Electric actuating mechanism

Abstract

The utility model discloses an electric actuating mechanism which comprises a shell, an adjustable-speed motor, a sun gear assembly, a planetary gear assembly, an inner and outer duplex gear ring, a basin gear and a worm, wherein the adjustable-speed motor, the sun gear assembly, the planetary gear assembly, the inner and outer duplex gear ring, the basin gear and the worm are arranged in the shell. A power output hole is formed in the lower end face of the shell, the basin tooth is rotatably arranged at the bottom in the shell, the bottom of the basin tooth is in clearance fit with the power output hole, the inner-outer duplex gear ring is coaxially and rotatably arranged above the basin tooth, and all planetary gears of the planetary gear assembly are meshed with inner teeth of the inner-outer duplex gear ring and inner teeth of the basin tooth. The central gear assembly is assembled on the central axis of the planetary gear assembly, a bottom gear of the central gear assembly is meshed with all planetary gears of the planetary gear assembly, an output shaft of the speed regulating motor is fixedly sleeved with a driving gear, the driving gear is meshed with a top gear of the central gear assembly, and the worm is meshed with an outer gear ring of the inner and outer duplex gear ring. Friction and loss in the transmission process can be reduced, and transmission efficiency and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial automation control, and particularly relates to an electric actuator. Background Art

[0002] With the rapid development of industrial automation technology, as a key component in the control system, the performance and stability of the electric actuator directly affect the operation efficiency and product quality of the entire production line. The traditional electric actuator consists of a handwheel, a clutch, an input-output shaft, a worm and worm gear transmission pair, a servo motor, etc. There are relatively large friction and losses in the transmission process of the traditional electric actuator. When dealing with complex and changeable working conditions, there are often problems such as poor dynamic load adaptation, poor anti-shock ability, high energy consumption, long full stroke time, rapid motor temperature rise during frequent operation, low transmission efficiency, and high maintenance cost. Content of the Utility Model

[0003] In view of this, the utility model provides an electric actuator to reduce the friction and losses in the transmission process and improve the transmission efficiency and stability.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] An electric actuator includes a housing and a speed control motor, a central gear assembly, a planetary gear assembly, an internal and external double-connected gear ring, a bevel gear and a worm arranged in the housing;

[0006] A power output hole is provided on the lower end surface of the housing. The bevel gear is rotatably assembled at the bottom inside the housing, and the outer wall of the bottom of the bevel gear is in clearance fit with the inner wall of the power output hole. The internal and external double-connected gear ring is coaxially and rotatably arranged above the bevel gear. Each planetary gear of the planetary gear assembly meshes with the internal teeth of the internal and external double-connected gear ring and the internal teeth of the bevel gear. The central gear assembly is assembled on the central axis of the planetary gear assembly, and the bottom gears of the central gear assembly mesh with each planetary gear of the planetary gear assembly. The speed control motor is fixedly arranged above the side of the central gear assembly. A driving gear is fixedly sleeved on the output shaft of the speed control motor, and the driving gear meshes with the top gear of the central gear assembly. The worm meshes with the outer gear ring of the internal and external double-connected gear ring.

[0007] To better implement the above technical solutions, optionally, the speed control motor is a permanent magnet DC brushless speed control motor.

[0008] Optionally, the pitch circles of the internal teeth of the internal and external double-connected gear ring and the internal teeth of the bevel gear are the same.

[0009] Optionally, a handwheel shaft movably penetrating the housing is fixedly arranged at the end of the worm away from the internal and external double-connected gear ring, and a handwheel is fixedly assembled at the end of the handwheel shaft outside the housing.

[0010] Optionally, a debugging dial is provided at the top end of the central axis of the central gear assembly.

[0011] Optionally, a speed measurement gear is fixedly sleeved on the central gear assembly and is located between the debugging dial and the top gear, and a potentiometer gear meshing with the speed measurement gear is further provided in the housing.

[0012] Advantages of the present utility model:

[0013] An electric actuator of the present utility model, an NGW type planetary gear transmission mechanism composed of a worm, a central gear assembly, a planetary gear assembly, and an internal and external double-connected gear ring, has the characteristics of compact structure, small volume, small mass, large load-bearing capacity, large transmission power range and transmission range, low running noise, high efficiency and long service life, effectively reducing friction and loss in the transmission process, and improving transmission efficiency and stability; at the same time, a permanent magnet DC brushless speed regulation motor is adopted, which improves the speed of the motor and can be adjusted, and reduces the temperature rise caused by frequent start and stop of the motor. Description of the drawings

[0014] Figure 1 is a top view of an electric actuator according to an embodiment of the present utility model;

[0015] Figure 2 is Figure 1 a sectional view taken along line A-A in

[0016] Figure 3 is Figure 1 a sectional view taken along line B-B in

[0017] Figure 4 is Figure 2 a top view of the planetary gear assembly in

[0018] Figure 5 is Figure 4 a sectional view of the planetary gear assembly in

[0019] Reference numerals:

[0020] Main housing 10, power output hole 101, first bearing 102, second bearing 103, upper cover 20, glass gland 21, speed regulation motor 30, motor mounting plate 31, driving gear 301, central gear assembly 40, bottom gear 401, top gear 402, debugging dial 403, speed measurement gear 404, potentiometer gear 405, potentiometer 406, planetary gear assembly 50, planetary gear 501, internal and external double-connected gear ring 60, gear ring pressing strip 61, bevel gear 70, worm 80, handwheel shaft 81, handwheel 82. Detailed implementation manners

[0021] The technical solution of the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Among them, the same components are denoted by the same reference numerals.

[0022] Please refer to Figures 1 to 5 , an electric actuator disclosed in an embodiment of the present utility model includes a housing and a speed control motor 30, a central gear assembly 40, a planetary gear assembly 50, an internal and external double-link gear ring 60, a bevel gear 70, and a worm 80 disposed in the housing.

[0023] As Figures 1 to 3 shown, the housing includes a main housing 10 and an upper cover 20 fixedly covering the upper port of the main housing 10. The main housing 10 and the upper cover 20 jointly enclose a closed assembly cavity. The speed control motor 30, the central gear assembly 40, the planetary gear assembly 50, the internal and external double-link gear ring 60, the bevel gear 70, and the worm 80 are all disposed in the assembly cavity. A power output hole 101 is opened at the center of the lower end of the main housing 10.

[0024] As Figures 1 to 3 shown, the bevel gear 70 is rotatably assembled at the bottom inside the housing, and the outer wall of the bottom of the bevel gear 70 is in clearance fit with the inner wall of the power output hole 101. Specifically, a first bearing 102 is fixedly assembled on the upper part of the power output hole 101, and the lower outer wall of the bevel gear 70 is fixed on the inner ring of the first bearing 10, enabling the bevel gear 70 to rotate inside the main housing 10.

[0025] As Figures 1 to 3 shown, the internal and external double-link gear ring 60 is coaxially and rotatably stacked on the bevel gear 70. Specifically, the internal and external double-link gear ring 60 is rotatably disposed on the bevel gear 70 through a gear ring pressing strip 61. Each planetary gear 501 of the planetary gear assembly 50 meshes with the internal teeth of the internal and external double-link gear ring 60 and the internal teeth of the bevel gear 70. The central gear assembly 40 is assembled on the central axis of the planetary gear assembly 50, and the bottom gears 401 of the central gear assembly 40 all mesh with the respective planetary gears 501 of the planetary gear assembly 50. The speed control motor 30 is fixedly disposed above the side of the central gear assembly 40. Specifically, a motor mounting plate 31 is fixedly disposed inside the main housing 10 directly above the central gear assembly 40. A through hole is provided at the center of the motor mounting plate 31. Second bearings 103 are provided on both the top surface and the bottom surface of the central through hole of the motor mounting plate 31. The central shaft of the central gear assembly 40 is in cooperation with the second bearings 103 on the top surface and the bottom surface of the motor mounting plate 31, enabling the central shaft of the central gear assembly 40 to be fixedly penetrated through the motor mounting plate 31. The output shaft of the speed control motor 30 is fixedly sleeved with a driving gear 301, and the driving gear 301 meshes with the top gear 402 of the central gear assembly 40. The worm 80 meshes with the outer gear ring of the internal and external double-link gear ring 60.

[0026] In the embodiment of the present utility model, the speed-regulating motor 30 is a permanent magnet DC brushless speed-regulating motor. The permanent magnet brushless DC motor consists of a motor main body and a driver. The rotor of the motor is composed of rare earth permanent magnet alloy materials such as neodymium iron boron (Nd-Fe-B). Its volume is reduced by one level compared with that of a brushed motor or a three-phase asynchronous motor of the same capacity. A position sensor is installed in the motor to detect the polarity of the electric rotor. The driver composed of integrated circuits and electronic devices controls the start, stop, speed change, forward and reverse rotation of the motor and provides protection and display. The brushless motor replaces mechanical commutation with electronic commutation, has no mechanical friction, no wear, no electric spark, requires no maintenance and has better sealing performance.

[0027] In the embodiment of the present utility model, the pitch circles of the internal teeth of the internal and external double-connected gear ring 60 and the internal teeth of the crown gear 70 are the same, and the tooth number difference is realized through modified processing. This structure can not only effectively transmit and magnify the torque, but also reduce the transmission backlash and increase the transmission efficiency.

[0028] In the embodiment of the present utility model, a handwheel shaft 81 that movably penetrates the housing is fixedly provided at the end of the worm 80 away from the internal and external double-connected gear ring 60. A handwheel 82 is fixedly assembled at the end of the handwheel shaft 81 located outside the housing. Specifically, the gear ring pressing strip 61 has a notch with a central angle of 60°, so that 1 / 6 of the external gear ring of the internal and external double-connected gear ring 60 is exposed to mesh with the worm 80.

[0029] In the embodiment of the present utility model, a debugging scale disk 403 is provided at the top end of the central shaft of the central gear assembly 40, and a glass pressing cover 21 is provided at the center of the upper cover 20. The indication of the debugging scale disk 403 can be observed through the glass pressing cover 21.

[0030] In the embodiment of the present utility model, a speed measurement gear 404 is fixedly sleeved on the central gear assembly 40 between the debugging scale disk 403 and the top gear 402. A potentiometer gear 405 meshing with the speed measurement gear 404 and a potentiometer 406 electrically connected to the potentiometer gear 405 are also provided in the housing. The potentiometer 406 is preferably an absolute encoder. The setting of the potentiometer 406 facilitates measuring the rotation speed of the central gear assembly 40.

[0031] The working principle of an electric actuator in the embodiment of the present utility model is as follows:

[0032] When the electric regulating actuator is adjusted, the output shaft of the speed-regulating motor 30 drives the driving gear 301 to rotate. The rotation of the driving gear 301 drives the central gear assembly 40 to rotate. Since the worm 80 has a self-locking function, at this time, the internal and external double-connected gear ring 60 is relatively stationary. Each planetary gear 501 of the planetary gear assembly 50 rotates around its own axis under the drive of the central gear assembly 40, and at the same time rolls around the internal gear ring of the internal and external double-connected gear ring 60. Driven by the planetary gear 501, the crown gear 70 rotates relative to the internal and external double-connected gear ring 60, thereby outputting torque.

[0033] When manually adjusting the actuator, manually rotate the handwheel 82, and the worm 80 drives the internal and external double-ring gear 60 to rotate. The rotation of the internal and external double-ring gear 60 drives the rotation of each planetary gear 501 of the planetary gear assembly 50. The rotation of each planetary gear 501 of the planetary gear assembly 50 drives the ring gear 70 to rotate, so that the ring gear 70 and the internal and external double-ring gear 60 rotate simultaneously, thereby outputting torque.

[0034] An electric actuator according to an embodiment of the present invention, the NGW type planetary gear 501 transmission mechanism composed of a worm 80, a central gear assembly 40, a planetary gear assembly 50 and an internal and external double-ring gear 60 has the characteristics of compact structure, small volume, small mass, large load-bearing capacity, large transmission power range and transmission range, low running noise, high efficiency and long service life, effectively reducing friction and loss during transmission, and improving transmission efficiency and stability; at the same time, a permanent magnet DC brushless speed regulation motor is adopted, which improves the speed of the motor and can be adjusted, and reduces the temperature rise of the motor during frequent start and stop; the internal and external double-ring gear 60 and the worm 80 form a worm and worm gear 80 structure, forming a position self-locking function, realizing a clutchless handwheel 82, and achieving a seamless smooth switch between manual and automatic working states.

[0035] The above is a detailed introduction to the technical solution of the present invention in combination with specific embodiments, and the described specific embodiments are used to help understand the idea of the present invention. The derivations and deformations made by those skilled in the art based on the specific embodiments of the present invention also fall within the protection scope of the present invention.

Claims

1. An electric actuator, characterized in that: It comprises a housing and a speed regulating motor (30) arranged in the housing, a central gear assembly (40), a planetary gear assembly (50), an inner and outer double gear ring (60), a basin gear (70) and a worm (80); The lower end surface of the housing is provided with a power output hole (101); the basin gear (70) is rotatably mounted on the bottom of the housing, and the outer wall of the bottom of the basin gear (70) is clearance-matched with the inner wall of the power output hole (101); the inner and outer double gear rings (60) are coaxially and rotatably arranged above the basin gear (70); each planetary gear (501) of the planetary gear assembly (50) is meshed with the inner teeth of the inner and outer double gear rings (60) and the inner teeth of the basin gear (70); the central gear assembly (40) is mounted on the planetary gear assembly The central gear assembly (40) is arranged on the central axis of the central gear assembly (50), and the bottom gears (401) of the central gear assembly (40) are meshed with the planetary gears (501) of the planetary gear assembly (50). The speed regulating motor (30) is fixedly arranged on the upper side of the central gear assembly (40). The output shaft of the speed regulating motor (30) is fixedly sleeved with a driving gear (301). The driving gear (301) is meshed with the top gear (402) of the central gear assembly (40). The worm (80) is meshed with the outer gear ring of the inner and outer double gear rings (60).

2. An electric actuator according to claim 1, characterized in that: The speed regulating motor (30) is a permanent magnet direct current brushless speed regulating motor.

3. The electric actuator according to claim 1, characterized in that: The pitch circles of the inner teeth of the inner and outer duplex gear ring (60) and the inner teeth of the basin gear (70) are the same.

4. The electric actuator according to claim 1, characterized in that: The end of the worm (80) away from the inner and outer double gear rings (60) is fixedly provided with a handwheel shaft (81) that movably penetrates the housing, and the end of the handwheel shaft (81) located outside the housing is fixedly equipped with a handwheel (82).

5. The electric actuator according to claim 1, characterized in that: A debugging dial (403) is provided at the top end of the central axis of the central gear assembly (40).

6. An electric actuator according to claim 5, characterized in that: A speed measuring gear (404) is fixedly sleeved on the central gear assembly (40) and is located between the debugging dial (403) and the top gear (402). A potentiometer gear (405) meshing with the speed measuring gear (404) is also provided in the housing. The potentiometer gear (405) is electrically connected to a potentiometer (406).

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