JP2003097636A - Friction damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction damper of the structure that can easily adjust damping force large and small. SOLUTION: Long holes 15, 16 are provided to the 1st link 1 and the 2nd link 2 respectively, and a bolt 6 passes through these long holes 15, 16. The 1st link and the 2nd link are connected and combined by tightening this bolt 6 so as to push those frictional faces. In the condition where the bolt 6 is loosened, the bolt 6 can move along the long holes 15, 16 and adjust the interval dimension between combined part of this bolt and another combined part large and small.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a friction damper.

[0002]

2. Description of the Related Art As a damping device used in combination with a seismic isolation device for a building, a first link and a second link are pivotally connected so as to press their friction surfaces against each other. There is a so-called rotary friction damper in which vibration is damped by sliding friction resistance between friction surfaces when the link is relatively rotationally displaced about this pivotal portion.

[0003]

In this friction damper, the damping force can be adjusted in magnitude by changing the area of the frictionally sliding surface or the friction coefficient of the friction surface, but this is very troublesome. .

In view of such problems, it is an object of the present invention to provide a friction damper having a structure capable of easily adjusting the damping force.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned problems, a first link and a second link are pivotally connected so as to press their friction surfaces against each other, and these first and second links are connected to each other by this pivot portion. A friction damper adapted to damp vibrations by sliding frictional resistance between the frictional surfaces when they are relatively rotationally displaced with respect to each other, wherein the first link and / or the second link is different from the pivotal portion. This is solved by a friction damper characterized in that the size of the distance from one pivot portion can be adjusted.

In this friction damper, the size of the distance between the pivotal portion having the friction surface and the other pivotal portion can be adjusted to a large or small value. Can be changed from large to small,
The damping force can be adjusted accordingly.

Moreover, since the link itself can adjust the above-mentioned interval size, the link provided can be used as it is without replacing the link with another link having a different length. It is possible to adjust the size of the above-mentioned interval, and it is possible to easily adjust the damping force.

Further, the above-mentioned problem is that the first link and the second link are pivotally connected so that their friction surfaces are pressed against each other by the tightening force of the bolt, and these first and second links are connected to this bolt shaft. The vibration is damped by the sliding frictional resistance between the frictional surfaces when they are relatively rotationally displaced about each other. The frictional surface of the first link is formed by the first frictional sliding ring, and the second frictional ring is formed. The friction surface of the link is formed by a second friction sliding ring, and the first and second friction sliding rings are placed in a superposed state to surround the bolt between the first link and the second link. Installed in
Both friction sliding rings are sandwiched between both links by tightening the bolts, so that the friction force between each link and each friction sliding ring in this bolt tightened state becomes larger than the friction force between the friction sliding rings. Therefore, the first link and the first friction sliding ring, and the second link and the second friction sliding ring, respectively, move integrally during relative rotational displacement of the first and second links. Then, the friction sliding rings are frictionally slid with each other, and the through holes for the bolts provided in the first link and / or the second link are provided along the length direction of the link. The bolts can be tightened at any position along the slot, or the bolts can be spaced apart along the length of the link. The bolt consists of a simple bolt through hole It is possible to perform tightening even with the simple through holes that are offset, so that it is possible to adjust the size of the distance between this bolt pivoting part and another pivoting part. It is solved by the friction damper.

In this friction damper, the first link and the second link are provided.
By moving the bolt for pivoting the friction surfaces of the links against each other along the long hole of the link or by selecting one of the other simple bolt through holes, It is possible to adjust the size of the interval between the attachment portion and the other pivotal attachment portion, and to change the rotational moment to adjust the damping force. There is no need to replace the link with another link having a different length, and the provided link can be used as it is to adjust the above-mentioned interval size.

Moreover, by tightening the bolts, the above-mentioned distance can be fixed, and the friction surfaces of the first link and the second link can be pressed against each other. A dynamic ring can be integrated with each link, and these can be accomplished at once with only one act of tightening the bolt.

In addition, in this friction damper, the first and
Since the friction surfaces of the second link are pressed against each other, the friction surfaces can be pressed against each other with a strong force, so that the area of the friction surface can be reduced, and the vibration can be effectively reduced by the high friction force. Can be attenuated. Since the frictional force is exerted by pressing the friction surfaces against each other by tightening the bolts, the bolts can be used together as the fixing means for the above-mentioned interval dimension.

Further, the friction surface of the first link is formed by the first friction slide ring, and the friction surface of the second link is formed by the second friction surface.
The first and second friction sliding rings are formed by friction sliding rings, and the first and second friction sliding rings are placed around each other between the first link and the second link in a superposed state, and tightened by the bolts. Both friction sliding rings are sandwiched between both links with the setting that the friction force between each link and each friction sliding ring in this bolt tightened state is set to be larger than the friction force between the friction sliding rings. Therefore, during vibration, friction sliding rings precede each other by friction sliding, which prevents friction sliding between the link and friction sliding ring. The state can be maintained firmly without breaking.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

In the rotary friction damper 5 of the embodiment shown in FIG. 1 (a), the first, second, third and fourth links 1, 2, 3 and 4 are assembled in a square shape when seen in a plane. , A pantograph type in which those ends are pivotally connected so as to be rotationally displaceable.

Each of the links 1, 2, 3, 4 is made of a plate such as a steel plate, and the first link 1 and the second link 2 are pivotally connected to each other so as to be capable of relative rotational displacement. ing.

That is, as shown in FIG. 1B, two first links 1 and three second links 2 are prepared, and their end portions make the second link 2 the outermost side. In this way, they are alternately arranged in the vertical direction, and are tightened by bolts 6 and nuts 7 to be pivotally connected. By tightening the bolt 6, the friction surface of the first link 1 and the friction surface of the second link 2 are pressed against each other, and the first and second links 1 and 2 are attached to the bolt 6
The vibration is damped by the sliding frictional resistance between the frictional surfaces during relative rotational displacement around the axis. Since the same links 2 and 2 are overlapped on the outermost side, the bolt 6 does not loosen even if the first link 1 and the second link 2 are relatively rotationally displaced. The nut 7 may be a double nut.

In this embodiment, the first and second links 1,
Each friction surface 2 is formed by using first and second friction sliding rings 8 and 9, as shown in FIGS. That is, these two friction sliding rings 8 and 9 are vertically stacked and are arranged between the first link 1 and the second link 2, and the bolts 6 are attached to the friction sliding rings 8 and 9.
, And the bolt 6 is tightened and sandwiched between the first link 1 and the second link 2 in a pinched state.

In this sandwiched state, the frictional force between the first link 1 and the first frictional sliding ring 8 is set to be larger than the frictional force between the frictional sliding rings 8 and 9. The second link 2 and the second friction sliding ring 9
The frictional force between and is also set to be larger than the frictional force between the friction sliding rings 8 and 9, whereby the first
Link 1, first friction slide ring 8 and second link 2
The second friction sliding ring 9 and the second friction sliding ring 9 integrally move during relative rotational displacement of the first and second links 1 and 2, so that the friction sliding rings 8 and 9 frictionally slide with each other. ing.

That is, the friction sliding rings 8 and 9 which are separate from the links 1 and 2 are integrated with the links 1 and 2 only by tightening the bolts 6, and the friction surfaces of the links 1 and 2 are integrated. Are formed. The first and second friction sliding rings 8 and 9 may be composed of the same parts, in which case the types of parts can be reduced.

The inner diameter of each of the first and second friction sliding rings 8 and 9 is set to be larger than the outer diameter of the rod portion of the bolt 6, and the friction sliding in the bolt tightened state. The rings 8 and 9 are adapted to frictionally slide in a region spaced from the bolt 6 radially outward.

A spacer ring 10 is used to maintain this distance. This spacer ring 10
Has an inner diameter dimension that fits snugly into the outer circumference of the rod portion of the bolt 6, and an outer diameter dimension that fits snugly into the inner circumference portions of the friction slide rings 8 and 9. The thickness dimension thereof is designed to be smaller than the total thickness dimension of the upper and lower friction sliding rings 8 and 9 and larger than the thickness dimension of either of the friction sliding rings 8 and 9. This spacer ring 10 is provided between the first and second links 1 and 2,
It is arranged between the rod portion of the bolt 6 and the friction slide rings 8 and 9, and the friction slide rings 8 and 9 are the spacer rings 10.
The bolt 6 is tightened with a predetermined distance from the rod portion of the bolt 6 to the outside of the radial line.

For assembly, as shown in FIG. 4, the friction slide rings 8 and 9 are fitted on the outer peripheral side of the spacer ring 10, these are arranged between the links 1 and 2, and the bolt 6 is attached to the links 1 and 1.
It suffices to just pass it through 2 and the spacer ring 10 and tighten.

Such a pivot joint structure has end pivot joints between the third link 3 and the fourth link 4, end joint pivots between the second link 2 and the third link 3, and the first link. 1 and 4th link 4
It has been adopted in the end pivot joint.

At the end joints of the second link 2 and the third link 3, as shown in FIG. 1, a pair of bearing plates 13 and 13 project from the substructure 11 of the building such as a foundation, and the bearing plates 13 and 13 are projected. The ends of the second link 2 and the third link 3 are sandwiched between the plates 13 and 13, and the whole is fastened with a bolt 6, and a pair of friction sliding rings 8 is also provided between the bearing plate 13 and the second link 2. , 9 and spacer ring 10
Is included. Also, the first link 1 and the fourth link 4
In the end pivotal part of, the pair of bearing plates 14, 14 project from the superstructure 12 of the building, and the bearing plates 14, 14 sandwich the ends of the first link 1 and the fourth link 4, The whole is tightened with bolts 6, and a pair of friction slide rings 8 and 9 and a spacer ring 10 are also inserted between the bearing plate 14 and the fourth link 4.
As a result, the lower structural part 11 and the upper structural part 12 of the building are connected by the friction damper 5.

In this friction damper 5, when the seismic isolation device (not shown) provided in the building vibrates in the horizontal direction as shown in FIG. 5A, the first, second, and
The third and fourth links 1, 2, 3 and 4 are bolts 6 of the connecting portion.
Relative rotation displacement is performed around the axis, and the vibration is damped by the frictional sliding resistance of the friction surface at each pivotal portion at that time. As shown in FIG. 5B, by installing the friction damper 5 so as to work in two horizontal directions, it is possible to effectively damp any horizontal vibration.

Then, in the above friction damper 5,
As shown in FIGS. 1A and 2, the first link 1 and the second link 1
The bolt through holes 15 and 16 formed in the links 1 and 2 for pivotal connection with the link 2 are both long holes extending in the longitudinal direction of the links 1 and 2. A bolt 6 is passed through the elongated holes 15 and 16 and tightened. Similarly, for the through holes 17 and 18 formed in the links 3 and 4 for pivotally connecting the third link 3 and the fourth link 4 with the bolts 6, the length directions of the links 3 and 4 are the same. The long holes 17 and 18 are fastened by bolts 6.

As a result, at the stage before tightening each bolt 6, the position of the bolts 6, 6 in the longitudinal direction within the elongated holes 15, 16, 17, 18 is arbitrarily selected, so that the bolts are pivotally attached by the bolts. Portion and another bolt pivotal attachment portion of each link 1, 2, 3, 4 (in the present embodiment, this other bolt pivotal attachment portion is also provided with a friction surface by a friction slide ring). The size of the space between and can be adjusted steplessly. FIG. 2 (a) shows the case where the gap size is increased, FIG. 2 (b) shows the case where the gap size is reduced, and FIG. 1 (a) shows the gap size. This is for a medium size.

In the above friction damper 5, the links 1,
By using the long holes 15, 16, 17, 18 provided in 2, 3, 4 so that the size of the space between the bolt pivot parts in each link 1, 2, 3, 4 can be adjusted. Therefore, the rotational moment of each of the links 1, 2, 3, 4 can be changed in magnitude by adjusting the size of the space, and the damping force can be adjusted in magnitude.

That is, in the case of FIG. 2A in which the interval dimension between the bolt pivot portions in each of the links 1, 2, 3, 4 is increased, the rotational moment is increased and a small damping force is obtained. Further, in the case of FIG. 2B in which the interval dimension is reduced, the rotation moment is reduced and a large damping force is obtained. In addition, the space size is set to an intermediate size in FIG.
In the case of (a), the rotational moment has an intermediate magnitude, and an intermediate damping force is obtained.

Moreover, the same links 1, 2, 3, 4 originally provided are used, and the long holes 15, 16, 17, 18 are used.
Is used to select the tightening position of the bolt 6 along the long hole so that the above-mentioned interval size can be made larger or smaller. To make the interval size different, the links 1, 2,
Since the links 3 and 4 are not replaced with other links, the damping force can be easily adjusted.

In addition, by tightening the bolts 6 and 6 passed through the elongated holes 15, 16, 17 and 18, the above-mentioned distance dimension can be fixed and the friction surfaces of the first link 1 and the second link 2 can be fixed. Each other, the third link 3 and the fourth link 4
The friction surfaces can be pressed against each other, and at the same time, the friction slide rings 8 and 9 for forming these friction surfaces can be integrated with the links 1, 2, 3, and 4. Therefore, it is possible to achieve these at once by performing only one act of tightening the bolts 6 and 6.

Particularly, in the friction damper 5 of this embodiment,
The friction surfaces of the first link 1 and the second link 2 are not caused by the spring force of the spring but by the tightening force of the bolt 6, and
Since the friction surfaces of the third link 3 and the fourth link 4 are pressed against each other, the friction surfaces can be pressed against each other with a strong force, so that the area of the friction surface can be reduced, and yet the vibration is generated. Can be effectively damped by high friction force. And such a bolt 6
Since the frictional force is exerted by pressing the friction surfaces against each other by tightening, the bolts 6 and 6 can be used together as a fixing means of the above-mentioned interval dimension.

Further, the frictional force between the links 1, 2, 3 and 4 and the frictional sliding rings 8 and 9 when the bolts 6 and 6 are tightened is larger than the frictional force between the frictional sliding rings 8 and 9. Since it is set to be large, the friction sliding rings precede each other by friction during the vibration, and therefore the links 1, 2, 3, 4 and the friction sliding rings 8, 9 do not contact each other. It is possible to firmly maintain the fixed state of the above-mentioned distance dimension without causing frictional sliding intentionally.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where a hole closed in a loop shape is adopted as the long hole provided in the link is shown, but a hole opened in a non-loop shape, for example, the tip of the link is bifurcated. It may be a long hole that is opened.

Further, the elongated holes 1 are formed in the links 1, 2, 3 and 4 as means for adjusting the distance between the pivot parts of the links.
5, 16, 17 and 18 are shown, but a plurality of simple bolt through holes which are not long holes such as round holes are provided in each of the links 1, 2, 3 and 4 in the length direction thereof. It may be possible to adjust the size of the space between the pivot parts by opening at intervals, selecting one of the through holes, and inserting a bolt through the selected through hole, or The lengths of the links 1, 2, 3, 4 can be adjusted to be short or long, and by adjusting the length, the size of the space between the pivot parts can be adjusted. May be. When the lengths of the links 1, 2, 3, 4 can be adjusted to be short or long, for example, the pressing of the friction surfaces at the pivotal portion should not be caused by the tightening force of the bolt, but by the spring of the spring. The structure may be such that it is performed by force.

In the above embodiment, the first link 1
The second link 2 and the third link 3 and the fourth link 4 are both provided with the long holes 15, 16, 17, and 18, but the first link 1 And the second link 2, or the third link 3 and the fourth link
The structure may be such that one of the links 4 is provided with an elongated hole, one of the first link 1 and the second link 2, or one of the third link 3 and the fourth link 4. The structure may be such that one side is provided with a long hole.

Further, in the above embodiment, the case where the four links 1, 2, 3 and 4 are configured as a pantograph type friction damper which is formed into a square when viewed in a plane is shown. It may be configured as a friction damper which is assembled by connecting in a dogleg shape.

Further, in the above embodiment, the friction surface is formed by using the friction sliding ring, and the friction sliding ring is arranged by the spacer ring in the radial direction from the bolt rod portion. However, even if the spacer ring is omitted and the inner circumference of the friction sliding ring is fitted to the outer circumference of the bolt rod, there is no gap between the friction sliding ring and the bolt rod. Good.

Furthermore, in the above embodiment, the friction damper used in combination with the seismic isolation device used in the building is targeted, but the friction damper of the present invention is
It can be used not only for damping the vibration of a building but also for damping the vibration of various structures, and is not premised on a combination with a seismic isolation device. Further, in the above-described embodiment, the case where the link is rotationally displaced in the horizontal plane with the bolt axis oriented vertically is shown, but the configuration may be such that the bolt axis is oriented horizontally and the link is rotationally displaced in the vertical plane. However, there is no limit to the orientation.

[0040]

Since the friction damper of the present invention is as described above, it is possible to easily adjust the damping force. Further, according to the friction damper of the present invention, it is possible to adjust the maximum allowable stroke of the damper according to the amplitude of the vibration to be damped.

[Brief description of drawings]

FIG. 1A is a plan view showing a friction damper according to an embodiment, and FIG. 1B is a side view of the same section.

2A and 2B show an example of adjustment of a space dimension between pivot joints in a link, FIG. 2A is a plan view when the space dimension is increased, and FIG. 2B is a plan view when the space dimension is reduced.

FIG. 3 is an enlarged view of the pivotal portion of the link. FIG. 3 (a) is a side view, FIG. 3 (b) is a sectional side view, FIG. 3 (c) is a sectional plan view, and FIG. FIG.

FIG. 4 is an exploded sectional side view of a pivotal portion.

FIG. 5A is a plan view showing the movement of the friction damper during vibration, and FIG. 5B is a plan view showing an installation example.

[Explanation of symbols] 1 ... 1st link 2 ... second link 5 ... Friction damper 6 ... bolt 8 ... 1st friction sliding ring 9 ... Second friction sliding ring 15, 16 ... long hole

Continued front page    (72) Inventor Takashi Inoue             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute (72) Inventor Hitoshi Yamashita             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute F term (reference) 3J048 AA04 AC01 AD12 BG06 CB21                       DA04 EA38

Claims (2)

[Claims] 1. A first link and a second link are pivotally connected so as to press their friction surfaces against each other.
A second damper is a friction damper configured to damp vibrations by sliding frictional resistance between the friction surfaces when the second link is relatively rotationally displaced about the pivotal portion, and the first link and / or the second link A friction damper characterized in that a link can adjust a size of a space between the pivotal portion and another pivotal portion. 2. A first link and a second link are pivotally connected so as to press their friction surfaces against each other by a tightening force of a bolt, and these first and second links rotate relative to each other about the bolt shaft. Vibration is damped by the sliding frictional resistance between the frictional surfaces when they are displaced, and the frictional surface of the first link is formed by the first frictional sliding ring, and the frictional surface of the second link is A second friction sliding ring is formed, and these first and second friction sliding rings are placed in a superposed state and installed around the bolt between the first link and the second link. Both friction sliding rings are sandwiched between both links by tightening, so that the friction force between each link and each friction sliding ring in this bolt tightened state becomes larger than the friction force between the friction sliding rings. Is set As a result, the first link and the first friction sliding ring, and the second link and the second friction sliding ring, respectively, move integrally during relative rotational displacement of the first and second links, resulting in friction. The sliding rings are adapted to frictionally slide with each other, and the through hole for the bolt provided in the first link and / or the second link is extended along the length direction of the link. Or the bolt can be tightened at any position along the slot, or
The bolt consists of a plurality of simple bolt through holes spaced at intervals along the length of the link so that the bolt can be tightened in any of the simple through holes. The friction damper is characterized in that the size of the space between it and another pivot portion can be adjusted.