Feeder wire structure for high pressure fuel injection unit

Abstract

An accumulator type of fuel injection nozzle having an injection valve that is controlled by an electromagnet within the accumulator chamber includes a feeder wire structure formed axially in the outer housing assembly of the injection nozzle for energizing the electromagnet. This feeder wire structure includes one or more axially extending wire passages formed in the outer housing assembly, preferably in a structure through which is formed a fuel inlet conduit, constructed so as to withstand the high pressure within the accumulator chamber, to provide a sufficient seal without increasing the outer diameter of the injection nozzle, and to provide easy installation of the injection nozzle without interference from the engine. One or more feeder wires are contained within the wire passages for energizing the electromagnet.

We claim: 
     
       1. An accumulator type of injection nozzle comprising an outer housing assembly defining a cavity partitioned into an accumulator chamber adapted to be supplied with high pressure fuel and a coil chamber, a nozzle port leading from said accumulator chamber, an injection valve moveable between a closed position and an open position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, a control chamber for receiving pressurized fuel, an actuating member supported for movement within said control chamber and associated with said injection valve for retaining said injection valve in its closed position when said control chamber is pressurized and for movement of said injection valve to its open position when pressure is relieved in said control chamber, valve means moveable between a closed position for maintaining pressure in said control chamber and an open position for relieving pressure in said control chamber for effecting fuel discharge through said nozzle port, a first electromagnet within said accumulator chamber for controlling the lift of said injection valve, and at least one wire passage formed in said outer housing assembly and extending axially, .[.and.]. at least one feeder wire extending axially through said wire passage for energizing said first electromagnet.Iadd., and seal means associated with said wire passage for sealing said wire passage so that it is able to withstand the pressure within said accumulator chamber.Iaddend.. 
     
     
       2. An accumulator type of injection nozzle as recited in claim 1, further comprising a second electromagnet within said coil chamber for moving said valve means to one of said positions when said second electromagnet is energized. 
     
     
       3. An accumulator type of injection nozzle as recited in claim 1, wherein an inlet conduit is formed in said outer housing assembly and extending axially for supplying fuel to said accumulator chamber. 
     
     
       4. An accumulator type of injection nozzle as recited in claim 3, wherein said wire passage and said inlet conduit are formed in the periphery of said outer housing assembly. 
     
     
       5. An accumulator type of injection nozzle as recited in claim 1, wherein said outer housing assembly comprises a cover member seated in said cavity, wherein said wire passage and an inlet conduit for supplying fuel to said accumulator chamber are formed in said cover member and extending axially. 
     
     
       6. An accumulator type of injection nozzle as recited in claim 5, wherein said wire passage and said inlet conduit are formed in the periphery of said cover member. .[.7. An accumulator type of injection nozzle as recited in claim 1, further comprising seal means associated with said wire passage for sealing said wire passage so that it is able to withstand 
     
     
        the pressure within said accumulator chamber..]. 8. An accumulator type of injection nozzle as recited in claim 1, wherein said wire passage is 
     
     
        formed in the periphery of said outer housing assembly. 9. An accumulator type of injection nozzle as recited in claim 1, further comprising a casing body and a cover member each having a plurality of holes formed in the periphery thereof, a partitioning plate for partitioning said cavity into said accumulator chamber and said coil chamber, said partitioning plate having a plurality of grooves formed in the periphery thereof, said accumulator type of injection nozzle further comprising a plurality of pins each of which is fitted into a corresponding casing body and cover member hole and a corresponding partitioning plate groove for preventing said casing body, said cover member and said partitioning plate from rotating relative to each other.