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