Self-locking device of electric actuating mechanism

Abstract

The utility model discloses a self-locking device of an electric actuating mechanism, which is characterized in that the self-locking device of the electric actuating mechanism comprises an upper shell, a lower shell, an output shaft fixing plate arranged on the lower shell, a motor fixed on the output shaft fixing plate, motor teeth arranged on a motor shaft, and an intermediate gear meshed with the motor gear, the gear shaft is fixed on a central hole of the intermediate gear, the main gear is meshed with the gear shaft, and the output shaft is arranged on a central hole of the main gear. The electric actuating mechanism is powered on, the motor drives the motor gear, the intermediate gear, the gear shaft and the main gear to rotate when the motor runs, the convex claw on the main gear pushes the steel ball to drive the output shaft to rotate, and if the motor stops running and the output shaft is rotated by external force, the hexagonal boss on the output shaft pushes the steel ball outwards to drive the output shaft to rotate. At the moment, the fixed shaft sleeve and the steel ball lock the output shaft and cannot rotate, and the self-locking function is achieved.

Description

Technical field:

[0001] The utility model belongs to the field of electric actuators, in particular to a self-locking device for electric actuators. Background technology:

[0002] There are two main ways of self-locking of existing electric actuators. One is an electric actuator with a worm gear structure, which realizes the self-locking function through the inherent characteristics of the worm gear structure. The other is an electric actuator with a spur gear structure, which realizes the self-locking function through motor brakes. The existing self-locking of electric actuators has the following disadvantages: 1. The electric actuator with a worm gear structure has low transmission efficiency, high cost, and large space occupation. 2. The electric actuator with a motor brake self-locking has a complex electrical structure, high failure rate, and short service life. Utility model content:

[0003] The purpose of the utility model is to provide a self-locking device for an electric actuator, which has a compact structure, low cost and long service life, and overcomes the shortcomings and deficiencies of existing common electric actuators.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is: a self-locking device of an electric actuator, comprising an upper housing, a lower housing, an output shaft fixing plate installed on the lower housing, a motor fixed on the output shaft fixing plate, motor teeth installed on the motor shaft, an intermediate gear meshing with the motor gear, a gear shaft fixed on the center hole of the intermediate gear, a main gear meshing with the gear shaft, an output shaft installed on the center hole of the main gear, a fixed sleeve fixed on the lower housing, and a steel ball installed between the fixed sleeve and the output shaft. A card slot and a hexagonal boss are provided on the output shaft, a snap ring is installed in the card slot, each face of the hexagonal boss is provided with an arc groove, six convex claws are provided at the bottom of the main gear, and a convex ridge is provided on the side of the fixed sleeve.

[0005] According to the utility model, the following effects can be achieved:

[0006] When the electric actuator is energized, the motor drives the motor gear, intermediate gear, gear shaft and main gear to rotate when the motor is running. The convex claw on the main gear pushes the steel ball to drive the output shaft to rotate. If the motor stops running and the output shaft is rotated by external force, the hexagonal boss on the output shaft pushes the steel ball outward. At this time, the fixed sleeve and steel ball lock the output shaft and prevent it from rotating, thus realizing the self-locking function. Description of the drawings:

[0007] Figure 1 This is a schematic diagram of the structure of the utility model

[0008] Figure 2 Schematic diagram of the self-locking structure of the utility model

[0009] Figure 3 An exploded view of the self-locking structure of the utility model

[0010] Figure 4 Schematic diagram of the output shaft of the utility model structure

[0011] Figure 5 This is a schematic diagram of the main gear structure of the utility model

[0012] Figure 6 Schematic diagram of the fixed sleeve of the utility model structure

[0013] Figure 7 This is the appearance diagram of the structure of the utility model

[0014] exist Figure 1 Among them, 1 is the motor, 2 is the reduction box, 3 is the motor gear, 4 is the motor gear bearing, 5 is the motor gear oil seal, 6 is the gear shaft, 7 is the main gear bearing, 8 is the steel ball, 9 is the output shaft lower bearing, 10 is the output shaft, 11 is the output shaft oil seal, 12 is the fixed sleeve, 13 is the main gear, 14 is the lower housing, 15 is the output shaft fixed plate, 16 is the output shaft upper bearing, and 17 is the intermediate gear.

[0015] exist Figure 2 Among them, 7 is the main gear bearing, 8 is the steel ball, 9 is the lower bearing of the output shaft, 10 is the output shaft, 12 is the fixed sleeve, 13 is the main gear, 16 is the upper bearing of the output shaft, and 18 is the retaining ring.

[0016] exist Figure 3 Among them, 7 is the main gear bearing, 8 is the steel ball, 9 is the lower bearing of the output shaft, 10 is the output shaft, 12 is the fixed sleeve, 13 is the main gear, 16 is the upper bearing of the output shaft, and 18 is the retaining ring.

[0017] exist Figure 4 In the figure, 10 is the output shaft, 10-1 is the output shaft slot, 10-2 is the output shaft hexagonal boss, and 10-3 is the output shaft arc groove.

[0018] exist Figure 5 Among them, 13 is the main gear and 13-1 is the main gear cam.

[0019] exist Figure 6 In the figure, 12 is a fixed shaft sleeve, and 12-1 is a fixed shaft ridge.

[0020] exist Figure 7 In the figure, 14 is a lower shell and 19 is an upper shell. Specific implementation method:

[0021] The utility model is described in detail below with reference to the accompanying drawings:

[0022] The utility model discloses a self-locking device of an electric actuator structure, comprising an upper housing 19, a lower housing 14, an output shaft fixing plate 15 installed on the lower housing, a motor 1 fixed on the output shaft fixing plate, a motor tooth 3 installed on the motor shaft, an intermediate gear 17 meshing with the motor gear, a gear shaft 6 fixed on the center hole of the intermediate gear, a main gear 13 meshing with the gear shaft, an output shaft 10 installed on the center hole of the main gear, a fixed sleeve 12 fixed on the lower housing, and a steel ball 8 installed between the fixed sleeve and the output shaft. A clamping groove 10-1 and a hexagonal boss 10-2 are provided on the output shaft, a clamping ring 18 is installed in the clamping groove, each surface of the hexagonal boss is provided with a circular arc groove 10-3, six convex graspings 13-1 are provided at the bottom of the main gear, and a convex ridge 12-1 is provided on the side of the fixed sleeve.

[0023] When the electric actuator is powered on, the motor (1) drives the motor gear (3), the intermediate gear (17), the gear shaft (6) and the main gear (13) to rotate, and the convex catch (13-1) on the main gear pushes the steel ball (8) to drive the output shaft (10) to rotate. When the motor (1) stops running and the output shaft (11) is rotated by external force, the hexagonal boss (10-2) on the output shaft pushes the steel ball (8) outwards, and at this time, the fixed shaft sleeve (12) and the steel ball (8) lock the output shaft (10) so that it cannot rotate, thereby realizing a self-locking function.

Claims

1. A self-locking device for an electric actuator, characterized in that: The invention comprises an upper shell (19), a lower shell (14), an output shaft fixing plate (15) installed on the lower shell, a motor (1) fixed on the output shaft fixing plate, a motor tooth (3) installed on the motor shaft, an intermediate gear (17) meshing with the motor gear, a gear shaft (6) fixed on the center hole of the intermediate gear, a main gear (13) meshing with the gear shaft, an output shaft (10) installed on the center hole of the main gear, a fixed shaft sleeve (12) fixed on the lower shell, a steel ball (8) installed between the fixed shaft sleeve and the output shaft, a clamping groove (10-1) and a hexagonal boss (10-2) are provided on the output shaft, each surface of the hexagonal boss is provided with an arc groove (10-3), six convex claws (13-1) are provided at the bottom of the main gear, and a convex ridge (12-1) is provided on the side of the fixed shaft sleeve.

2. According to claim 1, the self-locking device of an electric actuator is characterized in that: The output shaft is provided with a clamping groove, in which a clamping ring is installed.

3. The self-locking device of an electric actuator according to claim 1, characterized in that: The output shaft is provided with a hexagonal boss, and each surface of the hexagonal boss is provided with an arc groove.

4. The self-locking device of an electric actuator according to claim 1, characterized in that: There are six protrusions on the bottom of the main gear.

5. The self-locking device of an electric actuator according to claim 1, characterized in that: A convex ridge is arranged on the side of the fixed shaft sleeve, and the convex ridge is installed on the lower shell body to limit the rotation of the fixed shaft sleeve.

6. The self-locking device of an electric actuator according to claim 1, characterized in that: Six steel balls are arranged between the arc groove on the side surface of the hexagonal boss of the output shaft and the fixed shaft sleeve, and six convex claws of the main gear are respectively arranged between the six steel balls.

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