Patent ID: 7640827

Claim:
A gear unit of a motor, the gear unit comprising: a motor portion having a motor shaft; a worm receiving driving torque from said motor portion via said motor shaft; a helical gear receiving torque from said worm; an output shaft, said output shaft rotating with said helical gear for transmitting the torque to an outside location; a gear box composed of resin; a fixed shaft fixed to said gear box at a center position thereof, said fixed shaft being constructed in a hollow and cylindrical shape having an opening at one end portion thereof, and a ceiling surface at least partially closing another end portion thereof, said open side end portion of said fixed shaft being subjected to dislocation preventive work, said open side end portion being fixed to said gear box, said dislocation preventive work including a collar-shaped portion formed on an outer periphery of said fixed shaft on said open side end portion, said collar-shaped portion protruding from the outer periphery of said open side end portion in a radial direction, said radial direction being perpendicular to a longitudinal direction of said fixed shaft, said output shaft and said helical gear being arranged on said fixed shaft, said hollow fixed shaft being fixed to said gear box via molding resin that is inserted into said gear box and said fixed shaft, wherein molding resin located in an interior portion of said hollow fixed shaft engages said resin of said gear box to fix said fixed shaft to said gear box.