Self-lubricating ball screw pair

Abstract

The utility model discloses a self-lubricating ball screw pair which comprises a screw nut, a lubricating assembly and a screw shaft, and the lubricating assembly is fixed at one end of the screw nut through a fastener; the lubricating assembly is composed of a shell, a first oil suction part, a spacer ring and a second oil suction part, and the first oil suction part, the spacer ring and the second oil suction part are sequentially stacked to form a layered structure and are arranged in the shell. The shell is filled with lubricating oil or lubricating grease, and the first oil absorption piece and the second oil absorption piece can absorb and guide out the lubricating oil or the lubricating grease and are used for evenly coating the surface of the lead screw shaft with the lubricating oil or the lubricating grease. According to the self-lubricating ball screw pair, manual maintenance is not needed, it is guaranteed that lubricating grease evenly covers the surface of the screw shaft, friction and abrasion are effectively reduced, continuous lubrication is guaranteed through the oil suction piece in redundant design, working efficiency is improved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw rod, more specifically, to a self-lubricating ball screw pair. BACKGROUND

[0002] Ball screw pair, also known as ball screw pair or roll screw pair, is a kind of high-efficiency mechanical transmission device, widely used in numerical control machine tool, automation equipment and precision instrument, and its core function is to convert rotary motion into linear motion, or convert linear motion into rotary motion.In traditional ball screw pair, lubrication is the key to ensure its high efficiency and low loss operation.However, the existing lubrication mode usually relies on artificial periodic smearing lubricating oil, which not only increases the maintenance cost, but also may cause the wear of ball screw pair to aggravate, efficiency to reduce, and even appear to be stuck problem. SUMMARY

[0003] The utility model aims at solving one of the technical problems in the related art to some extent.For this purpose, the utility model provides a self-lubricating ball screw pair, which does not need artificial maintenance, ensures that lubricating oil uniformly covers the surface of screw shaft, effectively reduces friction and wear, and the redundant design of oil suction member ensures continuous lubrication, improves work efficiency and prolongs service life.

[0004] The technical scheme adopted by the utility model is as follows: a self-lubricating ball screw pair is provided, which comprises a screw nut, a lubricating assembly and a screw shaft, the lubricating assembly is fixed at one end of the screw nut through fasteners, the lubricating assembly is composed of a shell, a first oil suction member, a spacer ring and a second oil suction member, the first oil suction member, the spacer ring and the second oil suction member are stacked in turn to form a layered structure and are arranged inside the shell, the inside of the shell is filled with lubricating oil or lubricating grease, the first oil suction member and the second oil suction member can adsorb and guide out the lubricating oil or lubricating grease for uniform coating on the surface of the screw shaft.

[0005] After the above structure is adopted, the self-lubricating ball screw pair can realize automatic and continuous lubrication during operation, without frequent artificial maintenance, which significantly improves the lubrication effect and work efficiency.Through the adsorption and guiding out effect of lubricating oil or lubricating grease inside the shell and the oil suction member, it is ensured that the lubricating oil can uniformly cover the surface of the screw shaft, effectively reducing friction and wear.At the same time, the first oil suction member and the second oil suction member have the function of redundant design, even if one of the oil suction members is degraded due to long-term use, the other oil suction member can still play the lubricating role, so as to ensure the normal operation and lubrication effect of the device.The layered structure design of the lubricating assembly not only makes the storage and conduction of lubricating grease more efficient, thereby prolonging the service life of the ball screw pair.

[0006] According to one embodiment of the present application, the shell is composed of a first shell and a second shell, which are assembled together to form a cavity for accommodating the layered structure; sufficient space is provided for the storage and flow of lubricating oil or grease.

[0007] According to one embodiment of the present application, a screw post is arranged on the first shell and / or the second shell, and the fastener is connected and fixed with the screw nut through the screw post; the fastener is connected and fixed with the screw nut through the screw post, thereby ensuring that the lubricating assembly is firmly installed at one end of the screw nut.

[0008] According to one embodiment of the present application, the screw post is spaced apart from the cavity; the spacing design helps to avoid direct contact of the screw post with the lubricating oil or grease, thereby reducing unnecessary friction and pollution inside the lubricating system.

[0009] According to one embodiment of the present application, a positioning protrusion is arranged on the first shell and / or the second shell, and the screw nut has a positioning groove matched with the positioning protrusion.

[0010] According to one embodiment of the present application, the first oil absorbing member and / or the second oil absorbing member are provided with a through hole for the fastener to pass through.

[0011] According to one embodiment of the present application, the first oil absorbing member and / or the second oil absorbing member are provided with a coating part, and the coating part protrudes out of the shell and contacts the surface of the screw shaft.

[0012] According to one embodiment of the present application, the fastener comprises a screw rod for connecting and fixing the shell and the screw nut. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 It is a perspective view of the ball screw pair in the embodiment of the present application.

[0015] Figure 2 It is an exploded view of the ball screw pair in the embodiment of the present application.

[0016] Figure 3 It is a perspective view of the lubricating assembly in the embodiment of the present application.

[0017] Figure 4This is an exploded view of the lubrication component in an embodiment of this utility model.

[0018] Figure 5 This is a perspective view of the first housing in an embodiment of the present utility model.

[0019] Figure 6 This is a perspective view of the first oil-absorbing component in an embodiment of this utility model.

[0020] Figure 7 This is a perspective view of the lead screw nut in an embodiment of this utility model.

[0021] Figure 8 This is a perspective view of the ball screw assembly after the screw nut has been removed in an embodiment of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 10. Lead screw nut; 20. Lubrication assembly; 30. Lead screw shaft; 40. Fasteners;

[0024] 11. Positioning groove;

[0025] 21. First housing; 22. Second housing; 23. First oil suction element; 24. Spacer ring; 25. Second oil suction element;

[0026] 21a. Screw post; 21b. Positioning protrusion;

[0027] 23a, Through hole; 23b, Coating section. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0029] like Figures 1-8 As shown in this embodiment, the technical solution adopted by this utility model is as follows: a self-lubricating ball screw assembly is provided, including a screw nut 10, a lubrication component 20, and a screw shaft 30. The lubrication component 20 is fixed to one end of the screw nut 10 by a fastener 40. The lubrication component 20 is composed of a shell, a first oil-absorbing element 23, a spacer ring 24, and a second oil-absorbing element 25. The first oil-absorbing element 23, the spacer ring 24, and the second oil-absorbing element 25 are stacked sequentially to form a layered structure and are disposed inside the shell. The shell is filled with lubricating oil or grease. The first oil-absorbing element 23 and the second oil-absorbing element 25 can absorb and export the lubricating oil or grease for uniformly coating the surface of the screw shaft 30.

[0030] In combination Figures 1-2 As shown, the screw nut is connected with the screw shaft 30 through thread. One end of the screw nut 10 is provided with a fastening hole, and the fastener 40 is screwed through the outer shell of the lubricating assembly 20 and is connected with the fastening hole, so as to fix the lubricating assembly 20 on the screw nut 10.

[0031] In combination Figures 3-5 As shown, the outer shell is composed of the first shell 21 and the second shell 22, which are assembled by fitting to form a cavity containing the layered structure; the first shell 21 and / or the second shell 22 are provided with screw columns 21a, and the fastener 40 is connected and fixed with the screw nut 10 through the screw columns 21a, so as to ensure that the lubricating assembly 20 is stably installed on the screw nut 10.

[0032] Further, in the present embodiment, the first shell 21 and the second shell 22 are combined into a ring-shaped shell structure, which are fitted to form a ring-shaped cavity. The first oil absorption member 23 and the second oil absorption member 25 are both made of foam material, which has excellent adsorption capacity. The first oil absorption member 23, the spacer ring 24 and the second oil absorption member 25 are stacked in turn to form a “sandwich” layered structure, which ensures that the lubricating oil or grease can be effectively adsorbed, stored and discharged. The “sandwich” layered structure is embedded in the ring-shaped cavity, and through this structural design, the lubricating oil or grease can be uniformly and continuously coated on the surface of the screw shaft 30, providing stable lubrication effect.

[0033] In addition, a gap is provided between the screw column 21a and the cavity, which avoids the direct contact of the screw column 21a with the lubricating oil or grease, thereby reducing unnecessary friction and pollution. This design effectively improves the overall performance of the lubricating assembly 20, and ensures the efficiency and stability of the self-lubricating ball screw pair in long-time work.

[0034] Specifically, the first shell 21 and / or the second shell 22 are provided with positioning protrusions 21b, and the screw nut 10 is provided with positioning grooves 11 matched with the positioning protrusions 21b, so as to ensure that the lubricating assembly 20 can be accurately positioned during installation and prevent position deviation. The first oil absorption member 23 and the second oil absorption member 25 are respectively provided with through holes 23a through which the fastener 40 passes, so as to ensure that the fastener 40 can smoothly fix the lubricating assembly 20 and maintain the stability of the assembly. Meanwhile, the first oil absorption member 23 and the second oil absorption member 25 are also provided with coating portions 23b which are formed by radially extending inward from the inner rings of the first oil absorption member 23 and the second oil absorption member 25. The design of the coating portions 23b is such that they can extend out of the shell and contact the surface of the screw shaft 30, so as to realize the guiding and uniform coating of lubricating oil or lubricating grease, ensure that the surface of the screw shaft 30 always maintains a good lubrication state, reduce friction and wear, and improve the overall transmission efficiency. The fastener 40 includes a screw rod which is used to connect and fix the shell and the screw nut 10.

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A self-lubricating ball screw pair, characterized by: The lubricating assembly is fixed on one end of the screw nut by a fastener; the lubricating assembly is composed of a shell, a first oil absorbing member, a spacer ring and a second oil absorbing member, the first oil absorbing member, the spacer ring and the second oil absorbing member are stacked in sequence to form a layered structure and are arranged inside the shell; the inside of the shell is filled with lubricating oil or lubricating grease, the first oil absorbing member and the second oil absorbing member can absorb and discharge the lubricating oil or lubricating grease for uniform coating on the surface of the screw shaft.

2. The self-lubricating ball screw pair according to claim 1, wherein: The shell is composed of a first shell and a second shell, and the two are assembled together to form a cavity for accommodating the layered structure.

3. The self-lubricating ball-screw pair according to claim 2, wherein: The first shell and / or the second shell is provided with a screw post, and the fastener is connected and fixed with the screw nut through the screw post.

4. The self-lubricating ball-screw pair according to claim 3, wherein: The screw post is spaced apart from the cavity.

5. The self-lubricating ball-screw pair according to claim 2, wherein: The first shell and / or the second shell is provided with a positioning protrusion, and the screw nut is provided with a positioning groove matched with the positioning protrusion.

6. The self-lubricating ball-screw pair according to claim 1, wherein: The first oil absorbing member and / or the second oil absorbing member is provided with a through hole for the fastener to pass through.

7. The self-lubricating ball-screw pair according to claim 1, wherein: The first oil absorbing member and / or the second oil absorbing member is provided with a coating part, and the coating part extends out of the shell to contact the surface of the screw shaft.

8. The self-lubricating ball-screw pair according to claim 1, wherein: The fastener includes a screw rod for connecting and fixing the shell and the screw nut.

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