0015] FIG2 is a schematic diagram of a portion of the structure of the retainer in FIG1 ;

[0016] FIG. 3 is a side view of a retainer and cylindrical rolling elements according to an exemplary embodiment. DETAILED DESCRIPTION

[0017] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0018] In the present invention, unless otherwise specified, the axial direction A, radial direction R and circumferential direction W refer to the axial direction A, radial direction R and circumferential direction W of the retainer respectively; one axial end refers to the left end in Figures 1 and 2, and the other axial end A refers to the right end in Figures 1 and 2; the radial outer side refers to the upper end in Figure 3, and the radial inner side refers to the lower end in Figure 3.

[0019] To solve the above technical problems, the present invention provides a rolling bearing. The rolling bearing at least includes a cylindrical rolling element 10 and a cage 20.

[0020] As shown in Figures 1 and 2, the retainer 20 includes at least a plurality of cross beams 21 extending in the axial direction A, a first side beam 22, and a second side beam 23. The first side beam 22 and the second side beam 23 are circular. In this embodiment, the rolling element 10 is a cylindrical rolling element 10, so the first side beam 22 and the second side beam 23 can be the same size.

[0021] Furthermore, the first side beam 22 is connected to one axial end of the cross beam 21, and the second side beam 23 is connected to the other axial end of the cross beam 21, that is, multiple cross beams 21 are located between the first side beam 22 and the second side beam 23 along the axial direction A, and multiple cross beams 21 are evenly distributed along the circumferential direction.

[0022] Furthermore, the first side beam 22, the second side beam 23, and the cross beam 21 are integrally formed. This integrally formed retainer 20 provides a more stable structure. The first side beam 22, the second side beam 23, and the cross beam 21 are integrally formed from a metal material, preferably stainless steel. This metal material ensures the strength of the retainer 20 and prevents deformation.

[0023] Furthermore, multiple crossbeams 21 are arranged parallel and spaced apart along the circumferential direction W. Pockets 24 are formed between adjacent crossbeams 21, and the cylindrical rolling elements 10 are positioned in the pockets 24. Each crossbeam 21 includes a guide surface 211 for abutting the raceway surface 11 of the cylindrical rolling element 10. The raceway surface 11 of the cylindrical rolling element 10 is the cylindrical outer surface of the cylindrical rolling element 10 extending along the axial direction A.

[0024] Each crossbeam 21 is provided with guide surfaces 211 on both sides along the circumferential direction W. Therefore, one pocket 24 includes the opposite guide surfaces 211 of two adjacent crossbeams 21. The opposite guide surfaces 211 are in contact with the raceway surface 11 of the cylindrical rolling element 10.

[0025] The pocket 24 is a roughly square hole. Preferably, the pocket 24 is a roughly rectangular hole, which matches the axial cross-section of the cylindrical rolling element 10 (the axial cross-section refers to the cross-section made parallel to the central axis of the cylindrical rolling element 10), so that when the crossbeam 21 of the retaining frame 20 abuts against the raceway surface 11 of the cylindrical rolling element 10, especially in the axial direction A, the relative guide surfaces 211 in the pocket 24 are in contact with the raceway surface 11 of the cylindrical rolling element 10 as much as possible and the contact stress is the same.

[0026] Furthermore, the cross beam 21 has no retaining force on the cylindrical rolling element 10 in the radial direction R, that is, the retaining frame 20 does not restrict the radial movement of the cylindrical rolling element 10, and the cylindrical rolling element 10 can be easily removed from or installed into the pocket 24 of the retaining frame 20.

[0027] The crossbeam 21 can be located radially outside or radially inside the pitch circle of the cylindrical rolling element bearing. In this embodiment, the crossbeam 21 is located radially inside the pitch circle of the cylindrical rolling element bearing. When the cylindrical rolling element 10 interacts with the crossbeam 21, the crossbeam 21 of the retaining frame 20 applies a force on the cylindrical rolling element 10 that is generally toward the center axis of the cylindrical rolling element 10. As shown in FIG3 , the guide surface 211 is a curved surface with a certain curvature in the radial direction, which can make the guide surface 211 of the crossbeam 21 located below the pitch circle of the cylindrical rolling element bearing fit as closely as possible with the raceway surface 11 of the cylindrical rolling element 10, thereby increasing the contact area between the raceway surface 11 of the cylindrical rolling element 10 and the guide surface 211 of the crossbeam 21, so as to reduce the contact stress between the retaining frame 20 and the cylindrical rolling element 10, reduce the wear between the raceway surface 11 of the cylindrical rolling element 10 and the guide surface 211, avoid premature failure of the bearing caused by wear of the raceway surface 11 of the cylindrical rolling element 10, and extend the service life of the bearing.

[0028] The pitch circle refers to the circle where the central axis of the cylindrical rolling element 10 of the rolling bearing is located.

[0029] In some embodiments, the entire axial direction A of the crossbeam 21 can be a guide surface 211, that is, the entire crossbeam 21 in the axial direction A can abut against the cylindrical rolling element 10. In this embodiment, the guide surfaces 211 are located at both ends of the axial direction A of the crossbeam 21 along the axial direction A. Specifically, as shown in Figures 1 and 2, along the axial direction A, the middle part of the crossbeam 21 is recessed in the direction away from the raceway surface 11 of the cylindrical rolling element 10, so that there is a gap between the middle part of the crossbeam 21 and the cylindrical rolling element 10, and they do not abut. In this way, the raceway surface 11 of the cylindrical rolling element 10 is prevented from abutting and wearing against the crossbeam 21 in the entire axial direction A, thereby reducing the wear length in the axial direction A.

[0030] In addition, the two guide surfaces 211 at both ends of the crossbeam 21 in the axial direction A are symmetrically arranged along the center point of the crossbeam 21 in the axial direction A, so that the crossbeam 21 and the cylindrical rolling element 10 can be subjected to uniform force in the axial direction A.

[0031] In some embodiments, as shown in Figure 3, the beam 21 also includes a non-guide surface 212 that does not contact the cylindrical rolling element 10. In this embodiment, the beam 21 of the retaining frame 20 is located radially inside the pitch circle of the cylindrical rolling element bearing. Therefore, the non-guide surface 212 is located radially inside the guide surface 211 and is connected to the radial inside of the guide surface 211. The non-guide surface 212 does not abut the raceway surface 11 of the cylindrical rolling element 10.

[0032] The non-guide surface 212 can prevent the guide surface 211 from occupying the entire radial thickness of the beam 21, thereby avoiding overly sharp and weak structures in the pocket 24, and preventing the sharp and weak structures from being bent, warped or broken during the long-term friction between the beam 21 and the cylindrical rolling element 10 and remaining between the guide surface 211 and the raceway surface 11 of the cylindrical rolling element 10, thereby causing wear or even failure of the raceway surface 11 of the cylindrical rolling element 10.

[0033] In a radial cross section, the radius of curvature of the guide surface 211 of the crossbeam 21 may not coincide with the radius of the cylindrical rolling element 10. For example, in some embodiments, the radius of curvature of the guide surface 211 is greater than or equal to the radius of the cylindrical rolling element 10. A radial cross section refers to a cross section perpendicular to the central axis of the retainer 20 or the cylindrical rolling element 10.

[0034] Therefore, in actual assembly, there may be a gap between the cylindrical rolling element 10 and the pocket 24 (i.e., the guide surface 211 of the beam 21), and the gap can affect the radial R movement between the cylindrical rolling element 10 and the retaining frame 20, and the radial R movement can affect the stability and noise of the entire rolling bearing during operation.

[0035] The width of the non-guide surface 212 can be set according to design requirements and is not specifically limited here.

[0036] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are used solely to distinguish structures of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, a first structure could be referred to as a second structure, and similarly, a second structure could be referred to as a first structure without departing from the scope of the present invention.

[0037] It should be further understood that the terms "center", "longitudinal", "lateral", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0038] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0039] It should be understood that the present invention is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims

1. A rolling bearing, characterized in that: include: A cylindrical rolling element (10); and A retainer (20), the retainer (20) comprising a crossbeam (21) extending in the axial direction (A), the crossbeam (21) comprising a guide surface (211) for contacting and guiding the raceway surface (11) of the cylindrical rolling element (10), Wherein, in the radial direction (R), the crossbeam (21) has no retaining force on the cylindrical rolling element (10), and the crossbeam (21) is located radially inside the pitch circle of the rolling bearing, and the guide surface (211) is a radial curved surface that matches the raceway surface (11) of the cylindrical rolling element (10).

2. The rolling bearing according to claim 1, characterized in that: The guide surfaces (211) are located at two axial ends of the crossbeam (21) along the axial direction (A).

3. The rolling bearing according to claim 1, characterized in that: The cross beam (21) further comprises a non-guide surface (212) that is not in contact with the cylindrical rolling element (10); the non-guide surface (212) is located radially inward of the guide surface (211) and is connected to the radially inward of the guide surface (211).

4. The rolling bearing according to claim 1, characterized in that: In a radial cross section, the curvature radius of the guide surface (211) is greater than or equal to the radius of the cylindrical rolling body (10).

5. The rolling bearing according to any one of claims 1 to 4, characterized in that: The retaining frame (20) further comprises: A first side beam (22) connected to one axial end of the cross beam (21); and The second side beam (23) is connected to the other axial end of the cross beam (21). Wherein, the first side beam (22), the second side beam (23) and the cross beam (21) are integrally formed.

6. The rolling bearing according to any one of claims 1 to 4, characterized in that: The retaining frame (20) is made of metal material.

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