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Gearbox

Gearbox


The automatic transmission consists of 3 planetary gear trains with clutches, brakes and freewheels. It has twin shafts (primary and secondary). Two of the three planetary gear trains, P1 and P2, constitute the transmission's primary shaft. The rear planetary gear train (P1) is a single planet gear and the front one (P2) has a double set of planet gears. The outer one consists of the short planet gears and the inner of the long ones. the inner planet gears and the sun wheel shaft are common to P1 and P2.

The secondary shaft consists of planetary gear train P3, which is single.

The power from the primary shaft is transmitted to the secondary shaft via two intermediate gears. From the secondary shaft the power is then transmitted to the final drive via two final drive pinions, one driving and one driven.

The transmission has 4 forward gears and one reverse.

There is normally some degree of slip in the torque converter. This is p roportional to the increase in torque that is generated. To reduce fuel consumption, a Lock-up clutch in the torque converter eliminates the slip in 3rd and 4th gears when it is engaged by providing direct drive through the converter.