Drive unit for motor-assisted bicycle

摘要

The invention reduces the weight of a drive unit for motor-assisted bicycle. To achieve this, a case of a drive unit (motor-driven assist unit) 1 is composed of a case main body 70, and left and right covers 70L and 70R. These members constituting the case are each produced from a resin by molding. The peripheries of bearings of a motor shaft 116 and a crank shaft 101, and hanger portions 90a, 91a, and 92a are reinforced by reinforcing members 105, 106 and 107. In particular, the reinforcing member 105 is configured as an integral reinforcing plate obtained by connecting a plurality of reinforcing members to each other.