Patent ID: 8499553

Claim:
A piston type pneumatic engine, comprising: a) a cylinder block; b) a piston ( 1 ); c) a cylinder ( 2 ); d) a crankshaft; e) a connecting rod ( 3 ); f) a camshaft ( 4 ); and g) a device for controlling the opening or closing of a gas valve; wherein a cylinder cover ( 5 ) is arranged on the cylinder block; an inwardly-opened type compressed-gas intake valve ( 7 ) and an exhaust valve ( 6 ) are arranged on the cylinder cover ( 5 ); an intake cam ( 8 ) and an exhaust cam ( 9 ) are arranged on the camshaft ( 4 ); the opening or closing of the intake and the exhaust valves ( 7 , 6 ) is controlled by a rocker arm ( 17 ) which is driven by the camshaft ( 4 ); the camshaft is driven by the rotated crankshaft via a timing chain ( 22 ) or belt, and then high-pressure gas is controlled to enter the cylinder ( 2 ) to promote the reciprocating motion of the piston ( 1 ) and to exhaust low-pressure gas after working is completed; the crankshaft is driven and rotated by the piston ( 1 ) via the connecting rod ( 3 ) to output power; a suction valve ( 11 ) is also arranged on the cylinder cover ( 5 ); a suction cam ( 12 ) is also arranged on the camshaft ( 4 ); the opening or closing of the suction valve ( 11 ) is controlled by the rocker arm ( 17 ) so as to further control the timing for the cylinder ( 2 ) to suck air outside and be closed; the bore-stroke ratio of the cylinder ( 2 ) and the piston ( 1 ) is 1:2-15; a groove ( 13 ) is provided on the cylinder cover ( 5 ) corresponding to a cylinder port; an intake port, an exhaust port, and a suction port are provided on the inner wall of the groove ( 13 ); an intake channel, an exhaust channel, and a suction channel ( 14 , 15 , and 16 ) are provided at each corresponding port, respectively; the intake channel ( 14 ) is externally connected with a compressed-gas source; the suction and the exhaust channels ( 16 , 15 ) are externally connected with atmosphere; an intake valve, an exhaust valve, and a suction valve ( 7 , 6 , and 11 ) are correspondingly provided at the intake, the exhaust, and the suction ports on the inner wall of the groove ( 13 ); the suction and the exhaust valves ( 11 , 6 ) are opened toward the inner part of the groove ( 13 ); and the intake valve ( 7 ) is opened toward the inner part of the intake channel ( 14 ).