Pneumatic Motors for Pneumatic Tools

Abstract

The invention relates to a pneumatic motor of a pneumatic tool. The pneumatic motor comprises an air cylinder, a rotary shaft and multiple blades. Multiple blade grooves are formed in the rotary shaft in the radial direction in a concave manner. Each blade is movably contained in the corresponding blade groove. The side edge, stretching into the corresponding blade groove, of each of at least half of blades is provided with a linear straight segment. A square convex piece is arranged in the middle of each straight segment in a convex manner. The shapes of at least half of the blade grooves correspond to those of the blades with the straight segments, and a linear straight segment corresponding to the straight segment of the corresponding blade is formed on the bottom edge of each of those blade grooves. A square concave portion capable of relatively containing the convex piece on the corresponding blade is arranged in the middle of the straight segment of each blade groove in a concave manner. Therefore, the pneumatic motor of the pneumatic tool is formed, wherein the number of air chambers can be increased, so that air consumption is reduced, and the operating efficiency is improved.

Description

technical field [0001] The present invention relates to an air tool, in particular to an air motor of an air tool. Background technique [0002] Existing pneumatic tools mainly guide high-pressure gas into an air motor, so as to use high-pressure gas to drive the air motor to rotate, so as to further drive a tool to rotate, please refer to Figure 9 to Figure 11 , and the existing air motor mainly includes a cylinder 50, a rotating shaft 60 and a plurality of vanes 70, the cylinder 50 includes an air inlet 51 and an air outlet 52, the air inlet 51 is connected to a high-pressure gas source, the The shaft 60 is rotatably accommodated in the cylinder 50, and the shaft 60 is eccentrically arranged relative to the cylinder 50. A plurality of vane grooves 62 are radially recessed around the periphery of the shaft 60, and each vane 70 is respectively movably accommodated in each vane slot. 62, when the compressed gas is introduced into the cylinder 50 through the air inlet 51 of t...

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Problems solved by technology

[0003] However, the side edge 72 of the existing blade 70 is curved, so the bottom 622 of each blade groove 62 of the rotating shaft 60 is also relatively curved, so the thickness of the rotating shaft 60 near the center of the shaft will become thinner due to the arrangement of the blade grooves 62 , and because during the movement of the air motor, the rotating shaft 60 will receive a considerable load force near the axial center, so the thinning of the axial center of the rotating shaft 60 will weaken the overall structural strength of the rotating shaft 60, making the rotating shaft 60 easy to damage, and then The overall service life of the air motor is reduced, so most of the existing air motors are only provided with six blades 70, and the inner area of ​​the cylinder 50 is divided into six air chambers to provide enough torque to drive the rotating shaft 60 and the tool part to move. And maintain the structural strength of rotating shaft 60, but like this, each air chamber in the cylinder 50 all has considerable volume, so the high-pressure gas that each air chamber of input is in order to push blade 60 needs is more, slightly in the use of high-pressure gas. Too wasteful, and the torque it provides will be limited

[0004] Also, if the number of air chambers is increased by increasing the number of blades 70, and the volume of each air chamber is reduced, to reduce the gas consumption of high-pressure gas and to increase the output torque of the air motor, but the increase in the number of blades 70 will further The thickness of the rotating shaft 60 near the center of the shaft becomes thinner, and the structural strength of the rotating shaft 60 is further weakened, so that it cannot withstand high loads and is easily damaged, which will reduce the overall service life of the air motor

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