KR920007258Y1 - Air motor assembly - Google Patents

Abstract

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Description

Air motor

1 is a longitudinal sectional front view showing an air motor according to the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a cross-sectional view taken along line III-III of FIG.

4 is a longitudinal sectional front view of a conventional air motor.

* Explanation of symbols for main parts of the drawings

C ₁ , C ₂ : Air supply 1: Casing

2: Air supply control clip 2a: External cylinder

2b: inner cylinder 3: valve tube

4: outer cover 5: rotor

6: cylinder 11: exhaust passage

12: Air supply control valve

The present invention relates to an air motor used as a driving source for an industrial or dental air grinder, and more particularly, to an air motor capable of simultaneously solving the noise of insulation and exhaust to the outer circumferential surface of the casing.

Conventionally, an air motor used as a drive source for an air grinder or the like, as shown in FIG. 4, forms a casing 103 incorporating the rotor 101 and the cylinder 102 by metal, and the casing 103 The front end portion 105 of the small diameter valve tube 104 is integrally connected to the inner portion of the rear end opening by screwing, and the air supply 106 and the cylinder 102 formed in the valve 104 tube are integrally connected. ) Air supply 107 is connected.

Moreover, the air supply control creep 108 of the double cylinder structure comprised as the inner cylinder 108b and the outer cylinder 108a is screwed in the outer periphery of the said valve 104 tube, and the front end of the said inner cylinder 108b is casing | 103 is fitted in the inner circumference of the rear end hole and closely fitted with a rotating material, and the exhaust gas from the exhaust port 109 of the cylinder 102 is discharged between the inner cylinder 108b and the outer cylinder 108a of the air supply control clip 108 described above. An exhaust path 110 that discharges toward the rear is formed.

Then, the air supply control clip 108 is rotated to open and close the air volume control valve 111 configured between the inner cylinder 108b of the clip 108 and the valve tube 106 to the cylinder 102. It is to regulate the air supply.

In the above-described configuration, the motor generates heat from the rotor 101, the rotating shaft 112, the tool 113, and the like during high-speed rotation, and compresses through the cylinder 102 to rotate the rotor 101. Air-cooled by air.

The air cooling depends on the room temperature at which the work is performed, and when the work is performed at a high room temperature, the effect of air cooling is low, so that the metal casing 103 gradually becomes a high temperature, and conversely, when the room temperature is low, the air cooling is excessive. Thus, the casing 103 becomes excessively low temperature.

Therefore, when the user works while holding the casing 103, the user will work while enduring the casing 103 temperature which is high or low as described above.

In addition, the exhaust path between the valve tube and the air supply control clip is a portion that becomes the same noise space as the muffler of the internal combustion engine. Since the inner diameter of the feed control clip screwed inside the casing rear end is limited, the volume is likely to be insufficient, and thus the noise effect is low.

As described above, when the volume in the exhaust passage 110 is insufficient, the exhaust efficiency decreases, the pressure in the exhaust passage 110 increases, and at the same time, the tip end of the inner cylinder 108b is closely connected to the inner peripheral surface of the casing 103. As the additional exhaust stream is faced, a part of the exhaust leaks from the above-mentioned close portion e to generate a high air leak sound, which is also a cause of exhaust noise.

In the rotor 101 which rotates at a high speed again, vibrations of high frequency were generated, which were transmitted to the casing 103 made of a metal material, which became a resonance sound.

The present invention improves the noise effect in the exhaust passage by preventing the outer casing outer surface of the metal casing from being extremely heated or cooled in the air motor having the above-described configuration, and increasing the volume of the exhaust passage. At the same time, the object of the present invention is to reduce exhaust noise by eliminating air leaks, which are high noises generated by air leakage at the air supply control clip contact portion.

In order to solve the above problems, the air motor of the present application covers an outer cover of a synthetic resin on the outer circumference of a metal casing incorporating a rotor and a cylinder, and integrally connects a valve tube in the rear end of the casing, thereby providing Connect the air supply line formed in the air supply line with the air supply line of the cylinder, and screw the air supply control clip of the double cylinder structure as the inner cylinder and the outer cylinder to the outer periphery of the valve tube. Air supply volume control valve for controlling the opening and closing of the cylinder, and forming an exhaust path for exhausting the exhaust from the exhaust port of the cylinder to the rear side between the inner cylinder and the outer cylinder. It is fitted to the outer circumference of the rear end of the casing and closely fitted to the rear end of the outer cover in which the outer diameter is expanded to the outer circumference of the outer cylinder front end.

According to the above means, the outer cover which is covered on the outer circumference of the metal casing reduces the heat conduction between the outer circumferential surface of the casing and the user's hand by the heat insulating property of the synthetic resin, and blocks the resonance sound of the rotor transmitted to the casing. .

Then, the air supply adjusting clip of the double cylinder structure is screwed into the outer circumference of the valve tube, and the outer cylinder end opening of the clip is fitted to the rear end of the casing and the outer circumference so that at least the inner diameter of the outer cylinder is larger than the outer diameter of the casing. Is formed.

Therefore, the volume of the exhaust passage formed between the outer cylinder outer circumference and the outer cylinder outer circumference increases, thereby increasing the expansion ratio of the exhaust gas in the exhaust passage, thereby reducing the internal pressure of the exhaust passage and reducing the noise effect and the exhaust effect. Is improved.

The rear end portion of the outer cover formed by expanding the outer diameter is closely fitted to the outer circumference of the outer cylinder tip end, and the exhaust force is prevented by the close force.

In addition, the above-mentioned close part and the exhaust path are divided by the rear end of the casing, and are isolated from the exhaust flow flowing in the exhaust path.

As described above, the air motor of the present invention has increased the volume in the exhaust passage than the conventional one by fitting the air supply adjusting clip to the outer circumference of the casing.

Therefore, the noise efficiency in the exhaust passage can be improved, and the exhaust efficiency can be increased to sufficiently lower the pressure in the exhaust passage.

In addition, since the pressure in the exhaust passage is lowered, it is possible to prevent the occurrence of air leakage at the close portion of the air supply control clip and the exterior cover due to the internal pressure of the exhaust passage. The part is divided in the exhaust path by the casing rear end portion, whereby a high-speed exhaust flow directly touches the close part to prevent the air leak. Therefore, the air leak can be prevented and the exhaust noise can be prevented with the above noise effect. Noise can be effectively reduced.

In addition, since the outer circumferential surface of the casing having high thermal conductivity is insulated by fitting the outer cover of the synthetic resin to the outer circumference of the metal casing, the outer circumferential surface of the main body of the air motor in contact with the user is prevented from being extremely heated or cooled, thereby making it workable. Can improve.

In addition, since the outer cover has a function of blocking the resonance sound of the rotor transmitted to the metal casing, it also contributes to noise reduction.

EXAMPLE

Hereinafter, an embodiment of an air motor of the present invention will be described with reference to the drawings.

The air motor shown in FIGS. 1 to 3 is used as a driving source for an industrial or dental air grinder, and is compressed in the air supply hose b connected to the rear end of the air motor body a. By injecting air through the air supply path and injecting into the cylinder 6 embedded in the casing 1, the rotor 5, the rotary shaft 9 and the tool 10 integrated therewith are rotated at a high speed, and The exhaust gas which passed through the cylinder 6 was discharged | emitted to the exterior from the exhaust path 11 of the rear part of the main body a.

The casing 1, which is formed in a substantially fan shape, is made of metal, and its outer circumference is polygonal, and is formed by detachably screwing contact with the cylindrical eastern portion 1a and the tapered handle portion 1b at the middle portion thereof. The rotor 5 and the rotating shaft 9 are bearing-supported by the shaft center part inside.

The rotor 5 and the rotating shaft 9 are integrally formed, and are supported by the bearings 14a of the support body 14, in which the support shaft 5a at the rear end of the rotor 5 is inserted into the casing 1 from the rear. In addition, the rotor shaft 9 and the shaft 9 are supported by the bearing 15 fitted to the threaded portion of the casing 1 so that the rotor 5 and the shaft 9 are rotated at the shaft center portion of the casing 1. have.

A chuck is installed at the tip of the rotating shaft 9, and the cutting tool 10 is detachably mounted.

The cylinder 6 accommodating the rotor 5 is formed by establishing a positional relationship in which the injection holes 7 and the exhaust holes 8 parallel to the main wall surface in parallel are arranged, and the rotor 5 is arranged. A predetermined amount was eccentrically loosened on the outer circumference of the substrate, and was sandwiched between the supports 14 and 14 and the partition 16 in the casing dynamic portion 1a.

A flange portion 3a at the tip of the valve tube 3 is connected to the inner portion in the rear end of the casing moving portion 1a by screwing so as to press the support body 14 forward, and is integrated with the casing 1. It is.

The valve tube 3 is a small diameter tube that draws the compressed air from the air supply hose b into the casing 1, and the air intakes C ₁ , C ₁ , which are blocked by the partition wall 16, are disposed therein. '), The flange portion 3a was provided on the outer periphery of the tip portion, and at the rear end, a connection port 3b for connecting the air supply hose b was formed.

In addition, while forming a handguard-shaped valve 12a on the outer circumference of the partition 3c portion of the valve pipe 3 described above, the inner cylinder body with the valve portion 12 ( 2b) The air supply amount regulating valve 12 is constituted between the stepped portion 12b.

The air supply control clip 2 is a double cylinder which serves as an inner cylinder 2b which is screwed on the outer circumference of the valve tube 3 and an outer cylinder 2a that doubles through a gap which becomes the exhaust passage 11 on the outer circumference. Structure.

The inner and outer cylinders 2a and 2b are integrally connected to each other via the support portion 2c of the rear end portion, and the inner cylinder 2b is sealed to the outer circumference of the valve tube 3. And (17b) are interposed and fitted to the bare part 13c in the middle of the valve tube 3.

In the above state, the distal end portion of the inner cylinder 2b is inserted into the casing cylinder portion 1a into the rear end mouth, and the distal end portion of the outer cylinder 2a is formed on the outer end peripheral edge of the casing cylinder portion 1a. It was configured to fit.

A stepped portion 12b is formed on the inner circumference of the inner cylinder 2b, and the air supply amount regulating valve 12 is formed by moving the stepped portion 12b inward with the valve portion 12a of the valve tube 3. .

Therefore, when the air supply control clip 2 is rotated and moved in the axial direction, the gap between the stepped portion 12b and the valve portion 12a is changed, and the air supply volume control valve 12 is opened at the vent hole 18. It controls the amount of compressed air flowing by bypass.

Moreover, the air supply passage which sends the compressed air supplied from the connection port 3b of the valve tube 3 to the injection hole 7 of the cylinder 6 is an air supply passage C ₁ inside the valve tube 3. The air supply volume control valve 12 is bypassed through the pores 18 and 18 ', and the cylinder 6 passes through the through hole C ₂ formed in the support 14 at the air supply C ₁ ′. It was configured to reach the hollow hole (C ₃ ) along the outer periphery.

The compressed air injected into the cylinder 6 from the injection hole 7 through the above-described air supply passage is applied to the rotor 5 and then discharged from the discharge hole 8 toward the exhaust system path.

Then, the exhaust passage, each outlet support (14) in the longitudinal hole 6 is formed along the outer side of the ball 8 and the valve tube 3, the flange portion (3a) of the outer through-hole (d _2), (d ₃ Pass through) through the exhaust passage (11).

As described above, the exhaust passage 11 is a space for removing noise caused by the exhaust flow, and the outer circumference of the inner tube 2b screwed into the outer circumference of the valve tube 3 and the tip end portion of the outer circumference of the casing dynamic portion 1a. It is formed between the inner circumference of the fitted outer cylinder 2a, and the sound-absorbing material 13 of a fibrous structure is built in the inside, and exhaust passes through the inside of the sound absorbing material 13, and it is after the exhaust path 11. The discharge port 11a is discharged toward the exhaust hose b2 connected to the rear end of the air supply control clip 2.

As described above, by fitting the outer cylinder 2a of the feed control clip 2 to the outer side of the casing dynamic portion C ₃ , compared with the conventional one that fits the leading end of the clip into the rear end of the casing, The inner diameter of the outer cylinder 2a can be enlarged at least more than the casing thickness share.

Therefore, the volume in the exhaust passage 11 is increased, so that the expansion ratio of the exhaust gas in the exhaust passage 11 is increased, thereby improving the noise effect and increasing the exhaust efficiency, thereby increasing the exhaust efficiency in the exhaust passage 11. It is possible to sufficiently reduce the pressure generated.

As described above, the rear end portion of the outer cover 4 compared with the outer circumference of the casing 1 is closely fitted to the outer circumference of the outer end of the outer cylinder 2a fitted to the outer circumference of the rear end of the casing cylinder 1a. It was.

The outer cover 4 is formed by using a synthetic resin having excellent heat insulating properties. The outer cover 4 is divided into two parts in the same manner as the casing 1, and is fixed to the outer peripheries of the handle portion 1b and the eastern portion 1a. Further, the rear end portion 4a on the eastern side 1a swells from the outer periphery of the casing 1, and the rear end portion 4a is formed on the outer circumferential surface of the end portion of the outer cylinder 2a as described above. By closely closing, the exhaust gas which passed through the exhaust path 11 was prevented from leaking.

The airtightness of the close portion is not as high as that of the airtight portion through the packing, but as described above, the exhaust efficiency of the exhaust passage 11 is improved to suppress the pressure in the exhaust passage 11 sufficiently low, so that the close portion is close. There is no air leakage and noise is generated.

In addition, the above-mentioned close part is partitioned with respect to the exhaust path 11 by the rear end part of the casing dynamic part 1a, and the exhaust which directly flows into the exhaust path 11 at high speed like the conventional one directly touches, and an air leak It is also possible to prevent such a thing from being promoted, so that the exhaust noise can be reduced by interacting with the above-mentioned increase in the noise effect.

Depending on the conditions of use, the metallic casing 1 may be overheated or cold. However, as described above, the outer peripheral surface of the casing 1 is covered with an outer cover 4 made of synthetic resin having excellent thermal insulation to insulate it. As a result, the outer circumferential surface of the air motor body (a) in contact with the user can be prevented from being extremely heated or cooled.

In addition, the outer cover 4 also has a function of blocking the resonance sound of the rotor 5 transmitted to the casing 1, thereby reducing the rotor sound leaking to the outside.

Claims (1)

Cover the outer casing (4) made of synthetic resin on the outer circumference of the metal casing (1) containing the rotor (5) and the cylinder (6), and integrally connect the valve pipe (3) in the rear end of the casing (1). The air supply path formed in the valve pipe 3 and the air supply port of the cylinder are brought into contact with each other, and the air supply control of the double cylinder structure serving as the inner cylinder 2B and the outer cylinder 2a on the outer circumference of the valve tube 3 The clip 2 is screwed in to form an air supply flow rate regulating valve 12 that opens and closes the air supply path by the inner cylinder and the valve tube 3, and the inner cylinder 2b and the outer cylinder 2a. And an exhaust path 11 for exhausting the exhaust gas from the exhaust port of the cylinder to the rear. An air motor in which the distal end of the outer cylinder is fitted with the outer circumference of the casing rear end, and the rear end of the outer cover 4 is formed with the outer circumference of the outer cylinder distal end.