A screw structure cooperating with a worm wheel

Abstract

The utility model discloses a screw rod structure cooperated with worm wheel relates to transmission structure field. This screw rod structure cooperated with worm wheel, including thread section and end section, the thread section surface is seted up with thread groove, and end section sets up in the end of thread section, and the outer ring surface of end section is seted up with worm wheel presss and installs the surface, and worm wheel presss and installs the surface by round surface and straight line knurling surface composition. This screw rod structure cooperated with worm wheel, through the straight line knurling surface of end section adoption, significantly increased the loosening torque between worm wheel and end section, effectively prevented the loosening of worm wheel and end section in the transmission process, improved the security and stability of transmission chain, and the round surface of end section and presss and installs the section between chamfer processing, help to improve the coaxial degree of worm wheel and end section, further guarantee the stability and accuracy of transmission.

Description

Technical Field

[0001] This utility model relates to the field of transmission structure technology, specifically a lead screw structure that cooperates with a worm gear. Background Technology

[0002] In existing transmission chain structures, the design of the worm gear and lead screw connection is one of the key aspects. Typically, the power assist motor transmits power to the worm gear through the worm, and the worm gear then drives the lead screw to rotate, thereby transmitting the power to the output end.

[0003] However, the existing design of the mating surface between the worm gear and the lead screw has flaws, primarily employing a smooth shaft with an interference fit. This design may result in insufficient disengagement torque during transmission, leading to detachment of the worm gear and lead screw, breakage of the transmission chain, and potential safety accidents. Therefore, improving the mating design of the worm gear and lead screw to enhance the safety and stability of the transmission chain has become an urgent problem to be solved. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a lead screw structure that meshes with a worm gear. This solves the problem of unreasonable designs in the existing worm gear and lead screw mating surfaces, primarily employing a smooth rod with an interference fit. However, this design may result in insufficient loosening torque between the worm gear and lead screw during transmission, leading to detachment of the worm gear and lead screw, breakage of the transmission chain, and potential safety accidents.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lead screw structure that cooperates with a worm gear, comprising:

[0006] The threaded section has threaded grooves on its surface;

[0007] The end section is located at the end of the threaded section. The outer ring surface of the end section has a worm gear press-fit surface, which is composed of a smooth circular surface and a straight knurled surface.

[0008] When pressing a worm gear, the use of the knurled surface can increase the friction between the worm gear and the end section, thereby increasing the loosening torque.

[0009] Preferably, the end section includes a connecting section and a press-fit section, the connecting section is located between the threaded section and the press-fit section, and the worm gear press-fit surface is formed at the end of the press-fit section near the connecting section.

[0010] Preferably, the smooth circular surface and the pressing section are chamfered.

[0011] Preferably, the threaded section and the end section are manufactured as a single piece.

[0012] Preferably, when the smooth circular surface portion is press-fitted into the worm gear, the interference fit amount is 6-8 mils.

[0013] Preferably, the interference fit amount of the straight-knurled surface portion during worm gear press fitting is 10-15 mils.

[0014] This utility model discloses a lead screw structure that cooperates with a worm gear, which has the following beneficial effects:

[0015] 1. The lead screw structure that works with the worm gear significantly increases the loosening torque between the worm gear and the end section by using a straight-knurled surface at the end section. This effectively prevents the worm gear from loosening from the end section during transmission, thus improving the safety and stability of the transmission chain.

[0016] 2. The lead screw structure that cooperates with the worm gear has a chamfered end section between the smooth round surface and the press-fit section, which helps to improve the coaxiality between the worm gear and the end section, further ensuring the smoothness and accuracy of the transmission.

[0017] 3. The screw structure that mates with the worm gear has an interference fit of 6-8 microns on the smooth round surface part and 10-15 microns on the knurled surface part when pressing the worm gear. This ensures a tight fit between the worm gear and the end section while avoiding assembly difficulties or damage caused by excessive pressing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] In the diagram: 1. Threaded section; 2. End section; 21. Connecting section; 22. Press-fit section; 23. Worm gear press-fit surface; 231. Smooth circular surface; 232. Straight knurled surface. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This application provides a lead screw structure that mates with a worm gear, addressing the shortcomings of existing worm gear and lead screw mating surface designs, which primarily employ a smooth rod with interference fit. This design can lead to insufficient loosening torque between the worm gear and lead screw during transmission, causing the worm gear to detach from the lead screw, breaking the transmission chain, and potentially resulting in a safety accident. By using a knurled surface 232 on the end section 2, the loosening torque between the worm gear and end section 2 is significantly increased, effectively preventing detachment during transmission and improving the safety and stability of the transmission chain.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] This utility model discloses a lead screw structure that cooperates with a worm gear.

[0025] According to the appendix Figure 1 As shown, it includes:

[0026] Threaded section 1, its surface is provided with threaded grooves;

[0027] End section 2 is located at the end of thread section 1. The outer ring surface of end section 2 is provided with worm gear press-fit surface 23, which is composed of smooth circular surface 231 and straight knurled surface 232.

[0028] When pressing the worm gear, the mating method of the knurled surface 232 can increase the friction between the worm gear and the end section 2, thereby increasing the loosening torque.

[0029] By using the knurled surface 232 on the end section 2, the loosening torque between the worm gear and the end section 2 is significantly increased, effectively preventing the worm gear from loosening from the end section 2 during transmission and improving the safety and stability of the transmission chain.

[0030] Specifically disclosed, the end section 2 includes a connecting section 21 and a press-fit section 22. The connecting section 21 is located between the threaded section 1 and the press-fit section 22, and the worm gear press-fit surface 23 is opened at the end of the press-fit section 22 near the connecting section 21.

[0031] Furthermore, a chamfer is applied between the smooth circular surface 231 and the pressing section 22.

[0032] The chamfering treatment between the smooth circular surface 231 of the end section 2 and the pressing section 22 helps to improve the coaxiality between the worm gear and the end section 2, further ensuring the smoothness and accuracy of the transmission.

[0033] Furthermore, the threaded section 1 and the end section 2 are manufactured as a single piece.

[0034] Furthermore, when pressing the worm gear into the smooth circular surface 231, the interference fit is 6-8 microns.

[0035] Furthermore, when pressing the straight-knurled surface 232 into the worm gear, the interference fit is 10-15 mils.

[0036] When pressing the worm gear into the smooth circular surface 231 part, the interference fit is 6-8 microns. When pressing the worm gear into the straight knurled surface 232 part, the interference fit is 10-15 microns. This ensures a tight fit between the worm gear and the end section 2, while avoiding assembly difficulties or damage caused by excessive pressing.

[0037] By using the knurled surface 232 on the end section 2, the loosening torque between the worm gear and the end section 2 is significantly increased, effectively preventing the worm gear from loosening from the end section 2 during transmission and improving the safety and stability of the transmission chain.

[0038] The chamfering treatment between the smooth circular surface 231 of the end section 2 and the pressing section 22 helps to improve the coaxiality between the worm gear and the end section 2, further ensuring the smoothness and accuracy of the transmission.

[0039] When pressing the worm gear into the smooth circular surface 231 part, the interference fit is 6-8 microns. When pressing the worm gear into the straight knurled surface 232 part, the interference fit is 10-15 microns. This ensures a tight fit between the worm gear and the end section 2, while avoiding assembly difficulties or damage caused by excessive pressing.

[0040] Assembly process: During assembly, firstly, the worm gear is fitted with the smooth circular surface 231 of the front half of the worm gear press-fit surface 23, and fixed by interference fit, with a pressing amount of 6-8 microns. Then, the worm gear is further pushed towards the knurled surface 232 of the rear half of the worm gear press-fit surface 23, so that the knurled surface 232 of the rear half is in close contact with the bore wall of the worm gear, and further fixed by interference fit, with a pressing amount of 10-15 microns.

[0041] Transmission process: When the power assist motor transmits the power assist to the worm wheel through the worm, the worm wheel begins to rotate under the action of the power assist. Due to the design of the straight-knurled surface 232 of the rear half of the worm wheel press-fit surface 23, the release torque between the two is increased. Therefore, the worm wheel can stably drive the lead screw to rotate, transmitting the power assist to the output end.

[0042] Safety assurance: During the transmission process, the tight fit between the worm gear and the lead screw and the large loosening torque effectively prevent safety accidents caused by the breakage of the transmission chain, thus improving the safety and reliability of the entire transmission system.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lead screw structure that cooperates with a worm gear, characterized in that, include: The threaded section (1) has a threaded groove on its surface; The end section (2) is located at the end of the threaded section (1). The outer ring surface of the end section (2) is provided with a worm gear press-fit surface (23), and the worm gear press-fit surface (23) is composed of a smooth circular surface (231) and a straight knurled surface (232). When pressing the worm gear, the use of the knurled surface (232) can increase the friction between the worm gear and the end section (2), thereby increasing the loosening torque.

2. The lead screw structure cooperating with a worm gear according to claim 1, characterized in that, The end section (2) includes a connecting section (21) and a press-fit section (22). The connecting section (21) is located between the threaded section (1) and the press-fit section (22), and the worm gear press-fit surface (23) is opened at the end of the press-fit section (22) near the connecting section (21).

3. The lead screw structure cooperating with a worm gear according to claim 1, characterized in that, The smooth circular surface (231) and the pressing section (22) are chamfered.

4. The lead screw structure cooperating with a worm gear according to claim 1, characterized in that, The threaded section (1) and the end section (2) are manufactured as a single piece.

5. The lead screw structure for use with a worm gear according to claim 1, characterized in that, When the smooth circular surface (231) portion is press-fitted into the worm gear, the interference fit amount is 6-8 mils.

6. The lead screw structure for use with a worm gear according to claim 1, characterized in that, When the straight-knurled surface (232) is press-fitted into the worm gear, the interference fit amount is 10-15 mils.

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