Shaft sleeve and rotating structure

Abstract

The shaft sleeve comprises a shaft sleeve body, a plurality of concave holes are formed in the inner wall of a shaft hole of the shaft sleeve body, solid self-lubricating materials with the heating expansion characteristic are embedded in the concave holes, and the spare positions, above the solid self-lubricating materials, in the concave holes are filled with metal-philic lubricating media. According to the utility model, when the temperature of the shaft sleeve rises in the using process, the temperature rise enables the solid self-lubricating material to expand, so that the metal-philic lubricating medium in the concave hole is extruded out, and the metal-philic lubricating medium on the surface of the inner wall of the shaft hole can be automatically supplied under the condition that the machine is not stopped.

Description

Technical Field

[0001] The utility model relates to the technical field of rotating structures, and particularly relates to a shaft sleeve and a rotating structure. Background Art

[0002] Shaft sleeves are basic accessories commonly used at the hinge points of main components of construction machinery such as boom arms, swing arms, tie rods, and grabs, and are widely used in various construction machinery such as excavators, loaders, and bulldozers. With the improvement of the service life and reliability requirements of machinery, the usage requirements for shaft sleeve products have also increased accordingly. One of the key points is to require the lubrication performance maintenance interval to be as long as possible, or even maintenance-free within the service life cycle. However, the lubrication performance maintenance cycle of the existing shaft sleeves is short, and it is easy to shorten the service life of the shaft sleeve due to untimely lubrication performance maintenance. Moreover, more importantly, the existing shaft sleeves cannot achieve automatic replenishment of the lubricating medium without stopping the machine. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the utility model provides a shaft sleeve that can achieve automatic replenishment of the lubricating medium without stopping the machine.

[0004] To achieve the above object, the utility model is realized through the following technical solutions:

[0005] A shaft sleeve includes a shaft sleeve body. A plurality of concave holes are formed on the inner wall of the shaft hole of the shaft sleeve body. A solid self-lubricating material with a characteristic of thermal expansion is embedded in the concave holes, and a metalophilic lubricating medium is filled in the remaining position above the solid self-lubricating material in the concave holes.

[0006] Further, the concave hole sequentially includes a frustum-shaped hole section, a cylindrical hole section, and a conical hole section from the hole surface to the inner direction, and the frustum-shaped hole section, the cylindrical hole section, and the conical hole section are coaxially arranged up and down.

[0007] Further, the included angle α1 between the inclined side wall of the frustum-shaped hole section and the central axis is greater than 30°, and the included angle α2 between the inclined side wall of the conical hole section and the central axis is greater than 75°.

[0008] Further, the diameter of the open end of the frustum-shaped hole section is 0.6 mm to 4 mm larger than the diameter of the cylindrical hole section.

[0009] Further, the solid self-lubricating material is embedded and fixed in the cylindrical hole section of the concave hole, and the thickness of the solid self-lubricating material is less than the hole depth of the cylindrical hole section.

[0010] Further, the metalophilic lubricating medium has a brand number of Mobil XHP322 mine.

[0011] Further, the concave hole is a blind hole structure.

[0012] Furthermore, a preset convexity is formed on the inner wall of the bushing body from the middle to both ends, so that both ends of the bushing body are in a flared shape, and the convexity value h of the preset convexity is 0.01 - 0.2 mm.

[0013] Based on the same inventive concept, the present utility model also provides a rotating structure, which includes a mandrel made of metal and any one of the above bushings, and the mandrel is correspondingly assembled in the shaft hole of the bushing body.

[0014] Furthermore, the metalophilic lubricating medium filled in the concave holes is configured to adhere to the metal surface of the mandrel through its metalophilic property, and transfer to the friction area between the mandrel and the inner wall of the bushing body to participate in lubrication as the mandrel rotates relative to the bushing body.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the bushing and the rotating structure of the present utility model, when the temperature rises during the use of the bushing, the temperature rise will cause the solid self-lubricating material to expand, and then extrude the metalophilic lubricating medium in the concave holes. Thus, the automatic supply of the metalophilic lubricating medium on the inner wall surface of the shaft hole can be realized without shutting down the machine. And, in some working conditions, the solid self-lubricating material that expands and protrudes from the concave holes can also participate in lubrication, effectively improving the problem of wear on the inner wall of the shaft hole of the bushing body, which is beneficial to improving the service life of the bushing. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the bushing body in the first embodiment of the present utility model.

[0018] Figure 2 is a partial structural diagram of the concave hole in the first embodiment of the present utility model.

[0019] Figure 3 is a partial structural diagram of the bushing in the first embodiment of the present utility model.

[0020] Figure 4 is a partial structural diagram of the bushing body in the second embodiment of the present utility model.

[0021] Label Description:

[0022] 1. Bushing body, 2. Metalophilic lubricating medium, 3. Solid self-lubricating material, 11. Concave hole, 111. Frustum hole section, 112. Cylindrical hole section, 113. Conical hole section. Detailed Embodiments

[0023] The present utility model will be further described below with reference to the drawings and embodiments.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0025] Embodiment 1

[0026] Please refer to the attached Figure 1 to the attached Figure 3 As shown in the figures, an embodiment of the present utility model provides a bushing, which includes a bushing body 1. A plurality of concave holes 11 are formed on the inner wall of the shaft hole of the bushing body 1. A solid self-lubricating material 3 with a characteristic of thermal expansion is embedded in the concave holes 11, and a metalophilic lubricating medium 2 is filled in the vacant position above the solid self-lubricating material 3 in the concave holes 11. It can be understood that in this embodiment, when the bushing has a temperature rise during use, the temperature rise will cause the solid self-lubricating material 3 to expand, and then extrude the metalophilic lubricating medium 2 in the concave holes 11. Thus, the automatic supply of the metalophilic lubricating medium on the inner wall surface of the shaft hole can be realized without shutting down the machine. The metalophilic lubricating medium 2 can adhere to the metal surface of the mandrel through its metalophilic characteristic (the so-called metalophilic characteristic means that the lubricating medium can adhere to the metal shaft surface and then be brought into the friction area when the shaft rotates), and transfer to the friction area between the mandrel and the inner wall of the bushing body 1 to participate in lubrication as the mandrel rotates relative to the bushing body 1. And under certain working conditions, the solid self-lubricating material 3 that expands and protrudes from the concave holes 11 can also participate in lubrication, effectively improving the problem of wear on the inner wall of the shaft hole of the bushing body 1 and being beneficial to improving the service life of the bushing.

[0027] Please refer to the attached Figure 1 to the attached Figure 3 As shown in the figures, in a preferred embodiment, the concave hole is a blind hole structure. The concave hole 11 sequentially includes a frustum-shaped hole section 111, a cylindrical hole section 112, and a conical hole section 113 from the hole surface to the inner direction, and the frustum-shaped hole section 111, the cylindrical hole section 112, and the conical hole section 113 are coaxially arranged up and down. Preferably, the included angle α1 between the inclined side wall of the frustum-shaped hole section 111 and the central axis is greater than 30°, and the included angle α2 between the inclined side wall of the conical hole section 113 and the central axis is greater than 75°. In a preferred embodiment, the diameter of the open end of the frustum-shaped hole section 111 is 0.6 mm to 4 mm larger than the diameter of the cylindrical hole section 112. In this way, it is beneficial to improve the fat storage capacity and chip storage effect of the concave hole 11.

[0028] Please refer to the attached Figure 1 to the attached Figure 3, in a preferred embodiment, the solid self-lubricating material 3 is embedded and fixed in the cylindrical hole section 112 of the concave hole 11, and the thickness of the solid self-lubricating material 3 is less than the hole depth of the cylindrical hole section 112. The concave hole 11 with a three-section structure is more conducive to inlaying and fixing the solid self-lubricating material 3 than the existing concave hole structure with a composite conical structure.

[0029] Please refer to the appendix Figure 1 to the appendix Figure 3 , in a preferred embodiment, the metalophilic lubricating medium 2 has the brand name Mobil XHP322 mine (NLGI: type 2). However, those skilled in the art should understand that in other embodiments, the metalophilic lubricating medium 2 can also be other metalophilic lubricating media in the prior art that have the same or similar properties as the metalophilic lubricating medium with the brand name Mobil XHP322 mine (NLGI: type 2), and is not limited to the specific implementation disclosed in this embodiment.

[0030] An embodiment of the present utility model further provides a rotating structure, including a mandrel made of metal and the bushing of any of the above embodiments, and the mandrel is correspondingly assembled in the shaft hole of the bushing body 1; preferably, the surface of the mandrel is chromium-plated, and the surface hardness of the mandrel is 58HRC - 62HRC.

[0031] Please refer to the appendix Figure 1 to the appendix Figure 3 , in a preferred embodiment, the metalophilic lubricating medium 2 filled in the concave hole 11 is configured to adhere to the metal surface of the mandrel through its metalophilic property, and transfer to the friction area between the mandrel and the inner wall of the bushing body 1 to participate in lubrication as the mandrel rotates relative to the bushing body 1.

[0032] Embodiment Two

[0033] Please refer to the appendix Figure 4 , the difference between this embodiment and Embodiment One is that the inner wall of the bushing body 1 is formed with a preset convexity from the middle to both ends, so that both ends of the bushing body 1 are in a flared shape, and the convexity value h of the preset convexity is 0.01 mm - 0.2 mm. With such a setting, it is beneficial to reduce the contact stress at the edge of the bushing, and thus beneficial to improve the service life of the bushing.

[0034] As mentioned above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements 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 of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims

1. A bushing, characterized in that: It includes a bushing body (1). A number of concave holes (11) are formed on the inner wall of the axial hole of the bushing body (1). A solid self-lubricating material (3) with a characteristic of thermal expansion is embedded in the concave holes (11), and a metalophilic lubricating medium (2) is filled in the vacant position above the solid self-lubricating material (3) in the concave holes (11).

2. The bushing according to claim 1, wherein: The concave hole (11) sequentially includes a frustum-shaped hole section (111), a cylindrical hole section (112), and a conical hole section (113) from the hole surface to the inner direction, and the frustum-shaped hole section (111), the cylindrical hole section (112), and the conical hole section (113) are coaxially arranged up and down.

3. The bushing according to claim 2, wherein: The included angle α1 between the inclined side wall of the frustum-shaped hole section (111) and the central axis is greater than 30°, and the included angle α2 between the inclined side wall of the conical hole section (113) and the central axis is greater than 75°.

4. The bushing according to claim 3, wherein: The diameter of the open end of the frustum-shaped hole section (111) is 0.6 mm to 4 mm larger than the diameter of the cylindrical hole section (112).

5. The bushing according to claim 4, characterized in that: The solid self-lubricating material (3) is embedded and fixed in the cylindrical hole section (112) of the concave hole (11), and the thickness of the solid self-lubricating material (3) is less than the hole depth of the cylindrical hole section (112).

6. The bushing according to claim 1, characterized in that: The concave hole (11) is a blind hole structure.

7. The bushing according to any one of claims 1 to 6, characterized in that: The inner wall of the bushing body (1) forms a preset convexity from the middle to both ends, so that both ends of the bushing body (1) are in a flared shape, and the convexity value h of the preset convexity is 0.01 mm to 0.2 mm.

8. A rotating structure, characterized in that: It includes a mandrel made of a metal material and the bushing according to any one of claims 1 to 7, and the mandrel is correspondingly assembled in the axial hole of the bushing body (1).

9. The rotating structure according to claim 8, wherein: The metalophilic lubricating medium (2) filled in the concave hole (11) is configured to adhere to the metal surface of the mandrel through its metalophilic property, and transfer to the friction area between the mandrel and the inner wall of the bushing body (1) to participate in lubrication as the mandrel rotates relative to the bushing body (1).

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