Patent ID: 9705378
Date: 2017-07-11
CPC Classifications: B60K,B60L,H02K,Y02T

Claim:
1. A drive device for an electric vehicle, comprising: an electric motor; a speed reduction unit including an input shaft driven by output of the electric motor; a hub unit rotationally driven by an output member of the speed reduction unit; and a housing accommodating the electric motor and the speed reduction unit, wherein the electric motor is disposed on an outer radial side of the speed reduction unit in the housing, a support member of a rotor of the electric motor is fitted to the input shaft of the speed reduction unit, and the input shaft is supported by a pair of bearings disposed at two locations on both sides of an input gear of the speed reduction unit, the drive device for an electric vehicle being configured such that the pair of bearings at the two locations are together supported by the output member, the pair of bearings being provided between an inner radial surface of each of a pair of flanges of the output member and an outer radial surface of the input shaft opposing each of the inner radial surfaces of the pair of flanges to support the input shaft, and both of the pair of bearings being disposed on an outboard side of a fitting portion between the input shaft and the rotor support member of the electric motor to form a cantilever support structure, a partition for partitioning an accommodation section into respective accommodation spaces for the electric motor and the speed reduction unit is provided in the housing, a peripheral edge portion of a center hole provided in the partition is disposed closer to an outer periphery of a boss portion of the rotor on an inboard side of the bearings at the two locations, and a first oil seal member is placed between the peripheral edge portion of the center hole and the boss portion.