Brake structure for electric push rod

Abstract

This invention relates to the technical field of electric linear actuators, and discloses a braking structure for electric linear actuators, including a motor, a connecting section formed by the bottom of a worm gear and the top of a motor shaft, an adapter sleeve fitted on the connecting section, a wear-resistant sleeve on the outer periphery of the adapter sleeve, and a torsion spring that generates frictional resistance between the wear-resistant sleeve and the internal cavity; an elastically deformable friction ring fitted in the motor shaft, and multiple transversely arranged elastic elements in the elastic cavity; the connecting section drives the wear-resistant sleeve to rotate, and the reaction force generated by the friction between the wear-resistant sleeve and the torsion spring limits the automatic movement of the worm gear and motor shaft when stationary; the motor shaft drives the frictional resistance between the friction ring and the inner wall of the internal cavity, which limits the automatic movement of the motor shaft when stationary, increasing the braking capability of the electric linear actuator, realizing a self-locking function, effectively improving the mechanical safety of the motor, and increasing the frictional deformation of the friction ring by the elastic elements, effectively reducing the frictional resistance of the motor shaft during rapid rotation.

Description

Technical Field

[0001] This invention relates to the technical field of electric linear actuators, and more specifically, to a braking structure used in electric linear actuators. Background Technology

[0002] Electric linear actuators are general-purpose auxiliary drive devices widely used in various industries. They convert the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator and can be used as actuators to achieve remote control, centralized control, or automatic control.

[0003] The main working principle of an electric linear actuator is that a motor drives a lead screw to rotate. A transmission nut is installed on the lead screw. When the lead screw rotates, it drives the transmission nut to reciprocate. The transmission between the motor and the lead screw is usually achieved by a worm gear mechanism or a transmission gear.

[0004] When the electric actuator is stationary, the solar panel will be subjected to high-frequency impacts when there is wind or a typhoon. This will cause the support to shake continuously, and the electric actuator will be subjected to one-way or two-way impacts, causing the electric actuator to slide down. Currently, the electric actuator uses a common motor to drive linear stroke components, which has poor self-locking ability. Summary of the Invention

[0005] The purpose of this invention is to provide a braking structure for electric linear actuators, which aims to solve the problem in the prior art where electric linear actuators slide down after being subjected to high-frequency unidirectional or bidirectional impacts.

[0006] This invention is implemented as follows: a braking structure for an electric actuator includes a motor with an internal cavity for powering a motor shaft to rotate. A worm gear, which rotates with the motor shaft, is connected to the motor shaft. The worm gear and the motor shaft are longitudinally aligned, and the bottom of the worm gear is connected to the top of the motor shaft to form a connecting section. An adapter sleeve is fitted onto the connecting section and is arranged around the outer periphery of the connecting section. A wear-resistant sleeve is provided on the outer periphery of the adapter sleeve and is arranged around the outer periphery of the adapter sleeve. The adapter sleeve is located between the connecting section and the wear-resistant sleeve. A torsion spring, which generates frictional resistance with the wear-resistant sleeve, is provided between the wear-resistant sleeve and the internal cavity. One end of the torsion spring is fixedly connected to the internal cavity, and the other end of the torsion spring is arranged spirally around the outer periphery of the wear-resistant sleeve. The wear-resistant sleeve and the torsion spring move and abut against each other to form frictional resistance.

[0007] A friction ring with elastic deformation is sleeved in the motor shaft. The friction ring is arranged around the outer circumference of the motor shaft and is located below the wear-resistant sleeve. The inner wall of the inner cavity and the outer circumference of the motor shaft are connected by the friction ring to form frictional resistance. The friction ring has an elastic cavity with a bottom opening. The elastic cavity is arranged around the circumference of the friction ring. The elastic cavity is provided with multiple transversely arranged elastic elements, which are spaced apart around the circumference of the elastic cavity.

[0008] Furthermore, the friction ring has an outer ring wall and an inner ring wall. The outer ring wall is arranged around the outer periphery of the inner ring wall, and there is a gap between the inner ring wall and the outer ring wall. The top of the inner ring wall and the top of the outer ring wall are connected as one unit to form a closed ring. The outer ring wall, the inner ring wall and the closed ring together form the elastic cavity with an open bottom.

[0009] The outer end of the elastic element abuts against the inner side wall of the outer ring wall, and the inner end of the elastic element abuts against the outer side wall of the inner ring wall. The inner side wall of the inner ring wall is fixed around the outer circumference of the motor shaft.

[0010] Furthermore, the bottom of the inner surrounding wall has a support ring extending toward the outer surrounding wall. The support ring is located on the bottom opening of the elastic cavity, and there is a gap between the support ring and the outer surrounding wall. The support ring abuts against the bottom of the elastic member.

[0011] Furthermore, the inner wall of the adapter sleeve abuts against the outer periphery of the connecting section, and a plurality of embedding blocks are protruding on the outer wall of the adapter sleeve and embedded in the wear-resistant sleeve. The plurality of embedding blocks are arranged at intervals along the axial direction of the adapter sleeve and at intervals around the circumference of the adapter sleeve.

[0012] Furthermore, the inner wall of the wear-resistant sleeve is provided with multiple slots for the insertion blocks to fit into.

[0013] Furthermore, the outer side of the wear-resistant sleeve has a surrounding groove that is opposite to the torsion spring recess. The surrounding groove is arranged around the outer periphery of the middle part of the wear-resistant sleeve, and the torsion spring moves and abuts against the groove circumferentially.

[0014] Furthermore, there is a rotational gap between the wear-resistant sleeve and the inner wall of the internal cavity, and the torsion spring is located in the rotational gap.

[0015] Furthermore, the connecting section has a limiting groove that restricts the up-and-down movement of the adapter sleeve. The limiting groove is arranged around the outer periphery of the connecting section, and the inner sidewall of the adapter sleeve abuts against the limiting groove.

[0016] Furthermore, the inner wall of the adapter sleeve has a plurality of protruding teeth that mesh with the connecting section, and the plurality of protruding teeth are arranged at intervals around the inner wall of the adapter sleeve in a circumferential manner.

[0017] The connecting section has multiple tooth grooves for meshing of convex teeth, and the multiple tooth grooves are arranged at intervals around the circumference of the limiting groove.

[0018] Furthermore, the bottom of the worm is provided with an elastically deformable buffer layer, which covers the bottom end face of the worm. The bottom end face of the worm has a filling cavity that is recessed away from the buffer layer. The filling cavity is arranged opposite to the buffer layer. The bottom end face of the worm is connected to the top end face of the motor shaft through the buffer layer.

[0019] Compared with existing technologies ， The braking structure for electric linear actuators provided by this invention uses a connecting section to drive the wear-resistant sleeve to rotate. The reaction force generated by the friction between the wear-resistant sleeve and the torsion spring restricts the automatic movement of the worm gear and motor shaft when stationary, increasing the braking capability of the electric linear actuator. The motor, through its shaft, drives the friction ring to interact with the inner wall of the internal cavity, thus limiting the automatic movement of the motor shaft when stationary, further increasing the braking capability of the electric linear actuator and achieving a self-locking function. This effectively improves the mechanical safety of the motor. By increasing the frictional deformation of the friction ring through an elastic element, the frictional resistance of the motor shaft during rapid rotation is effectively reduced. This invention also solves the problem of electric linear actuators sliding down after being subjected to high-frequency unidirectional or bidirectional impacts. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the braking structure applied to an electric push rod provided by the present invention;

[0021] Figure 2 This is a partial cross-sectional three-dimensional structural schematic diagram of the brake structure applied to an electric actuator provided by the present invention;

[0022] Figure 3 This is the present invention. Figure 2 Enlarged diagram of A in the middle;

[0023] Figure 4 This is a cross-sectional three-dimensional structural diagram of the friction ring provided by the present invention;

[0024] Figure 5 This is an exploded perspective view of the wear-resistant sleeve and adapter sleeve provided by the present invention.

[0025] In the diagram: Motor 100, Motor Shaft 200, Worm Gear 300, Connecting Section 400, Adapter Sleeve 500, Wear-resistant Sleeve 600, Torsion Spring 700, Friction Ring 800, Internal Cavity 101, Buffer Layer 301, Filling Cavity 302, Limiting Groove 401, Tooth Groove 402, Embedded Block 501, Protruding Tooth 502, Slot 601, Surrounding Groove 602, Elastic Cavity 801, Elastic Component 802, Outer Surrounding Wall 803, Inner Surrounding Wall 804, Closing Ring 805, Support Ring 806. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0028] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Reference Figure 1-5 The image shows a preferred embodiment of the present invention.

[0030] A braking structure for an electric linear actuator includes a motor 100, which has an internal cavity 101 for rotating a motor shaft 200. A worm gear 300, which rotates with the motor shaft 200, is connected to the motor shaft 200. The worm gear 300 and the motor shaft 200 are arranged longitudinally, and the bottom of the worm gear 300 is connected to the top of the motor shaft 200 to form a connecting section 400. An adapter sleeve 500 is fitted onto the connecting section 400 and is arranged around the outer periphery of the connecting section 400. A wear-resistant sleeve 600 is provided on the outer periphery of the 00. The wear-resistant sleeve 600 is arranged around the outer periphery of the adapter sleeve 500. The adapter sleeve 500 is located between the connecting section 400 and the wear-resistant sleeve 600. A torsion spring 700 that generates frictional resistance with the wear-resistant sleeve 600 is provided between the wear-resistant sleeve 600 and the internal cavity 101. One end of the torsion spring 700 is fixedly connected to the internal cavity 101, and the other end of the torsion spring 700 is arranged to spiral around the outer periphery of the wear-resistant sleeve 600. The wear-resistant sleeve 600 and the torsion spring 700 move and abut against each other to form frictional resistance.

[0031] A friction ring 800 with elastic deformation is sleeved in the motor shaft 200. The friction ring 800 is arranged around the outer periphery of the motor shaft 200 and is located below the wear-resistant sleeve 600. The inner sidewall of the inner cavity 101 and the outer periphery of the motor shaft 200 are in contact with each other through the friction ring 800 to form frictional resistance. The friction ring 800 has an elastic cavity 801 with a bottom opening. The elastic cavity 801 is arranged around the circumference of the friction ring 800. The elastic cavity 801 is provided with a plurality of transversely arranged elastic elements 802. The plurality of elastic elements 802 are arranged at intervals around the circumference of the elastic cavity 801.

[0032] The braking structure provided above for electric linear actuators uses the connecting section 400 to drive the wear-resistant sleeve 600 to rotate. The reaction force generated by the friction between the wear-resistant sleeve 600 and the torsion spring 700 limits the automatic movement of the worm gear 300 and the motor shaft 200 when stationary, increasing the braking capability of the electric linear actuator. The motor 100, through the motor shaft 200, drives the friction ring 800 to drive the friction resistance between the friction ring 800 and the inner wall of the internal cavity 101, limiting the automatic movement of the motor shaft 200 when stationary, increasing the braking capability of the electric linear actuator, realizing the self-locking function, and effectively improving the mechanical safety of the motor 100. The elastic element 802 increases the frictional deformation of the friction ring 800, effectively reducing the frictional resistance of the motor shaft 200 during rapid rotation; and solves the problem of the electric linear actuator sliding down after being subjected to high-frequency unidirectional or bidirectional impacts.

[0033] The braking function of the electric actuator is improved by using the wear-resistant sleeve 600 and the friction ring 800 to provide dual frictional resistance.

[0034] The elastic element 802 can be a spring, a rubber strip, or a telescopic column with elasticity.

[0035] In this embodiment, the friction ring 800 has an outer surrounding wall 803 and an inner surrounding wall 804. The outer surrounding wall 803 is arranged around the outer periphery of the inner surrounding wall 804, and there is a gap between the inner surrounding wall 804 and the outer surrounding wall 803. The top of the inner surrounding wall 804 and the top of the outer surrounding wall 803 are connected to form a closed ring 805. The outer surrounding wall 803, the inner surrounding wall 804 and the closed ring 805 enclose an elastic cavity 801 with a bottom opening.

[0036] The outer end of the elastic element 802 abuts against the inner sidewall of the outer ring wall 803, and the inner end of the elastic element 802 abuts against the outer sidewall of the inner ring wall 804. The inner sidewall of the inner ring wall 804 is fixed around the outer periphery of the motor shaft 200.

[0037] The elastic deformation of the friction ring 800 during the active friction process is increased by the elastic cavity 801 with the bottom opening. When the motor shaft 200 rotates at low speed, the frictional resistance between the friction ring 800 and the inner wall of the inner cavity 101 remains unchanged. When the motor shaft 200 rotates at high speed, the friction ring 800 will rub and elastically deform during high-speed rotation, thereby reducing the frictional resistance of the motor shaft 200 during rapid rotation.

[0038] The bottom of the inner surrounding wall 804 has a support ring 806 extending toward the outer surrounding wall 803. The support ring 806 is located on the bottom opening of the elastic cavity 801, and there is a gap between the support ring 806 and the outer surrounding wall 803. The support ring 806 abuts against the bottom of the elastic member 802. In this way, the support ring 806 can prevent the elastic member 802 from falling out of the elastic cavity 801 and can also increase the support of the elastic member 802.

[0039] The inner wall of the adapter sleeve 500 abuts against the outer periphery of the connecting section 400. The outer wall of the adapter sleeve 500 is provided with a plurality of insert blocks 501 that are embedded in the wear-resistant sleeve 600. The plurality of insert blocks 501 are arranged at intervals along the axial direction of the adapter sleeve 500 and at intervals around the circumference of the adapter sleeve 500. The inner wall of the wear-resistant sleeve 600 is provided with a plurality of slots 601 for the insert blocks 501 to fit into. In this way, the connection between the adapter sleeve 500 and the wear-resistant sleeve 600 can be improved, thereby improving the stability of the adapter sleeve 500 driving the wear-resistant sleeve 600 to rotate.

[0040] In this embodiment, the outer side of the wear-resistant sleeve 600 has a surrounding groove 602 that is recessed away from the torsion spring 700. The surrounding groove 602 is arranged around the outer periphery of the middle part of the wear-resistant sleeve 600, and the torsion spring 700 moves and abuts against the surrounding groove 602 in a circumferential direction.

[0041] The wear-resistant sleeve 600 prevents the torsion spring 700 from disengaging during rotational friction with the wear-resistant sleeve 600 through the surrounding groove 602, thereby improving the frictional stability between the wear-resistant sleeve 600 and the torsion spring 700.

[0042] There is a rotational gap between the wear-resistant sleeve 600 and the inner wall of the internal cavity 101, and the torsion spring 700 is located in the rotational gap; in this way, the wear-resistant sleeve 600 will not directly generate frictional resistance with the inner wall of the internal cavity 101, thus avoiding frictional damage to the inner wall of the internal cavity 101 caused by the wear-resistant sleeve 600.

[0043] The connecting section 400 has a limiting groove 401 that restricts the up and down movement of the adapter sleeve 500. The limiting groove 401 is arranged around the outer periphery of the connecting section 400, and the inner sidewall of the adapter sleeve 500 abuts against the limiting groove 401. In this way, the connecting section 400 can limit the position of the adapter sleeve 500 through the limiting groove 401, so as to prevent the adapter sleeve 500 from deviating during rotation and causing the braking structure to be incomplete.

[0044] In this embodiment, the inner wall of the adapter sleeve 500 has a plurality of protruding teeth 502 that mesh with the connecting section 400, and the plurality of protruding teeth 502 are arranged at intervals around the inner wall of the adapter sleeve 500.

[0045] The connecting section 400 has multiple tooth grooves 402 for meshing with the protruding teeth 502, and the multiple tooth grooves 402 are arranged at intervals around the circumference of the limiting groove 401.

[0046] The adapter sleeve 500 engages with multiple toothed grooves 402 of the connecting section 400 through multiple protruding teeth 502, thereby increasing the stability when the connecting section 400 drives the adapter sleeve 500 to rotate. This increases the reaction force generated by the friction between the adapter sleeve 500 and the wear-resistant sleeve 600 and the torsion spring 700, thereby limiting the automatic movement of the worm gear 300 and the motor shaft 200 when stationary, and increasing the braking capability of the electric push rod.

[0047] In this embodiment, the bottom of the worm 300 is provided with an elastically deformable buffer layer 301, which covers the bottom end surface of the worm 300. The bottom end surface of the worm 300 has a filling cavity 302 that is recessed away from the buffer layer 301. The filling cavity 302 is arranged opposite to the buffer layer 301. The bottom end surface of the worm 300 is connected to the top end surface of the motor shaft 200 through the buffer layer 301.

[0048] The buffer layer 301 reduces the collision loss between the worm gear 300 and the motor shaft 200 during transmission and also improves the buffering effect between the two during rotation, effectively increasing the service life of the worm gear 300 and the motor shaft 200.

[0049] Furthermore, when the buffer layer 301 is subjected to compression deformation, the worm gear 300 provides space for the buffer layer 301 to extend in a directional manner through the filling cavity 302, thereby preventing the buffer layer 301 from being damaged by compression deformation on other components.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A brake structure for an electric push rod, characterized by, The device includes a motor with an internal cavity for rotating a motor shaft. A worm gear, which rotates with the motor shaft, is connected to the motor shaft. The worm gear and the motor shaft are longitudinally aligned, and the bottom of the worm gear is connected to the top of the motor shaft to form a connecting section. An adapter sleeve is fitted onto the connecting section and is arranged around the outer periphery of the connecting section. A wear-resistant sleeve is provided on the outer periphery of the adapter sleeve and is arranged around the outer periphery of the adapter sleeve. The adapter sleeve is located between the connecting section and the wear-resistant sleeve. A torsion spring, which generates frictional resistance with the wear-resistant sleeve, is provided between the wear-resistant sleeve and the internal cavity. One end of the torsion spring is fixedly connected to the internal cavity, and the other end of the torsion spring is arranged spirally around the outer periphery of the wear-resistant sleeve. The wear-resistant sleeve and the torsion spring move and abut against each other to form frictional resistance. A friction ring with elastic deformation is sleeved in the motor shaft. The friction ring is arranged around the outer circumference of the motor shaft and is located below the wear-resistant sleeve. The inner wall of the inner cavity and the outer circumference of the motor shaft are connected by the friction ring to form frictional resistance. The friction ring has an elastic cavity with a bottom opening. The elastic cavity is arranged around the circumference of the friction ring. The elastic cavity is provided with multiple transversely arranged elastic elements, which are spaced apart around the circumference of the elastic cavity.

2. The brake structure for an electric push rod according to claim 1, wherein The friction ring has an outer ring wall and an inner ring wall. The outer ring wall is arranged around the outer periphery of the inner ring wall, and there is a gap between the inner ring wall and the outer ring wall. The top of the inner ring wall and the top of the outer ring wall are connected as one piece to form a closed ring. The outer ring wall, the inner ring wall and the closed ring together form the elastic cavity with an open bottom. The outer end of the elastic element abuts against the inner side wall of the outer ring wall, and the inner end of the elastic element abuts against the outer side wall of the inner ring wall. The inner side wall of the inner ring wall is fixed around the outer circumference of the motor shaft.

3. The braking structure for an electric actuator as described in claim 2, characterized in that, The bottom of the inner surrounding wall has a support ring extending toward the outer surrounding wall. The support ring is located on the bottom opening of the elastic cavity and is spaced apart from the outer surrounding wall. The support ring abuts against the bottom of the elastic element.

4. The braking structure for use in an electric actuator as described in any one of claims 1 to 3, characterized in that, The inner wall of the adapter sleeve abuts against the outer periphery of the connecting section. Multiple embedding blocks are protruding from the outer wall of the adapter sleeve and embedded in the wear-resistant sleeve. The multiple embedding blocks are arranged at intervals along the axial direction of the adapter sleeve and at intervals around the circumference of the adapter sleeve.

5. The braking structure for an electric actuator as described in claim 4, characterized in that, The inner wall of the wear-resistant sleeve is provided with multiple slots for the insertion blocks to fit into.

6. The braking structure for an electric actuator as described in claim 5, characterized in that, The wear-resistant sleeve has a surrounding groove on its outer side that is opposite to the torsion spring recess. The surrounding groove is arranged around the outer periphery of the middle part of the wear-resistant sleeve, and the torsion spring moves and abuts against the groove circumferentially.

7. The braking structure for an electric actuator as described in claim 6, characterized in that, There is a rotational gap between the wear-resistant sleeve and the inner wall of the internal cavity, and the torsion spring is located in the rotational gap.

8. The braking structure for use in an electric actuator as described in any one of claims 1 to 3, characterized in that, The connecting section has a limiting groove that restricts the up-and-down movement of the adapter sleeve. The limiting groove is arranged around the outer periphery of the connecting section, and the inner sidewall of the adapter sleeve abuts against the limiting groove.

9. The braking structure for an electric actuator as described in claim 8, characterized in that, The inner wall of the adapter sleeve has a plurality of protruding teeth that mesh with the connecting section, and the plurality of protruding teeth are arranged at intervals around the inner wall of the adapter sleeve in a circumferential manner. The connecting section has multiple tooth grooves for meshing of convex teeth, and the multiple tooth grooves are arranged at intervals around the circumference of the limiting groove.

10. The braking structure for use in an electric actuator as described in any one of claims 1 to 3, characterized in that, The bottom of the worm gear is provided with an elastically deformable buffer layer, which covers the bottom end face of the worm gear. The bottom end face of the worm gear has a filling cavity that is recessed away from the buffer layer. The filling cavity is arranged opposite to the buffer layer. The bottom end face of the worm gear is connected to the top end face of the motor shaft through the buffer layer.

Images