Robert Boschgmbh

Peter Loewe

Heinz-Gerhard Essig

Thomas Froehlich

Michael Schuette

A hydraulic drive device includes a pump, a hydraulic machine, and a tank. The hydraulic machine is connected fluidically to first and second fluid lines, which are configured to be connected fluidically to the tank or the pump via an adjustable main valve. The device further includes a first valve with a continuously adjustable first orifice. Pressure fluid is configured to be conducted out of the second fluid line via the first orifice and into the tank. The first valve is acted upon in the closing direction of the first orifice by a first spring and acted upon in the opposite direction by the pressure at a control point. The control point is connected fluidically to the tank via a first throttle device, connected via a second throttle device to the first fluid line, and connected to the first fluid line via a third throttle device and a second valve.

Hydraulic drive device with load-dependent pressure distributor

A hydraulic pump includes an adjustment device configured to adjust a delivery volume. The adjustment device is configured to be connected via a shuttle valve to a control pressure supply and to a working line. The working line is supplied by the hydraulic pump. The adjustment device is configured to be alternately supplied with control pressure by the control pressure supply and by the hydraulic pump. The hydraulic pump also includes a nozzle. The nozzle is configured to connect the working line to the control pressure supply in a zero stroke operating mode. The nozzle is formed in or on a valve body of the shuttle valve.

Adjustable hydraulic pump

The invention relates to a hydrostatic multi-motor drive () with a hydraulic pump () and at least one first pair of hydraulic motors. The two hydraulic motors () of the first pair of hydraulic motors are connected to one another in series by means of a first working line section (). A bypass line () is provided which connects a first connection () of the hydraulic motor (), which is upstream in relation to a volumetric flow generated by the hydraulic pump (), to a second connection () of the downstream hydraulic motor (). A first valve unit () which interrupts the first bypass line () is arranged in the bypass line (). A first minimum pressure maintaining device () for maintaining a minimum pressure at the upstream connection () of the downstream hydraulic motor () is also arranged in the bypass line ().

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Burgrieden, Germany

Peter Loewe