JP2012154356A - Friction damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction damper capable of exerting sufficient damping performance against vibration energy, even if the excessive vibration energy exceeding vibration energy absorbing capability related to a damping device acts to a building construction, in a seismic isolation structure including the damping device.SOLUTION: The friction damper includes a shaft formed with a guide groove along the axial direction on the surface, a moving member which moves along the axial direction on the surface of the shaft, and is set in either of a first state of being immersed in the guide groove of the shaft and a second state of being removed from the guide groove, a crimping member to be urged toward the moving member and locked with the moving member set in the first state, and a friction member to be in press-contact with the shaft selectively, wherein if the moving member is set in the second state, locking of the crimping member by the moving member is released, the friction member is brought into press-contact with the shaft by pressing of the crimping member, and the crimping member maintains the moving member in the second state.

Description

  The present invention relates to a friction damper that is disposed between two structures and attenuates vibration energy transmitted from one structure as a vibration source to the other structure.

  2. Description of the Related Art In recent years, as a seismic isolation structure for a building structure, a structure that is provided between a building structure and its building base and insulates the building structure from shaking of the building base is known. According to this type of seismic isolation structure, even if vibration energy from an earthquake or the like propagates to a building structure, the building structure can swing with its own vibration period regardless of the vibration period of the building base. It has become.

  However, in the case of the seismic isolation structure, since the building structure is insulated from the shaking of the building foundation, the shaking of the building structure remains even after the earthquake has stopped. In order to terminate the remaining shaking of the building structure at an early stage, an example in which a damping device that absorbs vibration energy of the building structure is used as a component of the seismic isolation structure is given.

  The damping device absorbs vibration energy, but on the other hand, it also exhibits the function of causing the building structure to follow the building base. Therefore, the damping device absorbs vibration energy in the case of a huge earthquake. When set high, the shaking of the building base easily propagates to the building structure, and the original function of the seismic isolation structure that insulates the building structure from the shaking of the building base becomes difficult. Considering this point, in order to make use of the function of the seismic isolation structure, the absorption capacity of the attenuation device cannot be set extremely high. I have to decide my ability. However, when a large earthquake occurs with the absorption capacity of the damping device set in this way, the vibration energy of the earthquake cannot be sufficiently absorbed by the damping device, and as a result, the building structure against the building foundation cannot be absorbed. The amplitude of shaking will increase. Moreover, since the damping device cannot sufficiently absorb the vibration energy, the shaking of the building structure cannot be terminated at an early stage.

  As means for solving such a problem, an example in which the brake device disclosed in Patent Document 1 is used together with the seismic isolation structure is given. This brake device is disposed between a building structure and its building base, and is roughly composed of a frame fixed to the building structure and a convex portion provided on the building base. In this brake device, when excessive vibration energy exceeding the vibration energy absorption capability of the damping device acts on the building structure and the building structure vibrates greatly in the horizontal direction, the frame body is provided on the building base. A frictional force is generated between the frame and the convex portion by riding on the convex portion (Patent Document 1).

JP 2000-179617 A

  However, in the seismic isolation structure to which the brake device disclosed in Patent Document 1 is applied, when excessive vibration energy due to an unexpected large earthquake acts, any of the pair of protrusions provided on the building base is the frame. Since the brake device acts when riding on one of them, the swing width of the building structure can be suppressed within a certain range. On the other hand, since the brake device disclosed in Patent Document 1 does not act between the pair of convex portions, it is not possible to end the shaking of the building structure after the end of the earthquake at an early stage.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a base-isolated structure including a damping device, in which excessive vibration energy exceeding the vibration energy absorption capability of the damping device is a building structure. An object of the present invention is to provide a friction damper capable of exhibiting sufficient damping performance against vibration energy even when acting on an object.

  The friction damper of the present invention that achieves such an object includes a shaft having a guide groove formed along the axial direction on the surface, and moves along the axial direction of the shaft along the shaft direction so as to be immersed in the guide groove of the shaft. The moving member set to either the first state or the second state separated from the guide groove, and biased toward the moving member and locked by the moving member set to the first state A crimping member and a friction member that is selectively pressed against the shaft. When the moving member is set to the second state, the crimping member is unlocked by the moving member, and the friction member The pressure member is pressed against the shaft by pressing, and the pressure member is configured to maintain the moving member in the second state.

  According to the friction damper of the present invention configured as described above, when the friction damper is applied to a seismic isolation structure including a damping device, excessive vibration energy exceeding the absorption capability of the damping device acts on the building structure. The moving member is detached from the guide groove and set in the second state. Thereby, the friction member presses the shaft. As a result, a frictional resistance is always generated between the friction member and the shaft, and excessive vibrational energy acting on the building structure is absorbed and attenuated due to the generation of the frictional resistance, so that the swinging width of the building structure with respect to the building base is reduced. Can be suppressed, and furthermore, the shaking of the building structure after the end of the earthquake can be terminated early.

It is a perspective view showing an embodiment of a friction damper to which the present invention is applied. FIG. 2 is an exploded perspective view of the friction damper shown in FIG. 1. It is side surface sectional drawing which shows the friction damper of the state in which the moving member is immersed in the guide groove of a shaft. FIG. 4 is an enlarged cross-sectional view illustrating a relationship among a moving member, a pressure-bonding member, and a friction member of the friction damper in the state illustrated in FIG. 3. It is side surface sectional drawing which shows the friction damper of the state from which the said moving member has detached | separated from the guide groove of the shaft. FIG. 6 is an enlarged cross-sectional view illustrating a relationship among a moving member, a crimping member, and a friction member of the friction damper in the state illustrated in FIG. 5. It is a figure which shows the example which applied the friction damper which concerns on 1st embodiment to the seismic isolation structure of a building structure.

  Hereinafter, embodiments of a friction damper to which the present invention is applied will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an embodiment of a friction damper to which the present invention is applied. The friction damper 1 is roughly composed of a shaft 2 and a friction generating mechanism 3 assembled to the shaft 2 so as to be able to advance and retreat. The shaft 2 is formed in a substantially cylindrical shape, and a guide groove 21 is formed on the outer peripheral surface along the axial direction of the shaft 2. The guide grooves 21 are arranged at equal intervals of 120 ° in the circumferential direction of the shaft 2. That is, in the friction damper 1 according to this embodiment, three guide grooves 21 are formed on the shaft 2. In addition, inclined surfaces 22 that are gradually inclined from the bottom surface of the guide groove 21 to the outer peripheral surface of the shaft 2 are formed at both ends in the axial direction of each guide groove 21. Since FIG. 1 is a perspective view of the friction damper 1 of the present invention observed from one direction, only the guide groove 21 on the front side in FIG. 1 is drawn.

  2 and 3 show the inside of the friction damper 1 shown in FIG. 1, FIG. 2 is an exploded perspective view of the friction damper 1, and FIG. 3 is a side sectional view of the friction damper 1. FIG. The friction generating mechanism 3 is formed in a substantially cylindrical shape as a whole, a housing 4 having an outer diameter of the friction generating mechanism 3, and a pin member 5 slidably fitted in the guide groove 21 of the shaft 2. A crimping member 6 having a through-hole through which the shaft 2 passes and formed in a cylindrical shape; a friction member 7 disposed between the crimping member 6 and the shaft 2; and the crimping member 6 pinned And urging means 8 that urges the member 5 toward the member 5. The crimping member 6, the friction member 7 and the biasing means 8 are accommodated in the housing 4.

  The housing 4 is formed in a substantially cylindrical shape, and is formed with insertion holes 41 into which the pin members 5 are inserted at equal intervals of 120 ° with respect to the circumferential direction. Each insertion hole 41 extends from the outer peripheral surface of the housing 4 to the inner peripheral surface.

  The pin member 5 is formed in a substantially cylindrical shape, and stands vertically along the radial direction of the shaft 2. The pin member 5 includes a tip 51 slidably fitted in the guide groove 21 of the shaft 2, and a shaft 52 that is continuous with the tip 51 and is inserted into the insertion hole 41 of the housing 4. It is composed of Further, the shaft portion 52 is positioned with a protrusion portion of the crimping member 6 to be described later and is adjacent to the abutting surface 55 formed continuously in the circumferential direction of the pin member 5 and the abutting surface 55. A recess 53 is formed. The recess 53 is formed continuously in the circumferential direction of the pin member 5, and the protrusion of the pressure-bonding member 6 is separated from the recess 53 in the recess 53, and the abutment surface 55 of the shaft portion 52 is formed on the abutment surface 55. An inclined surface 54 to be moved is formed.

  One pin member 5 having such a configuration is loosely fitted to each guide groove 21 of the shaft 2. That is, three pin members 5 are provided with respect to the shaft 2, and each pin member 5 stands on the shaft 2 at equal intervals of 120 ° in the circumferential direction of the shaft 2.

  Next, the crimping member 6 is formed in a substantially cylindrical shape having a through hole through which the shaft 2 passes. The outer diameter of the crimping member 6 is slightly smaller than or substantially the same as the inner diameter of the housing 4 and is accommodated in the housing 4. The inner peripheral surface of the crimping member 6 facing the friction member 7 forms a first inclined surface 61 that gradually slopes from the end side of the housing 4 to the pin member 5 side.

  Further, on the end surface of the crimping member 6 on the pin member 5 side, a protruding portion 62 that is positioned in contact with the abutting surface 55 of the pin member 5 is continuously formed in the circumferential direction. Also, biasing holes 63 into which spring members 81 of biasing means 8 (described later) are fitted are formed at equal intervals in the circumferential direction on the end surface on the housing 4 side. In the present embodiment, the pair of crimping members 6 are arranged so as to sandwich the three pin members 5 arranged in the circumferential direction of the shaft 2 from the axial direction of the shaft 2. In the present embodiment, the protrusions 62 are continuously provided in the circumferential direction, but the crimping members correspond to the pin members 5 arranged at equal intervals of 120 ° in the circumferential direction of the shaft 2. 6 may be arranged at equal intervals of 120 ° in the circumferential direction with respect to the end surface on the pin member 5 side.

  On the other hand, the friction members 7 are arranged at equal intervals of 120 ° in the circumferential direction of the shaft 2 so as to coincide with the arrangement positions of the pin members 5. That is, three friction members 7 are provided on the shaft 2 so as to surround the shaft 2 from the circumferential direction. Each friction member 7 is formed with an insertion hole 71 into which the pin member 5 is inserted, extending from the inner surface to the outer surface. The inner surface of each friction member 7 is formed in a curved surface having the same center as the outer peripheral surface of the shaft 2, while the outer surface faces the first inclined surface 61 of the crimping member 6 and the insertion hole 71. A second inclined surface 72 that is gradually inclined from the peripheral edge to the end of the housing 4 is formed.

  Further, the length of each friction member 7 in the axial direction of the shaft 2 is set to be longer than the axial length of the guide groove 21 formed in the outer peripheral surface of the shaft 21, or each length in the circumferential direction of the shaft 2. The length of the friction member 7 is set longer than the circumferential length of the guide groove 21. With this configuration, the friction member 7 can be prevented from falling into the guide groove 21 of the shaft 2 when the friction member 7 moves on the guide groove 21. Each friction member 7 configured as described above is disposed between the pressure-bonding member 6 and the shaft 2. That is, in the friction damper 1 according to this embodiment, the members are arranged in the order of the friction member 7, the crimping member 6, and the housing 4 in the radial direction of the shaft 2.

  Energizing means 8 for urging the crimping member 6 toward the pin member 5 is fixed to both ends of the housing 4. The urging means 8 includes a spring member 81 that is retractably fitted into the urging hole 63 of the crimping member 6, a pressing plate 82 that presses the spring member 81 toward the crimping member 6, and the pressing plate. And an adjusting plate 83 for adjusting the position of the shaft in the biaxial direction. The pressing plate 82 and the adjusting plate 83 have a through hole through which the shaft 2 passes and are formed in a substantially disc shape.

  Studs 84 project from the pressing plate 82 at positions facing the urging holes 63 formed in the crimping member 6, that is, at equal intervals in the circumferential direction of the pressing plate 82. The stud 84 is fitted with the spring member 81, whereby the spring member 81 is positioned and fixed with respect to the pressing plate 82. The outer diameter of the pressure plate 82 configured in this manner is set to be substantially the same as or slightly smaller than the inner diameter of the housing 4, and the pressure plate 82 can be slidably contacted within the housing 4. It is accommodated in the housing 4.

  On the other hand, the adjusting plate 83 is screwed with an adjusting bolt 85 for adjusting the position of the pressing plate 82 in the axial direction of the shaft. The adjusting bolt 85 passes through the adjusting plate 83 and passes through the pressing plate. 82 is in contact with the end face. A thread groove is formed on the outer diameter of the adjustment plate 83 and is fixed to both ends of the housing 4 by screwing.

  In the biasing means 8 configured as described above, the adjustment bolt 85 adjusts the axial position of the pressing plate 82 by rotating the adjustment bolt 85 screwed to the adjustment plate 83 using a jig. Be able to. By adjusting the adjustment bolt 85, the spring member 81 positioned on the pressing plate 82 contracts between the pressing plate 82 and the biasing hole 63 of the pressing member 6, so that the pressing member 6 becomes a pin member. It is energized towards 5. In other words, the biasing means 8 can arbitrarily select the biasing force of the spring member 81 against the crimping member 6 by adjusting the adjustment bolt 85.

  In the friction damper 1 of the present invention having such a configuration, when the tip 51 of the pin member 5 is immersed in the guide groove 21 of the shaft 2, as shown in FIG. The protrusion 62 is separated from the recess 53 of the pin member 5 and is in contact with the abutting surface 55 of the shaft portion 52 constituting the pin member 5. As a result, a reaction force F against the urging force of the spring member 81 acts on the crimping member 6. That is, in the first state in which the tip portion 51 of the pin member 5 is immersed in the guide groove 21, the crimping member 6 is locked by the pin member 5 through the protrusion 62. As a result, a gap is formed between the first inclined surface 61 of the crimping member 6 and the second inclined surface 72 of the friction member 7.

  5 and 6 show a state in which the tip 51 of the pin member 5 is in contact with the outer peripheral surface of the shaft 2, that is, the tip 51 is detached from the guide groove 21 of the shaft 2. FIG. 5 is a side sectional view, and FIG. 6 is an enlarged view showing the positional relationship of the pin member 5, the crimping member 6 and the friction member 7. When the pin member 5 slides on the inclined surface 22 formed in the guide groove 21 of the shaft 2 and rides on the outer peripheral surface of the shaft 2, the crimping member 6 is moved to the pin member 5 by the biasing means 8. The projection 62 of the crimping member 6 is immersed in the recess 53 formed in the shaft 52 of the pin member 5 because it is biased toward the end. Along with this, the first inclined surface 61 of the crimping member 6 and the second inclined surface 72 of the friction member 7 come into contact as shown in FIG.

  At this time, the urging force of the spring member 81 always acts on the crimping member 6, and the crimping member 6 tends to move in the axial direction of the shaft 2 toward the pin member 5. A pressing force P acts on the friction member 7 by the axial movement of the crimping member 6. That is, the crimping member 6 is configured to exhibit a wedge effect between the housing 4 and the friction member 7. The friction member 7 is pressed toward the outer peripheral surface of the shaft 2 by the action of the crimping member 6. In other words, when the pin member 5 is set to the second state, the axial movement of the crimping member 6 caused by the urging force of the urging means 8 is converted into the movement of the friction member 7 in the radial direction of the shaft 2. The first inclined surface 61 of the pressure-bonding member 6 and the second inclined surface 72 of the friction member 7 constitute a motion conversion mechanism.

  Due to the pressing of the friction member 7 against the shaft 2, a frictional resistance is generated between the inner surface of the friction member 7 and the outer peripheral surface of the shaft 2, and the axial movement of the shaft 2 with respect to the friction generating mechanism 3 is The axial movement of the friction generating mechanism 3 with respect to the shaft 2 is restricted.

  As described above, the protrusion 62 of the crimping member 6 is immersed in the recess 53 of the pin member 5, in other words, the tip 51 of the pin member 5 is detached from the guide groove 21 of the shaft 2. Then, the friction member 7 is pressed toward the shaft 2, and a frictional resistance is always generated when the friction generating mechanism 3 moves along the shaft 2.

  In the friction damper 1 according to this embodiment, inclined surfaces 22 are formed at both axial ends of the guide groove 21, and the pin member 5 rides on the outer peripheral surface of the shaft 2 via the inclined surface 22. Although the guide groove 21 is formed as a concave groove without forming the inclined surface 22 with respect to the guide groove 21, the inclined surface is inclined with respect to the tip 51 of the pin member 5. And the pin member 5 may ride on the outer peripheral surface of the shaft 2 through the inclined surface.

  On the other hand, in the friction damper 1 in a state where the pressing force P by the motion conversion mechanism is acting on the friction member 7, the tip portion 51 of the pin member 5 is positioned on the guide groove 21 of the shaft 2. When a hit is applied to the end of the shaft portion 52 of the pin member 5, the tip portion 51 of the pin member 5 is immersed in the guide groove 21 and the recess 53 of the shaft portion 52. The protruding portion 62 slides on the inclined surface 54 formed in the recess 53 against the urging force of the urging means 8 and moves to the abutting surface 55 of the shaft portion 52. Thereby, a clearance gap is formed between the 1st inclined surface 61 of the said crimping | compression-bonding member 6, and the 2nd inclined surface 72 of the said friction member 7, and the press state to the shaft 2 of the friction member 7 is cancelled | released. . As a result, the axial movement of the shaft 2 with respect to the friction generating mechanism 3 or the axial movement of the friction generating mechanism 3 with respect to the shaft 2 becomes free.

  In the friction damper 1 of this embodiment, the pressing state of the friction member 7 against the shaft 2 may be released by hitting the pin member 5 as described above, and the work process by the worker is omitted. From the standpoint of making it possible, a device for pushing the pin member 5 back into the guide groove 21 of the shaft 2 may be provided separately.

  Further, in the friction damper 1 of the present embodiment, as described above, the guide grooves 21 are arranged at equal intervals of 120 ° in the circumferential direction of the shaft 2 with respect to the outer peripheral surface of the shaft 2, and The pin member 5 is loosely fitted. That is, the friction damper 1 of the present embodiment is configured such that the three pin members 5 stand up with respect to the shaft 2. The configuration of the friction damper 1 of the present invention is not limited to this. For example, the guide grooves 21 are provided at equal intervals of 90 ° in the circumferential direction of the shaft 2, and the four pin members 5 stand on the shaft 2. You may comprise as follows.

  FIG. 7 is a diagram showing an example in which the friction damper 1 of the present invention is applied to a seismic isolation structure for a building structure. The base isolation structure includes a base isolation device 101 that insulates the building structure 200 from shaking of the building base 201 and a friction damper 1 provided between the building base 201 and the building structure 200. .

  As the seismic isolation device 101, for example, a laminated rubber formed by stacking rubber plates in multiple layers is used. Further, by arranging a metal plug such as lead in the center of the laminated rubber, the seismic isolation device 101 also functions as an attenuation device. For this reason, in the said seismic isolation apparatus 101, according to the vibration energy with which generation | occurrence | production is assumed for every area, it becomes possible to preset the absorption capability of the vibration energy which the said seismic isolation apparatus 101 can load.

  On the other hand, in the friction damper 1, as shown in FIG. 7, the friction generating mechanism 3 is fixed to the building base 201 via a bracket. Further, the shaft 2 is fixed to the building structure 200 via a so-called linear guide device, and specifically, a track rail constituting the linear guide device is fixed to the building structure 200, A moving block that moves relative to the track rail is fixed to one end of the shaft 2. Thus, by interposing the linear guide device between the shaft 2 and the building structure 200, forces in directions other than the axial direction of the friction damper 1 according to the present invention act on the friction damper 1. However, it is possible to prevent the friction damper 1 itself, which is subjected to the acting force, from being damaged.

  In the seismic isolation structure having this configuration, even if vibration energy within an allowable range in the seismic isolation device 101 propagates from the building base 201 to the building structure 200, the building structure 200 is formed by the damping function of the laminated rubber 101. Regardless of the vibration period of the building base 201, it can swing with its own vibration period. After the end of the earthquake, the laminated rubber 101 exerts a force to suppress the displacement of the building structure 200 with respect to the building base 201, the building structure 200 is pulled back to a predetermined position on the building base 201, and the building structure 200 The vibration can be stopped.

  On the other hand, since the friction generating mechanism 3 is fixed to the building structure 200 in the friction damper 1, the axial direction of the friction generating mechanism 3 with respect to the shaft 2 with the shaking of the building structure 200. Advancing and retracting to and from occurs Here, the axial length of the guide groove 21 formed on the outer peripheral surface of the shaft 2 is set according to the swaying width of the building structure 200 due to the assumed vibration energy, and is allowed in the seismic isolation device 101. When vibration energy within the range acts on the building structure 200, the pin member 5 reciprocates between a pair of inclined surfaces 22 formed at both ends of the guide groove 21. In the second state where the pin member 5 is immersed in the guide groove 21 of the shaft 2, as shown in FIG. 3, the first inclined surface 61 of the crimping member 6 and the second inclined surface 72 of the friction member 7 A gap is formed between the two.

  For this reason, in the state where the vibration energy within the allowable range in the seismic isolation device 101 acts on the building structure 200, the movement composed of the first inclined surface 61 of the crimping member 6 and the second inclined surface 72 of the friction member 7. The conversion mechanism does not act, and the friction member 7 is not pressed toward the outer peripheral surface of the shaft 2 by the crimping member 6. Therefore, the friction generating mechanism 3 can move back and forth in the axial direction of the shaft 2 without receiving the resistance of the friction member 7.

  On the other hand, when an unexpected huge earthquake occurs and excessive vibration energy exceeding the allowable range of the seismic isolation device 101 acts on the building structure 200, the building structure 200 is horizontal to the building base 201. It will shake greatly in the direction. As described above, since the friction generating mechanism 3 is fixed to the building structure 200 via a bracket, the friction generating mechanism 3 moves forward and backward in the axial direction of the shaft 2 as the building structure 200 shakes. Will exercise.

  Due to the forward and backward movement of the friction generating mechanism 3 in the axial direction of the shaft 2, the pin member 5 slides on the inclined surface 22 formed in the guide groove 21 of the shaft 2 and moves on the outer peripheral surface of the shaft 2. I will get on. In other words, the pin member 5 slides on the inclined surface 22 and jumps outward in the radial direction of the shaft 6, and is separated from the guide groove 21 to be set in the second state. With the detachment of the pin member 5, in the friction damper 1, as shown in FIG. 6, the projection portion 62 of the crimping member 6 urged by the spring member 81 of the urging means 8 is formed on the shaft portion 52. It fits in the recessed part 53.

  When the protrusion 62 of the crimping member 6 is fitted into the recess 53 of the pin member 5, the first inclined surface 61 of the crimping member 6 and the friction member 7 are applied by the biasing force of the spring member 81 constituting the biasing means 8. The second inclined surface 72 comes into contact. At this time, since the urging force of the urging means 8 always acts on the crimping member 6, a pressing force acts on the friction member 7, and the friction member 7 faces the outer peripheral surface of the shaft 2. It will be pressed.

  As a result, when the friction generating mechanism 3 moves forward and backward with respect to the axial direction of the shaft 2 together with the building structure 200, the friction generating member 3 is pressed between the friction generating mechanism 3 and the shaft 2 by pressing against the shaft 2. Friction resistance will occur. Due to the generation of this frictional resistance, the vibration energy acting on the building structure 200 is attenuated, and the shaking of the building structure 200 can be forcibly attenuated.

  After the earthquake is over, as described above, with the tip 51 of the pin member 5 positioned on the guide groove 21 of the shaft 2, the end of the shaft portion 52 of the pin member 5 is hit. By adding, the pressing state of the friction member 7 against the shaft 2 is released, and the friction damper 1 can be returned to the initial state.

  According to the friction damper 1 to which the present invention configured as described above is applied, for example, when excessive vibration energy exceeding the absorption capacity of the damping device used together acts on the building structure, the pin member 5 is By setting the two states, the friction member 7 presses the shaft 2. As a result, a frictional resistance is always generated between the friction generating mechanism 3 fixed to the building structure 200 and the shaft 2 fixed to the building base 201, and the generation of this frictional resistance acts on the building structure 200. It is possible to attenuate excessive vibration energy.

  As a result, even if an unexpected huge earthquake occurs and excessive vibration energy acts on the building structure 200, the swing width of the building structure 200 with respect to the building base 201 can be suppressed. It is possible to terminate the shaking of the building structure 200 after the termination at an early stage.

  In the above-described embodiment, the motion conversion mechanism composed of the crimp member 6 and the friction member 7 is arranged so as to sandwich the pin members 5 arranged at equal intervals in the circumferential direction of the shaft 2 from the axial direction of the shaft 2. However, if it is possible to sufficiently absorb excessive vibration energy, the structure of the motion conversion mechanism may be arranged on one side of the shaft 2 with respect to the pin member 5 in the axial direction. .

  Further, in the friction damper 1 according to the above embodiment, the guide groove 21 is arranged at equal intervals of 120 ° in the circumferential direction of the shaft 2 with respect to the outer peripheral surface of the shaft 2, but the friction damper to which the present invention is applied. The configuration of 1 is not limited to this. For example, the guide groove 21 may be configured to be continuous in the circumferential direction of the shaft 2. In this case, in order to prevent the friction member 7 from falling into the guide groove 21 of the shaft 2 when the friction member 7 moves on the guide groove 21, each friction in the axial direction of the shaft 2 is prevented. It is preferable that the length of the member 7 is set longer than the axial length of the guide groove 21.

  Furthermore, in the seismic isolation structure to which the above-described friction damper 1 according to the present invention is applied, the shaft 2 is fixed to the building structure 200, while the friction generating mechanism 3 is fixed to the building base 201. The shaft 2 may be fixed to the building base 201 and the friction generating mechanism 3 may be fixed to the building structure 200.

  In addition, as an example of use of the friction damper 1 to which the present invention is applied, the application to the seismic isolation structure has been described. However, the use example of the friction damper 1 is not limited to this, and is widely applied. be able to. For example, it can be arranged between two machines or devices installed in a building structure and used as a vibration control device for these structures.

  DESCRIPTION OF SYMBOLS 1 ... Friction damper, 2 ... Shaft, 5 ... Moving member (pin member), 6 ... Crimp member, 7 ... Friction member, 21 ... Guide groove, 53 ... Recessed part, 62 ... Projection part

Claims (3)

A shaft in which a guide groove along the axial direction is formed on the surface, and a first state where the surface of the shaft is moved along the axial direction and is immersed in the guide groove of the shaft, and a second state where the guide groove is detached A moving member set to any one of the above, a pressure-bonding member biased toward the moving member and locked by the moving member set to the first state, and a friction member selectively pressed against the shaft And comprising
When the moving member is set in the second state, the crimping member is unlocked by the moving member, the friction member is pressed against the shaft by the pressing of the crimping member, and the crimping member is moved. A friction damper characterized in that the member is maintained in the second state. The moving member is a pin member that is held perpendicular to the shaft, and the pin member includes a tip portion that slides on the surface of the shaft and a shaft portion in which a recess is formed,
The friction damper according to claim 1, wherein the crimping member and the friction member have opposing surfaces that are inclined in the axial direction of the shaft and are opposed to each other. The friction damper according to claim 2, wherein an inclined surface is formed in the concave portion of the pin member for separating the protruding portion of the crimping member from the concave portion.

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