Electric actuating mechanism capable of eliminating gap

Abstract

The utility model relates to the field of automobile seats, in particular to an electric actuating mechanism for eliminating a clearance, which comprises an electric actuating element, a clearance eliminating component and a driving gear, the clearance eliminating component comprises a brake ring, an unlocking ring, a brake roller, a brake spring and a shaft core, and the output end of the electric actuating element is fixedly connected with the center of the unlocking ring through the shaft core. A driving finger-shaped object is arranged on the side, facing the brake ring, of the unlocking ring, a driving part is fixedly arranged on the side, facing the brake ring, of the driving gear, the brake ring is provided with a limiting circular ring face, a driving groove is formed in the circumferential face of the driving part, and the brake roller is limited between the driving groove and the limiting circular ring face and arranged between the driving finger-shaped object and the brake spring. The driving gear of the electric actuating mechanism has no sensitive clearance during rotation, the sensory quality of a terminal customer is good, and the clearance eliminating assembly and the electric driving element are two independent modules, so that different electric driving elements are adapted according to application requirements of different scenes.

Description

Technical Field

[0001] This utility model relates to the field of automotive seats, and in particular to an electric actuator for automotive seats. Background Technology

[0002] Currently, electric seat actuators used in automobiles, such as electric height adjusters, require several gears to complete the adjustment function. Because of the inherent backlash between these gears, multiple gear sets amplify this backlash, leading to wobbling during adjustment. Therefore, existing automotive electric actuators, due to the sensitive backlash in the output gear rotation, result in unsatisfactory sensory quality for end users in specific applications. Furthermore, these electric actuators are relatively expensive. Regarding manual height adjusters, while the Chinese patent document CN102529758A features self-locking and backlash elimination, it is only applicable to manual adjustment scenarios.

[0003] The technical problem to be solved by this application is: how to design an electric actuator mechanism that can eliminate transmission backlash. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide an electric actuator that eliminates backlash.

[0005] The technical solution adopted by this utility model is as follows: an electric actuator for eliminating backlash, comprising an electric actuator element, a backlash elimination assembly, and a drive gear. The backlash elimination assembly includes a brake ring, an unlocking ring, a brake roller, a brake spring, and a shaft. The output end of the electric actuator element is fixedly connected to the center of the unlocking ring through the shaft. The unlocking ring has a drive finger on the side facing the brake ring. The drive gear has a drive part fixedly on the side facing the brake ring. The brake ring has a limiting annular surface. The circumferential surface of the drive part has a drive groove. The brake roller is restricted between the drive groove and the limiting annular surface. The brake roller is disposed between the drive finger and the brake spring.

[0006] In some embodiments, the two ends of the brake spring are connected to corresponding brake rollers, and the brake rollers and brake springs are arranged between adjacent drive fingers.

[0007] In some embodiments, the drive slots are wedge-shaped, and the brake springs are disposed between adjacent drive slots.

[0008] In some embodiments, the drive fingers and the brake spring are respectively disposed in the drive groove.

[0009] In some implementations, the end of the shaft that connects to the electric actuator is not cylindrical, and the shaft is connected to the output end of the electric actuator by a screw or a self-locking spring.

[0010] In some embodiments, a stepped sleeve is fixedly provided around the circumference of the shaft core, and the stepped sleeve is disposed between the electric actuator and the backlash elimination element.

[0011] In some implementations, the two ends of the brake spring are connected to corresponding brake rollers.

[0012] In some embodiments, the gap elimination assembly includes a support cover, which includes a support plate and a housing that are assembled and cannot rotate relative to each other, and a brake ring, an unlocking ring, a brake roller and a brake spring are disposed between the support plate and the housing.

[0013] In some embodiments, the circumference of the housing is provided with multiple fixing protrusions and limiting grooves, the bracket plate is provided with fixing grooves corresponding to the positions of the fixing protrusions, the fixing protrusions and fixing grooves are mortised and tenoned together, the circumference of the brake ring is provided with limiting protrusions corresponding to the positions of the limiting grooves, and the limiting protrusions and limiting grooves are fixedly connected.

[0014] In some implementations, the shaft is fixedly connected to the center of the unlocking ring by interference fit, welding, or riveting.

[0015] The beneficial effects of this utility model are as follows:

[0016] This backlash-eliminating electric actuator combines an electric drive element and a backlash-eliminating component. The drive gear of the electric actuator has no sensitive backlash when rotating, resulting in good perceived quality for end users. Since the backlash-eliminating component and the electric drive element are two independent modules, different electric drive elements can be adapted to meet the application requirements of different scenarios. The overall structure is simple, the size is small, and it is convenient for multi-scenario applications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0018] Figure 2 This is an exploded view of the structure of Example 1;

[0019] Figure 3 This is a schematic cross-sectional view of the gap-eliminating component in Example 1;

[0020] Figure 4 This is a schematic cross-sectional view of the gap-eliminating component in Example 2;

[0021] The labels and names in the diagram correspond as follows: 1. Electric actuator; 2. Backlash elimination assembly; 3. Drive gear; 22. Brake ring; 23. Unlocking ring; 24. Brake roller; 25. Brake spring; 26. Shaft core; 31. Drive unit; 32. Wedge groove; 211. Support plate; 212. Housing; 231. Drive finger; 261. Step sleeve; 2121. Fixing protrusion; 2122. Limiting groove; 2111. Fixing groove; 221. Limiting protrusion. Detailed Implementation

[0022] 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.

[0023] This utility model provides a technical solution:

[0024] Example 1

[0025] Please see Figure 1 An electric actuator for eliminating backlash includes an electric actuator 1, a backlash elimination assembly 2, and a drive gear 3. The backlash elimination assembly 2 includes a bracket cover fixed relative to the car seat base, a brake ring 22, an unlocking ring 23, a brake roller 24, a brake spring 25, and a shaft core 26. The output end of the electric actuator 1 is a rotating motor. The bracket cover includes a bracket plate 211 and a housing 212, which are assembled and cannot rotate relative to each other. The brake ring 22, unlocking ring 23, brake roller 24, and brake spring 25 are disposed between the bracket plate 211 and the housing 212. The brake ring 22, unlocking ring 23, shaft core 26, and drive gear 3 are coaxially arranged.

[0026] The housing 212 has multiple fixing protrusions 2121 and limiting grooves 2122 on its circumference. The support plate 211 has fixing grooves 2111 that correspond to the positions of the fixing protrusions 2121. The fixing protrusions 2121 and fixing grooves 2111 are tenon-and-mortise engaged, so that the housing 212 and the support plate 211 cannot rotate relative to each other. The brake ring 22 has limiting protrusions 221 that correspond to the positions of the limiting grooves 2122 on its circumference. The limiting protrusions 221 and limiting grooves 2122 are fixedly connected, so that the housing 212 and the brake ring 22 cannot rotate relative to each other.

[0027] Please see Figure 2 and Figure 3The brake ring 22 is annular and has a limiting annular surface. The unlocking ring 23 has a driving finger 231 on the side facing the brake ring 22. The driving gear 3 has a driving part 31 fixed on the side facing the brake ring 22. The driving part 31, driving finger 231, brake roller 24, and brake spring 25 are located at the center of the brake ring 22. The driving finger 231, brake roller 24, and brake spring 25 are positioned between the circumferential surface of the driving part 31 and the limiting annular surface. The brake roller 24 is positioned between the driving finger 231 and the brake spring 25. The brake roller 24, brake spring 25, and brake roller 25 are sequentially arranged between adjacent driving fingers 231. The two ends of the brake spring 25 are respectively connected to the corresponding brake roller 24. The drive unit 31 has a drive groove 32 on its circumferential surface, corresponding to the position of the brake roller 24. The drive groove 32 is wedge-shaped, and the brake spring 25 is disposed between the drive grooves 32. The brake roller 24 rotates in the drive groove 32, and the drive groove 32 restricts the positional movement of the brake roller 24. The brake roller 24 can also drive the drive unit 31 by abutting against the drive groove 32. The brake spring 25 not only separates the brake rollers 24 from each other but also ensures that the brake roller 24 is always pressed against the drive groove 32. The brake spring 25 and the brake roller 24 can counteract slight wobbling generated during transmission.

[0028] The shaft core 26 is fixedly connected to the center of the unlocking ring 23, which can be achieved by riveting or welding.

[0029] The shaft core 26 is fixedly connected to the output end of the electric actuator 1. The end of the shaft core 26 connected to the electric actuator 1 is non-cylindrical to prevent relative rotation between the shaft core 26 and the output end of the electric actuator 1. To limit the axial movement of the shaft core 26, the shaft core 26 is connected to the output end of the electric actuator 1 by screws or a self-locking spring, facilitating the replacement of the electric actuator 1. To compensate for the distance between the electric actuator 1 and the backlash elimination element, a stepped sleeve 261 is fixedly provided around the circumference of the shaft core 26, and the stepped sleeve 261 is positioned between the electric actuator 1 and the backlash elimination element.

[0030] The working principle and usage process of this utility model are as follows: When working, the output end of the electric actuator 1 rotates, which drives the shaft core 26 to rotate. The shaft core 26 drives the unlocking ring 23 to rotate. The driving finger 231 of the shaft core 26 applies force to the brake roller 24, thereby driving the brake roller 24 to abut against the side wall of the drive groove 32, and then pushing the drive gear 3 to rotate.

[0031] When the electric actuator 1 stops working, the drive finger 231 does not apply force to the brake roller 24 and the brake spring 25. Due to the cooperation between the drive groove 32 and the brake roller 24, the drive gear 3 is prevented from rotating relative to the unlocking ring 23 in the rotational direction.

[0032] Example 2

[0033] Please see Figure 4 The difference from Embodiment 1 is that the positional relationship between the drive groove 32, the drive finger 231, and the brake spring 25 is different. The drive finger 231 and the brake spring 25 are respectively arranged in the drive groove 32. The brake roller 24, the brake spring 25, and the brake roller 24 are arranged sequentially between adjacent drive fingers 231. The two ends of the brake spring 25 abut against the corresponding brake roller 24. One side of the drive finger 231 abuts against the side wall of the drive groove 32, and the other side abuts against the brake roller 24.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. An electric actuator for eliminating backlash, characterized in that, The device includes an electric actuator (1), a backlash elimination assembly (2), and a drive gear (3). The backlash elimination assembly (2) includes a brake ring (22), an unlocking ring (23), a brake roller (24), a brake spring (25), and a shaft (26). The output end of the electric actuator (1) is fixedly connected to the center of the unlocking ring (23) through the shaft (26). The unlocking ring (23) has a drive finger (231) on the side facing the brake ring (22). The drive gear (3) has a drive part (31) fixedly on the side facing the brake ring (22). The brake ring (22) has a limiting annular surface. The circumferential surface of the drive part (31) has a drive groove (32). The brake roller (24) is restricted between the drive groove and the limiting annular surface. The brake roller (24) is disposed between the drive finger (231) and the brake spring (25).

2. The electric actuator for eliminating backlash according to claim 1, characterized in that, The brake spring (25) is connected to the corresponding brake roller (24) at both ends, and the brake roller (24) and brake spring (25) are arranged between adjacent drive fingers (231).

3. The electric actuator for eliminating backlash according to claim 1, characterized in that, The drive groove (32) is wedge-shaped, and the brake spring (25) is disposed between adjacent drive grooves (32).

4. The electric actuator for eliminating backlash according to claim 1, characterized in that, The drive finger (231) and the brake spring (25) are respectively disposed in the drive groove (32).

5. The electric actuator for eliminating backlash according to claim 1, characterized in that, The end of the shaft (26) connected to the electric actuator (1) is non-cylindrical, and the shaft (26) is connected to the output end of the electric actuator (1) by screws or self-locking springs.

6. The electric actuator for eliminating backlash according to claim 1, characterized in that, The circumference of the shaft core (26) is fixedly provided with a stepped sleeve (261), which is disposed between the electric actuator (1) and the backlash elimination element.

7. The electric actuator for eliminating backlash according to claim 1, characterized in that, The two ends of the brake spring (25) are respectively connected to the corresponding brake rollers (24).

8. The electric actuator for eliminating backlash according to claim 1, characterized in that, The gap elimination assembly (2) includes a bracket cover, which includes a bracket plate (211) and a housing (212) that are assembled and cannot rotate relative to each other. The brake ring (22), unlocking ring (23), brake roller (24) and brake spring (25) are disposed between the bracket plate (211) and the housing (212).

9. The electric actuator for eliminating backlash according to claim 8, characterized in that, The housing (212) has multiple fixing protrusions (2121) and limiting grooves (2122) on its circumference. The bracket plate (211) has a fixing groove (2111) that corresponds to the position of the fixing protrusions (2121). The fixing protrusions (2121) and the fixing grooves (2111) are tenon-and-mortise joined together. The brake ring (22) has a limiting protrusion (221) that corresponds to the position of the limiting grooves (2122) on its circumference. The limiting protrusions (221) and the limiting grooves (2122) are fixedly connected.

10. The electric actuator for eliminating backlash according to claim 1, characterized in that, The shaft core (26) is fixedly connected to the center of the unlocking ring (23) by interference fit, welding or riveting.

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