Fuel injection type rotary piston engine

Claim 1

Fuel injection type rotary piston engine including a rotor casing which comprises a rotor housing having a trochoidal inner wall and a pair of side housings secured to the opposite sides of the rotor housing to define a rotor chamber therein, a substantially polygonal rotor disposed in said rotor chamber for revolution and rotation therein with apices thereof in sliding contact with said trochoidal inner wall of the rotor housing so as to define working chambers between the casing and the rotor, exhaust means communicating with one oF said working chamber at a time for removing fluid therefrom, first air intake port means formed in at least one of said side housings so as to open into the rotor chamber, first air intake passage means communicating with said first air intake port means and having first throttle valve means disposed therein, second air intake port means formed in said rotor housing so as to open into the rotor chamber, second air intake passage means communicating with said second air intake port means and having second throttle valve means disposed therein, means for closing said first throttle valve means in said first air intake passage means during light load operation of the engine while the second throttle valve of said second air intake passage means is still open, and fuel injection means for injecting fuel into one of the working chambers into which fresh air is introduced so that the injected fuel intersects the air flow from the second air port means, said second air intake port means having substantially smaller distance in the peripheral direction of the rotor housing than in the widthwise direction, the ratio of the effective passage area of the second air intake port means to that of the first air intake port means being between 1 to 3 and 1 to 9, whereby the air flow stream from the second air port means has a greater width than the injected fuel flow at the point of intersection.