Patent ID: 7566199

Claim:
A turbo pneumatic cylinder of a pneumatic tool, comprising: a cylinder housing formed with an internal cylinder chamber; a predetermined number of intakes being on a front end of the cylinder housing, whereby high-pressure gas can flow through the intake into the cylinder chamber; a predetermined number of exhaust ports being formed on a rear end of the cylinder housing to communicate with the cylinder chamber; at least one auxiliary intake and at least one auxiliary exhaust port being formed on a wall of the cylinder housing at a certain interval for communicating the cylinder chamber with outer side; a rotary shaft axially rotatably disposed in the cylinder housing; a front turbine, multiple blades being arranged on a circumferences of the front turbine at equal intervals; a rear turbine, multiple blades being arranged on a circumference of the rear turbine at equal intervals; the front and rear turbines being disposed in the cylinder chamber and fixed on the rotary shaft and synchronously rotatable therewith; the blades of the front and rear turbines being directed in the same direction; the auxiliary intake and auxiliary exhaust port being aligned with the front turbine; and a inverse turbine, multiple blades being arranged on a circumference of the inverse turbine at equal intervals, the inverse turbine being one-way rotatably fitted on the rotary shaft between the front and rear turbines, the rotational direction of the inverse turbine being reverse to the rotational direction of the front and rear turbines; the blades of the inverse turbine being directed in a direction reverse to the direction of the blades of the front and rear turbines; whereby after the high-pressure gas flows into the cylinder chamber to drive the front and rear turbines and the inverse turbine, the front and rear turbines and the rotary shaft rotate in the same direction, while the inverse turbine rotates in a direction reverse to the direction of the front and rear turbines.