Zf Friedrichshafen Ag

Armin Thiele

Martin Brehmer

Klaus Steinhauser

Peter Schiele

Carl Schilling

Markus Gentner

A transmission device () has a double-flow sliding vane pump (). Hydraulic fluid is supplied to suction sides (A,B) of the pump () through an inlet area () from a hydraulic fluid reservoir () and from a suction loading () via an annular chamber () and pump inlets (). The annular chamber () is delimited by the cam ring () and a housing () enclosing the cam ring (). A sealing gap () extends in the circumferential direction (U) between one of the pump inlets () and a circumferential area () of the cam ring () delimiting the inlet area () from the hydraulic fluid reservoir (). Courses () of the inlet area () and of the suction loading () installed in the transmission device () respectively form a first angle (&#x3b1;) and a second angle (&#x3b2;) with the vertical axis () of the transmission device ().

Transmission with double-flow sliding vane pump

A process for actuating a hydraulic storage device () of a transmission unit comprising a storage space () whose volume can be varied between a minimum and a maximum. The volume of the storage space can be changed by acting upon the storage space with pressurized hydraulic fluid from a pressure supply () of the transmission unit. To overcome a restoring tendency of the hydraulic storage device, the pressure is set to a threshold value. A holding device () holds the hydraulic storage device at least in the operating condition that corresponds to the maximum volume of the storage space against the restoring tendency. The storage space is acted upon by the pressure supply with a pressure corresponding to a threshold value (P_threshold) until the hydraulic storage device reaches the operating condition in which it can be held by the holding device.

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Tettnang, Germany

Armin Thiele