JPS5939617B2 - Vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damping device that is interposed between a support body and a supported body, and allows low-speed displacement of the supported body while suppressing high-speed displacement.

Various types of vibration damping devices have been proposed to be installed between supported bodies such as piping and supporting bodies such as structures in chemical plants, power plants, etc., but spring-type ones are It also generates a reaction force against low-speed displacement, and hydraulic types have disadvantages such as poor durability, especially under high radiation conditions.

Additionally, brake-type devices generally have a complicated structure and are expensive.

In addition, with an inertial member fixed to the rotating shaft, if the natural frequency is set high to avoid resonance, the damping force in the low frequency range will be insufficient, and if it is set low, it will increase weight and lack strength. cormorant.

In addition, the patent application No. 53-12272 previously proposed by the present applicant
There is also a device, such as No. 9, in which the generation of resonance is prevented by providing an inertial body rotatable within a predetermined angular range around the axis with respect to a drive member provided on the rotating shaft.

However, in this case, since the inertial body is supported by the rotating shaft, rotational force is applied to the inertial body due to friction with the rotating shaft.
In some cases, it was not possible to provide an appropriate collision in the low frequency vibration range.

The present invention has been made under the above circumstances, and its purpose is to tolerate low-speed displacement without producing a reaction force, and to allow this to occur over a wide frequency range. It is an object of the present invention to provide a vibration damping device that can effectively suppress vibrations, does not cause resonance, has high radiation resistance, and has a simple structure.

Hereinafter, the present invention will be described with reference to illustrated embodiments.

In FIGS. 1 and 2, the main body 1 includes a bottomed cylindrical portion 2 and a lid 3 that closes the open end of the cylindrical portion 2. As shown in FIGS.

A conversion mechanism 4 is attached to the main body 1.

This conversion mechanism 4 includes a first cylindrical body 5 attached to a lid 3, and a second cylindrical body inserted into the first cylindrical body 5 so as to be slidable in the axial direction and not rotate relative to each other. It has a shaped body 6, a nut body 7 such as a ball nut attached to the second cylindrical body 6, and a threaded part 8 that is threadedly engaged with the nut body 7, and is rotatably and relatively attached to the lid body 3. The rotating shaft 9 is supported so as not to be displaced in the axial direction.

A protection tube 10 and one connecting member 11 are attached to the second cylindrical body 6.

The other connecting member 12 is attached to the main body 1.

The conversion mechanism 4 is configured such that when the connecting members 11 and 12 are relatively displaced in the axial direction, the rotating shaft 9 is rotationally driven by the relative displacement of the nut body 7 and the threaded portion 8 in the curved axis direction. .

A driving member 13 is attached to the distal end of the rotating shaft 9 so as to be located inside the main body 1 so as to be able to rotate together with the rotating shaft 9.

The drive member 13 is provided with a plurality of (in the case of three in the figure) protrusions 14 located on the outer periphery and spaced apart in the circumferential direction, and both ends of each of the protrusions 14 in the circumferential direction The impact step portion 15...

16... are provided respectively.

The main body 1 has a bottomed cylindrical portion 2 approximately concentric with the rotating shaft 9.
The support shaft 17 is provided with a support shaft 17 erected on the inner bottom of the 11th. Second inertial members 18 and 19 are each rotatably supported.

The first inertial member 18 has a plurality of (in the case of three in the figure) recesses 20 located on the inner circumference and spaced apart in the circumferential direction.
, and contact step portions 21 . . . , 22 . . . are formed at both ends in the circumferential direction of each recess 20 .

The projection 1 of the driving member 13 is placed in the recess 20...
4... are loosely fitted, and the opposing contact step portions 15.
... and 21... are formed so that the maximum gap in the circumferential direction becomes a predetermined value g1.

Further, the first inertial member 18 has a plurality of (in the case of three projections in the figure) projections 23 located on the outer periphery and spaced apart in the circumferential direction, similar to the drive member 13. , the second inertial member 19 has a recess 24 into which the protrusions 23 loosely fit, almost in the same way as in the first inertial member 18.
..., and contact steps 25..., 26... at both ends in the circumferential direction of the projections 23..., and recesses 24...
Impact step portions 27..., 28 at both ends in the circumferential direction of...
. . . means mutually opposing step portions 25 . . . and 27 .
・The maximum gap in the circumferential direction between .

The device configured as described above has the connection member 11.1
2, one of them is connected to a supporting body such as a column, and the other is connected to a supported body such as piping (both are shown in the figure).

When the nut body 7 and the threaded portion 8 are relatively displaced in the axial direction due to the relative displacement between the support body and the supported body, the drive member 13 is rotated together via the rotating shaft 9.

When the supported body undergoes low-speed displacement due to thermal expansion of piping, etc., the drive member 13 is also driven to rotate at a low speed, so each contact step 15 (or 1) on the same side in the circumferential direction
6...) gently abuts against the inner impact step portion 21... (or 22...) of the first inertial member 18, and the first
The inertia members 18 of are rotated at low speed in the same direction.

As a result, the outer impact step portion 25 of the first inertial member 18...
- (or 26...) quietly abuts against the collision step portion 27... (or 28...) of the second inertial member 19, and the second inertial member 19 also rotates at a low speed in the same direction. be done.

That is, when the supported body makes a low-speed displacement, the first
The moments of inertia of the second inertia members 18, 19 do not exert any reaction force on the drive member 13 to suppress its rotation, and therefore low-speed displacement of the supported body is allowed.

When the supported body makes a high-speed displacement, the impact steps 15 (or 16) of the driving member 13 are the same as the impact steps 21 (or 22) of the first inertial member 18. ), but since the first inertial member 18 does not follow the rotation due to its inertial action, the rotation of the driving member 13 is suppressed, and therefore, the high-speed displacement of the supported body is suppressed via the conversion mechanism 4. .

In addition, when the input is large and the first inertial member 18 alone is insufficient in suppressing force, and the first inertial member 18 is rotated, the impact step portion 25 of the first inertial member 18・・・(
or 26...) and the collision step portion 2 of the second inertial member 19
7... (or 28...) collide with each other, and the restraining force by the second inertial member 19 is transmitted to the drive member 13 via the first inertial member 18.

Therefore, high-speed displacement of the supported body is effectively suppressed.

The above-mentioned operation is performed regardless of the moving direction of the supported body, so even if the supported body vibrates, low-speed vibration is allowed, and high-speed vibration is caused by each impact step. Effectively suppressed by repeated collisions.

According to the above configuration, as described above, it is possible to allow low-speed displacement of the supported body while effectively suppressing high-speed displacement, and furthermore, the first and second inertia members 18 and 19 are connected to the rotation axis. Since the inertial members 18 and 19 are supported on the main body 1 side while being insulated from the rotating shaft 9, rotational force due to friction with the rotating shaft 9 is not applied to the inertial members 18 and 19, and the collision effect between the collision steps is reduced. Excellent suppression effect can be obtained in a high and wide frequency range.

In addition, in the case of high-speed vibration, the vibration energy is absorbed by the collision of each collision step and the frictional resistance between each member, so each rotating part should not have an elastic member etc. that can store rotational energy. Together, the occurrence of resonance is effectively prevented.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, any other conversion mechanism may be provided in place of the conversion mechanism 4 described above.

Further, the second inertial member 19 is connected to the first inertial member 18.
It may be provided integrally with or omitted (see Figures 3 and 4).

Further, the supporting means 30 such as the inertial members 18 and 19 may be provided at both ends of the main body 1 in the axial direction as illustrated in FIG. It may also be provided at any other desired location.

Further, the contact step portion may be provided at the axial end portion.

As described above, the present invention has a driving member attached to the rotating shaft that is rotationally driven in response to the relative displacement between the supporting body and the supported body, and an inertial member that rotates on the main body that supports the rotating shaft. Since the drive member and the inertial member are supported freely and the impact step portions facing each other in the circumferential direction and capable of moving toward and away from each other are provided, low-speed displacement of the supported body is prevented by the impact step portions mutually opposing each other in the circumferential direction. The rotary drive of the inertia member in quiet abutment is tolerated, and high-speed displacements are effectively suppressed by the collision steps colliding with each other to prevent rotation of the drive member.

Since the inertial body is supported on the main body side, there is no accompanying rotation due to friction with the rotating shaft, and appropriate collision can be applied even in the low frequency vibration range.

Further, since the above-mentioned operation is independent of the direction of displacement, the same effect as described above can be achieved with respect to vibration, and since energy is absorbed by collision, resonance etc. do not occur.

Furthermore, since the operating member can be formed from a metal material, its functionality does not deteriorate even under high radiation conditions, and it has excellent durability.

Furthermore, since the driving member is rotatably attached to the rotating shaft and the inertial member is rotatably attached to the main body, the structure is simple and excellent effects can be achieved especially when used for piping.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
A cross-sectional view taken along the line ■-■ in the figure, and FIGS. 3 and 4 are cross-sectional views showing different modifications of essential parts. 1... Main body, 4... Conversion mechanism, 9...
... Rotating shaft, lL12 ... Connection member, 13
・・・・・・Drive member, 14゜23・・・Protrusion,
15, 16, 21. 22, 25. 26.27.28... Impact step section, 17...
...Support shaft, 18.19...Inertia member, 20.
24... Concavity.

Claims (1)

[Claims] 1 A rotating shaft rotatably supported by the main body and rotationally driven in response to relative displacement between the supporting body and the supported body via a conversion mechanism attached to the main body, and a rotary shaft that is rotatably supported by the main body, and A drive member supported for co-rotation; an inertia member supported by the main body for rotation about an axis substantially concentric with the drive member; and a circumferentially opposing impact step.