초록 ▼

An actuator and valve assembly for a hydraulically-actuated electronically-controlled unit injector is disclosed which comprises an electrically-energizable actuator including a movable member and a poppet valve connected to the movable member. The poppet valve has a first seat and a second seat and

An actuator and valve assembly for a hydraulically-actuated electronically-controlled unit injector is disclosed which comprises an electrically-energizable actuator including a movable member and a poppet valve connected to the movable member. The poppet valve has a first seat and a second seat and is movable along an axis between first, second and third positions. The assembly further comprises a device for biasing the poppet valve towards its first position and a device for accommodating misalignment of the first and second seats relative to the axis. The poppet valve is advantageous because it has high fluid flow control capability in a one-piece single-stage configuration.

대표청구항 ▼

An actuator and valve assembly adapted for a hydraulically-actuated electronically-controlled unit injector comprising: an electrically-energizable solenoid assembly including a movable armature; a poppet adapter defining a bore and a drain passage, said drain passage communicating with the poppet a

An actuator and valve assembly adapted for a hydraulically-actuated electronically-controlled unit injector comprising: an electrically-energizable solenoid assembly including a movable armature; a poppet adapter defining a bore and a drain passage, said drain passage communicating with the poppet adapter bore; a poppet sleeve positioned in the poppet adapter bore, said poppet sleeve defining a bore, an annular seat and a laterally-extending passage communicating with the poppet sleeve bore; a body having a bore, an actuating fluid inlet passage communicating with the body bore, and an annular valve seat defined in the body bore; and an elongated poppet valve connected to the armature and having a first end portion, an intermediate portion and a second end portion, said first end portion positioned in the poppet sleeve bore according to a predetermined diametrical clearance, said second end portion positioned in the body bore according to a predetermined diametrical clearance which is less than the other predetermined diametrical clearance, said intermediate portion defining an upper seat, said second end portion defining a lower seat, said poppet valve being movable between first, second and third positions, said poppet valve lower seat being seated against the body annular valve seat to block fluid communication with the actuating fluid inlet passage and said poppet valve upper seat being unseated from the poppet sleeve annular seat to open fluid communication with the poppet adapter drain passage when the poppet valve is at its first position, said poppet valve lower seat being unseated from the body annular valve seat to open fluid communication with the actuating fluid inlet passage and said poppet valve upper seat being unseated from the poppet sleeve annular seat to open fluid communication with the poppet adapter drain passage when the poppet valve is at its second position, said poppet valve lower seat being unseated from the body annular valve seat to open fluid communication with the actuating fluid inlet passage and said poppet valve upper seat being seated against the poppet sleeve annular seat to block fluid communication with the poppet adapter drain passage when the poppet valve is at its third position; and means for biasing the poppet valve towards its first position, said armature moving the poppet valve towards its third position when the solenoid assembly is electrically energized.