Claims
- 1. A closed nozzle fuel injector adapted to inject fuel at high pressure into the combustion chamber of an engine, comprising:
- an injector body containing an injector cavity including a nozzle cavity and an injector orifice communicating with one end of said nozzle cavity to discharge fuel into the combustion chamber, said injector body including a fuel transfer circuit for transferring supply fuel to said injector orifice, said fuel transfer circuit including a delivery passage for delivering an unrestricted flow of fuel to said nozzle cavity;
- a nozzle valve element positioned in said nozzle cavity adjacent said injector orifice, said nozzle valve element operable to be placed in an open position in which fuel may flow from said fuel transfer circuit through said injector orifice into the combustion chamber and a closed position in which fuel flow through said injector orifice is blocked;
- a rate shaping control means for varying the flow rate of fuel through said injector orifice, said rate shaping control means including a throttling passage integrally formed in said nozzle valve element for restricting the flow of fuel to said nozzle cavity to thereby vary the rate at which fuel pressure in said nozzle cavity increases.
- 2. The closed nozzle injector of claim 1, wherein said fuel transfer circuit includes an unrestricted delivery passage means for permitting unrestricted fuel flow to said nozzle cavity, said rate shaping control means including a flow control valve means for controlling the flow of fuel through said unrestricted delivery passage, said flow control valve means including a valve land integrally formed on said nozzle valve element, said valve land movable into a blocking position preventing flow of fuel through said unrestricted delivery passage when said nozzle valve element is positioned in said closed position.
- 3. The closed nozzle injector of claim 2, wherein said unrestricted delivery passage means includes a plurality of grooves formed in said nozzle valve element.
Parent Case Info
This is a Divisional application of Ser. No. 08/376,417, filed Jan. 23, 1995 now U.S. Pat. No. 5,647,536.
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Divisions (1)
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Number |
Date |
Country |
Parent |
376417 |
Jan 1995 |
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