KR100385144B1 - Air motor - Google Patents

Abstract

The present invention provides an air motor (AM) that can simplify the structure, reduce the processing cost and reduce the weight,

In the main body constituting the air motor, the cylindrical cylinders inserted into the upper and lower hard plates are eccentrically arranged, and the stator 11 is disposed in the space 10 formed between the main body inner wall and the outer wall of the cylinder, and the stator 11 is disposed. ) Is provided with a passage 13 for communicating air from the introduction port 2 formed in the main body to the introduction hole on the cylinder side, and an O-ring 13a for maintaining the airtightness of the passage around the entrance and exit of the passage. Characterized in that made.

Description

Air motor {AIR MOTOR}

The present invention relates to, for example, an air motor suitable for a portable air tool and the like, and more particularly, to an air motor capable of simplifying a structure, reducing processing cost, and reducing weight.

The structure of the conventional air motor will be described in more detail with reference to FIG. 4. FIG. 4 is a cross-sectional view of a conventionally known reversible air motor (US Patent No. 271588).

In FIG. 4, the air motor is provided with the cylindrical motor housing 51, and the stator 52 is arrange | positioned in this motor housing 51. As shown in FIG. The stator 52 is composed of an integral member as shown in the drawing, and forms a hole 53 at an eccentric position from the center portion, and a plurality of inlet ports 55a and 55b communicating with the hole 53. An exhaust port 56 is formed. In the eccentric hole 53 formed in the stator 52, a valve sleeve 59 (hereinafter referred to as a cylinder) is disposed, which is formed in the stator by a spring clip 57 and a screw 58. It is pressed to enable rotational movement. In the cylinder 59, the rotor 60 is arrange | positioned concentrically with the central axis of the motor housing 51, and the four blades 61 which penetrate in the centrifugal direction are arrange | positioned at the rotor 60 at equal intervals. An output shaft or the like is attached to the rotor 60 to be used for an air motor of a portable air tool.

When the air is introduced between the blades 61 from the inlet port 55a in the state of the city, the air 60 can rotate the counterclockwise in the drawing to drive the output shaft. Further, when the motor housing 51 is rotated relative to the stator 52 from the illustrated position, air is introduced between the blades from the other inlet port 55b and the rotor 60 is rotated in the opposite direction to the above. It is supposed to be. In addition, since the operation of this motor is the same as that of a conventional air motor, a detailed description thereof will be omitted.

However, similarly to the general air motor, the above-described air motor is machined with an eccentric hole for cylinder fitting in the stator member as described above, so that it takes time to process the eccentric hole. In addition, since a high processing precision is required for the external shape of the stator and the machining of the eccentric hole, the cost of manufacturing the stator is very expensive. Moreover, since it is comprised so that the cylinder may surround the circumference | surroundings, there also exist a problem that weight reduction of components is difficult.

Therefore, in order to solve the problems as described above, the present invention has a cylindrical cylinder disposed eccentrically in the motor housing, and a resin stator is placed in a crescent-shaped space formed between the inner wall surface of the motor housing and the outer wall surface of the cylinder. It is an object of the present invention to provide an air motor which can be easily machined and realizes a lighter weight and a lower cost of the air motor by eliminating the stator having an eccentric hole provided in the member as described above.

According to the present invention, a cylindrical cylinder composed of a tube or the like is disposed eccentrically in a cylindrical motor housing, and a resin stator is disposed in a space formed between the inner wall of the motor housing and the eccentric cylindrical cylinder. The stator is provided with a passage for communicating air from the introduction port formed in the motor housing to the introduction hole on the cylinder side, and an O-ring is disposed around the passage to maintain the airtightness of the passage. Since the function of positioning the cylinder is performed by pushing the cylinder toward the inner wall surface side of the motor housing, high processing precision is not required for the air motor of the present invention, and the cost of the air motor can be greatly reduced. In addition, since the stator is partly provided, the resin can be easily molded, thereby reducing manufacturing costs and significantly reducing the air motor.

Technical solution employed by the present invention for achieving the above object,

In the main body constituting the air motor, a cylindrical cylinder inserted into the upper and lower hard plates is eccentrically disposed, and a stator is disposed in a space formed between the main body inner wall and the outer wall of the cylinder, and the stator is formed from an inlet port formed in the main body. The air motor is formed by forming a passage in which air is communicated with the introduction hole on the cylinder side, and an O-ring for maintaining the airtightness of the passage around the entrance and exit of the passage.

1 is a plane cross-sectional view (B-B cross-sectional view in FIG. 2) of an air sander using the present air motor.

2 is a front cross-sectional view (A-A cross section in FIG. 1) of an air sander using the present air motor.

3 is an exploded perspective view of the present air motor.

4 is a cross-sectional view of a conventional air motor.

※ Explanation of symbols for main parts of drawing

1: motor housing (main body) 2: introduction port

3: exhaust port 4: suction port

5, 6: Slate 7: Rotor

8: rotor shaft 9: cylinder

10: space 11: stator

12: introduction hole 12a: discharge groove

13: passage 14: power train

15: abrasive member 15a: pad

15b: polishing paper 16: output shaft

17: switch lever 18: valve

Referring to the drawings the structure of the air motor according to the present invention will be described with reference to Figure 1 is a planar cross-sectional view of the air sander using the air motor according to the present invention, Figure 2 is a front cross-sectional view, Figure 3 is an exploded view of the air motor.

In the drawing, 1 is the main body (motor housing) of the air sander, and the inlet port 2 and the exhaust port 3 of the compressed air are integrally formed on the side of the motor housing 1 as shown in FIG. .

Moreover, in the motor housing 1, as shown to FIG. 2, FIG. 3, the 1st light plate 5 and the 2nd light plate 6 are arrange | positioned apart up and down in the figure, and between these light plates 5,6. The cylinder 9 is arranged in a state of being eccentric with respect to the motor housing 1, and the rotor 7 is arranged concentrically with the motor housing 1 in the cylinder 9 and fixed by the lock ring. At this time, the cylinder 9 abuts and fixes one end of the circumferential end portions 5a, 6a formed on the two hard plates 5, 6, respectively. In the cylinder 9, the rotor 8 is arranged concentrically with the motor housing 1, and the rotor shaft 8 supporting the rotor 7 is provided with the bearings 8A and 8A. It is axially supported by 8B). The cylinder 9 cuts a tube or the like having a predetermined diameter into a predetermined length, and an air introduction hole 12 is formed at a predetermined position.

Five blades 7A are arranged freely in the rotor 7 at equal intervals in the circumferential direction and with respect to the centrifugal direction of the rotor 7, and the tip of each blade 7A is airtight on the inner wall surface of the cylinder 9. Also sliding freely abuts. In addition, in the space 10 formed between the cylinder 9 and the motor housing 1 arranged eccentrically with respect to the motor housing 1, the stator 11 for supporting the cylinder 9 in an eccentric state in the motor housing is provided. Is arranged.

As shown in Figs. 1 and 3, the stator 11 is provided with a passage 13 for supplying air from the introduction port 2 formed in the motor housing 1 to the rotor 7 side. O-rings 13a and 13b are disposed around the passage 13 between (1) and the stator 11 and between the stator 11 and the cylinder 9, and these O-rings 13a and 13b. In this way, the periphery of the inlet side and the outlet side of the passage 13 formed in the stator 11 is kept in an airtight state. In addition, since the O-rings 13a and 13b themselves have elasticity, the elastic force is used to push the cylinder 9 toward the motor housing 1 inner wall surface side, whereby the motor housing 1 The positioning function of the cylinder 9 in the inside is realized. At this time, the projections 13b and 13c formed on the upper and lower sides of the stator 11 are fitted into the engaging holes 5b and 6b provided in the hard plates 5 and 6, and at the same time contact with one ends of the circumferential ends 5a and 6a. Is fixed.

The hard plates 5 and 6 are provided with discharge grooves 12a through which the air introduced into the cylinder 9 is discharged out of the cylinder through the introduction holes 12 provided in the cylinder 9, and the cylinder 9 And the space 10 formed between the motor housing 1 and the exhaust port 3 communicate with the exhaust port 3 to exhaust air discharged from the discharge groove 12a of the hard plates 5 and 6 from the exhaust port 3 to the outside. The air motor is constituted by them.

The end of the rotor shaft 8 supporting the rotor 7 is attached with a polishing member 15 via a power transmission mechanism 14, the output shaft 16 of the power transmission mechanism 14 is a rotor shaft ( It is installed eccentrically by a certain dimension with respect to 8). For this reason, it is possible to rotate at high speed while moving the polishing member 15 around the rotor shaft 8. The polishing member 15 has a structure in which the polishing paper 15b is attached to the lower surface of the disk-shaped pad 15a.

The inlet port 2 of the motor housing 1 is provided with a valve 18 that opens and closes through a rod (not shown) pressed by the switch lever 17. When the switch lever 17 is pressed down, the valve ( 18 is opened and a passage from the introduction port 2 to the rotor 7 of the air motor is passed through the passage 13 formed in the stator 11 through the introduction hole 12 formed in the cylinder 9. Compressed air is supplied to the air motor. In addition, when the switch lever 17 is opened, the valve 18 is closed to block the air passage, and the compressed air is not supplied to the air motor, and thus the air motor does not operate. In the exhaust port 3, a flow path 19a communicating with the exhaust port 3 at one end and a muffler 19 having a noise member 19b at the other end thereof are detachably installed.

The operation of the air sander having the above configuration will be described.

When the operator pushes down the switch lever 17 downward in FIG. 2, the valve 18 opens through the rod, and an air passage from the introduction port 2 to the air motor communicates with the compressed air passing through the passage 13. The air is supplied from the hole 12 to the air motor. When the air motor rotates, the disk 15a on the disk also rotates at high speed while moving its center around the output shaft of the air motor through the power transmission mechanism 14, and the polishing paper 15b attached to the bottom surface of the pad 15a. The polished object is polished by. Exhaust air from the air motor passes through the exhaust grooves 12a formed in the light plates 5 and 6 and from the muffler 19 to the outside via the space 9 of the cylinder 9 and the motor housing 1. Discharged.

However, since the air motor in the air sander has a configuration in which the stator is partially arranged in a space formed between the cylindrical cylinders arranged eccentrically in the motor housing 1, the structure of the air motor can be simplified and reduced in weight. Can be planned.

As mentioned above, although the example which used the air motor which concerns on this invention for an air sander was demonstrated, it is natural that this air motor can be used instead of the air motor used for various tools, and the spacer is limited to resin property. For example, it can also comprise by die-casting using aluminum material, for example. The cylinder can also be easily formed by cutting the tube.

In addition, this invention can be implemented in other various forms, without deviating from the mind or main characteristics, and the said Example is only a mere illustration in all the points, and should not interpret it limitedly.

As described in detail above, according to the present invention, the cylindrical cylinder is arranged eccentrically in the motor housing, and the stator is arranged in the space created between the inner wall of the motor housing and the outer wall of the eccentric cylindrical cylinder. The structure of the air motor can be simplified and the weight can be reduced. The stator is provided with a passage for communicating air from the introduction port formed in the motor housing to the introduction hole on the cylinder side, and an O-ring is disposed around the passage to maintain the airtightness of the passage. The function of pushing the cylinder to the inner wall surface side of the motor housing by the elastic force of the ring itself enables the positioning of the cylinder. As a result, the stator is not required to have high processing accuracy as in the conventional stator, and it is possible to significantly reduce the cost of the air motor. In addition, since the stator can be molded with a resin or the like, excellent effects such as reduction in manufacturing cost and significant weight reduction of the air motor can be exhibited.

Claims (2)

In the main body constituting the air motor, the cylindrical cylinders inserted into the upper and lower hard plates are eccentrically disposed, and the stator is disposed in a crescent space formed between the main body inner wall and the outer wall of the cylinder, and the stator is formed on the main body. A passage is formed for communicating air from the introduction port to the introduction hole on the cylinder side, and an O-ring for maintaining the airtightness of the passage is disposed around the entrance and exit of the passage, and the cylinder is formed by the elastic force of the O-ring. An air motor characterized in that the cylinder is positioned by pushing against the side. The upper and lower hard plates are provided with a circumferential end for fastening the cylinder, and at the same time, form a discharge groove for discharging air introduced into the cylinder through the introduction hole provided in the cylinder to the outside of the cylinder. An air motor, characterized in that the projections formed above and below the stator are inserted into the engaging holes provided on the hard plate and fixed to one end of the circumferential end thereof.