Zero backlash ball screw nut

Abstract

The utility model discloses zero gap screw rod nut, including first screw rod nut, one side of first screw rod nut is equipped with second screw rod nut, and one end of first screw rod nut is in contact with one end of second screw rod nut, and the one end of first screw rod nut away from second screw rod nut is fixedly connected with fixed angle block, and the surface of fixed angle block is equipped with a plurality of installation positioning hole, and the middle part of first screw rod nut is equipped with the middle support spring, and one side of middle support spring is connected with nut gasket, and the other side of first screw rod nut is equipped with nut gasket, and one side of nut gasket is in contact with one end of second screw rod nut, the utility model discloses zero gap screw rod nut, eliminates the gap of screw rod and nut cooperation, makes the processing more accurate, and first screw rod nut, second screw rod nut and fixed angle block all adopt the plastic and make, compared with metal nut, lubrication -free, maintenance -free, has saved the cost.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts, specifically to a zero-backlash lead screw nut. Background Technology

[0002] In mechanical transmission systems, the lead screw and nut pair is a commonly used mechanism for converting rotary motion into linear motion. However, traditional lead screw and nut pairs generally suffer from backlash issues. These backlashes primarily originate from thread machining errors in the lead screw and nut, assembly errors, and wear after long-term use. The presence of backlash leads to decreased transmission accuracy, causes idle strokes during reverse motion, affects the overall performance of the equipment and the quality of machining, and traditional metal nuts require regular lubrication and maintenance, increasing costs. Utility Model Content

[0003] The purpose of this invention is to provide a zero-backlash lead screw nut to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a zero-backlash lead screw nut, comprising a first lead screw nut, a second lead screw nut provided on one side of the first lead screw nut, and one end of the first lead screw nut contacting one end of the second lead screw nut, a fixing corner block fixedly connected to the end of the first lead screw nut away from the second lead screw nut, a plurality of mounting and positioning holes being formed on the surface of the fixing corner block, a central support spring sleeved in the middle of the first lead screw nut, a nut washer connected to one side of the central support spring, and the nut washer sleeved on the other side of the first lead screw nut, one side of the nut washer contacting one end of the second lead screw nut.

[0005] In a preferred embodiment of this invention, the diameter of the first lead screw nut matches the diameter of the second lead screw nut, and the inner diameter of the nut washer matches the outer diameter of the first lead screw nut.

[0006] As a preferred technical solution of this utility model, the first lead screw nut has a first threaded track inside, and the second lead screw nut has a second threaded track corresponding to the first threaded track inside. The first threaded track and the second threaded track facilitate the connection of the lead screw.

[0007] As a preferred technical solution of this utility model, the central support spring includes a raw material layer, an anti-corrosion layer and a scratch-resistant film. The outer side of the raw material layer is coated with an anti-corrosion layer, and the outer side of the anti-corrosion layer is fixedly connected with a scratch-resistant film. The raw material layer is made of stainless steel, and the anti-corrosion layer is made of polyurethane coating.

[0008] As a preferred embodiment of this utility model, the first lead screw nut, the second lead screw nut, and the fixing corner block all include a base material layer, a reinforcing layer, an anti-corrosion surface layer, and a lubricating layer. The outer side of the base material layer is coated with a reinforcing layer, the outer side of the reinforcing layer is coated with an anti-corrosion surface layer, and the inner side of the base material layer is coated with a lubricating layer.

[0009] As a preferred embodiment of this utility model, the substrate layer is made of polyethylene plastic, the reinforcing layer is made of ceramic coating, the anti-corrosion surface layer is made of epoxy resin, and the lubrication layer is made of lubricating oil film. The reinforcing layer and the anti-corrosion surface layer improve the surface's corrosion resistance and wear resistance.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The first lead screw nut is threaded onto the lead screw. A central support spring is fitted onto the first lead screw nut, and then a nut washer is fitted onto the first lead screw nut to compress the central support spring. The second lead screw nut is then threaded onto the lead screw. The rebound action of the central support spring creates elastic force on the fixed corner block and the nut washer, indirectly acting on the first and second lead screw nuts. This rebound ensures that both the first and second lead screw nuts fit snugly against the lead screw thread, eliminating any gap between the lead screw and the nut, resulting in more precise machining. Furthermore, the first and second lead screw nuts, as well as the fixed corner block, are all made of plastic, eliminating the need for lubrication and maintenance compared to metal nuts, thus saving costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 This is a structural diagram of the back of this utility model;

[0015] Figure 4 This is a structural diagram of the support spring in this utility model;

[0016] Figure 5 This is a structural diagram of the first lead screw nut of this utility model.

[0017] In the diagram: 1. First lead screw nut; 2. Second lead screw nut; 3. Nut washer; 4. Central support spring; 5. Fixing corner block; 6. First threaded path; 7. Second threaded path; 8. Mounting positioning hole; 9. Raw material layer; 10. Anti-corrosion layer; 11. Scratch-resistant film; 12. Substrate layer; 13. Reinforcing layer; 14. Anti-corrosion surface layer; 15. Lubricating layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5 This utility model provides a zero-backlash lead screw nut, including a first lead screw nut 1, a second lead screw nut 2 on one side of the first lead screw nut 1, and one end of the first lead screw nut 1 in contact with one end of the second lead screw nut 2. A fixing corner block 5 is fixedly connected to the end of the first lead screw nut 1 away from the second lead screw nut 2. A plurality of mounting positioning holes 8 are opened on the surface of the fixing corner block 5. A central support spring 4 is sleeved in the middle of the first lead screw nut 1. A nut washer 3 is connected to one side of the central support spring 4, and the nut washer 3 is sleeved on the other side of the first lead screw nut 1. One side of the nut washer 3 is in contact with one end of the second lead screw nut 2.

[0020] See Figure 1-5 The diameter of the first lead screw nut 1 matches the diameter of the second lead screw nut 2, the inner diameter of the nut washer 3 matches the outer diameter of the first lead screw nut 1, the first lead screw nut 1 has a first thread 6 inside, the second lead screw nut 2 has a second thread 7 corresponding to the first thread 6 inside, the central support spring 4 includes a raw material layer 9, an anti-corrosion layer 10 and a scratch-resistant film 11, the outer side of the raw material layer 9 is coated with the anti-corrosion layer 10, and the outer side of the anti-corrosion layer 10 is fixedly connected with the scratch-resistant film 11, the raw material layer 9 is made of stainless steel, and the anti-corrosion layer 10 is made of polyurethane coating;

[0021] In this embodiment, a nut washer 3 and a central support spring 4 are clamped between the first lead screw nut 1 and the second lead screw nut 2. The nut washer 3 presses the central support spring 4 tightly. Under the rebound action of the central support spring 4, an elastic force can be formed on the fixed corner block 5 and the nut washer 3, thereby indirectly acting on the first lead screw nut 1 and the second lead screw nut 2. In turn, the rebound can make the first lead screw nut 1 and the second lead screw nut 2 fit against the thread of the lead screw, eliminating the gap between the lead screw and the nut.

[0022] See Figure 1-5 The first lead screw nut 1, the second lead screw nut 2, and the fixed corner block 5 all include a base layer 12, a reinforcing layer 13, an anti-corrosion surface layer 14, and a lubricating layer 15. The outer side of the base layer 12 is coated with the reinforcing layer 13, the outer side of the reinforcing layer 13 is coated with the anti-corrosion surface layer 14, and the inner side of the base layer 12 is coated with the lubricating layer 15. The base layer 12 is made of polyethylene plastic, the reinforcing layer 13 is made of ceramic coating, the anti-corrosion surface layer 14 is made of epoxy resin, and the lubricating layer 15 is made of lubricating oil film.

[0023] In this embodiment, a lubricating layer 15 is provided on the inner side of the substrate layer 12 to improve the surface lubrication, and a reinforcing layer 13 and an anti-corrosion surface layer 14 are provided on the outer side to improve the surface's wear and corrosion resistance.

[0024] In practical use, the zero-backlash lead screw nut of this utility model is composed of a first lead screw nut 1 and a second lead screw nut 2. A nut washer 3 and a central support spring 4 are clamped between the first lead screw nut 1 and the second lead screw nut 2. During installation, the first lead screw nut 1 is threaded onto the lead screw. Then, the central support spring 4 is fitted onto the first lead screw nut 1. Next, the nut washer 3 is fitted onto the first lead screw nut 1, pressing the central support spring 4 tightly. Finally, the second lead screw nut 2 is threaded onto the lead screw, such that one end of the second lead screw nut 2 is flush with one side of the nut washer 3. With close contact, the nut washer 3 presses the central support spring 4 tightly. Under the rebound action of the central support spring 4, it can form an elastic force on the fixed corner block 5 and the nut washer 3, thereby indirectly acting on the first lead screw nut 1 and the second lead screw nut 2. In turn, through the rebound, the first lead screw nut 1 and the second lead screw nut 2 can be made to fit against the thread of the lead screw, eliminating the gap between the lead screw and the nut, making the machining more precise. Moreover, the first lead screw nut 1, the second lead screw nut 2 and the fixed corner block 5 are all made of plastic, which is lubricated and maintenance-free compared to metal nuts, saving costs.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A zero-backlash lead screw nut, comprising a first lead screw nut (1), characterized in that: A second screw nut (2) is provided on one side of the first screw nut (1), and one end of the first screw nut (1) is in contact with one end of the second screw nut (2). A fixing block (5) is fixedly connected to the end of the first screw nut (1) away from the second screw nut (2). A plurality of mounting positioning holes (8) are opened on the surface of the fixing block (5). A central support spring (4) is sleeved in the middle of the first screw nut (1). A nut washer (3) is connected to one side of the central support spring (4), and the nut washer (3) is sleeved on the other side of the first screw nut (1). One side of the nut washer (3) is in contact with one end of the second screw nut (2).

2. The zero-backlash lead screw nut according to claim 1, characterized in that: The diameter of the first lead screw nut (1) matches the diameter of the second lead screw nut (2), and the inner diameter of the nut washer (3) matches the outer diameter of the first lead screw nut (1).

3. The zero-backlash lead screw nut according to claim 1, characterized in that: The first lead screw nut (1) has a first threaded channel (6) inside, and the second lead screw nut (2) has a second threaded channel (7) corresponding to the first threaded channel (6) inside.

4. The zero-backlash lead screw nut according to claim 1, characterized in that: The central support spring (4) includes a raw material layer (9), an anti-corrosion layer (10), and a scratch-resistant film (11). The outer side of the raw material layer (9) is coated with the anti-corrosion layer (10), and the outer side of the anti-corrosion layer (10) is fixedly connected with the scratch-resistant film (11). The raw material layer (9) is made of stainless steel, and the anti-corrosion layer (10) is made of polyurethane coating.

5. The zero-backlash lead screw nut according to claim 1, characterized in that: The first lead screw nut (1), the second lead screw nut (2) and the fixed corner block (5) all include a base material layer (12), a reinforcing layer (13), an anti-corrosion surface layer (14) and a lubricating layer (15), and the outer side of the base material layer (12) is coated with the reinforcing layer (13), the outer side of the reinforcing layer (13) is coated with the anti-corrosion surface layer (14), and the inner side of the base material layer (12) is coated with the lubricating layer (15).

6. The zero-backlash lead screw nut according to claim 5, characterized in that: The substrate layer (12) is made of polyethylene plastic, the reinforcing layer (13) is made of ceramic coating, the anti-corrosion surface layer (14) is made of epoxy resin, and the lubrication layer (15) is made of lubricating oil film.

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