Patent ID: 6481550
Filing Date: 2002-11-19
Classification: E05F,E05Y,F16D,H02K

Abstract:
A motor comprising:an oblate motor main body having a rotatable shaft; an output unit having a housing and a worm shaft, said housing being secured to said motor main body, said worm shaft being supported within said housing; and a clutch arranged between said rotatable shaft and said worm shaft, said clutch transmitting rotation of said rotatable shaft to said worm shaft and preventing transmission of rotation of said worm shaft to said rotatable shaft, said clutch including: a driving-side rotator arranged to rotate integrally with said rotatable shaft; a generally cylindrical collar secured to said housing; a driven-side rotator arranged to rotate integrally with said worm shaft, said driven-side rotator being located within said collar in a coaxial manner with respect to said driving-side rotator and having at least one control surface, each of said at least one control surface being spaced from said collar for a distance that varies in a circumferential direction of said collar, said driven-side rotator being drivingly engageable with said driving-side rotator in a rotational direction; at least one rolling element, each of said at least one rolling element being arranged between said collar and a corresponding one of said at least one control surface, said each of said at least one rolling element being rotated together with said driven-side rotator when said driving-side rotator is rotated, said each of said at least one rolling element being clamped between said collar and said corresponding one of said at least one control surface to restrain rotation of said driven-side rotator when said driven-side rotator is rotated; a support member rotatably supporting said at least one rolling element; and a stopper secured to said housing, said stopper restraining axial movement of said at least one rolling element by restraining axial movement of said support member to retain said at least one rolling element within said collar.