Fuel injection means for internal combustion engines

An internal combustion engine comprising a power cylinder, a power piston reciprocable in said cylinder, an air injection cylinder, an air injection piston reciprocable in the latter cylinder, an air duct interconnecting the two said cylinders, a crank shaft having crank means connected to both said pistons constraining said air injection piston to pursue an air compression stroke and an air intake stroke approximately simultaneously with and respectively with reference to a combustion stroke and a compression stroke of said power piston;

• and fuel injection means and firing means coacting with said power cylinder and timed to operate sequentially approximately at the end of said power piston's compression stroke;
• said air duct being so interconnected between the two said cylinders as to transfer air from said air injection cylinder into said power cylinder approximately at the end of said power piston's combustion stroke, said fuel injection means comprising a housing disposed upon the outer end of said power cylinder and formed with a bore therein opening into the latter cylinder, plunger means accurately fitted slidably in said bore, a solenoid having a solenoid rod coacting with said plunger means to hold the latter in an upper, non-fuel-injecting position, a duct interconnecting the upper end of said bore and a combustion chamber at the outer end of said power cylinder, spring means coacting with said plunger means to bias the latter toward its said upper position, a fuel controlling check valve, located in said bore at a distance below said plunger means to define therebetween a pump chamber, duct means opening into said pump chamber to transport fuel into the latter chamber, a manually operable slide element coacting with said plunger means to adjustably limit the sliding of said plunger means, a rotary switch coacting with said crankshaft and having a contact electrically connected to said solenoid, and a rotary switching element turning in one-to-one relationship to the turning of said crankshaft, said contact being so positioned in said rotary switch as to cause energizing of said solenoid to withdraw the latter's said rod from its coaction with said plunger means concurrently with the approach of said power piston to its outermost position in the power cylinder, thereby permitting said plunger means to force a measured charge of fuel from said pump chamber, past said fuel controlling check valve and into said combustion chamber.