JP2008151337A - Laminated support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and disposable laminated support having great damping force. <P>SOLUTION: In an elastic body hollow portion 28 of a laminated elastic body 16, a plastic fluid material 30 is filled which is formed of an elastoplastic body. Besides, in the plastic fluid material 30, a plurality of granular hard fillers is filled at a predetermined volume filling rate, which is formed of hard materials to be considered rigid to the plastic fluid material 30. 0.001≤Ds/D1≤1/3 is satisfied, where D1 is a representative length when adopting a maximum value for a greater representative length out of two highly frequent maximum values in the distribution of the representative lengths of the hard fillers and Ds is the representative length when adopting the maximum value for the smaller representative length. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laminated support.

  Conventionally, a laminated support in which soft plates such as rubber and hard plates such as metal are alternately laminated has been used as a support for seismic isolation devices. Such laminated supports include, for example, one in which a hollow portion is formed at the center and a metal core is press-fitted therein.

  As this metal core, a lead core having stable damping performance is often used. However, lead requires a large cost for disposal. For this reason, Patent Document 1 proposes a seismic isolation device in which a viscous material and a solid material are sealed in a hollow portion instead of lead, and a gap between the solid materials is filled with the viscous material. Examples of the substance include partition members, columnar bodies, and granular bodies.

Moreover, in patent document 1, although liquid bodies, such as oil, are illustrated as a viscous body combined with a granular hard material, in a long-term use, a hard member will precipitate in a liquid body and a dispersed state will deteriorate. For this reason, the attenuation characteristics partially change, and stable attenuation performance cannot be exhibited. Further, the liquid material is not suitable in that it has a small flow resistance and obtains a large damping force.
Japanese Patent Publication No. 7-84815

  In view of the above facts, an object of the present invention is to obtain a laminated support that can be disposed of at low cost and can exhibit a large damping force.

  In the invention according to claim 1, a laminated elastic body in which rigid plates having rigidity and elastic plates having elasticity are alternately laminated in a predetermined lamination direction, and a hollow portion is formed in the lamination direction; A plastic fluid material made of an elastoplastic material and injected into the hollow portion; and a hard filler material filled in the plastic fluid material, and having a higher frequency in the distribution of the representative length of the hard filler material. Among the representative lengths having two maximum values, 0.001 ≦ Ds / Dl ≦ 1/3 is satisfied, where D1 is the larger length and Ds is the smaller length.

  Therefore, when the laminated support is installed on the supported member, the load of the support member is supported by the laminated elastic body. In particular, since the laminated elastic body is configured by alternately laminating rigid plates and elastic plates, high rigidity for supporting the support member can be obtained.

  A plastic fluid is injected into the hollow portion of the laminated elastic body, and the plastic fluid is filled with a hard filler. As a result, the plastic fluid material contacts not only the inner surface of the hollow part but also the surface of the hard filler, and the contact area is widened, so that the damping characteristic during shear deformation of the laminated elastic body is improved, and the large damping is achieved. Power is obtained. That is, when the laminated elastic body undergoes shear deformation, the hard fillers move with each other. At this time, a large damping force can be obtained by moving (flowing) between the hard fillers. It becomes.

  In particular, in the present invention, since the plastic fluidized material is composed of an elastic-plastic material, the dispersion state of the hard filler is stabilized and precipitation of the hard filler is preferably prevented (preferably not precipitated). By preventing the precipitation of the hard material as described above, the dispersion state of the hard filler in the plastic fluidized material is hardly changed, and the damping characteristic is stabilized. Therefore, a desired damping characteristic can be obtained even if the volume filling rate of the hard filler is lowered.

  In addition, since this laminated support does not use materials such as lead that require high costs, it can be discarded at low cost.

  In addition, in the present invention, of the top two maximum values of the frequency in the distribution of the representative length of the hard filler, the larger representative length is Dl and the smaller maximum is Ds. 0.001 ≦ Ds / Dl ≦ 1 / 3 is satisfied. In this way, by satisfying Ds / Dl ≦ 1/3, it is possible to suppress air entrainment when the plastic fluidizing material and the hard filler are kneaded. That is, since the air content rate of the plastic fluidized material can be reduced, a large damping force can be obtained. From this point of view, there is no lower limit for the value of Ds / Dl, but considering the workability of actual kneading and the like, it is preferable that 0.001 ≦ Ds / Dl.

  The invention according to claim 2 is the laminated support according to claim 1, further satisfying 0.001 ≦ Ds / Dl ≦ 1/4.

  Thus, by satisfying Ds / Dl ≦ 1/4, air entrainment when the plastic fluid material and the hard filler are kneaded can be further suppressed. The content is further reduced, and a greater damping force is obtained.

  In invention of Claim 3, it is a lamination | stacking support body of Claim 1 or Claim 2, Comprising: The minimum value of frequency is carried out between the upper two maximum values in distribution of the representative length of the said hard filler. When the representative length to be taken is Dc, the total volume of large particle groups having a representative length larger than Dc is Vl, and the total volume of small particle groups having a representative length of Dc or less is Vs, 0.4 ≦ Vl / (Vl + Vs) ≦ 0.8 is satisfied.

  As described above, by satisfying 0.4 ≦ Vl / (Vl + Vs) ≦ 0.8, it is possible to suppress the entrainment of air when the plastic fluid material and the hard filler are kneaded. That is, since the air content rate of the plastic fluidized material can be reduced, a large damping force can be obtained.

  The invention according to claim 4 is the laminated support according to claim 3, further satisfying 0.5 ≦ Vl / (Vl + Vs) ≦ 0.7.

  Thus, by satisfying 0.5 ≦ Vl / (Vl + Vs) ≦ 0.7, it is possible to further suppress the entrainment of air when the plastic fluid material and the hard filler are kneaded. In addition, the air content of the plastic fluidized material is further reduced, and a greater damping force can be obtained.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the shear yield stress τy of the plastic fluidized material is 0.1 MPa ≦ τy ≦ 10 MPa. And

  The plastic fluidized material has a greater damping effect as the shear yield stress τy is increased, but if it is too large, filling (mixing) of the hard filler becomes difficult. Conversely, as the shear yield stress τy is reduced, the plastic fluidized material can be greatly plastically deformed, and the filling (mixing) of the hard filler is facilitated, but the damping effect is reduced.

  Therefore, a large damping performance can be obtained by setting the shear yield stress τy of the plastic fluid material to 0.1 MPa or more.

  Further, by setting the shear yield stress τy to 10 MPa or less, the plastic fluidized material can be greatly plastically deformed, and the filling (mixing) of the hard filler is facilitated.

  The invention according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 5, the shape of the hard filler is substantially spherical.

  By making the shape of the hard filler substantially spherical, it becomes possible to eliminate the direction dependency of the hard filler and to exhibit stable damping performance in an arbitrary direction.

  In the invention according to claim 7, a laminated elastic body in which a rigid plate having rigidity and an elastic plate having elasticity are alternately laminated in a predetermined lamination direction, and a hollow portion is formed in the lamination direction; A plastic fluid material made of a non-curing type elastic perfect plastic material and injected into the hollow portion; and a hard filler material filled in the plastic fluid material, and having a representative length of the hard filler material. Of the representative lengths having the two largest local maximum values in the distribution, the larger one is Dl and the smaller one is Ds, and 0.001 ≦ Ds / Dl ≦ 1/3 is satisfied. The representative length that takes the minimum frequency between the top two maximum values in the length distribution is Dc, the total volume of large particles having a representative length larger than Dc is Vl, and the representative length is Dc or less. When the total volume of the small particles is Vs, 0.4 ≦ Vl / (Vl Characterized in that it satisfies the Vs) ≦ 0.8.

  Therefore, when the laminated support is installed on the supported member, the load of the support member is supported by the laminated elastic body. In particular, since the laminated elastic body is configured by alternately laminating rigid plates and elastic plates, high rigidity for supporting the support member can be obtained.

  A plastic fluid is injected into the hollow portion of the laminated elastic body, and the plastic fluid is filled with a hard filler. As a result, the plastic fluid material contacts not only the inner surface of the hollow part but also the surface of the hard filler, and the contact area is widened, so that the damping characteristic during shear deformation of the laminated elastic body is improved, and the large damping is achieved. Power is obtained. That is, when the laminated elastic body undergoes shear deformation, the hard fillers move with each other. At this time, a large damping force can be obtained by moving (flowing) between the hard fillers. It becomes.

  In particular, in the present invention, the plastic fluidized material is composed of a non-curing elastic perfect plastic material, so that the dispersion state of the hard filler is stabilized and precipitation of the hard filler is prevented (preferably not precipitated). ). By preventing the precipitation of the hard material as described above, the dispersion state of the hard filler in the plastic fluidized material is hardly changed, and the damping characteristic is stabilized. Therefore, a desired damping characteristic can be obtained even if the volume filling rate of the hard filler is lowered.

  In addition, since this laminated support does not use materials such as lead that require high costs, it can be discarded at low cost.

  In addition, in the present invention, of the top two maximum values of the frequency in the distribution of the representative length of the hard filler, the larger representative length is Dl and the smaller maximum is Ds. 0.001 ≦ Ds / Dl ≦ 1 / 3 is satisfied. In this way, by satisfying Ds / Dl ≦ 1/3, it is possible to suppress air entrainment when the plastic fluidizing material and the hard filler are kneaded. That is, since the air content rate of the plastic fluidized material can be reduced, a large damping force can be obtained. From this point of view, there is no lower limit for the value of Ds / Dl, but considering the workability of actual kneading and the like, it is preferable that 0.001 ≦ Ds / Dl.

  Further, in the present invention, the representative length that takes the minimum frequency between the top two maximum values in the distribution of the representative length of the hard filler is Dc, and the entire large particle group having a representative length larger than Dc is Dc. When the product is Vl and the total volume of the small particle group having a representative length of Dc or less is Vs, 0.4 ≦ Vl / (Vl + Vs) ≦ 0.8 is satisfied. As described above, by satisfying 0.4 ≦ Vl / (Vl + Vs) ≦ 0.8, it is possible to suppress the entrainment of air when the plastic fluid material and the hard filler are kneaded. That is, since the air content rate of the plastic fluidized material can be reduced, a large damping force can be obtained.

  Since the present invention has the above-described configuration, it can be discarded at a low cost and can exhibit a large damping force.

  FIG. 1 shows a laminated support 12 according to a first embodiment of the present invention. The laminated support 12 is a laminated elastic material in which a plurality of disk-shaped metal plates 18 and a plurality of disk-shaped rubber plates 20 are alternately laminated in the thickness direction (hereinafter, this lamination direction is referred to as “X direction”). A body 16 is provided.

  Flange plates 14 are fixed to both end surfaces of the laminated elastic body 16 in the X direction. The flange plate 14 includes a flange portion 14F that protrudes to the side of the laminated elastic body 16, and a bolt is inserted into a bolt hole (not shown) formed in the flange portion 14F so that the laminated support body 12 is supported. It is attached to members (for example, building foundations, foundations, grounds, etc.) and supported members (for example, office buildings, hospitals, apartment houses, museums, public halls, schools, government buildings, shrines and temples, bridges, etc.). In the attached state, the supported member is supported by the support member via the laminated support 12.

  The metal plate 18 and the rubber plate 20 constituting the laminated elastic body 16 are firmly bonded to each other by vulcanization adhesion (or by an adhesive), so that they are not inadvertently separated or misaligned. Yes. When the laminated support body 12 receives a horizontal shearing force, the laminated elastic body 16 is also elastically sheared.

  Accordingly, when the supporting member and the supported member are relatively moved (vibrated) in the horizontal direction, the laminated elastic body 16 is elastically sheared and deformed as a whole. Here, as described above, by alternately laminating the metal plates 18 and the rubber plates 20, even when a load acts in the laminating direction, the elastic deformation of the laminated elastic body 16 (that is, compression of the rubber plates 20) occurs. It is suppressed.

  The laminated elastic body 16 further includes a covering material 22 that covers the outer end faces of the metal plate 18 and the rubber plate 20 from the periphery. The coating material 22 prevents rain and light from acting on the metal plate 18 and the rubber plate 20 from the outside, thereby preventing deterioration due to oxygen, ozone, ultraviolet rays, or the like. Further, the covering material 22 has a constant thickness so that there is no variation in its strength. The covering material 22 can be formed of the same material as the rubber plate 20. In this case, the rubber plate 20 and the covering material 22 can be formed separately and integrated by vulcanization adhesion or the like in a subsequent process. Alternatively, the covering material 22 and the rubber plate 20 may be bonded with an adhesive or the like.

  An elastic hollow portion 28 that penetrates the laminated elastic body 16 in the X direction is formed at the center of the laminated elastic body 16. The elastic hollow portion 28 is a cylindrical space in the present embodiment, but the shape is not limited to a cylindrical shape.

  The elastic body hollow portion 28 accommodates a plug 29 having a plastic fluid 30 made of an elasto-plastic material and a hard filler (spherical body 32) filled in the plastic fluid 30. As shown schematically in FIG. 5 (A), this elastic-plastic body exhibits an elastic behavior in which shear stress and shear strain are proportional to a certain yield point. Refers to a material that exhibits plastic behavior such that is constant.

  In addition, the graph shown to this FIG. 5 (A) modeled the behavior of the plastic fluid material 30 to the last. Therefore, the shear stress is exactly proportional to the shear strain up to the yield point, and after the yield point, the shear stress is completely constant. In other words, when the yield point is exceeded, the plastic fluidized material is not cured (non-hardened). A material exhibiting such a behavior is particularly called an elastic perfect plastic body, and has the most preferable characteristics as the plastic fluidized material 30 of the present invention. However, the present invention can be applied to the present invention even if the material does not actually exhibit such behavior. In short, it is only necessary to show a behavior in which the shear strain increases when the yield point is reached, because the shear stress slightly increases (or does not increase at all). Considering the graph of FIG. 5 (A), the slope of the straight line (or curve) may be relatively steep until the yield point is reached, and the slope may be gentle when the yield point is exceeded. For example, even if the shear stress increases monotonically with respect to the shear strain in the state beyond the yield point, the degree of the increase, that is, the slope of the straight line (or curve) on the right side of the yield point is greater than the left side of the yield point. If it is small, the plastic fluid material 30 exhibits an elastic behavior until the yield point is reached, and if it exceeds the yield point, the plastic fluid material 30 exhibits a plastic behavior, so that it can be applied as the plastic fluid material 30 of the present invention. Become.

  In an actual material, for example, as shown in FIG. 5B, the shear stress may change from increasing to decreasing, and in this case, the shear stress at the maximum value is said to be the upper yield point. Furthermore, as shown in FIG. 5C, the shear stress may change from decreasing to increasing in a state exceeding the upper yield point, and in this case, the shear stress at the minimum value is referred to as a lower yield point. Thus, a material having an upper yield point or a lower yield point may be used. In the material as shown in FIG. 5B or 5C, the upper yield point is the shear yield stress τy.

  Examples of the plastic fluid material 30 include, but are not limited to, unvulcanized rubber and thermoplastic elastomer. Examples of the main component (polymer) of the unvulcanized rubber include natural rubber (NR), styrene / butadiene rubber (SBR), styrene / propylene rubber (EPM, EPDM), and silicone rubber (Q). Further, a compounding agent such as carbon black, calcium carbonate, oil or resin may be blended with unvulcanized rubber or thermoplastic elastomer. In particular, unvulcanized rubber is preferable because it is easily available and can be constructed at low cost.

  Further, in the elastic body hollow portion 28, that is, in the plastic fluid material 30, a spherical spherical body 32 made of a hard material that can be regarded as a rigid body with respect to the plastic fluid material 30 has a predetermined volume filling rate. A plurality are filled. The “volume filling rate” is a percentage of the volume of the spherical body 32 to the sum of the volume of the plastic fluid 30 and the volume of the spherical body 32.

  The spherical body 30 is an example of the hard filler of the present invention, but the material of the hard filler may be a material having a hardness that can be regarded as a rigid body with respect to the plastic fluid material 30. For example, metals, ceramics, engineering plastics, and the like can be applied, but are not limited thereto. Specific examples of the metal include pure iron, and powder mainly composed of iron such as carbon steel and stainless steel. In particular, iron is preferable because it is relatively high compared to other metals, and thus temperature rise is suppressed and initial characteristics can be maintained.

  Here, in this embodiment, the spherical body 32 which consists of two types of particle groups shape | molded so that a magnitude | size may be used as the spherical body 32. FIG. In FIG. 7, the number distribution (frequency distribution) for each representative length of the spherical body 32 is shown as particle groups A and B. As used herein, “representative length” is measured in a certain direction with respect to the observation surface (projection surface) of the hard filler 51 obtained using a magnifying glass (such as a microscope or a microscope). The maximum distance (Feret diameter). In the example shown in FIG. 6, the representative length D is measured by picking up the irregular hard filler 51, but the shape of the hard filler of the present invention is not limited to this. The representative length D can be measured in the same manner for any of the hard fillers 4 (A) to (F). In particular, in a hard filler having a spherical shape like the spherical body 32 of the present embodiment, the representative length D matches the diameter.

  As can be seen from FIG. 7, in each of the particle groups A and B, the frequency distribution is a so-called single mountain type, that is, a distribution in which one maximum value exists. Then, by mixing the two particle groups A and B having different maximum values, as a whole, as shown in FIG. 8, a so-called double mountain type, that is, a frequency distribution having two maximum values.

  In this embodiment, in such a frequency distribution, the representative length when taking the maximum value of the larger representative length (right side in the graph of FIG. 8) of the two maximum values of the frequency is Dl, and the representative length The representative length when taking the maximum value of the smaller one (left side in the graph of FIG. 8) is Ds.

  Further, the representative length when the frequency is minimum between these two maximum values is Dc, and all of the spherical bodies 30 (large particle group) having a diameter (representative length) larger than this Dc. The total product of all spherical bodies 32 (small particle groups) having a diameter (representative length) of Vl and Dc or less is Vs.

  The above definitions of Dl, Ds, and Dc can be applied without being limited to the so-called double mountain type frequency distribution shown in FIG. For example, in the frequency distributions shown in FIGS. 9 to 11, there are three local maximum values. However, even in such a frequency distribution, the representative length when the top two of the maximum values are taken is extracted, and among these, the larger representative length is Dl and the smaller representative length is Ds. do it. In particular, in the frequency distribution shown in FIG. 11, there are a plurality (two) of minimum points between two maximum values, but the representative length when taking the minimum value may be Dc.

In this embodiment, the above Dl and Ds are used.
0.001 ≦ Ds / Dl ≦ 1/3
The size of the spherical body 30 is set so as to satisfy the above.

In the present embodiment, the above-described Vl and Vs are used.
0.4 ≦ Vl / (Vl + Vs) ≦ 0.8
The size of the spherical body 30 and the distribution of the particle groups A and B are set so as to satisfy the above.

  A closing plate 24 is disposed at the end of the elastic hollow portion 28. The closing plate 24 is formed in a disk shape having a larger diameter than the elastic body hollow portion 28 so that the end of the elastic body hollow portion 28 in the X direction can be closed. By fixing the closing plate 24 to the flange plate 14, the elastic body hollow portion 28 can be sealed.

  In the laminated support body 12 of the first embodiment having such a configuration, the laminated elastic body 16 is shown in FIG. 2A by relative movement (vibration) between the support member and the supported member in the horizontal direction. Is elastically sheared. At this time, as shown also in FIG. 2B, the plastic fluid 30 in the elastic body hollow portion 28 also undergoes shear deformation as a whole and absorbs energy. In this embodiment, since the spherical body 32 is filled in the plastic fluid material 30, the plastic fluid material 30 contacts not only the inner surface of the elastic hollow portion 28 but also the surface of the spherical body 32, and the contact area thereof. The plastic fluidized material 30 is difficult to flow due to the interposition of the spherical body 32. For this reason, the damping characteristic at the time of shear deformation of the laminated elastic body 16 is improved, and a larger damping force can be exhibited to absorb energy.

  In FIG. 3A, the laminated elastic body of the comparative example having the same configuration, except that the spherical body 32 (hard filler) as in the present embodiment is not filled, enlarges only the portion of the plastic fluid material 30. It is shown as In the laminated elastic body of the comparative example, the plastic fluid 30 is in contact only with the inner surface of the elastic body hollow portion 28. Therefore, assuming a rectangular parallelepiped region E1 in the cross section before deformation as shown in FIG. 3A, for example, this region E1 is simply sheared as shown in FIG. There is. On the other hand, in the present embodiment, the spherical body 32 (hard filler) moves and the plastic fluid 30 also moves (flows) in the narrow gap between the spherical bodies 32 (hard filler), so that a large damping force is generated. can get.

  In particular, in this embodiment, since the plastic fluid material 30 is composed of an elastic perfect plastic material (non-hardened elastic plastic material), the dispersion state of the filled spherical bodies 32 (hard filler) is stabilized. That is, the spherical bodies 32 are uniformly distributed in the plastic fluidized material 30 without inadvertent precipitation or uneven distribution. For this reason, the damping characteristic of the plastic fluidized material 30 does not change partially, and stable damping performance can be exhibited.

  Moreover, in this embodiment, in order to obtain a desired damping force in this way, a lead member such as a conventional lead plug is not required. For this reason, it becomes possible to dispose at low cost.

In addition, in this embodiment, Dl and Ds shown in FIG.
Ds / Dl ≦ 1/3
The size of the hard filler (spherical body 32) is set so as to satisfy the above. Regarding Vl and Vs,
0.4 ≦ Vl / (Vl + Vs) ≦ 0.8
The size of the hard filler and the distribution of the particle groups A and B are set so as to satisfy the above. By these, compared with the structure which does not satisfy | fill these conditions, the entrainment of the air when kneading the plastic fluidity material 30 and the hard filler can be suppressed. Since the air content rate of the plastic fluidized material 30 can be reduced, a large damping force can be obtained.

FIG. 12 shows the value of Ds / Dl and the air content ε when the ratio of the particle group size is changed under the following conditions for the two types of particle groups A and B according to the present embodiment. The relationship is shown.
・ Outer diameter of plug 29: 45 mm
・ Height of plug 29: 90 mm (calculated value when air content is 0%)
-Molding pressure of plug 29: 100 MPa
-Composition of plastic fluid 30: unvulcanized rubber
Formulation (wt%): natural rubber 13%, butadiene rubber 31%,
36% carbon, 18% resin,
Other oil 2%
・ Composition of hard filler: iron powder consisting of two-component particles with irregular shape ・ Volume filling ratio of hard filler: 70%
-Volume ratio of hard filler: Vl / (Vl + Vs) = 0.7 (constant value)
Then, four values of Ds / Dl were set by combining Ds and Dl as shown in Table 1 below.

なお、空気含有率は、（１−プラグの比重÷プラグの構成材料の計算比重）×１００で計算できる。ここで、プラグ２９の比重は、塑性流動材の比重×体積比＋硬質充填材の比重×体積比である。

The air content can be calculated by (1-specific gravity of plug / calculated specific gravity of the constituent material of the plug) × 100. Here, the specific gravity of the plug 29 is the specific gravity × volume ratio of the plastic fluid material + the specific gravity × volume ratio of the hard filler.

  From this graph, it can be seen that the air content ε decreases as the value of Ds / Dl decreases.

  Next, the relationship between the air content ε and the hardness of the plastic fluid 30 will be described. In general, the hardness tends to decrease as the air content ε of the plastic fluid 30 increases.

In FIG. 14, as shown below, the specimens filled with (mixed with) the hard filler in the plastic fluid material as in the present embodiment are molded with different air contents by changing the molding pressure. And the result of having performed the test which calculates | requires the relationship between the air content rate of a test body and durometer hardness (type D) is shown. This test was performed by the method prescribed in JIS K6253. The configuration of the test specimen is as follows.
-Shape of the test specimen: columnar-Outer diameter of the test specimen: 10 mm
-Length of specimen: 10 mm
-Composition of plastic fluid of test specimen: Unvulcanized rubber
Formulation (wt%): natural rubber 13%, butadiene rubber 31%,
36% carbon, 18% resin,
Other oil 2%
・ Structure of hard filler: iron powder ・ Representative length of hard filler: 40 μm
・ Molding pressure: 120-50MPa
As can be seen from the graph of FIG. 14, the durometer hardness (type D) does not decrease when the air content is up to 3%, but decreases when it exceeds 3%. Therefore, in the present invention, the air content of the plastic fluidized material 30 is particularly preferably 3% or less. As a condition for achieving an air content of 3% or less, Ds / Dl ≦ 1/3 is obtained. As a more preferable range, Ds / Dl ≦ 1/4 is obtained as a condition for achieving an air content of 2% or less.

  As can be seen from FIG. 12, there is no particular lower limit for the value of Ds / Dl as a condition for reducing the air content. However, if this value is too small, the spherical bodies 32 constituting the small particle group become small, and handling becomes difficult, for example, the minute spherical bodies 32 are scattered during kneading. Therefore, considering the workability of actual kneading, it is preferable to satisfy 0.001 ≦ Ds / Dl.

  FIG. 13 shows the relationship between Vl / (Vl + Vs) and the air content ε when the volume ratio of the particle groups is changed for the two types of particle groups A and B according to the present embodiment. . In this example, the volume filling rate is 70%, Dl = 0.04 mm, Ds = 0.01 mm, and Ds / Dl = 0.25. Further, four values of 0.3, 0.5, 0.7, and 0.9 are set as the value of Vl / (Vl + Vs).

  From this graph, it can be seen that the air content ε becomes minimum when Vl / (Vl + Vs) is about 0.7, and the air content increases even if this value increases or decreases. As a condition for achieving an air content of 3% or less, 0.4 ≦ Vl / (Vl + Vs) ≦ 0.8 is obtained. As a more preferable range, 0.5 ≦ Vl / (Vl + Vs) ≦ 0.7 is obtained as a condition for achieving an air content of 2% or less.

  In the present embodiment, the spherical body 32 formed in a spherical shape is given as an example of the hard filler of the present invention. In short, the plastic fluid material 30 is brought into contact with the plastic fluid material 30 by being filled in the plastic fluid material 30. Thus, there is no particular limitation as long as the contact area can be increased and the flow resistance of the plastic fluid 30 can be increased. For example, the spheroidal hard filler 36 shown in FIG. 4 (A), the cylindrical hard filler 38 shown in FIG. 4 (B), the disk-like hard filler 39 shown in FIG. Examples thereof include a hard filler 41 having a constricted shape (so-called “peanut shell” shape) in the longitudinal center of the spheroid shown in FIG.

  If the hard filler is spherical as in the present embodiment, the directionality is lost, and stable damping characteristics can be exhibited in any direction. In this case, the “spherical shape” includes a complete spherical shape, but may not be a complete spherical shape as long as it has substantially no direction dependency. For example, a regular polyhedron shape, a hard filler 48 having a surface composed of a pentagon and a hexagon (so-called “soccer ball” shape) as shown in FIG. 4E, or FIG. As shown in the figure, from the surface of the sphere, a plurality of conical (which may be pyramidal, frustum-shaped, or frustum-shaped) microprotrusions are formed so that each apex faces outward ( It may be a so-called “gold flat sugar” shape hard filler 49 or the like. In the case of the regular polyhedron-shaped hard filler 48, the larger the number of surfaces, the closer to a spherical shape, and the directionality is eliminated, which is preferable. In the case of the hard filler 49 in the shape of confetti, it is preferable to make the size of the minute projections substantially uniform and to reduce the deviation of the position distribution, because the directionality by the projections is reduced.

  In addition, it is preferable to use a hard filler as a granular material because filling into the plastic fluid 30 is facilitated and the damping performance is stabilized. For example, since the spheroid shape, columnar shape, disc shape, peanut shape, soccer ball shape, and konpei sugar shape are all independent of the behavior of the hard filler in the plastic fluid 30, Can be considered. Furthermore, as shown in FIG. 6, even if the hard filler 51 has an indefinite shape (the shape is not constant), each of the hard fillers 51 is included in the granular material as long as it is independently granular.

In short, the plastic fluidized material of the present invention can stabilize the dispersion state of the hard filler as long as it is composed of an elastic perfect plastic material (non-hardened elastic plastic material). In particular, the shear yield stress τy of the plastic fluidized material is preferably 0.1 MPa or more and 10 MPa or less. That is, by setting the pressure to 0.1 MPa or more, sufficient attenuation performance can be obtained. By setting the pressure to 10 MPa or less, the plastic fluidized material can be greatly plastically deformed. In the present invention, the frequency distribution of the representative length of the hard filler is not necessarily a double mountain type having two maximum values. It is not limited to this, As mentioned above, what has three or more maximum values (refer FIGS. 9-11) may be sufficient. In addition, the particle group constituting the hard filler is not limited to the two particle groups A and B shown in FIG. 7, and three or more particle groups having different maximum values may be mixed.

It is sectional drawing which shows the laminated support body of one Embodiment of this invention before a deformation | transformation, (A) is a whole block diagram, (B) is a partial enlarged view. It is sectional drawing which shows the laminated support body of one Embodiment of this invention after deformation | transformation, (A) is a whole block diagram, (B) is a partial enlarged view. It is the elements on larger scale of the laminated support body of a comparative example, (A) is before a deformation | transformation, (B) is after a deformation | transformation. (A)-(F) are all perspective views which show the example of the hard filler applicable to the lamination | stacking support body of this invention. It is a graph which shows the stress-strain characteristic of an elastic perfect plastic body. It is a front view which shows the example different from what was shown in FIG. 4 of the hard filler applicable to the laminated support body of this invention. It is a graph which shows the relationship between representative length and frequency distribution for every particle group A and B about the hard filler applied to this invention. It is a graph which shows the relationship between representative length and frequency distribution in the mixed state of the particle groups A and B of the hard filler applied to this invention. It is a graph which shows the relationship between representative length and frequency distribution by the example different from what is shown in FIG. 8 in the mixing state of the particle group of the hard filler applied to this invention. FIG. 10 is a graph showing a relationship between representative length and frequency distribution in a mixed state of hard filler particle groups applied to the present invention in an example different from that shown in FIGS. 8 and 9. It is a graph which shows the relationship between representative length and frequency distribution by the example different from what is shown in FIGS. 8-10 in the mixing state of the particle group of the hard filler applied to this invention. It is a graph which shows the relationship between the value of Ds / Dl and air content rate (epsilon) when changing the ratio of the size of a particle group about two types of particle groups A and B which concern on this embodiment. It is a graph which shows the relationship between Vl / (Vl + Vs) and air content rate (epsilon) when changing the volume ratio of a particle group about two types of particle groups A and B which concern on this embodiment. It is a graph which shows the relationship between the air content rate of the test body used by the test which concerns on this invention, and durometer hardness (type D).

Explanation of symbols

12 Laminated support 14 Flange plate 14F Flange portion 16 Laminated elastic body 18 Metal plate 20 Rubber plate 22 Cover material 24 Closure plate 28 Elastic body hollow portion 29 Plug 30 Plastic fluid material 32 Spherical body 36 Hard filler 38 Hard filler 39 Hard Filler 41 Hard filler 48 Hard filler 49 Hard filler 51 Hard filler

Claims (7)

A laminated elastic body in which a rigid plate having rigidity and an elastic plate having elasticity are alternately laminated in a predetermined lamination direction, and a hollow portion is formed in the lamination direction;
A plastic fluidized material composed of an elastoplastic material and injected into the hollow portion;
A hard filler filled in the plastic fluidized material;
Have
Of the representative lengths taking the top two maximum values of the frequency in the representative length distribution of the hard filler, the larger one is Dl and the smaller one is Ds.
0.001 ≦ Ds / Dl ≦ 1/3
A laminated support characterized by satisfying The laminated support according to claim 1, further comprising:
0.001 ≦ Ds / Dl ≦ 1/4
A laminated support characterized by satisfying A laminated support according to claim 1 or claim 2, wherein
In the distribution of representative lengths of the hard filler, the representative length that takes the minimum value between the two highest local maximum values is Dc, and the total volume of large particles having a representative length larger than Dc is Vl. When the total volume of small particle groups having a length of Dc or less is Vs,
0.4 ≦ Vl / (Vl + Vs) ≦ 0.8
A laminated support characterized by satisfying The laminated support according to claim 3, further comprising:
0.5 ≦ Vl / (Vl + Vs) ≦ 0.7
A laminated support characterized by satisfying   The laminated support according to any one of claims 1 to 4, wherein a shear yield stress τy of the plastic fluidized material is 0.1 MPa ≤ τy ≤ 10 MPa.   The laminated support according to any one of claims 1 to 5, wherein the hard filler has a substantially spherical shape. A laminated elastic body in which a rigid plate having rigidity and an elastic plate having elasticity are alternately laminated in a predetermined lamination direction, and a hollow portion is formed in the lamination direction;
A plastic fluidized material composed of a non-curing type elastic perfect plastic material and injected into the hollow portion;
A hard filler filled in the plastic fluidized material;
Have
Of the representative lengths taking the top two maximum values of the frequency in the representative length distribution of the hard filler, the larger one is Dl and the smaller one is Ds.
0.001 ≦ Ds / Dl ≦ 1/3
The filling,
In the distribution of representative lengths of the hard filler, the representative length that takes the minimum value between the two highest local maximum values is Dc, and the total volume of large particles having a representative length larger than Dc is Vl. When the total volume of small particle groups having a length of Dc or less is Vs,
0.4 ≦ Vl / (Vl + Vs) ≦ 0.8
A laminated support characterized by satisfying

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