Miniature motor

A miniature motor comprising a case made of a metallic material, formed into a bottomed hollow tubular shape, and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor comprising an armature facing said permanent magnet and a commutator, and a case cap fitted to an open end of said case, and having brushes making sliding contact with said commutator and a pair of input terminals electrically connected to said brushes one of directly and via other electrically conductive members said rotor being rotatably supported by bearings provided on the bottom of said case and said case cap, characterized in that lanced structure formed from the group of a lanced and raised lug, and lanced and raised projections, are provided near tips of legs of a retaining member made of an electrically conductive material;

• retaining parts are formed by bending the tips of said retaining member legs to the same side as said lanced structure;
• and the size of a gap between a projection provided on a surface of said input terminals and a surface of said lanced structure of said retaining member in free state is made smaller than the thickness of a positive temperature coefficient resistor so that said positive temperature coefficient resistor can be inserted into said gap, and when said positive temperature coefficient resistor is moved in extracting direction, said lanced structure cuts into the surface of electrodes of said positive temperature coefficient resistor;
• a tip of said retaining member leg is formed into a fork shape by dividing into at least two prongs, with a lanced structure provided on any one prong, and a retaining part is formed by bending another prong to the same side as said lanced structure.