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Home >> BMW >> 2013 >> 528i >> Repair and Diagnosis (Single Page) >> General Information >> OEM General Information >> Functional Description - F10 - Stability Control System, Tire & Wheel System, Lubrication System >> Lubrication System - Functional Description >> Oil-pressure control >> Characteristic-map-regulated oil pump

Characteristic-map-regulated oil pump

A familiar pendulum slide cell pump is used as the oil pump. The pump shaft for the supply is seated off-center in the housing and the vanes are displaced radially during rotation. This means that the vane chambers form different volumes. When the volume rises, the oil is taken in; when the volume decreases, oil is pressed into the oil ducts.

Fig 1: Identifying Regulated Oil Pump Related Components
G09910063Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Pump shaft
2 Rotational axis
3 Vane
4 Rotor
5 Pendulum slide
6 Control piston, pendulum support
7 Control spring
8 Compression spring
9 Control piston

The oil pump is driven by a chain from the crankshaft.