Abstract: The application relates to a driving mechanism which is comprised of a toggle rod and a ratchet wheel (61), the toggle rod is comprised of a linkage (4) and a big arm (24) of a sliding bush (14), and the driving mechanism converts reciprocating motion to rotary motion. Four parallel cylinders (2) are disposed in a cylinder block (1), a main shaft (25) is placed between the cylinders (2), and the axis of the main shaft is perpendicular to the axis of cylinders. There are two big arms (24) and two small arms (34) on the sliding bush (14). The linkage (4) is connected to the big arm (24) by a pin. Pistons (3) are reciprocated, and the big arms (24) are swayed by the linkage (4). The small arm (34) has forward and reverse detents (29). The mechanism is used in engines and other transmission mechanisms.