Patent ID: 7976420

Claim:
An eccentric oscillating speed reducer comprising: a camshaft having crank portions, a plurality of externally toothed gear members that respectively have holes, each of which accommodates an associated one of said crank portions, and that are eccentrically moved by rotation of said camshaft, an internally toothed gear member having an inner peripheral surface in which internal teeth to be meshed with external teeth formed on external peripheral surfaces of said externally toothed gear members are formed so as to set the number of said internal teeth to be slightly larger than that of said external teeth, and support members respectively positioned at both ends of said externally toothed gear members so as to rotatably support both ends of said camshaft so that said support members are integrally coupled to each other via a pillar portion, so that a coolant passage passing through said integrally coupled support members and through said pillar portion is provided.