Global Patent Index - EP 0972936 A2

EP 0972936 A2 2000-01-19 - Positive displacement pumps

Title (en)

Positive displacement pumps

Title (de)

Verdrängerpumpen

Title (fr)

Pompes volumétriques

Publication

EP 0972936 A2 (EN)

Application

EP 99305492 A

Priority

GB 9815272 A

Abstract (en)

A high pressure positive displacement pump, for example suitable for delivering fuel to a fuel injection system comprises one or more pumping assemblies (2,3,4). Each pumping assembly comprises a cylinder block (11) which defines a pumping cylinder (12) in which a pumping plunger (13) is slidably mounted. Each pumping plunger is connected to a tappet assembly (20) which comprises a tappet shell (21) slidably mounted in a bore (22). In use, the tappet assemblies engage a cam (6) to drive the pumping plungers in the pumping direction. A working fluid chamber (30) is defined on the side of each tappet assembly (20) opposite to the cam (6). In use, pressurised working fluid is delivered to the working fluid chamber (30) to drive the tappet and pumping plunger in the return direction. The arrangement obviates the need to provide a return spring for the pumping plungers. <IMAGE>

IPC 1-7

F04B 1/04

IPC 8 full level

F02M 59/10 (2006.01); F02M 59/06 (2006.01); F02M 59/44 (2006.01); F04B 1/04 (2006.01); F04B 9/04 (2006.01)

CPC

F04B 1/043 (2013.01); F04B 9/042 (2013.01)

Designated contracting state (EPC)

DE ES FR GB IT

DOCDB simple family

EP 0972936 A2 20000119; EP 0972936 A3 20000719; GB 9815272 D0 19980909; JP 2000038971 A 20000208; KR 20000016935 A 20000325