Danfoss A/s

Sauer-danfoss Holding A/s

Uffe Lykke Eriksen

Welm Friedrichsen

A hydraulic drive for a vehicle has a pressure source ( ) generating a predetermined pressure for maintaining the operating pressure of a hydraulic motor ( ), a braking cylinder ( ) with a spring chamber ( ) comprising a spring arrangement ( ) for operating a braking arrangement ( ) and a release chamber ( ) that can be acted upon by pressurised fluid from the pressure source ( ) against the force of the spring arrangement ( ) with the purpose of retaining the braking device ( ) in its release position, and comprises a braking control valve ( ) that, in a release position, releases a flow from the pressure source ( ) to the release chamber ( ).

Vehicle hydraulic driving system

Hydraulic driving device with a hydraulic motor and a bearing arrangement in which the output shaft of the hydraulic motor is supported. Typically, the bearing arrangement is axially supported on the output shaft between a shoulder of the output shaft and a nut screwed onto the output shaft. To reduce overall length, the invention provides that the shoulder is located on the side of the bearing arrangement opposite from the end of the output side of the output shaft, and a friction-disc pack directly bears on the bearing arrangement. The motor has a braking device, including the friction-disc pack and at least one braking cylinder with a spring chamber and a release chamber. A braking valve in the braking position supplies the spring chamber with the load pressure and the release chamber with the tank pressure, and in the release position supplies the spring chamber with the tank pressure and the release chamber with the load pressure. The motor has a flushing line and a leakage line, which in one form of the invention are connected with the spring chamber and led to a tank via the braking valve. In another form of the invention, the leakage line is connected to the release chamber and the flushing line is connected to the spring chamber. In yet another form, the leakage line is connected to the spring chamber and the flushing line is connected to the release chamber. The combination of lines from the braking device and the flushing system results in simplifications.

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Silkeborg, Denmark

Uffe Lykke Eriksen