초록

A separate valve, rotatable with a pump control valve in a multiple plunger type fuel injection pump used to sequentially supply fuel to a number of fuel injection nozzles, is actuated by a solenoid to control fuel spill from each plunger whereby to control quantity and timing of injection.

대표청구항 ▼

A fuel injection pump comprising, in combination, a housing means having a central stepped bore defining a valve sleeve closely adjacent to one end of said housing means, a solenoid assembly fixed to and closing said one end of said housing means; a control valve rotatably journaled in said valve sl

A fuel injection pump comprising, in combination, a housing means having a central stepped bore defining a valve sleeve closely adjacent to one end of said housing means, a solenoid assembly fixed to and closing said one end of said housing means; a control valve rotatably journaled in said valve sleeve and positioned to define an annular fuel chamber with one end of said solenoid assembly; said housing means having a passage in communication at one end with said fuel chamber and connectable at its other end to a source of fuel, a plurality of pumping means equally circumferentially spaced around said bore; each of said pumping means having a pump chamber connected to a fuel passage in communication with said bore and to a valve controlled fuel discharge outlet means; and, a drive means journaled in the opposite end of said housing and operatively connected to said pumping means to effect sequential operation thereof and to said control valve for rotating said control valve; said control valve having a fuel control means thereon to form with said valve sleeve a supply chamber in communication with said fuel chamber and adapted to be placed in communication sequentially with each of said fuel passages, said control valve further having a spill passage means therein with one end thereof radially aligned for sequential communication with each of said fuel passages during rotation of said control valve and the opposite end thereof being positioned coaxial with said bore and operatively opening into said fuel chamber, said solenoid assembly having an armature and a separate valve actuated by said armature and positioned so as to control flow from said pump chambers via said spill passage means into said fuel chamber; said valve being journaled whereby it can rotate with said control valve, said valve being operative as controlled by said armature whereby both the amount of fuel discharged into each of such fuel discharge outlet means and the timing thereof is controlled by operation of said armature of said solenoid assembly to control spill flow out through said spill passage means.