Fuel injector with hoop nozzle spray tip
A fuel injection nozzle is described with hoop nozzle spray tip including a valve body means having a stepped bore therethrough to define at one end of the valve body means an outlet passage with a valve seat encircling the inboard end of the outlet passage; a passage means in the valve body means in flow communication at one end with the stepped bore inboard of the valve seat and being connectable at its opposite end to a source or pressurized fuel; an injector valve means movable in the valve body means relative to the valve seat to control flow to the outlet passage; a hollow, closed end, inner plug valve element operatively fixed to the valve body means so as to serve as an extension of the outlet passage; the inner plug valve element having an outer peripheral valve seat surface with an annular groove therein and having spaced apart port passages for effecting flow communication between the outlet passage and the annular groove; and, a cylindrical outer hoop valve element with a straight thin annular hoop-skirt valve of predetermined radial thickness operatively fixed to the valve body means with the hoop-skirt valve in shrink-fit encirclement of the inner plug valve element so as to overlie the annular groove whereby the hoop-skirt valve is prestressed and is operative as an integral hoop valve which is adapted to expand radially relative to the inner plug valve element, when the passage means and the outlet passage are supplied with fuel at a predetermined high pressure as controlled by the injector valve means, to form therewith a fuel discharge annulus.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4576338
- OSTI ID:
- 5757119
- Country of Publication:
- United States
- Language:
- English
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