Gear replacement convenient linear actuator

Abstract

The utility model discloses a gear replacement convenient linear actuator belongs to electric actuating mechanism technical field, including bottom shell, install the drive motor and actuating mechanism on bottom shell and install the reduction gear assembly in bottom shell, and actuating mechanism includes push rod and is used for driving push rod telescopic screw rod, and reduction gear assembly includes the screw rod gear of installing in the screw rod end and installs motor gear on the output shaft of drive motor, is provided with the limit portion on the output shaft of drive motor, and the connecting column is established on limit portion along the axial direction of the output shaft of drive motor, and connecting column penetrates motor gear, and motor gear is pasted with limit portion, and the locking piece for pressing holds motor gear is installed on connecting column, and the end of output shaft of drive motor is equipped with the rotation stop operating part, the linear actuator of the utility model, has facilitated the user to the disassembly and the new operation of motor gear, and the operation is simple, convenient, and will not cause the damage to motor output shaft, guarantees the normal operation of drive motor.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, and in particular, to a linear actuator with convenient gear replacement. Background Technology

[0002] A linear actuator is a mechanical device that converts the rotary motion output by a motor into telescopic linear motion. It is widely used in industrial automation, robotics, and medical equipment. Its core functions include pushing, pulling, lifting, or positioning objects, with positioning accuracy ranging from micrometers to millimeters. A linear actuator mainly consists of a drive motor, a transmission device, and a linear guide device. The transmission device is often a lead screw mechanism. During operation, the drive motor outputs rotary motion, which is converted into linear motion of the push rod through the lead screw.

[0003] Linear actuators mostly use a drive motor to drive a reduction gear set, converting high-speed rotary motion into low-speed, high-torque linear motion. This reduction design improves the output torque and stability of the push rod, ensuring smooth operation even under heavy loads. The reduction gear set includes a meshing large gear and a small gear. The small gear connects to the output shaft of the drive motor, while the large gear connects to the lead screw. In actual use, because the small gear has relatively fewer teeth, it engages more frequently within the same time frame, resulting in a greater cyclic load on each tooth. Therefore, the small gear is more prone to damage during linear actuator use, requiring regular maintenance and timely replacement of damaged gears. Currently, the small gear and the output shaft of the drive motor typically use an interference fit, making disassembly difficult and replacement inefficient. Furthermore, forcibly pulling the small gear axially can easily damage the motor shaft due to excessive force. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the above-mentioned defects in the prior art, a linear actuator that facilitates quick gear replacement is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a convenient gear-changing linear actuator, including a base shell, a drive motor and an actuator mounted on the base shell, and a reduction gear assembly mounted inside the base shell. The actuator includes a push rod and a lead screw for driving the push rod to extend and retract. The reduction gear assembly includes a lead screw gear mounted on the end of the lead screw and a motor gear mounted on the output shaft of the drive motor. A limiting part is provided on the output shaft of the drive motor. A connecting post is provided on the limiting part along the axial direction of the output shaft of the drive motor. The connecting post passes through the motor gear. The motor gear fits against the limiting part. A locking member for pressing the motor gear is installed on the connecting post. An anti-rotation operating part is provided at the end of the output shaft of the drive motor.

[0006] Furthermore, the limiting part includes a disc and a U-shaped plate connected to the outer circumferential surface of the disc. The disc and the U-shaped plate are coplanar and both are in contact with the motor gear. The connecting column is fixedly connected to the end of the U-shaped plate away from the disc.

[0007] Furthermore, the U-shaped plates are multiple and evenly arranged on the outer circumferential surface of the disk, and a connecting post is provided on each U-shaped plate.

[0008] Furthermore, the disc and the U-shaped plate are integrally formed.

[0009] Furthermore, the connecting post is a stud, a through hole is provided at the edge of the motor gear, the stud passes through the through hole, and the locking element is a nut, which is threadedly connected to the stud.

[0010] Furthermore, the motor gear has a mounting hole at its center, which cooperates with the output shaft of the drive motor, allowing the motor gear to be slidably mounted on the output shaft of the drive motor through the mounting hole.

[0011] Furthermore, the anti-rotation operation part is a through hole or a rectangular block provided at the end of the output shaft of the drive motor.

[0012] Furthermore, the bottom shell includes a mounting box and a cover, the cover being detachably fixedly mounted on the open end of the mounting box, and the reduction gear assembly being disposed within the mounting box.

[0013] Furthermore, the actuator also includes a housing and a slider. The housing is fixedly connected to the mounting box, the slider is slidably disposed inside the housing, the lead screw extends into the housing and is threadedly connected to the slider, and one end of the push rod is fixedly connected to the slider.

[0014] The beneficial effects of this utility model are as follows: Compared with the interference fit connection between the motor gear and the output shaft of the drive motor, the gear replacement-convenient linear actuator of this utility model has a limiting part and a connecting column fixedly set on the output shaft of the drive motor to limit circumferential rotation. The motor gear is locked on the connecting column by a locking part. In use, the user only needs to remove the locking part and can remove the motor gear from the output shaft of the drive motor by sliding operation. This greatly facilitates the user's disassembly and replacement of the motor gear. The operation is simple and convenient, improves the replacement efficiency, and ensures that the output shaft of the drive motor will not be damaged when the motor gear is disassembled, thus ensuring the normal operation of the drive motor. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a perspective view of the convenient gear-replacement linear actuator of this utility model;

[0017] Figure 2 yes Figure 1 The diagram shows a partially exploded view of a gear-changeable linear actuator.

[0018] Figure 3 yes Figure 2 The diagram shows the connection structure between the limiting part and the motor gear in the gear-changeable linear actuator.

[0019] Figure 4 yes Figure 3 A structural diagram from another perspective;

[0020] Figure 5 yes Figure 3 The main view;

[0021] Figure 6 yes Figure 5 Sectional view along AA;

[0022] Figure 7 yes Figure 1 The front view of the gear-changeable linear actuator is shown.

[0023] Figure 8 yes Figure 7 The image shows a cross-sectional view along BB of a gear-changing, convenient linear actuator.

[0024] In the diagram: 1. Bottom shell, 11. Mounting box, 12. Cover, 13. Sealing ring, 2. Drive motor, 21. Limiting part, 211. Disc, 212. U-shaped plate, 22. Connecting column, 210. Anti-rotation operating part, 23. Locking part, 3. Actuator, 31. Push rod, 32. Lead screw, 33. Housing, 34. Slider, 4. Reduction gear assembly, 41. Motor gear, 411. Through hole, 412. Mounting hole, 42. Lead screw gear. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0026] Please see Figures 1-8This utility model provides a convenient gear-changing linear actuator, including a base housing 1, a drive motor 2, an actuator 3, and a reduction gear assembly 4 installed inside the base housing 1. The drive motor 2 and the actuator 3 are both fixedly installed outside the base housing 1. The actuator 3 includes a push rod 31 and a lead screw 32 for driving the push rod 31 to extend or retract. The lead screw 32 is rotatably connected to the base housing 1. The reduction gear assembly 4 includes a motor gear 41 and a lead screw gear 42 that mesh with each other. The diameter of the motor gear 41 is smaller than the diameter of the lead screw gear 42. A set is mounted on the output shaft of the drive motor 2. The lead screw gear 42 is fixedly connected to the lead screw 32. A limit part 21 is provided radially on the output shaft of the drive motor 2. A connecting post 22 is provided on the limit part 21 along the axial direction of the output shaft of the drive motor 2. The connecting post 22 passes through the motor gear 41. The motor gear 41 fits against the limit part 21. A locking member 23 is installed on the end of the connecting post 22 away from the limit part 21. The locking member 23 presses the motor gear 41. An anti-rotation operation part 210 is provided at the end of the output shaft of the drive motor 2.

[0027] This utility model discloses a convenient gear-replacement linear actuator. During operation, the drive motor 2 is started, causing the motor gear 41 to rotate, which in turn drives the lead screw gear 42 to rotate, further driving the lead screw 32 to rotate. The rotation of the lead screw 32 then drives the push rod 31 to perform telescopic movement. After the motor gear 41 is installed in place, the connecting column 22 restricts the circumferential rotation of the motor gear 41 relative to the output shaft of the drive motor 2, and the locking element 23 restricts the axial movement of the motor gear 41 relative to the output shaft of the drive motor 2. Together, these two elements lock the motor gear 41 onto the output shaft of the drive motor 2.

[0028] After a period of use, when the motor gear 41 needs to be replaced due to wear, the output shaft of the drive motor 2 can be restricted to rotate by the anti-rotation operation part 210. Then, the locking member 23 is removed from one end of the connecting column 22. At this time, the locking relationship between the connecting column 22 and the motor gear 41 is released. Next, the motor gear 41 is pulled outward along the axial direction of the connecting column 22, and then the new motor gear 41 is slidably mounted on the output shaft of the drive motor 2 along the axial direction, and the connecting column 22 passes through the motor gear 41. Finally, the locking member 23 is installed on the connecting column 22 to press and fix the motor gear 41 on the limiting part 21.

[0029] Please see Figures 3-6The limiting part 21 is fixedly connected to the output shaft of the drive motor 2. In this embodiment, the limiting part 21 and the output shaft of the drive motor 2 are interference-fitted. The limiting part 21 includes a disc 211 and a U-shaped plate 212 connected to the outer circumferential surface of the disc 211. The U-shaped plate 212 is coplanar with the disc 211. When the motor gear 41 is installed on the output shaft of the drive motor 2, the motor gear 41 simultaneously engages with both the disc 211 and the U-shaped plate 212. The connecting post 22 is fixedly connected to the end of the U-shaped plate 212 away from the disc 211. In addition, the disc 211 and the U-shaped plate 212 are integrally formed, which facilitates processing and also helps control production costs.

[0030] In a preferred embodiment, multiple U-shaped plates 212 are evenly distributed on the outer circumferential surface of the disk 211. Each U-shaped plate 212 has a connecting post 22. The multiple U-shaped plates 212 and their connecting posts 22 increase the connection strength between the connecting post 22 and the motor gear 41, improving the connection stability of the two components. Furthermore, placing the connecting post 22 at the free end of the U-shaped plate 212 (i.e., the end of the U-shaped plate 212 away from the disk 211) enhances the structural strength at the edge of the motor gear 41, effectively preventing easy deformation of the motor gear 41 edge under stress. In one specific embodiment, four U-shaped plates 21 are used.

[0031] In this embodiment, the connecting post 22 is a stud, and a through hole 411 is provided at the edge of the motor gear 41. The through hole 411 is a smooth hole, and the stud passes through the through hole 411. The locking member 23 is a nut, and the nut is threadedly connected to the stud, thereby locking the motor gear 41 onto the limiting part 21.

[0032] Furthermore, the motor gear 41 has a mounting hole 412 at its center, which cooperates with the output shaft of the drive motor 2. During installation, the motor gear 41 can be slidably mounted on the output shaft of the drive motor 2 through the mounting hole 412.

[0033] In this embodiment, the anti-rotation operating part 210 is a through hole provided at the end of the output shaft of the drive motor 2. When the user needs to rotate the locking member 23 during the installation of the motor gear 41, in order to prevent the output shaft of the drive motor 2 from rotating along with it, the user can use a rod-shaped structural member to insert its end into the through hole to restrict the rotation of the output shaft of the drive motor 2, thus facilitating the locking member 23. In other embodiments not shown, the anti-rotation operating part 210 is a rectangular block provided at the end of the output shaft of the drive motor 2. When the user rotates the locking member 23, the rectangular block can be fixed with a wrench or other tools, which can also prevent the output shaft of the drive motor 2 from rotating.

[0034] Please see Figure 2The base shell 1 includes a mounting box 11 and a cover 12. The mounting box 11 is a box-shaped structure with one open end. The cover 12 is detachably fixed to the open end of the mounting box 11 by bolts. The reduction gear assembly 4 is disposed inside the mounting box 11. When the user removes the cover 12, the reduction gear assembly 4 can be exposed, thereby allowing for the disassembly and replacement of the motor gear 41. Furthermore, a sealing ring 13 is sandwiched between the mounting box 11 and the cover 12 to seal and prevent dust, moisture, etc., from entering the interior of the base shell 1, thereby affecting the normal operation of the internal components.

[0035] The drive motor 2 is fixedly mounted on the mounting box 11. The output shaft of the drive motor 2 rotatably passes through the mounting box 11. One end of the lead screw 32 is a smooth section, which rotatably passes through the mounting box 11. The lead screw gear 42 is fixedly mounted on the smooth section. To improve driving stability, bearings are provided between the output shaft of the drive motor 2 and between the lead screw 32 and the mounting box 11. In this embodiment, the lead screw gear 42 and the lead screw 32 are interference-fitted to achieve a fixed connection between them. It is understood that in other embodiments, the lead screw gear 42 and the lead screw 32 can also adopt the same connection method as that between the motor gear 41 and the output shaft of the drive motor 2, so as to facilitate the disassembly and replacement of the damaged lead screw gear 42.

[0036] Please see Figure 8 The actuator 3 also includes a housing 33 and a slider 34. The housing 33 is fixedly connected to the mounting box 11, and the slider 34 is slidably disposed inside the housing 33. The lead screw 32 extends into the housing 33 and is threadedly connected to the slider 34. One end of the push rod 31 is fixedly connected to the slider 34. Thus, when the lead screw 32 rotates, it can drive the slider 34 to slide relative to the housing 33 along the axial direction of the lead screw 32, thereby driving the push rod 31 to move synchronously to achieve telescopic linear motion. In this embodiment, the housing 33 has a cuboid structure, and the slider 34 is a rectangular block, so that the slider 34 can only slide along the length direction of the housing 33 and cannot rotate relative to the housing 33.

[0037] This utility model's convenient gear replacement linear actuator, compared to the interference fit connection between the motor gear 41 and the output shaft of the drive motor 2, has a limiting part 21 and a connecting post 22 fixedly installed on the output shaft of the drive motor 2 to restrict circumferential rotation. A locking part 23 is used to lock the motor gear 41 onto the connecting post 22. In use, the user only needs to remove the locking part 23 to slide the motor gear 41 off the output shaft of the drive motor 2, greatly facilitating the disassembly and replacement of the motor gear 41. The operation is simple and convenient, improving replacement efficiency, and ensuring that the output shaft of the drive motor 2 is not damaged during disassembly of the motor gear 41, thus guaranteeing the normal operation of the drive motor 2.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A convenient linear actuator with gear replacement, comprising a base housing, a drive motor and an actuator mounted on the base housing, and a reduction gear assembly mounted inside the base housing, wherein the actuator includes a push rod and a lead screw for driving the push rod to extend or retract, and the reduction gear assembly includes a lead screw gear mounted on the end of the lead screw and a motor gear mounted on the output shaft of the drive motor, characterized in that: The output shaft of the drive motor is provided with a limiting part, and a connecting post is provided on the limiting part along the axial direction of the output shaft of the drive motor. The connecting post passes through the motor gear, and the motor gear fits against the limiting part. A locking member for pressing the motor gear is installed on the connecting post, and an anti-rotation operating part is provided at the end of the output shaft of the drive motor.

2. The gear-changing convenient linear actuator as described in claim 1, characterized in that: The limiting part includes a disc and a U-shaped plate connected to the outer circumferential surface of the disc. The disc and the U-shaped plate are coplanar and both are in contact with the motor gear. The connecting column is fixedly connected to the end of the U-shaped plate away from the disc.

3. The gear-changing convenient linear actuator as described in claim 2, characterized in that: The U-shaped plates are multiple and evenly arranged on the outer circumference of the disk, and a connecting post is provided on each U-shaped plate.

4. The gear-changing convenient linear actuator as described in claim 2, characterized in that: The disc and the U-shaped plate are integrally formed.

5. The gear-changing convenient linear actuator as described in claim 1, characterized in that: The connecting post is a stud, and a through hole is provided at the edge of the motor gear. The stud passes through the through hole, and the locking element is a nut, which is threadedly connected to the stud.

6. The gear-changing convenient linear actuator as described in claim 1, characterized in that: The motor gear has a mounting hole at its center, which cooperates with the output shaft of the drive motor. The motor gear can be slidably mounted on the output shaft of the drive motor through the mounting hole.

7. The gear-changing convenient linear actuator as described in claim 1, characterized in that: The anti-rotation operating part is a through hole or a rectangular block provided at the end of the output shaft of the drive motor.

8. The gear-changing convenient linear actuator as described in claim 1, characterized in that: The bottom shell includes a mounting box and a cover. The cover is detachably fixedly installed at the opening end of the mounting box, and the reduction gear assembly is disposed inside the mounting box.

9. The gear-changing convenient linear actuator as described in claim 8, characterized in that: The actuator also includes a housing and a slider. The housing is fixedly connected to the mounting box, the slider is slidably disposed inside the housing, the lead screw extends into the housing and is threadedly connected to the slider, and one end of the push rod is fixedly connected to the slider.

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