초록 ▼

Improvements in fuel injection nozzles for spark ignited internal combustion engines enabling a metered quantity of fuel entrained in a gas to be delivered into a combustion chamber to optimize the efficiency of operation of the engine. The fuel injection nozzle has a port (11) and a valve (15) mova

Improvements in fuel injection nozzles for spark ignited internal combustion engines enabling a metered quantity of fuel entrained in a gas to be delivered into a combustion chamber to optimize the efficiency of operation of the engine. The fuel injection nozzle has a port (11) and a valve (15) movable relative to the port (11). Port (11) and the valve (15) have respective annular sealing faces (13) and (18) defining an annular frustoconical shaped throat (25) when the nozzle is open for the flow of metered fuel therethrough. The nozzle has a shroud (20) extending from the port (11) surrounding the periphery of the valve (15) when the nozzle is open and defining a delivery passage 27 downstream of the throat in the direction of fuel flow towards the combustion chamber. The delivery passage 27 is configured to be purged of fuel after each fuel delivery cycle to prevent carbon build-up in the nozzle.

대표청구항 ▼

A spark ignited internal combustion engine fuel injection system wherein a metered quantity of fuel entrained in a gas is delivered directly to a combustion chamber of the engine through a selectively openable nozzle, said nozzle comprising a nozzle body having an internal cavity wherein the metered

A spark ignited internal combustion engine fuel injection system wherein a metered quantity of fuel entrained in a gas is delivered directly to a combustion chamber of the engine through a selectively openable nozzle, said nozzle comprising a nozzle body having an internal cavity wherein the metered quantity of fuel is entrained in the gas, a port in the nozzle body communicating the cavity with an external face of said body which in use is located within the engine combustion chamber, an internal annular seal face located in said port between the cavity and said external face of said body, a valve member having an external annular seal face adapted to normally sealably engage said internal seal face to close said port, means operable to selectively move said valve member relative to the port to a port open position, an annular internal terminal surface in the port extending from said internal seal face to said external face of the body, an annular external terminal surface on the valve member extending from said external seal face and defining with said internal terminal surface in the port when the valve member is in the open position an annular passage having in radial section an included angle between the internal and external terminal surfaces of 0°to 40°and with the internal terminal surface in the radial section inclined to the passage axis at an angle not greater than about 15°, the passage being of maximum width at the external surface of the body.