Rotary piston engine

A rotary piston engine comprising:

• a casing composed of a rotor housing which has a trochoidal inner peripheral surface and side housings which close opposite ends of said rotor housing;
• a polygonal rotor disposed in said casing and adapted to rotate eccentrically therein;
• said polygonal rotor containing apex portions which slide over said trochoidal inner peripheral surface;
• said casing being provided with a first intake port which opens to said trochoidal inner peripheral surface and a second intake port which opens to the inner surface of said side housing at a position advanced from said frist intake port as seen in the rotational direction of the rotor;
• supply means and passage means for supplying a fuel-air mixture to said first intake port;
• means for supplying only air to said second intake port;
• a check valve provided in said passage means, said check valve being adapted to permit a flow through said passage means from said fuel-air mixture supply means toward said first intake port and to prevent a flow through said passage means in the opposite direction;
• a throttle valve provided in said fuel-air mixture supply means and a linkage mechanism operationally interconnecting said check valve with said throttle valve;
• and
• said linkage mechanism being adapted to forcibly open said check valve when said throttle valve is opened beyond a predetermined limit. 2. A rotary piston engine comprising:
• a casing composed of a rotor housing which has a trochoidal inner peripheral surface and side housings which close opposite ends of said rotor housing;
• a polygonal rotor disposed in said casing and adapted to rotate eccentrically therein;
• said polygonal rotor containing apex portions which slide over said trochoidal inner peripheral surface;
• said casing being provided with a first intake port which opens to said trochoidal inner peripheral surface and a second intake port which opens to the inner surface of said side housing at a position advanced from said first intake port as seen in the rotational direction of the rotor;
• supply means and passage means for supplying a fuel-air mixture to said first intake port;
• means for supplying only air to said second intake port;
• a check valve provided in said passage means, said check valve being adapted to permit a flow through said passage means from said fuel-air mixture supply means toward said first intake port and to prevent a flow through said passage means in the opposite direction;
• said passage means being provided with a valve seat;
• said check valve comprises a flap element rotatably supported by a pivot shaft for selectively traversing said passage means;
• said flap element being adapted to abut against said valve seat and close said passage means at a first end position of its rotation while fully opening said passage means when it is rotated to a second end position of its rotation;
• said flap element being biased toward said first end position of rotation by a coil spring;
• said flap element being connected with an arm which is co-rotatable with said flap element around said pivot shaft, the free end of said arm being engaged with a slot of first link element;
• said first link element being connected with a second link element;
• and
• said second link element being connected with a second arm which is in turn connected with a throttle valve provided in the fuel-air mixture supply passage means of a carburetor to be co-rotatable with said throttle valve around a second pivot shaft for said throttle valve;
• whereby when said throttle valve is opened beyond a predetermined opening, said flap element is forcibly rotated to said second end position of rotation by a linkage composed of said first mentioned arm, first and second link elements and said second arm.