Patent ID: 7866251

Claim:
A power machine, comprising: a cylinder body having at least one cylinder, the at least one cylinder having at least one admission passage and at least one exhaust passage arranged on a head portion thereof, an electronic valve arranged in the at least one admission passage serving as an admission valve, and an exhaust valve arranged in the at least exhaust passage; at least one piston moveably arranged in the at least one cylinder; a crank chamber mounted on the at least one cylinder; a crank member arranged in the crank chamber and connected with the piston; and an outer supply device communicated with the admission passage of the cylinder to provide high pressure gas; wherein the electronic valve is a solenoid valve driven by an admission valve driving member, the admission valve driving member comprises a limit switch and a cam for driving the limit switch, the limit switch is electrically connected with the solenoid valve, and the cam is connected with an output terminal of the crank member to drive the cam by driving the output terminal of the crank member for driving the limit switch and controlling the solenoid valve; wherein the exhaust valve is a poppet valve controlled by an exhaust valve driving member, the exhaust valve driving member comprises a cam follower and a transmission group, the cam follower is connected with an output terminal of the crank member through the transmission group to drive the cam follower by driving the output terminal of the crank member for controlling the poppet valve, and wherein the exhaust valve driving member further comprises an extending arm, the cam follower touches the poppet valve through the extending arm, the extending arm is arranged rotatably and coaxially on a pivot seat, and the pivot seat is fixed on the head portion of the cylinder; wherein the high pressure gas is admitted into and exhausted out of the cylinder by controlling the electronic valve and the exhaust valve to push the piston upwards or downwards and rotate the crank member for producing power; and wherein when the piston reaches an upper dead center, the electronic valve is opened and the exhaust valve is closed; when the piston reaches approximate 10 degrees before a lower dead center, the electronic valve is closed to stop providing the high pressure gas; when the piston reaches the lower dead center, the exhaust valve is opened to exhaust the high pressure gas; when the piston reaches approximate 5 to 10 degrees before the upper dead center, the exhaust valve is closed; when the piston returns to the upper dead center, the above steps repeats to maintain the piston moving circularly and maintain the crank member rotating for producing the power.