CN212177727U

CN212177727U - Electromechanical actuator suitable for electric brake wheel

Info

Publication number: CN212177727U
Application number: CN202020583054.6U
Authority: CN
Inventors: 孙彬
Original assignee: Guizhou Xinan Aviation Machinery Co Ltd
Current assignee: Guizhou Xinan Aviation Machinery Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-12-18
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses an electromechanical actuator suitable for an electric brake wheel, which comprises a motor, a reduction gear set and a ball screw component; the motor outputs the torque of the motor through the reduction gear set to drive the screw rod in the ball screw assembly to rotate, so that the nut on the screw rod generates linear motion, the brake block is pushed to compress the movable brake disc or the brake block and the movable brake disc are loosened, and the brake function or the brake loosening function is realized. The electromechanical actuator avoids the problems of leakage of hydraulic oil and the like, reduces the weight of the brake wheel, reduces the brake fault diagnosis time, strengthens the maintainability of the brake wheel, and improves the safety and reliability of the brake wheel.

Description

Electromechanical actuator suitable for electric brake wheel

Technical Field

The utility model belongs to automatically controlled wheel braking system field especially relates to an electromechanical actuator suitable for electric brake wheel.

Background

The hydraulic brake device is widely applied to wheel braking at present, and although the hydraulic brake device can meet the basic braking function of an airplane, the existing hydraulic brake system has the following defects which are difficult to overcome: the hydraulic oil leakage is easy to cause fire, the secondary pollution to other parts caused by the oil leakage, the reason is difficult to find after the fault occurs, the maintenance and repair cost is high, and the like.

SUMMERY OF THE UTILITY MODEL

Purpose of the utility model

In order to solve the problem, the utility model provides an electromechanical actuator suitable for electric brake wheel can avoid its hydraulic oil to reveal the scheduling problem, still has the weight and the volume that show to reduce whole braking system, have high braking system fault diagnosis ability, and the maintenance cost is low and advantage such as maintenance time is short, improves the security and the reliability of wheel.

Technical solution of utility model

An electromechanical actuator suitable for an electric brake wheel comprises a motor, a reduction gear set and a ball screw assembly; the motor outputs the torque of the motor through the reduction gear set to drive the screw rod in the ball screw assembly to rotate, so that the nut on the screw rod generates linear motion, the brake block is pushed to compress the movable brake disc or the brake block and the movable brake disc are loosened, and the brake function or the brake loosening function is realized.

Preferably, the reduction gear set comprises a gear I and a gear II, and the gear I and the gear II are both composed of a straight gear and a bevel gear; a straight gear in the gear I is meshed with a gear on an output shaft of the permanent magnet synchronous motor; a bevel gear in the gear I is meshed with a bevel gear in the gear II; and a spur gear in the gear II is meshed with a gear in the ball screw assembly.

Preferably, the gear and the screw rod in the ball screw assembly are of an integral structure, the nut is matched with the screw rod, and a plurality of balls are arranged between the nut and the screw rod.

Preferably, still include the casing of constituteing by last casing, lower casing, gear I, gear II, ball screw subassembly all set up in the casing, all are provided with the bearing between gear I, gear II and the casing.

Preferably, a straight gear in the gear I is connected with a bevel gear through an expansion pin.

Preferably, the motor is a permanent magnet synchronous motor.

Preferably, rotor magnetic steel in the permanent magnet synchronous motor adopts samarium cobalt rare earth permanent magnet steel.

Preferably, the gear I and the gear II are made of martensite precipitation hardening stainless steel materials.

The utility model has the advantages that: the problems of leakage of hydraulic oil and the like are avoided, the weight of the brake wheel is reduced, the brake fault diagnosis time is shortened, the maintainability of the brake wheel is enhanced, and the safety and the reliability of the brake wheel are improved.

Drawings

Fig. 1 is a schematic structural diagram of an electromechanical actuator suitable for an electric brake wheel according to the present invention.

In the figure: 1-motor, 2-gear I, 3-gear II, 4-nut, 5-lower shell, 6-ball screw component and 7-upper shell.

Detailed Description

The utility model discloses a realize through following technical scheme.

An electromechanical actuator suitable for an electric brake wheel comprises a motor 1, a reduction gear set and a ball screw assembly; the motor 1 outputs the torque of the motor 1 through the reduction gear set to drive the screw rod in the ball screw assembly 6 to rotate, so that the nut 4 on the screw rod generates linear motion, the brake block is pushed to press the movable brake disc tightly or the brake block and the movable brake disc are loosened, and the brake function or the brake loosening function is realized.

The reduction gear set comprises a gear I2 and a gear II 3, and the gear I2 and the gear II 3 are both composed of a straight gear and a bevel gear; a straight gear in the gear I2 is meshed with a gear on an output shaft of the permanent magnet synchronous motor 1; a bevel gear in the gear I2 is meshed with a bevel gear in the gear II 3; spur gears in the gear II 3 are meshed with gears in the ball screw assembly 6. And a straight gear in the gear I2 is connected with a bevel gear through an expansion pin.

The gear and the screw rod in the ball screw assembly 6 are of an integral structure, the nut 4 is matched with the screw rod, and a plurality of balls are arranged between the nut 4 and the screw rod.

Still include the casing of compriseing last casing 7, lower casing 5, gear I2, gear II 3, ball screw subassembly 6 all set up in the casing, all are provided with the bearing between gear I2, gear II 3 and the casing.

In order to reduce the weight and the volume of the product, the motor 1 adopts a permanent magnet synchronous motor with small volume, high ambient temperature and good control characteristic, and rotor magnetic steel in the permanent magnet synchronous motor adopts samarium-cobalt rare earth permanent magnet steel.

In order to improve the mechanical bearing capacity and the transmission service life of the electromechanical actuator, the gear I2 and the gear II 3 are made of martensite precipitation hardening stainless steel materials with high strength, compact structure and good corrosion resistance. In order to improve the structural stability and the service life of the electromechanical actuator, the ball screw assembly 6 is made of stainless steel with higher hardness and wear resistance.

The working process is as follows: after the brake control box receives a brake command of the flight control computer, the motor 1 is controlled to rotate forwards according to the brake command, a gear at the shaft end of the motor is in meshing transmission with a gear I2 in a gear set, a straight gear and a bevel gear in the gear I2 are connected through an expansion pin to drive the bevel gear in the gear I2 to be in meshing transmission with the bevel gear of a gear II 3 to drive the gear II 3 to rotate, the straight gear in the gear II 3 is in meshing transmission with a gear in a ball screw assembly 6 to drive a screw rod in the ball screw assembly 6 to rotate so as to enable a screw rod upper nut 4 to generate linear motion, thereby converting the rotary motion into linear motion, generating braking thrust, pushing the brake block to tightly press the brake disc, the brake thrust corresponding to the flight control instruction is output, the actuating force is applied to the brake discs, the brake discs rub with each other to generate friction torque required by braking, and the electric brake wheel is decelerated and braked.

After the brake control box receives a brake loosening instruction of the flight control computer, the electromechanical actuator realizes that the motor 1 reversely rotates to drive the reduction gear set to rotate, the speed of the reduction gear set is reduced, the output of small torque and high rotating speed of the permanent magnet synchronous motor is changed into the output of large torque and low rotating speed to drive the screw rod to rotate, the nut 4 on the screw rod generates linear motion and moves to an initial position, and the brake pad and the movable brake disc are loosened to realize the brake loosening function.

The above embodiments are only for illustrating the technical conception and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, so as not to limit the protection scope of the present invention, and all the equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention. The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. An electromechanical actuator suitable for an electric brake wheel, characterized by comprising an electric motor (1), a reduction gear set and a ball screw assembly; the motor (1) outputs the torque of the motor (1) through the reduction gear set to drive the screw rod in the ball screw assembly (6) to rotate, so that the nut (4) on the screw rod generates linear motion, the brake pad is pushed to press the movable brake disc or the brake pad and the movable brake disc are loosened, and the brake function or the brake loosening function is realized.

2. An electromechanical actuator suitable for an electrically braked wheel, according to claim 1, characterised in that the reduction gear set comprises a gear i (2), a gear ii (3), both the gear i (2) and the gear ii (3) being composed of a spur gear and a bevel gear; a straight gear in the gear I (2) is meshed with a gear on an output shaft of the permanent magnet synchronous motor (1); a bevel gear in the gear I (2) is meshed with a bevel gear in the gear II (3); and a spur gear in the gear II (3) is meshed with a gear in the ball screw assembly (6).

3. An electromechanical actuator for an electric brake wheel according to claim 2, characterised in that the gear wheel of the ball screw assembly (6) is of one piece construction with the screw, the nut (4) cooperates with the screw, and a plurality of balls are provided between the nut (4) and the screw.

4. An electromechanical actuator suitable for an electric brake wheel according to claim 3, further comprising a housing consisting of an upper housing (7) and a lower housing (5), wherein the gear I (2), the gear II (3) and the ball screw assembly (6) are all disposed in the housing, and bearings are disposed between the gear I (2), the gear II (3) and the housing.

5. An electromechanical actuator suitable for an electric brake wheel, according to claim 2, characterised in that the spur gear of the gear i (2) is coupled with the bevel gear by means of an expansion pin.

6. An electromechanical actuator suitable for an electric brake wheel according to any one of claims 1 to 5, characterised in that the motor (1) is a permanent magnet synchronous motor.

7. An electromechanical actuator suitable for a wheel of an electric brake as claimed in claim 6 wherein the rotor magnets in the permanent magnet synchronous motor are samarium cobalt rare earth permanent magnet magnets.

8. An electromechanical actuator suitable for an electrically braked wheel, as claimed in claim 6, wherein the gears I (2) and II (3) are made of martensitic precipitation-hardened stainless steel.