Pneumatic tool motor having an internal hammering device

A pneumatic tool motor comprising:

• a cylinder including a chamber defined therein, a front cover and a rear cover respectively mounted onto a front end and a rear end of the cylinder, a front bearing and a rear bearing respectively disposed on the front cover and the rear cover;
• a rotor set rotatably received in the chamber, the rotor set including a roller cylinder and multiple blades radially partially inserted into the roller cylinder, wherein the roller cylinder has a front end rotatably coupled with the front bearing and a rear end rotatably coupled with the rear bearing and the blades abut against an inner periphery of the chamber;
• an inner chamber defined in the roller cylinder of the rotor set;
• an output shaft extending through the roller cylinder, the output shaft sequentially divided into a driven section, a middle section and a drive section, the driven section secured in the rear cover, the drive section extending through the front cover and the middle section corresponding to the inner chamber in the roller cylinder;
• an internal hammering device disposed in the inner chamber in the roller cylinder of the rotor set, the internal hammering device including at least one hammering block formed on the middle section of the output shaft, at least one active hammer peripherally corresponding to the at least one hammering block and at least one supporting rod longitudinally positioned in the roller cylinder for supporting the at least one active hammer, wherein the front end of the roller cylinder of the rotor set abuts against the front cover of the cylinder and the rear end of the roller cylinder of the rotor set abuts against the rear cover of the cylinder.