In-wheel motor drive device

An in-wheel motor drive device comprising:

• a wheel hub bearing unit having an outer ring, an inner ring passing through a center hole of the outer ring and protruding from the outer ring to one side in an axial direction, a plurality of rolling elements disposed in double rows in an annular space between the outer ring and the inner ring, and fixing means for fixing the outer ring to a non-rotary member, the non-rotary member being a suspension member;
• a motor unit configured to drive the inner ring;
• and
• a brake disk having a connecting portion configured to be connected with one end of the inner ring in the axial direction, a cylindrical portion extending from the connecting portion to the other side in the axial direction and disposed coaxially to the inner ring, and a flange-shaped friction disk portion extending towards an outer diameter from the other end of the cylindrical portion in the axial direction, wherein
• the fixing means is a fixing bolt which is disposed at an outer diameter side of the outer ring,
• the fixing bolt includes a head disposed on one side of the outer ring in the axial direction,
• the inner ring includes an inner ring flange on one side of the inner ring in the axial direction,
• the inner ring flange is provided with fastening means for receiving a wheel fixing bolt,
• the brake disk is fixed to the inner ring flange by the wheel fixing bolt,
• the fixing bolt is disposed completely radially outside of the fastening means, and
• at least a part of the head of the fixing bolt is received in an internal space of the cylindrical portion of the brake disk.