ADJUSTING UNIT FOR AN AXIAL PISTON MACHINE
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United States of America Patent
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Issued Date -
Oct 9, 2008
app pub date -
Apr 4, 2008
filing date -
Apr 4, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention relates to an adjusting unit for an axial piston machine, having a valve unit for controlling the oil pressure which loads a servo system, the valve unit having a substantially cylindrical valve slide which can be displaced along its centre longitudinal axis in the valve unit. On both sides of a plane of symmetry which is perpendicular with respect to the centre longitudinal axis, the valve slide has flattened portions which extend on the cylindrical outer cover parallel to the centre longitudinal axis and are delimited by control edges, as a result of which the connections to the two servo sides are controlled in such a way that, in a centred neutral position of the valve slide, the servo system is put into neutral and, when the valve slide is displaced from its centred neutral position, a different hydraulic pressure acts on the two servo sides which displaces the servo piston or the servo pistons correspondingly. A groove which reinforces the self-centring action is sunk in the flattened portions of the valve slide in the region of the respective control edge which lies to the side of the plane of symmetry.
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