Oil Pump

Courtesy of VOLVO CARS CORPORATION

The oil pump is a vane pump where displacement can be varied steplessly as necessary. The oil pump is driven by the crankshaft via a chain. The chain is tensioned via a mechanical chain tensioner.

Courtesy of VOLVO CARS CORPORATION

1. Setting ring - vane pump
2. Inner ring - vane pump
3. Vanes (total of 6)
4. Pressure spring

Variable oil pump 

The oil pump is a vane pump where displacement can be continuously varied as necessary. Depending on the engine temperature, engine speed and torque output, the oil pump is controlled to an optimal pressure. Thereby, the power consumption from the oil pump can decrease, which eventually contributes to a reduction of fuel consumption and exhaust emissions.

The main component in the variable oil pump consists of a vane pump with an adjustable outer ring. Displacement of the pump changes according to the outer ring position. In its original position the pump produces its maximum flow and thus oil pressure, while when fully regulated it produces a reduced flow/pressure.