Small-size heavy-load electric push rod

Abstract

The utility model relates to a small-size heavy-load electric push rod. The utility model comprises a box body, and a driving mechanism, which is arranged on the box body and is used for providing torque; the clutch self-locking mechanism comprises a clutch rotating shaft connected with the output end of the driving mechanism, a first torsional spring rotating shaft connected with the clutch rotating shaft, a torsional spring and a second torsional spring rotating shaft connected with the first torsional spring rotating shaft through the torsional spring, the first torsional spring rotating shaft can drive the torsional spring to rotate, and the second torsional spring rotating shaft can drive the torsional spring to rotate. The second torsion spring rotating shaft is further driven to rotate; the lead screw assembly is connected with the second torsional spring rotating shaft; the inner pipe is arranged in the outer pipe in a sleeved mode, and the inner pipe is connected with the lead screw assembly and is driven by the lead screw assembly to stretch out and draw back in the axial direction. The utility model has the advantages of high precision, good stability, low noise, fast speed, high transmission efficiency, large load and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electromechanical equipment, in particular to a small-volume heavy-load electric push rod. Background Art

[0002] With the continuous advancement of modern industrial technology, electric linear actuators, as an important transmission device, are widely used in various load scenarios. However, traditional electric linear actuators have the following problems:

[0003] In some applications, the electric linear actuator needs to be of a certain size to reduce the floor space it occupies. Traditional electric linear actuators are usually large and heavy, which limits their use in applications with limited space.

[0004] In scenarios where large loads need to be carried, traditional electric linear actuators cannot meet these requirements and are prone to overload or unstable operation.

[0005] When the electric push rod stops moving, there may be problems with position retreat or sliding, affecting safety of use. Summary of the invention

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the problems of the existing electric push rod being large in size, having a limited maximum load of the push rod, and having safety risks.

[0007] In order to solve the above technical problems, the utility model provides a small-volume heavy-duty electric push rod, including a box body and:

[0008] A driving mechanism for providing torque;

[0009] A clutch self-locking mechanism, comprising a clutch shaft connected to the output end of the driving mechanism, a first torsion spring shaft connected to the clutch shaft, a torsion spring, and a second torsion spring shaft connected to the first torsion spring shaft via the torsion spring, wherein the first torsion spring shaft can drive the torsion spring to rotate, thereby driving the second torsion spring shaft to rotate;

[0010] A lead screw assembly connected to the second torsion spring shaft;

[0011] An outer tube and an inner tube sleeved in the outer tube, wherein the inner tube is connected and driven by the lead screw assembly to perform axial expansion and contraction.

[0012] In one embodiment of the utility model, it also includes a torsion spring sleeve installed between the outer tube and the box body, and the outer circle of the torsion spring and the inner circle of the torsion spring sleeve are interference fit.

[0013] In one embodiment of the present utility model, the driving mechanism includes a driving motor, a transmission gear meshed with an output shaft of the driving motor, and a clutch gear meshed with the transmission gear and connected to the clutch shaft.

[0014] In one embodiment of the present utility model, the box body includes a box body lower cover, a box body middle cover and a box body upper cover which are installed in sequence, and the driving motor is installed on the box body upper cover.

[0015] In one embodiment of the present utility model, the screw assembly includes a ball screw connected to the second torsion spring shaft, and a ball nut threadedly connected to the ball screw and connected to the inner tube.

[0016] In one implementation of the utility model, the end of the clutch shaft extends into the hole of the first torsion spring shaft, and the end of the ball screw extends into the hole of the second torsion spring shaft.

[0017] In one embodiment of the utility model, a screw sleeve is threadedly connected to the external thread of the stage of the ball screw, and the outer sleeve of the screw sleeve is provided with a deep groove ball bearing installed in the outer tube, and the screw sleeve is rotatably connected to the deep groove ball bearing.

[0018] In one embodiment of the utility model, a hexagonal cone-end set screw is connected between the screw sleeve and the ball screw.

[0019] In one embodiment of the utility model, a nut guide sleeve which is sleeved on the outside of the ball nut is slidably connected inside the outer tube.

[0020] In one embodiment of the utility model, a joint is installed at the axial outer end of the inner tube, an outer tube end cover is installed at the axial outer end of the outer tube, a dustproof sealing ring and a waterproof sealing ring are arranged between the outer tube end cover and the axial outer end of the inner tube, and a waterproof gasket is arranged between the outer tube end cover and the axial outer end of the outer tube.

[0021] The above technical solution of the utility model has the following advantages compared with the prior art:

[0022] The small-volume heavy-duty electric push rod described in the utility model has a compact overall structure, can achieve efficient operation in a limited space, and is suitable for scenes requiring a small-volume device.

[0023] The utility model adopts a clutch self-locking mechanism, so that when the driving motor stops, the push rod can be automatically locked at the current position, and will not slide or rotate due to load reversal, thereby maintaining stability and safety.

[0024] The utility model adopts a ball screw assembly to perform axial extension and retraction of the push rod, has efficient transmission and precise position control, so that the movement of the push rod is smooth and reliable, ensuring that the push rod has a safer and more stable extension and retraction state during movement; a gear meshing driving mechanism is used to improve efficiency and reduce noise; it has the advantages of high precision, good stability, low noise, high speed, high transmission efficiency, large load, etc., and has a self-locking structure, ensuring that the push rod has a safer and more stable extension and retraction state during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of a small-volume heavy-load electric push rod of the utility model.

[0027] Figure 2 It is a partial structural schematic diagram of a small-volume heavy-load electric push rod of the utility model.

[0028] Description of the Figures in the Specification:

[0029] 1. Box bottom cover; 2. Box middle cover; 3. Box top cover; 4. Motor; 5. Output shaft; 6. Transmission gear; 7. Clutch gear; 8. Clutch shaft; 9a. First torsion spring shaft; 9b. Second torsion spring shaft; 10. Torsion spring; 11. Torsion spring bushing; 12. Ball screw; 13. Screw bushing; 14. Deep groove ball bearing; 15. Ball nut; 16. Inner tube; 17. Joint; 27. Hexagon socket cone end set screw; 30. Outer tube; 32. Waterproof gasket; 33. Outer tube end cover; 34. Waterproof sealing ring; 35. Dustproof sealing ring; 38. Nut guide sleeve. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0031] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0034] Reference Figure 1 , Figure 2 As shown, a small-volume heavy-duty electric push rod of the utility model includes a box body and:

[0035] A driving mechanism for providing torque;

[0036] The clutch self-locking mechanism comprises a clutch shaft 8 connected to the output end of the driving mechanism, a first torsion spring shaft 9a connected to the clutch shaft 8, a torsion spring 10, and a second torsion spring shaft 9b connected to the first torsion spring shaft 9a through the torsion spring 10, wherein the first torsion spring shaft 9a can drive the torsion spring 10 to rotate, thereby driving the second torsion spring shaft 9b to rotate;

[0037] A lead screw assembly connected to the second torsion spring shaft 9b;

[0038] The outer tube 30 and the inner tube 16 sleeved in the outer tube 30, the inner tube 16 is connected and driven by the screw assembly to axially extend and retract.

[0039] Specifically, it also includes a torsion spring sleeve 11 installed between the outer tube 30 and the box body, and the outer circle of the torsion spring 10 and the inner circle of the torsion spring sleeve 11 are interference fit.

[0040] Specifically, the driving mechanism includes a driving motor 4, a transmission gear 6 meshed with an output shaft 5 (driving gear) of the driving motor 4, and a clutch gear 7 meshed with the transmission gear 6 and connected to the clutch shaft 8. The above gear sets constitute a reduction system in the gearbox. The output shaft 5 of the driving motor 4 is reduced in speed and output to the transmission gear 6, and drives the transmission gear 6 to rotate. The transmission gear 6 meshes with the clutch gear 7 and drives the clutch gear 7 to rotate together. In this embodiment, the clutch gear 7 has a torque protection function to play a protective role when the transmission torque exceeds the rated torque of the clutch gear 7.

[0041] In some embodiments, the box body includes a box body lower cover 1, a box body middle cover 2 and a box body upper cover 3 which are installed in sequence, and the driving motor 4 is installed on the box body upper cover 3.

[0042] In some embodiments, the screw assembly includes a ball screw 12 connected to the second torsion spring shaft 9 b , and a ball nut 15 threadedly connected to the ball screw 12 and connected to the inner tube 16 .

[0043] It is understood that, in operation, the ball nut 15 engages the ball screw and moves in the axial direction along the ball screw under the support of the guide part, thereby converting the rotational torque of the ball screw into a linear thrust. The linear thrust is transmitted from the ball nut 15 to the inner tube 16 and to the front end.

[0044] Specifically, the end of the clutch shaft 8 extends into the hole of the first torsion spring shaft 9a, and the end of the ball screw 12 extends into the hole of the second torsion spring shaft 9b; a screw sleeve 13 is threadedly connected to the external thread of the stage of the ball screw 12, and the outer sleeve of the screw sleeve 13 is provided with a deep groove ball bearing 14 installed in the outer tube 30, and the screw sleeve 13 is rotatably connected to the deep groove ball bearing 14; a hexagonal cone-end set screw is connected between the screw sleeve 13 and the ball screw 12.

[0045] Specifically, a nut guide sleeve 38 is slidably connected inside the outer tube 30 and is sleeved on the outside of the ball nut 15. The nut guide sleeve 38 is made of plastic. The ball nut 15 is fixedly connected to the nut guide sleeve 38. When the ball screw rotates, the ball nut 15 is restricted to rotate together with the ball screw.

[0046] Specifically, a joint 17 is installed at the axial outer end of the inner tube 16. The rotation of the ball screw causes the ball nut 15 to make linear motion in the axial direction along the ball screw. The ball nut 15 cooperates with the outer tube 30 and slidingly engages the corresponding inner surface contour of the outer tube 30 through the nut guide sleeve 38, so that the inner tube 16 fixed on the ball nut 15 is correspondingly expanded and contracted in the axial direction, and the inner tube 16 then transmits the expansion and contraction motion to the front end joint 17.

[0047] Specifically, an outer tube end cap 33 is installed at the axial outer end of the outer tube 30, a dustproof seal ring 35 and a waterproof seal ring 34 are arranged between the outer tube end cap 33 and the axial outer end of the inner tube 16, and a waterproof gasket 32 ​​is arranged between the outer tube end cap 33 and the axial outer end of the outer tube 30. The design of the outer tube end cap 33, the dustproof seal ring 35, the waterproof seal ring 34, and the waterproof gasket 32 ​​effectively prevents external dust, moisture and other substances from entering the interior, protects the mechanism from being affected by the external environment, prolongs the service life, and can operate in some relatively harsh environmental conditions, such as salt spray environment, high temperature environment, low temperature environment, etc.

[0048] When working, the driving motor 4 transmits the torque to the transmission gear 6 through the driving gear of the output shaft 5, the transmission gear 6 transmits the torque to the clutch gear 7, the clutch gear 7 transmits the torque to the clutch shaft 8, one end of the clutch shaft 8 transmits the torque to the first torsion spring shaft 9a, the torsion spring shaft 10 transmits the torque to the second torsion spring shaft 9b through the torsion spring 10, the torsion spring 10 shaft is connected to the ball screw 12, and finally transmits the torque to the ball screw 12. The outer circle of the torsion spring 10 and the inner circle of the torsion spring sleeve 11 are interference fit. When the driving motor 4 is powered on and started, the first torsion spring shaft 9a drives the torsion spring 10 to rotate When the torsion spring 10 is in a state of expansion, the torsion spring 10 slides in the torsion spring sleeve 11, and at the same time drives the second torsion spring shaft 9b to rotate and drives the ball screw 12 to rotate, thereby forming the extension and retraction of the push rod. When the drive motor 4 is turned off, the load of the push rod will give the ball screw 12 a reverse driving torque. The reverse driving torque causes the torsion spring 10 to be subjected to an expansion force, thereby increasing the friction between the torsion spring 10 and the torsion spring sleeve 11. The friction torque between the torsion spring 10 and the torsion spring sleeve 11 is greater than the reverse torque of the ball screw 12, so the ball screw 12 can be kept from rotating in the opposite direction, and the position of the ball screw 12 can be kept to form a self-locking state.

[0049] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A small-volume heavy-duty electric linear actuator, characterized in that: It includes a box and the following items installed on the box: A driving mechanism for providing torque; A clutch self-locking mechanism, comprising a clutch rotating shaft (8) connected to the output end of the driving mechanism, a first torsion spring rotating shaft (9a) connected to the clutch rotating shaft (8), a torsion spring (10), and a second torsion spring rotating shaft (9b) connected to the first torsion spring rotating shaft (9a) via the torsion spring (10), wherein the first torsion spring rotating shaft (9a) can drive the torsion spring (10) to rotate, thereby driving the second torsion spring rotating shaft (9b) to rotate; A lead screw assembly connected to the second torsion spring rotating shaft (9b); An outer tube (30) and an inner tube (16) sleeved inside the outer tube (30), wherein the inner tube (16) is connected and axially retracted by being driven by the lead screw assembly.

2. A small-volume heavy-load electric linear actuator according to claim 1, characterized in that: It also includes a torsion spring sleeve (11) installed between the outer tube (30) and the box body, and the outer circle of the torsion spring (10) and the inner circle of the torsion spring sleeve (11) are interference fit.

3. The small-volume heavy-load electric linear actuator according to claim 1, characterized in that: The driving mechanism comprises a driving motor (4), a transmission gear (6) meshing with an output shaft (5) of the driving motor (4), and a clutch gear (7) meshing with the transmission gear (6) and connected to the clutch rotating shaft (8).

4. The small-volume heavy-load electric linear actuator according to claim 3, characterized in that: The box body comprises a box body lower cover (1), a box body middle cover (2) and a box body upper cover (3) which are installed in sequence, and the driving motor (4) is installed on the box body upper cover (3).

5. The small-volume heavy-load electric linear actuator according to claim 1, characterized in that: The screw assembly comprises a ball screw (12) connected to the second torsion spring rotating shaft (9b), and a ball nut (15) threadedly connected to the ball screw (12) and connected to the inner tube (16).

6. The small-volume heavy-load electric linear actuator according to claim 5, characterized in that: The end of the clutch rotating shaft (8) extends into the hole of the first torsion spring rotating shaft (9a), and the end of the ball screw (12) extends into the hole of the second torsion spring rotating shaft (9b).

7. The small-volume heavy-load electric linear actuator according to claim 5, characterized in that: A screw sleeve (13) is threadedly connected to the external thread of the stage of the ball screw (12); a deep groove ball bearing (14) is provided on the outer sleeve of the screw sleeve (13) and is installed in the outer tube (30); the screw sleeve (13) is rotatably connected to the deep groove ball bearing (14).

8. The small-volume heavy-load electric linear actuator according to claim 7, characterized in that: A hexagonal cone-end set screw is connected between the screw shaft sleeve (13) and the ball screw (12).

9. The small-volume heavy-load electric linear actuator according to claim 5, characterized in that: A nut guide sleeve (38) sleeved on the outside of the ball nut (15) is slidably connected inside the outer tube (30).

10. The small-volume heavy-load electric linear actuator according to claim 1, characterized in that: A joint (17) is installed at the axial outer end of the inner tube (16), an outer tube end cover (33) is installed at the axial outer end of the outer tube (30), a dustproof sealing ring (35) and a waterproof sealing ring (34) are arranged between the outer tube end cover (33) and the axial outer end of the inner tube (16), and a waterproof gasket (32) is arranged between the outer tube end cover (33) and the axial outer end of the outer tube (30).

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