Patent ID: 8234745

Claim:
A motor device comprising: a motor portion having a rotary shaft and a worm gear integrally formed with said rotary shaft, said motor portion being capable of rotating the rotary shaft forward and in reverse; a link mechanism drivingly coupled to the motor portion, the link mechanism being integrally assembled in the motor portion; a sectoral reduction gear arranged between-the motor portion and the link mechanism, the sectoral reduction gear rotating in a reciprocating manner in a predetermined angle range on the basis of the forward rotation and the reverse rotation of the motor portion, the sectoral shape of the sectoral reduction gear having a size corresponding to the reciprocating rotation of the sectoral reduction gear, the sectoral reduction gear having an outer circumferential surface, an outer periphery, and gear teeth formed on the outer circumferential surface for engaging the worm gear, the outer periphery being part of a representative circle, and an inner region of the representative circle having an operating range, in which the sectoral reduction gear rotating in a reciprocating manner in the predetermined angle range passes, and a non-operating range, in which the sectoral reduction gear does not pass; and an output shaft that is rotated in a reciprocating manner by the link mechanism, a part of or the whole of the output shaft being arranged in the non-operating range as seen from an axial direction of the output shaft.