JP2002021918A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide vibration isolation device capable of effectively preventing the rocking vibration while attaining a long period of vibration isolation object by using air springs capable of minimizing the height. SOLUTION: The air springs 13 have an inside member 15 projected upward from a base board 15, an outside member 16 for covering an upper end part of the inside member 15 at a proper interval and a rolling seal member 17 for sealing these inside member 15 and outside member 16 while allowing a relative movement of both. Respectively pairs of hydraulic cylinder devices 14 and 14a are arranged in both left and right end parts and both front and rear end parts of a building 11. An upper oil chamber of one hydraulic cylinder device 14 is communicated with a lower oil chamber of the other hydraulic cylinder device 14a, and a lower oil chamber of one hydraulic cylinder device 14 is communicated with an upper oil chamber of the other hydraulic cylinder device 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vibration isolator,
In particular, the present invention relates to an anti-vibration device that enables an effective long period of a structure using an air spring and prevents rocking vibration of an object to be isolated in that case.

[0002]

2. Description of the Related Art An anti-vibration device is a base to which vibrations of the ground and floor are input, and a vibration-damping object such as a building, precision equipment, other equipment or devices that dislike vibration, and articles installed on the base. A so-called period increasing means is provided between the base and the vibration-isolating target object. The vibration input to is reduced.

[0003] Various elastic bodies represented by laminated rubber, coil springs, air springs and the like are employed as the period increasing means. In particular, since the air spring is a spring that utilizes the compression elasticity of air, it is softer than other springs, and exhibits excellent characteristics in prolonging the period of the vibration-isolated object. For this reason, it is preferable to use an air spring as a vibration isolator, and an excellent vibration isolator can be provided by utilizing the vertical spring force and horizontal spring force (lateral rigidity) of the air spring.

A bellows type air spring is generally used as the air spring. A typical structure thereof is a bellows-shaped cylindrical rubber bellows having peaks and valleys formed in the circumferential direction. , And a metal face plate that covers the top and bottom,
An intermediate ring fitted to the valley portion of the rubber bellows. The vertical spring of the air spring is obtained by the elastic force when the air sealed in the rubber bellows is compressed with the expansion and contraction of the rubber bellows,
The horizontal spring is obtained by the restoring force generated depending on the enclosed air pressure and the rigid nature of the rubber bellows.

[0005] By the way, the bellows-type air spring, which has a reduced height of rubber bellows, that is, a number of bellows steps, is used in order to enhance the supportability of the vibration-isolated object with a large load.
Since the volume of the air chamber is small, the air pressure rises excessively with respect to the relative vertical amplitude between the base and the vibration-isolated object, and the rubber bellows expand beyond the allowable amount, resulting in durability. Problems arise. Therefore, in order to increase the volume of the air chamber in order to suppress an excessive rise in the air pressure, the number of rubber bellows is increased to increase the air spring. However, when the air spring is raised in this way, the rubber bellows easily buckles, and it becomes difficult to cope with a large load and a large amplitude intended for a large earthquake.

[0006]

Therefore, as a method for avoiding the buckling of the rubber bellows, the present inventor proposes to use a rolling seal type air spring instead of the bellows type air spring. The rolling seal type air spring is provided with a solid inner member and a hollow cylindrical outer member which are arranged concentrically at appropriate intervals, and a horizontal gap between the outer periphery of the inner member and the inner periphery of the outer member. And a flexible cylindrical rolling seal member that is folded back so as to hang down. The rolling seal member is folded back at its intermediate portion, its inner peripheral portion is fitted along the outer periphery of the inner member, and its end is hermetically attached to the upper end of the inner member, and its outer peripheral portion is placed along the inner periphery of the outer member. The end is hermetically attached to the upper end of the outer member to seal an air chamber formed between the inner and outer members.

When the inner member and the outer member are vertically displaced relative to each other due to vibration input, the folded portion of the rolling seal member is lifted up by a horizontal gap,
It can be brought down. At this time, the pressure acting on the air chamber acts on the rolling seal member, and the folded portion of the rolling seal member is a portion that closes a horizontal gap between the inner member and the outer member, and the folded portion is It will receive the pressure in the air chamber. Thereby, the volume change of the air chamber is allowed,
In the rolling seal type air spring, it is possible to achieve a longer cycle while keeping the overall height low.

On the other hand, when the air spring is used as described above,
Although such a soft spring works advantageously for increasing the period of the vibration-isolated object, there is a problem that rocking vibration is easily generated on the vibration-isolated object.

In view of the foregoing, the present invention has been made in view of the above-mentioned conventional problems, and achieves a longer period of the vibration-isolated object by using an air spring whose height can be suppressed to a low level, while locking the object. It is an object of the present invention to provide a vibration isolator capable of effectively preventing vibration.

[0010]

In order to achieve the above object, a vibration isolator according to the present invention is provided between a base to which vibration is input and an object to be isolated above the base. An inner member protruding from one side of the vibration target toward the other side, and an inner member protruding from the other side of the base or the vibration-isolation target toward the one side, and appropriately spaced apart in the vertical and horizontal directions. An outer member of a hollow cylindrical body surrounding the outer periphery of the member, and the outer member is folded back so as to hang down in a horizontal gap between the inner periphery of the outer member and the outer periphery of the inner member. The inner end of the base member is hermetically attached to the inner member, and the outer peripheral portion thereof is hermetically attached to the outer member along the inner periphery of the outer member. Vibration target Along with the vertical relative displacement of the inner member and the outer member with the vertical relative displacement of the inner member and the outer member, the inner member and the outer member are displaced up and down in the horizontal gap, and from the horizontal gap between the outer member and the inner member. A flexible cylindrical rolling seal member forming a gas-enclosed space, and between the base and the vibration-isolated object, on both sides of a rocking center of rocking vibration generated in the vibration-isolated object. A pair of hydraulic cylinder devices are arranged vertically at appropriate intervals in the horizontal direction, and an upper oil chamber of one hydraulic cylinder device, a lower oil chamber of the other hydraulic cylinder device, and a lower oil chamber of the one hydraulic cylinder device. The chamber and the upper oil chamber of the other hydraulic cylinder device communicate with each other.

With this arrangement, when the rocking vibration occurs, the oil chambers of the paired hydraulic cylinder devices communicate with each other on the pressurized side and the depressurized side. Rocking vibration can be prevented.

Further, between the hydraulic cylinder device and the base or the object to be vibration-isolated, horizontal movement guide means for guiding the relative movement in the horizontal direction is provided. Can work effectively.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a vibration isolator according to the present invention. FIG. 1 is a sectional front view showing the entire structure of the vibration isolator, FIG. 2 is an enlarged sectional view of an air spring, and FIG. FIG. 4 is an enlarged sectional view of a main part showing the arrangement of the hydraulic cylinder device.

The vibration isolator 10 according to the present embodiment shows a case where a building 11 is used as a vibration isolating object. As shown in FIG. 1, air or the like is provided between the building 11 and a foundation 12 as a base. It is schematically constituted by interposing an air spring 13 filled with gas and a pair of hydraulic cylinder devices 14 and 14a. The natural period of the building 12 is extended by the soft spring force of the air spring 13 and the hydraulic cylinder device is used. The rocking vibration of the building 12 is prevented by 14, 14a.

The air spring 13 is formed as a rolling seal type air spring (hereinafter, simply referred to as an air spring). As shown in FIG. 2, the air spring 13 is an inner member 15 projecting upward from the foundation 12 side. A hollow cylindrical outer member 16 projecting downward from the building 11 side and surrounding the outer periphery of the inner member 15 at appropriate intervals in the vertical and horizontal directions; and the inner member 15 and the outer member 16. And a rolling seal member 17 that seals the space between them while permitting relative movement between them.

The inner member 15 protrudes from a substrate 15a fixed to the base 12, and an upper end facing the outer member 16 is opened through an opening 15b.
A hollow chamber 15c communicating with the opening 15b is formed to have a hollow cylindrical shape, and a lower end of the inner member 15 is integrally fixed to the substrate 15a and closed.

On the other hand, the outer member 16 has an inverted U-shaped cross section formed by an end plate 16a opposed to the upper end of the inner member 15 at an appropriate interval and a peripheral wall 16b suspended annularly from the outer periphery of the end plate 16a. As shown in FIG. 3, the peripheral wall 16b concentrically surrounds the outer periphery of the upper end portion of the inner member 15 at appropriate intervals, and the end plate 16a is provided on the lower surface of the building 11. Fixed. The space closed by the top plate 16a of the outer member 16 and the rolling seal member 17 from the hollow chamber 15c of the inner member 15 via the opening 15b is formed as a main gas filled space 18.

The rolling seal member 17 is disposed in a horizontal gap between the outer periphery of the inner member 15 and the inner periphery of the peripheral wall 16b of the outer member 16, and is disposed outside the main gas filled space 18 side. Seal member 19 and second seal member 20 arranged in parallel toward
It is constituted by and. These first and second seal members 1
Reference numerals 9 and 20 are each formed of a fiber-reinforced rubber as a raw material so as to form a cylindrical shape in a natural state, and a middle portion thereof is folded back so that one side is turned over. It is attached across the member 16.

That is, the first and second seal members 19, 2
When 0 is folded back at the intermediate portion, one end on the flipped side becomes outer peripheral portions 19a and 20a, and the other end on the opposite side becomes inner peripheral portions 19b and 20b. Then, the inner peripheral portions 19b and 20b are made to extend along the outer periphery of the upper end portion of the inner member 15, and the outer peripheral portions 19a and 20a are made to extend along the inner periphery of the peripheral wall 16b of the outer member 16. At this time, the inner peripheral parts 19b, 20b and the outer peripheral parts 19a, 20
Each end of a is air-tightly fixed to the inner member 15 and the outer member 16 along which each ends. In this state, the first and second seal members 19 and 20 are folded back 19c,
20c hangs down between the outer periphery of the inner member 15 and the inner periphery of the outer member 16 to seal between them, and the inner member 15, the outer member 16 and the first seal member 19 are sealed.
Are formed as the main gas filled space 18, and a space surrounded by the first seal member 19 and the second seal member 20 is formed as a sub gas filled space 21.

Therefore, the air spring 1 constructed as described above is used.
Reference numeral 3 denotes a base 12 when vibration such as an earthquake is input.
When the building 11 and the building 11 are relatively displaced up and down, the inner member 15 and the outer member 16 are displaced up and down relative to this, resulting in a change in the volume in the main gas-filled space 18 formed therebetween. While the air pressure is changed. When the volume of the main gas filled space 18 is changed in this manner, the first and second seal members 19 and 20 have the inner peripheral portions 19b and 20b and the outer peripheral portions 19a and 20a formed on the outer periphery of the inner member 15 and the inner periphery of the outer member 16. They will be moved up and down alternately.

The first and second seal members 19, 2
The air pressure P2 lower than the air pressure P1 of the main gas-filled space 18 is sealed in the sub-gas-filled space 21 formed between 0, and the differential pressure (P1-P2) is applied to the folded portion 19c of the first seal member 19. ) And a low air pressure P2 is applied to the folded portion 20c of the second seal member 20, so that the folded portions 19c and 20c
To reduce the substantial pressure borne by.
Thereby, the durability of the rolling seal member 17 can be improved, and the supporting load of the air spring 13 can be increased.

The paired hydraulic cylinder devices 14, 1
In this embodiment, as shown in FIG. 1, one set of 4a is arranged at both left and right ends of the building 11, and one set is arranged at both ends (not shown) in the front-rear direction (perpendicular to the paper surface). The hydraulic cylinder devices 14 and 14a include a cylinder 22 filled with hydraulic oil, a piston 23 slidably fitted in the cylinder 22, and a piston 2
3 and a piston rod 24 which is protruded and retracted from the cylinder 22. The inside of the cylinder 22 is provided with an upper oil chamber 22a and a lower oil chamber 22 by a piston 23.
b.

The cylinder 22 is integrally mounted on a mounting seat 25 fixed to the lower surface of the building 11,
At the tip of the piston rod 24 projecting downward from the cylinder 22, a seat 26 is attached.
6 is supported on the foundation 12 via a linear bearing rail 27 as horizontal movement guide means. The linear bearing rail 27 is configured such that the upper and lower two-level rails are orthogonal to each other, and the horizontal movement in the front, rear, left and right directions is guided.

In this embodiment, as shown in FIG. 4, an upper oil chamber 22a of one of the pair of hydraulic cylinder devices 14, 14a and a lower oil chamber of the other hydraulic cylinder device 14a, as shown in FIG. 22b and the lower oil chamber 22b of the one hydraulic cylinder device 14 and the upper oil chamber 22a of the other hydraulic cylinder device 14a are communicated via a communication pipe 28a. .

With the above configuration, the vibration isolator 1 of the present embodiment is provided.
In the case of 0, when the inner member 15 and the outer member 16 are relatively displaced in the vertical direction by the vertical vibration component of the input vibration, the air spring 13 changes the pressure in the main gas filled space 18 accordingly, At this time, the vertical elastic function of the building 11 is extended by the compression elasticity of the air, so that the natural period of the building 11 in the vertical direction is made longer so that the vertical vibration is effectively eliminated. In this case, since the air spring 13 is configured as a rolling seal type, when the inner member 15 and the outer member 16 are relatively displaced in the vertical direction, the first and second seal members 19 and 20 along the outer periphery of the inner member 15. And the outer peripheral portions 19a and 20a of the first and second seal members 19 and 20 along the inner periphery of the outer member 16 are alternately moved up and down, so that the volume change of the main gas filled space 18 is reduced. Since it is permitted, it is possible to achieve a long cycle while suppressing the height of the air spring 13 to be low.

At the time of inputting the vertical vibration, the building 11
The pair of hydraulic cylinder devices 14, 14a provided on the front, rear, left, and right sides of the upper and lower hydraulic chambers 22a, 22b respectively provide hydraulic pressure in the upper oil chamber 22a and the lower oil chamber 22b.
At a, they are changed in phase with each other. Therefore, the upper and lower oil chambers 22, 22 of both hydraulic cylinder devices 14, 14a are provided.
a, the pressurized side of one hydraulic cylinder device 14 is released to the decompressed side of the other hydraulic cylinder device 14a through one of the communication pipes 28 and 28a, and the pressurized side of the other hydraulic cylinder device 14a is communicated. The oil is released to the pressure reducing side of one hydraulic cylinder device 14 through the other of the pipes 28 and 28a. For this reason, the hydraulic cylinder devices 14 and 14a are prevented from becoming a resistance against vertical vibration isolation of the building 11.

The hydraulic cylinder devices 14, 14
a is the base 12 via the linear bearing rail 27.
Can be displaced relative to all directions in the horizontal direction, so that when horizontal vibration components are input, they can be prevented from being damaged.

When the inner member 15 and the outer member 16 are relatively displaced in the horizontal direction with respect to the horizontal vibration component of the input vibration, the air spring 13 also controls the air pressure sealed in the main gas sealing space 18. The horizontal spring function is exerted by the restoring force generated depending on the above and the rigid properties of the first and second seal members 19 and 20, and the horizontal natural period of the building 11 can be lengthened and horizontal vibration isolation can be achieved. it can.

That is, the vibration isolator 10 of the present embodiment has the linear bearing rail 27,
Effective three-dimensional vibration isolation can be achieved by effectively utilizing the vertical vibration isolation function and the horizontal vibration isolation function of the air spring 13. Of course, when only vertical vibration isolation is performed, the necessity of using the linear bearing rail 27 is eliminated.

By the way, in the vibration isolator 10 of the present embodiment, the vibration of the building 11 is performed using the air spring 13 having a soft spring, so that the building 11 is liable to generate rocking vibration. That is, this rocking vibration is caused by the building 1
In this embodiment, when the rocking vibration occurs, the upper oil chamber 22a and the lower oil chamber of the hydraulic cylinder devices 14, 14a are vibrated in such a manner that the front and rear or left and right horizontal ends of the hydraulic cylinder device 1 are vertically oscillated in opposite phases. The oil pressure in 22b resists this.

That is, both the upper oil chamber 22a of one hydraulic cylinder device 14 and the lower oil chamber 22b of the other hydraulic cylinder device 14a are pressurized or depressurized,
The lower oil chamber 22b of one hydraulic cylinder device 14 and the upper oil chamber 22a of the other hydraulic cylinder device 14a are both depressurized or pressurized. Accordingly, the communication pipes 28, 28a communicating between the hydraulic cylinder devices 14, 14a communicate between the pressurized sides and the depressurized sides of the hydraulic cylinder devices 14, 14a, respectively. At this time,
Since the hydraulic oil sealed in each cylinder 22 is incompressible, it forms a pair of hydraulic cylinder devices 14, 14.
As for a, the movement of each piston 23 is prevented, whereby the vertical displacement of the building 11 with respect to the foundation 12 can be prevented and the building 11 can be locked, so that the rocking vibration of the building 11 can be prevented.

In the present embodiment, the linear bearing rail 27 is used as the horizontal movement guide means and is disposed between the hydraulic cylinder devices 14, 14a and the foundation 12, but the present invention is not limited to this.
4, 14a and the building 11 can also be arranged.
Of course, the horizontal movement guide means is not limited to the linear bearing rail 27, but may be any member, mechanism, or device that can reduce the movement resistance in the horizontal direction. In addition, the hydraulic cylinder devices 14, 14a are paired, and one set is disposed at each of the front, rear, left, and right ends of the building 11, but each of the hydraulic cylinder devices 14, 14a disposed at the front, rear, left, and right is used for locking. The object can be achieved by arranging them at appropriate intervals in the horizontal direction so as to form a pair on both sides of the oscillation center of vibration.

Further, the air spring 13 of the present embodiment is configured such that the rolling seal member 17 is connected to the two first and second seal members 1.
Although the configuration is made up of 9, 20, it is needless to say that one or three or more can also be used. Further, the inner member 15 is
Although the side member and the outer member 16 are provided on the building 11 side, the same function can be obtained by disposing the inner member 15 and the outer member 16 in reverse. Furthermore, in the above-described embodiment, the earthquake has been described as an example of the input vibration. However, it is needless to say that the vibration can be isolated while preventing the rocking vibration of the building 11 even if it is a traffic vibration or a daily vibration.

[0034]

As described above, the anti-vibration device of the present invention achieves a longer period of the vibration-isolated object by using a rolling seal type air spring. A pair of hydraulic cylinder devices are arranged vertically on the both sides of the rocking center of the rocking vibration generated on the vibration-isolated object, horizontally spaced apart from each other, and one hydraulic cylinder device The upper oil chamber of the hydraulic cylinder device and the lower oil chamber of the other hydraulic cylinder device, and the lower oil chamber of one hydraulic cylinder device and the upper oil chamber of the other hydraulic cylinder device communicate with each other. When rocking vibration occurs, the pressurized side and the depressurized side are communicated with each other, and the rocking vibration of the vibration-isolated object can be prevented by the incompressibility of each sealed oil.

Further, since the horizontal movement guide means for guiding the relative movement in the horizontal direction is provided between the hydraulic cylinder device and the base or the object to be isolated, damage to the hydraulic cylinder device due to horizontal vibration can be prevented. Thereby, not only the vertical vibration isolation but also the horizontal vibration isolation of the air spring can be effectively utilized, and the three-dimensional vibration isolation can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an entire configuration showing an embodiment of a vibration isolation device according to the present invention.

FIG. 2 is an enlarged sectional view of an air spring used in one embodiment of the vibration isolator according to the present invention.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, showing one embodiment of the vibration isolator according to the present invention.

FIG. 4 is an enlarged sectional view of a main part of an arrangement configuration of a hydraulic cylinder device showing an embodiment of a vibration isolator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolation device 11 Building 12 Foundation 13 Rolling seal type air spring 14, 14a Hydraulic cylinder device 15 Inner member 16 Outer member 17 Rolling seal member 18 Gas filled space 19a, 20a Outer part 19b, 20b Inner part 19c, 20c Folded part 27 Linear bearing rail 28, 28a Communication pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 5/43 E04B 5/43 F E04H 9/02 331 E04H 9/02 331Z F16F 9/05 F16F 9/05 15/04 15/04 A F term (reference) 2E001 DG02 DH31 FA11 FA21 GA01 GA07 GA08 GA09 GA24 GA26 HE01 HE07 HE09 HF16 LA03 LA18 3J048 AA06 AC04 BE02 BE03 EA38 3J069 AA28

Claims (2)

[Claims] An inner member provided between a base to which vibration is input and a vibration-isolation target above the base, and protruding from one of the base or the vibration-isolation target toward the other side; An outer member of a hollow cylindrical body protruding from the other of the base or the vibration-isolation target object toward one side and surrounding the outer periphery of the inner member at appropriate intervals in the vertical and horizontal directions; Folded and arranged so as to hang down in a horizontal gap between the inner periphery and the outer periphery of the inner member, the inner peripheral portion of the inner member is hermetically attached to the inner member along the outer periphery of the inner member, An outer end portion of the outer member is hermetically attached to the outer member along an inner periphery of the outer member. relative A flexible cylindrical rolling seal member that is raised and lowered in the horizontal gap in accordance with the position and forms a gas-enclosed space from the horizontal gap to the outer member and the inner member. Along with the base and the vibration-isolated object, a pair of hydraulic cylinder devices on both sides of the center of the rocking vibration of the rocking vibration generated in the vibration-isolated object, and a hydraulic cylinder device in the vertical direction at appropriate intervals in the horizontal direction. And the upper oil chamber of one hydraulic cylinder device communicates with the lower oil chamber of the other hydraulic cylinder device, and the lower oil chamber of the one hydraulic cylinder device communicates with the upper oil chamber of the other hydraulic cylinder device. A vibration isolation device characterized by the following. 2. The apparatus according to claim 1, wherein horizontal movement guide means for guiding the relative movement in the horizontal direction is provided between the hydraulic cylinder device and the base or the object to be isolated. Vibration isolation device.