Danfoss Power Solutions Gmbh & Co Ohg

Sauer-Danfoss Inc.

Peter Bahna

Reinhardt Thoms

Andrej Babusa

Suenje Marsch

Heiko Laffrenzen

Miroslav Chmatil

Sebastian Bujna

Peter Chlebana

Michael Knazek

Manual displacement control device (MDC) for hydraulic units has an input shaft mounted rotatably about an input shaft axis in an input shaft block. The input shaft protrudes from the input shaft block with a first end, onto which a rotating torque can be applied. The MDC further includes a control spool housed in a control housing, which is moveable by rotating the input shaft for controlling a servo pressure. The control device is configured for adjusting and fixing the lateral position of the input shaft with respect to the control housing in a direction perpendicular to the input shaft axis and perpendicular to the direction of a restoring force exerted on the input shaft.

Neutral setting device of an adjustable hydraulic unit

Manual displacement control device (MDC) for hydraulic units has an input shaft mounted rotatably about an input shaft axis in an input shaft block. The input shaft protrudes from the input shaft block with a first end, onto which a rotating torque can be applied. The MDC further includes a control spool housed in a control housing, which is moveable by means of rotating the input shaft for controlling a servo pressure. The control device has positioning means for adjusting and fixing the lateral position of the input shaft with respect to the control housing in a direction perpendicular to the input shaft axis and perpendicular to the direction of a restoring force exerted on the input shaft. The hydraulic unit is adjustable to its neutral position by means of a servo spring bracket providing an end stop surface for a servo spring seat towards the displacement element. The servo spring bracket is variably fixable to the hydraulic unit housing in a manner so that the orientation of the end stop surface can be adjusted parallel to the neutral position of the displacement element.

The invention is directed to a swashplate angle sensor () for a variable displacement hydraulic unit (). The hydraulic unit () comprising a housing (), within which a swashplate () with a rod shaped feedback-link () fixedly attached to the swashplate () is arranged pivotable around a swashplate axis (). The angle sensor () comprising a magnet () mounted rotatable on a magnet carrier (), and a sensor () for sensing the orientation of the magnet (). The magnet carrier () is located in a control block () attached to the housing () and is located parallel to the feedback-link (). The magnet carrier () is rotatable around a sensor axis () being parallel to the swashplate axis (). A linkage spring () provides a connection between the feedback-link () and the magnet carrier () such that a pivoting of the swashplate () with the feedback-link () causes a rotation of the magnet carrier ().

Swash plate angle sensor

The invention relates to a neutral setting apparatus for adjustable hydraulic machines, in particular the adjustment of the neutral position of a servo valve. In particular, the invention relates to servo adjustment devices with mechanically adjustable control pistons, wherein the forces necessary for this can be applied mechanically, electro-magnetically, pneumatically or hydraulically. The invention relates to a neutral setting apparatus of an adjustable hydraulic machine, with a housing in which a mounted input shaft is arranged, to one end of which a torque can be applied for rotating the input shaft about an axis. Thus providing a robust and cost-effective setting mechanism for the neutral position of a servo valve.

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Pruzina, Slovakia

Peter Bahna