Small-size electric actuator

Abstract

The utility model relates to a small-size electric actuator. The small-size electric actuator comprises a driving motor, a small synchronous belt pulley connected with the driving motor, a large synchronous belt pulley connected with the small synchronous belt pulley, a ball screw connected with the large synchronous belt pulley, and a screw nut connected with the ball screw, the output guide sleeve is connected with the lead screw nut; the output connecting block is connected with the output guide sleeve; the driving motor is used for driving the small synchronous belt pulley to rotate, the small synchronous belt pulley is used for driving the large synchronous belt pulley to rotate through a synchronous belt, the large synchronous belt pulley is used for driving the ball screw to rotate, and the ball screw is used for driving the lead screw nut to move linearly. The lead screw nut is used for driving the output guide sleeve to move linearly, and the output guide sleeve is used for driving the output connecting block to move linearly. The small-size electric actuator is simple in structure, small in occupied space and low in production and manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, and in particular to a small-volume electric actuator. Background Technology

[0002] An electric actuator is a device that converts the rotary motion of a motor into linear motion and is widely used in automated control systems. Most electric actuators on the market are assembled from components such as a drive motor, reduction gearbox, synchronous pulley assembly, ball screw and nut assembly, push rod, spherical bearing, mounting base housing, and dustproof shell. They have a relatively complex structure, occupy a large space, and have high manufacturing costs. Utility Model Content

[0003] Therefore, it is necessary to provide a smaller electric actuator to address the problems of existing electric actuators having complex structures, large space requirements, and high manufacturing costs.

[0004] The small-volume electric actuator includes a drive motor, a small synchronous pulley connected to the drive motor, a large synchronous pulley connected to the small synchronous pulley, a ball screw connected to the large synchronous pulley, a screw nut connected to the ball screw, an output guide sleeve connected to the screw nut, and an output connecting block connected to the output guide sleeve.

[0005] The drive motor is used to drive the small synchronous pulley to rotate, the small synchronous pulley is used to drive the large synchronous pulley to rotate via the synchronous belt, the large synchronous pulley is used to drive the ball screw to rotate, the ball screw is used to drive the screw nut to move linearly, the screw nut is used to drive the output guide sleeve to move linearly, and the output guide sleeve is used to drive the output connecting block to move linearly.

[0006] When the aforementioned small-volume electric actuator is working, the drive motor drives a small synchronous pulley to rotate, which in turn drives a large synchronous pulley via a synchronous belt. The large synchronous pulley then drives a ball screw to rotate. The ball screw is threadedly connected to a screw nut, and its rotation causes the screw nut to move linearly relative to the ball screw. The screw nut is fixedly connected to an output guide sleeve, and its linear movement drives the output guide sleeve to move linearly. The output connecting block is fixedly connected to the output guide sleeve, and its linear movement drives the output connecting block to move linearly. This converts the rotational motion of the drive motor into the linear motion of the output connecting block. It can be seen that this small-volume electric actuator has a simple structure, occupies little space, and has low manufacturing costs, making it a promising candidate for market applications.

[0007] In one embodiment, the drive motor is connected to the small synchronous pulley via a resilient cylindrical pin;

[0008] The drive motor includes an output shaft, the output shaft having a first through hole that engages with the elastic cylindrical pin, and the small synchronous pulley having a connecting part having a second through hole that engages with the elastic cylindrical pin.

[0009] In one embodiment, the large synchronous pulley is connected to the ball screw via an A-key, the ball screw has a first keyway that engages with the A-key, and the large synchronous pulley has a second keyway that engages with the A-key.

[0010] In one embodiment, a first screw is connected to one end of the ball screw facing the large synchronous pulley, the first screw including a head and a screw rod;

[0011] The large synchronous pulley is provided with a support platform that matches the nail head, and a washer is provided between the nail head and the support platform. The ball screw is provided with a screw hole that matches the screw rod.

[0012] In one embodiment, a first ball bearing is installed at the end of the ball screw near the large synchronous pulley, and a second ball bearing is installed at the end away from the large synchronous pulley.

[0013] In one embodiment, the small-volume electric actuator further includes a first fixed plate and a second fixed plate, wherein the first ball bearing is mounted on the first fixed plate and the second ball bearing is mounted on the second fixed plate.

[0014] In one embodiment, the first fixing plate and the second fixing plate are fixedly connected by a second screw, and a support rod is sleeved on the outside of the second screw.

[0015] In one embodiment, the small-volume electric actuator further includes a protective plate, which is fixedly connected to the first fixed plate and the second fixed plate respectively.

[0016] In one embodiment, the drive motor is fixedly mounted on the first fixing plate.

[0017] In one embodiment, the output connection block is mounted on the output guide sleeve via a shaft snap ring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a partial mating structure of the small-volume electric actuator of this utility model;

[0019] Figure 2 This is a schematic diagram of the cooperation structure between the small synchronous belt pulley and the drive motor in the small-volume electric actuator of this utility model;

[0020] Figure 3 This is a schematic diagram of the drive motor in the small-volume electric actuator of this utility model;

[0021] Figure 4 This is a schematic diagram of the small synchronous belt pulley in the small-volume electric actuator of this utility model;

[0022] Figure 5 This is a schematic diagram of the ball screw structure in the small-volume electric actuator of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the large synchronous belt pulley in the small-volume electric actuator of this utility model;

[0024] Figure 7 This is a schematic diagram of another partial assembly structure of the small-volume electric actuator of this utility model;

[0025] Figure 8 This is a schematic diagram of the overall structure of the small-volume electric actuator of this utility model;

[0026] Figure 9 This is a schematic diagram of the A-type key in the small-volume electric actuator of this utility model;

[0027] Among them, 10 is the drive motor, 20 is the small synchronous pulley, 30 is the large synchronous pulley, 40 is the ball screw, 50 is the screw nut, 60 is the output guide sleeve, 70 is the output connecting block, 80 is the synchronous belt, 90 is the elastic cylindrical pin, 11 is the output shaft, 111 is the first through hole, 12 is the first fixing plate, 13 is the second fixing plate, 14 is the second screw, 15 is the support rod, 16 is the protective plate, 21 is the connecting part, 211 is the second through hole, 31 is the A-type key, 32 is the second keyway, 33 is the first screw, 34 is the support platform, 35 is the washer, 41 is the first keyway, 42 is the screw hole, 43 is the first ball bearing, 44 is the second ball bearing, and 71 is the shaft retaining ring. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] This utility model discloses a small-volume electric actuator.

[0032] like Figures 1 to 9 As shown, the small-volume electric actuator includes a drive motor 10, a small synchronous pulley 20 connected to the drive motor 10, a large synchronous pulley 30 connected to the small synchronous pulley 20, a ball screw 40 connected to the large synchronous pulley 30, a screw nut 50 connected to the ball screw 40, an output guide sleeve 60 connected to the screw nut 50, and an output connecting block 70 connected to the output guide sleeve 60.

[0033] The drive motor 10 is used to drive the small synchronous pulley 20 to rotate. The small synchronous pulley 20 is used to drive the large synchronous pulley 30 to rotate via the synchronous belt 80. The large synchronous pulley 30 is used to drive the ball screw 40 to rotate. The ball screw 40 is used to drive the screw nut 50 to move linearly. The screw nut 50 is used to drive the output guide sleeve 60 to move linearly. The output guide sleeve 60 is used to drive the output connecting block 70 to move linearly.

[0034] When the aforementioned small-volume electric actuator is working, the drive motor drives a small synchronous pulley to rotate, which in turn drives a large synchronous pulley via a synchronous belt. The large synchronous pulley then drives a ball screw to rotate. The ball screw is threadedly connected to a screw nut, and its rotation causes the screw nut to move linearly relative to the ball screw. The screw nut is fixedly connected to an output guide sleeve, and its linear movement drives the output guide sleeve to move linearly. The output connecting block is fixedly connected to the output guide sleeve, and its linear movement drives the output connecting block to move linearly. This converts the rotational motion of the drive motor into the linear motion of the output connecting block. It can be seen that this small-volume electric actuator has a simple structure, occupies little space, and has low manufacturing costs, making it a promising candidate for market applications.

[0035] The drive motor 10 is connected to the small synchronous pulley 20 via a flexible cylindrical pin 90. The drive motor 10 includes an output shaft 11, which has a first through hole 111 that engages with the flexible cylindrical pin 90. The small synchronous pulley 20 has a connecting part 21, which has a second through hole 211 that engages with the flexible cylindrical pin 90. When this small-volume electric actuator is working, the first through hole 111 and the second through hole 211 are aligned, and the flexible cylindrical pin 90 is inserted into both the first through hole 111 and the second through hole 211. By using the flexible cylindrical pin 90, the small synchronous pulley 20 and the output shaft 11 can rotate synchronously.

[0036] The large synchronous pulley 30 is connected to the ball screw 40 via a type A key 31. The ball screw 40 has a first keyway 41 that mates with the type A key 31, and the large synchronous pulley 30 has a second keyway 32 that mates with the type A key 31. When this small-volume electric actuator is working, the type A key 31 is simultaneously engaged in both the first keyway 41 and the second keyway 32. By setting the type A key 31, the ball screw 40 and the large synchronous pulley 30 can rotate synchronously.

[0037] Furthermore, the inner diameter of the small synchronous pulley 20 is smaller than that of the large synchronous pulley 30. The small synchronous pulley 20 drives the large synchronous pulley 30 to rotate via the synchronous belt 80, which can achieve power transmission with reduced speed and increased torque.

[0038] Furthermore, a first screw 33 is connected to one end of the ball screw 40 facing the large synchronous pulley 30. The first screw 33 includes a screw head 331 and a screw rod 332. The large synchronous pulley 30 is provided with a support platform 34 that mates with the screw head 331. A washer 35 is provided between the screw head 331 and the support platform 34. The ball screw 40 is provided with a screw hole 42 that mates with the screw rod 332. Through the mutual cooperation of the first screw 33, the support platform 34 and the washer 35, the smooth rotation of the ball screw 40 can be achieved.

[0039] The ball screw 40 has a first ball bearing 43 installed at the end closest to the large synchronous pulley 30, and a second ball bearing 44 installed at the end furthest from the large synchronous pulley 30. The cooperation of the first ball bearing 43 and the second ball bearing 44 reduces the friction generated during the rotation of the ball screw 40, thereby reducing wear and extending its service life.

[0040] Furthermore, this small-volume electric actuator also includes a first fixed plate 12 and a second fixed plate 13. A first ball bearing 43 is mounted on the first fixed plate 12, and a second ball bearing 44 is mounted on the second fixed plate 13. Mounting the first ball bearing 43 on both the first and second fixed plates 12 and 13 makes the mounting of the first ball bearing 43 more secure and also helps to improve the stability of the ball screw 40 during rotation.

[0041] Furthermore, the first fixing plate 12 and the second fixing plate 13 are fixedly connected by a second screw 14, and a support rod 15 is sleeved on the outside of the second screw 14. By fixing the first fixing plate 12 and the second fixing plate 13 together, the overall structure of this small-volume electric actuator is made more stable.

[0042] The small-volume electric actuator also includes a protective plate 16, which is fixedly connected to the first fixed plate 12 and the second fixed plate 13. The protective plate 16 can be positioned close to the small synchronous pulley 20 and the large synchronous pulley 30. By setting the protective plate 16, the small-volume electric actuator can minimize interference with the external environment during operation and improve its safety.

[0043] Furthermore, the drive motor 10 is fixedly mounted on the first fixing plate 12. By fixing the drive motor 10 to the first fixing plate 12, the drive motor 10 is less likely to generate noise during operation.

[0044] Furthermore, the output connecting block 70 is mounted on the output guide sleeve 60 via a shaft retaining ring 71. By using the shaft retaining ring 71, the output connecting block 70 can move linearly synchronously with the output guide sleeve 60. The shaft retaining ring 71 offers advantages such as easy installation and high reliability.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A small-volume electric actuator, characterized in that, It includes a drive motor, a small synchronous pulley connected to the drive motor, a large synchronous pulley connected to the small synchronous pulley, a ball screw connected to the large synchronous pulley, a screw nut connected to the ball screw, an output guide sleeve connected to the screw nut, and an output connecting block connected to the output guide sleeve. The drive motor is used to drive the small synchronous pulley to rotate, the small synchronous pulley is used to drive the large synchronous pulley to rotate via the synchronous belt, the large synchronous pulley is used to drive the ball screw to rotate, the ball screw is used to drive the screw nut to move linearly, the screw nut is used to drive the output guide sleeve to move linearly, and the output guide sleeve is used to drive the output connecting block to move linearly.

2. The small-volume electric actuator according to claim 1, characterized in that, The drive motor is connected to the small synchronous belt pulley via a flexible cylindrical pin; The drive motor includes an output shaft, the output shaft having a first through hole that engages with the elastic cylindrical pin, and the small synchronous pulley having a connecting part having a second through hole that engages with the elastic cylindrical pin.

3. The small-volume electric actuator according to claim 2, characterized in that, The large synchronous pulley is connected to the ball screw via a type A key. The ball screw has a first keyway that matches the type A key, and the large synchronous pulley has a second keyway that matches the type A key.

4. The small-volume electric actuator according to claim 3, characterized in that, The end of the ball screw facing the large synchronous pulley is connected to a first screw, which includes a head and a screw rod. The large synchronous pulley is provided with a support platform that matches the nail head, and a washer is provided between the nail head and the support platform. The ball screw is provided with a screw hole that matches the screw rod.

5. The small-volume electric actuator according to any one of claims 1 to 4, characterized in that, The ball screw is equipped with a first ball bearing at the end closest to the large synchronous pulley and a second ball bearing at the end furthest from the large synchronous pulley.

6. The small-volume electric actuator according to claim 5, characterized in that, It also includes a first fixing plate and a second fixing plate, wherein the first ball bearing is mounted on the first fixing plate and the second ball bearing is mounted on the second fixing plate.

7. The small-volume electric actuator according to claim 6, characterized in that, The first fixing plate and the second fixing plate are fixedly connected by a second screw, and a support rod is sleeved on the outside of the second screw.

8. The small-volume electric actuator according to claim 7, characterized in that, It also includes a protective plate, which is fixedly connected to the first fixing plate and the second fixing plate respectively.

9. The small-volume electric actuator according to claim 8, characterized in that, The drive motor is fixedly mounted on the first fixing plate.

10. The small-volume electric actuator according to claim 1, characterized in that, The output connecting block is mounted on the output guide sleeve via a shaft snap ring.

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