Fuel injector

Claim 2

In a fuel injector having an outer case member, a fuel chamber formed therein, valve means controlling the escape of fuel therefrom into a combustion chamber, the improvement which comprises a fuel tube of unitary construction defining outer and inner diameters with one end of said tube adapted for connection with a source of fuel pressure and the other end of said tube forming an integral part of said injector, wherein said other end of said fuel tube is disposed within said case member, means affixing said tube adjacent its other end to said case member and providing an end portion disposed within said case member, said tube having longitudinal passageways disposed substantially over the entire length of said end portion, means in said end portion permitting the flow of fuel therethrough into said passageways and thence into said chamber, said tube end portion forming an accumulator chamber, and blocking means preventing direct communication between said tube and said accumulator chamber.

Claim 3

The fuel injector of claim 1 wherein the blocking means is a pin and wherein said flow permitting means are cross passages communicating said inner diameter with said outer diameter.

Claim 4

The fuel injector of claim 1 wherein the longitudinal passageways are longitudinal grooves.

Claim 5

The fuel injector of claim 1 wherein said flow permitting means are radially disposed openings communicating with said grooves.

Claim 6

In a fuel injector having an outer case member, a fuel chamber formed therein, valve means controlling the escape of fuel therefrom into a combustion chamber, the improvement which comprises a fuel tube of unitary construction defining outer and inner diameters with one end of said tube adapted for connection with a source of fuel pressure and the other end of said tube forming an integral part of said injector, wherein said other end of said fuel tube is enlarged so as to form said outer case member as an integral, one-piece unit with said one end of said fuel tube, said enlarged other end having an enlarged inner bore, the lower end of which defines said fuel chamber, and further including means defining an accumulator chamber in said case member, wherein said means defining an accumulator chamber comprises a closed-end tube fixedly mounted within said inner bore, the open end of said closed-end tube being cooperable with said valve means whereby leaked fuel which leaks past said valve means is trapped by said accumulator chamber.

Claim 7

In a fuel injector having an outer case member, a fuel chamber formed therein, valve means controlling the escape of fuel therefrom into a combustion chamber, the improvement which comprises a fuel tube of unitary construction defining outer and inner diameters with one end of said tube adapted for connection with a source of fuel pressure and the other end of said tube forming an integral part of said injector, wherein said other end of said fuel tube is enlarged so as to form said outer case member as an integral, one-piece unit with said one end of said fuel tube, said enlarged other end having an enlarged inner bore, the lower end of which defines said fuel chamber, and further including means defining an accumulator chamber in said case member, wherein said means defining an accumulator chamber comprises a closed-end tube fixedly mounted within said inner bore, the open end of said closed-end tube being cooperable with said valve means whereby leaked fuel which leaks past said valve means is trapped by said accumulator chamber.

Claim 8

The fuel injector of claim 5 wherein said closed-end tube has longitudinal passageways thereon permitting flow of fuel therethrough from said one end of said fuel tube to said fuel chamber.