MECHANICAL MOTOR-DRIVEN FRICTION BRAKE DEVICE FOR RAIL VEHICLE

Abstract

A mechanical motor-driven friction brake device for a rail vehicle consists of a torque motor, an electromagnetic brake (5), a screw nut transmission mechanism, and a brake friction pair (6), the torque motor and a screw (4) being coaxially mounted, the screw (4) being in non-self-locking threaded connection with a nut (3), and one end of the nut (3) being connected to the brake friction pair (6); the device drives, by means of the torque motor, the screw (4) to rotate so as to drive the nut (3) to perform linear motion and outputs a pressure or a pulling force to the brake friction pair (6), so as to brake or release the rail vehicle; in addition, this device can lock the screw by means of the electromagnetic brake (5), realizing the function of parking brake.

Claims

1. A motor-driven friction braking device for a rail vehicle, consisting of a torque motor, an electromagnetic brake (5), a nut (3), a screw (4) and a brake friction pair (6), wherein the torque motor comprises a torque motor rotor (2) and a torque motor body (1); the torque motor is of a hollow structure; the screw (4) is inserted into the hollow part of the torque motor and is coaxially and fixedly connected to the motor; the screw (4) is sleeved with the nut (3) and is in non-self-locking threaded connection with the nut (3); one end of the nut (3) is connected to the brake friction pair (6); the electromagnetic brake (1) sleeves the screw (4); the torque motor rotor (2) generates a braking torque which is transmitted to the braking friction pair (6) through the screw (4) and the nut (3) in sequence to achieve braking.

2. The motor-driven friction braking device for the rail vehicle according to claim 1, wherein the torque motor is a hollow torque motor; the torque motor rotor is coaxially and fixedly connected to the screw (4); when the torque motor rotor (2) rotates forward, an adjustable torque is output to the screw (4) to implement braking; when the torque motor rotor (2) rotates reversely, releasing is implemented.

3. The motor-driven friction braking device for the rail vehicle according to claim 1, wherein the screw (4) is in non-self-locking threaded connection with the nut (3); and the nut (3) converts a rotational motion of the screw (4) into an axial motion and outputs an axial thrust.

4. The motor-driven friction braking device for the rail vehicle according to claim 1, wherein when the electromagnetic brake (5) is de-energized, the electromagnetic brake (5) is actuated and cannot rotate freely; when the electromagnetic brake (5) is energized, the screw (4) is disengaged from the electromagnetic brake (5) and can rotate freely.

5. The motor-driven friction braking device for the rail vehicle according to claim 1, wherein after the braking force is applied, the electromagnetic brake (5) is powered off to lock the screw (4), and then the torque motor is stopped to maintain the thrust of the nut (3).

6. A braking method for the motor-driven friction braking device for the rail vehicle according to claim 1, wherein when the torque motor rotor (2) rotates forward, a desired braking torque is generated, and the electromagnetic brake (5) and the screw (4) are electrically separated; the torque motor rotor (2) drives the screw (4) to rotate, and the screw (4) rotates to drive the nut (3) to make a translational motion, resulting in an axial motion; a brake friction pair (6) installed on one end of the nut (3) generates a brake clamping force; if the electromagnetic brake (5) is powered off, the electromagnetic brake (5) will lock the screw (4) and the braking force will be maintained; when the torque motor rotor (2) rotates reversely, the nut (3) makes a translational motion reversely, and the brake friction pair is released.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG. 1 illustrates a schematic diagram of a motor-driven friction braking device for a rail vehicle of the present invention according to an embodiment of the present invention.

[0013] In drawings, reference symbols represent the following components: 1torque motor body, 2torque motor rotor, 3nut, 4screw, 5electromagnetic brake, and 6brake friction pair.

DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings. The structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] The following detailed description refers to the accompanying drawings, which form a part of the detailed description. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings and claims are not intended to be limitative. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter provided by the present invention.

[0016] As shown in FIG. 1, a motor-driven friction braking device for a rail vehicle comprises a torque motor, an electromagnetic brake (5), a nut (3), a screw (4) and a brake friction pair (6), wherein the torque motor comprises a torque motor rotor (2) and a torque motor body (1); the torque motor is of a hollow structure; the screw (4) is inserted into the hollow part of the torque motor and is coaxially and fixedly connected to the motor; the screw (4) is sleeved with the nut (3) and is in non-self-locking threaded connection with the nut (3); one end of the nut (3) is connected to the brake friction pair (6); the electromagnetic brake (5) sleeves the screw (4) and is configured to control a locked state and a freely rotating state of the screw (4); the torque motor rotor (2) generates a braking torque which is transmitted to the braking friction pair (6) through the screw (4) and the nut (3) in sequence to achieve braking.

[0017] The torque motor is a hollow torque motor. The torque motor rotor (4) is coaxially and fixedly connected to the screw (4); when the torque motor rotor (2) rotates forward, an adjustable torque is output to the screw (4) to implement braking; when the torque motor rotor (2) rotates reversely, releasing is implemented.

[0018] The screw (4) is in non-self-locking threaded connection with the nut (3); and the nut (3) converts a rotational motion of the screw (4) into an axial motion and outputs an axial thrust, thereby achieving braking and releasing.

[0019] When the electromagnetic brake (5) is de-energized, the electromagnetic brake (5) is actuated and cannot rotate freely; when the electromagnetic brake (5) is energized, the screw (4) is disengaged from the electromagnetic brake (1) and can rotate freely.

[0020] After the braking force is applied, the electromagnetic brake (5) is powered off to lock the screw (4), and then the torque motor is stopped to maintain the thrust of the nut (3), thereby implementing parking and braking.

[0021] As shown in FIG. 1, a braking method for the motor-driven friction braking device for the rail vehicle is as follows: when the torque motor rotor (2) rotates forward, a desired braking torque is generated, and the electromagnetic brake (5) and the screw (4) are electrically separated; the torque motor rotor (2) drives the screw (4) to rotate, and the screw (4) rotates to drive the nut (3) to make a translational motion, resulting in an axial motion; a brake friction pair (6) installed on one end of the nut (3) generates a brake clamping force; if the electromagnetic brake (5) is powered off, the electromagnetic brake (5) will lock the screw (4) and the braking force will be maintained; when the torque motor rotor (2) rotates reversely, the corresponding nut (3) makes a translational motion reversely, and the brake friction pair is released.

[0022] Although some solutions and embodiments have been disclosed herein, other solutions and embodiments will be apparent to those skilled in the art. The various solutions and embodiments disclosed herein are exemplary and are not intended to be limitative, the true scope and spirit being indicated by the appended claims.