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专利名称：POSITIVE-DISPLACEMENT PUMP发明人：MERZ, JOHANN申请号：EP965622.8申请日：19981009公开号：EP1025363B1公开日：20020904
摘要：The invention relates to a positive-displacement pump to feed pressurized fluidfrom a container to a consumer, especially to the power steering system of a motorvehicle, wherein a pump package (2) with a rotor (3), a cam ring (4) and several sliders (5)is arranged inside a housing (1). A bypass flow regulating valve (11) with a piston (11A) isused to regulate the useful flow. A throttle of the bypass flow regulating valve (11) isformed by a diaphragm (12) that is fixed to the housing and which has an adjustable crosssection area. Said cross section area of the diaphragm (12) becomes larger when thepressure exerted on the diaphragm (12) is increased. The diaphragm (12) is arranged insuch a way that it cannot be displaced in relation to the housing (1). The piston can onlybe displaced by the force of a spring (15) when pressure is exerted on the diaphragm (12)so that the cross section area of the diaphragm (12) can change depending on thepressure being exerted. The piston is advantageously shaped as a control rod (13) whichcan be displaced in relation to the diaphragm (12) and independently from the piston(11A) of the bypass flow regulating valve (11). This enables the feed flow to be regulatedeven at low rotational speeds.
申请人：ZF FRIEDRICHSHAFEN AKTIENGESELLSCHAFT,ZAHNRADFABRIKFRIEDRICHSHAFEN,ZF FRIEDRICHSHAFEN AKTIENGESELLSCHAFT
地址：DE
国籍：DE
代理机构：Wiechmann, Manfred
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