TWI683051B - Seismic isolator - Google Patents

Abstract

A seismic isolator which does not depend on plastic deformation of a flange, and which reduces tensile force transmitted to a laminated rubber, is provided. The seismic isolator 10 includes a laminated rubber 12; attachment holes 16 provided at both end surfaces of the laminated rubber 12 and fixed to attachment surfaces 56, 57 by fixing members 22; and flanges 14A, 14B provided with slits 24, at least one portion of the slits 24 intersecting the shortest straight line L connecting a circumference portion of the laminated rubber 12 with the attachment holes 16.

Description

Shockproof device

The invention relates to an anti-vibration device for anti-vibration of buildings.

The anti-shock device of the building is installed between the foundation and the building to support the building. During an earthquake, the laminated rubber will shear and deform to absorb lateral shaking. Although the laminated rubber has high strength against compressive force, the strength against tensile force is low. Therefore, when the anti-vibration device is subjected to excessive tensile force, the seismic performance of the laminated rubber may be reduced.

In recent years, buildings with a high aspect ratio (such as high-rise buildings with a large ratio of height to width) have been increasing. Buildings with large aspect ratios are prone to the movement (swing) of the whole building to the left and right during an earthquake, strong winds, etc. One side of the building will alternately float from the base, and the anti-shock device has a tensile force.

For example, Patent Document 1 discloses a technique that can reduce the tensile force transmitted to the laminated rubber when the anti-shock device has a tensile force.

Patent Document 1 describes an anti-vibration device in which an upper flange is mounted on a building and a lower flange is mounted on a foundation; wherein, a transmission path that undergoes plastic deformation under tensile force is formed on the lower flange. The transmission path is provided at the anchoring portion of the outer peripheral portion of the flange, and the through hole and the slit are combined to reduce the rigidity of the transmission path against the flange tensile force. When the transmission path has a tensile force, the transmission path will plastically deform, which reduces the tensile force transmitted to the laminated rubber.

Prior technical literature

Patent Literature 1 Japanese Patent Application Publication No. 2012-26491

However, the anti-vibration device of Patent Document 1 has plastic deformation on the flange, and therefore cannot perform the anti-vibration function after plastic deformation.

In view of the above facts, the present invention aims to provide an anti-shock device that does not rely on the plastic deformation of the flange and can reduce the tensile force transmitted to the laminated rubber.

The shockproof device according to the first aspect of the present invention includes: laminated rubber; and flanges provided on both end surfaces of the laminated rubber, forming: a mounting portion fixed to the mounting surface with a fixing member; and, A slit that intersects the shortest straight line connecting the outer peripheral portion of the laminated rubber and the mounting portion at at least one place.

According to the first aspect, when the tensile force acts on the anti-shock device, the tensile force is transmitted between the mounting portion and the laminated rubber through a transmission path that avoids the slit of the flange. Since the slit is formed on the shortest straight line connecting the outer peripheral portion of the laminated rubber and the mounting portion, the transmission path of the tensile force is longer than the shortest straight line connecting the outer peripheral portion of the laminated rubber and the mounting portion.

In this way, compared with the case of the shortest straight line without slits, the deformation of the transmission path becomes easier, and the tensile force transmitted to the laminated rubber can be reduced.

The anti-vibration device of the second aspect of the present invention is in the first aspect, wherein the slit has: an arc-shaped slit formed along the outer periphery of the laminated rubber, crossing the shortest straight line; and the straight line narrow The slit extends from the end of the arc-shaped slit to the outer peripheral end of the flange in the radial direction, avoiding the mounting portion.

According to the second aspect, the transmission path of the tensile force is sandwiched between the arc-shaped slit and the linear slit. Since the linear slit is formed near the mounting portion, the path length of the transmission path can be made longer than that of the request item 1.

The anti-shock device of the third aspect of the present invention is in the second aspect, the fan-shaped flange sandwiched between the arc-shaped slit and the linear slit forms a linear slit, and the linear slit is The arc-shaped slit side and the flange outer circumferential end side alternately extend in the radial direction, and the extended end portion stops inside the flange.

According to the third aspect, a linear slit is formed between the fan-shaped flange of the arc-shaped slit and the linear slit, so that the transmission path of the tensile force of the fan-shaped flange becomes serpentine. By this, the path length of the communication path can be made longer than that of the request item 2.

The anti-shock device of the fourth aspect of the present invention is the first aspect, and the slit has: an arc-shaped slit formed along the outer periphery of the laminated rubber and crossing the shortest straight line; and a For the linear slit, it extends away from the mounting portion at both ends of the arc-shaped slit and extends in the radial direction, and the end portion stops inside the flange.

According to the fourth aspect, the transmission path of the tensile force is formed by winding back and forth along the linear slit from both sides of the arc-shaped slit to the outer peripheral end of the flange. By this, the path length of the communication path can be made longer than that of the request item 1. In addition, since the transmission path becomes two paths sandwiching the fixing member, it can be arranged in a balanced manner, and the flange can be deformed in a balanced manner.

A fifth aspect of the invention is a shockproof device according to the fourth aspect, in which a pair of linear slits are formed between the pair of linear slits and the mounting portion, and between the linear slits The pair of linear slits extend from the outer peripheral end of the flange to the arc-shaped slit in the radial direction, and the extended end portion is formed inside the flange.

According to the fifth aspect, the transmission path between the linear slit and the mounting portion, and the transmission path of the tensile force divided by the linear slit are more turned back than the linear slit. With this, the path length of the communication path can be made longer than that of the request item 4.

The anti-vibration device of the sixth aspect of the present invention is that in the first aspect, the slit is a curved slit, and the curved slit is formed between the outer peripheral portion of the laminated rubber and the mounting portion, and from the The outer peripheral portion of the laminated rubber extends to the outer peripheral end of the flange in the radial direction while avoiding the mounting portion, and extends in the circumferential direction.

According to the sixth aspect, the transmission path of the tensile force is divided by the curved slit formed by the spiral shape from the outer peripheral portion of the laminated rubber to the outer peripheral end of the flange. Thereby, the length of the elongated curve slit can make the path length of the communication path longer than that of the request item 1. In addition, compared with the structure that the transmission path becomes a meander, the freedom of setting the path length can be increased.

A seventh aspect of the present invention is a shockproof device according to the first aspect, the slit is a curved slit, and the curved slit is between a circle connecting a plurality of the mounting portions and the outer peripheral portion of the laminated rubber It is formed to avoid the mounting portion, and extends from the outer peripheral portion of the laminated rubber to the circle in the radial direction and extends in the circumferential direction.

According to the seventh aspect, the transmission path of the tensile force is divided by a curved slit formed in a spiral shape from the outer peripheral portion of the laminated rubber to the circle connecting the mounting portions. Due to the lengthening of the slit of the curve, it can make The path length of the transmission path is longer than that of the request item 1. In addition, compared with the structure that the transmission path becomes a meander, the freedom of setting the path length can be increased.

Since the present invention has the above structure, it can provide an anti-shock device that does not depend on the plastic deformation of the flange and can reduce the tensile force transmitted to the laminated rubber.

10,40,60,74,80,82,90

12,50‧‧‧Layered rubber

14‧‧‧Flange

14A, 42A, 62A, 70A, 76A, 86A, 92A ‧‧‧ lower flange

14B‧‧‧Upper flange

16‧‧‧Mounting hole (mounting part)

20,52,72‧‧‧Communication path

22‧‧‧screw (fixing member)

24‧‧‧slit (circular slit)

26‧‧‧Slit (Linear slit)

28‧‧‧Slit (Linear slit)

30‧‧‧Slit (Linear slit)

38‧‧‧Fan-shaped flange

44‧‧‧Slit (circular slit)

46‧‧‧Slit (straight slit)

48‧‧‧Slit (Linear slit)

56,57‧‧‧Base plate (mounting surface)

64,84‧‧‧slit (curve slit)

L‧‧‧The shortest straight line

FIG. 1(A) is a front view showing the basic structure of the anti-vibration device of the first embodiment of the present invention, and FIG. 1(B) is a cross-sectional view taken along line X-X of FIG. 1(A).

FIG. 2(A) is a perspective view showing the basic structure of the anti-vibration device according to the first embodiment of the present invention, and FIG. 2(B) is a perspective view showing the basic configuration of the conventional anti-vibration device.

Fig. 3(A) is a front view of the anti-vibration device under the conditions for calculating the vertical deformation, FIG. 3(B) is a table summarizing the coefficients used for numerical calculation, and FIG. 3(C) is a characteristic diagram showing the vertical deformation-vertical load characteristics .

4 is a plan view showing an example of the distribution of von Mises stress in the anti-shock device according to the first embodiment of the present invention.

FIG. 5(A) is a perspective view showing the amount of deformation obtained by numerical calculation of the anti-shock device of the first embodiment of the present invention, and FIG. 5(B) is a front view schematically showing a state of vertical deformation.

6(A) is a plan view showing the shape of the flange slit under the shockproof device of the second embodiment of the invention, and FIG. 6(B) is a view of the flange slit under the shockproof device of the third embodiment of the invention Top view of the shape.

7(A) is a plan view showing the shape of the flange slit under the shockproof device of the fourth embodiment of the present invention, and FIG. 7(B) is a view of the flange slit under the shockproof device of the fifth embodiment of the invention Top view of the shape.

8(A) is a plan view showing the shape of the flange slit under the shockproof device of the sixth embodiment of the invention, and FIG. 8(B) is a view of the flange slit under the shockproof device of the seventh embodiment of the invention Top view of the shape.

(First embodiment)

The anti-vibration device 10 according to the first embodiment will be described using FIGS. 1 to 6.

As shown in FIG. 1(A), the anti-vibration device 10 has a lower flange 14A and an upper flange 14B. The lower flange 14A is fixed to a base plate 56 at a lower base 18 of a building not shown. It is fixed with screws 22 as fixing members. In addition, the upper flange 14B is attached and fixed by screws 22 at the base plate 57 attached to the upper base portion 19 of the building. In addition, the drawings in this specification are described with the direction of arrow UP upward.

The anti-vibration device 10 is a general product that is widely popular in the market. The laminated rubber 12 is disposed at the center portion in the vertical direction, and the lower flange 14A and the upper flange 14B having larger diameters than the laminated rubber 12 are installed on both end surfaces of the laminated rubber 12. The laminated rubber 12 is formed such that a rubber plate 12G and a steel plate 12S having predetermined elasticity are alternately laminated to form a cylindrical shape.

The lower flange 14A and the upper flange 14B, and the base plates 56 and 57 are formed of steel plates in a circular shape in plan view. The lower flange 14A and the upper flange 14B are formed with slits described later. Since the slits of the lower flange 14A and the upper flange 14B have the same structure, the following description will focus on the flange 14A.

FIG. 1(B) shows a top view of the lower flange 14A. The laminated rubber 12 is joined to the center of the flange of the lower flange 14A, and an attachment hole 16 to be an attachment portion is formed on the outer peripheral end side. The screw 22 is omitted from the top view of the lower flange 14A.

The lower flange 14A is provided with a slit 24 as an arc-shaped slit, which reaches from the surface of the lower flange 14A to the inside. In addition, other slits also reach inside from the surface of the lower flange 14A. The slit 24 is formed in an arc shape along the outer peripheral portion of the laminated rubber 12 and intersects with the shortest straight line L connecting the mounting hole 16 and the outer peripheral portion of the laminated rubber 12. In addition, the slit 24 is formed at a position that does not cross the adjacent shortest straight line L.

At one end of the slit 24, a slit 26 as a linear slit is formed in the radial direction. The slit 26 is formed to avoid the mounting hole 16 and maintain a predetermined distance from the mounting hole 16. The other end of the slit 26 reaches the outer peripheral end of the lower flange 14A.

A fan-shaped flange 38 having a so-called fan shape in plan view is formed in the range sandwiched by the slits 24 and 26.

The fan-shaped flange 38 is provided with a slit 26 extending from one end of the slit 24 near the mounting hole 16, so that the distance between the remaining portion of the other end of the slit 24 and the mounting hole 16 can be increased.

As a result, when the tensile force is transmitted from the mounting hole 16 to the build-up rubber 12, the length of the transmission path 20 that becomes the deformed portion in the tensile direction can be increased, and the deformation becomes easier when an external force is received. In addition, the deformation during deformation can be reduced.

Inside the fan-shaped flange 38, there are three slits 28 which are linear slits provided in the radial direction from the slit 24 to the outer peripheral end of the flange 14A. One end of the slit 28 is connected to the slit 24, and the other end of the slit 28 stops inside the lower flange 14A and does not reach the outer peripheral end of the lower flange 14A.

In addition, the three slits 30 which are linear slits are provided in the radial direction from the outer peripheral end of the lower flange 14A toward the slit 24. One end of the slit 30 is open at the outer peripheral end of the flange of the lower flange 14A, and the other end of the slit 30 is stopped inside the lower flange 14A and does not reach the slit 24. The slit 28 and the slit 30 are arranged alternately. In addition, setting the number of slits 28 and 30 to three is only an example, and it may be more or less than three.

As a result, at the lower flange 14A, the tensile force detours through the slits 24, 26, 28, and 30 and is transmitted from the mounting hole 16 to the build-up rubber 12. That is, the tensile force is transmitted by the transmission path 20 shown by the broken line.

Specifically, the transmission path 20 is formed by a surplus portion between the slit 26 and the slit 30 at one end, a surplus portion at each of 5 positions between the slit 28 and the slit 30, and the slit 28 and the slit Consist of the cutoff between 26.

That is, the transmission path 20 for the tensile force that detours to the slits 24, 26, 28, and 30 is longer than the shortest straight line L connecting the outer periphery of the laminated rubber 12 and the mounting hole 16. At the same time, since the slits 24, 26, 28, and 30 divide the transmission path of the tensile force, the flange 15A under the slits 24, 26, 28, and 30 is not formed (see FIG. 2(B)) Can reduce the cross-sectional area and reduce the rigidity of the tensile force.

According to this configuration, when a tensile force acts on the anti-vibration device 10, the deformation (ie, elastic deformation) of the lower flange 14A becomes easy, and deformation can be generated with a small tensile force. When the lower flange 14A is deformed, the tensile force transmitted to the build-up rubber 12 is reduced. In addition, since the transmission path 20 of the tensile force of the lower flange 14A becomes longer, the deformation occurring in the transmission path 20 becomes smaller, and the tensile force acting on the build-up rubber 12 can be reduced without relying on plastic deformation.

In addition, although slits are formed in the lower flange 14A and the upper flange 14B, when a lateral force acts on the anti-vibration device 10, the lower flange 14A and the upper flange 14B are restricted to the laminated rubber 12 and the base plate The relative displacement between the mounting surfaces of 56 and 57. As a result, the laminated rubber 12 undergoes shear deformation.

In addition, since the linear slit 26 extending from one end of the slit 24 reaches the outer peripheral end of the lower flange 14A, the tensile force transmitted toward the lower flange 14A and the starting point of the transmission path 20 become the arc-shaped slit. The remaining portion at the other end is between the adjacent slit 24.

This allows relative displacement between the laminated rubber 12 and the lower flange 14A when a tensile force is received. In addition, the deformation of the transmission path 20 can be reduced.

At this time, if the deformation of the transmission path 20 is set within the elastic range of the lower flange 14A, the lower flange 14A can reduce the tensile force transmitted to the build-up rubber 12 without relying on plastic deformation. Thereby, the lower flange 14A can be used repeatedly.

In addition, the drawing shows that the slit width is wider than the slits 24 and 26 than the slits 28 and 30. As shown in the figure, the width of the slits 24 and 26 may be wider than the width of the slits 28 and 30, or they may all have the same width.

In addition, although the configuration in which the lower flange 14A and the upper flange 14B are fixed to the base plates 56 and 57 is described, as long as the joint position with respect to the lower flange 14A and the upper flange 14B can be secured, the base plate 56 and the 57 may not be composed of a flat plate.

Here, the vertical deformation generated in the flange will be described using FIGS. 2 to 5.

The vertical deformation system is obtained by the finite element method (FEM). The calculation mode and calculation conditions used for the analysis are shown in Fig. 2(A), Fig. 2(B), Fig. 3(A), and Fig. 3(B).

2(A) is a perspective view of the anti-vibration device 10 of the present embodiment, and the above-mentioned slits 24, 26, 28, and 30 are provided on the lower flange 14A and the upper flange 14B of the anti-vibration device 10. On the other hand, FIG. 2(B) is a perspective view of the conventional anti-vibration device 11 calculated under the same conditions for comparison purposes, and no slit is formed in the lower flange 15A and the upper flange 15B.

In the calculation, meshes are provided on the lower flange 14A and the upper flange 14B of the anti-vibration device 10, and the lower flange 15A and the upper flange 15B of the anti-vibration device 11 in the radial and circumferential directions, respectively. Deformed.

First, the steel plate 12S, the lower flange 14A, and the fixing screw 22 constituting the laminated rubber 12 constituting the anti-vibration devices 10 and 11 are all completely elastic, the Young's modulus is set at 205GPPa, and the Poisson's ratio is set at 0.3.

As shown in FIG. 3(A), the urging conditions of the anti-vibration devices 10 and 11 are as shown in FIG. Apply tensile force Pv.

In addition, the rubber sheet 12G of the laminated rubber 12 is expressed by the following equations (1) to (5), and is assumed to be a superelastic body that allows large deformation.

W=W _dev +W _vol ...(1)

W _dev =a(I ₁ -3)+b(I ₁ -3) ³ ... (2)

W _vol =0.5k ₁ (J-1) ² (J-1≦0)...(3)

W _vol =0.5k ₂ (J-1) ² (J-1≦ε ₁ )...(4)

W _vol =0.5k ₃ (J-1) ² +ε ₁ (k2-k3)(J-1)-0.5(k ₂ -k ₃ )ε ₁ ² (ε ₁ <J-1)...(5 )

Here, each symbol is shown as follows.

W: Volume of rubber sheet (MPa)

W _dev : deformation other than volume deformation of rubber sheet (MPa)

W _vol : volume deformation of rubber sheet (MPa)

a: Material constant (MPa)

b: Material constant (MPa)

I ₁ : amount of deformation (invariant of deformation) (-)

k ₁ , k ₂ , k ₃ : constant (MPa)

ε ₁ : volumetric deformation (-)

J: Volumetric deformation (invariant of deformation) (-)

The values of a, b, k ₁ , k ₂ , k ₃ , and ε _{1 are} shown in the table of FIG. 3(B).

One of the calculation results is shown in FIG. 3(C) and FIG. 4, for example.

Figure 3(C) shows the relationship between vertical deformation ε and vertical load σ.

The characteristic Q1 shown by the broken line is the characteristic curve of the conventional anti-vibration device 11, and the characteristic Q2 shown by the solid line is the characteristic curve of the anti-vibration device 10 of the embodiment.

In order to generate the vertical load required for the same vertical deformation, for example, when the vertical deformation ε is 0.2, the vertical load σ in the characteristic Q1 becomes 1.7 MPa. On the other hand, the vertical load σ of the characteristic Q2 becomes 0.3 MPa. That is, since the anti-vibration device 10 is provided with slits in the lower flange 14A and the upper flange 14B, the deformation of the lower flange 14A and the upper flange 14B becomes easy, and the tensile force acting on the build-up rubber 12 can be reduced.

Figure 4 shows the von Mises stress when the vertical deformation is 10%. The von Mises stress is an index that is widely used as a benchmark for plastic deformation-related forces. The larger the value, the greater the degree of plastic deformation. In FIG. 4, the dark-colored part represents the part where von Mises stress is large.

In this embodiment, the von Mises stress value shows a tendency to be higher on the side of the flange center of the transmission path 20 and lower on the side of the mounting hole 16. Specifically, the maximum value of a portion where there is a portion between the slit 26 and the slit 28 close to the central portion of the flange and between the slit 28 and the slit 30 exceeds 300 MPa.

In addition, the reason why the von Mises stress value varies with the position of the lower flange 14A is that, as shown in FIG. 3(A), the lateral load Ph is applied to the anti-vibration device 10, and 100% is applied in the lateral direction The difference caused by applying tensile force Pv to the upward direction in the state of offset shear deformation.

From this result, it can be seen that if the material of the lower flange 14A is selected, such as SM490, which can elastically deform until the maximum value of the von Mises stress exceeds 300 MPa, the transmission path 20 can be deformed without relying on plastic deformation.

FIG. 5(A) is a perspective view showing the deformation of the lower flange 14A and the upper flange 14B when the vertical deformation is 50%, and FIG. 5(B) is a schematic view before the deformation.

When the tensile force acts on the anti-vibration device 10, the transmission path 20 divided into a rectangular shape by the slits 24, 26, 28, and 30 is deformed in the tensile direction. By deforming the lower flange 14A and the upper flange 14B, the tensile force transmitted to the build-up rubber 12 can be reduced. In addition, if the deformation amounts of the lower flange 14A and the upper flange 14B fall within the elastic range, the lower flange 14A and the upper flange 14B can be repeatedly deformed.

As described above, according to the present embodiment, by appropriately setting the slits 24, 26, 28, and 30, when a tensile force acts on the anti-vibration device 10, the lower flange 14A can be easily deformed. As a result, the tensile force transmitted to the laminated rubber 12 can be reduced.

In addition, in the present embodiment, the slit shape of the lower flange 14A is mainly described, but the upper flange 14B has the same configuration. By allowing the lower flange 14A and the upper flange 14B to share the amount of deformation, the amount of deformation of the transmission path 20 can be reduced.

In addition, when the outer diameters of the lower flange 14A and the upper flange 14B are small and the necessary length of the transmission path 20 cannot be sufficiently secured, the outer diameter may be increased to ensure the necessary length of the transmission path 20.

(Second embodiment)

The anti-vibration device 74 of the second embodiment will be described with reference to FIG. 6(A).

The shockproof device 74 has a lower flange 70A, and the lower flange 70A is not provided with slits 28, 30 in that it is different from the lower flange 14A described in the first embodiment. Focus on the differences.

As shown in FIG. 6(A), the lower flange 70A is provided with an arc-shaped slit 24 and a slit 26 extending radially from the end of the slit 24 to reach the outer peripheral surface of the lower flange 70A. The slit 24 and the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16 intersect at least one place, and a so-called fan-like shape in plan view is formed within the range sandwiched by the slits 24 and 26 Sector flange 38.

The fan-shaped flange 38 is provided with a slit 26 extending from one end of the slit 24 near the mounting hole 16. Thereby, the transmission path 72 of the tensile force between the outer peripheral portion of the laminated rubber 12 and the mounting hole 16 can be increased. That is, the transmission path 72 for transmitting the tensile force from the mounting hole 16 to the build-up rubber 12 and the slit 24 and the slit 26 can each be one side and become substantially triangular oblique sides.

As a result, the transmission path 72 can be made longer than the case without the slit 26 (for example, the third embodiment described later).

(Third Embodiment)

The shockproof device 82 of the third embodiment will be described with reference to FIG. 6(B).

The shockproof device 82 has a lower flange 76A, and the lower flange 76A is not provided with slits 26, 28, and 30, and only the slit 24 is formed, which is different from the flange 14A described in the first embodiment. Focus on the differences.

As shown in FIG. 6(B), only the slit 24 is formed in the lower flange 76A.

The slit 24 intersects the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16 at at least one location.

As a result, when the tensile force acts on the anti-vibration device 10, the tensile force is transmitted between the mounting hole 16 and the build-up rubber 12 through the transmission path 78 that avoids the slit 24 of the lower flange 76A. That is, since the slit 24 is formed on the shortest straight line L connecting the outer periphery of the laminated rubber 12 and the mounting hole 16, the transmission path 78 of the tensile force will be less than the outer periphery of the laminated rubber 12 and the mounting hole 16 The shortest straight line L to be connected is long.

As a result, compared with the case where the shortest straight line L is the transmission path, the deformation of the transmission path 78 becomes easier, and the tensile force transmitted to the build-up rubber 12 can be reduced.

(Fourth embodiment)

The shockproof device 40 according to the fourth embodiment will be described with reference to FIG. 7(A).

As shown in FIG. 7(A), the shape of the slit formed in the lower flange 42A of the anti-vibration device 40 is different from the shape of the slit of the flange 14A in the first embodiment. Focus on the differences.

The lower flange 42A is formed in a circular arc shape along the outer circumferential portion of the laminated rubber 12 provided in the central portion of the flange so as to form an arc-shaped slit 44. The slit 44 is formed at a position where the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16 intersects. In addition, the slit 44 does not cross the shortest straight line L connecting the outer peripheral portion of the adjacent laminated rubber 12 and the mounting hole 16. A slit is formed between the slit 44 and the adjacent slit 44.

A pair of slits 46 forming a pair of linear slits are provided from the both ends of the slit 44 to the flange outer peripheral end 42E of the flange 42A. The slit 46 is formed in the radial direction while sandwiching the mounting hole 16. The end of the slit 46 is anchored inside the lower flange 42A, and does not reach the outer peripheral end 42E of the flange.

In addition, a pair of slits 48 that are a pair of linear slits are provided from the flange outer peripheral end 42E to the slit 44. The slit 48 is provided between the mounting hole 16 and the slit 46, and the front end stops inside the lower flange 42A, and does not reach the slit 44. In the lower flange 42A, two transmission paths 54A, 54B indicated by dotted lines between the slits 46, 48 and the slit 48 and the mounting hole 16 are formed.

With the configuration of this embodiment, when a tensile force acts on the anti-vibration device 40, plastic deformation does not occur, the transmission paths 54A and 54B are easily deformed, and the tensile force transmitted to the build-up rubber 12 can be reduced. The other configuration is the same as that of the first embodiment, and the description is omitted.

(Fifth Embodiment)

The anti-vibration device 80 of the fifth embodiment will be described with reference to FIG. 7(B).

The shockproof device 80 has a lower flange 86A, and the lower flange 86A is not provided with a slit 48 in that it is different from the flange 42A described in the fourth embodiment. Focus on the differences.

As shown in FIG. 7(B), in this embodiment, the flange 86A has an arc-shaped slit 44 formed along the outer peripheral portion of the laminated rubber 12 and crossing the shortest straight line L. In addition, a pair of slits 46 extending in the radial direction are formed to avoid the mounting holes 16 from both ends of the slit 44. The end of the slit 46 is stopped inside the lower flange 86A.

According to the present embodiment, the transmission path 94 of the tensile force indicated by the broken line is formed by winding back from the both sides of the slit 44 along the slit 46 to the outer peripheral end of the lower flange 80A. As a result, the path length of the communication path 94 is longer than that of the slit 44 alone. In addition, the transmission path 94 becomes two paths including the mounting hole 16, and the balance is optimally arranged, so that the lower flange 86A can be deformed in a balanced manner. The other configuration is the same as that of the fourth embodiment, and the description is omitted.

(Sixth embodiment)

The anti-vibration device 60 of the third embodiment will be described with reference to FIG. 8(A).

As shown in FIG. 8(A), the shape of the slit 64 formed in the lower flange 62A of the anti-vibration device 60 is different from the first embodiment. Focus on the differences.

In the lower flange 62A, one end of the slit 64 is arranged along the outer peripheral portion of the build-up rubber 12 provided in the central portion of the flange. The slit 64 is formed from the imaginary circle 68 along the outer peripheral portion of the laminated rubber 12 in a smooth spiral curve to the flange outer peripheral end 62E of the lower flange 62A.

The slit 64 is formed between the outer peripheral portion of the laminated rubber 12 and the mounting hole 16, and is formed from the outer peripheral portion of the laminated rubber 12 to the outer peripheral end of the lower flange 62A. In addition, the slit 64 avoids the mounting hole 16 and extends in the radial direction and extends in the circumferential direction to form a spiral-shaped curved slit. In addition, the slit 64 and the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16 intersect.

The plural slits 64 are all inclined in the same direction, and the whole is formed in a spiral shape. Between the slits 64, the tensile force acting on the anti-vibration device 60 is transmitted from the mounting hole 16 to the laminated rubber 12 at the center of the flange to form a transmission path 66.

According to this configuration, the transmission path 66 can be made longer than the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16. In addition, uniform deformation can occur in the transmission path 66. In addition, the cross-sectional area and path length of the communication path 66 can be easily adjusted. As a result, when the tensile force acts When the anti-vibration device 60 is used, the tensile force transmitted to the laminated rubber 12 can be reduced without relying on plastic deformation.

The other configuration is the same as in the first embodiment, and the description is omitted.

(Seventh embodiment)

The shockproof device 90 according to the fourth embodiment will be described with reference to FIG. 8(B).

As shown in FIG. 8(B), the shape of the slit 84 formed in the lower flange 92A of the anti-vibration device 90 is different from the first embodiment. Focus on the differences.

The slit 84 is formed between the imaginary circle 88 connecting the plurality of mounting holes 16 and the imaginary circle 68 along the outer periphery of the laminated rubber 12 so as to avoid the mounting hole 16. In addition, the slit 84 is a spiral-shaped curved slit that extends radially from the outer peripheral portion of the laminated rubber 12 and extends in the circumferential direction to the virtual circle 88. The slit 84 intersects the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16.

The plural slits 84 are all inclined in the same direction, and the whole is formed in a spiral shape. A transmission path 86 for transmitting the tensile force acting on the anti-vibration device 90 from the mounting hole 16 to the build-up rubber 12 is formed between the slits 84.

In addition, the end of the slit 84 provided at the position of the imaginary circle 88 is preferably arranged at the middle position of the two mounting holes 16 so as not to overlap with the mounting hole 16.

According to this configuration, the transmission path 66 can be made longer than the shortest straight line L connecting the outer peripheral portion of the laminated rubber 12 and the mounting hole 16. In addition, uniform deformation can occur in the transmission path 86. In addition, the cross-sectional area and path length of the communication path 86 can be easily adjusted. As a result, when a tensile force acts on the anti-vibration device 80, no plastic deformation occurs, and the tensile force transmitted to the build-up rubber 12 can be reduced.

The other configuration is the same as in the first embodiment, and the description is omitted.

10‧‧‧Shockproof device

12‧‧‧Laminated rubber

12G‧‧‧rubber sheet

12S‧‧‧Steel plate

14A‧‧‧Lower flange

14B‧‧‧Upper flange

16‧‧‧Mounting hole (mounting part)

18‧‧‧Lower foundation

19‧‧‧Upper Foundation

20‧‧‧ Communication Path

22‧‧‧screw

24, 26, 28, 30 ‧‧‧ slit

38‧‧‧Fan-shaped flange

56,57‧‧‧Base plate (mounting surface)

L‧‧‧The shortest straight line

Claims (8)

An anti-vibration device comprising: a laminated rubber; and a flange provided on both end surfaces of the laminated rubber, formed with: a mounting portion fixed to a mounting surface with a fixing member; and, the outer peripheral portion of the laminated rubber and the The shortest straight line connecting the mounting portion makes a slit that intersects at at least one; the flange is formed with a linear slit that extends from the end of the slit to the radial direction to the outer peripheral end of the flange, avoiding the mounting portion . As in the shockproof device of claim 1, the fan-shaped flange sandwiched between the slit and the linear slit forms a linear slit, and the linear slit is from the slit side and the flange The outer peripheral end side alternately extends in the radial direction, and the extended end is stopped inside the flange. As in the shockproof device of claim 1 or 2, the slit is an arc-shaped slit formed along the outer periphery of the laminated rubber. An anti-vibration device comprising: a laminated rubber; and a flange provided on both end surfaces of the laminated rubber, formed with: a mounting portion fixed to a mounting surface with a fixing member; and, the outer peripheral portion of the laminated rubber and the The shortest straight line connecting the mounting part is a slit that intersects at least at one place; the flange is formed with a pair of linear slits, which extend away from the mounting part at both ends of the slit and extend in the radial direction, the end It is tied inside the flange. An anti-vibration device comprising: a laminated rubber; and a flange provided on both end surfaces of the laminated rubber, formed with: a mounting portion fixed to a mounting surface with a fixing member; and, the outer peripheral portion of the laminated rubber and the The shortest straight line connecting the mounting portion is a slit that intersects at least at one place; the flange is formed with a pair of linear slits that extend away from the mounting portion at both ends of the slit in the radial direction, The end portion is tied inside the flange; and a pair of linear slits are tied between the pair of linear slits and the mounting portion, and the straight The line slits extend from the outer peripheral end of the flange to the slit in the radial direction, and the extended end portion is stopped inside the flange. As in the shockproof device of claim 4 or 5, the slit is an arc-shaped slit formed along the outer periphery of the laminated rubber. An anti-vibration device comprising: a laminated rubber; and a flange provided on both end surfaces of the laminated rubber, formed with: a mounting portion fixed to a mounting surface with a fixing member; and, the outer peripheral portion of the laminated rubber and the The shortest straight line connecting the mounting portion makes a curved slit that intersects at at least one; the curved slit is formed between the outer periphery of the laminated rubber and the mounting portion, and from the outer periphery of the laminated rubber to the flange The outer peripheral end avoids the mounting portion to extend in the radial direction and extend in the circumferential direction. An anti-vibration device comprising: laminated rubber; and flanges provided on both end surfaces of the laminated rubber, formed with: a mounting portion fixed to the mounting surface with a fixing member; and, the outer peripheral portion of the laminated rubber and the The shortest straight line connecting the mounting portions makes a curved slit that intersects at at least one; the curved slit is formed by avoiding the mounting portion between the circle connecting the plural mounting portions and the outer periphery of the laminated rubber, and from The outer peripheral portion of the laminated rubber extends radially to the circle and extends circumferentially.

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