TW201728825A - Pneumatic motor of pneumatic tool capable of increasing number of air chambers to reduce air consumption and enhance operation performance - Google Patents

Abstract

The present invention relates to a pneumatic motor of a pneumatic tool, which comprises a cylinder, a shaft and several blades. The shaft is recessed with several blade grooves along the radial direction. Each blade may be moveably received in the blade groove. Side edges of at least a half number of blades are extended into the blade grooves having a straight segment as a line and a rectangular flange is protruded in the middle of the straight segment; the shapes of at least a half number of blade grooves opposite to the blades having straight segments are formed with a linear straight segment corresponding to the straight segment of the blade at the bottom of the blade groove. The middle section of the straight segment of each blade groove is recessed with a rectangular concave portion for correspondingly receiving the flange on the blade. Thus, the present invention may constitute a pneumatic motor capable of increasing number of air chambers to reduce the air consumption and enhance operation performance.

Description

Air motor for pneumatic tools

The present invention relates to a pneumatic tool, and more particularly to a pneumatic motor for a pneumatic tool.

The existing pneumatic tools mainly guide high-pressure gas into a pneumatic motor to drive the air motor to rotate by using high-pressure gas to further drive a tool to rotate. Please refer to FIG. 9 to FIG. 11 , and the existing air motor mainly includes one. The cylinder 50, a rotating shaft 60 and a plurality of blades 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, and the rotating shaft 60 is rotatably received. In the cylinder 50, the rotating shaft 60 is eccentrically disposed with respect to the cylinder 50, and a plurality of vane slots 62 are radially recessed in the periphery of the rotating shaft 60, and the vanes 70 are movably accommodated in the respective vane slots 62, respectively. After the pressurized gas is introduced into the cylinder 50 from the intake port 51 of the cylinder, the high-pressure gas drives the rotating shaft 60 to rotate by pushing the blade 70, thereby outputting power.

However, the existing edge 70 of the blade 70 has an arcuate curve, so that the bottom 622 of each blade groove 62 of the rotating shaft 60 is also relatively curved, so that the thickness of the near-axis portion of the rotating shaft 60 is thinned by the setting of the blade groove 62. Because during the operation of the air motor, the near-axis portion of the rotating shaft 60 is subjected to a considerable load force, so that the thickness of the shaft portion of the rotating shaft 60 is thinned, so that the overall structural strength of the rotating shaft 60 is weakened, and the rotating shaft 60 is easily damaged. The service life of the air motor is reduced as a whole, so the existing air motor is mostly provided with only six blades 70, and the cylinder 50 is divided into six air chambers to provide sufficient torque to drive the shaft 60 and the tool portion to operate, and The structural strength of the rotating shaft 60 is maintained, but in this way, each of the air chambers in the cylinder 50 has a considerable volume, so that the high pressure gas required for pushing the vanes 60 into the respective air chambers is large, and the use of the high pressure gas is slightly suspected. Waste, and the torque it provides will be limited.

Moreover, if the number of the air cells is increased by increasing the number of the blades 70, and the volume of each air chamber is reduced, the air consumption of the high pressure gas is reduced to increase the torque output by the air motor, but the increase in the number of the blades 70 is further increased. The thickness of the shaft 60 near the axial center is made thinner, so that the structural strength of the rotating shaft 60 is further weakened, and the high load cannot be withstood, and it is easy to be damaged, thereby reducing the overall service life of the air motor.

Therefore, the present inventors have finally developed a present invention that can solve the existing problems in view of the deficiencies and shortcomings of the structure and use of the existing air motor.

The main object of the present invention is to provide a pneumatic motor of a pneumatic tool, which can effectively increase the number of air chambers to reduce the air consumption of high pressure gas, thereby improving the torque provided by the air motor and maintaining the structural strength of the shaft. To achieve the purpose of improving the overall operational efficiency of the air motor.

In order to achieve the above object, the present invention provides a pneumatic motor for a pneumatic tool, comprising: a cylinder, the cylinder is provided with an air inlet and an air outlet; and a rotating shaft is rotatably disposed in the cylinder. Further, the rotating shaft is provided with a plurality of vane slots in a radial recess; a plurality of vanes, each of which is movably received in the vane slot, and one side edge of each vane is placed in the corresponding vane slot, and the other side The edge is exposed outside the groove of the blade, and is characterized in that: at least half of the blade extends into the side edge of the blade groove to have a straight straight section, and a square protrusion is protruded in the middle of the straight section. Further, at least half of the shape of the blade groove corresponding to the straight segment blade forms a straight straight section corresponding to the straight section of the blade groove at the bottom edge of the blade groove, and a relative accommodation is concavely disposed in the middle of the straight section of each blade groove A square recess of the tab on the blade.

By the above technical means, the invention can utilize the straight section formed by the blade and the vane groove to improve the structural strength of the whole shaft, so that the number of the blade and the vane groove can be appropriately increased to increase the number of air chambers in the cylinder. In order to reduce the air consumption, and improve the efficiency of the air motor operation and output torque.

The present invention relates to a pneumatic motor of a pneumatic tool. Referring to FIG. 1 and FIG. 2, it can be seen that the air motor of the present invention mainly comprises a cylinder 10, a rotating shaft 20 and a plurality of blades 30, and the cylinder 10 An air inlet 11 and an air outlet 12 are disposed. The rotating shaft 20 is rotatably disposed in the cylinder 10 and can be eccentric or coaxial with respect to the cylinder 10, and the rotating shaft 20 is concavely provided with a plurality of blade slots. 22, each blade 30 is movably received in the blade groove 22, one side edge of each blade 30 is placed in the corresponding blade groove 22, and the other side edge is exposed outside the blade groove 22, and Each of the vanes 30 extends into the side edge of the vane slot 22 to have a straight straight section 32, and a square tab 34 is protruded from the middle of the straight section 32, and each lug 34 has a length smaller than the vane 30. One-third of the total length, and the shape of each blade groove 22 relative to the blade 30 also forms a straight straight section 222 corresponding to the straight section 32 of the blade 30 at the bottom edge of the blade groove 22, and the straight section 222 of each blade groove 22 A square recess 224 is formed in the middle for receiving the tab 34 on the blade 30.

Therefore, with reference to FIG. 5 to FIG. 7 , since each of the vane slots 22 of the rotating shaft 20 has a straight straight section 222, the shaft 20 can maintain a considerable thickness at the paraxial axis, even though the rotating shaft 22 is opposite to the rotating shaft 22 . The thickness of the recess 224 of the vane groove 222 may be slightly thinner, but the rotating shaft 20 maintains a sufficient thickness with respect to both sides of the recess 224 of the straight section 222, so that the rotating shaft 20 can maintain good structural strength, so that the vane can be appropriately increased. The number of the grooves 22 and the provided blades 30, according to the actual experiment results of the present invention, the rotating shaft 20 of the air motor of the present invention can be provided with 10 or 12 blades, as shown in Fig. 4, the rotating shaft 20 can still maintain a considerable Good structural strength.

Therefore, the air motor of the present invention can increase the number of air chambers in the cylinder 10, and relatively reduce the high pressure gas required for each air chamber, and reduce the amount of gas discharged from the air outlet every time to reduce the air consumption during operation of the air motor. And the high-pressure gas can fully push the blade 30 to drive the rotating shaft 20 to rotate, so as to further improve the torque outputted by the air motor to improve the overall operating efficiency of the air motor. Please refer to FIG. 8. As can be seen from the figure, the bottom surface of the blade groove 22 of the present invention may have a straight section 222, and the bottom surface of the other part of the blade groove 22A may be concavely curved by a curved surface, whereby each blade groove 22, 22A can respectively form the blade 30 having the straight section 32 or the side edge to form a curved shape blade to meet different use requirements. In addition, the number of the blade slots 22 having the straight section 222 is half of the number of all the blade slots 22, 22A. The blade groove 22 having the straight section 222 is spaced apart from the blade groove 22A having no straight section.

It is apparent that the various modifications and changes can be made without departing from the spirit and novel concept of the invention, and the specific embodiments disclosed herein are not intended to limit the invention. All modifications in the scope of the appended patent application.

10‧‧‧ cylinder
11‧‧‧air inlet
12‧‧‧ air outlet
20‧‧‧ shaft
22,22A‧‧‧blade trough
222‧‧‧ straight segments
224‧‧‧ recess
30‧‧‧ leaves
32‧‧‧ straight segments
34‧‧‧Slices
50‧‧‧ cylinder
51‧‧‧air inlet
52‧‧‧air outlet
60‧‧‧ shaft
62‧‧‧blade trough
622‧‧‧ bottom
70‧‧‧ leaves
72‧‧‧ side edge

Figure 1 is a perspective view of the present invention. Figure 2 is an exploded perspective view of a first embodiment of the present invention. Figure 3 is a cross-sectional view showing the first embodiment of the present invention. Figure 4 is a cross-sectional view showing the second embodiment of the present invention. Figure 5 is a side cross-sectional view showing a rotating shaft of a second embodiment of the present invention. Figure 6 is a cross-sectional view of the second embodiment of the present invention taken along the line A-A of Figure 5; Figure 7 is a cross-sectional view of the second embodiment of the present invention taken along the line B-B of Figure 5; Figure 8 is a side cross-sectional view showing a rotating shaft of a third embodiment of the present invention. Figure 9 is an exploded perspective view of a conventional air motor. Figure 10 is a side cross-sectional view of a prior art air motor shaft. Figure 11 is an end cross-sectional view of a conventional air motor.

10‧‧‧ cylinder

20‧‧‧ shaft

22‧‧‧blade trough

30‧‧‧ leaves

32‧‧‧ straight segments

34‧‧‧Slices

Claims (10)

A pneumatic motor of a pneumatic tool, comprising: a cylinder, the cylinder is provided with an air inlet and an air outlet; a rotating shaft, the rotating shaft is rotatably disposed in the cylinder, and the rotating shaft is radially concave a blade groove; a plurality of blades, each of which is movably received in the blade groove, one side edge of each blade is placed in the corresponding blade groove, and the other side edge is exposed outside the blade groove, The utility model is characterized in that: at least half of the blades extend into the side edge of the blade groove to have a straight straight section, and a square-shaped protrusion is protruded in the middle of the straight section, and at least half of the number is relatively straight. The shape of the blade groove of the blade also forms a straight straight section corresponding to the straight section of the blade groove at the bottom edge of the blade groove, and a square concave portion for accommodating the upper blade of the blade is recessed in the middle of the straight section of each blade groove. The air motor of the pneumatic tool of claim 1, wherein more than six blades are disposed on the rotating shaft. A pneumatic motor for a pneumatic tool according to claim 2, wherein twelve blades are provided on the rotating shaft. A pneumatic motor for a pneumatic tool according to any one of claims 1 to 3, wherein the length of the tabs of each of the straight segment blades is less than one third of the total length of the blade. A pneumatic motor for a pneumatic tool according to claim 4, wherein the number of vane slots having a straight section is half of the number of all vane slots. A pneumatic motor for a pneumatic tool according to claim 5, wherein the vane slots having the straight sections are spaced apart from the vane slots having no straight sections. The air motor of the pneumatic tool according to claim 6, wherein the bottom surface of the blade groove without the straight section is curved and curved, and the blade having no straight section extends into the side edge of the blade groove without the straight section. shape. The air motor of the pneumatic tool according to claim 5, wherein the bottom surface of the blade groove without the straight section is curved and curved, and the blade having no straight section extends into the side edge of the blade groove without the straight section. shape. The air motor of the pneumatic tool according to any one of claims 1 to 3, wherein the bottom surface of the blade groove having no straight section is curved and curved, and the blade having no straight section extends into the groove of the blade having no straight section. The side edges are curved. A pneumatic motor for a pneumatic tool according to any one of claims 1 to 3, wherein the shaft is eccentrically disposed relative to the cylinder.