Patent ID: 7247963

Claim:
An eccentric rotor rotatable about a shaft comprising: a commutator substrate having a plurality of commutator segments, armature coils on said substrate, a bearing receiving said shaft and having at least one cylindrical section having an outer diameter, a weight, an integral resin molded structure which integrally molds together said substrate, said armature coils, said bearing and said weight, said rotor having a first outer side and a second outer side, said weight having a first outer face defining a part of said first outer side and a second outer face defining a part of said second outer side, said substrate having an outer surface substantially coplanar with said second outer face of said weight; wherein said weight has an outer peripheral portion, said integral resin molded structure having an outer peripheral part disposed radially outwardly of said outer peripheral portion of said weight, said outer peripheral part having an outer circumferential surface extending in an axial direction of said eccentric rotor; and wherein said outer peripheral portion of said weight has at least one outer projection extending radially outward from said outer peripheral portion of said weight to said outer circumferential surface of said integral resin molded structure.