The e-Varioserv® power steering pump supplies exactly the right amount of oil that is needed for operating hydraulic steering systems in commercial vehicles.
Full performance with minimal power consumption
The e-Varioserv® power steering pump is designed for connection to the air compressor or a power take-off on the engine. The shaft connects by means of a cross-slotted disk or spline toothing.
The e-Varioserv® consists of a housing with an integrated control valve, cover, front plate, shaft, and rotor set as well as an ECO (electronically controlled nozzle). The ECO enables a demand-driven lowering of the volume flow depending on the vehicle-specific requirements.
The rotor set is comprised of a rotor, eleven radially-guided blades as well as an eccentrically-mounted and hydraulically-adjustable cam ring and an outer ring.
The e-Varioserv® behaves like a conventional power steering pump up to a defined control point. As soon as this control point is reached, the geometric delivery volume is reduced by the cam ring adjustment. In addition, the volume flow is also reduced by the ECO valve.
The ECO valve is controlled depending on the vehicle-specific requirements. This lower delivery volume compared to a Varioserv® pump leads to a further decrease in power consumption and thus a lower system temperature.
Details about the
e-Varioserv® power steering pump
|Displacement volume (cm³/rev)||25|
|Max. rotational speed (rpm)||5,000|
|Max. pressure (bar)||185|
|Controlled volumetric flow (dm³/min)||5/25|
|Suction port||1 1/16“ – 12UN 2B|
|Thread (pressure port)||M26 x 1.5|
|Pressure port||5/8“ – 18UNF 2B|
|Thread (pressure port)||M16 x 1.5|
|Drive direction of rotation||clockwise or counter-clockwise|