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US 4,877,187 AGranted
Unit injector for gasoline engines
AssigneeAllied-Signal Inc.
InventorPaul D. Daly
Life of this patent
Estimating the term…
Abstract
A gasoline unit injector comprising an outer, electrically conductive bellows, defining a variable volume fluid chamber, for reciprocating a piston within a pressure chamber to increase the fuel pressure in various downstream cavities. Various bellows are disposed within such chambers and are deformable in response to the increased pressure, the bellows are operative to control the rate at which fuel flows out from a metering orifice upon activation of a coil assembly.
Claims14
A unit injector adapted to receive fuel from a relatively low pressure source, comprising:
- a housing;
- armature means responsive to an electromagnetic force for opening and closing a metering orifice to control the ejection of fuel therefrom;
- a fuel receiving chamber disposed upstream of the metering orifice;
- a check valve disposed upstream of the fuel receiving chamber, responsive to a pressure differential thereacross to control the flow of fuel to such chamber;
- first accumulator means disposed in the fuel receiving chamber, compressible in response to the pressure of the fuel therein for pressurizing fuel upstream of the metering orifice;
- an outer bellows, fluidly sealed at one end, and adapted to expand and contract as fuel is received and purged therefrom, including a flexible, springlike wall effecting to restore the outer bellows to its non-expanded size;
- means defining a pressure chamber;
- means movable with the outer bellows to pressurize the fuel in the pressure chamber and for urging same across the check valve, compressing the first accumulator means;
- and
- means for generating the electromagnetic force to move the armature means away from the metering orifice.
7 more elements
Dependencies are inferred from the claim text.