Pic. 9.8. Power window front door: 1 - front door glass; 2 - screw; 3 - top seal; 4 - outer seal; 5 - protective plate of the sliding glass; 6 - clip of the sliding glass; 7 - sliding glass mounting plate; 8 - nut; 9 - power window motor reducer; 10 - roller; 11 - cable
Cars are equipped with electric windows for lowering and raising the windows of the front doors (pic. 9.8). In the window regulator mechanism, instead of the gear reducer used in mechanical window regulators, there is only a drum, into the hole of which the output shaft of the gearmotor is inserted. The geared motor consists of a worm gear and a DC motor with permanent magnet excitation. The gear motor is reversible, the direction of rotation of the output shaft depends on the direction of the current in the armature winding. For protection against overloads, it is equipped with a built-in thermal bimetallic fuse.
The gearmotors are switched on by switches located on the handles of the armrests.