An electric push rod

Abstract

The application relates to an electric push rod, belonging to the field of mechanical driving devices, which comprises a machine cylinder, a driving motor, a transmission assembly and a pushing assembly, the pushing assembly comprises a driving screw rod, a connecting screw sleeve which is screwed on the outside of the driving screw rod and a push rod which is screwed on the outside of the connecting screw sleeve, the output end of the transmission assembly drives the driving screw rod to rotate, one end of the push rod which is far away from the driving screw rod slides through the outlet of the machine cylinder, the outside of the connecting screw sleeve is fixedly provided with a sliding limiting block, and the sliding limiting block is slidably arranged in the machine cylinder. The application has the effect that the telescopic stroke of the electric push rod can be adjusted.

Description

Technical Field

[0001] This application relates to the technical field of mechanical drive equipment, and in particular to an electric linear actuator. Background Technology

[0002] An electric linear actuator is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a actuator. For example, Chinese patent CN222441469U, entitled "A Transmission Structure for an Electric Linear Actuator and an Electric Linear Actuator," describes an electric linear actuator as mainly comprising: a motor, a gear and worm gear structure, and a lead screw pushing structure. The main function of the worm gear structure is to act as a transmission medium for rotary motion, enabling adjustment of speed and output torque. The lead screw pushing structure mainly includes a screw and a telescopic tube. When the motor's drive shaft drives the screw to rotate through the worm gear structure, the telescopic tube rotates relative to the screw, and simultaneously, the telescopic tube extends and retracts along the length of the screw (the forward and reverse rotation of the motor adjusts the direction of motion; the outer cylinder restricts the rotation of the telescopic tube, allowing only lateral movement).

[0003] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: since the lengths of the screw and the telescopic tube are fixed, the total stroke displacement of the lead screw is also fixed. In order to broaden the applicability of the electric linear actuator, there is an urgent need for a new type of electric linear actuator with adjustable stroke displacement. Summary of the Invention

[0004] In order to adjust the extension and retraction stroke of the electric linear actuator, this application provides an electric linear actuator.

[0005] This application provides an electric linear actuator, which adopts the following technical solution: An electric linear actuator includes a barrel, a drive motor, a transmission assembly, and a pushing assembly. The pushing assembly includes a drive screw, a connecting sleeve threaded to the outside of the drive screw, and a push rod threaded to the outside of the connecting sleeve. The output end of the transmission assembly drives the drive screw to rotate. One end of the push rod away from the drive screw slides through the outlet of the barrel. A sliding limit block is fixedly provided on the outside of the connecting sleeve, and the sliding limit block is slidably disposed inside the barrel.

[0006] By adopting the above technical solution, the connection length between the connecting sleeve and the push rod can be adjusted by threading the push rod with the connecting sleeve, thereby adjusting the length of the push rod protruding from the barrel, so as to adjust the extension and retraction stroke of the electric push rod.

[0007] Optionally, the connecting sleeve is provided with an abutment ring that abuts against the end of the push rod, and the abutment ring is threaded to the outside of the push rod.

[0008] By adopting the above technical solution, the push rod is supported by the abutment ring, which improves the stability of the push rod position to a certain extent.

[0009] Optionally, the abutment ring is provided with a positioning groove, and the end of the push rod is provided with a positioning part that is embedded in the positioning groove.

[0010] By adopting the above technical solution, the connection tightness between the abutment ring and the end of the push rod is further improved by embedding the positioning part into the positioning groove, thereby providing better support and positioning for the push rod.

[0011] Optionally, a positioning protrusion and a fixing snap ring are provided on the outer wall of the connecting threaded sleeve, and the two ends of the sliding limiting block abut against the positioning protrusion and the fixing snap ring, respectively.

[0012] By adopting the above technical solution, the connecting screw sleeve is positioned by fixing the snap ring, which facilitates the installation of the sliding limit block.

[0013] Optionally, a stepped groove is provided on the outer wall of the connecting threaded sleeve, and a stepped ring is provided at the end of the sliding limiting block away from the positioning protrusion ring, which is embedded in the stepped groove, and the fixing snap ring abuts against the stepped ring.

[0014] By adopting the above technical solution, embedding the stepped ring into the stepped groove can further improve the stability of the connection between the connecting threaded sleeve and the sliding limit block, and make the structure more compact.

[0015] Optionally, a retaining ring groove is provided on the outer wall of the connecting screw sleeve for the retaining ring to be inserted, and a clearance groove is provided on the connecting screw sleeve, the clearance groove being connected to the side of the retaining ring groove away from the sliding limit block.

[0016] By adopting the above technical solution, when the fixed retaining ring deforms due to the compression of the stepped ring, the fixed retaining ring can generate elastic potential energy to press against the stepped ring, thereby better pressing against the sliding limit block.

[0017] Optionally, a sealing rubber ring is provided at the outlet of the barrel, and the push rod slides through the sealing rubber ring.

[0018] By adopting the above technical solution, the sealing between the push rod and the outlet of the barrel is improved, thereby enhancing the dustproof and waterproof effects.

[0019] Optionally, the transmission assembly is a gear set structure, with the end of the drive screw inserted into the output gear of the gear set structure, and the drive screw rotating synchronously with the output gear.

[0020] By adopting the above technical solution and using a gear set structure, the rotational speed and torque can be adjusted.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The push rod is threadedly connected to the connecting sleeve, thereby adjusting the connection length between the connecting sleeve and the push rod, which in turn adjusts the length of the push rod protruding from the barrel, thus adjusting the extension and retraction stroke of the electric push rod; 2. By embedding the positioning part into the positioning groove, the connection tightness between the abutment ring and the end of the push rod is further improved, thereby providing better support and positioning for the push rod; 3. When the fixed retaining ring deforms due to the compression of the stepped ring, the fixed retaining ring can generate elastic potential energy to press against the stepped ring, thereby better pressing against the sliding limit block. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the electric actuator in the embodiments of this application.

[0023] Figure 2 This is a cross-sectional view of the electric actuator in the embodiments of this application.

[0024] Figure 3 This is an exploded view of the internal structure of the electric actuator in the embodiments of this application.

[0025] Figure 4 yes Figure 2 Enlarged view of part A in the middle.

[0026] Figure 5 This is an exploded view of the connecting screw sleeve in an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the abutment ring in another embodiment.

[0028] Explanation of reference numerals in the attached drawings: 1. Drive motor; 2. Transmission assembly; 21. Output gear; 22. Mounting screw; 3. Push assembly; 4. Drive screw; 5. Connecting sleeve; 51. Abutment ring; 511. Positioning groove; 512. Sliding groove; 52. Positioning convex ring; 53. Fixing circlip; 54. Step groove; 55. Circlip groove; 56. Clearance groove; 57. Sliding limit block; 571. Step ring; 527. Screw hole; 6. Push rod; 61. Positioning part; 7. Barrel; 71. Sealing rubber ring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses an electric linear actuator. (Refer to...) Figure 1-2The electric linear actuator includes a barrel 7, a drive motor 1, a transmission assembly 2 disposed inside the barrel 7, and a pushing assembly 3. In this embodiment, the transmission assembly 2 adopts a gear set structure. The output shaft of the drive motor 1 drives the gear set structure to rotate. Through the meshing relationship between multiple gears, the output speed and output torque are adjusted. The gear set structure has an output gear 21, which drives the pushing assembly 3 to work. The gear set structure is existing technology, and it only requires adjustment of the gear transmission ratio by adjusting the gear radius and number of teeth according to the actual torque and speed requirements. It will not be described in detail in this embodiment.

[0031] Reference Figure 2-3 The pushing component 3 includes a drive screw 4, a connecting sleeve 5 threaded to the outside of the drive screw 4, and a push rod 6 threaded to the outside of the connecting sleeve 5. The end of the drive screw 4 is inserted into the output gear 21, and the drive screw 4 rotates synchronously with the output gear 21. Specifically, the end of the drive screw 4 can be square-shaped, and a corresponding groove can be formed inside the output gear 21 to achieve synchronous rotation; alternatively, the drive screw 4 and the output gear 21 can be connected by a key. The output gear 21 is provided with a mounting screw 22, which is threaded to the end of the drive screw 4 to achieve a detachable connection between the drive screw 4 and the output gear 21.

[0032] Reference Figure 2 , Figure 3 as well as Figure 5 A sliding limit block 57 is fixedly provided on the outer side of the connecting threaded sleeve 5. The sliding limit block 57 abuts against the inner wall of the barrel 7, thereby preventing the drive screw 4 and the sliding limit block 57 from rotating relative to each other. The connecting threaded sleeve 5 and the sliding limit block 57 can only slide within the barrel 7. When the drive motor 1 drives the drive screw 4 to rotate through the transmission assembly 2, due to the limiting effect of the sliding limit block 57, the connecting threaded sleeve 5 and the push rod 6 slide laterally within the barrel 7, and the end of the push rod 6 extends and retracts through the outlet of the barrel 7. The sliding direction of the push rod 6 depends on the forward and reverse directions of the drive motor 1. The fixed connection between the sliding limit block 57 and the connecting threaded sleeve 5 can be fixed by welding or by bolting, as long as the sliding limit block 57 and the connecting threaded sleeve 5 can rotate synchronously. In this embodiment, bolting is used, and the sliding limit block 57 has a threaded hole 572 for the screw to pass through. Reference Figure 3 and Figure 4 Since the end of the push rod 6 is threaded to the outside of the connecting sleeve 5, the connection length between the push rod 6 and the connecting sleeve 5 can be adjusted, thereby adjusting the length of the push rod 6 protruding from the outlet of the barrel 7, so as to realize the adjustment of the electric push rod stroke.

[0033] Reference Figure 4 and Figure 5 A connecting sleeve 5 is threaded with an abutment ring 51, which abuts against the end of the push rod 6, thus providing abutment support for the push rod 6. The abutment ring 51 has a positioning groove 511, and the end of the push rod 6 has a positioning part 61 that is embedded in the positioning groove 511 to improve the tightness of the connection between the abutment ring 51 and the push rod 6. Note that the abutment ring 51 is preferably not integrally formed with the push rod 6; otherwise, synchronous loosening may easily occur. That is, when the push rod 6 and the connecting sleeve 5 loosen and their relative positions change, the abutment ring 51 can, to a certain extent, limit the movement of the push rod 6.

[0034] Reference Figure 3-6 In another embodiment, the positioning groove 511 is recessed, and the positioning part 61 is columnar and embedded in the positioning groove 511, so that the abutment ring 51 can limit the push rod 6 in both directions. In this embodiment, a sliding groove 512 communicating with the positioning groove 511 is provided on the outer wall of the connecting threaded sleeve 5, so as to facilitate the sliding of the positioning part 61 into the positioning groove 511. During installation, the positioning part 61 can be slid into the positioning groove 511 first, and then the abutment ring 51 and the push rod 6 can be rotated simultaneously to thread the push rod 6 onto the outside of the connecting threaded sleeve 5.

[0035] A positioning protrusion 52 and a fixing snap ring 53 are provided on the outer wall of the connecting threaded sleeve 5. The positioning protrusion 52 and the fixing snap ring 53 abut against the two ends of the sliding limit block 57, thereby realizing the positioning of the sliding limit block 57. The positioning protrusion 52 is integrally connected to the connecting threaded sleeve 5.

[0036] The connecting screw sleeve 5 has a stepped groove 54, and the sliding limit block 57 has a stepped ring 571 embedded in the stepped groove 54. The outer wall of the connecting screw sleeve 5 has a retaining groove 55 for the retaining retaining ring 53 to be embedded in, and the end of the retaining retaining ring 53 abuts against the stepped ring.

[0037] In this embodiment, the side of the stepped ring 571 away from the positioning protrusion 52 slightly protrudes from the stepped groove 54, so that the retaining spring 53 can always abut against the side wall of the stepped ring 571. A relief groove 56 communicating with the retaining spring groove 55 is provided on the outer side wall of the connecting threaded sleeve 5. When the retaining spring 53 is fixedly installed in the retaining spring groove 55, the stepped ring 571 abuts against the outer ring of the retaining spring 53 to make it bend slightly outward. The relief groove 56 provides a certain relief space for this bending deformation.

[0038] The end of the barrel 7 furthest from the output gear 21 is the outlet. The end of the push rod 6 slides through the outlet. A sealing rubber ring 71 is fixedly installed on the inner wall of the barrel 7 to improve the sealing performance at the outlet and enhance waterproof and dustproof properties.

[0039] The implementation principle of an electric push rod in this application embodiment is as follows: the drive motor 1 rotates, which drives the gear set structure to rotate, and then drives the drive screw 4 to rotate. Due to the limiting effect of the sliding limit block 57 on the connecting screw sleeve 5, the connecting screw sleeve 5 and the push rod 6 slide along the length direction of the drive screw 4, thereby realizing the extension and retraction movement of the electric push rod.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric linear actuator, characterized in that: The assembly includes a barrel (7), a drive motor (1), a transmission assembly (2), and a push assembly (3). The push assembly (3) includes a drive screw (4), a connecting sleeve (5) threaded to the outside of the drive screw (4), and a push rod (6) threaded to the outside of the connecting sleeve (5). The output end of the transmission assembly (2) drives the drive screw (4) to rotate. One end of the push rod (6) away from the drive screw (4) slides through the outlet of the barrel (7). A sliding limit block (57) is fixedly provided on the outside of the connecting sleeve (5), and the sliding limit block (57) slides inside the barrel (7).

2. The electric linear actuator according to claim 1, characterized in that: The connecting sleeve (5) is provided with an abutment ring (51) that abuts against the end of the push rod (6), and the abutment ring (51) is threaded to the outside of the push rod (6).

3. The electric linear actuator according to claim 2, characterized in that: The abutment ring (51) is provided with a positioning groove (511), and the end of the push rod (6) is provided with a positioning part (61) that is embedded in the positioning groove.

4. The electric linear actuator according to claim 1, characterized in that: The outer wall of the connecting threaded sleeve (5) is provided with a positioning protrusion ring (52) and a fixing snap ring (53), and the two ends of the sliding limiting block (57) abut against the positioning protrusion ring (52) and the fixing snap ring (53) respectively.

5. The electric actuator according to claim 4, characterized in that: A stepped groove (54) is provided on the outer side wall of the connecting screw sleeve (5). A stepped ring (571) is provided at the end of the sliding limiting block (57) away from the positioning protrusion ring (52) and is embedded in the stepped groove (54). The fixing snap ring (53) abuts against the stepped ring (571).

6. The electric actuator according to claim 5, characterized in that: The outer wall of the connecting screw sleeve (5) is provided with a snap ring groove (55) for the snap ring (53) to be inserted. The connecting screw sleeve (5) is provided with a relief groove (56). The relief groove (56) is connected to the side of the snap ring groove (55) away from the sliding limit block (57).

7. The electric linear actuator according to claim 1, characterized in that: A sealing rubber ring (71) is provided at the outlet of the barrel (7), and the push rod (6) slides through the sealing rubber ring (71).

8. The electric linear actuator according to claim 1, characterized in that: The transmission assembly (2) is a gear set structure. The end of the drive screw (4) is inserted into the output gear (21) of the gear set structure. The drive screw (4) and the output gear (21) rotate synchronously.

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