TWI558932B - Attenuating device - Google Patents

Description

Attenuator

The present invention relates to an attenuation device for arranging vibration energy transmitted from a structure that is one of the vibration sources to the other structure between the two structures that are transmitted by the vibration energy.

An attenuating device disclosed in Japanese Laid-Open Patent Publication No. Hei 10-184757 is hereby incorporated. The attenuating device is a device to be obliquely disposed between the columns of the building structure, and the attenuating device is composed of: a rod member coupled to one of the structural members, and is disposed to cover the rod member while being fixed at the other It is composed of a shell member of one of the structures. A spiral thread groove is formed in a peripheral surface of the rod member, and a nut member that can rotate the shell member is screwed into the thread groove. Further, a cylindrical drum to be priced in the shell member is fixed to the nut member, and a peripheral surface of the drum is a accommodating chamber in which a viscous fluid is formed to face the inner peripheral surface of the shell member.

The attenuating device configured as described above, when the vibration acting between the two structures causes the rod member to advance and retreat toward the nut member in the axial direction, the nut member converts the axial movement of the rod member into a rotational motion. As the nut member rotates, the roller fixed to the nut member also rotates. At this time, since the gap between the outer peripheral surface of the drum and the inner peripheral surface of the shell member is a accommodating chamber formed as a viscous fluid, when the drum rotates, the frictional shear force corresponding to the rotation angle of the drum acts on the accommodating chamber. A viscous fluid that heats the viscous fluid. That is, the attenuation device converts the vibration energy between the structures into rotational energy and converts the rotational energy into thermal energy, and as a result, the vibration energy transmitted between the structures can be attenuated.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 10-184757

The damping force generated by such an attenuating device is proportional to the surface area of the roller that contacts the viscous fluid. Therefore, if it is desired to increase the damping force, the length of the drum in the axial direction must be set to be long. Based on this, the entire length of the damping device is formed to be long irrespective of the total length of the rod or the stroke amount, and the attenuation device is enlarged in size.

The present invention has been made in view of the above problems, and an object of the invention is to provide an attenuation device capable of effectively performing vibration energy attenuation of propagation between two structures while achieving downsizing.

In order to achieve the above object, the damping device of the present invention includes: a fixed cylinder fixed to the first structure and formed into a tubular shape having a hollow portion; fixed to the second structure and housed in the hollow portion of the fixed cylinder And a shaft member having a spiral thread groove formed on the outer surface; a screw member screwed to the shaft member and capable of converting the axial direction movement of the shaft member into a rotary motion; and being disposed in a radial direction with respect to the fixed barrel The outer side is formed in a cylindrical shape to cover the fixed cylinder, and a cylindrical accommodating chamber is formed between the outer peripheral surface of the fixed cylinder and the outer side of the accommodating chamber in the radial direction. The member is provided with a rotating roller member; and a viscous fluid sealed in the housing chamber.

In the damping device of the present invention configured as described above, the roller member that rotates together with the nut member is formed in a cylindrical shape so as to cover the fixed cylinder, and is located outside the storage chamber of the viscous fluid in the radial direction. Therefore, the attenuating device of the present invention is capable of disposing the attenuating device of the present invention when the outer diameter of the attenuating device is the same as that of the prior art attenuating device which is disposed radially inside the receiving chamber of the viscous fluid. The moment of inertia of the roller member is set to be large. Further, since the roller member disposed so as to cover the fixed cylinder can be freely set due to the thickness thereof, the moment of inertia can be further increased by the increase in mass.

Therefore, the roller member can function as an inertia wheel, and can act to accelerate and decelerate the rotational motion of the nut member caused by the vibration of the structural body, and convert the vibration energy of the structural body into the energy of the rotational motion of the body to absorb the energy. . In this way, the amplitude of the vibration can be suppressed, and the vibration acting on the structure can be suppressed.

Further, the viscous fluid directly acts on the rotation of the roller member caused by the vibration of the structure, and in addition to attenuating the vibration energy of the structure, the movement of the roller member such as the function of the inertia wheel can be performed. Energy attenuation.

That is, according to the present invention, the vibration-damping action of the vibration generated by the moment of inertia of the roller member and the damping action of the vibration generated by the viscous fluid are combined, whereby the attenuation of the vibration energy can be performed more efficiently.

[Best Embodiment of the Invention]

Hereinafter, the attenuation device of the present invention will be described in detail based on the drawings.

Fig. 1 is a half cross-sectional view showing a first embodiment of an attenuation device to which the invention is applied. The damping device 1 includes a fixed cylinder 2 having a hollow portion and having a tubular shape at one end thereof, and is disposed to be inserted into a hollow portion of the fixed cylinder 2 as a shaft member from an opening of the fixed cylinder 2 The screw shaft 3; the nut member 4 screwed to the screw shaft 3 via a plurality of balls 5; and the roller member 6 rotatably supported by the fixed barrel 2 while being coupled to the nut member 4. The attenuating device is, for example, attenuated by vibration transmitted between the foundation of the building and the building, and the fixed cylinder 2 is fixed to the building which is the first structural body through the connecting rod 20, and the snail is The shaft 3 is a base whose one end is fixed to the second structure.

The fixed cylinder 2 is a fixing sleeve 21 that is complementary to the roller member 6 to form a viscous fluid accommodating chamber, and is formed in a cylindrical shape and fixed to one end of the fixing sleeve 21 in the axial direction. The bearing bracket 22 on the shaft is formed. The connecting rod 20 is coupled to the fixed sleeve 21 at an end portion on the opposite side of the bearing holder 22.

The roller member 6 is supported by a rotary bearing 44 fitted to a peripheral surface of the bearing holder 22 and a rotary bearing 61 disposed at one end of the fixed sleeve 21 on the opposite side of the bearing holder to rotate the fixed cylinder 2 freely. The above-described rotary bearing 61 is an inclined roller bearing. The rotary bearing 44 that is close to the nut member 4 is configured to be capable of being sufficiently supported by using a reciprocating roller bearing that can load a larger load than the inclined roller bearing. The radial load and the axial load acting on the roller member 6 from the nut member 4 described above.

On the other hand, the nut member 4 is fixed to the end portion of the roller member 6 in a state in which the rotary bearing 44 is adjacent to the rotary bearing 44. Fig. 2 is a perspective view showing an example of a combination of the nut member 4 and the screw shaft 3. A spiral ball rolling groove 31 is formed on a peripheral surface of the screw shaft 3, and the nut member 4 is screwed to the screw shaft 3 via a plurality of balls 5 that roll in the ball rolling groove 31. The nut member 4 is formed in a substantially cylindrical shape and has a through hole through which the screw shaft 3 is to be penetrated. A spiral ball rolling is formed on the inner peripheral surface of the through hole so as to face the ball rolling groove 31 of the screw shaft 3. Groove. Further, the nut member 4 has an infinite circulation path of the balls 5, and the nut member 4 can be moved in a spiral shape around the screw shaft 3 by the infinite circulation of the balls 5. That is, the screw shaft 3 and the nut member 4 are configured as a ball screw device. Further, a flange portion 41a is formed on the outer peripheral surface of the nut member 4, and a bolt hole 41b through which the fixing bolt is to be inserted is provided in the flange portion 41a, and the nut member 4 is locked by a fixing bolt. It is bonded to the above-described roller member 6.

As described above, the nut member 4 is screwed to the screw shaft 3, and the end portion of the screw shaft 3 is fixed to a structure of a so-called foundation or building, so that the vibration of the structure causes the screw shaft 3 to move in the axial direction. This translational movement is converted into a rotational movement of the nut member 4 such that the roller member 6 coupled to the nut member 4 is rotated around the fixed barrel 2.

On the other hand, the roller member 6 is formed in a cylindrical shape, and the inner peripheral surface thereof and the outer peripheral surface of the fixed sleeve 21 are opposed to each other, so that the storage chamber 8 of the viscous fluid 7 is formed between the two. The accommodating chamber 8 is filled with a viscous fluid 7 such as eucalyptus oil. Further, an annular seal member 81 is fitted to both ends of the accommodating chamber 8 in the axial direction, thereby preventing the viscous fluid 7 sealed in the accommodating chamber 8 from leaking from the gap between the fixed sleeve 21 and the drum member 6.

In the damping device 1 of the present embodiment configured as described above, when the vibration between the fixed cylinder 2 and the screw shaft 3 acts in the axial direction of the screw shaft 3, the vibration energy causes the screw shaft 3 to repeatedly advance and retreat in the axial direction. The repeated advance and retreat causes the screwing to rotate around the screw shaft 3 while the nut member 4 of the screw shaft 3 is repeatedly reversed.

At this time, when the roller member 6 is rotated around the fixed cylinder 2, the frictional shear force acts on the viscous fluid 7 enclosed in the accommodating chamber 8, and the rotational energy of the roller member 6 is converted into a viscous fluid. 7 thermal energy consumption. As a result, the vibration energy propagating between the first structure and the second structure can be attenuated.

Further, since the roller member 6 is disposed not on the inner side of the fixed cylinder but outside the fixed cylinder, the attenuation device of the present embodiment and the roller member are disposed inside the fixed cylinder when the outer diameter of the damping device is the same. In comparison with the previous device, the moment of inertia of the roller member can be set to be large. Further, since the roller member 6 disposed so as to cover the fixed cylinder 2 can be freely set by the thickness thereof, the moment of inertia can be further increased by the increase in mass.

Fig. 3 is a view showing an example of the structure of the roller member 6 in which the magnitude of the moment of inertia of the roller member 6 can be increased or decreased, and the state in which the roller member 6 is viewed from the axial direction is shown. This structure is a peripheral surface of the cylindrical member 6 formed in a cylindrical shape, and is formed so that the rod-shaped member 6a which is an additional mass extending in the axial direction of the roller member 6 can be fixed to the periphery of the roller member 6 by the bolt 6b. surface. The rod-shaped member 6a is configured to be fixed to a plurality of positions in which the peripheral surface of the roller member 6 is equally divided by the axial direction, and the rod-shaped members 6a of the same mass are equally fixed to the periphery of the roller member 6. The surface can be configured to maintain the smoothing moment of the roller member 6 while increasing its moment of inertia. Further, the size of the moment of inertia of the roller member 6 can be arbitrarily set by arbitrarily changing the mass of the rod-shaped member 6a.

Therefore, the roller member 6 can function as a inertia wheel, and converts a part of the vibration energy of the structure into the energy of the body rotation motion, and can often act to prevent the screw shaft 3 from accelerating and decelerating in the axial direction. . In this way, the amplitude of the vibration can be suppressed, and the vibration of the second structure of the first structure can be suppressed. Further, the viscous fluid 7 enclosed in the accommodating chamber 8 contributes to the attenuation of the rotational motion energy stored in the drum member 6 as the inertia wheel.

In other words, according to the damping device of the first embodiment, the damping action by the viscous fluid enclosed in the storage chamber and the vibration-damping action by the moment of inertia of the roller member can be combined. Further, the attenuation of the vibration energy is performed efficiently. Therefore, according to the attenuating device of the present invention, compared with the prior art attenuating device which relies only on the viscous fluid to cause the damping effect, it is possible to suppress the axial length of the roller member, thereby miniaturizing the device as a whole, and Knowing the attenuation device to the same extent, the attenuation capability can be improved.

Next, a second embodiment of the damping device of the present invention will be described.

Fig. 4 is a view showing a second embodiment of the damping device to which the present invention is applied. In the first embodiment, the roller member 6 which is formed in the accommodating chamber 8 in which the fixed cylinder 2 is formed as the viscous fluid 7 is itself configured to have a function as an inertia wheel. However, in the second embodiment, the roller member 6 is separately provided. The inertia wheel is different from the roller member 6, and is configured to transmit the rotational motion of the nut member generated by the translational movement of the screw shaft in the axial direction to both of the inertia wheel and the roller member.

The damping device according to the second embodiment is a fixed cylinder 23 having a hollow portion formed in a cylindrical shape, and a screw shaft 30 inserted in a hollow portion of the fixed cylinder 23, and being screwed to each other via a plurality of balls The nut member 40 of the screw shaft 30, and the cylindrical bearing shell 50 which is rotatably supported by the fixed cylinder 23 while having the nut member 40, and the inertia wheel rotatably supported by the bearing housing 50 60, and a communication restriction means 70 for restricting the upper limit of the communication torque while transmitting a torque between the bearing housing 50 and the inertia wheel 60, and a rotation restricting means 70 is coupled to the inertia wheel 60 while being rotatably supported by the fixed cylinder 23. The roller member 80 is constructed.

A connecting rod 24 is coupled to one end of the fixed cylinder 23 to block the hollow portion. For example, the fixed cylinder 23 is fixed to the building as the first structure through the connecting rod 24, and the screw shaft 30 has one end fixed to the base as the second structure.

The fixed cylinder 23 into which the shaft end of the screw shaft 30 is inserted has a function of a bearing holder at its end, and an inner wheel of a pair of double roller bearings 25 is fitted to the outer surface of the portion. Further, the outer ring of the double row roller bearing 25 is fitted to the inner circumferential surface of the bearing housing 50, and the bearing housing 50 is supported by the fixed cylinder 23 through a pair of double roller bearings 25. The nut member 40 is fixed to one end of the bearing housing 50 in the axial direction, and when the nut member 40 is rotated, the bearing housing 50 and the nut member 40 are simultaneously rotated around the fixed barrel 23.

The screw shaft 30 and the nut member 40 can directly use the screw shaft 3 and the nut member 4 shown in Fig. 2 described in the first embodiment. The axial end of the screw shaft 30 is fixed to the base of the second structural body as in the first embodiment, so that when the screw shaft 30 is translated in the axial direction, the nut member 40 is rotated on the screw shaft 30 according to the translational movement. Around this, the rotation is transmitted to the bearing housing 50 described above.

A cylindrical inertia wheel 60 is provided outside the bearing housing 50. The inertia wheel 60 is supported by the bearing housing 50 via a ball bearing 62, and is configured to be rotatable in the bearing housing 50. Further, since the bearing housing 50 can be freely rotated on the fixed cylinder 23, the inertia wheel 60 can also be freely rotated in the fixed cylinder 23.

The above-described transmission restricting means 70 is provided between the bearing housing 50 and the inertia wheel 60, and is configured such that the inertia wheel 60 rotates together with the rotation when the bearing housing 50 rotates. Fig. 5 is a view showing a detailed configuration of the above-described communication restriction means 70. The communication restricting means 70 is an annular restricting belt 71 that is bonded and fixed to the outer peripheral surface of the bearing housing 50 in a state of being wound around the circumferential direction, and an adjustment to be inserted into the inertia wheel 60. The hole 63 is simultaneously slidably attached to the pressing pad 72 of the regulating belt 71, and the adjusting bolt 73 that is screwed from the outer peripheral surface side of the inertia wheel 60 to the adjusting hole 63, and is disposed on the pressing pad 72 and The pad spring pushing member 74 between the screws 73 is inspected.

The adjustment hole 63 is provided in plural in the circumferential direction of the inertia wheel 60, and the pressing pad 72 is disposed in the adjustment hole 63. Therefore, the above-described restriction belt 71 is in contact with a plurality of pressing pads 72. Further, although the coil springs of the plurality of sheets are overlapped and the pad spring pushing member 74 is inserted into the adjustment hole 63, if the pressing pad 72 can be pushed by the locking bolt 73, the above-mentioned pressing pad 72 The pad spring pushing member 74 may be another elastic member such as a coil spring or a rubber sheet.

In the communication restriction means 70 of the above configuration, when the adjustment bolt 73 is locked, the pad spring pushing member 74 is compressed according to the degree of the locking amount, and the pressing pad 72 is pressed by the compressed pad. The spring is pushed to the inner side in the radial direction of the inertia wheel 60, and the pressing pad 72 is pressed against the restriction belt 71 fixed to the bearing housing 50. Therefore, the frictional force acting between the pressing pad 72 and the regulating belt 71 is adjusted by the locking amount of the adjusting bolt 73, and the frictional force is increased when the locking amount of the adjusting bolt 73 is increased. A large torque can be transmitted between the bearing housing 50 and the inertia wheel 60. Conversely, when the locking amount of the adjusting bolt 73 is reduced, the frictional force acting between the pressing pad 72 and the regulating belt 71 is reduced, and the torque that can be transmitted between the bearing housing 50 and the inertia wheel 60 is reduced. Will decrease.

That is, by adjusting the locking amount of the adjusting bolt 73, the magnitude of the torque that can be transmitted between the bearing housing 50 and the inertia wheel 60 can be arbitrarily adjusted. It is assumed that if the moment acting on the bearing housing 50 or the inertia wheel 60 exceeds the torque that can be transmitted, the pressing pad 72 will slide on the restriction belt 71 only between the pressing pad 72 and the restriction belt 71. The frictional balance torque is transmitted from the inertia wheel 60 to the bearing housing 50 or from the bearing housing 50 to the inertia wheel 60.

On the other hand, around the fixed cylinder 23, the drum member 80 which is adjacent to the bearing holder 50 in the axial direction is provided. The roller member 80 is supported by the outer peripheral surface of the fixed cylinder 23 via the rotary bearing 82, and is coupled to the inertia wheel 60, and is configured to rotate around the inertia wheel 60 around the fixed cylinder 23. As in the first embodiment, the inner peripheral surface of the roller member 80 is a accommodating chamber that faces the outer peripheral surface of the fixed cylinder 23 to form a viscous fluid. When the roller member 80 rotates, the frictional shear force acts on the accommodating chamber. The viscous fluid that is filled causes the energy of the rotational movement of the roller member 80, which in turn attenuates the energy of the rotational motion of the inertia wheel 60.

In the damping device according to the second embodiment configured as described above, when the vibration acting between the first structural body and the second structural body causes the screw shaft 30 to advance and retreat in the axial direction, the nut member screwed to the screw shaft 30 40 will rotate around the screw shaft 30, and the rotation will be transmitted to the bearing housing 50. When the locking amount of the adjusting screw 73 of the communication restricting means 70 is relatively large, and the pressing pad 72 does not slide against the regulating belt 71, the rotation of the nut member 40 is transmitted to the inertia wheel through the bearing housing 50. 60, the rotation is in turn communicated to the roller member 80.

Therefore, as in the first embodiment described above, the rotation of the roller member 80 causes the frictional shear force to act on the viscous fluid enclosed in the accommodating chamber, and the energy of the rotational movement of the roller member 80 is converted into the heat of the viscous fluid. energy consumption. As a result, it is possible to attenuate the vibration energy propagating between the first structure and the second structure.

Further, in the second embodiment, the roller member 80 is different from the roller member 80, and the inertia wheel 60 is provided on the outer side in the radial direction of the roller member 80. Therefore, the magnitude of the moment of inertia of the inertia wheel 60 can be arbitrarily set. When the screw shaft 30 reciprocates in the axial direction, the inertia wheel 60 repeats while performing acceleration and deceleration while reversing, so that the vibration energy of the structure is partially converted into the energy of the body rotation motion, often The action reaches the acceleration and deceleration of the above-mentioned screw shaft 3 in the axial direction. As a result, the vibration of the second structure of the first structure can be suppressed. Further, since the inertia wheel 60 and the roller member 80 are coupled in series, the energy of the rotational motion accumulated by the inertia wheel 60 is attenuated by the action of the viscous fluid.

In other words, in the damping device of the second embodiment, the damping effect by the viscous fluid and the vibration-damping action by the moment of inertia of the inertia wheel 60 are doubled, so that the vibration energy can be effectively attenuated. Further, as long as the size and mass of the inertia wheel 60 are arbitrarily designed, the damping capability can be arbitrarily set.

Here, the inertia wheel 60 stores the angular momentum caused by its own rotation. Therefore, for example, when the nut member 40 and the bearing housing 50 exceed the center of the reverse motion, the bearing housing 50 and the snail are rotated from the inertia wheel 60. The cap member 40 acts on a moment corresponding to the angular momentum of the inertia wheel 60. In order to convert more vibration energy into the energy of the rotational motion of the inertia wheel 60, it is more effective to set the moment of inertia of the inertia wheel 60 to be larger, but when the moment of inertia becomes larger, the angular momentum retained by the inertia wheel 60 will also be Become bigger. Therefore, a large moment is applied to the bearing housing 50 and the nut member 40 from the inertia wheel 60 during deceleration of the bearing housing 50 and the nut member 40.

On the other hand, the rotational movement of the nut member 40 is restricted by the reciprocating motion of the screw shaft 30 in the axial direction, and therefore, when the nut member 40 is linked to the movement of the screw shaft 30, it is desired to decelerate, if the inertia wheel 60 is used. When a large moment is applied to the nut member 40 to rotate the nut member 40, the majority of the balls arranged between the nut member 40 and the screw shaft 30 are excessively compressed, which may damage the screw shaft 30 and the nut. The connection of the member 40 and the inertia wheel 60.

In the above-described state, the conveyance restricting means 70 allows the pressing pad 72 to slide on the restriction belt 71, and acts to rotate the bearing housing 50 and the nut member 40 from the rotation of the inertia wheel 60. In other words, the maximum torque that the nut member 40 can load is found from the relationship between the nut member 40 and the allowable load in the axial direction, and the locking amount of the adjusting screw 73 of the communication restricting means 70 is based on the maximum torque. It is determined that when the torque equal to or greater than the maximum torque acts on the bearing housing 50 from the inertia wheel 60, the above-described transmission restricting means 70 causes the rotation of the bearing housing 50 to be released from the rotation of the inertia wheel 60. When the amount of locking of the adjusting screw 73 is determined as described above, even if the inertia wheel 60 acts on the bearing housing 50 and the nut member 40 to cause a constant rotation, the torque is applied to the bearing member 50 and the nut member 40. When the maximum torque that can be applied by the nut member 40 is exceeded, the inertia wheel 60 and the roller member 80 connected thereto in series are continuously rotated independently of the decelerating bearing housing 50, so that excessive torque can be prevented from acting on the nut. Member 40.

Further, the damping device 100 of the present embodiment is such that the roller member 80 is coupled to the inertia wheel 60 instead of the bearing housing 50 coupled to the nut member 40, and is coupled to the inertia wheel 60 at the inertia wheel. When the rotation of 60 is released from the rotation of the nut member 40 as described above, the roller member 80 rotates together with the inertia wheel 60 regardless of the rotation of the nut member 40. Therefore, when the rotation of the inertia wheel 60 is released from the rotation of the nut member 40 as described above, the attenuating action of the viscous fluid described above does not act on the rotation of the nut member 40, but acts on the rotation of the inertia wheel 60. The angular momentum of the inertia wheel 60 can be attenuated.

It is assumed that when the above-described roller member 80 is assumed not to be coupled to the inertia wheel 60 but to the bearing housing 50 and the nut member 40, after the rotation of the inertia wheel 60 is released from the rotation of the nut member 40, there is no positive means. The angular momentum of the inertia wheel 60 can be attenuated, and the inertia wheel 60 continues to rotate while the angular momentum is stored. In this case, it takes a long time for the inertia wheel 60 to be coupled to the nut member 40 again. Therefore, the vibration acting on the screw shaft 30 must be reduced only by the damping action of the viscous fluid until the time of recombination. However, in this way, the meaning of the inertia wheel 60 having a large moment of inertia is lost.

On the other hand, when the roller member 80 is often rotated together with the inertia wheel 60, when the rotation of the inertia wheel 60 is released from the rotation of the nut member 40, the viscous fluid acts to attenuate the angular momentum of the inertia wheel 60. Therefore, the sliding between the restriction belt 71 and the pressing pad 72 of the above-described conveyance restriction means 70 is terminated early, and the inertia wheel 60 and the bearing housing 50 are rotated together again. As a result, the inertia wheel 60 and the viscous fluid can again contribute to attenuating the rotational motion of the nut member 40, thereby attenuating the vibrational energy propagating between the first structure and the second structure.

In other words, in the damping device 100 of the second embodiment, the moment of inertia of the inertia wheel 60 is set to be large and effective to attenuate the vibration energy, and at the same time, the inertia wheel 60 having a large moment of inertia acts on the nut member 40. When the torque is excessively large, the inertia wheel 60 is separated from the nut member 40, whereby the damage of the damping device 100 can be prevented.

Further, in order to prevent breakage of the damping device 100, even if the inertia wheel 60 is separated from the nut member 40, the angular momentum retained by the inertia wheel 60 can be immediately reduced, and the inertia wheel 60 and the nut member 40 can be recombined at an early stage. Therefore, the attenuation of the inertia wheel 60 and the viscous fluid can be effectively applied to the vibration of the screw shaft 30 in the axial direction.

1. . . Attenuator

2. . . Fixed cylinder

twenty one. . . Fixed sleeve

twenty two. . . Bearing bracket

20. . . Connecting rod

3. . . Screw shaft

31. . . Ball rolling groove

4. . . Nut member

41a. . . Flange

41b. . . Bolt hole

44. . . Rotary bearing

5. . . Ball

6. . . Roller member

6a. . . Rod member

6b. . . bolt

61. . . Rotary bearing

7. . . Viscous fluid

8. . . Containment room

81. . . Sealing member

100‧‧‧Attenuation device

23‧‧‧ fixed cylinder

24‧‧‧ Connecting rod

25‧‧·Repeated roller bearings

30‧‧‧Spiral shaft

40‧‧‧ Nut components

50‧‧‧ bearing shell

60‧‧‧Inertial wheel

62‧‧‧Ball bearings

63‧‧‧Adjustment hole

70‧‧‧Consultation means

71‧‧‧Restricted belt

72‧‧‧Pushing pad

73‧‧‧Adjustment bolts (adjustment screws)

74‧‧‧Battery push members

80‧‧‧Roll member

82‧‧‧Rotary bearings

Fig. 1 is a front half sectional view showing a first embodiment of the damping device of the present invention.

Fig. 2 is a perspective view showing an example of a combination of a screw shaft and a nut member.

Fig. 3 is a side view showing the structure for adjusting the moment of inertia of the drum member.

Figure 4 is a front half cross-sectional view showing a second embodiment of the damping device of the present invention.

Fig. 5 is an enlarged view showing a configuration of a communication restriction means provided in the attenuation device shown in Fig. 4.

1. . . Attenuator

2. . . Fixed cylinder

3. . . Screw shaft

4. . . Nut member

6. . . Roller member

7. . . Viscous fluid

8. . . Containment room

20. . . Connecting rod

twenty one. . . Fixed sleeve

twenty two. . . Bearing bracket

41a. . . Flange

44. . . Rotary bearing

61. . . Rotary bearing

81. . . Sealing member

Claims (4)

An attenuation device comprising: a fixed cylinder (2) fixed to a first structure and having a hollow portion in a tubular shape; fixed to the second structure; and housed in the fixed cylinder (2) a shaft member (3) formed in the hollow portion and having a spiral thread groove on the outer peripheral surface; a nut member screwed to the shaft member and capable of converting the axial direction movement of the shaft member into a rotary motion (4) The fixed cylinder (2) is disposed on the outer side in the radial direction, and is formed in a cylindrical shape to cover the fixed cylinder (2), and a cylindrical housing chamber is formed between the outer peripheral surface of the fixed cylinder (8) a reticular fluid (7) sealed by the nut member (4) and a viscous fluid (7) sealed in the accommodating chamber (8) outside the accommodating chamber (8). The damping device according to the first aspect of the invention, wherein a cylindrical inertia wheel (60) is disposed outside the nut member (4) and the roller member (6) in a radial direction, the inertia wheel (60) ) is combined with the above-described nut member (4). The damping device according to claim 2, wherein the inertia wheel (60) transmits a restriction means for restricting an upper limit value of a torque that can be transmitted between the inertia wheel and the nut member (70). ) is combined with the above nut member. An attenuation device as described in claim 3, wherein The rotation of the nut member (4) is transmitted to the drum member (6) through the communication restriction means (70) and the inertia wheel (60).