Fuel flow control valve assembly
AssigneeFord Motor Company
InventorAladar O. Simko
Life of this patent
Estimating the term…
Abstract
A plurality of fuel valve injectors for a diesel engine combustion chamber in which a fuel flow control valve assembly having a high pressure fuel inlet is intermittently pressurized, and a low pressure supply pump inlet connected to a fuel pressurization chamber and to a prechamber fuel injector, the high pressure fuel moving a plunger to unseat a ball valve and pressurize the fuel to the injector to inject fuel through it, the stroke of the plunger being determined by the spacer, seating of the ball valve against a seat terminating flow to the injector, continued pressurization in inlet then opening the pressure relief mechanism of the main chamber injector.
Claims11
A fuel flow control valve assembly for selectively supplying fuel at two different pressure levels to a pair of fuel injectors mounted in a combustion chamber means and each operable at one of the pressure levels, comprising a valve body having first and second fuel inlets, and first and second fuel outlets connected respectively to first and second fuel injectors, the first inlet containing fuel varying in pressure from essentially zero to a high level, the second inlet containing fuel at an essentially constant low level, first and second conduit means connecting the first and second inlets respectively to the first and second outlets, the outlets each containing a normally closed pressure relief valve permitting a pressure buildup in the first and second conduit means upon an increase in pressure of the fuel in the inlets to predetermined levels, the first outlet pressure relief valve being operable to open at a higher pressure level than the second outlet pressure relief valve, a fuel pressurizing chamber connected to the second inlet and to the second outlet, the second inlet having a spring seated ball check valve means therein normally blocking the second inlet and acted upon by the fuel in the second inlet and movable at times to an open position to admit makeup fuel to the chamber, a shuttle valve means reciprocatingly mounted for progressive movement into the chamber to decrease the volume of the chamber to progressively pressurize the fuel therein and to increase the volume of the chamber to depressurize the chamber upon movement of the valve means in the opposite direction, and means subjecting the valve means to the fuel pressure in the first conduit means for moving the valve means to open the second outlet pressure relief valve to flow fuel therepast prior to the opening of the first outlet pressure relief valve.
A fuel flow control valve assembly for selectively supplying fuel at two different pressure levels to a pair of fuel injections mounted in a combustion chamber means and each operable at one of the pressure levels, comprising a valve body having an axial through bore having fuel outlets at opposite ends, a first fuel inlet at one end connected in parallel flow relationship to the one end outlet and to the bore, the first inlet containing fuel intermittently varying in pressure from essentially zero to a high pressure level, a second fuel inlet connected to another portion of the bore, the second inlet containing fuel under a relatively low essentially constant pressure and having a spring closed one-way check valve to permit makeup flow into the bore at times while preventing return flow, a plunger type valve having a plunger slidably and sealingly mounted in the bore subject to the pressure of the fuel in the first inlet while preventing communication of the fuel from the first inlet past the plunger, means together with the plunger defining a fuel chamber in the bore connected to the second fuel inlet whereby the fuel in the chamber is pressurized and discharged through the second outlet upon movement of the plunger into the chamber by the first inlet fuel pressure thereagainst and is depressurized upon retraction movement of the plunger upon decrease in the first inlet fuel pressure to unseat the check valve means and admit makeup fuel to the chamber, spring means biasing the plunger in a retraction movement direction, the first and second outlets each containing a pressure relief valve, the first outlet relief valve being operable to open at a higher pressure level than the second outlet relief valve, and stop means in the bore in the path of movement of the plunger to limit the movement of the plunger to pressurization of the chamber and closure of the second outlet relief valve to terminate discharge of fuel through the second outlet while defining the maximum stroke of the plunger and permitting continued rise in pressure in the first inlet to a level sufficient to open the first relief valve, decay of the pressure in the first fuel inlet line effecting the closure of the first and second relief valves and permitting the spring means to reset the plunger by retracting the plunger from the chamber to lower the pressure therein to a level effecting opening of the check valve and refilling of the chamber with fuel to the pressure level of the fuel in the second inlet.
Dependencies are inferred from the claim text.