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Home >> Land Rover >> 2017 >> Discovery Sport SE >> Repair and Diagnosis >> Drivelines & Axles >> Driveshaft & Universal Joints >> Four-Wheel Drive Systems - Vehicles With: Active Driveline -- Discovery Sport/L550 >> Four-Wheel Drive Systems - Vehicles With: Active Driveline >> Description And Operation >> Four-Wheel Drive >> Operation >> Power Transfer Unit (PTU)

Power Transfer Unit (PTU)

The Active Driveline Power Transfer Unit (PTU) input shaft is driven directly from the transmission differential. When the hydraulically operated triple cone synchronizer is in the disengaged position (B in the following illustration), the crown wheel shaft and the crown wheel is disconnected from the input shaft and no drive is transferred to the driveshaft or the Rear Drive Unit (RDU).

When the triple cone synchronizer is engaged (A in the following illustration), drive is transferred from the transmission differential, through the synchronizer to the crown wheel shaft. The crown wheel rotates and transmits the drive through 90 degrees to the pinion gear and the drive flange to rotate the driveshaft.

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