Brueninghaus Hydromatik Gmbh

Jochen Beck

Dieter Roth

Werner Hormann

Disclosed is a hydraulic steering system () for a vehicle, especially a mobile working machine, comprising at least two steering cylinders () within which two cylinder pistons () can be displaced, and a first hydraulic pump () that can be adjusted regarding the swept volume. The position or the direction of displacement of the cylinder pistons () in the steering cylinders () defines the steering angle or the steering direction of the steerable vehicle wheels relative to a body () of the vehicle. The displaceable cylinder pistons () divide the associated steering cylinder () into two respective pressure chambers (andand). The first connection () of the adjustable hydraulic pump () is joined to one of the pressure chambers (oror) of the two steering cylinders () according to the steering direction while the second connection () thereof is joined to the other respective pressure chamber (oror) of the two steering cylinders () in a closed circuit.

Hydraulic system

The invention relates to a hydrostatic vehicle drive system () comprising a first and a second hydraulic pump (), and a first and a second hydraulic motor (). Said hydraulic pumps () and said hydraulic motors () are coupled in such a way in a differential lock operation that a first connection () of the first hydraulic pump () is connected to a first connection () of the first hydraulic motor (); a second connection () of the first hydraulic motor () is connected to a first connection () of the () of the second hydraulic pump (); a second connection () of the second hydraulic pump () is connected to a first connection () of the second hydraulic motor (); and a second connection () of the second hydraulic motor () is connected to a second connection () of the first hydraulic pump (). The absorption volume of the first hydraulic motor () and the second hydraulic motor () can be respectively adjusted by means of an adjusting device ().

Hydrostatic vehicle drive system comprising a differential lock

Hydrostatic propulsion drive

The invention relates to a hydrostatic machine, in particular axial piston machine, having a machine housing the internal housing chamber of which accommodates a drive mechanism rotatably mounted by means of at least one bearing and has a leakage oil chamber opening to the outside via at least one leakage oil connection. To avoid splash losses of the hydrostatic machine, in accordance with the invention a pump device (29; 50; 60; 70) is arranged in the internal housing chamber in driving connection with the drive mechanism (3, 4, 7), which device is provided to pump leakage oil out of the leakage oil chamber (28) through the leakage oil connection (8, 37; 72) to the outside.

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Elchingen, Germany

Jochen Beck