JP2545028B2 - Bearing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device used, for example, when a rotary shaft of a gas turbine engine is rotatably supported by a housing. More specifically, the setting of the spring constant of the bearing support portion is changed. The present invention relates to a bearing device that absorbs and relaxes the vibration of the rotating shaft.

[0002]

2. Description of the Related Art As a bearing device having this type of vibration absorbing function, conventionally, as shown in FIG. 3, a radial bearing 12 for rotatably supporting a rotary shaft 11 and a cage-shaped bearing as shown in FIG. A cylindrical sleeve that holds a radial bearing 12 that rotatably supports a rotating shaft 11 as shown in FIG. 5, as shown in FIG. No. 15 is supported by the housing 14 via elastic O-rings 16, 16 on both sides of the bearing 12 in the axial direction (see Japanese Utility Model Laid-Open No. 54-10141, etc.), or as shown in FIG. A sealing ring 17 is interposed between a cylindrical sleeve 15 that holds a radial bearing 12 that rotatably supports the rotating shaft 11 and a housing 14 outside the cylindrical sleeve 15. In addition, as shown in FIG. 7 or 8, the sleeve 15 is concentrically supported by the housing 14 by using an elastic support plate 18 made of a leaf spring having a shape having an outward protruding piece 18a. Things (Actual Kai 51-4
No. 5547), and the like are known.

[0003]

Among the conventional bearing devices described above, in the case of the configuration shown in FIGS. 3 and 4, by changing the cage shape of the bearing support 13,
Although the spring constant can be changed over a relatively wide range, use of such a cage-shaped bearing support 13 requires a large space along the axial direction, and the entire bearing device becomes large. In addition to being easy, the shape of the bearing support 13 is complicated and the cost required for its fabrication is high.

In the case of the structure shown in FIG. 5, the space and cost required in the axial direction are small, but the spring constant K of the supporting portion is K = 2k and the elasticity is O, as shown in FIG.
Since the rubber elasticity k of the ring 16 is largely controlled, it is difficult to arbitrarily set the spring constant over a wide range, and in particular, the spring constant cannot be reduced. This means that the cylindrical sleeve in FIG.
The rack 15 is eliminated and the rotary shaft 11 is rotatably supported.
At the position where the outer race of the radial bearing 12 is displaced in the axial direction from the set position of the steel ball of the bearing 12 , one elastic
Ball bearing supported on the housing 14 through an O-ring 16
(See Japanese Utility Model Laid-Open No. 56-162322)
There are similar issues.

Further, in the case of the configuration shown in FIG. 6, the elastic support plate 18 made of a leaf spring having a special shape as shown in FIGS. 7 and 8.
Not only is it necessary to use the spring constant, but the spring constant of the supporting portion is governed by the material and shape of the leaf spring, making it difficult to change the setting of the spring constant over a wide range.

The present invention has been made in view of the above situation, and it is not necessary to use a member having a special shape .
Using a commercially available inexpensive elastic O-ring For example, and while smaller axial space, that over the spring constant in a wide range, to provide a bearing device capable of setting change particularly becomes smaller direction It is an object.

[0007]

To achieve the above object of the Invention The, present invention by that the bearing device includes a sleeve for supporting a bearing for rotatably supporting the rotary shaft, the axis direction of the rotary shaft
Disposed at predetermined intervals to the direction and a plurality of O-rings for elastically supporting the sleeve on the outside of the housing, the rotation of the paired housing supporting position counter sleeve support position and the sleeve of the bearing Displaced in the axial direction of the shaft
It shall be the features a.

[0008]

According to the present invention, the bearing supporting position of the sleeve and the supporting position of the sleeve of the housing are displaced in the axial direction of the rotary shaft , and the plurality of O-rings are attached to the shaft of the rotary shaft.
Are the sleeves arranged at a certain interval in the line direction?
Et al., For example, the principle of leverage with a commercially available rubber O-ring
By, it can uniquely <br/> determined small and any configuration changes the spring constant to be constant depending on the material and size of the O-ring
, And the structure for supporting the bearing can be simplified with a soft soft single inexpensive.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part showing a bearing device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a rotary shaft of a gas turbine engine, and 2 is a radial bearing for rotatably supporting the rotary shaft 1. It is a bearing. Reference numeral 3 is a cylindrical sleeve, and the radial bearing 2 is provided on one end side in the axial direction of the sleeve.
The outer race 2a is fitted to support the bearing 2, and two ring grooves 3a, 3a are formed on the outer peripheral surface on the other end side in the axial direction at appropriate intervals in the axial direction. ing.

4, 4 are ring grooves 3a of the sleeve 3,
An O-ring as a ring-shaped elastic support member fitted in 3a. By elastically contacting the O-rings 4 and 4 with the inner peripheral surface of the housing 5, the sleeve 3 is elastically supported by the housing 5. With the above configuration, the supporting position of the bearing 2 with respect to the sleeve 3 and the housing 5 of the sleeve 3
And the supporting position with respect to are displaced in the axial direction of the rotating shaft 1.

In the bearing device having the above-described structure, the spring constant K of the bearing supporting portion is, as shown in FIG. 2, the axial direction between the supporting position of the bearing 2 with respect to the sleeve 3 and the supporting position of the sleeve 3 with respect to the housing 5. Distance is Lb, two O
The axial distance between the rings 4 and 4 is Lo, and each O ring 4 is
When the spring coefficient of 4 is k, K = k · Lo ² / {Lb ² + (Lo + Lb) ² }, and a large amount of change of the bearing support part with respect to the load F can be obtained by the principle of leverage. Also, here, Lb and Lo
By changing, the spring constant K can be adjusted arbitrarily.

[0012]

As described above, according to the present invention, by displacing the bearing supporting position of the sleeve and the supporting position of the sleeve of the housing in the axial direction of the rotary shaft, the bearing is utilized by utilizing the principle of leverage. Since the spring constant of the support part can be lowered, and the set value of the spring constant can be adjusted by changing the displacement amount in the axial direction,
Or use a special shape such as a cage shape as a sleeve, it is not necessary to use a specially shaped made plate spring as an elastic support member, for example, using an elastic O-ring, which is commercially available, the structure Is simple and cheap, and the required space in the axial direction is also small to make the whole compact,
The spring constant can be arbitrarily set over a wide range to improve the vibration absorbing performance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a bearing device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a spring constant in the bearing device.

FIG. 3 is a vertical cross-sectional view of a main part showing an example of a conventional bearing device.

FIG. 4 is a perspective view of a main part of FIG.

FIG. 5 is a vertical cross-sectional view of a main part showing another example of a conventional bearing device.

FIG. 6 is a vertical cross-sectional view of a main part showing another example of a conventional bearing device.

7 is an enlarged perspective view of a main part showing one of the parts in the bearing device of FIG.

8 is an enlarged perspective view of a main part showing another part of the bearing device of FIG.

9 is a schematic diagram for explaining a spring constant in the bearing device of FIG.

[Explanation of symbols]

1 rotating shaft 2 bearing 3 sleeve 4 O-ring 5 housing

Claims (1)

(57) [Claims] 1. A sleeve that supports a bearing that rotatably supports a rotating shaft, and a predetermined space in the axial direction of the rotating shaft.
And it is disposed and a plurality of O-rings for elastically supporting the sleeve on the outside of the housing, displacement and a counter housing supporting position counter sleeve support position and the sleeve of the bearing in the axial direction of the rotary shaft bearing device is characterized in that is.