JP2003042221A - Rotational friction damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational friction damper capable of adjusting a frictional force and absorbing energy in the rotating direction. SOLUTION: This rotational friction damper 1 is provided with an outside member 3, a cylindrical member 2, a tapered pin 4, and a lever 5. The cylindrical member 2 is provided with a tapered internal circumferential surface 2d. The cylindrical member 2 is slidably engaged with the circular hole of the outside member 3 so as to generate the frictional force. A pin 4 is inserted into the tapered internal circumferential surface 2d of the cylindrical member 2 so that, when it is pushed in the direction of an arrow F1, the cylindrical member 2 is enlarged to increase the directional force. When the pin 4 is pushed in the direction of an arrow F2, the frictional force is decreased. In this way, the tapered internal circumferential surface 2d of the cylindrical member 2 is moved by pushing the pin 4 in the arrow F1 or F2 direction so as to adjust the frictional force between the circular hole internal circumferential surface 3a of the outside member 3 and the outer circumferential surface 2a of the cylindrical member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary friction damper slidably engaged so that a frictional force is generated between a circular hole of an outer member and an outer peripheral surface of a cylindrical member, In particular, it relates to a damper installed between the foundation and the structure against earthquakes.

[0002]

2. Description of the Related Art Conventionally, in order to protect a structure from vibration due to an earthquake, it is known to use a seismic isolation member made of laminated rubber in which rubber and iron plates are alternately laminated. In addition, it consists of a housing box consisting of an inner frame and an outer frame that are slidable in the axial direction, and a fitting rod of the outer frame that penetrates the die hole of the inner frame, and the hole diameter of the die is the outer diameter of the fitting rod. Set smaller,
An energy absorbing device for a structural member has been proposed which is capable of absorbing the energy when a tensile force and a compressive repetitive force are applied to the structural member due to an earthquake or the like by connecting to an intermediate portion of the structural member. (For example, JP-A-10
No. 238579).

[0003]

Although a conventional seismic isolation member made of laminated rubber is effective in protecting a building from vibration due to an earthquake, it is said that the building shakes even when wind pressure is applied. The present invention has drawbacks and is proposed in order to solve such a problem, and provides a rotary friction damper which has a seismic isolation function of a structure and which can adjust the friction force in consideration of the influence of wind pressure and the like. Is. Further, the energy absorbing device for a structural member disclosed in Japanese Patent Application Laid-Open No. 10-238579 is connected to an intermediate portion of the structural member to absorb axial energy, and the present invention is directed to a rotational direction in which frictional force can be adjusted. The present invention provides a rotary friction damper that absorbs the energy of.

[0004]

SUMMARY OF THE INVENTION The present invention comprises an outer member having a circular hole therethrough and a cylindrical member having a lever attached to an end engaged with the circular hole of the outer member. Is a rotary friction damper slidably engaged between the inner peripheral surface of the circular hole and the outer peripheral surface of the cylindrical member such that a frictional force is generated, the inner peripheral surface of the cylindrical member being axially The inner peripheral surface of the cylindrical member is tapered, and the tapered pin is inserted into the inner peripheral surface of the cylindrical member to press the cylindrical member in the outer peripheral surface direction from the inner peripheral surface to form the circular hole inner peripheral surface of the outer member and the outer peripheral surface of the cylindrical member. And a frictional force generated between the inner peripheral surface of the circular hole of the outer member and the outer peripheral surface of the cylindrical member by a tapered pin. .

In the rotary friction damper of the present invention, an annular convex step portion is provided at an end portion of the cylindrical member facing the lever mounting portion, and an annular concave step portion is provided at an end portion of the inner peripheral surface of the circular hole of the outer member. Is provided and is engaged with the inner peripheral surfaces of the annular convex step portion of the cylindrical member and the annular concave step portion of the outer member so as not to cause friction. Further, in the rotary friction damper of the present invention, the outer member having the penetrating circular hole and the cylindrical member having the lever attached to the end engaged with the circular hole of the outer member are held by the frame, It is characterized in that it is fixed to the foundation by the constituent bottom plate and the lever is connected to the structure. Further, in the rotary friction damper of the present invention, the lever attached to the end of the cylindrical member engaged with the circular hole of the outer member abuts in the rotation direction of the lever and has a gap in the axial direction of the lever. It is characterized in that they are connected via a connecting member having a hole that has, and the hole provided in the connecting member has a curved surface on the surface that abuts in the rotation direction of the lever. It is characterized by being present.

[0006]

According to the present invention, the cylindrical member is engaged with the circular hole penetrating the outer member so that a frictional force is generated between the circular hole of the outer member and the outer peripheral surface of the cylindrical member. And to absorb the energy in the direction of rotation applied to the cylindrical member. Also, by tapering the axial direction of the inner peripheral surface of the cylindrical member and inserting the tapered pin, the cylindrical member is moved from the outer peripheral surface to the outer peripheral surface. By pressing in the surface direction to adjust the frictional force between the circular hole of the outer member and the outer peripheral surface of the cylindrical member, the frictional force is adjusted and the load at which the rotary friction damper operates is adjusted. In addition, a cylindrical member with a lever attached to the outer member and its end engaged with the circular hole is held by a frame to fix the bottom plate constituting the frame to the foundation, and the lever is connected to the structure to prevent an earthquake. It is useful as a damper that protects the structure from vibrations.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 (a) shows the present invention.
This will be described with reference to (b) and FIG. 1A is a sectional view of the rotary friction damper of the present invention, FIG. 1B is a side view of FIG. 1A, and FIG. 2 is a perspective view of the rotary friction damper of the present invention. As shown in FIGS. 1A and 1B, the rotary friction damper 1 includes an outer member 3, a cylindrical member 2, a tapered pin 4, and a lever 5. The outer member 3 is provided with a circular hole 3a penetrating therethrough. The circular hole 3a points to the inner peripheral surface thereof. The cylindrical member 2 has an outer peripheral surface 2a and an inner peripheral surface 2d that is tapered in the axial direction 2f to 2e. The cylindrical member 2 is engaged with the circular hole of the outer member 3, and is slidably engaged so that a frictional force is generated between the inner peripheral surface 3a of the circular hole of the outer member 3 and the outer peripheral surface 2a of the cylindrical member 2. Has been done.

A tapered pin 4 is inserted into the tapered inner peripheral surface 2d of the cylindrical member 2. Tapered pin 4
Is provided so that it can be moved by pushing with a jack, for example, as indicated by arrows F1 and F2. When the tapered pin 4 is pushed in the direction of the arrow F1, the pin 4 moves along the taper of the inner peripheral surface 2d in the direction of the diameter 2f smaller than the inner peripheral diameter 2e, and the pressure p1 is generated by the pin 4. With this pressure p1, the cylindrical member 2 is expanded and the outer peripheral surface 2a becomes a pressure p2, and friction occurs between the pressure p3 on the inner peripheral surface 3a of the circular hole of the outer member 3 and the pressure p2 on the outer peripheral surface 2a of the cylindrical member 2. Power is generated.

When the tapered pin 4 is pushed in the direction of the arrow F2, it moves along the taper of the inner peripheral surface 2d in the direction of the diameter 2e larger than the inner peripheral diameter 2f, and the pressure p1 of the pin 4 and the pressing of the cylindrical member 2 are applied. The pressure p2 is reduced, and the frictional force between the outer member 3 and the pressure p3 is also reduced. In this way, by moving the tapered pin 4 along the tapered inner peripheral surface 2d of the cylindrical member 2 as indicated by the arrow F1 or F2, the circular hole inner peripheral surface 3a of the outer member 3 and the outer peripheral surface 2a of the cylindrical member 2 are moved. The frictional force with is adjustable.

In this way, the tapered pin 4 inserted into the tapered inner peripheral surface 2d of the cylindrical member 2 is indicated by the arrow F.
1 or by moving as indicated by arrow F2, the pressure p1 on the inner peripheral surface 2d and the pressure p2 on the outer peripheral surface 2a are adjusted, and the friction generated by the pressure p3 on the inner peripheral surface 3a of the circular hole of the outer member 3 is adjusted. The force is adjusted to set the rotational force at which the rotary friction damper 1 operates to a predetermined value. As a result, when the rotational force exceeds the set predetermined value, the rotary friction damper 1 operates,
The inner peripheral surface 3a of the circular hole of the outer member 3 and the outer peripheral surface 2 of the cylindrical member 2
The friction of a absorbs energy. If the rotational force is less than or equal to the set predetermined value, the outer member 3
The inner peripheral surface 3a of the circular hole and the outer peripheral surface 2a of the cylindrical member 2 are fixed by friction.

A lever 5 is attached to the end of the cylindrical member 2. The end portion 2c of the cylindrical member 2 has a quadrangular outer shape, and the quadrangular hole 5b of the mounting portion 5a of the lever 5 is fitted and fixed. In addition, although the end of the cylindrical member 2 and the hole of the lever 5 are shown in a quadrangular shape, the present invention is not limited to this, and a polygonal shape may cause slip between the cylindrical member 2 and the lever 5. It can be fixed so that it does not exist.

An annular convex step 2b is provided at the end of the cylindrical member 2 facing the mounting portion 2c of the lever 5, and an annular concave step is provided at the end of the circular hole inner peripheral surface 3a through which the outer member 3 penetrates. Three
b is provided. The annular concave step portion 3b of the outer member 3 and the cylindrical member 2
The annular convex step portion 2b is engaged. As a result, even if an axial load acts on the cylindrical member 2, the cylindrical member 2 does not come out of the circular hole of the outer member 3. In these members, for example, the outer member having a circular hole penetrating therethrough is made of steel (heat treated steel), and the cylindrical member is made of phosphor bronze.

The outer member 3 engaging the cylindrical member 2 in the circular hole is held by a bottom plate 6, side plates 7, 8 and an upper plate 9 which form a frame. The side plate 7 holds the cylindrical member 2 engaged with the annular concave stepped portion 3b of the outer member 3 at the annular convex stepped portion 2b so as not to slip out in the axial direction. Inner peripheral surface 3a of member 3 and outer peripheral surface 2a of cylindrical member 2
The pin 4 that adjusts the frictional force between and can be pushed in the direction of the arrow F1 by, for example, a jack. Although the hole 7a is shown to be larger than the inner diameter 2e of the cylindrical member 2 in the figure, the hole 7a may be of any size so that the means for pushing the pin 4 in the direction of arrow F1 can be inserted. It is preferable to provide a reinforcing member 11 on the bottom plate 6 and the side plates 7 and 8 that form the frame. Further, the bottom plate 6 is provided with an anchor hole 12 for fixing to the foundation.

The lever 5 fixed to the cylindrical member 2 is
The connecting portion 5c is inserted into the hole of the plate-like connecting member 13. In the hole of the connecting member 13, the connecting portion 5c of the lever abuts on the surface 13b in the rotatable direction of the lever 5 (rotating direction of the cylindrical member 2), and the axial direction of the lever 5 (the cylindrical member 2).
A space 13c is provided in the axial direction) so that the force is not transmitted. The surface 13b of the hole of the connecting member 13 is
This is a surface with which the connecting portion 5c of the lever contacts. When a force exceeding the set value is applied to the rotary friction damper 1 and the lever 5 rotates, the connecting portion 5c of the lever tilts in the hole and slides in the hole. In order to deal with this, even if the connecting portion 5c of the lever is tilted, it can slide in the hole,
Provide a slight gap. The surface of the lever that contacts the connecting portion 5c is a curved surface, for example, a curved surface with an R, so that it can slide easily.

[0015]

Embodiments of the present invention will be described with reference to FIGS. In the embodiment, the rotary friction damper of the present invention is provided between a foundation and a structure and used as a damper against an earthquake. The detailed structure of the rotary friction damper is as described in FIGS. 1 and 2, and the tapered pin 4 inserted into the tapered inner peripheral surface 2d of the cylindrical member 2
The pressure p1 on the inner peripheral surface 2d and the pressure p2 on the outer peripheral surface 2a are adjusted to adjust the frictional force generated by the pressure p3 on the inner peripheral surface 3a of the circular hole of the outer member 3. The rotary friction damper 1 provided in is set to operate when, for example, an earthquake with a seismic intensity of 5 or more occurs. That is, it does not work in an earthquake with a seismic intensity of 4 or less. Also, even if a slight wind pressure is applied to the building, the rotary friction damper will not operate and the building will be set so that it does not shake.

As shown in FIG. 3A, the rotary friction damper 1 is provided between the foundation 20 and the building 15. The rotary friction damper 1 has its bottom plate 6 fixed to a foundation 20 with anchor bolts 21. The lever connecting portion 5c of the rotary friction damper 1 is a curved surface 13 with R of a plate-like connecting member 13.
b, the connecting member 13 is connected to the connecting members 16, 1
It is fixed to the building 15 with 7 and bolts 18.

FIG. 3B shows a state in which the rotary friction damper is activated because the foundation vibrates as indicated by the solid arrow X1 and the chain arrow X2 due to the earthquake and the earthquake exceeds the set value. . When the earthquake vibrates in the direction of the solid arrow X1 and reaches the position of the foundation 20a, the rotary friction damper becomes 1
Although it is in the position of a, the lever 5 is actuated by the action of the rotary friction damper.
Rotates and the building 15 is not subject to vibration in its position. Further, the lever connecting portion 5c is provided with a slight gap so that the lever connecting portion 5c can slide in the hole of the connecting member 13, and the surface of the lever connecting portion 5c with which the lever connecting portion 5c abuts is formed to be a curved surface. Therefore, the lever 5 smoothly maintains the connected state. Also, the base 20 vibrates in the direction of the arrow X2,
At the position of b, the rotary friction damper is at the position of 1b, the lever 5 is rotated to the position of the chain line by the action of the rotary friction damper, and the building 15 is not vibrated at that position.
Thus, even if the foundation vibrates as indicated by the solid arrow X1 and the chain arrow X2 as in an earthquake, the action of the rotary friction damper prevents the vibration of the earthquake from being transmitted to the building 15.

FIG. 4 is a view showing the arrangement of rotary friction dampers as a seismic isolation structure. Rotational friction damper 1 is building 1
In the case of being provided at the four corners of 5, the two rotary friction dampers 1 are provided as a set. The rotary friction damper 1 shown in FIG. 4 is the one described in FIGS. 1 and 2 as viewed from the direction of the connecting member 13, and each rotary friction damper 1 has a structure as shown in FIG. It is provided between the foundation and the building 15. In the rotary friction damper 1, the direction in which the lever 5 can rotate (the rotation direction of the cylindrical member 2) is the same as the connecting member 13.
Since the force is not transmitted with a gap 13c provided in the axial direction of the lever 5 (axial direction of the cylindrical member 2), each rotary friction damper 1 acts on the force in the arrow direction by the action of the rotary friction damper. do. Therefore, by arranging the two rotary friction dampers 1 in combination, the seismic isolation can be achieved in response to the vibration of the earthquake. In addition, although the case where two rotary friction dampers 1 are arranged is illustrated in FIG. 4, by arranging two or more of them in combination, the seismic isolation can be performed corresponding to the vibration in each direction.

Although the case where the rotary friction damper operates due to an earthquake has been described with reference to FIGS. 3 and 4, there are also cases where the rotary friction damper operates due to wind pressure on the building 15. However, in the setting that does not work in earthquakes with seismic intensity 4 or less,
Even if a small amount of wind pressure is applied to the building, the rotary friction damper does not operate and the building does not shake. To prevent When the rotary friction damper operates due to an earthquake and stops at the position indicated by the solid line or the chain line in Fig. 3 (b), the frictional force of the rotary friction damper is returned to the state shown in Fig. 3 (a) with a jack or the like. To prepare for further earthquakes.

[0020]

As described above, according to the rotary friction damper of the present invention, the frictional force is generated between the circular hole of the outer member and the outer peripheral surface of the cylindrical member, so that To absorb energy,
Further, by tapering the inner peripheral surface of the cylindrical member and inserting a pin to press the cylindrical member from the inner peripheral surface toward the outer peripheral surface to adjust the frictional force, the torque in the rotating direction can be adjusted. In addition, the bottom plate of the rotary friction damper of the present invention is fixed to the foundation, and the lever is connected to the structure to exert an excellent effect as a damper that protects the structure from vibration due to an earthquake. .

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment of the present invention.

FIG. 4 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 rotary friction damper 2 Cylindrical member 3 Outer member 4 Tapered pin 5 levers 6-9 frames 13 Connection member

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J048 AA06 AC01 BE13 CB21 DA01                       EA38                 3J066 AA01 AA26 CA02 CA04 CA09                       CB10

Claims (5)

[Claims] 1. An outer member having a circular hole penetrating therethrough, and a cylindrical member having a lever attached to an end engaged with the circular hole of the outer member, the inner peripheral surface of the circular hole of the outer member and a cylinder. A rotary friction damper slidably engaged with an outer peripheral surface of a member so as to generate a frictional force, wherein an inner peripheral surface of the cylindrical member is tapered in an axial direction, and Inserting a tapered pin into the inner peripheral surface of the cylindrical member to pressurize the cylindrical member from the inner peripheral surface toward the outer peripheral surface to generate a frictional force between the inner peripheral surface of the circular hole of the outer member and the outer peripheral surface of the cylindrical member. The rotary friction damper is characterized in that the frictional force between the inner peripheral surface of the circular hole of the outer member and the outer peripheral surface of the cylindrical member can be adjusted by the tapered pin. 2. An annular convex step portion is provided at an end portion of the cylindrical member facing the lever mounting portion, and an annular concave step portion is provided at an end portion of an inner peripheral surface of the circular hole through which the outer member penetrates. The rotary friction damper according to claim 1, wherein the stepped portion and the annular concave stepped portion of the outer member are engaged with each other so as to prevent friction. 3. An outer member having a penetrating circular hole and a cylindrical member having a lever attached to an end of the outer member engaged with the circular hole are held by a frame, and a bottom plate forming the frame is used as a base. The rotary friction damper according to claim 1 or 2, wherein the lever is fixed to the structure and the lever is connected to the structure. 4. A hole attached to an end of a cylindrical member engaged with a circular hole of an outer member, abutting the lever in a rotating direction of the lever and having a gap in an axial direction of the lever. The rotary friction damper according to any one of claims 1 to 3, wherein the rotary friction damper is connected via a connecting member provided with. 5. The rotary friction damper according to claim 4, wherein the hole provided in the connecting member has a curved surface that abuts in the rotation direction of the lever.