US 11,945,302 B2
Low-floor electric axle assembly
Jian-Qiu Li, Beijing (CN); Jia-Yi Hu, Beijing (CN); Liang-Fei Xu, Beijing (CN); Bing-Kun Cai, Beijing (CN); and Hang Li, Beijing (CN)
Assigned to TSINGHUA UNIVERSITY, Beijing (CN)
Filed by TSINGHUA UNIVERSITY, Beijing (CN)
Filed on Nov. 13, 2020, as Appl. No. 17/096,953.
Application 17/096,953 is a continuation of application No. PCT/CN2018/116577, filed on Nov. 21, 2018.
Claims priority of application No. 201810454446.X (CN), filed on May 14, 2018.
Prior Publication US 2021/0061093 A1, Mar. 4, 2021
Int. Cl. B60K 17/14 (2006.01); B60B 35/00 (2006.01); B60G 9/00 (2006.01); B60G 17/08 (2006.01); B60K 7/00 (2006.01); B60T 1/06 (2006.01); F16H 1/28 (2006.01); F16H 57/04 (2010.01); H02K 7/00 (2006.01); H02K 7/08 (2006.01); H02K 7/102 (2006.01); H02K 7/116 (2006.01); H02K 9/19 (2006.01)
CPC B60K 17/14 (2013.01) [B60B 35/002 (2013.01); B60G 9/00 (2013.01); B60G 17/08 (2013.01); B60K 7/0007 (2013.01); B60T 1/065 (2013.01); F16H 1/28 (2013.01); F16H 57/0476 (2013.01); F16H 57/0486 (2013.01); H02K 7/006 (2013.01); H02K 7/083 (2013.01); H02K 7/102 (2013.01); H02K 7/116 (2013.01); H02K 9/19 (2013.01); B60G 2202/242 (2013.01); B60K 2007/0092 (2013.01); F16H 2001/2881 (2013.01)] 12 Claims
OG exemplary drawing
 
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.