The invention discloses a double-
crank mechanism engine, belonging to the technical field of engines. The double-
crank mechanism engine comprises a
gas cylinder and a
piston capable of performing straight
reciprocating motion in the
gas cylinder, wherein two parallel crankshafts are arranged at the two sides of the
gas cylinder; a connecting rod is hinged between corresponding
crankshaft pins of the two crankshafts to form a double-
crank mechanism; a connecting rod
insertion slot and a slide block are arranged on a
piston rod on the rear end of the
piston, the connecting rod is inserted to the connecting rod
insertion slot in a sliding manner, a guide block is fixed in the engine; a guide rail for sliding the slide block is formed on the guide block; the slide block is inserted to the guide rail; transmission gears are arranged on the end parts of the crankshafts; an output gear is engaged between the two transmission gears; and an output shaft is arranged on the output gear. The double-crank mechanism engine can be used for effectively lowering the abrasion and the
impact of the piston and a cylinder sleeve, improving the reliability of the
ceramic material applied to the engine and improving the practical
heating efficiency.