US 12,451,760 B2
Integrated drive gear motor assembly for a vehicle
Ning Guo, Xiangyang (CN); Shengli Hu, Xiangyang (CN); Kaishuo Zhang, Xiangyang (CN); and Minghan Tang, Xiangyang (CN)
Assigned to DONGFENG DANA AXLE CO., LTD., Hubei (CN)
Appl. No. 16/644,483
Filed by DONGFENG DANA AXLE CO., LTD., Hubei (CN)
PCT Filed Aug. 31, 2018, PCT No. PCT/CN2018/103427
§ 371(c)(1), (2) Date Mar. 4, 2020,
PCT Pub. No. WO2019/047772, PCT Pub. Date Mar. 14, 2019.
Claims priority of application No. 201721130755.9 (CN), filed on Sep. 5, 2017.
Prior Publication US 2020/0287442 A1, Sep. 10, 2020
Int. Cl. H02K 7/116 (2006.01); H02K 7/08 (2006.01)
CPC H02K 7/116 (2013.01) [H02K 7/085 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An integrated drive gear motor assembly for an electric vehicle, the integrated drive gear motor assembly comprising:
an electric vehicle motor housing with a stator and a rotor located within the housing;
an electric vehicle motor output shaft with the rotor attached thereto and rotatably mounted within the housing via a pair of ball bearings with the rotor and a portion of the motor output shaft between each one of the pair of bearings so as to rotate the rotor within the stator and within the housing, with a gear portion of the motor output shaft extending out of the stator and the housing, wherein the motor output shaft is hollow along its entire axial length and is formed as a one-piece hollow tube;
an electric vehicle drive gear formed in the gear portion of the motor output shaft; and
an inner ball bearing and an outer ball bearing positioned outside of the housing and attached to the motor output shaft with the gear portion positioned between the inner ball bearing and the outer ball bearing,
wherein the drive gear is connected to the motor output shaft without splines or auxiliary connection structures such that the drive gear is integrally formed, unitary and one-piece with the motor output shaft and thereby rotates with the motor output shaft, and
wherein, so as to minimize an axial length of the integrated drive gear motor assembly, the housing and the inner ball bearing are directly axially adjacent to one another, the inner ball bearing and the drive gear are directly axially adjacent to one another, and the outer ball bearing and the drive gear are directly axially adjacent to one another.