Patent ID: 6358024
Filing Date: 2002-03-19
Classification: F02M,F04B

Abstract:
A high pressure fuel supply pump, comprising:a pump housing; a pump body fixed within the housing along a body axis and including a plurality of radially oriented plunger bores, each bore having a pumping plunger disposed therein for reciprocal radial motion; an actuating assembly disposed within the housing and around the plunger bores for producing said reciprocal motion by simultaneously driving the plungers radially inwardly during a pumping phase of operation and simultaneously retracting the plungers radially outwardly during a charging phase of operation; a central cavity extending along the axis and intersecting the pumping bores to form a pumping chamber in cooperation therewith; a feed fuel supply train including an inlet check valve biased to open and fluidly expose the plunger bores to a supply of feed fuel at relatively low pressure during the charging phase of operation and to seal against the supply of feed fuel during the pumping phase of operation; a high pressure outlet fitting fixed in the central cavity and including an internal valve cavity in fluid communication with the pumping chamber and extending along the axis; a discharge check valve biased to seal the valve cavity from the pumping chamber while the inlet check valve opens to deliver low pressure fuel to the pumping bores during the charging phase of operation and to fluidly expose the valve cavity to the pumping chamber during the pumping phase of operation; whereby during the pumping phase of operation, high pressure fuel is discharged from the pumping chamber through the outlet fitting substantially along said axis.