초록 ▼

A hydraulically-actuated fuel injector includes an injector body that defines an upper actuation fluid cavity, a lower actuation fluid cavity, an actuation fluid inlet, a spill passage, a piston bore and a nozzle outlet. A control valve member is positioned in the injector body and moveable between

A hydraulically-actuated fuel injector includes an injector body that defines an upper actuation fluid cavity, a lower actuation fluid cavity, an actuation fluid inlet, a spill passage, a piston bore and a nozzle outlet. A control valve member is positioned in the injector body and moveable between a first position and a second position. An intensifier piston is positioned in the piston bore and moveable between a retracted position and an advanced position. The piston has a primary hydraulic surface exposed to fluid in the upper actuation fluid cavity, and an opposing hydraulic surface exposed to fluid in the lower actuation fluid cavity. The upper actuation fluid cavity is open to the actuation fluid inlet, and the lower actuation fluid cavity is open to the spill passage when the control valve member is in its first position. The spill passage is blocked when the control valve member is in its second position.

대표청구항 ▼

[ I claim:] [1.] 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

[ I claim:] [1.] 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.