| 摘要 |
<p>In an electric motor comprising a stator, a rotor with a rotor shaft and a commutator with brushes on one end of the rotor shaft, which end is journalled in a bearing, in order to inhibit the entry of contaminants into the bearing and the consequent reduction in the life of the bearing, if parts of the bearing and the commutator are provided with relatively rotatable parts which cooperate with one another to form a dust seal for the bearing.</p> |
