Importance

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Abstract

An in-wheel motor drive device includes a motor part, a speed reduction part, a wheel bearing part, and a casing configured to hold those parts. The motor part is configured to rotationally drive an input shaft of a speed reducer having eccentric portions. The speed reduction part is configured to reduce a speed of rotation of the input shaft of the speed reducer to transmit the rotation to an output shaft of the speed reducer. The wheel bearing part is connected to the output shaft of the speed reducer. The speed reduction part includes a lubrication mechanism for the speed reduction part, which is configured to supply lubricating oil to the speed reduction part. Rolling bearings configured to support the input shaft of the speed reducer are ball bearings each having an initial radial internal clearance of from 10 μm to 60 μm.

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First Claim