Patent ID: 6047899
Filing Date: 2000-04-11
Classification: F02M

Abstract:
A hydraulically actuated fuel injector comprising:an injector body defining a first actuation fluid cavity, a second actuation fluid cavity, an actuation fluid inlet, a spill passage, a piston bore and a nozzle outlet;a control valve member positioned in said injector body and being movable between a first position and a second position;an intensifier piston positioned in said piston bore and being movable between a retracted position and an advanced position, and said piston having a primary hydraulic surface exposed to fluid in said first actuation fluid cavity, and an opposing hydraulic surface exposed to fluid in said second actuation fluid cavity;said first actuation fluid cavity being open to said actuation fluid inlet, and said second actuation fluid cavity being open to said spill passage when said control valve member is in said first position; andsaid spill passage being blocked when said control valve member is in said second position.