Figure: Overdrive
Construction:
It consists of an Epicyclic gear train in which sun gear is free to rotate on the engine
shaft (input shaft) which is splined while the carrier can be slide. A free clutch is also
fitted on input shaft. The ring gear is mesh with the casing of the output shaft.
Working:
1.When the sun gear is locked with the casing i.e. it became stationary, the speed of the output shaft increase hence says as overdrive is engaged.
2.When the sun gear is locked with the carrier or ring gear, solid drive through the gear train is obtained.
3. Thus depending upon the locking of sun gear with casing or carrier the overdrive or direct drive is obtained.
4. There is another possible control of mechanism there is a direct drive through the free wheel clutch when engine develops the power
5. When accelerator pedal is brought to zero position and engine is idling, the output shaft will tends to override the input shaft.
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