FUEL PUMP WITH AN IMPROVED MAXIMUM-PRESSURE VALVE FOR A DIRECT-INJECTION SYSTEM

FUEL PUMP WITH AN IMPROVED MAXIMUM-PRESSURE VALVE FOR A DIRECT-INJECTION SYSTEM

Fuel pump (1) for a direct-injection system and having: a pumping chamber (14); a piston (15); an intake channel (17) regulated by an intake valve (18); a delivery channel (22) regulated by a delivery valve (23); and a drain channel (32) that originates in the delivery channel (22) and is regulated...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: DE VITA, Daniele, NERI, Tommaso
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ACTUATING-FLOATS
BLASTING
COCKS
COMBUSTION ENGINES
DEVICES FOR VENTING OR AERATING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF
TAPS
THERMAL INSULATION IN GENERAL
VALVES
WEAPONS
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Beschreibung
Zusammenfassung:Fuel pump (1) for a direct-injection system and having: a pumping chamber (14); a piston (15); an intake channel (17) regulated by an intake valve (18); a delivery channel (22) regulated by a delivery valve (23); and a drain channel (32) that originates in the delivery channel (22) and is regulated by a maximum-pressure valve (33) having: a shutter (34), a valve body (36) provided with a valve seat (35), a calibrated spring (38) for pushing the shutter (34) against the valve seat (35), and a plate (39) that is arranged in contact with the shutter (34) on the opposite side of the valve seat (35); the plate (39) of the maximum-pressure valve (33) has a first annular groove (42), which is arranged around the shutter (34); and the valve body (36) of the maximum-pressure valve (33) has a second annular groove (43), which is arranged around the shutter (34) and at least partially faces the first annular groove (42) of the plate (39).