JPH11300638A - Air motor supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rotating failure of a rotor caused by the contact of a side cover with the rotor due to the deformation of the side cover formed of synthetic resin material for weight reduction at the time of fastening housings by screws or the like to press-fix an air motor. SOLUTION: An air motor 6 comprising a pair of side covers 9, 10 fixed to a cylinder 7 and holding a bearing for supporting both ends of a rotor shaft and a rotor 8 rotatably supported in a cylinder 7 is enclosed between two housings 2, 3. Two housings 2, 3 are fastened by fastening means such as screws to press-fix and support the air motor 6 to two housings 2, 3, and an elastic body 22 such as rubber is interposed between the side cover 10 and the housing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air motor supporting device for supporting an air motor used in Japanese Patent Application No. 9-179789 filed by the present applicant.

[0002]

2. Description of the Related Art The above-mentioned application discloses a compressed air screw tightening machine shown in FIG. The compressed air screw tightening machine shown in FIG.
The rotation of the air motor 6 provided above is performed by the planetary gear device 1.
1. The compressed air acting on the piston 15 provided at the lower end of the rotary slide 13 while being transmitted to the rotary slide 13 via the rotating body 12
By lowering and rotating the driver bit 14 attached to the lower end of the rotary slide member 13, the connection screw 1 stored in the magazine 17 is
8 is screwed.

The air motor 6 holds a motor cylinder 7, a rotor 8 rotatably supported in the motor cylinder 7, and a bearing supporting the shaft of the rotor 8, and a pair of side covers 9 fixed to the motor cylinder 7, The air motor 6 is supported between the two housings 2 and 3 by being pressed and fixed to the housings 2 and 3 by fastening the two housings 2 and 3 with screws or the like (not shown). You. The housing 1 forming the handle portion forms an outer frame of the main body together with the housings 2 and 3 and forms a pressure accumulation chamber 5 therein. These housings 1-3
Is sealed by the gasket 4.

When the operation valve 20 provided in the housing 1 is opened, the main valve 21 is opened to supply compressed air into the rotating body 12, the piston 15 is lowered, and the compressed air is supplied through an air passage (not shown). And supplied to the air motor 6 to rotate the air motor 6. 16 is a piston part 15
A cylinder for supporting the cylinder 17 up and down, 19 is a magazine 17
This is a screw feed unit for sending the connection screw 18 inside the driver bit 14 below.

In the air motor 6, the gap between the upper and lower surfaces of the rotor 8 and the side covers 9, 10 is set to be as small as 30 to 50 μm in order to improve the rotation performance. Therefore, the housings 2, 3 are fastened as described above. It is pressed and fixed by fastening means such as screws. In order to reduce the weight of the screw tightening machine body, the motor cylinder 7 and the rotor 8 were changed from steel to aluminum and the side covers 9 and 10 were changed.
Has been changed from aluminum to synthetic resin.

[0006]

The side cover 9,
As described above, the rigidity is reduced due to the use of a synthetic resin material for weight reduction as described above, and the air motor 6 is pressed and fixed, so that the side covers 9 and 10 are deformed as shown in FIG. However, the rotor 8 may not be able to rotate normally.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to be able to support a lightweight air motor with a simple structure without making it impossible to rotate.

[0008]

The above object is achieved by interposing an elastic body such as rubber between one of the side covers and one of the housings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. Reference numeral 22 denotes an elastic body made of rubber or the like provided between the bottom surface of the side cover 10 and the top surface of the housing 2. The elastic body 22 is provided with the side cover 10 and the housing 2.
As a result, even if the housings 2 and 3 are fastened by screws or the like and the air motor 6 is pressed and fixed as described above, the elastic bodies 22 are deformed, and thus the side covers 9 and 10 are deformed. There is no. Therefore, the gap between the upper and lower surfaces of the rotor 8 housed in the motor cylinder 7 sandwiched between the side covers 9 and 10 and the side covers 9 and 10 is maintained at the above value, and the rotor 8 does not become unable to rotate.

In the above-described embodiment, the elastic body 22 is interposed between the side cover 10 and the housing 2, but between the side cover 9 and the housing 3 or between the side covers 9, 10 and the housings 2, 3. May be provided on both sides.

[0011]

As described above, according to the present invention, the air motor can be reliably supported with a simple structure without making it impossible to rotate, and the reliability of the operation of the air motor can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part showing an embodiment in which an air motor supporting device of the present invention is employed in a compressed air screw tightening machine.

FIG. 2 is a cross-sectional side view showing an example of a compressed air screw tightening machine that can be employed by the apparatus of the present invention.

FIG. 3 is a cross-sectional side view showing the air motor support device employed in FIG. 2;

[Description of References] 1-3 are housings, 4 is a gasket, 5 is an accumulator, 6
Is an air motor, 7 is a motor cylinder, 8 is a rotor, 9,
10 is a side cover, 22 is an elastic body.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuo Sasaki 1060 Takeda, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Koki Co., Ltd.

Claims (2)

[Claims] A rotor rotatably supported in a cylinder and bearings supporting both ends of a rotor shaft are held, and an air motor including a pair of side covers fixed to the cylinder is housed between two housings. An air motor supporting device in which an air motor is supported by two housings by tightening two housings with fastening means such as screws, wherein rubber or the like is provided between one of the side covers and one of the housings. An air motor support device comprising an elastic body interposed. 2. The air motor supporting device according to claim 1, wherein the side cover is formed of a synthetic resin.