US 11,679,663 B2
In-wheel motor drive device
Ryou Yukishima, Shizuoka (JP); and Katsunori Sato, Shizuoka (JP)
Assigned to NTN CORPORATION, Osaka (JP)
Appl. No. 17/268,332
Filed by NTN CORPORATION, Osaka (JP)
PCT Filed Sep. 9, 2019, PCT No. PCT/JP2019/035329
§ 371(c)(1), (2) Date Feb. 12, 2021,
PCT Pub. No. WO2020/054650, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. JP2018-168800 (JP), filed on Sep. 10, 2018.
Prior Publication US 2021/0316605 A1, Oct. 14, 2021
Int. Cl. B60K 7/00 (2006.01); B60K 17/04 (2006.01)
CPC B60K 7/0007 (2013.01) [B60K 17/043 (2013.01)] 2 Claims
OG exemplary drawing
 
1. An in-wheel motor drive device comprising:
an electric motor part;
a wheel bearing part; and
a speed reducer part configured to decelerate a rotation of the electric motor part and transmit the rotation to the wheel bearing part,
wherein
the speed reducer part is a parallel shaft gear reduction mechanism having three or more axes, the parallel shaft gear reduction mechanism including an input shaft integrally rotating with a rotating shaft of the electric motor part and having an input gear, an output shaft integrally rotating with a rotating shaft of the wheel bearing part and having an output gear, and an intermediate shaft having an input-side intermediate gear that meshes with the input gear and an output-side intermediate gear that meshes with the output gear,
the input gear, the output gear, the input-side intermediate gear, and the output-side intermediate gear are helical gears,
the output gear and the output-side intermediate gear have a larger module than the input gear and the input-side intermediate gear,
the input gear and the input-side intermediate gear have a larger twisting angle than the output gear and the output-side intermediate gear, and
the output gear and the output-side intermediate gear have a larger effective tooth length than the input gear and the input-side intermediate gear.