Back to results
US 4,146,178 AGranted
Unit fuel injector
AssigneeCaterpillar Tractor Co.
InventorJohn M. Bailey
Life of this patent
Estimating the term…
Abstract
The unit fuel injector disclosed is directly mountable on cylinder heads in an internal combustion compression ignited engine. The device includes a housing with a spring-biased cam operated reciprocating piston mounted therein. The ported piston has a constant length stroke in the two embodiments disclosed. The quantity of fuel injected on each constant length stroke is determined by a movable ported sleeve member in which the piston reciprocates. Fuel is supplied to the unit fuel injector through appropriate porting in the cylinder head in a conventional manner.
Claims10
A unit fuel injector comprising:
- a mounting portion defining a bore therethrough and adapted for communication of fuel thereto;
- an elongated housing fixedly disposed in said mounting portion bore, said housing defining an axial bore therethrough and first passage means for communicating fuel from said mounting portion to said axial bore;
- pressure actuated nozzle means sealingly affixed at one end of said axial bore;
- plunger means resiliently biased to a first position in said axial bore to form a first cavity with said nozzle means and said axial bore, said plunger means allowing said first passage means to communicate with said first cavity, said plunger means movable in a first direction for blocking said first passage means and increasing pressure of fluid in said cavity sufficiently to actuate the pressure actuated nozzle means whereby fluid is communicated outwardly of said cavity through said nozzle means, and further said plunger means defining second passage means communicating with said first cavity for selectively venting said first cavity;
- sleeve means slidably disposed about said plunger means and axially positionable relative said housing along said plunger means for selectively opening said second passage means to vent said increased pressure in said first cavity through said second passage means at a predetermined position of said plunger means relative to said sleeve means.
2 more elements
Dependencies are inferred from the claim text.