Control unit for hydraulic variable displacement pumps and variable displacement pump with a control unit
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United States of America Patent
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Jun 4, 2019
Grant Date -
Feb 19, 2015
app pub date -
Aug 5, 2014
filing date -
Aug 19, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Control device for hydraulic variable displacement pumps operated in an open hydraulic circuit and adjustable in their displacement volume by means of a servo control device. The control device comprises a control piston with two control edges to which pressure can be applied by means of pressurized pressure fluid from a variable displacement pump, the control piston being mounted in a housing so that it shifts longitudinally. The housing of the control piston comprises an inlet for the connection of a high pressure line of a variable displacement pump, an outlet which can be connected to a tank and a servo connection which can be linked to a servo cylinder, whereby a link between the inlet and the servo connection can be made via a first control edge. It is possible to create a link between the servo connection and the outlet via a second control edge.
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