JPWO2008041545A1 - Attenuator - Google Patents

Abstract

It is a damping device that can improve damping performance without increasing the size of the device compared to the conventional one, and can be freely rotated in the fixed outer cylinder (10,107) and the hollow part of this fixed outer cylinder (10,107) A rotating inner cylinder (20, 109) that is accommodated and forms a cylindrical working chamber (50) together with a peripheral wall (11) of the fixed outer cylinder (10, 107), and a screw rod (30, 106) in which a helical thread groove is formed on the outer peripheral surface ), Screw nuts (40, 108) that are screwed onto the screw rods (30, 106) and fixed to the rotating inner cylinders (20, 109), and a viscous fluid sealed in the cylindrical working chamber (50). The fixed outer cylinder (10, 107) has a partition wall (12) for closing one end of the hollow portion, while the rotating inner cylinder (20, 109) is a bottom plate (21) facing the partition wall (12) of the fixed outer cylinder (10, 107). Between the partition wall (12) of the fixed outer cylinder (10, 107) and the bottom plate (21) of the rotating inner cylinder (20, 109), which continues from the cylindrical working chamber (50). Discoid working chamber (51) is formed it said viscous fluid is sealed.

Description

  The present invention relates to a damping device that is disposed between two structures to which vibration is transmitted and that attenuates vibration energy transmitted from one structure as a vibration source to the other structure. Further, the present invention relates to an improvement of a damping device configured to convert vibration transmitted from one structure into energy of rotational motion and to convert the energy of rotational motion into heat energy for consumption.

  As this type of attenuator, those disclosed in Japanese Patent Application Laid-Open Nos. 10-184757 and 2002-5229 are known. As shown in FIG. 5, the damping device is provided between the first structure 100 and the second structure 101, and attenuates vibrations transmitted between them. A screw rod 106 coupled to the structure body 100 and a fixed outer cylinder 107 coupled to the second structure body 101 are provided so as to cover the screw rod 106. The screw rod 106 is formed with a helical thread groove, and a screw nut 108 rotatably supported with respect to the fixed outer cylinder 107 is screwed into the thread groove. That is, the screw rod 106 and the screw nut 108 constitute a ball screw. A cylindrical rotating inner cylinder 109 is fixed to the screw nut 108, and the outer peripheral surface of the rotating inner cylinder 109 is opposed to the inner peripheral surface of the fixed outer cylinder 107 to form a viscous fluid working chamber 110. is doing.

  Therefore, in the damping device 1 having such a structure, when the second structure 101 vibrates with respect to the first structure 100, the screw rod 106 moves forward and backward with respect to the screw nut 108, and the screw nut 108 Rotates with respect to the fixed outer cylinder 107, and the rotating inner cylinder 109 fixed to the screw nut 108 also rotates with respect to the fixed outer cylinder 107. Since the gap between the outer peripheral surface of the rotating inner cylinder 109 and the inner peripheral surface of the fixed outer cylinder 107 serves as a viscous fluid working chamber 110, when the rotating inner cylinder 109 rotates, the viscous fluid in the working chamber 110 is rotated. On the other hand, a shear frictional force according to the rotational angular velocity of the rotating inner cylinder 109 acts, and the viscous fluid generates heat. That is, in this damping device 1, the vibration energy between the second structure 101 and the first structure 100 is converted into rotational energy, and the rotational energy is further converted into heat energy. The vibration energy held by the structure 101 is effectively attenuated.

  As a specific example of use of this damping device, for example, in a structural frame of a building structure, an example in which the damping device is arranged like a brace connecting opposite corners of the structural frame can be given. In such a use example, when distortion occurs in the structural frame due to an earthquake or the like, an axial tensile force or compressive force acts on the damping device, and the screw rod advances and retreats with respect to the fixed outer cylinder. The above-described attenuation effect is exhibited. As a result, the distortion energy of the structural frame is absorbed, and the shaking of the building structure is effectively damped.

Moreover, as another example of use, the example used with the seismic isolation device as an earthquake countermeasure is mentioned. The seismic isolation device is installed between the building structure and its base, and is used to insulate the building structure from the shaking of the base. Even if vibration energy from an earthquake etc. propagates to the building structure, The building structure can swing with its own vibration period regardless of the vibration period of the foundation. However, since the seismic isolation device insulates the shaking of the base from the shaking of the building, the shaking of the building structure will remain after the earthquake has stopped. For this reason, when the damping device described above is provided between the base and the building and building structure, the vibration energy of the building structure is absorbed by the damping device, and the vibration of the building structure can be converged at an early stage.
Japanese Patent Laid-Open No. 10-184757 JP 2002-5229 A

  In the damping device having such a structure, the vibration energy is attenuated according to the shear frictional force acting on the viscous fluid in the working chamber. It is necessary to increase the area of the outer peripheral surface of the rotating inner cylinder, or to reduce the gap between the fixed outer cylinder and the rotating inner cylinder, that is, the thickness of the working chamber.

  However, if the thickness of the working chamber is extremely thin as in the latter case, it becomes difficult to assemble the rotating inner cylinder to the fixed outer cylinder, and high precision is required for the processing of the fixed outer cylinder and the rotating inner cylinder, and the manufacturing is complicated. End up.

  Further, since both ends in the axial direction of the rotating inner cylinder are supported by the fixed outer cylinder via a pair of rotating bearings, when trying to set the area of the rotating inner cylinder facing the working chamber as in the former, The distance between these bearings needs to be set long, and there is a disadvantage that the rotating inner cylinder and the stationary outer cylinder are enlarged.

  Furthermore, when the rotating inner cylinder is actually rotated and a shear frictional force acts on the viscous fluid, the viscous fluid expands due to heat generation, so that the pressure in the working chamber increases and a means for releasing a part of the pressure must be provided. For example, there is a concern that the seal members provided at both ends of the working chamber adjacent to the rotary bearing may be damaged. In order to release a part of the pressure, a buffer container into which a part of the expanded viscous fluid flows may be provided. However, such a buffer container needs to communicate with the working chamber. Is formed in a cylindrical shape between the fixed outer cylinder and the rotating inner cylinder, the buffer container has to be attached to the peripheral wall of the fixed outer cylinder. That is, only the buffer container protrudes from the peripheral wall of the fixed outer cylinder, so that the damping device is enlarged, and the damping device is easily handled and attached to the structure.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an attenuation device capable of improving the attenuation performance without increasing the device size as compared with the conventional device. There is to do.

  Another object of the present invention is to provide a buffer container for releasing a part of the pressure in the working chamber in communication with the working chamber. It is an object of the present invention to provide an attenuation device that is easy to handle and easy to attach to a structure.

  In order to achieve such an object, the damping device of the present invention includes a fixed outer cylinder that is fixed to the first structure and has a hollow portion and is formed in a cylindrical shape, and a hollow of the fixed outer cylinder. A rotating inner cylinder that is accommodated in the unit and is rotatably supported with respect to the fixed outer cylinder, and faces a peripheral wall of the fixed outer cylinder through a predetermined gap, and forms one end of the rotating inner cylinder. A screw rod that is coupled to the structure of 2 and advances and retracts in the axial direction and has a helical thread groove formed on the outer peripheral surface thereof; a screw nut that is screwed into the screw rod and fixed to the rotating inner cylinder; And a viscous fluid sealed in the cylindrical working chamber. The fixed outer cylinder has a partition wall that closes one end of the hollow portion, while the rotating inner cylinder has a bottom plate facing the partition wall of the fixed outer cylinder and is formed in a bottomed cylindrical shape, and the fixed outer cylinder A disk-like action chamber continuous from the cylindrical action chamber is formed between the partition wall and the bottom plate of the rotating inner cylinder, and the viscous fluid is also sealed in the disk-like action chamber.

  According to such a damping device of the present invention, the rotating inner cylinder is formed in a bottomed cylinder shape, and a cylindrical working chamber is formed between the rotating outer cylinder and the peripheral wall of the fixed outer cylinder, and the partition wall of the fixed outer cylinder A disk-shaped working chamber is formed continuously from the cylindrical working chamber. Accordingly, the outer diameter and the axial length of the fixed outer cylinder are the same, and the area of the rotating inner cylinder that is in contact with the viscous fluid can be increased by the provision of the disk-shaped working chamber. Even with a device size comparable to that of the attenuation device, it is possible to improve the attenuation performance.

  In addition, since the disk-shaped working chamber is formed at one end of the cylindrical working chamber, the cylindrical working chamber is opened only at the end opposite to the disk-shaped working chamber. It is sufficient to provide a sealing member for sealing the viscous fluid in the cylindrical working chamber and the disk-shaped working chamber only on one end side of the fixed outer cylinder and the rotating inner cylinder. For this reason, the number of seal members disposed can be minimized, and the concern about leakage of viscous fluid is reduced.

  Further, since the disk-shaped working chamber exists at the axial end of the rotating inner cylinder, when the rotating inner cylinder rotates and a shearing force acts on the viscous fluid in the disk-shaped working chamber, the shaft of the rotating inner cylinder An effect similar to that of the fluid bearing can be expected with respect to the direction, and an axial force acting on the screw nut from the screw rod can be effectively loaded.

  On the other hand, in the damping device of the present invention, since the disk-like action chamber is provided between the partition wall of the fixed outer cylinder and the bottom plate of the rotating cylinder, the disk-like action chamber is sandwiched between the fixed outer cylinder and the partition wall. It is possible to provide a buffer container through which a part of the viscous fluid can flow from the disk-shaped working chamber at the opposing position. Even if a buffer container is provided for the partition wall that closes the hollow portion of the fixed outer cylinder, the axial length of the fixed outer cylinder only slightly increases, and a protrusion is provided on the peripheral wall of the fixed outer cylinder. It will never be done. For this reason, even if it is a case where the said buffer container is provided, it can be set as the damping device which is easy to handle and is easy to attach to the 1st structure and the 2nd structure.

  When such a buffer container is provided, when the rotating inner cylinder rotates with respect to the fixed outer cylinder, and the viscous fluid sealed in the cylindrical action chamber and the disk-like action chamber is thermally expanded by shear friction, these cylindrical shapes As the internal pressure of the working chamber and the disk-shaped working chamber increases, the viscous fluid flows into the buffer container. Further, when the rotating inner cylinder stops and the viscous fluid cools and contracts, the viscous fluid flows out from the buffer container to the disk-like action chamber. However, when the viscous fluid flows from the disk-shaped working chamber into the buffer container, the temperature of the viscous fluid is increased due to the shear frictional heat, and the fluidity is thought to increase. When flowing into the working chamber, the temperature of the viscous fluid has already decreased, and it is considered that the fluidity is lower than that at the time of inflow. Therefore, the viscous fluid in the buffer container is applied with a pressure above a certain level, and even when the fluidity is lowered, the viscous fluid is configured to be pushed out from the buffer container to the disk-shaped working chamber. Is preferred.

  Further, as a configuration that exerts a certain pressure or more on the viscous fluid in the buffer container, a piston that slides in the buffer container is provided, and an elastic means that biases the piston toward the partition wall of the fixed outer cylinder It is conceivable to provide When the piston is provided in the buffer container in this way, the volume of the buffer container can be changed according to the inflow amount of the viscous fluid, thereby preventing the viscous fluid flowing into the buffer container from being mixed with air. And air can be prevented from entering the working chamber.

It is a half sectional view showing a first embodiment of an attenuation device to which the present invention is applied. It is a perspective view which shows the combination of a screw rod and a screw nut. It is sectional drawing which shows an example of the combination structure of a fixed outer cylinder and a rotor. It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows the conventional damping device.

  Hereinafter, the damping device of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a first embodiment of an attenuation device to which the present invention is applied. The damping device 1 attenuates a relative vibration existing between the first structure and the second structure and converges the vibration at an early stage. For example, a building and a base supporting the building Used between and.

  The damping device 1 includes a fixed outer cylinder 10 having a hollow portion and formed in a cylindrical shape, and is accommodated in the hollow portion of the fixed outer cylinder 10 and is rotatably supported with respect to the fixed outer cylinder 10. A rotating inner cylinder 20, a screw rod 30 having a tip inserted into the rotating inner cylinder 20, and a screw nut 40 screwed into the screw rod and fixed to the rotating inner cylinder 20, For example, the fixed outer cylinder 10 is fixed to a building as a first structure using a bolt or the like, while the screw rod 30 is connected to the second through a disk-shaped mounting plate 32 provided at one end thereof. It is fixed to the base as a structure.

  The fixed outer cylinder 10 has a peripheral wall 11 having a constant inner diameter and is formed in a cylindrical shape. One end of a hollow portion surrounded by the front peripheral wall 11 is closed by a partition wall 12, and as a whole, a bottomed cylinder It is formed in a shape. An outer ring of a rotary bearing 13 is fixed to the open end on the opposite side to the partition wall 12, and the rotary inner cylinder 20 is supported in the hollow portion via the rotary bearing 13.

  On the other hand, the rotating inner cylinder 20 is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the peripheral wall 11 of the fixed outer cylinder 10, and is supported in the hollow portion of the fixed outer cylinder 10 by the rotating bearing 13. ing. The rotating inner cylinder 20 has a bottom plate 21 facing the partition wall 12 of the fixed outer cylinder 10, and is formed in a bottomed cylinder shape smaller than the fixed outer cylinder 10 as a whole. The inner ring of the rotary bearing 13 is fixed to the end of the opened rotating inner cylinder 20 on the side opposite to the bottom plate 21, and the screw nut 40 is fixed to the inner ring via a bracket 22. The outer diameter of the screw rod 30 into which the screw nut 40 is screwed is set smaller than the inner diameter of the rotating inner cylinder 20, and the tip of the screw rod 30 penetrating the screw nut 40 is inside the hollow portion of the rotating inner cylinder 20. It is comprised so that it may be inserted in.

  The rotating inner cylinder 20 and the peripheral wall 11 of the fixed outer cylinder 10 face each other with a predetermined gap, and a cylindrical working chamber 50 filled with a viscous fluid is formed between them. Further, the bottom plate 21 of the rotating inner cylinder 20 and the partition wall 12 of the fixed outer cylinder 10 are also opposed to each other with a predetermined gap, and a disc-like working chamber 51 filled with a viscous fluid is formed between them. Yes. The rotating inner cylinder 20 is supported by the fixed outer cylinder 10 in a so-called cantilever structure because the rotating inner cylinder 20 is supported on the peripheral wall 11 of the fixed outer cylinder 10 only by the rotation bearing 13 provided at the open end thereof. The vicinity of the bottom plate 21 is not supported at all with respect to the fixed outer cylinder 10. For this reason, the disk-shaped working chamber 51 located at one end in the axial direction of the rotating inner cylinder 20 communicates with the cylindrical working chamber 50 located around the rotating inner cylinder 20, and the viscous fluid acts as a cylindrical action. It can flow freely between the chamber 50 and the disk-shaped working chamber 51. A ring-shaped seal member 25 is fitted to one end of the cylindrical working chamber 50 adjacent to the rotary bearing 13 to prevent the viscous fluid sealed in the cylindrical working chamber 50 from leaking out. is doing. As the viscous fluid sealed in the cylindrical working chamber 50 and the disc-like working chamber 51, silicone oil having a kinematic viscosity of about 100,000 to 500,000 mm 2 / s (25 ° C.) is used.

  FIG. 2 is a perspective view showing a combination of the screw rod 30 and the screw nut 40. A spiral ball rolling groove 31 is formed on the outer peripheral surface of the screw rod 30, and the screw nut 40 is screwed into the screw rod 30 via a large number of balls 3 rolling in the ball rolling groove 31. ing. Further, the screw nut 40 has a through hole through which the screw rod 30 is inserted and is formed in a cylindrical shape, and is infinite for circulating the ball 3 that has rolled in the ball rolling groove 31 of the screw rod 30. A circulation path is provided. That is, the screw nut 40 and the screw rod 30 constitute a ball screw.

  And the flange part 41 is provided in the outer peripheral surface of this screw nut 40, and as shown in FIG. 3, by fastening the fixing bolt 42 penetrated to this flange part 41 to the said bracket 22, screw nut The rotation of 40 is transmitted to the rotating inner cylinder 21 via the bracket 22 and the inner ring of the rotating bearing 13. The bracket 22 penetrates the inner ring of the rotary bearing 13 and is fastened to the axial end surface of the rotary inner cylinder 20 with a bolt, and protrudes from the end of the peripheral wall 11 of the fixed outer cylinder 10 in the axial direction. Further, the flange portion 41 of the screw nut 40 is fixed to the end portion of the bracket 22 protruding from the fixed outer cylinder 10. Accordingly, the screw nut 40 is not housed inside the fixed outer cylinder 10, and the assembly of the fixed outer cylinder 10 and the rotating inner cylinder 20 can be easily connected to the screw rod 30 by releasing the fastening of the fixing bolt 42. Can be extracted from.

  Since the screw nut 40 converts the forward / backward movement along the X direction of the screw rod 30 into the rotational movement of the rotary inner cylinder 20, an external force along the axial direction of the screw rod 30 acts on the screw nut 40. is doing. For this reason, a cross roller bearing capable of equally applying a radial load and a thrust load is adopted as the only rotary bearing 13 supporting the rotation of the rotary cylinder 20, and from the screw nut 40 to the rotary inner cylinder 20. Is configured to be able to sufficiently apply a thrust load acting on the shaft, that is, an external force acting in the axial direction of the screw rod 30.

  In the damping device configured as described above, when the building holding the fixed outer cylinder vibrates along the arrow X direction in FIG. 1 with respect to the base on which the end of the screw rod is fixed, the vibration is The axial movement of the screw rod 30 with respect to the fixed outer cylinder 10 is advancing and retracting, and the rotating inner cylinder 20 to which the screw nut 40 is fixed rotates around the screw rod 30 in the hollow portion of the fixed outer cylinder 10 along with the advancing / retreating movement. Will do. When the rotating inner cylinder 20 rotates with respect to the fixed outer cylinder 10, a shearing force acts on the viscous fluid existing in the cylindrical action chamber 50 and the disk-like action chamber 51, and the kinetic energy of the rotating inner cylinder 20. Is converted into thermal energy of viscous fluid and consumed, and the kinetic energy of the rotating inner cylinder 20 is attenuated. Thereby, the vibration of the building in the X direction relative to the base can be forcibly damped.

  In particular, in this damping device, the fixed outer cylinder 10 and the rotating inner cylinder 20 are formed in a bottomed cylinder shape, and a disk is formed between the partition wall 12 of the fixed outer cylinder 10 and the bottom plate 21 of the rotating inner cylinder 20 facing the partition wall 12. Since the cylindrical working chamber 51 is provided, the rotating inner surface in contact with the viscous fluid is compared with the damping device having only the cylindrical working chamber 50 facing the peripheral wall 11 of the fixed outer cylinder 10 as in the conventional damping device. The area of the cylinder 20 is enlarged, and a large damping force can be exhibited accordingly.

  Although the damping force is enhanced, the axial length of the fixed outer cylinder is substantially the same as that of the conventional damping device, and the damping force can be increased while avoiding an increase in the size of the device. Thus, if it is sufficient to exhibit the same level of damping force as before, the damping device can be made smaller than before.

  Next, FIG. 4 shows a second embodiment of an attenuation device to which the present invention is applied.

  In the damping device of the second embodiment, a buffer container 60 that contains a viscous fluid is built in the stationary outer cylinder 10, and the viscous fluid is buffered according to the internal pressure of the cylindrical action chamber 50 and the disk-like action chamber 51. 60 to flow into. Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG. 1 are given in FIG. 4 and the detailed description thereof is omitted.

  At the end of the fixed outer cylinder 10, a buffer container 60 is provided at a position facing the disc-like working chamber 51 with the partition wall 12 therebetween. The buffer container 60 is partitioned by a cylindrical sleeve 61 formed integrally with the peripheral wall 11 of the fixed outer cylinder 10, an end cap 62 that closes the sleeve 61, and the partition wall 12. A through hole 63 communicating with the disk-shaped working chamber 51 is formed.

  Further, in the buffer container 60, a piston 64 that slides in the container 60 along the axial direction of the fixed outer cylinder 10, and the piston 64 is disposed between the piston 64 and the end cap 62. And a spring 65 as elastic means for urging the wall toward the partition wall 12. A bellows 66 is provided between the outer peripheral edge of the piston 64 and the end cap 62 to prevent leakage of viscous fluid between the piston 64 and the sleeve 61.

  The piston 64 moves in the sleeve 61 in the axial direction in accordance with the amount of the viscous fluid flowing into the buffer container 60 from the through hole 63, and the capacity of the buffer container 60 is variable. Further, by making the capacity of the buffer container 60 variable according to the inflow amount of the viscous fluid in this way, it is possible to prevent air from being mixed with the viscous fluid in the buffer container 60. Further, by biasing the piston 64 in the direction of the partition wall 12 by the spring 65, the viscous fluid is only generated when the internal pressure of the viscous fluid in the cylindrical action chamber 50 and the disk-like action chamber 51 rises above a certain level. It flows into the buffer container 60 through the through hole 63.

  When the screw rod 30 moves forward and backward with respect to the fixed outer cylinder 10, and the rotating inner cylinder 20 rotates with respect to the fixed outer cylinder 10 in accordance with the forward and backward movement, the cylindrical working chamber 50 and the disk-shaped working chamber. Although a shearing force acts on the viscous fluid existing in 51, the viscous fluid expands by shear frictional heat, and the internal pressure of the viscous fluid in the cylindrical action chamber 50 and the disk-like action chamber 51 increases. At this time, in the damping device of FIG. 4 provided with the buffer container 60, a part of the expanded viscous fluid flows into the buffer container 60 from the disk-like action chamber 51 through the through hole of the partition wall, and thus the cylindrical action chamber 50 and An increase in internal pressure in the disk-like working chamber 51 can be suppressed, and unintended breakage of the seal member 25 is prevented.

  Further, if the piston 65 is urged by the spring 65 and a pressure of a predetermined level or more is always applied to the viscous fluid in the buffer container 60, the rotation of the rotating inner cylinder 20 with respect to the fixed outer cylinder 10 is stopped, When the viscous fluid in the cylindrical working chamber 50 and the disk-shaped working chamber 51 is cooled to room temperature, the viscous fluid flowing into the buffer container 60 can be reliably pushed back to the cylindrical working chamber 50 and the disk-shaped working chamber 51. It becomes. Since the viscosity of the viscous fluid tends to increase as the temperature decreases, it is advantageous to have such a pressurizing means when the viscous fluid flows from the buffer container 60 to the cylindrical action chamber 50 and the disk-like action chamber 51. It is.

  In the damping device according to the second embodiment provided with such a buffer container 60, the buffer container 60 is provided at a position facing the disc-like working chamber 51 across the partition wall 12 of the fixed outer cylinder 10. Therefore, even if such a buffer container 60 is provided, the axial length of the fixed outer cylinder 10 is only slightly increased, and the fixed outer cylinder 10 can be suppressed to the size of the outer diameter of the peripheral wall 11. It becomes possible. Therefore, even when the buffer container is provided, the buffer container does not protrude from the fixed outer cylinder, and the damping device can be easily handled and attached to the structure.

Claims (3)

A fixed outer cylinder (10, 107) which is fixed to the first structure (100) and has a hollow portion and is formed into a cylindrical shape, and is accommodated in the hollow portion of the fixed outer cylinder (10, 107) and is fixed A rotating inner cylinder (20,109) that is rotatably supported with respect to the outer cylinder (10,107) and faces the peripheral wall (11) of the fixed outer cylinder (10,107) with a predetermined gap therebetween to form a cylindrical working chamber (50). ), One end of which is coupled to the second structure (101) and advances and retreats in the axial direction, and a helical thread groove is formed on the outer peripheral surface, and the screw rod (30,106) In a damping device comprising a screw nut (40, 108) screwed and fixed to the rotating inner cylinder (20, 109), and a viscous fluid sealed in the cylindrical working chamber (50),
The fixed outer cylinder (10, 107) has a partition wall (12) that closes one end of the hollow portion, while the rotating inner cylinder (20, 109) is a bottom plate (21) facing the partition wall (12) of the fixed outer cylinder (10, 107). Having a bottomed cylindrical shape,
A disk-shaped working chamber (51) continuous from the cylindrical working chamber (50) is formed between the partition wall (12) of the fixed outer tube (10, 107) and the bottom plate (21) of the rotating inner tube (20, 109). The damping device is characterized in that the viscous fluid is also sealed in the disk-shaped working chamber (51). The fixed outer cylinder (10, 107) is provided with a buffer container (60) at a position facing the disk-shaped working chamber (51) across the partition wall (12), and the pressure in the disk-shaped working chamber (51) The damping device according to claim 1, characterized in that the viscous fluid flows between the disk-shaped working chamber (51) and the buffer container (60) in response to the above. In the buffer container (60), there are provided a piston (64) that slides in the buffer container (60), and elastic means for biasing the piston (64) toward the partition wall (12). The attenuation device according to claim 2, wherein:

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