Patent ID: 8002060
Filing Date: 2011-08-23
Classification: B60K,B60L,H02K,Y02T

Abstract:
1. A vehicle wheel driving apparatus comprising: an in-wheel motor; a hub of a wheel which comprises a driven portion; a power transmission mechanism which transmits power of the in-wheel motor to the driven portion of the hub of the wheel; and a double-row rolling bearing which supports the hub and comprises: wherein the in-wheel motor and the power transmission mechanism are mounted in a rim of the wheel, the primary row is offset in an opposite direction from the secondary row along a wheel width direction, and the primary row and the secondary row intersect a common plane that is orthogonal to a rotational axis center of the wheel, wherein the in-wheel motor comprises: a motor shaft supported by a primary double row bearing and a secondary bearing; and an output shaft portion which is extended in a axial direction of the motor shaft from a portion of the motor shaft supported by the primary double row bearing, and transmits the power of the in-wheel motor to the driven portion of the hub, wherein the secondary bearing supports an end of the motor shaft which is opposite side of the output portion, wherein the primary double row bearing comprises: wherein a point of application of load of tertiary row is offset towards the output shaft portion side, a pitch circle diameter of the tertiary row is larger than that of fourth row, and the pitch circle diameter of the tertiary row is set such that the point of application of load of the tertiary row coincides with or gets close to a load point of the output shaft portion.