초록 ▼

A simple propulsion engine utilizing unheated atmospheric air as the propellant, and driven by a single cycle (unicycle) engine with internal combustion cylinder and free piston is disclosed. A free piston with an annularly arranged thrust piston to divide a dual-diameter cylinder into two combustio

A simple propulsion engine utilizing unheated atmospheric air as the propellant, and driven by a single cycle (unicycle) engine with internal combustion cylinder and free piston is disclosed. A free piston with an annularly arranged thrust piston to divide a dual-diameter cylinder into two combustion chambers and two thrust chambers is provided. Scavenge feeder lines connected the thrust chambers to the combustion chambers via check valves provide exhaust scavenging, additional thrust output through exhaust nozzles, and feeding of fresh air into the combustion chambers. Also, pressure-actuated fuel injectors utilize pressure changes in respective combustion chambers to inject fuel at the appropriate time. The fuel injector includes an intensifier piston and pintle to raise the fuel pressure.

대표청구항 ▼

1. A fuel injector comprising:an injector body having a control gas passage, the control gas passage receiving a control gas pressure; a fuel quantity plug/stop inserted into a first end of said injector body; an intensifier piston having a fuel injector nozzle, said intensifier piston slidably disp

1. A fuel injector comprising:an injector body having a control gas passage, the control gas passage receiving a control gas pressure; a fuel quantity plug/stop inserted into a first end of said injector body; an intensifier piston having a fuel injector nozzle, said intensifier piston slidably disposed within said injector body between a first position in which a fuel cavity is formed between said intensifier piston and said fuel quantity plug/stop and a second position in which a volume of the fuel cavity is reduced; said fuel quantity plug/stop including a fuel inlet passage in fluid communication with the fuel cavity; said intensifier piston further including a control gas pintle cavity axially formed therein and a pintle cavity control gas passage in fluid communication with said control gas passage; a intensifier piston stop provided at a second end of said injector body and preventing said intensifier piston from coming out of said injector body; an intensifier piston control gas passage providing fluid communication between said control gas passage and said intensifier piston; a pintle slidably disposed within said intensifier piston; a pintle closing spring provided in said control gas pintle cavity and biasing said pintle against said fuel injector nozzle; and a fuel delivery passage provided in said intensifier piston and interconnecting the fuel cavity and said pintle.