Electronic unit injector
An electronic unit injector is described, comprising: injector body means for forming a fuel inlet, an injector chamber and an inlet passage connecting the fuel inlet and the injector chamber; nozzle means for defining a nozzle chamber in fluid communication with the injector chamber, discharge orifice means and a valve seat; needle valve means including a needle valve mounted in the nozzle means and axially displaceable in response to pressure above a first pre-established threshold in the nozzle chamber from a closed position wherein the needle valve engages the valve seat to prevent the discharge of fuel through the orifice means to an opened position wherein fuel in the nozzle chamber is discharged through the orifice means; plunger means including a plunger displaceable in the injector chamber for pressurizing fuel therein; expandable chamber means comprising means defining an expandable subtraction chamber in fluid communication with the injector chamber during the pressurization of fuel by the plunger means and means for expanding the volume of the subtraction chamber as the pressure in the subtraction chamber and increases between second and third threshold pressures; and solenoid valve means mounted to the body means and actuable between first and second positions for selective controlling fluid communication through the inlet passage.
- Assignee:
- Stanadyne, Inc., Windsor, CT
- Patent Number(s):
- US 4811715
- OSTI ID:
- 6101710
- Country of Publication:
- United States
- Language:
- English
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