Patent ID: 7362030

Claim:
A brush type small DC motor having a brush urging spring device, the brush urging spring device comprising a brush holder, a coil spring having a linear spring property inserted into the brush holder, and a brush having a connecting portion for connecting the brush and the coil spring, the brush holder being formed of side plates arranged in the upstream and downstream sides in a rotary direction of the motor, an axial side plate, a spring receiving plate, and a side surface of a bracket, a distance between the side plates of the brush holder being set a little larger than an outer diameter of the coil spring, so that the coil spring is movable freely in the brush holder, a distance between the axial side plate of the brush holder and the side surface of the bracket being set about 1.5 to 2 times larger than the outer diameter of the coil spring, sand a length of the brush holder being set smaller than a free length of the coil spring, wherein the coil spring is deformed and a non-linear spring property is obtained when the coil spring is urged by the brush urging spring device.