CPC B60K 7/0007 (2013.01) [B60K 17/043 (2013.01)] | 2 Claims |
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.
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