|
Click on the appropriate button in the illustration. |
| (3) |
Disengagement mechanism
|
When the pinion gear rotates the ring gear, a high pressure is applied to the tooth surfaces of both gears.
When the rotational speed of the ring gear (engine) becomes greater than the rotational speed of the pinion gear (starter), such as when the engine starts, the ring gear (engine) attempts to rotate the pinion gear (starter).
A small part of this rotational force is converted into a thrust force by the helical spline to assist in disengaging the pinion gear, however, the overrunning clutch mechanism prevents all the rotating force of the ring gear (engine) from being transmitted to the starter assembly by allowing the ring gear to freely rotate the pinion gear. As a result, the pressures applied to both the gears decrease, and the pinion gear is more easily disengaged.
As the pull-in coil (magnetic) force from the magnetic switch is no longer applied, the compressed return spring pushes the pinion gear back, disengaging it from the ring gear. |
|
