公开(公告)号：WO2012116959A1

公开(公告)日：2012-09-07

申请号：PCT/EP2012/053284

申请日：2012-02-27

Applicant: DELPHI TECHNOLOGIES HOLDING S.A.R.L. ,  McHATTIE, James ,  GARLAND, Paul

Inventor： McHATTIE, James ,  GARLAND, Paul

IPC: F02M59/20 ,  F02M59/26 ,  F02M59/34 ,  F02M59/46

CPC classification number: F02M59/34 ,  F02M59/205 ,  F02M59/462 ,  F02M2700/1352

Abstract: A pumping head for a high-pressure fuel pump is disclosed in which the number of high-pressure fuel seals required is minimised. The pumping head comprises a head housing (101; 201) including a first bore (106) and an integral outlet port (128) defining a second bore (112), a pumping element (104) slidably received in the first bore (106) and arranged for reciprocal linear movement along a pumping axis (A), a pumping chamber (110) defined in part by the pumping element (104) and in part by the first bore (106), inlet means (130; 230) for delivering fluid at relatively low pressure to the pumping chamber (110) during a return stroke of the pumping element, and outlet means (114) for receiving fluid at relatively high pressure from the pumping chamber (110) during a forward stroke of the pumping element and for delivering the relatively high-pressure fluid through the outlet port (128). The outlet means comprises a passage (124) defined in the housing (101) that opens into the pumping chamber (110), the passage (124) being substantially coaxial with the pumping axis (A), and an outlet valve (114) for controlling the flow of fluid from the pumping chamber (110) along a fluid flow path (121, 123) substantially parallel to the pumping axis (A). The outlet valve (114) comprising a valve body (116) received in the second bore (112), and a valve seat (126) defined by the housing (101) at an end of the passage (124). Preferably, the pumping element (104) cooperates with the inlet means (130; 230) to restrict the flow of fluid between the inlet means (130; 230) and the pumping chamber (110) during at least a part of the forward stroke so that the inlet means is not exposed to the relatively high-pressure fluid.

Abstract translation: 公开了一种用于高压燃料泵的泵头，其中所需的高压燃料密封件的数量被最小化。 所述泵头包括头壳体（101; 201），所述头部壳体包括第一孔（106）和限定第二孔（112）的整体出口（128），可滑动地容纳在所述第一孔（106）中的泵送元件（104） 并且布置成沿着泵送轴线（A），部分由所述泵送元件（104）限定并且部分地由所述第一孔（106）限定的泵送室（110）的往复线性运动，用于输送的入口装置（130; 230） 在泵送元件的返回冲程期间在泵送室（110）处的相对低的压力下的流体和用于在泵送元件的向前冲程期间从泵送室（110）接收流体的出口装置（114） 用于通过出口（128）输送相对高压的流体。 所述出口装置包括限定在所述壳体（101）中的通向所述泵送室（110）的通道（124），所述通道（124）与所述泵送轴线（A）基本上同轴;以及出口阀（114） 控制来自泵送室（110）的流体沿着基本上平行于泵送轴线（A）的流体流动路径（121,123）的流动。 出口阀（114）包括容纳在第二孔（112）中的阀体（116）和在通道（124）的端部处由壳体（101）限定的阀座（126）。 优选地，泵送元件（104）与入口装置（130; 230）协作以在前进冲程的至少一部分期间限制入口装置（130; 230）和泵送室（110）之间的流体流动，从而 入口装置不暴露于相对高压的流体。