JP2010255827A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device for effectively suppressing the radially outward tensile force of an elastic plate on the adhered outer edge positions of rigid plates and their vicinities to effectively prevent the occurrence of crack in the adhered outer edge positions and their vicinities over a long period by relatively reducing the deformation cumulative amount of the elastic plate in the radially outward direction along with the compression displacement of the rigid plates. <P>SOLUTION: The vibration control device includes single units 4 each consisting of the pair of upper and lower rigid plates 2, 2 spaced from each other and the elastic plate 3 adhered thereto while completely satisfying the space. The thickness of the elastic plate 3 of at least one single unit 4 is greater than the minimum thickness of a central portion 8 of the single unit in a region 7 around the edge of the single unit 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  This invention is a unit unit formed by adhering elastic plates such as a rubber plate, a plastic plate, an elastomer plate, etc., which completely satisfy the interval between a pair of upper and lower rigid plates spaced apart from each other, for example, a horizontal posture. Many are related to vibration isolators that are combined in multiple stages, and in particular, the amount of protrusion when the elastic plate of a unit unit that has undergone compression deformation protrudes outward from the edge of the rigid plate. The technique which improves the durability of an elastic board by reducing this effectively is proposed.

A conventional vibration isolator of this type is disclosed in Patent Document 1.
This is applied to vibration structures such as automobiles and vibration industrial machines, and the vibration isolation characteristics are actively changed according to fluctuations in vibration characteristics such as vibration frequency of the structure. An anti-vibration device in which a rubber portion is sandwiched between plates, and the rubber portion is divided in a horizontal direction by one or more intermediate plates to form a laminated state. The support plate and the intermediate plate are conductive plates, respectively, and a control voltage can be applied between the conductive plates.

In this vibration isolator, the rubber portion between the supporting metal plate or the intermediate metal plate is an electroviscous rubber, and a control voltage can be applied between the supporting metal plate or the intermediate metal plate. When the vibration characteristics such as the frequency of the object fluctuate, the fluctuation of the vibration characteristic is detected by the displacement amount detection means, the detection signal from the displacement amount detection means is input to the voltage control means, and is discriminated by the voltage control means. By inputting the control signal to the voltage applying means, the viscoelastic characteristics of the rubber layers between the supporting metal plate or the intermediate metal plates, that is, the vibration isolating characteristics can be changed.
Accordingly, it is assumed that it is possible to actively change the anti-vibration characteristic of the anti-vibration rubber, that is, the viscoelastic characteristic of the rubber part, in response to the fluctuation of the frequency peak of driving.

JP-A-5-10389

  However, in this prior art, each of the upper and lower support plates, the divided rubber portions, and the intermediate plate is disposed as illustrated in FIG. 5A in a longitudinal sectional view including the central axis, Each divided rubber portion 111 is laminated with a uniform thickness on the support plate 112 or the intermediate plate 113 arranged in parallel with each other in a horizontal posture from the one side edge to the other side edge in the figure. Therefore, when the vibration isolator receives a large compressive force in the direction along the center axis CL, the divided rubber portion 111 that does not change in volume is illustrated in a partially enlarged manner in FIG. It is forced to be deformed by being pushed outward in the radial direction with respect to the central axis CL, and greatly projecting and deforming outward on the periphery of the support plate 112 and / or the intermediate plate 113, in the drawing, the intermediate plate 113.

  That is, as shown in the figure, in the vibration isolator in which each divided rubber portion 111 has a uniform thickness throughout, when each divided rubber portion 111 is compressed by a certain amount by, for example, the intermediate plate 113, the divided rubber portion 111 is Since the deformation that is generated in equal amounts at any location in the radial direction with respect to the central axis CL is gradually accumulated toward the outer side in the radial direction, The amount of protrusion deformation from the peripheral edge of the plate 113 or the like inevitably increases.

  And according to this, a large radial outward force acts on the outer peripheral edge position of the divided rubber portion 111 to the intermediate plate 113 and the vicinity thereof, and this tensile force is divided into the divided rubber portions 111. There was a problem in durability that the rubber part 111 would crack relatively early.

  The object of the present invention is to solve such problems of the prior art, and the object of the invention is to deform the elastic plate accompanying the compression displacement of a rigid plate such as an intermediate plate. By reducing the accumulated amount in the radially outward direction relatively in the peripheral area of the rigid plate of the unit unit, the elastic plate acts on the outer edge position of the elastic plate bonded to the rigid plate and the vicinity thereof in the radial direction. It is an object of the present invention to provide a vibration isolator capable of effectively relieving the tensile force and effectively preventing the occurrence of cracks at the outer edge position of the adhesive and the vicinity thereof over a long period of time.

  Here, the relative reduction of the amount of deformation of the elastic plate in the radially outward direction is relative to the compressive force in the central axis direction of the elastic plate, which can be a rubber plate, a plastic plate, an elastomer plate, or the like. This can also be realized by increasing the elastic modulus, but according to this, the spring characteristics of the entire vibration isolator change, and the vibration isolator has sufficient required vibration suppression function, damping function, etc. There is a possibility that it cannot be demonstrated.

  The vibration isolator of the present invention comprises a plurality of unit units formed by adhering elastic plates that safely satisfy the interval between a pair of upper and lower rigid plates spaced apart from each other, for example, a horizontal posture, In at least one unit unit, more preferably all units that can be arranged in multiple stages, the maximum elastic plate thickness in the peripheral region of the unit unit is set to the minimum elastic plate in the central region of the unit unit excluding the peripheral region. It is made thicker than the thickness.

  Here, the “maximum elastic plate thickness in the peripheral region of the unit unit” means that the elastic plate may be thin even in the peripheral region where the thickness of the elastic plate increases. In addition, the “minimum elastic plate thickness” in the central area of the unit unit excluding this peripheral area is intended to cause the thickness to be thin even within the central area. It is.

  In the vibration isolator of the present invention, in at least one unit unit, the maximum elastic plate thickness in the peripheral region of the unit is made larger than the minimum elastic plate thickness in the central region of the unit under the increase of the rigid plate interval. For example, due to the rigid plate being displaced by a certain amount in the compression direction, the elastic plate has a minimum thickness portion in the central region of the unit, etc. The same amount of extrusion deformation as described in the prior art occurs, and even if this extrusion deformation is gradually accumulated in the same manner as described above toward the outside in the radial direction, the deformation toward the outside in the radial direction is reduced. On the other hand, in the area around the edge of the unit where the rigid plate interval is large, the clearance of the elastic plate increases, and the elastic plate, for example, the rubber plate, as illustrated in FIG. In the direction of Dispersed flow is widely allowed, and as a result, the total deformation amount of the rubber plate R facing outward in the radial direction is effectively reduced. The amount of bulging can be effectively reduced as compared with the prior art, and therefore, the tensile force in the radially outward direction of the rubber plate R is advantageously relaxed, and the rigid plate of the rubber plate R It is possible to prevent the occurrence of cracks in the position of the outer edge of adhesion to P and in the vicinity thereof over a long period of time, and greatly improve the durability of the vibration isolator.

  On the other hand, the thickness of the minimum thickness portion of the rubber plate R is made thinner than that of the prior art, and the thin plate is subjected to the same compression force when the rigid plate P is subjected to the compression displacement as described above. When the amount of extrusion deformation to the outside in the radial direction is reduced compared to the prior art, the cumulative amount of extrusion deformation to the outside in the radial direction is reduced by itself, and the edge of the unit Since the dispersion flow in the thick part of the rubber plate in the periphery of the part will be performed in the same manner as described above, the amount of protrusion of the rubber plate R from the periphery of the rigid plate is more effectively reduced, The tensile force acting on the rubber plate R outward in the radial direction can be more advantageously reduced.

  Moreover, under the deformed shape that bulges outward, the outer surface of the rubber plate has a larger radius of curvature, so that not only the adhesion interface but also the concentration of stress on the outer surface of the rubber plate is alleviated. You can also.

  And this means that in all unit units combined in multiple stages, for example, when the maximum thickness of the rubber plate in the peripheral region of the unit unit is made thicker than the minimum rubber plate thickness in the central region of the unit unit. More effective.

It is an approximate line longitudinal section which illustrates the operation of this invention about a unit unit. It is a longitudinal section showing a central axis showing an embodiment of this invention. FIG. 4 is a longitudinal sectional view similar to FIG. 2 illustrating another unit stacking state of the unit unit. It is a longitudinal cross-sectional view which shows the example of a change of a unit unit. It is a longitudinal cross-sectional view which shows a prior art.

  FIG. 2 is a longitudinal sectional view including a central axis showing an embodiment of the present invention, and the vibration isolator 1 includes a pair of upper and lower rigid plates 2 and 2 spaced horizontally from each other, for example, An elastic plate, for example, a rubber plate 3 that completely satisfies the interval is bonded without vacancy by vulcanization bonding, adhesive bonding, or the like. Each of the upper and lower face plates 5 attached to the combined structure is provided with a male screw member 6 for mounting.

  Here, in at least one unit unit 4 of the apparatus 1, in the figure, in all the unit units 4, the peripheral edge region 7 of the unit unit 4, and in the figure, the pair of rigid plates 2 are separated from each other. The maximum rubber plate thickness in the widened peripheral area formed by bending and deforming in the direction is increased from the minimum rubber plate thickness in the remaining central area 8 of the unit unit 4.

  FIG. 3 is a longitudinal sectional view similar to FIG. 2 illustrating another unit stacking state of each unit, combining each unit in three steps without a gap, and combining the rigid plate of one unit, In the illustrated example shared by other adjacent units, a portion indicated by 14 in the figure is a portion satisfying the requirements of the unit unit specified in the present invention.

  3 (a) and 3 (b), units having the same structure in which the outer dimensions of the plane are the same are arranged in the first stage and the third stage, and the same outer contour as those units. The thickness of the elastic plate, for example, the rubber plate 3, of the second-stage unit having dimensions is reversed from that of the first and third stages.

  That is, in the combination example shown in FIG. 3A, a unit unit portion 14 that satisfies the requirements of the present invention is provided at the center portion of each of the units 21 and 22 in the first stage and the third stage. A pair of unit unit portions 14 are provided on both the left and right sides of the step unit 23 at a center position in the longitudinal sectional view.

  Further, in the combination example shown in FIG. 3B, in the combination example shown in FIG. 3A, the second stage unit 23 is configured in the same manner as described above, while the first stage and the second stage A rubber plate as an elastic plate is omitted from between the rigid plates 24 in a portion radially outward from the unit unit portion 14 located in the central portion of each of the units 21 and 22 in the third stage.

  In any of these unit arrangements shown in FIG. 3, at least each unit unit portion 14 is made of a rubber plate as an elastic plate by configuring one or more unit unit portions 14 as described above according to the present invention. Effectively suppressing the radial outward tensile force of the unit portion 14 acting on the position of the outer edge of the adhesion to the rigid plate and the vicinity thereof, and effectively preventing the occurrence of cracks at those locations Can do.

FIG. 4 is a longitudinal sectional view illustrating various unit units 4 targeted by the present invention. The unit 4 shown in FIG. 4A is a central region 8 excluding the peripheral region 5, and is attached to the rubber plate 3. Each of the center thick part 9 and the thinnest part 10 positioned adjacent to the center thick part 9 is provided, and the thickness T of the rubber plate 3 in the peripheral edge region 7 is set to be larger than the rubber plate thickness in the center thick part 9. Even if it has this unit unit 4 shown in figure, it can bring about the same effect as mentioned above especially with respect to the compression deformation of the thin part 10.
In this figure, the maximum thickness of the center thick portion 9 is made thicker than the thickness T, and the minimum thickness of the thinnest portion 10 is made thinner than the thickness T, which is unique to the present invention. A working effect can be brought about.

  4B, the unit unit 4 illustrated in FIG. 4B has a central region 8 excluding the peripheral region 7, and the thickness of the rubber plate 3 is set to the center from both the upper and lower directions of the drawing with each pair of rigid plates 2. The thickness of the rubber plate 3 is minimized at the center position of the central region 8 by decreasing the curve toward the center, and the unit unit 4 illustrated in FIG. Of the plates 2, the lower rigid plate 2 in the figure is a flat plate, while the central area 8 of the upper rigid plate 2 in the figure is recessed to a predetermined constant depth with respect to the peripheral area 7. Thus, the minimum thickness of the rubber plate 3 is set to a uniform thickness similar to that shown in FIG.

  The unit unit 4 as described above is also used as the vibration isolator 1 in a combination state such as a stacked combination state illustrated in FIGS. 2 and 3 and includes a slight damping function against vibration in the compression direction. The required anti-vibration function can be fully exhibited.

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 2 Rigid board 3 Rubber board 4 Unit unit 5 Face board 6 Male screw member 7 Peripheral area 8 Center part 9 Center thick part 10 Thinnest part CL Center axis T Thickness t Minimum thickness

Claims (2)

A vibration isolator comprising a plurality of unit units formed by adhering an elastic plate that completely satisfies the interval between a pair of upper and lower rigid plates spaced from each other,
A vibration isolator comprising at least one unit unit, wherein the maximum elastic plate thickness in the peripheral region of the unit unit is greater than the minimum elastic plate thickness in the central region of the unit unit.   The anti-vibration device according to claim 1, wherein in all of the unit units combined in a plurality of stages, the maximum elastic plate thickness in the peripheral region of the unit unit is made thicker than the minimum elastic plate thickness in the central region of the unit unit. .

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