JPS5855376B2 - Composite vibration-resistant structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a composite vibration-resistant structure.

Blocks or plates made of various materials such as cork, felt, rubber or (1) plastics are often used to damp especially vibrations generated in machines or transmitted to equipment whose function is impaired by vibrations.

The materials used for anti-vibration devices must have certain properties, such as:

In other words, it must have a flexible elastic structure, be able to resist displacement and vibration of applied loads, and be able to resist large loads.

and have sufficient resistance to foreign substances.

Since there is no material that can simultaneously meet these various conditions, Applicant 1's French Patent No. 7
In 610649 (publication number 2348402), a composite damping structure was proposed in which two plates made of elastic materials with different shore hardnesses were brought into contact with each other.

The contact surface Gi of the plate proposed in this French patent is formed by providing parallel grooves in a straight line or by providing concentric grooves to form unevenness.

It has a cross-sectional shape such as a trapezoid (crenel shape), a triangular shape (teeth shape), or a sinusoidal curve shape, and is formed so that two plates are interlocked with each other.

Also. In order to prevent the material supported on the damping plate from shifting and the damping plate from shifting on the ground, deformable blocks are provided on both sides of the plate.

The vibration waves propagating in the horizontal direction pass through the uneven parts of each plate, thereby attenuating the frequency, and this type of damping plate is a significant improvement over previously known vibration-resistant systems. and its performance is much higher than that of prior art devices.

This is because the two members are made of elastic members having different shore hardnesses.

In other words, vibration waves propagate at different speeds when propagating in materials of different hardness, or vibration waves tend to be reflected at contact surfaces with materials of different hardness, so vibration waves can be divided into two types. The vibrations are reflected at the contact surfaces of the plates and remain within the same plate, or are propagated across the contact surfaces at different speeds, making it possible to effectively damp vibrations.

However, in the above damping structure, when the grooves are formed in a straight line, only vibration waves propagating in a direction perpendicular to the grooves are attenuated, and vibration waves propagating in a direction parallel to the grooves are attenuated. It has the disadvantage that the contact surfaces of the two plates do not meet and are not damped.

This is the same when grooves are formed concentrically, and in particular, the vibration waves propagating in the circumferential direction do not meet the boundary with the air, so no satisfactory obstacles are formed, and the vibration waves It has the disadvantage that attenuation is not effective.

Further, the two damping plates described in the French patent are bonded to each other by a flexible adhesive that has adhesive properties and can be deformed.

In this way, by interposing the adhesive between the two plates, there is a risk that vibration waves will propagate more easily and the damping performance will deteriorate, and there is also the disadvantage that manufacturing becomes complicated. There is.

The present invention was made in order to eliminate the above-mentioned lack of depth, and allows two parts with different hardnesses to be joined to each other without using an adhesive, and in which direction vibration waves propagate. It is an object of the present invention to provide a composite vibration-resistant structure in which a force is allowed to pass through the contact surfaces of the two parts.

Distantly related to the above object, the present invention provides a composite vibration-resistant structure constructed by contacting at least two parts of elastically deformable materials with different Shore hardnesses, in which the two parts with different Shore hardnesses are The contact surfaces of the two parts have a hardness difference equal to at least 20 points, and the contact surfaces of the two parts are formed by disposing block-shaped protrusions with square or rectangular bases and correspondingly shaped indentations on these contact surfaces in the form of a dice. hand,
The contact surfaces of these parts have mutually complementary profiles that define the eyes of the base, and the blocks of one part are simply fitted into the recesses of the other part, and adhesive is used at the interface. By assembling the two parts by fitting the blocks arranged in the shape of a dice and the recess into each other, a dice-like contact surface between these blocks and the recess is formed. , the vibration waves encounter the contact surface many times no matter what direction they propagate.

Therefore, it is possible to effectively attenuate vibration waves.

"One block" in the meaning of the present invention means, for example, a pyramid shape, a conical shape, a truncated pyramid shape, a truncated conical shape, etc.
means all protrusions with a cross section that decreases from the base (base force) to the top surface.

Because of this close assembly structure of blocks and hollows,
Unlike the anti-vibration structure of Patent No. 7,610,649 mentioned above, the two parts are fixed to each other by a simple inset, but in a preferred embodiment of the invention ('l!, in the case of a block with a flat surface on the top (e.g. a truncated In the case of pyramidal or truncated conical shapes), it is desirable to provide a suction cup recess on this top surface in order to better connect the corresponding block and recess to each other.

As mentioned in the above-mentioned French patent, 1 the outer surfaces of the two parts of the vibration-resistant structure according to the invention, i.e. the outer and inner surfaces of this structure ("), resist the movement of objects supported on this structure and Preferably, deformable blocks are provided to prevent the structure from sliding on the ground.

These blocks can have the same shape as the blocks at the interface of the two parts of the device, or they can have a different shape.

Preferably, the block on the surface of the lower part in contact with the support or the ground is provided with a recess forming a suction cup.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

The structure shown consists of two plates 1 and 2 of elastically deformable material.

The hardness of the constituent materials of these plates may be different, for example, one plate may have a hardness of 40-60 and the other plate may have a hardness of 60-80.

Preferably, the shore hardness of the two plates differs by at least 20 points.

By way of example, elastomers of the type sold under the trade names Neoprene, Viton or Hypaguchi can be used.

The contact surface or interface 3 of each of these plates 1 and 2 comprises a square-bottomed pyramidal block 4 and a recess 5 of complementary shape, the blocks and the recess 5
are alternately and regularly arranged to form base stripes as seen in FIG.

As mentioned earlier, the blocks 4 of one plate fit into the recesses 5 of the opposite plate surface, so that plates 1 and 2
are completely fixed to each other and no adhesive is required.

However, to further increase the rigidity of this assembly, the block 4 of plate 2 is in contact with the bottom surface of the recess 5 of plate 1.
A recess 6 is provided at the center of the top surface to form a suction cup.

Of course, it is also possible to provide a recess similar to 6 on the block 4 of the plate 1.

The outer surfaces of the plates 1 and 2 are also provided with blocks 7 and 8 similar to the block 4.

As shown in FIG. 1, the top surface of the block 7 that comes into contact with the ground 9 is also provided with a
A recess 10 can be provided as a suction cup.

Of course, a similar recess can also be provided on the block 8 of the plate 2.

As explained in detail in the above-mentioned patent no. 7,610,649, the Shore hardness of each of plates 1 and 2 depends on the load to which the plates are subjected, and the composite Shore hardness of the assembly is also proportional to the load.

Applicant's tests have shown that the performance of the structure according to the invention is much higher than that of known anti-vibration devices of the prior art, and that its damping characteristics are the same whatever the vibration frequency.

This is different from normal equipment.

[Brief explanation of drawings]

1 and 2 show an embodiment of a composite vibration-resistant structure according to the present invention, with FIG. 1 being a bottom view of the upper part of this structure, and FIG. 2 being a longitudinal sectional view. 1.2...Plate, 3...Joint surface,
4...Block, 5...Indentation, 6.
...Concavity, 7,8...Flock.

Claims (1)

[Claims] 1. In a composite vibration-resistant structure constructed by mutually contacting at least two parts made of elastically deformable materials having different Shore hardnesses, the two parts having different Shore hardnesses have hardnesses equal to at least 20 points. The contact surfaces of the two parts are formed by arranging block-shaped protrusions with square or rectangular bases and correspondingly shaped depressions in a dice-like manner on these contact surfaces. The surface has complementary profiles that define the eyes of the base. A composite anti-vibration structure characterized in that it can be assembled by simply fitting the block of one part into the recess of the other part without using an adhesive at the interface. 2. A patent characterized in that the block of one part is formed so that its top surface is in contact with the bottom surface of a corresponding recess of the other part, and the top surface of the block of at least one part is provided with a recess forming a suction cup. A composite vibration-resistant structure according to claim 1.