EP 0972936 A3 20000719 - Positive displacement pumps
Title (en)
Positive displacement pumps
Title (de)
Verdrängerpumpen
Title (fr)
Pompes volumétriques
Publication
Application
Priority
GB 9815272 A 19980714
Abstract (en)
[origin: EP0972936A2] 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
IPC 8 full level
F02M 59/06 (2006.01); F02M 59/10 (2006.01); F02M 59/44 (2006.01); F04B 1/04 (2006.01); F04B 9/04 (2006.01)
CPC (source: EP KR)
F04B 1/043 (2013.01 - EP); F04B 9/04 (2013.01 - KR); F04B 9/042 (2013.01 - EP)
Citation (search report)
- [XY] US 4687426 A 19870818 - YOSHIMURA HIROICHI [JP]
- [YA] GB 533961 A 19410225 - ARTHUR JOHN ROWLEDGE
- [A] US 2702008 A 19550215 - STOCKARD JOHN M
- [A] DE 19531873 C1 19961107 - DAIMLER BENZ AG [DE]
- [PA] EP 0856661 A2 19980805 - LUCAS IND PLC [GB]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0972936 A2 20000119; EP 0972936 A3 20000719; GB 9815272 D0 19980909; JP 2000038971 A 20000208; KR 20000016935 A 20000325
DOCDB simple family (application)
EP 99305492 A 19990712; GB 9815272 A 19980714; JP 20032299 A 19990714; KR 19990028389 A 19990714