公开(公告)号：US10309390B2

公开(公告)日：2019-06-04

申请号：US14452112

申请日：2014-08-05

Applicant: Danfoss Power Solutions Inc.

Inventor： Peter Zavadinka ,  Stanislov Smolka ,  Pavol Sedo

IPC: F04B1/32 ,  F04B49/00 ,  F04B49/08 ,  F04B49/12

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.