Patent ID: 11945302
Assignee: TSINGHUA UNIVERSITY
Field: Transport (Mechanical engineering)
Classification: CPC B  F  H | IPC B  F  H

Claim 0:
1. A low-floor electric axle assembly, comprising:
an axle housing, two hub motors, two planetary gear reducers, two hubs, a brake system, two C-shaped beams, and a suspension system, wherein mechanical mounting of the suspension system is compatible with a conventional axle;
the axle housing has a left and right symmetrical dumbbell-shaped structure configured to bear a weight of a vehicle;
the hub motors are inner rotor type motors and are separately arranged at two ends of the axle housing left and right symmetrically; the hub motors are arranged coaxially with two wheels respectively; and two hub motor rotors are connected to the planetary gear reducers respectively;
each of the planetary gear reducers is a single-stage planetary gear reducer; a sun gear of each of the planetary gear reducers receives power outputted by each of the hub motors; and two planetary gear reducer housings are power output ends connected to two rims respectively, to transmit the power to the wheels respectively;
each of the hubs is supported over a motor output shaft sleeve through a bearing, and the hubs are connected to the planetary gear reducer housings respectively and connected to the rims respectively;
the brake system is a disc mechanic brake powered by variable pneumatic pressure or variable hydraulic pressure, and comprises two brake discs, brake calipers, and brake air chambers or hydraulic brake cylinders; the brake discs are mounted at output ends of the hub motor rotors respectively; the brake calipers are mounted at the two ends of the axle housing; each of the brake air chambers or each of the hydraulic brake cylinders is arranged at a hollow position of a middle beam of the axle housing;
each of the C-shaped beams is in a C-shaped structure, and is arranged at a side surface of each of half-cylinder structures of the two ends of the axle housing and configured to mount the hub motors; and
the suspension system is a four-air-bag suspension, an air bag assembly and a damper assembly are disposed on each of the C-shaped beams, and a push rod assembly is disposed on the axle housing.