JP2000274474A - Damping arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increase of an inner pressure due to thermal expansion of a fluid and to maintain a fluid seal function in an excellent state, in a damping device utilizing resistance of the fluid and the generation of heat. SOLUTION: A casing 10 is coupled to one object part L1. A rotary body 20 is rotatably contained in the casing 10 and the rotary body 20 is coupled to the other object L2 through a boosting mechanism 30. Relative displacement between object parts L1 and L2 is converted into rotation of the rotor 20 through threaded engagement between the screw rod 32 of the boosting mechanism 30 and a nut 31. A closed space 50 closed by a seal member 51 is formed between the rotor 20 and the casing 10 and a viscous fluid 40 is contained in the closed space 50. A recessed part 54 serving as a chamber filled with gas is formed in the casing 10, the recessed part 53 is partitioned as a closed space 50 by an elastic partition wall 55 and served as to release the increase of a volume due to thermal expansion of the viscous fluid 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for converting kinetic energy associated with relative displacement between target parts, for example, kinetic energy generated due to relative displacement between two target parts of a building structure during an earthquake or the like, into fluid. The present invention relates to an apparatus for converting heat energy into heat energy and attenuating the heat energy.

[0002]

2. Description of the Related Art An apparatus for attenuating energy or the like at the time of an earthquake is disclosed in, for example, Japanese Patent Application Laid-Open Nos.
It is known as disclosed in JP-A-184786. The damping device disclosed in the publication includes a casing connected to one target, a viscous fluid contained in the casing, a rotating body rotatably contained in the casing, and a rotating body rotatably contained in the casing. And a screw nut mechanism (double speed mechanism) interposed between the first and second parts. The screw nut mechanism includes a screw shaft connected to the other target portion, and a nut provided on the rotating body and screwed to the screw shaft.

[0003] In the damping device having the above structure, when kinetic energy is generated due to relative displacement between the target parts as in the case of an earthquake, the screw shaft is displaced in the axial direction with respect to the casing. Then, the rotating body rotates by the screwing action between the screw shaft and the nut, and the viscous fluid in contact with the rotating body generates heat due to frictional resistance or the like. As a result, the kinetic energy is converted into heat energy of the viscous fluid and attenuated.

[0004]

In the above damping device, a sealing member is interposed between the casing and the rotating body in order to prevent the viscous fluid from leaking to the outside and maintain good damping performance. Is required. By the way, the viscous fluid generates heat at the time of the damping action and thermally expands, so that the pressure is increased and an excessive load is imposed on the seal member. The same applies to the case of thermal expansion accompanying an increase in the outside air temperature. Therefore, the life of the seal member is shortened. In particular, when performing sealing while the seal member is in contact with a rotating body that rotates at a high speed, as in the damping device of the above publication,
If the high pressure is continuously applied, the life of the sealing member is significantly reduced.

[0005]

According to a first aspect of the present invention, a casing connected to one target portion, a fluid contained in the casing, and a fluid connected to the other target portion and relatively displaceable in the casing. A moving body accommodated in the casing, and utilizing the resistance of the fluid accompanying the relative displacement of the moving body with respect to the casing, to convert the kinetic energy associated with the relative displacement between the target portions into thermal energy and attenuate the energy. A seal member is arranged between the casing and the moving body, a sealed space is formed in the casing, the fluid is contained in the sealed space, and a chamber filled with gas is formed in the casing. The chamber and the closed space are separated by an elastic partition.

According to a second aspect of the present invention, in the damping device according to the first aspect, the fluid comprises a viscous fluid, the moving body comprises a rotating body rotatably housed in a casing, and the rotating body has a double speed. Connected to the other target portion via a mechanism, the double speed mechanism includes a screw shaft connected to the other target portion, and a nut provided on the rotating body and screwed with the screw shaft, In the casing, a concave portion serving as the chamber is formed on a wall surface facing the rotating body, and the elastic partition wall is fixed to the opposing wall surface so as to cover the concave portion. According to a third aspect of the present invention, in the damping device according to the second aspect, the outer peripheral surface of the rotating body and the inner peripheral surface of the casing as a wall surface facing the rotating body are coaxial cylindrical surfaces. The gap serves as the closed space and is filled with the viscous fluid, the concave portion is formed in an inner peripheral surface of the casing in an annular shape, and the elastic partition wall closing the concave portion is further formed on the inner peripheral surface of the casing. It is characterized by being fixed in a cylindrical shape.

According to a fourth aspect of the present invention, in the damping device according to the second aspect, the rotating body has a flange protruding in a direction orthogonal to a rotation axis of the rotating body, and the casing opposes both side surfaces of the flange. A pair of the opposing wall surfaces, at least one of the pair of opposing wall surfaces is formed with a concave portion serving as the chamber, and the opposing wall surface is fixed with the elastic partition wall closing the concave portion. Features. A fifth invention is characterized in that a passage connected to the chamber is formed in the casing, and the passage is sealed while the chamber is filled with pressurized gas from the passage. According to a sixth aspect of the present invention, in any one of the first to fourth damping devices, the casing is provided with a passage for communicating the chamber with the outside.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the damping device A is provided, for example, between two target portions L1 and L2 in a building structure. This damping device A has, as a basic configuration, a casing 10 connected to one target portion L1, a rotating body 20 (moving body) rotatably housed in an internal space 10a of the casing 10, a rotating body 20 and the other. Nut mechanism 30 interposed between the target part L2
(A double speed mechanism) and a viscous fluid 40 accommodated in the internal space 10 a of the casing 10. The viscous fluid 40 is also referred to as a viscous body, and includes one having elasticity (viscoelastic body) and one having no elasticity. An example of a viscous fluid is polyisobutylene.

The casing 10 has a cylindrical portion 11 and end walls 12, 13 located at both ends of the cylindrical portion 11. A connecting rod 15 extends from the end wall 12 in the axial direction of the cylindrical portion 11, and a distal end of the connecting rod 15 is connected to the target portion L1.

The rotating body 20 includes a cylindrical portion 21 having a smaller diameter than the cylindrical portion 11 of the casing 10, and an end wall 22 provided at one end of the cylindrical portion 21. In the present embodiment, the nut 31 of the screw nut mechanism 30 described below is
The nut 31 is fixed so as to close the other end of the cylindrical portion 21, and the nut 31 also forms a part of the rotating body 20. The rotating body 20 is rotatably supported by the casing 10 in a state where the cylindrical portion 21 is coaxial with the cylindrical portion 11 of the casing 10. A gap is formed between the outer peripheral surface of the cylindrical portion 21 (the outer peripheral surface forming a cylindrical surface) and the inner peripheral surface of the cylindrical portion 11 (the inner peripheral surface forming a cylindrical surface).

The rotation support mechanism for the rotating body 20 will be described in detail. A cylindrical projection 22 a is formed on the end wall 22 of the rotating body 20, and the projection 22 a is accommodated in a recess 12 a formed on the inner surface of the end wall 12 of the casing 10. A ball bearing 25 is interposed between the end walls 12 and 22, and a ball bearing 26 is also interposed between the nut 31 and the end wall 13 of the casing 10.

The screw nut mechanism 30 includes the nut 31 inserted and fixed in an end opening of the cylindrical portion 21 of the rotating body 20.
And a screw shaft 32 screwed to the nut 31 and coaxial with the cylindrical portion 21. The nut 31 and the screw shaft 32 are screwed via a ball 33. The outer end of the screw shaft 32 is connected to the target portion L2.

As shown in FIGS. 1 and 2, a pair of annular oil seals 51 (seal members) are interposed between both ends of the cylindrical portion 11 of the casing 10 and the cylindrical portion 21 of the rotating body 20. I have. As a result, in the internal space 10 a of the casing 10, the space surrounded by the pair of oil seals 51 and the cylindrical portions 11 and 12 forms an annular closed space 50.
It has become. The viscous fluid 40 is filled in the closed space 50. In the vicinity of both ends of the cylindrical portion 11 of the casing 10, holes 52a for injecting the viscous fluid 40 are provided.
And holes 52b for venting air during the injection are formed, and these holes 52a and 52b are sealed with a sealing material 53 after the filling of the viscous fluid 40 is completed.

As best shown in FIG. 2, an annular concave portion 54 (chamber) is formed in a part of the inner peripheral surface (inner surface) of the cylindrical portion 11 facing the closed space 50. . The concave portion 54 has a cylindrical (cylindrical) elastic partition wall 5.
Blocked by 5. Both ends of this elastic partition 55
In the vicinity of both ends of the concave portion 54, it is fixed to the inner peripheral surface of the cylindrical portion 11 by appropriate means. The closed space 50 and the concave portion 54 are partitioned by the elastic partition wall 55. The seal between the closed space 50 and the concave portion 54 is ensured by the O-ring 56 disposed between both ends of the elastic partition 55 and the cylindrical portion 11.

An air passage 57 (passage) connected to the recess 54 is formed in the cylindrical portion 11 of the casing 10. Via the air passage 57, pressurized air (pressurized gas) of, for example, about 2 atm is filled in the concave portion 54. The air passage 57 is sealed with a sealing material 58 after the filling of the pressurized air is completed. Recess 54
Pressurized air flows through the elastic partition 55 into the closed space 50.
Will face the viscous fluid 40 inside.

In the above configuration, the target portions L1 and L2 are relatively displaced so as to approach or move away from each other with the distortion of the building structure at the time of an earthquake or the like. The kinetic energy associated with the relative displacement is converted into thermal energy and attenuated by the damping device A disposed between the target portions L1 and L2.
The details will be described below.

When the target portions L1 and L2 approach or move away from each other, the screw shaft 32 is displaced in the axial direction with respect to the casing 10. The axial displacement of the screw shaft 32 is converted into rotation of a nut 31 screwed to the screw shaft 32, and causes rotation of the cylindrical portion 21 of the rotating body 20 fixed to the nut 31. The speed of the outer peripheral surface of the cylindrical portion 21
Relative to the casing 10 (the target portion L1,
(Relative displacement speed between L2).

When the cylindrical portion 21 of the rotating body 20 rotates, it receives the frictional resistance of the viscous fluid 40 contained between the cylindrical portion 21 and the cylindrical portion 11 of the casing 10. As a result, the kinetic energy associated with the rotation of the rotating body 20, that is, the kinetic energy associated with the relative displacement of the target portions L1 and L2 is converted into heat energy of the viscous fluid 40 and attenuated, thereby causing the building structure to be subjected to an earthquake. Can be protected from As described above, the screw nut mechanism 30 significantly increases the rotation speed of the cylindrical portion 21 of the rotating body 20 as compared with the relative displacement speed between the target portions L1 and L2, thereby increasing the frictional resistance of the viscous fluid 40. Therefore, the damping effect can be significantly improved.

Pressurized air is sealed in the concave portion 54, and the pressure is applied to the viscous fluid 40 in the sealed space 50 via the elastic partition 55. Therefore, the rotating body 20
The normal pressure of the viscous fluid 40 on the outer peripheral surface of the cylindrical portion 21, that is, the initial pressure before the occurrence of the earthquake, is substantially equal to the air pressure and higher than the atmospheric pressure. Therefore, the frictional resistance of the viscous fluid 40 against the rotation of the rotating body 20 at the time of the occurrence of an earthquake increases, so that more heat is generated and the kinetic energy damping effect can be enhanced. It is considered that the higher the pressure of the pressurized air in the concave portion 54, the greater the damping effect of the viscous fluid 40 is. However, the pressure is limited to an appropriate pressure in order to avoid a burden on the oil seal 51.

The heat generated by the viscous fluid 40 is
Causes thermal expansion. With the thermal expansion of the viscous fluid 40, the elastic partition 55 expands as shown in FIG.
Reduce the volume inside. In other words, the thermal expansion of the viscous fluid 40 can escape to the recess 54. for that reason,
An extremely high pressure (for example, a pressure of 10 atm or more) due to the thermal expansion of the viscous fluid 40 can be prevented from being applied to the oil seal 51, and the sealing function of the oil seal 51 can be favorably maintained for a long time. . Although the viscous fluid 40 thermally expands when the outside air temperature rises, it can absorb the thermal expansion in the same manner as described above. In particular, in the present embodiment, the oil seal 51 is used under severe conditions in contact with the cylindrical portion 21 rotating at a high speed, and thus it is difficult to exhibit a good sealing function under a high pressure. As described above, a situation where a high pressure is applied can be avoided, so that a good sealing function can be exhibited, and leakage of the viscous fluid 40 can be prevented.

The volume of the viscous fluid 40 decreases when the outside air temperature decreases. In this case, the elastic partition wall 55 contracts as shown in FIG. In other words, the amount of contraction of the viscous fluid 40 is
Can be compensated for by increasing the volume of. Therefore, the sealed space 50 becomes negative pressure, and the external air is
, And mixing with the viscous fluid 40 can be reliably prevented, and a decrease in the damping efficiency due to the viscous fluid 40 can be prevented. Instead of the annular recess 54, a recess occupying a limited angle range may be formed. In this case, an elastic partition forming a part of a cylinder may be used instead of the cylindrical elastic partition 55.

Next, a second embodiment of the present invention will be described with reference to FIGS.
The damping device B according to the embodiment will be described. In this damping device A, the shapes of the casing 110, the rotating body 120, and the elastic partition 155 are different from those of the damping device A of the first embodiment. Since the screw nut mechanism 30 is the same as the damping device A, the same reference numerals are given in the drawings, and detailed description thereof will be omitted. The nut 31 of the screw nut mechanism 30 is the first
Like the embodiment, a part of the rotating body 120 is configured. The rotating body 120 has a disk-shaped flange 121 fixed to the outer periphery of the nut 31. The flange 121 is orthogonal to the rotation axis of the rotating body 120.

The casing 110 has a cylindrical shape, and its middle portion has a larger diameter than both end portions. The nut 31 is rotatably supported on end walls 112 and 113 at both ends of the casing 110 via ball bearings 25 and 26. A pair of oil seals 151 is interposed between the outer peripheral surface forming the cylindrical surface of the nut 31 and the inner peripheral surface near both ends of the casing 110. In the internal space of the casing 110, the space between the pair of oil seals 151 is a sealed space 150.

A flange 121 of the rotating body 120 is accommodated in the middle large diameter portion of the casing 110. The large-diameter portion of the casing 110 has a pair of opposed walls 111 facing both side surfaces of the flange 121. This collar 12
A gap between both side surfaces of the pair 1 and inner surfaces (opposing wall surfaces) of the pair of opposing walls 111 occupies most of the closed space 150. An injection hole 152a for the viscous fluid 40 is formed in one of the pair of opposed walls 111, and an air vent hole 15 is formed in the other.
2b are formed, and these holes 152a and 152b are sealed with a sealing material 153.

An annular recess 154 is formed in the flat inner surfaces of the pair of opposed walls 111. This recess 15
Reference numeral 4 is closed by a flat and annular elastic partition 155. The inner peripheral edge and the outer peripheral edge of the elastic partition 155 are fixed to the inner surface of the opposing wall 111 by appropriate means. A pair of O-rings 156 located near the inner peripheral edge and the outer peripheral edge of the concave portion 154 are arranged between each opposing wall 111 and the elastic partition 155. The recess 154 is formed in the facing wall 111.
Is formed. As in the first embodiment, the pressurized air is filled into the recess 154 via the air passage 157, and the air passage 157 is sealed by the sealing material 158.

In the damping device B, when the target parts L1 and L2 are displaced relative to each other, the flange 121 of the rotating body 120 rotates, and the viscous fluid 40 in contact with both side surfaces thereof generates heat due to frictional resistance, resulting in kinetic energy. Attenuate. The function of the pressurized air in the recess 154 and the function of the elastic partition 155 are the same as those of the damping device A, and therefore, detailed description is omitted. The damping device B is used to secure a contact area between the rotating body and the viscous fluid when the distance between the target portions L1 and L2 is relatively short. Note that the concave portion 154 and the elastic partition 155 need not be annular.

The present invention is not limited to the above embodiment, and various modes are possible. For example, in the above two embodiments, the air passages 57 and 157 may be released to the outside without being sealed with the sealing materials 58 and 158. In this case, the concave portions 54 and 154 have the atmospheric pressure, and the initial pressure cannot be applied to the viscous fluid, but the thermal expansion of the viscous fluid 40 can be easily released. The air passages 57 and 157 may be omitted. In this case, the concave portions 54 and 154 are spaces sealed by the elastic partition walls. A relatively large hole may be formed instead of the recesses 54 and 154 as a chamber filled with gas.

In the above-described two embodiments, the nut of the screw nut mechanism is arranged inside the casing to constitute a part of the rotating body. However, this nut may be arranged outside the casing. In this case, the mechanism for rotatably supporting the rotating body on the casing may be provided between the casing and the rotating body, or may be provided between the casing and the nut. The moving body may be a body that moves linearly with respect to the casing, instead of the rotating body. In this case, a piston is provided on the movable body, the interior of the casing is partitioned into two chambers by the piston, and a passage communicating between these chambers is formed in the piston or the casing. The two chambers are filled with a liquid fluid such as oil. In the damping device having such a configuration, in the process in which the moving body moves linearly with respect to the casing, the fluid moves from one chamber to the other chamber via the passage and passes through the orifice of the passage. Generates heat due to distribution resistance,
Thereby, the kinetic energy accompanying the relative displacement between the target parts is attenuated. The target part in which the damping device of the present invention is to be interposed may be not only an architectural structure but also any structure, similarly to the above-mentioned publication.

[0029]

As described above, according to the first aspect of the present invention, a structure in which a gas-filled chamber and a fluid-filled closed space are separated by an elastic partition wall, thereby achieving high pressure due to thermal expansion of the fluid. Can be prevented from being applied to the sealing member, and a good sealing function can be maintained for a long period of time. According to the second aspect, the relative displacement of the target portion can be converted into high-speed rotation of the rotating body by the double speed mechanism, and a very high damping effect can be obtained. The sealing member is
Even under severe conditions in contact with a rotating body rotating at a high speed, a high pressure accompanying the thermal expansion of a viscous fluid can be avoided, so that a good sealing function can be exhibited. Moreover, the chamber that fills the gas includes a concave portion formed on the wall surface of the casing facing the rotating body, and the elastic partition that closes the concave portion is fixed to the opposing wall surface, so that the configuration for avoiding the thermal expansion is simplified. be able to. According to the third invention, the viscous fluid is interposed between the inner peripheral surface of the casing and the outer peripheral surface of the rotating body which form a coaxial cylindrical surface, so that the contact area of the viscous fluid can be widened, and the damping effect can be obtained. Can be further increased. In addition, the chamber that fills the gas is formed in an annular shape on the inner peripheral surface of the casing and is covered with a cylindrical elastic partition, so that the configuration can be further simplified, and the elastic partition can be mounted. Easy. According to the fourth aspect, even when the distance between the target portions is short, the contact area of the viscous fluid can be secured by the flange portion of the rotating body and the pair of opposed wall surfaces of the casing, and a high damping effect can be secured. In addition, the chamber that fills the gas is formed on the wall surface of the casing that faces the flange portion of the rotating body, and is configured to be covered with the elastic partition wall. Therefore, the configuration can be simplified. According to the fifth invention, by increasing the initial pressure of the fluid,
The resistance of the fluid can be increased, and the damping effect can be enhanced. According to the sixth aspect, by releasing the chamber to the atmospheric pressure through the passage, the thermal expansion of the fluid can be reliably released.

[Brief description of the drawings]

FIG. 1 is a sectional view of a damping device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the damping device.

FIG. 3 is an enlarged sectional view of a main part showing a state when a viscous fluid expands in the damping device.

FIG. 4 is an enlarged sectional view of a main part showing a state when a viscous fluid contracts in the damping device.

FIG. 5 is a sectional view of a damping device according to a second embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of the damping device.

[Explanation of symbols]

 L1, L2 Target part A, B Damping device 10, 110 Casing 10a Internal space 11 Cylindrical part 20, 120 Rotating body (moving body) 21 Cylindrical part 30 Screw nut mechanism (double speed mechanism) 31 Nut 32 Screw shaft 40 Viscous fluid 50, 150 Sealed space 51, 151 Oil seal (seal member) 54, 154 Recess (chamber) 55, 155 Elastic partition 57, 157 Air passage (passage) 111 Opposed wall 121 Flange

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 15/02 F16F 15/02 F (72) Inventor Fumiaki Arima 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Tadashi Aragaki 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Eiichi Michioka 3-11-6 Nishigotanda, Shinagawa-ku, Tokyo Tokyo Stock Company In-company (72) Inventor Masahiro Yoshihashi 3-11-6 Nishigotanda, Shinagawa-ku, Tokyo TEK Corporation F-term (reference) 3J048 AA07 AC05 BE04 CB11 EA13 EA38 3J069 AA44 AA50 CC10 CC34 DD38 EE73

Claims (6)

[Claims] A casing connected to one of the target portions, a fluid contained in the casing, and a moving body connected to the other target portion and accommodated in the casing so as to be relatively displaceable; A device that converts kinetic energy associated with the relative displacement between the target parts into thermal energy and attenuates the kinetic energy by utilizing a resistance of a fluid associated with a relative displacement of the movable body with respect to the casing, wherein a distance between the casing and the movable body is reduced. A sealing member is disposed in the casing, a sealed space is formed in the casing, the fluid is contained in the sealed space, a chamber filled with gas is formed in the casing, and the chamber and the sealed space are elastic. An attenuator characterized by being partitioned by a partition. 2. The fluid comprises a viscous fluid, the moving body comprises a rotating body rotatably housed in a casing, and the rotating body is connected to the other target portion via a speed-up mechanism. A double speed mechanism includes a screw shaft connected to the other target portion, and a nut provided on the rotating body and screwed to the screw shaft, and a wall surface facing the rotating body in the casing,
The damping device according to claim 1, wherein a concave portion serving as the chamber is formed, and the elastic partition wall is fixed to the opposed wall surface so as to cover the concave portion. 3. An outer peripheral surface of the rotating body and an inner peripheral surface of a casing as a wall surface facing the rotating body are coaxial cylindrical surfaces, and a gap between the two forms the closed space to form the viscous fluid. Is filled in, the concave portion is formed in an annular shape on the inner peripheral surface of the casing, and the elastic partition wall closing the concave portion is fixed on the inner peripheral surface of the casing in a cylindrical shape. The damping device according to claim 2, wherein 4. The rotating body has a flange protruding in a direction orthogonal to a rotation axis of the rotating body, and the casing has a pair of opposed wall surfaces facing both side surfaces of the flange, and the pair of opposed wall surfaces is provided. The damping device according to claim 2, wherein a concave portion serving as the chamber is formed on at least one of the wall surfaces, and the elastic partition wall closing the concave portion is fixed to the opposed wall surface. 5. A passage formed in the casing and connected to the chamber, and the passage is sealed when the chamber is filled with pressurized gas from the passage. The attenuation device according to any one of claims 1 to 4. 6. The damping device according to claim 1, wherein a passage communicating the chamber with the outside is formed in the casing.