Fuel injector assembly

• Main Author: MALPASS, SR.; ALEXANDER
• Format: Patent
• Language: English
• Published: 12.08.1975
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

A fuel injector assembly for injecting liquid fuel into an internal combustion engine cylinder comprises a main cylinder mounted upon the engine block and a main piston slidable within the main cylinder. The piston has an outer piston face which is exposed to the conditions prevailing in the engine cylinder and an inner piston face. A pump plunger is secured to the inner piston face and coacts with a pump chamber to pump liquid fuel into the engine cylinder during upward movement of the main piston into the main cylinder caused by the progressively increasing pressure developed in the engine cylinder during the compression stroke of the engine piston. Liquid fuel is also admitted into the interior of the main cylinder behind the main piston so that the increase in pressure developed in the engine cylinder acts through the main piston to accordingly pressurize the liquid fuel within the main cylinder. A pressure-responsive modulator valve modulates the exhausting of fuel from the main cylinder in dependence upon the fuel pressure within the main cylinder to thereby control the rate and extent of movement of the main piston to accordingly control the timing and amount of fuel injected into the engine cylinder.