Drive with self-locking function

Abstract

The present invention relates to the field of drivers, and in particular to a driver with a self-locking function, comprising a housing, a driving assembly arranged in the housing, and an output pushing assembly connected to the driving assembly, a screw connecting piece is arranged between the driving assembly and the output pushing assembly, a self-locking assembly is arranged on the screw connecting piece, and the self-locking assembly has a self-locking spring, and the end of the self-locking spring abuts against the screw connecting piece. The present invention has a better self-locking effect.

Description

Technical Field

[0001] The present invention relates to the technical field of drivers, and in particular to a driver with a self-locking function. Background Art

[0002] Linear actuators are devices used to output linear driving force.

[0003] In the prior art, the linear drive includes a driving component and an output rod connected to the output end of the driving component. The output rod provides linear power through the power of the driving component. When the driving component stops outputting power, in order to allow the driving rod to hover and not be reset by the driving force of the load, the prior art generally limits the position through a limit nut, and the thread between the push screw and the limit nut can achieve self-locking.

[0004] The disadvantage of the prior art is that, when the load is large, the self-locking force between the push screw and the limit nut is insufficient, which easily causes the push screw to rotate and retract. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a driver with a self-locking function having better self-locking force.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: a driver with a self-locking function, comprising a housing, a driving component arranged in the housing, and an output pushing component connected to the driving component, a screw connecting piece is arranged between the driving component and the output pushing component, a self-locking component is arranged on the screw connecting piece, and the end of the self-locking spring abuts against the screw connecting piece.

[0007] By adopting the above technical solution, the two ends of the self-locking spring are abutted against the screw connecting piece, and the driving component drives the output of the output pushing component through the screw connecting piece, so that the elastic force of the self-locking spring can provide a self-locking force.

[0008] In a preferred example, the present invention can be further configured as follows: a spring sleeve is fixedly connected to the housing, the spring sleeve is fixedly connected to the housing, and the inner wall of the self-locking spring abuts against the spring sleeve.

[0009] By adopting the above technical solution, the setting of the spring sleeve can provide a greater self-locking force. When the output push assembly has a tendency to reset, the end of the self-locking spring is compressed, thereby reducing the inner diameter of the self-locking spring and tightening it on the spring sleeve. The greater the force, the greater the tightening force, thereby achieving a greater self-locking force.

[0010] In a preferred example, the present invention can be further configured as follows: the output pushing assembly includes a pushing screw and a limit nut threadedly connected to the pushing screw, the limit nut is slidably connected in the casing, and the screw is fixedly connected to the screw connector.

[0011] By adopting the above technical solution, after the driving assembly and the screw connector drive the screw to rotate, the setting of the limit nut can enable the screw to drive the limit nut to perform linear motion, thereby providing a linear output force. The limit nut cooperates with the thread of the pushing screw to give the pushing screw a self-locking force, providing the first step of self-locking. When the self-locking force of the thread is insufficient, further self-locking is achieved by tightening the self-locking spring on the spring sleeve.

[0012] In a preferred example, the present invention can be further configured as follows: the starting component includes a driving motor fixed to the casing, the output end of the driving motor is fixedly connected to a driving screw, the driving screw is meshed with a driving gear, and the driving gear is connected to the screw connector.

[0013] By adopting the above technical solution, the driving motor drives the driving screw to rotate, which in turn drives the driving gear to rotate. The screw connector is started by the driving gear to achieve circular motion of the screw and linear motion of the limit nut.

[0014] In a preferred example, the present invention can be further configured as follows: the screw connector includes an arc-shaped driving plate fixedly connected to the inner wall of the driving gear, and an arc-shaped linkage plate rotatably connected to the inner wall of the driving gear, the arc-shaped driving plate and the arc-shaped linkage plate have the same curvature and the centers of the circles coincide, and the two ends of the self-locking spring are respectively a self-locking end and a free end.

[0015] By adopting the above technical scheme, when the driving gear rotates, it drives the arc driving plate to rotate, and the arc driving plate pushes the self-locking end of the self-locking spring to increase the diameter of the self-locking spring, thereby separating the self-locking spring from the spring sleeve, and the arc driving plate continues to move to push the arc linkage plate, and the arc linkage plate drives the lead screw to rotate, thereby enabling the limit nut to be pushed out linearly. When the driving gear stops rotating, the lead screw is pushed to self-lock the limit nut. When the self-locking force of the limit nut is insufficient, the lead screw is pushed to rotate, and the self-locking end of the self-locking spring is pushed in the opposite direction by the arc linkage plate and the inner diameter of the self-locking spring is reduced, and the self-locking spring is tightened on the spring sleeve. The greater the push of the arc linkage plate, the greater the tightening force between the self-locking spring and the spring sleeve, and the greater the self-locking force.

[0016] In a preferred example, the present invention can be further configured as follows: two arc-shaped driving plates are provided, and a travel gap is provided between the two arc-shaped driving plates, and the arc-shaped linkage plate is located in the travel gap.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects:

[0018] In the non-working state, the load applies thrust to the pushing screw, driving the pushing screw to rotate. At this time, the arc-shaped linkage plate abuts against the self-locking end of the self-locking spring. The self-locking spring has a tendency to reduce its diameter and lock. The self-locking spring is tightened on the spring sleeve, so that the pushing screw cannot rotate. A larger self-locking force is achieved through the self-locking spring. When the drive motor is started, the arc-shaped drive plate pushes the self-locking end of the self-locking spring. Due to the movement of the motor, the self-locking spring has a certain acceleration. At the same time, there is friction between the self-locking spring and the spring sleeve, so the self-locking spring will not rotate around the spring sleeve, and the inner diameter of the self-locking spring increases. And it is separated from the spring sleeve, the arc driving plate continues to rotate and pushes the arc linkage plate to rotate after passing through the stroke gap, the arc linkage plate and the pushing screw rotate synchronously, and under the drive of the limit nut, the output tube outputs a driving force forward, when the motor stops outputting, the self-locking spring contracts and tightens on the spring sleeve, when the self-locking force between the pushing screw and the limit nut is insufficient, the pushing screw continues to rotate, driving the self-locking end of the self-locking spring to rotate, thereby making the diameter of the self-locking spring smaller and smaller, and the tightening force on the spring sleeve larger and larger, thereby being able to provide a greater self-locking force, thereby realizing the self-locking of the pushing screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the housing of Example 1;

[0020] Figure 2 is a schematic diagram of the internal structure in Example 1;

[0021] Figure 3 It is a schematic diagram of the connection structure of the self-locking component;

[0022] Figure 4 yes Figure 3 Enlarged view of part A in .

[0023] Figure numerals: 1, housing; 2, driving assembly; 20, driving motor; 21, driving gear; 22, driving screw; 23, screw connector; 230, arc-shaped driving plate; 231, arc-shaped linkage plate; 233, bearing; 3, output pushing assembly; 30, output pipe; 31, limiting nut; 32, pushing screw; 33, sliding block; 4, self-locking assembly; 40, spring sleeve; 41, self-locking spring; 410, self-locking end; 411, free end. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0025] Example 1, reference Figure 1 , Figure 2 , Figure 3A driver with a self-locking function includes a casing 1, an output push component 3 is arranged inside the casing 1, and is used to output a driving force outward. The output push component 3 is connected to a driving component 2 that provides power for the output push component 3. The output push component 3 is pushed outward by the driving component 2. A self-locking component 4 is also arranged on the driving component 2 and the output push component 3. When the output push component 3 is pushed outward, the load is pressed on the output push component 3, and the self-locking component 4 can prevent the output push component 3 from being pushed back.

[0026] The output pushing component 3 includes an output tube 30 slidably connected to the inside of the casing 1, the output tube 30 is fixedly connected to a limiting nut 31, the limiting nut 31 is threadedly connected to a pushing screw 32, the outer wall of the limiting nut 31 is threadedly connected to the outer casing, the driving component 2 controls the rotation of the pushing screw 32, and sliding blocks 33 for limiting the rotation of the limiting nut 31 are arranged on both sides of the limiting nut 31, and a sliding groove for sliding the sliding block 33 is arranged in the casing 1, and the limiting nut 31 is allowed to slide axially by rotating the pushing screw 32. The output tube 30 is sleeved on the pushing screw and fixed to the limiting nut 31, so the output tube 30 extends out by linear motion.

[0027] The driving assembly 2 includes a driving motor 20 fixed inside the casing 1, the output shaft of the driving motor 20 is fixedly connected to a driving screw 22, the driving screw 22 is meshed with a driving gear 21, the driving gear 21 is fixedly connected to a screw connector 23, the screw connector 23 is connected to a pushing screw 32, after starting the driving motor 20, the pushing screw 32 is driven to rotate through the screw connector 23, and then the limiting nut 31 drives the output tube 30 to be pushed outward.

[0028] Reference Figure 4 The screw connecting member 23 includes an arc-shaped driving plate 230 fixed on the gear and a bearing 233 rotatably connected to the inner wall of the driving gear 21. The outer ring of the bearing 233 is fixed on the inner wall of the driving gear 21, and the inner ring of the bearing 233 is fixed on the pushing screw 32. The inner ring of the bearing 233 is fixedly connected with an arc-shaped linkage plate 231. The arc-shaped linkage plate 231 has the same curvature as the arc-shaped driving plate 230. The rotation of the driving gear 21 drives the arc-shaped linkage plate 231 to rotate and then drives the pushing screw 32 to rotate. The arc-shaped driving plate 230 is provided with two opposite pieces, and a travel gap is provided between the two opposite arc-shaped driving plates 230. The arc-shaped driving plate 230 is located in the travel gap, and the curvature of the travel gap is smaller than the curvature of the arc-shaped driving plate 230.

[0029] After the driving motor 20 is started, the gear drives the arc-shaped driving plate 230 , and after a travel gap, drives the arc-shaped linkage plate 231 to rotate, and then drives the driving screw 32 to rotate.

[0030] The self-locking assembly 4 includes a spring sleeve 40 fixed inside the housing 1, the spring sleeve 40 is sleeved on the push screw 32, and a self-locking spring 41 is sleeved on the outer wall of the spring sleeve 40, the axis of which is colinear with the axis of the spring sleeve 40. The two ends of the self-locking spring 41 are respectively a self-locking end 410 and a free end 411, the self-locking end 410 extends outward along the cross-sectional diameter of the self-locking spring 41 and abuts against the arc-shaped driving plate 230, and the free end 411 of the self-locking spring 41 extends outward along the cross-sectional diameter of the self-locking spring 41 and has a large friction force with the spring sleeve 40.

[0031] During the rotation of the arc driving plate 230, the self-locking end 410 of the self-locking spring 41 is first driven to push outward. At this time, the pushing screw 32 has not rotated yet, or the rotation speed is lower than the rotation speed of the arc driving plate 230. The cross-sectional diameter of the self-locking spring 41 becomes larger, and there is no locking force between the self-locking spring 41 and the spring sleeve 40. After the arc driving plate 230 continues to rotate, the arc driving plate 230 contacts the arc linkage plate 231 after passing through the stroke gap, thereby driving the screw to rotate. When the driving motor 20 stops After stopping rotation, the arc driving plate 230 stops transmission, and the push screw 32 has a restoring force for reverse rotation. The arc linkage plate 231 drives the self-locking end 410 of the self-locking spring 41 to rotate in the opposite direction. At this time, the diameter of the cross-section of the self-locking spring 41 becomes smaller. When the arc linkage plate 231 continues to apply force to the spring, the self-locking force between the inner wall of the self-locking spring 41 and the spring sleeve 40 is greater, until the arc linkage plate 231 can no longer push the self-locking spring 41, thereby providing a greater self-locking force for the self-locking of the push screw 32.

[0032] In the prior art, the self-locking of the pushing screw 32 completely relies on the self-locking of the thread between the limit nut 31 and the pushing screw 32. When the load is large, its self-locking force is insufficient. This embodiment increases the self-locking force of the pushing screw 32 through the elastic force at both ends of the self-locking spring 41 and the self-locking spring 41 is tightened on the spring sleeve 40, thereby having a better self-locking effect.

[0033] The specific implementation process is that in the non-working state, the load applies a thrust to the pushing screw rod 32, driving the pushing screw rod 32 to rotate. At this time, the arc-shaped linkage plate 231 abuts against the self-locking end 410 of the self-locking spring 41. The self-locking spring 41 has a tendency to reduce its diameter and lock. The self-locking spring 41 is tightened on the spring sleeve 40, so that the pushing screw rod 32 cannot rotate. A large self-locking force is achieved through the self-locking spring 41. When the driving motor 20 is started, the arc-shaped driving plate 230 pushes the self-locking end 410 of the self-locking spring 41. Due to the movement of the motor, the self-locking spring 41 has a certain acceleration. At the same time, there is friction between the self-locking spring 41 and the spring sleeve 40, so the self-locking spring 41 will not rotate around the spring sleeve 40. The inner diameter of the spring 41 increases and separates from the spring sleeve 40. The arc driving plate 230 continues to rotate and pushes the arc linkage plate 231 to rotate after passing through the travel gap. The arc linkage plate 231 rotates synchronously with the pushing screw 32. Driven by the limit nut 31, the output tube 30 outputs a driving force forward. When the motor stops outputting, the self-locking spring 41 contracts and is tightened on the spring sleeve 40. When the self-locking force between the pushing screw 32 and the limit nut 31 is insufficient, the pushing screw 32 continues to rotate, driving the self-locking end 410 of the self-locking spring 41 to rotate, thereby making the diameter of the self-locking spring 41 smaller and smaller, and the tightening force on the spring sleeve 40 larger and larger, thereby being able to provide a greater self-locking force, thereby realizing the self-locking of the pushing screw 32.

[0034] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A driver with a self-locking function, comprising a housing (1), a driving assembly (2) arranged in the housing (1), and an output driving assembly (3) connected to the driving assembly (2), characterized in that: A screw rod connector (23) is provided between the driving assembly (2) and the output pushing assembly (3); a self-locking assembly (4) is provided on the screw rod connector (23); the self-locking assembly (4) comprises a self-locking spring (41); the end of the self-locking spring (41) abuts against the screw rod connector (23); the screw rod connector (23) comprises an arc-shaped driving plate (230) fixedly connected to the inner wall of the driving gear (21); and an arc-shaped linkage plate (231) rotatably connected to the inner wall of the driving gear (21); the arc-shaped driving plate (230) and the arc-shaped linkage plate (231) have the same curvature and the centers of the circles coincide; a spring sleeve (40) is fixedly connected to the housing (1); the spring sleeve (40) is fixedly connected to the housing (1); The self-locking spring (41) is fixedly connected to the housing (1), the inner wall of the self-locking spring (41) is in contact with the spring sleeve (40), the two ends of the self-locking spring (41) are respectively a self-locking end (410) and a free end (411), the self-locking end (410) extends outward along the cross-sectional diameter of the self-locking spring (41) and is in contact with the arc-shaped driving plate (230), the free end (411) of the self-locking spring (41) extends outward along the cross-sectional diameter of the self-locking spring (41) and has friction with the spring sleeve (40), and the self-locking spring will not rotate around the spring sleeve; the arc-shaped driving plates (230) are provided with two, and a travel gap is provided between the two arc-shaped driving plates (230), and the arc-shaped linkage plate (231) is located in the travel gap.

2. The driver with self-locking function according to claim 1, characterized in that: The output push assembly (3) comprises a push screw (32) and a limit nut (31) threadedly connected to the push screw (32); the limit nut (31) is slidably connected in the housing (1); and the push screw (32) is fixedly connected to the screw connecting piece (23).

3. The driver with self-locking function according to claim 2, characterized in that: The driving assembly (2) comprises a driving motor (20) fixed on the housing (1); the output end of the driving motor (20) is fixedly connected to a driving screw (22); the driving screw (22) is meshed with a driving gear (21); and the driving gear (21) is connected to a screw connecting piece (23).

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