JPS63140136A - Rubber vibration isolator having quadratic surface - Google Patents

Abstract

PURPOSE:To obtain a rubber vibration isolator also functioning as an air spring by forming a substantially bowl-shaped main body by elastic material, forming the outer surface thereof in the quadratic surface in such a manner that the thickness of the main body is charged from the bottom edge to the top, and positioning a load plate member on the top of the main body. CONSTITUTION:A bowl-shaped rubber vibration isolator main body 1 is formed by elastic material such as rubber or the like, and the outer surface thereof is formed in the quadratic surface. The thickness (t) of the wall surface of the main body 1 decreases gradually from the bottom edge side. A load plate member 4 is positioned in contact with the top of the bowl-shaped main body, and a bar member 6 for load is fixed and connected to a boss 5 of the plate member by screwing. When load is transmitted to the main body 1, the thin side of the quadratic surface of the main body 1 gradually contacts the lower surface of the load plate member according to the load to change the length from the bottom edge thick side to the contact point, thereby producing force of burden for load. Simultaneously a sealed chamber 7 functions also as an air spring.

Description

[Detailed Description of the Invention] <Industrial Application Field> A mount for a measuring instrument that must prevent transmission of vibrations from equipment, piping, etc., reduce noise inside a building, or be unaffected by external vibrations. The present invention relates to the structure of vibration-isolating rubber (hereinafter, the term "rubber" is used as a general term for materials with elasticity for vibration-isolating purposes) used in equipment such as vibration-isolating rubber.

<Prior art and its problems> Regarding noise inside buildings, solid-state noise from building equipment and the like has become a major problem. As a measure to prevent solid sound,
There are anti-vibration measures for equipment piping, etc., and countermeasures using conventional anti-vibration rubber and anti-vibration hanging tools have been taken, but sufficient countermeasure effects have not been obtained. Development of rubber equipment is desired.

As conventional anti-vibration means, anti-vibration rubber shown in FIGS. 17 to 19, a rubber anti-vibration mat shown in FIG. 20, an air splash or a spring coil shown in FIG. 21, etc. are known.

In the anti-vibration rubber shown in Figures 17 to 19, vibration isolation is achieved by deformation of the rubber material, and the vibration frequency is determined to be appropriate depending on the material, the range of application is limited according to the strength corresponding to the load, and the material is There are problems such as deterioration of A similar problem exists with the rubber mat shown in FIG.

The air spring shown in FIG. 21 has a problem in that it requires many attached devices such as a compressed air supply and a tank, is expensive, and requires monitoring. Spring fill has problems with frequency application range, resonance, etc.

<Object of the Invention> The present invention relates to the structure of a vibration isolating rubber device that has a simple structure and also has the function of an air spring.

Summary of the Means for Carrying Out the Measures> The present invention includes a substantially bowl-shaped main body made of an elastic material, the outer surface of which is formed into one or more quadratic curved surfaces, and the thickness of the main body changing from the bottom edge to the top. This invention discloses the structure of a vibration isolating rubber device having a quadratic curved surface in which a load plate member whose contact area changes depending on the applied load is placed in contact with the top of the main body.

<Example 1> FIG. 1(A) is a drawing showing a longitudinal section of a vibration-proof rubber according to a first example. A bowl-shaped vibration-proof rubber body 1 is made of an elastic material such as rubber, and its outer surface is formed as a quadratic curved surface.

Here, quadratic surfaces include spheres, paraboloids, ellipsoids, hyperboloids, and
This is the song (2) for the next distorted surface, etc. In the first embodiment, the wall surface of the main body 1 is allowed to run smoothly, and the contact with the object 3 is made to be good, and the effect of air splashing, which will be explained later, is enhanced.

A load plate member 4 is located in contact with the top of the bowl-shaped main body, and a load rod member 6 is fixedly connected to the boss 5 by screwing or the like. The rod-shaped body 6 transmits vibration and load to the main body 1, and its deformation provides vibration isolation.What should be noted is that when the load is transmitted to the main body 1, the thinner side of the quadratic curved surface of the main body 1 Then, depending on the load, it contacts the lower surface of the load plate member one by one and changes the length from the thick side of the bottom edge to the contact point. Regarding only the left half, a load-bearing force corresponding to the change in the length of the cantilever in the cross section of the side wall is generated.At the same time, the space inside the bowl-shaped main body 1 is a sealed chamber. 7, which also has the function of an air spring. However, since the rod-shaped body 6 is inserted through the object 3 such as a channel plate, there is a gap between it and the buffer hole 8, and from this, the air in the chamber 7 is works differently from a simple air spring that moves in and out and has a buffering force.Simple load (static)
The diagram of the relationship between the load and the displacement δ in the load direction when .

In this case, the outer diameter C of the load plate member 4 is the outer diameter D of the bottom edge of the main body 1.
A case is shown in which the contact between the load plate member 4 and the main body 1 when receiving a load is limited by setting the value to be smaller than 0. In the case of Example 1, a linear plus non-linear load displacement diagram with a small spring constant is shown.

<Embodiment 2> In this Embodiment 2, the outer diameter of the load plate member 4a is approximately equal to the diameter of the bottom edge of the main body 1a, and the case where the load is applied from above the load plate member is shown in "3".

In this case, there is no air leakage from the chamber 7a due to the deformation of the main body 1.

The load displacement curve is shown in FIG. 2(B). The characteristics are nonlinear with a large spring constant.

<Embodiment 3> FIG. 4(A) shows Embodiment 3, in which the outer shape of the load plate portion 4c is a plate having a trapezoidal cone shape in cross section.

At the early stage of displacement of the load plate member, the contact area with the main body increases rapidly, and the load displacement curve is shown in Figure 3 (B
) has a rapid rise as shown in the figure. The characteristics are nonlinear with a maximum spring constant.

<Embodiment 4> As shown in FIG. 4(A), the load plate member is an inverted trapezoidal conical flock 4d, and as shown in FIG. 4(B), the spring constant is minimal and the characteristics are linear.

<Embodiment 5> FIG. 5 shows a fifth embodiment, which is a device in which the vibration isolating rubber shown in FIG. 2 shares a load plate member and the tops of the main bodies are opposed to each other. Of course, it can also be formed by bringing the load plate members 4C in FIG. 3 into opposing contact.

It can also be formed by bringing the bottom surfaces of the trapezoidal conical blocks shown in FIG. 4 into contact with each other. The cushioning function is a combination of two anti-vibration rubbers. Furthermore, the main body 1e of both anti-vibration rubbers, the chamber 7e of le
, 7e in the center of the load plate, the air spring characteristics can be changed.

Also, it is not a combination of the same type of anti-vibration rubber, as shown in Figure 2.

The combination shown in FIG. 3 may also be used.

<Embodiment 6> In Fig. 6, a sleeve 9 is provided on the plate of the object 3f in place of the buffer hole 8 in Fig. 1, and the gap with the rod-shaped body 6f and the height (length) of the sleeve can be adjusted. A part of the buffering function can be adjusted by adjusting the resistance of air breathing from the chamber 7f during buffering.

<Embodiment 7> FIG. 7 shows a case where a connection fitting 10 for hanging is provided and the function of two vibration-proof rubbers is given to the hanging load. The anti-vibration rubber may be selected from any of the types described in the embodiments of the present application and may be combined in any combination.

<Embodiment 8> FIG. 8 shows a case where one vibration-proof rubber is attached to the hanging connection fitting 10a.

<Embodiment 9> FIG. 9 shows a vibration isolating rubber in which the wall thickness t of the main body wall is increased from the bottom edge side.

<Example 10> FIG. 10 shows a vibration isolating rubber in which quadratic curved surfaces are provided in two stages, lla and Ilb.

<Example 11> In the case of the two-stage type shown in FIG. 10, FIG. 11 shows the quadratic curved surface 11c,
This anti-vibration rubber is used when the load plate member lie is provided between the sleeves lld and lld, and has the feature that the air breathing in the sleeves llf and l1g can be adjusted in two stages.

Embodiment/Example 12> - Fig. 12 shows a case where the board 12 is supported by a plurality of anti-vibration rubber devices for anti-vibration of a measuring device.

<Embodiment 13> FIG. 13 shows a case where the legs of a machine are supported by a vibration isolating rubber device according to the embodiment of the present invention. In the various embodiments described above, a spring can be inserted into the chamber 7 of the main body to change the buffering function.

<Effects of the Invention> Conventional anti-vibration rubbers only utilize the elastic properties of rubber, that is, those that rely on the loss of vibration energy within the rubber due to compression and deformation, and those that utilize the elastic properties of air as shown in air springs. Ta.

On the other hand, by using the vibration isolating rubber device according to the present invention, the following effects can be obtained.

(υ The rubber shape forms a quadratic curved surface, and it utilizes the folded elastic properties of this curved surface, that is, the shape of the curved surface and the rubber elastic properties, and has a structure that is not found in conventional products. By combining the anti-vibration rubber devices of the embodiments of the present invention, various desired anti-vibration effects can be obtained.

(O) By placing the anti-vibration rubber of the present invention on a flat plate, the characteristics of air rubber can be easily obtained, and a pressurized air source is not required for L.

(3) The thickness of the rubber constituting the quadratic curved surface is uniformly increased or decreased as shown in the example-surface, and the thickness is unequal, and the thickness does not come into contact with the surface of the load plate member depending on the load. It has the characteristic that the point moves. This allows the anti-vibration □ rubber to have the ability to handle complex load displacements as the thickness of the main body changes.

It should be noted that the anti-vibration side lines shown by comparing the experimental measurements shown in Fig. 15 for the anti-vibration rubber shown in Fig. 8 according to the implementation of the present invention and Fig. 14 for the commercially available anti-vibration rubber may be loose. The fact that it is horizontal indicates that the anti-vibration rubber of the present invention is highly effective.

FIG. 16 shows the vibration damping (dB) versus frequency (Hz) in comparison with the example of the present invention and the commercially available product, and it can be seen that it is significantly superior at all frequencies.

[Brief explanation of the drawing]

FIG. 1(A) is a vertical cross-sectional view of the vibration isolating rubber of the first embodiment of the present invention, FIG. 1(B) is its load/displacement oil source, and FIG.
) is a vertical cross-sectional view of the anti-vibration rubber of the second embodiment, Figure 2 CB)
is its load/displacement curve, Figure 3 (A)! 3134B) of the anti-vibration rubber of the third embodiment
4(A) is a vertical cross-sectional view of the vibration isolating rubber of the fourth embodiment, FIG. 4(B) is its load/displacement curve, and FIG. 5 is a longitudinal cross-sectional view of the vibration isolating rubber of the fifth embodiment. 6 is a vertical sectional view of the vibration isolating rubber according to the sixth embodiment, FIG. 7 is a vertical sectional view of the device including the connection fittings for hanging using two sets of vibration isolating rubber, and FIG. FIG. 9 is a vertical sectional view of a device including a connection fitting for hanging one set of vibration isolating rubber, FIG. 9 is an α sectional view of the vibration isolating rubber of the ninth embodiment, and FIG.
The figure is a vertical sectional view of the vibration isolating rubber of the 10th practical example having a two-stage quadratic curved surface, and FIG. Figure 12 is the first
A schematic vertical cross-sectional view when used for measurement of the second embodiment,
The 13th lens 1 is used for the +4 leg of the 13th embodiment, and the analysis of the model 7':'A, 71.4. J is commercially available 2
Figure 15 is a drawing showing the test results of the tiered anti-vibration rubber suspension, Fig. 15 is a drawing showing the test results of the single-stage anti-vibration rubber of the present invention, and Fig. 16 is a comparison of the performance of the commercially available anti-vibration rubber mat and the anti-vibration rubber of the present invention. Figure 17 is a side view of a conventional rubber working pressure linear vibration isolator, Figure 18 is a partially vertical side view of a conventional new type anti-vibration rubber, and Figure 19 is a conventional composite type anti-vibration rubber. Fig. 20 is a partially longitudinal sectional side view of a vibration-proof rubber mat, and Fig. 21 is a longitudinal sectional view of a commercially available anti-vibration rubber mat.
The figure is a longitudinal cross-sectional view of an air spring. 1... Main body 2... Flange-shaped exhibition part 3.
...Object 4...Load plate member 5...
...Pos 6...Rod-shaped body 7...Chamber 8...Buffer hole 9...Sleeve
10... Connection fittings 11a, 11b...
Quadratic curved surface 12... Disc body 13... Hole 14. ,,,, Annular protrusion (A) 3rd
Figure (B) Figure 5 Figure 6 Figure 7 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1. A substantially bowl-shaped main body is formed of an elastic material, its outer surface is formed into one or more quadratic curved surfaces, and the thickness of the main body is varied from the bottom edge to the top. A vibration isolating rubber device having a quadratic curved surface, characterized in that a load plate member is placed in contact with the top of the main body, the contact area of which changes depending on the applied load. 2. A vibration isolating rubber device having a quadratic curved surface as set forth in claim 1, characterized in that a brim-like extension portion having an annular projection on the lower surface is provided on the bottom edge of the main body. 3. A vibration isolating rubber device having a quadratic curved surface according to claim 1 or 2, characterized in that a load rod-shaped body is connected to the load plate member. 4. Having a quadratic curved surface according to any one of claims 1 to 3, characterized in that the diameter of the loading rod-shaped body is smaller than the diameter of the buffer hole of the penetrating portion of the load-receiving member. Anti-vibration rubber device. 5. 2 as claimed in any one of claims 1 to 4, characterized in that a plate is connected to the bottom edge of the main body, and a sleeve is provided at a place where the rod-shaped body passes through the plate. Anti-vibration rubber device with a curved surface. 6. A load plate is inserted between two main bodies with their tops facing each other, and a hole communicating with the two chambers of the main body is provided in the center of the load plate. A vibration isolating rubber device having a quadratic curved surface according to item 1 or 2. 7. Claims characterized in that one vibration isolator is formed by connecting two vibration isolating members each having a load rod-shaped body through a connecting fitting with the load plate members facing each other. A vibration isolating rubber device having a quadratic curved surface according to any one of items 1 to 5. 8. Place a common plate instead of each load plate member on the top of a plurality of prevention rubber bodies located at intervals on a fixed floor, and install a measuring device that requires vibration isolation on the top surface of this plate. Claim 1 or 2 characterized in that
Anti-vibration rubber device having a quadratic curved surface as described in . 9. A vibration isolating rubber device having a quadratic curved surface according to any one of claims 1 to 7, wherein the load plate member is a disk having a smaller diameter than the outer diameter of the bottom edge of the main body. . 10. The vibration isolating rubber having a quadratic curved surface according to any one of claims 1 to 7, wherein the load plate member is a disk having a larger diameter than the outer diameter of the bottom edge of the main body. Device. 11. The vibration isolating rubber having a quadratic curved surface according to any one of claims 1 to 7, wherein the load plate member is a plate whose outer shape is trapezoidal and conical in cross section. Device. 12. A vibration isolating rubber device having a quadratic curved surface according to any one of claims 1 to 7, wherein the load plate member is an inverted trapezoidal conical block. 13. One end of the connecting fitting is connected to a rod-shaped body with a fixed end,
6. A vibration isolating rubber device having a quadratic curved surface according to any one of claims 1 to 5, wherein the other end is connected to a vibration isolating member having a rod-shaped body for loading. 14. The vibration isolating rubber having a quadratic curved surface according to any one of claims 1 to 13, characterized in that the main body is formed so that its wall thickness decreases from the bottom edge toward the top. Device. 15. A vibration isolating rubber device having a quadratic curved surface according to any one of claims 1 to 13, characterized in that the thickness of the main body increases from the bottom edge toward the top. . 16. A vibration isolating rubber device having a quadratic curved surface according to any one of claims 1 to 15, characterized in that the quadratic curved surface is composed of two stages of quadratic curved surfaces. 17. A vibration isolating rubber device having a quadratic curved surface as set forth in claim 16, characterized in that a load plate member is provided in addition to the top load plate member at the boundary between the two quadratic curved surfaces. .