Wirtgen Gmbh

Sebastian Drumm

Christian Berning

Tobias Stinner

Burkhard Frank

A road milling machine includes a machine frame, at least three travelling devices, a milling drum, and at least one hydraulic drive system. The hydraulic drive system includes at least one hydraulic pump, at least one hydraulic fixed displacement motor for driving at least one driven travelling device, and one each hydraulic variable displacement motor for driving the remaining travelling devices. A first gearbox is arranged between the fixed displacement hydraulic motor and its associated travelling device. One each second gearbox is arranged between each of the hydraulic variable displacement motors and their associated travelling devices. The transmission ratio of the first gearbox is lower than the transmission ratios of the second gearboxes and/or the displacement volume of the fixed displacement motor is smaller than the maximum displacement volume of the variable displacement motors.

Self-propelled construction machine

In a self-propelled construction machine (), in particular road milling machine, comprising a machine frame (), at least three travelling devices (), wherein at least one of the three travelling devices () is realized as a pivotable travelling device () so that said travelling device () is pivotable about at least one vertical pivoting axis in relation to the machine frame () between a first pivoted-in and at least one second pivoted-out position, at least one working device (), in particular a milling drum, for working the ground pavement (), at least one hydraulic drive system () for driving at least two travelling devices (), wherein at least one of the at least two driven travelling devices is the pivotable travelling device (), wherein the hydraulic drive system () comprises at least one hydraulic pump (), it is provided for the following features to be achieved: the hydraulic drive system () comprises one each hydraulic variable displacement motor () for driving the driven travelling devices () with the exception of the at least one pivotable travelling device (), wherein the hydraulic drive system () comprises a hydraulic fixed displacement motor () for driving the at least one pivotable travelling device ().

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Rösrath, Germany

Sebastian Drumm