STIRLING ENGINE

A heat engine includes four groups of cylinder assemblies and a transmission output mechanism. The transmission output mechanism includes a rocker-arm shaft support (100), a crankshaft support (200), a first rocker-arm assembly (4), a second rocker-arm assembly (5), and a crankshaft (300) rotatablely installed on the crankshaft support (200). A crankshaft long-arm connecting rod (301) and a crankshaft short-arm connecting rod (302) are hinged on the crankshaft (300). The first rocker-arm assembly (4) includes a first straight shaft (41), a first long arm (42) and a second long arm (43), and a first hinged part (431) is arranged on the second long arm (43) to hinge with the crankshaft long-arm connecting rod (301). The second rocket-arm assembly (5) includes a second straight shaft (41), a third long arm (52) and a fourth long arm (53) and a short arm (54). A second hinged part (53) is arranged on the short arm (54) to hinge with the crankshaft short-arm connecting rod (302). The crankshaft long-arm connecting rod (301) is parallel with the short arm (54) and the crankshaft short-arm connecting rod (302) is parallel with the second long arm (43). The heat engine is simple in structure, has low manufacturing cost and makes less noise.