JPS6252235A - Magnet damper - Google Patents

Abstract

PURPOSE:To realize a magnet damper with no influence received by a temperature difference further with the excellent execution property and shock resisting property, by connecting permanent magnets of metal system to be combined with a high molecular material. CONSTITUTION:A magnet damper 1 has construction such that a plurality of metal system permanent magnets 2 are connected and combined with a high molecular material 3 of rubber or plastics and the like. Each permanent magnet 2, being formed by a sintered material or a metal of various magnetic materials, is secured by adhesive mounting or embedding to the high molecular material 3 in an attitude such that the same magnetism appears in a mounting surface of the damper 1. The damper, when it is used, is mounted by magnetic attracting force to the surface of a vibrator 4 like an iron panel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a magnetic damper that is attached to a component or part that generates vibration or noise to obtain a vibration distribution effect.

[Prior art]

As one method for reducing vibration and noise, a method has been proposed in which a damping material is attached to the surface of a vibrating part to convert vibration energy into thermal energy.

For example, it can be used to dampen the vibrations of thick parts such as gears of automobiles and machinery, or highly rigid structures such as frames, to damp the panels of OA equipment, automobiles, ships, iron bridges, and machinery, and even to damp the vibrations of piping systems. In order to reduce vibration noise, a damping material may be attached to these surfaces.

As this type of damping material, damping materials based on polymeric materials, damping materials made of a single metal-based or polymer-based magnet, and the like have been proposed.

Polymer material-based vibration damping materials are made by mixing polymer materials such as rubber or plastic with fillers such as metal powder, sand, or mica to increase internal loss and convert vibration energy into thermal energy. It is.

However, with this polymer material-based damping material, the damping effect is easily influenced by the ambient temperature, and adhesives are required to adhere to the vibrating surface, making it difficult to install and cost. There is a problem.

On the other hand, an allocation material made of a single metal or polymer-based magnet attempts to convert vibrational energy into thermal energy through interfacial friction on the fixed surface when brought into contact with magnetic force.

However, if the damping material is made of a single magnet, it is easy to chip due to mechanical impact and post-processing is difficult as it requires a mold.
In the case of a polymer-based material, since the magnetic force is weaker than that of a metal-based material, there are problems such as the allocation material becomes thick and heavy when trying to obtain a desired magnetic force.

〔the purpose〕

The object of the present invention is to be able to solve the above-mentioned problems of the prior art, to exhibit excellent vibration damping effects regardless of temperature differences, and to
Moreover, it is an object of the present invention to provide a magnetic damper (distribution material using magnets) with excellent workability and impact resistance.

(Required) The present invention achieves the above object by connecting metallic permanent magnets with a polymeric material such as rubber or plastic to form a composite.

In addition to ordinary polymer materials, the polymer material may be a high-loss polymer material filled with metal powder, mica, or sand to increase internal loss, or a mixture of magnetic powder such as iron powder. It is possible to use special materials such as magnetic polymeric materials that have been magnetized, and the use of such special materials can improve the allocation effect.

Furthermore, the present invention further improves the distribution ability by adding a restraining layer, which is a plate-like mass of metal, hard rubber, or hard plastic, to the surface of the composite magnetic damper connected by polymeric materials as described above. The present invention also provides a magnetic damper with improved performance.

(Example〕 The present invention will be specifically described below with reference to the drawings.

1 and 2 show a plane and a longitudinal section of a magnetic damper according to an embodiment of the present invention.

In FIGS. 1 and 2, a magnetic damper 1 has a composite structure in which a plurality of (five in the illustrated example) metallic permanent magnets 2 are connected with a polymeric material 3 such as rubber or plastic. ing.

Each permanent magnet 2 is made of various magnetic sintered materials or metals, and the damper 1 is fixed to the polymeric material 3 by adhesive or embedding in a posture in which the same magnetism (S or N) appears on the surface. ing.

In use, it is attached to the surface of the vibrating body 4, such as an iron panel, by magnetic attraction. 1' The permanent magnet 2 in Figs. 1 and 2 has a rectangular parallelepiped or cubic shape, but it may be mounted in any other suitable shape as long as it is exposed in a planar shape. I can do it.

Furthermore, the polymer material 3 may include, in addition to ordinary polymer materials, high-loss polymer materials filled with metal powder, mica, or sand to increase internal loss, or magnetic powder such as iron powder. It is possible to use a magnetic polymer material that has been made magnetized by mixing with it.

According to the embodiments shown in FIGS. 1 and 2, interfacial friction occurs between the permanent magnet 2 and the vibrating surface (the surface of the vibrating body 4) and between the polymeric material 3 and the vibrating surface, which causes vibration. The energy is converted into thermal energy, and the vibration of the vibrating body 4 is reduced.

Further, since the surface of each permanent magnet 2 is covered with the polymer material 3, the permanent magnet can be protected from damage due to mechanical impact.

Furthermore, it is also possible to utilize the distribution effect due to the internal loss of the polymeric material 3 made of rubber, plastic, or the like.

In particular, if a high-loss polymer material filled with metal powder, mica, or sand is used as the polymer material 3 to increase internal loss, in addition to the interfacial friction, the vibration from the vibrating surface will increase the Bending vibration occurs in the molecular material, internal 1-1
It is possible to improve the ability to convert vibrational energy into heat by the heat source, thereby further improving the efficiency of allotment.

On the other hand, if a magnetic polymer phase *1 magnetized by mixing magnetic powder such as iron powder is used as the polymer material 3 described in iif, the adhesion force between the magnetic damper 1 and the vibration surface of the vibrating body 4 can be increased. This can further reduce the allocation effect on interfacial friction.

Furthermore, if a band-shaped magnetic damper is constructed by connecting a plurality of permanent magnets 2 in a chain with a polymeric material 3, the magnetic damper can be freely attached to a desired shape and arrangement to a certain extent without using a mold. Moreover, since no adhesive is required, it is possible to improve the ease of application.

FIGS. 3 and 4 show a magnetic damper 1 that differs from the previous embodiment only in that the shape of each permanent magnet 2 is changed to a cylindrical body.

The other parts of this embodiment are substantially the same as those of the previous embodiment, and corresponding parts are designated by the same reference numerals and detailed explanation thereof will be omitted.

As is clear from the foregoing description, various similar modified structures can be employed in the embodiments of FIGS. 3 and 4, and similar effects can be achieved in each.

FIG. 5 shows a magnetic damper according to yet another embodiment of the invention.

The embodiment shown in FIG. 5 has a plate-shaped This is the addition of a constraining layer 5 having a mass of .

That is, the magnetic damper 1 shown in FIG.
In the illustrated example, five metallic permanent magnets 2 are connected with a polymeric material 3 such as rubber or plastic to form a composite, and a plate-like mass of metal, hard rubber, or hard plastic is attached to the surface of the composite. It has a structure in which a constraining layer 5 is provided.

This restraining layer 5 is usually fixed by adhesive or the like, but if it is made of a magnetic material such as iron, it can also be fixed by using the magnetic attraction force of the permanent magnet 2.

According to the embodiment shown in FIG. 5, in addition to achieving the effects of each of the embodiments described above, the restraining layer 5 as a mass is provided, so that the shear strain of the polymer material 3 due to vibration from the vibration surface is increased. This allows the vibration reduction ability to be further improved.

In the structure shown in FIG. 5 as well, by using a high t0 loss polymer material or a magnetic polymer material as described above as the polymer material 3, the same effect as described above can be obtained, and the damping effect can be further improved. -1- can be achieved.

FIGS. 6 and 7 are a plan view and a sectional view illustrating the case where the magnetic damper according to the present invention is applied to a gear.

In FIGS. 6 and 7, the side surface of the gear 6 made of magnetic material such as iron (in the illustrated example, the part near the outer tooth profile 7)
An annular groove 8 is formed in the groove 8, and a magnetic damper 1, which is formed into a belt shape or a ring shape in advance, is attached within the groove 8.

In the illustrated example, a large number of permanent magnets 2 are connected to a chain 4 using a polymeric material 3.
Although a composite magnetic damper 1 connected to k is attached to the entirety of one annular a8, the arrangement of this magnetic damper 1 can be appropriately selected as necessary.

According to the magnetic damper 1 described above, vibration or noise can be effectively reduced by adhering to a vibrating surface made of a magnetic material such as iron.

Next, an experimental example of the magnetic damper according to the present invention will be explained.

Figure 8 shows the test equipment, Figure 9 shows the test sample, and Figure 10 shows the test equipment.
The figures show the test results, respectively.

In Figure 8, the medium is 25 mm, -JU is 300 ml.
, an iron plate 11 with a thickness of 5 xwr is used as a vibrating body, and this is used as a string 1
2, and the pendulum 13 collided with the back surface of the iron plate 11 to apply an impact force F.

A microphone 14 installed in front of the iron plate 11 makes a sound, and the frequency is analyzed by a real-time analyzer 16 via a microphone amplifier 15, and a hard copy 17 is generated.
The sound pressure level was recorded.

In Figure 9, the test samples are Sample A, which has only an iron plate, Sample B, which has a single ferrite permanent magnet adsorbed on the front surface of the iron plate, and Sample B, which has a composite ferrite permanent magnet connected with rubber. Four types were adopted: Sample C, which had a composite ferrite permanent magnet connected with magnetic rubber, and Sample D, which had a magnetic damper made of a composite of ferrite permanent magnets connected with magnetic rubber and attached to the front surface of the iron plate.

As the ferrite permanent magnets in Samples B, C, and D, cylindrical magnets with a diameter of IQ mm and a height of 5 inches were used, and eight of them were arranged at equal intervals.

Of these test samples A-D, as is clear from their structures, samples C and D are products of the present invention, and the others are comparative (or conventional) samples.

FIG. 10 is a graph showing the measurement results of the sound pressure level when these test samples A to D were vibrated using the testing apparatus of FIG. 8.

The horizontal axis of this graph represents the octave band center frequency [1], the vertical axis represents the sound pressure level (dBC), and each line in the graph represents the measured value of each test sample. That is, polyline A is sample A (comparative product), polyline B is sample B (conventional product), and polyline C is sample C (inventive product).
, the broken line indicates the measurement results of sample D (product of the present invention).

As is clear from the test results, it was confirmed that by adhering the magnetic damper of the present invention to the surface of the vibrating body, the allocation ability was significantly improved.

〔effect〕

As is clear from the above description, according to the present invention, it is possible to obtain a magnetic damper that can exhibit excellent vibration damping effects and has excellent impact resistance.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic damper according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG.
FIG. 3 is a plan view of a magnetic damper according to another embodiment of the present invention, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a further embodiment of the present invention. FIG. 6 is a plan view showing an example of use of the magnetic damper according to the present invention applied to a gear, and FIG. 7 is a cross-sectional view of a portion corresponding to FIG. 2 or FIG. A cross-sectional view taken along the line ■-■, Figure 8 is an explanatory view illustrating a test device for measuring the allocation ability of a magnetic damper, and Figure 9 is a longitudinal cross-sectional view showing various test samples of magnetic dampers used in comparative tests. , FIG. 10 is a graph showing the results of testing the test sample of FIG. 9 using the testing apparatus of FIG. 8. 1----Magnetic damper, 2--Permanent magnet,
3-------- one polymeric material, 5---- constraining layer. Agent Patent Attorney Yasushi Ooto - Eyes Figure 8 Figure 6

Claims (4)

[Claims] (1) A magnetic damper characterized by a composite structure in which metallic permanent magnets are connected with a polymeric material such as rubber or plastic. (2) The magnetic damper according to claim 1, wherein the polymer material is a polymer material filled with metal powder, mica, sand, etc. to increase internal loss. (3) The magnetic damper according to claim 1, wherein the polymer material is a polymer material such as a rubber magnet or a plastic magnet made magnetic by mixing iron powder or the like. (4) The feature is that metallic permanent magnets are connected and composited with a polymeric material such as rubber or plastic, and a restraining layer in the form of a plate-like mass of metal, hard rubber, or hard plastic is provided on the surface of the magnet. Magnetic damper.