Mechanical force-amplifying type motor-driven friction braking device for rail vehicle

A mechanical force-amplifying motor-driven friction braking device for a rail vehicle, comprising a torque motor, a speed reduction mechanism, an electromagnetic brake (1), a nut (8), a screw (7) and a brake friction pair (9), wherein the torque motor comprises a torque motor rotor (6) and a torque motor body (5);

• the speed reduction mechanism is composed of a sun gear (4), a planet gear (3) and a planet gear carrier (2);
• the torque motor is of a hollow structure;
• the screw (7) is inserted into the hollow structure of the torque motor and is coaxial with the torque motor;
• the torque motor rotor (6) is fixedly connected to the sun gear (4);
• the planet gear carrier (2) is fixedly connected to the screw (7);
• the screw (7) is sleeved with the nut (8) and is in non-self-locking threaded connection with the nut (8);
• one end of the nut (8) is connected to the brake friction pair (9);
• the electromagnetic brake (1) is sleeved with the screw (7);
• the torque motor rotor (6) generates a braking torque which is transmitted to the braking friction pair (9) through the speed reduction mechanism, the screw (7) and the nut (8) in sequence to achieve braking.