After the engine is started, the flywheel drives the drive gear to rotate. Because the flywheel will drive the drive gear to rotate at a high speed and is much higher than the rotation speed of the armature, it can be considered that the flywheel is active and the armature shaft is passive, that is, the drive gear is active and the outer race is passive.
In this case, the tail of the drive gear will drive the rollers to overcome the spring force, causing the rollers to roll toward the wider side of the wedge-shaped chamber. As a result, sliding friction occurs between the rollers at the tail of the driving gear and the outer race, and only the driving gear rotates with the flywheel, and the power of the engine cannot be transmitted to the armature shaft, which plays the role of automatic separation. At this time, the armature shaft is only idling at its speed, avoiding the danger of overspeeding.
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