A miniature electric push rod

Abstract

The utility model discloses a kind of micro electric push rod, belong to electric push rod technical field.Aiming at the problem that push rod axial length is prone to be too long in prior art, the micro electric push rod of the utility model substantially shortens push rod axial dimension, and the motion stroke of significant growth is realized in micro volume by reverse type structure, and the installation limit of small space is broken through.Axial multilayer buffer gasket group synergistic effect makes motor locked-rotor transmission system flexible stop instead of mechanical sudden stop, substantially reduces gear impact wear and circuit load peak value.Ladder type support and high-precision bearing buffer design significantly improve structural rigidity, effectively prolong the service life of reduction gearbox and motor.PCB current detection module realizes overload automatic protection, explosion-proof surface and seal glue space meet stringent protection requirements, compatible with battery and other low-voltage power supply, substantially expand the reliability and applicability of micro device in complex environment.

Description

Technical Field

[0001] This utility model belongs to the field of electric linear actuator technology, specifically relating to a miniature electric linear actuator. Background Technology

[0002] In existing technologies, traditional actuators are mostly driven by cylinders. To achieve a larger stroke, the axial length needs to be increased, and an air source and oil circuit are also required, resulting in an excessively large size that is difficult to meet the installation requirements of micro-devices or confined spaces. In particular, cylindrical actuators need to balance strength and internal limiting structures, resulting in high design complexity. Existing technologies cannot achieve large stroke and high reliability while maintaining a short size, which severely restricts the application of actuators in micro-precision devices.

[0003] This invention attempts to solve or at least alleviate the problem of the difficulty in balancing the stroke and axial length of a push rod by providing a miniature electric push rod using a motor. Utility Model Content

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, this utility model provides a miniature electric actuator with the advantages of short axial length and long stroke.

[0005] To achieve the above objectives, this utility model provides a miniature electric push rod, including an outer tube and a push rod base, a motor sleeve, and a planetary reducer sequentially arranged inside it from the outside to the inside. The front end of the planetary reducer is sequentially provided with a bearing, a drive shaft, a lead screw, and a telescopic rod.

[0006] The inner wall of the telescopic rod is threaded, forming a reverse structure with the lead screw plate for lead screw and nut transmission; the motor sleeve is a stepped tower-type support structure.

[0007] As an improvement of this utility model, the motor is electrically connected to an external PCB current controller. The PCB current controller includes a potting tube arranged from the outside to the inside, a wire running through the potting tube, a potting area between the wire and the potting tube, potting baffles at both ends of the potting tube, and retaining rings for holes on the outer side of the potting baffles. The wire is connected in series with the PCB board within the potting area.

[0008] As an improvement of this utility model, a glue-filling tube fixing plate is provided on the outside of the glue-filling tube, and a screw hole is provided on the glue-filling tube fixing plate.

[0009] As an improvement of this utility model, the telescopic rod is provided with a guide sleeve, the guide sleeve is provided with a top radial explosion-proof surface, and the push rod base is provided with a bottom sealing space.

[0010] As an improvement of this utility model, the motor sleeve is provided with an adapter sleeve to form a stepped rigid support.

[0011] As an improvement of this utility model, the bearing is provided with bearing buffer pads and bearing retaining rings on both sides, which absorb axial impact force through elastic deformation to achieve flexible stall.

[0012] As an improvement of this utility model, a rectangular groove is provided at the connection end between the transmission shaft and the lead screw, and a tangent is provided on the motor output shaft, so that the two mesh to transmit torque.

[0013] As an improvement of this utility model, the telescopic rod is also provided with a skeleton oil seal, and the bottom of the telescopic rod is provided with a bottom buffer pad, which works in conjunction with the bearing buffer pad to achieve bidirectional flexible stopping.

[0014] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0015] This invention relates to a miniature electric actuator that significantly reduces the axial dimension of the actuator and achieves a significantly increased stroke within a miniature volume through a reverse structure, overcoming the limitations of small-space installation. The synergistic effect of multiple axial buffer pads ensures a flexible stop of the transmission system in the event of motor stall, rather than a sudden mechanical stop, significantly reducing gear impact wear and peak circuit load. The stepped support and high-precision bearing buffer design significantly improve structural rigidity, effectively extending the lifespan of the gearbox and motor. A PCB current detection module sets an upper current threshold for automatic overload protection. The explosion-proof surface and encapsulation space meet stringent protection requirements, and the device is compatible with low-voltage power supplies such as batteries, greatly expanding the reliability and applicability of the miniature device in complex environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the retracted state of a miniature electric push rod according to this utility model;

[0017] Figure 2 This is an exploded view of a miniature electric actuator according to the present invention.

[0018] Figure 3 This is a schematic diagram of the planetary reducer structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the installation of the outer tube sealing ring of this utility model;

[0020] Figure 5 This is a schematic diagram of the installation of the guide sleeve sealing ring of this utility model;

[0021] Figure 6 This is a schematic diagram of the PCB current controller of this utility model;

[0022] Figure 7 This is a schematic cross-sectional view of the PCB current controller of this utility model;

[0023] Figure 8 This is a schematic diagram showing the connection between the electric actuator and the PCB current controller of this utility model.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0025] 1. Outer tube; 2. Telescopic rod; 3. Skeleton oil seal; 4. Guide sleeve; 5. Hole bottom buffer pad; 6. Lead screw plate; 7. Drive shaft; 8. Bearing retaining ring; 9. Stainless steel thin gasket; 10. Bearing buffer pad; 11. Bearing; 12. Planetary reducer; 121. Motor; 13. Motor sleeve; 14. Adapter sleeve; 15. Push rod base; 16. Outer tube sealing ring; 17. Guide sleeve sealing ring; 18. PCB current controller; 181. Hole retaining ring; 182. Glue potting baffle; 183. Glue potting tube; 184. PCB board; 185. Glue potting tube fixing plate; 186. Glue potting area; 187. Wire. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0028] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0029] In the embodiments, by Figure 1-8 A miniature electric actuator is provided, comprising an outer tube 1 and, inside which, sequentially arranged from the outside to the inside, an actuator base 15, a motor sleeve 13, and a planetary reducer 12. The front end of the planetary reducer 12 is sequentially provided with a bearing 11, a drive shaft 7, a lead screw 6, and a telescopic rod 2. The inner wall of the telescopic rod 2 is threaded, forming a reverse structure with the lead screw 6 for lead screw-nut transmission. The motor sleeve 13 is a stepped, tower-shaped support structure. Through the reverse arrangement of the telescopic rod 2 encased in the motor sleeve 13 and the stepped support, the axial dimension is significantly shortened; the threaded pair between the lead screw 6 and the telescopic rod 2 achieves precise linear motion.

[0030] In a preferred embodiment of this utility model, the motor 121 is electrically connected to an external PCB current controller 18. The PCB current controller 18 includes a potting tube 183 arranged from the outside to the inside, and a wire 187 passing through the potting tube 183. A potting area 186 is formed between the wire 187 and the potting tube 183. Potting baffles 182 are provided at both ends of the potting tube, and retaining rings 181 for holes are provided on the outer side of each potting baffle 182. The wire 187 is connected in series with a PCB board 184 within the potting area 186. Epoxy resin electronic adhesive is poured into the potting area 186, and the electronic adhesive covers the PCB board, which is beneficial for heat dissipation of electronic components. The electronic controller significantly improves overload response speed, has explosion-proof function, and greatly enhances protection.

[0031] In a preferred embodiment of this utility model, a glue-potting tube fixing plate 185 is provided on the outer side of the glue-potting tube 183, and the glue-potting tube fixing plate 185 is provided with screw holes. The glue-potting tube fixing plate 185 facilitates the installation and fixing of the PCB current controller 18.

[0032] In a preferred embodiment of this invention, the telescopic rod 2 is fitted with a guide sleeve 4, the guide sleeve 4 having a top radial explosion-proof surface, and the push rod base 15 having a bottom sealing space. The explosion-proof surface blocks the explosion propagation path, and the bottom sealing space achieves a permanent seal, significantly improving the safety of flammable and explosive environments.

[0033] In a preferred embodiment of this invention, an adapter sleeve 14 is fitted over the motor sleeve 13 to form a stepped rigid support. The adapter sleeve 14 bridges the motor sleeve 13 and the planetary reducer 12, forming a three-stage tower-type coupling structure, which significantly enhances the coaxiality and bending stiffness of the transmission system.

[0034] In a preferred embodiment of this invention, bearing buffer pads 10 and bearing retaining rings 8 are provided on both sides of the bearing 11, which absorb axial impact force through elastic deformation to achieve flexible stall. The elastic deformation of the bearing buffer pads 10, together with the bearing retaining rings 8, forms a mechanical buffer layer, which attenuates the impact force on the gears when the motor stalls.

[0035] In a preferred embodiment of this invention, a rectangular groove is formed at the connection end between the drive shaft 7 and the lead screw, and a tangent is provided on the motor output shaft. The two mesh to transmit torque. The non-circular fit between the rectangular groove and the tangent eliminates transmission backlash, ensuring improved torque transmission efficiency from the planetary reducer 12 to the drive shaft 7.

[0036] As a preferred embodiment of this utility model, the telescopic rod 2 is further provided with a skeleton oil seal 3, and a bottom buffer pad 5 is provided at the bottom of the telescopic rod 2, which works in conjunction with the bearing buffer pad 10 to achieve bidirectional flexible stopping. The bottom buffer pad 5 absorbs the mechanical impact at the end of the telescopic rod 2, and forms a bidirectional energy absorption closed loop with the bearing buffer pad 10, simultaneously reducing gear wear and peak circuit load.

[0037] Working Principle: In use, the motor 121 is connected in series with the PCB current controller 18 and an external DC power supply. The DC current enters the limit current detection section through the connection part, and the current is monitored by the PCB board 184. When the motor stalls (the telescopic rod 2 is pushed / retracted to its limit), the current rises to the preset value, and the control board cuts off the circuit. The motor outputs power to the transmission shaft 7 through the planetary reducer 12. The cut edge of the shaft end meshes with the lead screw 7 with a rectangular slot to transmit torque. The lead screw 7 drives the lead screw plate 6 to rotate, which engages with the internal thread of the telescopic rod 2 to convert the rotational motion into axial linear motion. The bearing 11 absorbs the impact force through the elastic deformation of the double-sided bearing buffer pads 10, and together with the bearing retaining ring 8, it achieves stepped buffering, so that the transmission system can stop flexibly when stalled. The bottom buffer pad 5 and the guide sleeve 4 cooperate to further attenuate the end impact. The stepped tower-shaped support structure of the motor sleeve 13 enhances rigidity, and the explosion-proof surface of the guide sleeve 4 and the sealing space of the push rod base 15 meet the explosion-proof requirements.

[0038] In summary, this utility model's miniature electric actuator significantly reduces the axial dimension of the actuator and achieves a significantly increased stroke within a miniature volume through a reverse structure, overcoming the limitations of small-space installation. The synergistic effect of the multi-layered axial buffer pads ensures a flexible stop of the transmission system when the motor stalls, rather than a sudden mechanical stop, greatly reducing gear impact wear and peak circuit load. The stepped support and high-precision bearing buffer design significantly improve structural rigidity, effectively extending the lifespan of the gearbox and motor. The PCB current detection module sets an upper current threshold for automatic overload protection; the explosion-proof surface and encapsulation space meet stringent protection requirements; it is compatible with low-voltage power supplies such as batteries, greatly expanding the reliability and applicability of the miniature device in complex environments.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature electric linear actuator, characterized in that: It includes an outer tube (1) and a push rod base (15), a motor sleeve (13), and a planetary reducer (12) that are sequentially fitted inside it from the outside to the inside. The front end of the planetary reducer (12) is provided with a bearing (11), a transmission shaft (7), a lead screw (6), and a telescopic rod (2). The inner wall of the telescopic rod (2) is threaded, forming a reverse structure of screw nut transmission with the screw plate (6); the motor sleeve (13) is a stepped tower-type support structure.

2. The push rod according to claim 1, characterized in that... The motor (121) is electrically connected to an external PCB current controller (18). The PCB current controller (18) includes a potting tube (183) arranged from the outside to the inside and a wire (187) arranged through the potting tube (183). There is a potting area (186) between the wire (187) and the potting tube (183). Potting baffles (182) are provided at both ends of the potting tube. Hole retaining rings (181) are provided on the outside of the potting baffles (182). The wire (187) is connected in series with the PCB board (184) in the potting area (186).

3. The push rod according to claim 2, characterized in that: A glue-filling tube fixing plate (185) is provided on the outside of the glue-filling tube (183), and a screw hole is provided on the glue-filling tube fixing plate (185).

4. The push rod according to claim 1, characterized in that: The telescopic rod (2) is covered with a guide sleeve (4), the guide sleeve (4) has a top radial explosion-proof surface, and the push rod base (15) has a bottom sealing space.

5. The push rod according to claim 1, characterized in that: The motor sleeve (13) is fitted with an adapter sleeve (14) to form a stepped rigid support.

6. The push rod according to claim 1, characterized in that: The bearing (11) is provided with bearing buffer pads (10) and bearing retaining rings (8) on both sides, which absorb axial impact force through elastic deformation to achieve flexible stall.

7. The push rod according to claim 1, characterized in that: The drive shaft (7) has a rectangular groove at the connection end with the lead screw, and the motor output shaft has a tangent edge. The two mesh to transmit torque.

8. The push rod according to claim 6, characterized in that: The telescopic rod (2) is also provided with a skeleton oil seal (3), and the bottom of the telescopic rod (2) is provided with a hole bottom buffer pad (5), which works in conjunction with the bearing buffer pad (10) to achieve bidirectional flexible stop.

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