JPH09242767A - Bearing device of rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce transmission of vibration of a shaft to a casing by damping it by bearings. SOLUTION: A first gear 4 meshing with a pinion 3 on the tip of a shaft 11a and a second gear 6 meshing with a second pinion 5 coaxial with the first gear, are arranged in a gear case 2 fitted to a bracket 1 of an electric motor. Both end of a shaft 11b to fix the first gear 4 and the second pinion 5 are supported by bearing boxes 13a and 13b through rolling bearings 12b and 12c. Both end of a shaft 11c to fix the second gear 6 are supported by bearing boxes 13c and 13d through a sliding bearing 12d and a rolling bearing 12e. A cylinder 15a composed of a vibration damping material is interposed and installed between the rolling bearing 12b and the bearing box 13a, between the bearing 12c and the bearing box 13b and between the bearing 12e and the bearing box 13d, and a flange 15f is integrally formed in the cylinder 15a. Cylinders 15b and 15c are also arranged on the bearings 12c and 12d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device such as a rolling bearing or a sliding bearing which supports a shaft of a rotary machine such as an electric motor or a gear device.

[0002]

2. Description of the Related Art In an electric motor, vibration due to unbalance of a rotor or electromagnetic vibration is transmitted to a frame or a bracket as a jacket through a shaft and a bearing and becomes a source of noise. In the gear device, the vibration due to the meshing of the gears is transmitted to the casing, which is the jacket, through the shaft and the bearing, and becomes a source of noise.

Therefore, in the conventional structure for preventing the vibration of the shaft or bearing having the rotating body, the bearing box in which the bearing is fitted is attached to the outer casing via the damping material, or the outer casing itself is made of the damping material. Configure or attach the jacket to the installation base or the mating machine via damping material. The damping material is intended to lower the peak of the natural vibration of the plate, such as sandwiching a resin such as bituminous between metal plates such as steel, forming a rubber film on both sides of the metal plate, different types A multi-layered material such as a metal clad material is well known. There is also a single resin layer.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing device for a rotary machine capable of suppressing the vibration of the shaft near the bearing to reduce the transmission of the vibration to the jacket.

[0005]

In a bearing device for a rotary machine according to a first aspect of the present invention, a cylinder made of a vibration damping material is interposed between a bearing which is fitted into a bearing box and supports a shaft. It is a thing.
According to the bearing device for a rotary machine of the invention 1, the cylinder made of the damping material interposed between the bearing and the bearing housing suppresses the vibration of the shaft and reduces the transmission of the vibration to the jacket. To do.

A bearing device for a rotary machine according to a second aspect of the present invention is such that a cylinder made of a vibration damping material is interposed between a shaft bearing and a shaft. According to the bearing device of the rotary machine of the invention 2,
The cylinder made of a vibration damping material interposed between the bearing and the shaft damps the vibration of the shaft and reduces the transmission of the vibration to the jacket.
A third aspect of the invention is the same as the first or second aspect, in which the flange is integrally formed with the cylinder.

According to the third aspect of the invention, the flange damps the vibration of the shaft at the abutment portion in the axial direction with the bearing box or the shaft, and reduces the transmission of the vibration to the jacket. A fourth aspect of the present invention is the same as the first, second or third aspect, in which the cylinder and the flange are circumferentially separated by one or more separation surfaces. According to invention 4,
Since the cylinder and the flange are separated in the circumferential direction at the separation surface, the cylinder can be mounted in the circumferential groove of the bearing box or the shaft.

A fifth aspect of the present invention is the same as the first aspect, wherein an outer flange is integrally formed at one end of the cylinder and an inner flange is integrally formed at the other end. According to the fifth aspect of the invention, the cylinder having the outer flange and the inner flange has an increased rigidity and can itself form the bearing box.

[0009]

1 is a sectional view of a first embodiment, FIG. 2 is a sectional view of a second embodiment, FIG. 3 is a sectional view of a third embodiment, and FIG. 4 is a sectional view of a fourth embodiment. In the drawings, the parts denoted by the same reference numerals have substantially the same functions, and description thereof may be omitted. In the first embodiment shown in FIG. 1, the motor shaft 11a is supported on the motor bracket 1 by the rolling bearing 12a. In a gear case 2 that fits in the bracket 1, a first gear 4 that meshes with a pinion 3 at the tip of the shaft 11a and a second gear 6 that meshes with a second pinion 5 coaxial with the pinion 3 are arranged. First
Shaft 1 for fixing gear 4 and second pinion 5 coaxial therewith
Both ends of 1b are supported by bearing housings 13a and 13b via rolling bearings 12b and 12c. Both ends of the shaft 11c for fixing the second gear 6 are a sliding bearing 12d and a rolling bearing 12e.
Is supported by the bearing boxes 13c and 13d.

Up to this point, the conventional electric gear device has been used.
A feature of this embodiment is that, in relation to the shaft 11b, a cylinder 15a made of a damping material is interposed between the rolling bearing 12b and the bearing housing 13a to integrally form a flange 15f on the cylinder 15a. Also between the rolling bearing 12c and the bearing housing 13b,
A flange 15f is integrally formed with the cylinder 15a by interposing a cylinder 15a made of a damping material. Between the bearing 12c and the shaft 11b, a cylinder 15b made of a damping material is interposed, and a flange 15g is integrally formed on the cylinder 15b. Then, in relation to the shaft 11c, a cylinder 15c made of a damping material is interposed between the slide bearing 12d and the bearing housing 13c. Between the rolling bearing 12e and the bearing housing 13d, a cylinder 15a made of a damping material is interposed and a flange 15f is integrally formed on the cylinder 15a.

According to the first embodiment, the bearings 12b, 12c,
12d, 12e and bearing boxes 13a, 13b, 13c, 13
The cylinder 15a made of a vibration damping material interposed between d and the vibration damps the vibrations of the shafts 11b and 11c and reduces the transmission of the vibration to the bracket 1 and the gear case 2 which are the jackets. Further, the cylinder 15b made of a damping material interposed between the bearing 12c and the shaft 11b suppresses the vibration of the shaft 11b and reduces the transmission of the vibration to the jacket. Then, the tubes 15a, 15
The flanges 15f and 15g of b are the bearing boxes 13a and 13g.
b, 13d or the vibration of the shaft at the abutting portion in the axial direction with the shaft 11b, 11c is suppressed, and the transmission of the vibration to the jacket is reduced.

In the second embodiment shown in FIG. 2, the bearing 12a
And a cylinder 15b made of a damping material interposed between the shaft 11a having the groove 16 and the shaft 11a is circumferentially separated by the separation surface 15s. According to the second embodiment, the cylinder 15b is circumferentially separated by the separation surface 15s, so that the cylinder 15b can be mounted in the circumferential groove 16 of the shaft 11a. The separation surface 15s may be one or more in the circumferential direction, and the one having the flange 15g is separated together with the flange.

In the third embodiment shown in FIG. 3, the bearing 12a
And a shaft 11a having a groove 16m and a cylinder 15b made of a vibration damping material, which is circumferentially separated by a separation surface 15s, and a bearing box 13 having a bearing 12a and a groove 16n.
A cylinder 15a made of a vibration damping material, which is interposed between a and a, is separated in the circumferential direction by a separation surface 15t. The width of the grooves 16m and 16n may be narrower than the width of the bearing 12a.

In Embodiment 4 shown in FIG. 4, an outer flange 15i is integrally formed at one end of a cylinder 15a, and an inner flange 15h is integrally formed at the other end. The tubular body 15j and the mounting flange 15k are integrally formed on the outer flange 15i, and the bracket 1 is attached with the screw 17.
The outer flange 15i may be attached to the bracket 1 as appropriate. A shaft 11c is supported by the cylinder 15a via a slide bearing 12d. Rolling bearings can also be used.

According to the fourth embodiment, the cylinder 15a having the outer flange 15i and the inner flange 15h is reinforced in rigidity and can itself form a bearing box.

[0016]

According to the bearing device of the rotating machine of the invention 1,
The cylinder made of the vibration damping material interposed between the bearing and the bearing housing has the effect of damping the vibration of the shaft and reducing the transmission of the vibration to the jacket. According to the bearing device for a rotary machine of the invention 2, the cylinder made of the damping material interposed between the bearing and the shaft damps the vibration of the shaft and reduces the transmission of the vibration to the jacket. There is an effect.

According to the third aspect of the invention, the flange has an effect of damping the vibration of the shaft at the abutment portion in the axial direction with the bearing box or the shaft, and reducing the transmission of the vibration to the jacket. According to the invention 4, since the cylinder and the flange are separated in the circumferential direction by the separation surface, there is an effect that the cylinder can be mounted in the circumferential groove of the bearing box or the shaft. According to the fifth aspect of the invention, the cylinder having the outer flange and the inner flange has an effect that the rigidity is strengthened and the bearing box itself can be configured.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

FIG. 3 is a cross-sectional view of a third embodiment.

FIG. 4 is a sectional view of a fourth embodiment.

[Explanation of symbols]

 1 bracket 2 gear case 3 pinion 4 first gear 5 second pinion 6 second gear 11a shaft 11b shaft 11c shaft 12a bearing 12b bearing 12c bearing 12d bearing 12e bearing 13a bearing box 13b bearing box 13c bearing box 13d tubular bearing box 15a Tube 15s Separation surface 15t Separation surface 16 Groove 16m Groove 16n Groove 17 Screw

Claims (5)

[Claims] 1. A bearing device for a rotary machine, characterized in that a cylinder made of a damping material is interposed between a bearing which is fitted in a bearing box to support a shaft and a bearing box. 2. A bearing device for a rotary machine, characterized in that a cylinder made of damping material is interposed between a bearing supporting the shaft and the shaft. 3. A bearing device for a rotary machine according to claim 1, wherein a flange is integrally formed on the cylinder. 4. A bearing device for a rotary machine according to claim 1, 2 or 3, wherein the cylinder and the flange are circumferentially separated by at least one separation surface. 5. The bearing device for a rotary machine according to claim 1, wherein an outer flange is integrally formed at one end of the cylinder and an inner flange is integrally formed at the other end.