ENGINE COOLING SYSTEM AND MOTOR THEREFOR

摘要

A cooling module for an engine includes an electric motor and an impeller driven by the motor. The motor includes a stator having brush assemblies, and a rotor having a commutator. Each of the brush assemblies includes a brush holder, a brush slidably received in the brush holder, and a spring. The spring includes a mounting portion, a coiled portion and an elongated unrolled section joining the mounting portion to the coiled portion. The mounting portion is fixed to the brush holder and located closer to the commutator than the coiled portion. The coiled portion presses against a radially outer end of the brush to push the brush towards the commutator. The brush forms a concave for accommodating the coiled portion of the spring. The unrolled section is coiled into the coiled portion as the length of the brush is reduced.