JPH0518491Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vibration-isolating structure for a bearing, and particularly to a vibration-isolating structure for a bearing that utilizes a member that generates internal frictional force.

[Prior Art] It is known that a bearing that supports a rotating shaft is generally provided with an anti-vibration structure for preventing vibration of the rotating shaft.

Conventionally, a so-called squeeze film damper has often been used to prevent vibrations of the rotating shaft. The vibration isolation structure of the bearing using this squeeze film damper was constructed as shown in FIG.

As shown in the figure, a rotating shaft b of a rotating device a is supported by a bearing c such as a rolling bearing. A bearing mount d is provided on the outer periphery of the bearing c, and this bearing mount d is elastically supported by a spring element f from a housing e of the rotating device a. A gap g between the housing e and the bearing mount d supported by the spring element f is filled with oil h as a squeeze film damper.

The vibration isolation structure of the conventional bearing constructed in this way prevents the relative displacement between the housing e and the bearing mount d due to the vibration of the rotating shaft b by using oil filled in the gap g between the housing e and the bearing mount d. The vibration of the rotating shaft b was damped by absorbing it by the squeezing effect of h.

[Problems to be solved by the invention] By the way, the following problems have occurred with the conventional vibration-proof structure of a bearing.

Housing e of rotating equipment a and bearing mount d
The gap g between is filled with oil h, and the squeezing effect of this oil h dampens the vibration of the rotating shaft b, so oil h cannot be used in gas atmospheres, low temperatures, high temperatures, vacuum atmospheres, etc. There was a problem that this squeeze film damper method was not suitable under certain environmental conditions.

In view of the above-mentioned problems, the present invention has developed a vibration-proof structure for a bearing that has a simple structure, can damp the vibrations of the rotating shaft even in environments where oil cannot be used, and can also adjust the damping force. The purpose is to provide

[Means for Solving the Problem] In order to solve the problem in the vibration isolation structure of a bearing, the present invention fits a bearing mount to a bearing that supports a rotating shaft of a rotating device, and the bearing mount is attached to a bearing that supports a rotating shaft of a rotating device. In a vibration isolation structure for a bearing, the bearing mount is housed in an annular groove formed in a housing and is supported within the annular groove so as to be movable in the radial and axial directions via a spring element. A damper member made of a knitted wire plate is provided between the grooves to absorb external force through internal friction.

[Operation] The bearing mount configured as described above and fitted with a bearing is movably supported in the annular groove by a spring element in the radial and axial directions, and vibrates in response to vibrations transmitted from the rotating shaft. .

At this time, the damper member provided between the annular groove and the bearing mount can damp the vibration of the bearing mount by the frictional force caused by the shearing of the knitted wire plate. In this way, vibrations can be effectively damped by appropriately selecting the support rigidity of the spring element and the damping force of the damper member.

[Example] An example of the anti-vibration structure for a bearing according to the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a rotating shaft 2 of a rotating device 1 is supported by a bearing 3 such as a rolling bearing. A bearing mount 4 for supporting the bearing 3 is provided on the outer circumference of the bearing 3. These bearings 3 and bearing mounts 4 are accommodated in an annular groove 13 formed in a housing 5 of the rotating device 1. This bearing mount 4 is elastically supported by spring elements 6 from both end faces 14 of the annular groove 13.
In this embodiment, the spring element 6 is formed by a pin member 7 that passes through the bearing mount 4 and is hung between both end surfaces 14 of the annular groove 13 along the axial direction of the rotating shaft 2. , supports the bearing mount 4 movably in the radial and axial directions, and transmits vibrations transmitted from the rotating shaft 2 via the bearing 3 to the bearing mount 4. Between the annular groove 13 and the bearing mount 4, there is internal friction that damps the vibration of the rotating shaft 2 by absorbing the relative displacement between the housing 5 and the bearing mount 4 caused by the vibration of the rotating shaft 2 using internal frictional force. Damper members 8a and 8b are provided. That is, the annular groove 1 in the radial direction of the rotating shaft 2
A damper member 8a is provided in the gap 9 between the rotary shaft 2 and the bearing mount 4, and a damper member 8a is provided in the gap 9 between the annular groove 13 and the bearing mount 4 in the axial direction of the rotating shaft 2.
1 is provided with a damper member 8b.

The internal friction damper members 8a, 8b are made of a member that generates internal friction, such as a knitted wire plate 12, for example. This knitted wire plate 12 is approximately
It is formed by weaving wires with a diameter of 0.2 to 0.5 mm into multiple layers. In this embodiment, the knitted wire plate 12
However, the present invention is not limited to this, as long as it is a member that generates an internal frictional force in response to an external force.

Next, the operation of one embodiment of the bearing vibration isolation structure constructed as described above will be described.

When the rotating shaft 2 of the rotating device 1 rotates, vibrations and self-excited vibrations occur due to the unbalance of the rotating body. This vibration is transmitted to the bearing 3 that supports the rotating shaft 2. This bearing 3 is supported by a bearing mount 4 which is elastically supported within the annular groove 13 by the spring element 6 mentioned above. Therefore, the bearing mount 4 supports the bearing 3 with the support rigidity of the spring element 6 made of a pin, and vibrates in response to the vibration of the rotating shaft 2.

This causes a relative displacement between the bearing mount 4 and the annular groove 13 of the housing 5.
Due to this relative displacement, the internal friction damper member 8 provided between the annular groove 13 and the bearing mount 4
An external force is applied to the knitted wire plates 12, which are a and 8b. The knitted wire plate 12 subjected to this external force generates a frictional force due to shearing inside, and this internal frictional force absorbs the external force and damps the vibration of the rotating shaft 2. Moreover, in this embodiment, gaps 9, 10 between the housing 5 and the bearing mount 4 in the radial and axial directions of the rotating shaft 2,
Since the knitted wire plate 12 is sandwiched between the parts 11 and 11, vibrations in all directions can be damped.

In this way, the housing 5 and the bearing mount 4
Knitted wire plate 1 is placed in the gaps 9, 10, 11 between
By sandwiching and providing internal friction damper members 8a and 8b such as 2, vibration damping force can be obtained even in environments where oil cannot be used, such as gas atmosphere, low temperature, high temperature, vacuum atmosphere, etc. .

[Effects of the Invention] The present invention as outlined above provides the following excellent effects.

(1) By housing the bearing mount in the annular groove and supporting it with a spring element, the bearing mount receives the vibration of the rotating shaft, and the vibration of the bearing mount is damped by the damper member provided between the bearing mount and the annular groove. By doing so, vibration of the rotating shaft can be efficiently prevented without using oil.

(2) Vibration damping can be obtained even in environments where oil cannot be used, and the structure is simple, making it highly versatile.

(3) The supporting rigidity of the spring element and the knitted wire plate forming the internal friction damper member make it possible to obtain a damping force that corresponds to the vibration, making it possible to adjust the vibration damping force.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the vibration isolation structure for a bearing according to the present invention, and FIG. 2 is a side sectional view showing a conventional example. In the figure, 1 is a rotating device, 2 is a rotating shaft, 3 is a bearing,
4 is a bearing mount, 5 is a housing, 6 is a spring element, 8a, 8b are internal friction damper members, 12 is a knitted wire plate, and 13 is an annular groove.

Claims (1)

[Scope of utility model registration request] A bearing mount is fitted to a bearing that supports a rotating shaft of a rotating device, and the bearing mount is housed in an annular groove formed in a housing of the rotating device, and a spring element is attached to the bearing mount in the annular groove. In the vibration isolation structure for a bearing supported movably in the radial and axial directions through the bearing, a damper member made of a knitted wire plate is provided between the bearing mount and the annular groove, and absorbs external force by internal friction. Anti-vibration structure for bearings.