Abstract: A torque-adjustable pneumatic tool comprises a body, a trigger assembly, and a torque-adjusting module. The body has an outlet tunnel. The trigger assembly is mounted to the body. The torque-adjusting module is mounted to the body, communicates with the outlet tunnel, and has a silencer, an adjusting bolt, and a piston lid. The silencer has a recess and an exhaust portion communicating with the recess. The exhaust portion has a threaded hole and at least one exhaust hole that are separately disposed through the exhaust portion. The adjusting bolt is movably mounted to the threaded hole of the silencer from a side away from the body, and engages with the silencer through threads. The piston lid is fixed to the adjusting bolt and is able to enter the recess.

Abstract: A pneumatic generating device has a valve sleeve, a valve core, a piston pin, and a guiding assembly. The valve sleeve has a sleeve chamber and an input end. The valve core is mounted rotatably in the valve sleeve and has an axial hole and an annular groove. The annular groove is defined around the valve core. The piston pin is mounted moveably in the axial hole and has an end extending out of the input end of the valve sleeve and combined with a sealing cap. The guiding assembly is combined rotatably with the valve core and has a signal member and a guiding tube. The signal member is held in the annular groove in the valve core and has a passage communicating with the sleeve chamber. The guiding tube is connected with signal member and communicates with the passage in the signal member.

Abstract: A pneumatic tool has a body and a torque adjusting unit. The body has a trigger chamber, a trigger assembly, an inlet channel, and an outlet channel. The torque adjusting unit is connected with a bottom of the body, is mounted on one end of the outlet channel, and has a silencer, a piston rod, a piston sleeve, and a spring. The silencer is mounted detachably on the bottom of the body and having a discharging chamber. The piston rod is connected adjustably with the silencer and extends into the discharging chamber. The piston sleeve is mounted around the piston rod and is axially moveable relative to the piston rod. The spring is mounted around the piston sleeve and has two ends abutting respectively the piston sleeve and the silencer.

Abstract: A pneumatic generating device has a valve sleeve, a valve core, a piston pin, and a guiding assembly. The valve sleeve has a sleeve chamber and an input end. The valve core is mounted rotatably in the valve sleeve and has an axial hole and an annular groove. The annular groove is defined around the valve core. The piston pin is mounted moveably in the axial hole and has an end extending out of the input end of the valve sleeve and combined with a sealing cap. The guiding assembly is combined rotatably with the valve core and has a signal member and a guiding tube. The signal member is held in the annular groove in the valve core and has a passage communicating with the sleeve chamber. The guiding tube is connected with signal member and communicates with the passage in the signal member.

Abstract: A pneumatic tool has a body and a torque adjusting unit. The body has a trigger chamber, a trigger assembly, an inlet channel, and an outlet channel. The torque adjusting unit is connected with a bottom of the body, is mounted on one end of the outlet channel, and has a silencer, a piston rod, a piston sleeve, and a spring. The silencer is mounted detachably on the bottom of the body and having a discharging chamber. The piston rod is connected adjustably with the silencer and extends into the discharging chamber. The piston sleeve is mounted around the piston rod and is axially moveable relative to the piston rod. The spring is mounted around the piston sleeve and has two ends abutting respectively the piston sleeve and the silencer.

Abstract: A pneumatic motor has a housing, an axle, and multiple blades. The axle is rotatably mounted in the housing and has multiple blade recesses. The blades are mounted respectively and moveably in the blade recesses. Each blade has an inner side edge. The inner side edge is mounted in a corresponding one of the blade recesses. The inner side edge of each one of at least half of the multiple blades has a straight segment and a rectangular tab. Each one of the blade recesses which holds the blade having the straight segment and the rectangular tab has a bottom having a straight segment and a tab hole.

Abstract: A pneumatic motor has a housing, an axle, and multiple blades. The axle is rotatably mounted in the housing and has multiple blade recesses. The blades are mounted respectively and moveably in the blade recesses. Each blade has an inner side edge. The inner side edge is mounted in a corresponding one of the blade recesses. The inner side edge of each one of at least half of the multiple blades has a straight segment and a rectangular tab. Each one of the blade recesses which holds the blade having the straight segment and the rectangular tab has a bottom having a straight segment and a tab hole.

Abstract: A method of manufacturing a shaft of a pneumatic tool has steps of casting, friction welding and processing. In the step of casting, a hollow section of a first segment and a second segment are respectively prepared. In the step of friction welding, the second segment is connected with a second end surface of the hollow section of the first segment by a friction welding process to form a work-in-process shaft. In the step of processing, an outer surface of the work-in-process shaft is processed to form a shaft. The hollow section is casted to form through holes therein. Accordingly, the weight of the shaft is reduced, the shaft becomes light and the material cost of the shaft is diminished.