Controlled oil pumps

The controlled pendulum-slider oil pump from MAHLE represents an innovation in liquid management. Its high efficiency and smart, demand-based supply of oil pressure and volume offer great potential in terms of reducing CO₂ emissions and fuel consumption. This translates to a potential CO₂ reduction in the New European Driving Cycle (NEDC) of up to two percent compared with a conventional oil pump.











In contrast to the controlled external-gear pump and the controlled vane pump, the design of the pendulum-slider pump provides the following advantages, in particular:

• The high volume efficiency and low friction of the pump yield a greater overall efficiency of 65 to 70 percent in the operating point. In the relevant operating range of a vehicle, the volumetric efficiency is even greater than 92 percent, or significantly higher than with other pump technologies available today.

• The pendulum-slider pump is extremely robust and can withstand dirt and abrasive particles. Due to their position in the outer rotor, the pendulums are protected from excessive wear. Unlike the external-gear pump and vane pump, the pendulum-slider pump retains a high level of efficiency during the engine’s entire service life.
• In addition to its excellent reliability, the pump stands out due to its versatility. Owing to its delivery pressure and displacement volume, it can be used in an extremely wide range of applications. Moreover, the pendulum-slider principle allows immediate delivery of the required pressure. In addition to its use in combustion engines, other possible applications include manual transmissions, steering gears, active chassis, retarders, and even straight hydraulic systems.

• Add to this the fact that the pendulum-slider oil pump can be positioned flexibly in various locations. Depending on its installation size, it is capable of operating at a wide range of speeds up to 14,000 rpm. In an engine, the pump can be driven with a chain, directly by the crankshaft or directly by the balance shaft. This enables it to be installed in various positions in the engine.
• Despite its technical superiority, the volume-flow-controlled pendulum-slider pump is more ccompetitive than the controlled vane pump. Compared to the controlled gear pump, it also provides a considerable cost benefit, in addition to superior technology.