| 摘要 |
A fuel injection pump comprising a housing including a wall having therein a bore, a low pressure fuel chamber communicating with a source of low pressure fuel, and a high pressure fuel chamber having a pressure controlled fuel outlet, an armature structure movably mounted in the housing for movement in a first direction pressurizing the fuel in the high pressure chamber and in an opposite direction, and including a fuel passage communicating between the low pressure fuel chamber and the high pressure fuel chamber and including therein a valve seat, an electrical coil mounted on the housing and operable, when energized, to cause armature structure movement in the first direction, a spring located in the housing and operable, when the coil is deenergized, to cause armature structure movement in the opposite direction, a poppet valve slidable within the fuel passage in the armature structure and relative thereto in response to movement of the armature structure relative to the housing and through a stroke length between a first position permitting flow in the fuel passage from the low pressure fuel chamber to the high pressure fuel chamber, and a second position preventing fuel flow between the high and low pressure fuel chambers, and comprising a head portion located in the high pressure fuel chamber and including a valve surface which is spaced from the valve seat when the poppet valve is in the first position permitting fuel flow from the low pressure fuel chamber to the high pressure fuel chamber, and which is sealingly engaged with the valve seat when the poppet valve is in the second position preventing fuel flow between the high and low pressure fuel chambers, an adjustment member extending in the bore in the housing wall and being engageable with the poppet valve to control the stroke length thereof between the fuel flow permitting and fuel flow preventing positions, and means for displacing the adjustment member relative to the housing end wall to variably determine the stroke length of the poppet valve.
|
