Heat engine

A heat engine comprising four cylinder-assemblies and a transmission output mechanism for transmitting and outputting power, the transmission output mechanism comprising a rocker-arm shaft support, a crankshaft support, a first rocker-arm assembly, a second rocker-arm assembly, and a crankshaft rotatablely mounted to the crankshaft support, further comprising a crankshaft long-arm connecting rod and a crankshaft short-arm connecting rod pivotally connected to the crankshaft;

• the first rocker-arm assembly comprises a first straight shaft with a length approximately equal to a distance between centers of two adjacent cylinders, a first long arm and a second long arm respectively with a length equal to or longer than half length of the first straight shaft, wherein the first long arm and the second long arm are perpendicular to the first straight shaft and positioned at two sides of the first straight shaft, one end of the first long arm and one end of the second long arm are fixedly connected to two ends of the first straight shaft respectively and the other ends thereof are pivotally connected to two rods of two cylinder assemblies at one diagonal respectively, an angle between the first long arm and the second arm is in a range of 120 to 240 degrees, and the second long arm is provided with a first hinged part for pivotally connecting the crankshaft long-arm connecting rod;
• the second rocker-arm assembly comprises a second straight shaft with a length approximately equal to a distance between centers of two adjacent cylinders, a third long arm and a fourth long arm respectively with a length equal to or longer than half length of the second straight shaft, and a short arm with a length equal to or shorter than half length of the second straight shaft, wherein the third long arm and the fourth long arm are perpendicular to the second straight shaft and positioned at two sides of the second straight shaft, one end of the third long arm and one end of the fourth long arm are fixedly connected to two ends of the second straight shaft and the other ends thereof are pivotally connected to two rods of two cylinder assemblies at the other diagonal respectively, an angle between the third long arm and the fourth arm is in a range of 120 to 240 degrees, one end of the short arm is in fixed connection with connection part of the third long arm and the second straight shaft, the other end of the short arm is provided with a second hinged part for pivotally connecting the crankshaft short-arm connecting rod;
• a distance between the first hinged part of the first rocker-arm assembly and the first straight shaft is equal to that between the second hinged part of the second rocker-arm assembly and the second straight shaft;
• the first straight shaft of the first rocker-arm assembly and the second straight shaft of the second rocker-arm assembly are parallel to each other and are rotatablely mounted to the rocker-arm shaft support, the crankshaft long-arm connecting rod is parallel to the short arm, and the crankshaft short-arm connecting rod is parallel to the second long arm.