A reverser and a ball screw with a reverser

Abstract

The application relates to a reverser and a ball screw nut with the reverser, relates to the field of the reverser, and comprises a reverser body which is formed with a ball circulation channel for the circulation of balls, and is used for realizing the circulation of the balls between ball screw tracks; a positioning wing is integrally arranged on the reverser body, and the positioning wing is used for limiting the installation height of the reverser and realizing the axial and radial limiting of the reverser. The application has the effect of improving transmission precision.

Description

Technical Field

[0001] This invention relates to the field of reversing devices, and more particularly to a reversing device and a lead screw nut with a reversing device. Background Technology

[0002] The reversing device is a core functional component in a ball screw drive system. It is mainly responsible for guiding the balls to complete the cyclic reversal between the screw raceway and the nut raceway, so that the balls can continuously participate in the transmission.

[0003] Currently, the mainstream method for fixing reversers in the industry mostly uses separate fasteners for auxiliary fixing. The reverser body does not integrate a dedicated positioning structure. During installation, the reverser is first placed into the mounting groove of the nut body, its position is manually adjusted, and then the reverser is finally fixed by the matching fasteners.

[0004] The aforementioned fixing method cannot accurately control the installation height of the reverser, making it difficult to guarantee the coaxiality of the ball circulation channel and the internal raceway of the nut body. Furthermore, the installation process is too cumbersome, thus reducing installation efficiency, and needs to be improved. Summary of the Invention

[0005] To improve installation efficiency, the present invention provides a reversing device and a lead screw nut with a reversing device.

[0006] In a first aspect, the present invention provides an inverter that adopts the following technical solution: A reversing device includes a reversing device body, the reversing device body forming a ball circulation channel for ball passage, used to realize the cyclic reversal of the balls between the lead screw raceway; The reverser body is integrally provided with a positioning wing that cooperates with and is fixed to the lead screw nut. The positioning wing is used to limit the installation height of the reverser and realize the axial and radial limiting of the reverser.

[0007] By adopting the above technical solution and setting the positioning wing on the reversing device body as an integral part, the installation height of the reversing device can be precisely controlled and the axial and radial limits can be reliably limited without the need for additional separate fasteners. This simplifies the installation process and improves installation efficiency.

[0008] Optionally, the lower end face of the positioning wing is a plane, used to form a surface contact fit to achieve precise height positioning.

[0009] By adopting the above technical solution, and by setting the lower end face of the positioning wing to be a plane, a surface contact fit is formed, which increases the contact area, makes the positioning more stable and reliable, and further improves the control accuracy of the reverser installation height.

[0010] Optionally, the ball circulation channel includes a ball inlet section, an arc-shaped reversing section, and a ball outlet section connected in sequence. The ball inlet section and the ball outlet section are respectively connected to the lead screw raceway. The arc-shaped reversing section connects the ball inlet section and the ball outlet section to form a closed loop.

[0011] By adopting the above technical solution and setting a three-section ball circulation channel, the balls can complete the circulation and reversal along a continuous and smooth trajectory, ensuring the continuity and stability of the ball circulation.

[0012] Optionally, both the ball inlet section and the ball outlet section are provided with guide chamfers at their ends to guide the balls smoothly in and out of the ball circulation channel.

[0013] By adopting the above technical solution, the chamfered guides at the ends of the ball inlet and outlet sections can guide the balls smoothly into and out of the ball circulation channel, reducing wear on the balls and the channel.

[0014] Optionally, a reinforced fillet is provided at the connection between the positioning wing and the reverser body. The reinforced fillet is used to eliminate stress concentration at the connection and improve the fatigue strength of the positioning wing.

[0015] By adopting the above technical solution and strengthening the fillet at the connection between the positioning wing and the reverser body, stress concentration at the connection point is effectively eliminated, the fatigue strength of the positioning wing is improved, and the service life of the reverser is extended.

[0016] Optionally, the two sides of the ball circulation channel are provided with inwardly bent ball retaining edges, which are used to restrict the balls from laterally dislodging from the ball circulation channel.

[0017] By adopting the above technical solution and setting ball retaining edges on both sides of the ball circulation channel, the balls can be effectively prevented from coming out of the channel from the side, thus improving the safety and reliability of the ball circulation process.

[0018] Secondly, the present invention provides a lead screw nut, which adopts the following technical solution: A lead screw nut includes a reversing device as described in the first aspect, and a nut body. The nut body has a mounting groove adapted to the reversing device body, and the bottom of the mounting groove has a positioning step adapted to the positioning wing. The reversing device body is installed in the mounting groove, and the positioning wing is completely fitted with the positioning step.

[0019] By adopting the above technical solution, the mounting groove and positioning step on the nut body are designed to precisely match the positioning wing of the reverser, thereby further ensuring the installation position accuracy of the reverser and achieving reliable fixation of the reverser.

[0020] Optionally, the inner wall of the mounting groove is fitted with the outer wall of the reversing device body to form a circumferential limiting fit to restrict the circumferential rotation of the reversing device.

[0021] By adopting the above technical solution, and by setting the inner sidewall of the mounting groove to fit against the outer sidewall of the reversing device body, a circumferential limiting fit is formed, which effectively restricts the circumferential rotation of the reversing device and further improves the stability of the reversing device fixation.

[0022] Optionally, the top surface of the positioning step is a horizontal plane, and its height matches the designed installation height of the ball circulation channel to ensure the coaxiality of the ball circulation channel and the internal raceway of the nut body.

[0023] By adopting the above technical solution, and by setting the top surface of the positioning step to be horizontal and its height to match the designed installation height, the coaxiality of the ball circulation channel and the internal raceway of the nut body can be accurately guaranteed, reducing ball wear and further improving transmission accuracy.

[0024] Optionally, after the reverser body is installed in place, both ends of the ball circulation channel are smoothly connected to the internal raceway of the nut body to form a continuous ball circulation loop.

[0025] By adopting the above technical solution, a continuous ball circulation loop is formed through the smooth connection between the ball circulation channel and the internal raceway of the nut body, enabling the balls to circulate smoothly between the screw and the nut, thereby improving the stability and efficiency of the transmission.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: 1. By integrating the positioning wing on the main body of the inverter, precise control of the inverter's installation height and reliable axial and radial limits can be achieved simultaneously without the need for additional separate fasteners, simplifying the installation process and improving installation efficiency. 2. By setting the lower end face of the positioning wing to be a plane, a surface contact fit is formed, which increases the contact area, making the positioning more stable and reliable, and further improving the control accuracy of the reverser installation height; 3. By setting the mounting groove and positioning step on the nut body, a precise fit is formed with the positioning wing of the reverser, further ensuring the installation position accuracy of the reverser and realizing the reliable fixation of the reverser. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of a reversing device and a lead screw nut with a reversing device in Embodiment 1; Figure 2 This is a schematic diagram of the inverter body in Example 1; Figure 3 This is an overall schematic diagram of a reversing device and a lead screw nut with a reversing device in Embodiment 2; Figure 4 This is a schematic diagram of the integrated inverter in Example 2.

[0028] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Reversing device body; 2. Ball circulation channel; 21. Ball inlet section; 22. Arc-shaped reversing section; 23. Ball outlet section; 24. Ball retainer; 3. Positioning wing; 31. Reinforced fillet; 4. Nut body; 41. Mounting groove; 42. Positioning step; 5. Connecting piece; 51. New positioning wing; 6. Integrated reversing device; 7. Integral mounting groove. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] An embodiment of the present invention discloses an inverter. Example

[0031] Reference Figure 1 and Figure 2 A reversing device includes two independent reversing device bodies 1. Each reversing device body 1 is a rigid component that is integrally formed. The overall structure is a block structure that fits the mounting groove 41 of the lead screw nut. It has high structural strength and is not easily deformed. Each reversing device body 1 has a ball circulation channel 2 inside for the ball to pass through, which is used to realize the circulation and reversal of the ball between the lead screw raceway.

[0032] Each ball recirculation channel 2 includes a ball inlet section 21, an arc-shaped reversing section 22, and a ball outlet section 23 connected in sequence. The ball inlet section 21 and the ball outlet section 23 are respectively arranged facing the screw raceway and are used to connect with the screw raceway. The arc-shaped reversing section 22 has a smooth arc-shaped structure and connects the ball inlet section 21 and the ball outlet section 23 to form a closed ball recirculation loop.

[0033] Both the ball inlet section 21 and the ball outlet section 23 are provided with guide chamfers at their ends. The chamfers are smoothly transitioned to guide the balls to smoothly enter and exit the ball circulation channel 2 and prevent the balls from getting stuck. The two sides of the ball circulation channel 2 are provided with inwardly bent ball retainers 24. The ball retainers 24 are integrally formed with the reverser body 1 and extend along the length of the channel to restrict the balls from coming out laterally from the ball circulation channel 2.

[0034] Each inverter body 1 has two independent positioning wings 3 integrally formed on both side walls. The two positioning wings 3 are located on both sides of the body and are symmetrically distributed. The lower end surface of each positioning wing 3 is flat, which is used to form a surface contact fit to achieve precise height positioning of the corresponding inverter body 1. Each positioning wing 3 is provided with a reinforcing fillet 31 at the connection with the inverter body 1. The reinforcing fillet 31 has a natural transition and is used to eliminate stress concentration at the connection and improve the fatigue strength of the positioning wing 3. The two independent inverters have a total of four independent positioning wings 3, which are symmetrical in structure and balanced in positioning.

[0035] This embodiment also discloses a lead screw nut, including a nut body 4 and the two independent reverser bodies 1 mentioned above; the nut body 4 is a hollow cylindrical structure with an internal raceway formed on the inner wall to cooperate with the lead screw; the nut body 4 has two independent mounting grooves 41, which are adapted to the shape of the two reverser bodies 1 respectively; the bottom of each mounting groove 41 is provided with two sets of independent positioning steps 42, which are adapted to the two positioning wings 3 of the corresponding reverser body 1 respectively; the top surface of the positioning step 42 is a horizontal plane, and its height matches the designed installation height of the ball circulation channel 2, ensuring the coaxiality of the ball circulation channel 2 and the internal raceway of the nut body 4.

[0036] Two reverser bodies 1 are respectively embedded in the corresponding mounting slots 41. The inner sidewall of each mounting slot 41 is in contact with the outer sidewall of the corresponding reverser body 1 to form a circumferential limiting fit, which restricts the circumferential rotation of the reverser. After the reverser body 1 is installed in place, the two positioning wings 3 on both sides of the body are completely in contact with the corresponding positioning steps 42. The two ends of each ball circulation channel 2 are smoothly connected with the internal raceway of the nut body 4 to form a continuous ball circulation loop. Example

[0037] Reference Figure 3 and Figure 4 Compared with Example 1, the core difference of the reverser in Example 2 is that the two reverser bodies 1 are integrated into one piece, the two positioning wings 3 on the adjacent sides are integrated into the connecting piece 5, and the whole retains four positioning wings 3. The other related structures of the ball circulation channel 2 are the same as those in Example 1, and will not be described again here.

[0038] The inverter comprises two inverter bodies 1, which are integrally formed by the connecting piece 5 in the middle, forming an integral inverter 6 with a single integrated structure, which has stronger overall rigidity and higher installation consistency. Each of the two inverter bodies 1 retains one positioning wing 3 on the outer side, and the original two positioning wings 3 on the adjacent inner sides are no longer set separately, but instead two new positioning wings 51 are integrally formed on the connecting piece 5 in the middle.

[0039] Two new positioning wings 51 on the connecting piece 5 are arranged at intervals along the length of the connecting piece 5, and their positions correspond to the functional areas of the inner positioning wings 3 of the two reversers in Embodiment 1. Together with the positioning wings 3 retained on the outer sides of the two reverser bodies 1, the whole still maintains four positioning wings 3, and the positioning layout is balanced. The lower end surfaces of all positioning wings 3 are flat, which are used to form surface contact fit to achieve precise height positioning of the entire reverser. Each positioning wing 3 is provided with a reinforcing fillet 31 at the connection between it and the corresponding base, which is used to eliminate stress concentration at the connection and improve the fatigue strength of the positioning wing 3.

[0040] In this embodiment, the lead screw nut has an integral mounting groove 7 on its body 4 to fit the overall shape of the integrated reverser 6. The bottom of the integral mounting groove 7 is also provided with a positioning step 42, which includes two sets of independent outer steps and one set of continuous middle steps, respectively adapted to the four positioning wings 3 of the integrated reverser 6. The integrated reverser 6 is embedded in the integral mounting groove 7, and the four positioning wings 3 are completely fitted with the corresponding positioning steps 42. The inner sidewall of the integral mounting groove 7 is fitted with the outer sidewall of the integrated reverser 6 to form a circumferential limiting fit, which restricts the circumferential rotation of the integrated reverser 6. After the integrated reverser 6 is installed in place, the two ends of the two ball circulation channels 2 are smoothly connected with the internal raceways of the nut body 4 to form a continuous ball circulation loop.

[0041] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An inverter, characterized in that: Includes a reverser body (1), which forms a ball circulation channel (2) for the ball to pass through, for realizing the circulation and reversal of the ball between the lead screw raceway; The reverser body (1) is integrally provided with a positioning wing (3) that is fixed in conjunction with the lead screw nut. The positioning wing (3) is used to limit the installation height of the reverser and to achieve axial and radial positioning of the reverser.

2. The inverter according to claim 1, characterized in that: The lower end face of the positioning wing (3) is a plane, which is used to form a surface contact fit to achieve precise height positioning.

3. The inverter according to claim 1, characterized in that: The ball circulation channel (2) includes a ball inlet section (21), an arc-shaped reversing section (22), and a ball outlet section (23) connected in sequence. The ball inlet section (21) and the ball outlet section (23) are respectively connected to the lead screw raceway. The arc-shaped reversing section (22) connects the ball inlet section (21) and the ball outlet section (23) to form a closed loop.

4. An inverter according to claim 3, characterized in that: Both the ball inlet section (21) and the ball outlet section (23) are provided with guide chamfers at their ends to guide the balls to smoothly enter and exit the ball circulation channel (2).

5. An inverter according to claim 1, characterized in that: The connection between the positioning wing (3) and the reverser body (1) is provided with a reinforcing fillet (31). The reinforcing fillet (31) is used to eliminate stress concentration at the connection and improve the fatigue strength of the positioning wing (3).

6. An inverter according to claim 1, characterized in that: The two sides of the ball circulation channel (2) are provided with inwardly bent ball guards (24), which are used to restrict the balls from coming out of the ball circulation channel (2) laterally.

7. A lead screw nut, comprising a reversing device as claimed in any one of claims 1 to 6, characterized in that: It also includes a nut body (4), on which a mounting groove (41) adapted to the reverser body (1) is provided, and a positioning step (42) adapted to the positioning wing (3) is provided at the bottom of the mounting groove (41); the reverser body (1) is installed in the mounting groove (41), and the positioning wing (3) is completely fitted with the positioning step (42).

8. A lead screw nut according to claim 7, characterized in that: The inner wall of the mounting groove (41) fits against the outer wall of the reverser body (1) to form a circumferential limiting fit to restrict the circumferential rotation of the reverser.

9. A lead screw nut according to claim 7, characterized in that: The top surface of the positioning step (42) is a horizontal plane, and its height matches the design installation height of the ball circulation channel (2) to ensure the coaxiality of the ball circulation channel (2) and the internal raceway of the nut body (4).

10. A lead screw nut according to claim 7, characterized in that: After the reverser body (1) is installed in place, the two ends of the ball circulation channel (2) are smoothly connected to the internal raceway of the nut body (4) to form a continuous ball circulation loop.

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