Motor-incorporated hypocycloid-type speed reducer

A motor-incorporated hypocycloid-type speed reducer comprising:

• a casing having a case and an end plate;
• a rotor rotatably supported by the casing and actuated electrically to be rotated;
• an eccentric portion configured to rotate in response to rotation of the rotor;
• an internal ring gear fixed to the casing and including a first internal gear which is coaxial with the rotor;
• an output shaft including a second internal gear which is coaxial with the rotor;
• an external gear including a first external gear and a second external gear which are coaxial with each other, the first external gear gear-meshed with the first internal gear and the second external gear gear-meshed with the second internal gear, and the external gear rotatably supported by the eccentric portion so as to rotate in an eccentric manner;
• a supporting member secured to the casing and the output shaft interposed between the supporting member and the end plate in an axial direction;
• a first sliding member held tight in the axial direction between one end surface of the output shaft and the end plate;
• and
• a second sliding member held tight in the axial direction between an other end surface of the output shaft and the supporting member, wherein the output shaft is rotatably supported by the first sliding member and the second sliding member.