Rod end knuckle bearing

Abstract

The invention discloses a rod end knuckle bearing which comprises a rod end body and an inner ring, a rod end eye hole is formed in the rod end body, the inner ring is installed in the rod end eye hole, a self-lubricating gasket is arranged between the inner spherical surface of the rod end eye hole and the outer spherical surface of the inner ring, and a circular convex ring is formed at the end of the inner ring. A limiting lug plate corresponding to the circular convex ring is arranged on the rod end body, and the limiting lug plate is in abutting fit with the circumferential side face of the circular convex ring so as to achieve the anti-swing limiting effect in the specified direction when the inner ring rotates relative to the rod end body. The limiting lug plates are in limiting fit with the outer cylindrical surface of the circular convex ring, so that the anti-tilting limiting effect of the inner ring in the specified direction is achieved, the anti-tilting limiting device can be better applied to application scenes such as robot joints with the anti-tilting requirement in the specified direction, the joint movement stability is improved, and the stability of the joint movement is improved. And the overall structure is simple and practical, the limiting stability is high, machining and production are facilitated, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and specifically to a rod end joint bearing. Background Technology

[0002] In robots, joint bearings are typically used to realize joint movement structures. In order to improve the stability of joint movement in certain positions, a limiting structure is usually set on the joint bearing to provide a one-way anti-sway limiting effect on the inner ring rotation. However, the existing limiting structures are relatively complex and have drawbacks such as difficulty in processing and high processing costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a rod end spherical bearing with a simple and practical overall structure, high limiting stability, and is beneficial for processing and production, thus reducing costs.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: A rod end spherical bearing includes a rod end body and an inner ring. A rod end eye is formed on the rod end body, and the inner ring is installed in the rod end eye. A self-lubricating gasket is provided between the inner spherical surface of the rod end eye and the outer spherical surface of the inner ring. A circular convex ring is formed on the end of the inner ring. A limiting lug corresponding to the circular convex ring is provided on the rod end body. The limiting lug engages with the outer cylindrical surface of the circular convex ring to provide a directional anti-sway limiting effect on the rotation of the inner ring relative to the rod end body.

[0005] Furthermore, the self-lubricating pad between the inner spherical surface of the rod end eye and the outer spherical surface of the inner ring is configured to extend integrally to form a self-lubricating ear that fits against the inner sidewall of the limiting ear plate. The self-lubricating ear includes a self-lubricating surface that fits against the outer spherical surface of the inner ring and a limiting surface that makes zero-gap contact with the outer cylindrical surface of the circular convex ring for limiting engagement.

[0006] Furthermore, the limiting surface is a flat surface structure, and the limiting surface and the outer cylindrical surface of the circular convex ring are in line contact type abutting limiting fit. The normal direction of the limiting surface is defined as the specified anti-sway direction. Through the line contact type zero clearance abutting limiting fit between the limiting surface and the outer cylindrical surface of the circular convex ring, the rotation of the inner ring relative to the rod end body is generated along the specified anti-sway direction to produce an anti-sway limiting effect.

[0007] Furthermore, two symmetrically arranged limiting ear plates are provided at the end position of the rod end body corresponding to the circular convex ring.

[0008] Furthermore, the two limiting surfaces are arranged parallel to each other and simultaneously form a line contact limiting fit with the circular convex ring.

[0009] Furthermore, the limiting ear plate is configured to be integrally machined with the rod end body.

[0010] Furthermore, the inner spherical surface of the rod end eyelet has an arcuate surface located in the middle and conical surfaces located at both ends of the arcuate surface.

[0011] Furthermore, the radius of the curved surface is different from the radius of the outer sphere of the inner circle.

[0012] Furthermore, the radius of the curved surface is smaller than the radius of the outer spherical surface of the inner circle.

[0013] Furthermore, the rod end spherical bearing is an ultra-micro spherical bearing structure with an outer diameter of less than 6.6 mm.

[0014] The above technical solution has the following advantages or beneficial effects: In the rod end joint bearing described in this invention, a limiting lug is directly provided at the end position of the rod end body, and a circular convex ring that mates with the limiting lug is provided on the inner ring. The limiting lug and the outer cylindrical surface of the circular convex ring provide limiting engagement, thereby achieving the effect of anti-tilt limiting of the inner ring in a specified direction. This allows it to be better applied to application scenarios with anti-tilt requirements in specific directions, such as robot joints, thereby improving joint motion stability. Furthermore, its overall structure is relatively simple and practical, with high limiting stability, and it is beneficial for processing and production, reducing costs. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the rod end joint bearing according to an embodiment of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the rod end joint bearing according to another embodiment of the present invention.

[0017] Figure 3 This is an exploded three-dimensional structural diagram of the rod end joint bearing according to an embodiment of the present invention.

[0018] Figure 4 This is an exploded three-dimensional structural diagram of the rod end joint bearing according to another embodiment of the present invention.

[0019] Figure 5 This is a top view of the rod end joint bearing according to an embodiment of the present invention.

[0020] Figure 6 yes Figure 5 AA section view in the image.

[0021] Labeling explanation: 1. Rod end body, 2. Inner ring, 3. Self-lubricating liner, 11. Rod end eye, 12. Limiting ear plate, 21. Circular convex ring, 31. Self-lubricating ear, 111. Arc surface, 112. Conical surface, 311. Self-lubricating surface, 312. Limiting surface. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Please refer to the appendix. Figure 1 To be continued Figure 6 An embodiment of the present invention provides a rod end spherical bearing, including a rod end body 1 and an inner ring 2. A rod end eyelet 11 is provided on the rod end body 1, and the inner ring 2 is installed in the rod end eyelet 11. A self-lubricating gasket 3 is provided between the inner spherical surface of the rod end eyelet 11 and the outer spherical surface of the inner ring 2. A circular protruding ring 21 is formed on the end of the inner ring 2. A limiting ear plate 12 corresponding to the circular protruding ring 21 is provided on the rod end body 1. The limiting ear plate 12 abuts against the outer cylindrical surface of the circular protruding ring 21 to generate a specified directional anti-sway limiting effect on the rotation of the inner ring 2 relative to the rod end body 1. It is understood that in this embodiment, by directly setting a limiting ear plate 12 at the end position of the rod end body 1, and simultaneously setting a circular convex ring 21 on the inner ring 2 that cooperates with the limiting ear plate 12, the limiting ear plate 12 and the outer cylindrical surface of the circular convex ring 21 perform limiting cooperation, thereby achieving the effect of anti-tilting limiting of the inner ring 2 in a specified direction. This allows it to be better applied to application scenarios with anti-tilting requirements in specific directions, such as robot joints, thereby improving the stability of joint movement. Moreover, its overall structure is relatively simple and practical, with high limiting stability, and it is conducive to processing and production, reducing costs.

[0025] Please refer to the appendix. Figure 1 To be continued Figure 6In one preferred embodiment, the self-lubricating pad 3 disposed between the inner spherical surface of the rod end eyelet 11 and the outer spherical surface of the inner ring is configured to integrally extend to form a self-lubricating ear 31 that conforms to the inner sidewall of the limiting ear plate 12. The self-lubricating ear 31 includes a self-lubricating surface 311 that conforms to the outer spherical surface of the inner ring 2 and a limiting surface 312 that makes zero-gap contact limiting fit with the outer cylindrical surface of the circular convex ring 21. In this embodiment, preferably, the limiting surface 312 has a flat surface structure, and the limiting surface 312 makes line contact limiting fit with the outer cylindrical surface of the circular convex ring 21. The normal direction of the limiting surface 312 is defined as the specified anti-sway direction. The line contact zero-gap limiting fit between the limiting surface 312 and the outer cylindrical surface of the circular convex ring 21 generates an anti-sway limiting effect on the rotation of the inner ring 2 relative to the rod end body 1 along the specified anti-sway direction. In this embodiment, the line contact limiting fit between the flat surface limiting surface 312 and the circular convex ring 21 serves two purposes: firstly, it prevents the inner ring 2 from tilting along the normal direction of the limiting surface 312; secondly, the circular convex ring 21 does not restrict the axial rotation of the inner ring 2 or its tilting motion in non-specified directions (i.e., the circular convex ring 21 can move against the flat surface limiting surface to allow the inner ring 2 to tilt and rotate relative to the rod end body 1 in other directions). Furthermore, by integrally molding a self-lubricating lug 31 onto the self-lubricating pad 3, the rotational friction between the inner ring 2 and the rod end body 1 is further reduced, improving the smoothness of rotation and service life of the inner ring, and shortening the process route and reducing production costs. In this embodiment, the self-lubricating pad 3 is an injection-molded self-lubricating pad structure. Because it is injection-molded, it achieves a zero-clearance fit between the limiting surface and the outer cylindrical surface of the circular convex ring 21, thus achieving a 100% limiting effect and improving the robot's motion stability. Furthermore, after the injection molding process, the rod end spherical bearing only requires one clearance treatment process, resulting in a shorter overall process route and significantly reduced costs compared to the existing cross shaft limiting mechanism.

[0026] Please refer to the appendix. Figure 1 To be continued Figure 6 In one preferred embodiment, two symmetrically arranged limiting lugs 12 are provided at the end position of the rod end body 1 corresponding to the circular protruding ring 21. Preferably, in this embodiment, the two limiting surfaces 312 are arranged parallel to each other and simultaneously form a line contact limiting fit with the circular protruding ring 21. However, those skilled in the art should understand that in other embodiments, the number and position of the limiting lugs 12 on the rod end body 1 are not limited to the specific implementation disclosed in this embodiment, and those skilled in the art can set them according to specific needs.

[0027] Please refer to the appendix. Figure 1 To be continued Figure 6In one preferred embodiment, the rod end spherical bearing is an ultra-micro spherical bearing structure with an outer diameter of less than 6.6 mm. The limiting ear plate 12 is configured to be integrally machined with the rod end body 1. In this embodiment, since the rod end spherical bearing is an ultra-micro bearing structure with a small size, and the limiting ear plate 12 is integrally machined, the machining difficulty of the limiting ear plate can be reduced, and the robustness of the limiting ear plate 12 can be improved, thereby enhancing the anti-sway limiting stability.

[0028] Please refer to the appendix. Figure 1 To be continued Figure 6 In one preferred embodiment, the inner spherical surface of the rod end eyelet 11 has an arcuate surface 111 located in the middle and conical surfaces 112 located at both ends of the arcuate surface 111. In this embodiment, preferably, the radius of the arcuate surface 111 is different from the radius of the outer spherical surface of the inner ring 2. Further, the radius of the arcuate surface 111 is smaller than the radius of the outer spherical surface of the inner ring 2. This arrangement can improve the installation stability between the self-lubricating pad 3 and the inner spherical surface of the rod end body 1, so as to prevent unnecessary displacement of the self-lubricating pad 3 and causing difficulty in rotating the inner ring 2.

[0029] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. A rod end spherical bearing, characterized in that: The device includes a rod end body and an inner ring. The rod end body has a rod end eye hole, and the inner ring is installed in the rod end eye hole. A self-lubricating gasket is provided between the inner spherical surface of the rod end eye hole and the outer spherical surface of the inner ring. A circular convex ring is formed at the end of the inner ring. A limiting ear plate corresponding to the circular convex ring is provided on the rod end body. The limiting ear plate and the outer cylindrical surface of the circular convex ring abut against each other to provide a specified directional anti-sway limiting effect on the rotation of the inner ring relative to the rod end body.

2. The rod end joint bearing according to claim 1, characterized in that: The self-lubricating gasket between the inner spherical surface of the rod end eye and the outer spherical surface of the inner ring is configured as an integral extension forming a self-lubricating lug that fits against the inner sidewall of the limiting lug plate. The self-lubricating lug includes a self-lubricating surface that fits against the outer spherical surface of the inner ring and a limiting surface that abuts against and limits the outer cylindrical surface of the circular convex ring. By achieving a zero-clearance fit between the limiting surface and the outer cylindrical surface of the circular convex ring, the anti-sway function of the inner ring relative to the rod end body in the direction of the limiting lug plate is achieved.

3. The rod end joint bearing according to claim 2, characterized in that: The limiting surface is a flat surface structure, and the limiting surface and the outer cylindrical surface of the circular convex ring are in line contact with each other with zero clearance. The normal direction of the limiting surface is defined as the specified anti-sway direction. The line contact between the limiting surface and the outer cylindrical surface of the circular convex ring generates an anti-sway limiting effect on the rotation of the inner ring relative to the rod end body along the specified anti-sway direction.

4. The rod end joint bearing according to claim 3, characterized in that: Two symmetrically arranged limiting ears are provided at the end position of the rod end body corresponding to the circular convex ring.

5. The rod end joint bearing according to claim 4, characterized in that: The two limiting surfaces are set parallel to each other and simultaneously form a line contact limiting fit with the circular convex ring.

6. The rod end joint bearing according to claim 1, characterized in that: The limiting lug is configured to be integrally machined with the rod end body.

7. The rod end joint bearing according to claim 1, characterized in that: The inner spherical surface of the rod end eyelet has an arcuate surface in the middle and conical surfaces at both ends of the arcuate surface.

8. The rod end joint bearing according to claim 7, characterized in that: The radius of the curved surface is different from the radius of the inner outer sphere.

9. The rod end joint bearing according to claim 8, characterized in that: The radius of the curved surface is smaller than the radius of the outer sphere of the inner circle.

10. The rod end joint bearing according to any one of claims 1 to 9, characterized in that: The rod end spherical bearing is an ultra-micro spherical bearing structure with an outer diameter of less than 6.6 mm.

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