JP2583818B2 - Air tool silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for reducing exhaust noise and metal noise generated by an air motor of an air tool such as an air grinder and an impact wrench.

[0002]

2. Description of the Related Art Conventionally, in an air tool such as an air grinder and an impact wrench, as shown in FIG.
A porous sound deadening member 13 is disposed in an exhaust port 17 formed in the first exhaust pipe 1, and this is covered with an exhaust port cover 18. As a result, the exhaust of the air motor discharged from the exhaust hole 12b of the cylinder 12a of the air motor 12 is supplied to the chamber 1 formed between the main body case 11 and the cylinder 12a.
4 through the exhaust port 17 formed in the main body case 11, the sound is silenced by the porous silencer 13, and then released into the atmosphere. By the way, in recent years, with the increase in the displacement of the air motor due to the increase in size and performance of the air tool, and the increasing enthusiasm for the improvement of the working environment, the conventional silencer in which a silencer is provided at the exhaust port of the main body case. With the device, the effect of reducing the exhaust noise is insufficient, and to cope with this, a larger silencer must be provided externally, and when using an air tool, the silencer interferes and the work efficiency is reduced. There was a risk of lowering. Further, in the conventional silencer, there is almost no effect of reducing the metal noise generated by the air motor itself, and the metal noise generated by the air motor itself leaks to the outside through the main body case.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the conventional silencer, and can reduce exhaust noise and metal noise generated by an air motor in an air tool. It is an object of the present invention to provide a silencer for an internal air tool that does not cause any trouble.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and comprises a cylindrical porous silencing member provided between an air motor cylinder of an air tool and a main body case. And the inner peripheral surface of the main body case is disposed with a predetermined space therebetween, and the exhaust of the air motor is exhausted through the muffling member.

[0005]

According to the air tool silencer configured as described above, the exhaust of the air motor is passed from the inside to the outside of the cylindrical porous silence member disposed on the outer periphery of the cylinder of the air motor. Reduce exhaust noise. And by arranging the muffling member in the main body case,
Has little effect on the external shape of the air tool,
Further, the surface area of the silencing member can be made large, and there is no possibility that the disposing of the silencing member causes a reduction in working efficiency, a reduction in the driving capability of the air tool itself, and the occurrence of clogging of the silencing member. Furthermore, since the muffling member is provided so as to cover the outer peripheral surface of the cylinder, it is possible to reduce the metallic noise of the air motor generated when the blade of the air motor comes into contact with the cylinder.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. FIG. 1 shows an embodiment in which the noise reduction device for an air tool of the present invention is applied to an air grinder. The air grinder has a known mechanism for transmitting the rotation of the air motor 2 provided in the main body case 1 directly or at a reduced speed via a power transmission mechanism to a grindstone or a polishing member.

[0007] The air motor 2 rotatably supports a rotor 2d having a plurality of blades 2c in a cylinder 2a.
By introducing compressed air from the intake hole 6, the rotor 2d
Is to rotate. The cylinder 2a has an exhaust hole 2b for discharging exhaust gas at a position substantially opposite to the intake hole 6. A cylindrical porous silencer 3 is disposed with a predetermined distance between the outer peripheral surface of the cylinder 2 a of the air motor 2 and the inner peripheral surface of the main body case 1. As a result, an inner chamber 4 defined by the outer peripheral surface of the cylinder 2 a and the muffling member 3 and an outer chamber 5 defined by the inner peripheral surface of the main body case 1 and the muffling member 3 are formed in the main body case 1. An exhaust port 7 is formed on one side surface of the main body case 1 and is covered with an exhaust port cover 8 having slits and a number of holes. In this case, the exhaust port cover can be omitted by directly forming a slit or a large number of holes in the main body case 1.

As a material of the sound deadening member 3, a material having air permeability such as phenol fiber, glass wool, open-cell foamed resin, or the like is used, which is formed into a cylindrical shape and used.

According to the air grinder constructed as described above, when the air motor 2 is driven, the exhaust gas exhausted from the exhaust hole 2b of the air motor 2 spreads over the entire inner chamber 4 and the inner side of the cylindrical silencing member 3. Although the air passes from the entire surface to the outside, the exhaust noise is reduced at this time. Then, the exhaust gas silenced by passing through the silencing member 3 is discharged from the outer chamber 4 to the atmosphere through an exhaust port 7 formed in the main body case 1. Further, when the air motor 2 is driven, the metal noise of the air motor, which is generated when the blades 2c of the air motor 2 come into contact with the cylinder 2a, is reduced by the noise reduction member 3 arranged to cover the outer peripheral surface of the cylinder. Is done.

In the above embodiment, the case where the silencer of the present invention is applied to an air grinder has been described.
The silencer of the present invention can be widely applied to impact wrenches and other air tools. In addition, as a silencer, a conventional silencer is provided in which a porous silencer is provided at an exhaust port 7 formed in the main body case 1 in addition to the cylindrical porous silencer 3, and the porous silencer is covered with an exhaust port cover. It is also possible to add a device.

[0011]

According to the present invention, the exhaust of the air motor is caused to pass from the inside to the outside of the cylindrical porous noise reduction member provided on the outer periphery of the cylinder of the air motor,
Exhaust noise can be effectively reduced. Since the noise reduction member is disposed in the main body case, the external shape of the air tool is hardly affected, and the surface area of the noise reduction member can be increased. The efficiency and the driving capability of the air tool itself are not reduced and the silencing member is not clogged.
Furthermore, since the muffling member is provided so as to cover the outer peripheral surface of the cylinder, it is possible to reduce the metallic noise of the air motor generated when the blade of the air motor comes into contact with the cylinder.

[Brief description of the drawings]

FIG. 1 is a diagram showing a silencing device for an air tool according to the present invention;
(A) is a front view, (b) is the AA sectional view.

FIG. 2 is a view showing a conventional air tool silencer;
(A) is a front view, (b) is the BB sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Air motor 2a Cylinder 2b Exhaust hole 2c Blade 2d Rotor 3 Silencer 4 Inner chamber 5 Outer chamber 6 Intake hole 7 Exhaust port

Claims (1)

(57) [Claims] 1. A cylindrical porous silencing member is disposed between a cylinder of an air motor of an air tool and a main body case while maintaining a predetermined interval between an outer peripheral surface of the cylinder and an inner peripheral surface of the main body case. A muffler for an air tool, wherein the exhaust of the air motor is exhausted through the muffling member.