Final Drive and Speed Reduction | Shaft

Final drive is nothing but a mechanism used for providing a permanent speed reduction and to turn the driver of a vehicle as well. It comprises of a bevel pinion and a crown wheel or a wheel arrangement. The final drive assembly mounted and splined directly to the automatic transmission, consists of a pinion drive gear, a ring gear and a planetary gear train. The planetary gear train consists of a planet pinion carrier with three pairs of planet pinions, a sun gear and an Internal gear and performs the same function as the side gears and pinion gears in a conventional differential. It works as the torque from the final drive is transmitted to a right and left output shaft which connects to drive axles. The right output shaft is splined to the sun gear while the left output shaft is splined to the planet pinion carrier. Torque from the final drive is transmitted to a right and left output shaft which connects to drive axles. The right output shaft is splined to the sun gear while the left output shaft is splined to the planet pinion carrier.

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When it comes to turning, the left wheel starts to turn faster than the right wheel, torque from the transmission is transmitted to the drive pinion, then to the ring gear which is fastened to the case. The case contains an integral internal gear which drives the three outer pinions which are in mesh with and drive the three inner pinions. The three inner pinions being in mesh with the sun gear attempt to turn the sun gear at the same speed as the left wheel, but are prevented from doing so due to the friction between the right tire and the ground. This forces the planet pinions to walk around the sun gear, allowing the left wheel to rotate faster than the right wheel.

To keep the final drive running without any objections, we suggesting to check lubricant level at each engine oil change period. Maintain lubricant level to filler plug hole in the cover. Use only Gear Lubricant or equivalent. Always clean dirt or external material from around plug opening before removing filler plug.

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