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Ravigneaux gear set
Ravigneaux gear set is a combination of two incomplete planetary gear set
It wqas invended by Pol Ravigneaux in 1949 france
IT has two sets of ring gear, a large and small ring gear and single planet carrier holding two sets of planetary gears
Single sun gear Low and high planet gears Common planet carrier Two ring gears
components
1) When Large ring gear held still
Large ring gear is braked
Small ring gear drive the Planetary gears.
With a large step down ratio at planetary carrier
Operation of Ravigneaux gear set
2)When Sun gear is held still
Sun gear is braked
Again small ring gear drive planetary gears
As a result there is asmall step-down at planet carrier
3) When Sun and Ring gear is held still When sun gear and ring gear is braked
IT lock entire gear set
As a result hole unit rotate at a same speed
Transmission ratio here is 1