Friction damper

Abstract

To provide a friction damper with simple construction having characteristics that there is little difference in resistance forces between at initial shock and after slide, and it is difficult to deform slide member under large fastening force, and large frictional force can stably be generated. The friction damper 1 comprising: a cylinder box 2 ; a cylinder member 6 axially fixed in the cylinder box; a slide bearing 7 press-fitted into an inner peripheral surface of the cylinder member; and a shaft 3 made of metal, the shaft being axially slidably press-fitted into an inner peripheral surface of the slide bearing; wherein when the cylinder box and the shaft move axially in relation to each other, an outer peripheral surface of the shaft and the inner peripheral surface of the slide bearing frictionally slide in relation to each other to absorb vibration energy. When the friction damper of the present invention is mounted to an intermediate portion or an end portion of a structural member of a building structure such that the cylinder box and the shaft relatively axially movable with each other, and repeated tensile and compressive forces are added to the structural member of the building structure due to earthquake or the like, the inner peripheral surface of the slide bearing press-fitted into the cylinder member and the outer peripheral surface of the shaft frictionally slide with each other to absorb vibration energy.

1 . A friction damper comprising:
 a cylinder box;   a plurality of cylinder members axially fixed in said cylinder box, a clearance being formed between an outer peripheral surface of each of the cylinder members and an inner peripheral surface of the cylinder box;   a slide bearing press-fitted into an inner peripheral surface of said cylinder member; and   a shaft made of metal, said shaft being axially slidably press-fitted into an inner peripheral surface of said slide bearing;   wherein when the cylinder box and the shaft move axially in relation to each other, an outer peripheral surface of said shaft and the inner peripheral surface of said slide bearing frictionally slide in relation to each other to absorb vibration energy.   
   
   
       2 . The friction damper as claimed in  claim 1 , wherein said slide bearing includes a multi-layered member in which a metal layer on an outer peripheral surface side, a coat layer on an inner peripheral surface side made of synthetic resin compound for coating said metal layer and a junction layer for joining the metal layer and the coat layer are integrally formed with each other. 
   
   
       3 . The friction damper as claimed in  claim 2 , wherein said junction layer is a porous bronze sintered layer. 
   
   
       4 . The friction damper as claimed in  claim 2 , wherein said synthetic resin compound is polytetrafluoroethylene resin containing a filler. 
   
   
       5 . The friction damper as claimed in  claim 4 , wherein said filler is one or at least two selected from a group consisting of heat-resistant resin, reinforcing fiber, phosphate and solid lubricant. 
   
   
       6 . The friction damper as claimed in  claim 2 , wherein said slide bearing is formed by rolling the multi-layered member with the coat layer being inside. 
   
   
       7 . The friction damper as claimed in  claim 1 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion. 
   
   
       8 . (canceled) 
   
   
       9 . The friction damper as claimed in  claim 3 , wherein said synthetic resin compound is polytetrafluoroethylene resin containing a filler. 
   
   
       10 . The friction damper as claimed in  claim 3 , wherein said slide bearing is formed by rolling the multi-layered member with the coat layer being inside. 
   
   
       11 . The friction damper as claimed in  claim 4 , wherein said slide bearing is formed by rolling the multi-layered member with the coat layer being inside. 
   
   
       12 . The friction damper as claimed in  claim 5 , wherein said slide bearing is formed by rolling the multi-layered member with the coat layer being inside. 
   
   
       13 . The friction damper as claimed in  claim 2 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion. 
   
   
       14 . The friction damper as claimed in  claim 3 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion. 
   
   
       15 . The friction damper as claimed in  claim 4 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion. 
   
   
       16 . The friction damper as claimed in  claim 5 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion. 
   
   
       17 . The friction damper as claimed in  claim 6 , wherein said slide bearing has a flange portion at an end portion of a cylindrical bearing portion.