Bosch Rexroth Ag

Dana Rexroth Transmission Systems

Dana Rexroth Transmission Systems S.r.l.

Walter Scandella

Steffen Mutschler

Matthias Mueller

Erhard Bergmann

Edwin Harnischfeger

Vincenzo Domenico Bollero

A power-split transmission for a traction drive includes a hydraulic power branch and a further power branch. In order to control a velocity, a displacement volume of a hydraulic pump of the hydraulic power branch is configured to be adjusted by a hydraulic actuating device. For the purpose of adjustment, a control pressure medium can be applied to the actuating device by a control valve. An additional pressure-control device is configured to be used to set a control pressure of the control pressure medium to a setpoint value which is dependent on a drive range of the transmission or of the traction drive.

Power-split transmission for a traction drive and method for controlling the transmission

A hydraulic steering apparatus with steering amount amplification is provided, wherein a metering device for supplying pressure medium to steering cylinders is actuated in accordance with an amount of rotation of the steering wheel. With the aid of a control block it is possible to deliver an additional pressure medium volume to the steering cylinders, wherein control of the control block is effected through the intermediary of a control circuit containing an effective control pressure that is substantially lower than the load pressure for transmitting the steering moment at the steering cylinder. A spring assembly for the control block is also provided, wherein two springs are arranged in parallel, one of which only takes effect following a predetermined stroke of the control element.

Hydraulic steering apparatus

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Bergamo, Italy

Walter Scandella