Mechanical Function, Overview
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.
- Pressure plate
- Rollers for the annular piston
- Rollers for the operating piston
- Annular piston
- Operating piston
- Input shaft
- Cam disc
- Housing for the outer plates
- Outer plates
- Inner plates
- Springs
- Output shaft.
The gearbox transfers engine torque to the propeller shaft. The input shaft is separate from the output shaft. The multi-plate clutch in the coupling must be engaged to transfer torque to the rear axle. The inner and outer wet multi-plate clutch are the transfer point between the input and output shafts.
The sinusoidal cam disc rotates at the same speed as the propeller shaft. The annular piston rollers act on the cam disc to press the annular piston in and out. This creates an oil pressure which affects the operating piston, which in term engages the multi-plate clutch unit.