JPH06280926A - Vibration isolative supporting device - Google Patents

Abstract

PURPOSE:To generate a large damping force by furnishing a cylindrical member on each side of an electrode supporting member provided with orifices, forming a fluid chamber filled with electro-viscous fluid and/or liquid crystal, and adjusting their viscosity through current feeding to the electrode supporting member. CONSTITUTION:Through metal bellows 3, the first cylindrical member 5 is coupled with a part under a support 2 for a vibratory body such as an engine, measuring instrument, or any other equipment or structure, and under this member 5 an electrode supporting member 6 is furnished which is provided with a number of orifices 16 where electrodes 17 are to be installed. Under this member 6, the second cylindrical member 8 and base member 9 are installed with a spacer 7 interposed, and a diaphragm 10 is pinched between the cylindrical member 8 and base member 9. The first and second fluid chambers 18, 18 formed on both sides of this member 6 are filled with electro-viscous fluid, and a voltage in accordance with the result from vibrational sensing is impressed between the electrodes 17, and thereby the viscosity of the electro- viscous fluid between the electrodes 17 is adjusted to control the damping characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is widely used in engines, measuring instruments, computers, and other various devices or structures.
The present invention relates to an anti-vibration support device for damping or insulating vibration of a vibration system.

[0002]

2. Description of the Related Art Conventionally, a working fluid such as oil or air is used as an anti-vibration supporting device, and a piston is provided in a case. The piston forms two fluid chambers in the case. An orifice that connects the chambers is provided,
It is known that an operating shaft fixed to a piston extends inside and outside a case and a vibrating body is connected to the operating shaft.

However, the vibration damping characteristics of the conventional vibration damping support device are fixed depending on the shape of the orifice and the characteristics of the working fluid. Therefore, if the vibration damping device is used in a vibration system that differs from its original design conditions,
Optimal vibration damping characteristics cannot be obtained. Further, when the anti-vibration support device is used in a vibration system in which the vibration state changes with time, a vibration system in which a plurality of vibrations are coupled, or the like, the vibration cannot be effectively damped.

In order to solve the above problem, Japanese Patent Laid-Open No. 4-3
According to Japanese Patent No. 70433, a rubber elastic body is provided between a vibration generating portion and a vibration receiving portion, and two fluid chambers are provided in the rubber elastic body to fill an electrorheological fluid. Electrodes are arranged in a restricted passage that communicates between the fluid chambers, and a voltage is applied between the electrodes to control the viscosity of the electrorheological fluid to make the vibration damping force variable so that vibrations over a wide frequency range can be absorbed.

[0005]

However, in the device disclosed in Japanese Patent Laid-Open No. 4-370433, when the electrorheological fluid passes through the restriction passage, the internal pressure of the fluid chamber expands the rubber elastic body, so that the restriction is restricted. There is a problem that the flow rate of the electrorheological fluid flowing through the passage is reduced, a large damping force cannot be obtained, and the rigidity of the rubber elastic body is greatly changed, which makes design difficult. Further, since the rubber elastic body is fixed by vulcanization adhesion, it cannot be disassembled and reassembled, and the electrorheological fluid cannot be replaced when the electrorheological fluid is deteriorated. I have a problem.

The present invention solves the above problems and provides a large damping force over a wide range of vibration frequencies, is easy to design, and is capable of exchanging electrorheological fluids. It is intended to provide a support device.

[0007]

To this end, the anti-vibration support device of the present invention comprises a support member 2 for supporting a vibrating body, and a first tubular member connected below the support member 2 via a metal bellows 3. 5, an electrode supporting member 6 arranged below the first cylindrical member 5, a second cylindrical member 8 and a base member 9 arranged below the electrode supporting member 6, and a second cylindrical member. 8, a diaphragm 10 sandwiched between the base member 9 and the base member 9, an orifice 16 formed in the electrode supporting member 6, and an orifice 1
6, an electrode 17 arranged so as to oppose to each other, and an electrorheological fluid and / or a liquid crystal filled in the fluid chambers 18 and 19 in the first and second cylindrical members 5 and 8, respectively. It is characterized in that the applied voltage of the electrode 17 is changed to control the damping force and the dynamic rigidity. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings in order to facilitate understanding of the present invention, and the configurations of the present invention are not limited thereby.

[0008]

In the present invention, for example, as shown in FIG.
Vibration of the engine or the like is detected by a vibration detection sensor, a voltage according to the vibration is applied between the electrodes 17, and the orifice 1
An electric field orthogonal to the electrorheological fluid in 6 is formed, and the electrode 1
Since the viscosity of the electrorheological fluid or liquid crystal sandwiched between 7 is adjusted, the vibration damping characteristics can be adjusted very easily. The number of the orifices 16 may be one, but the greater the number, the easier the vibration control. If one or a plurality of anti-vibration supporting devices 1 are arranged on the vibrating body and the vibration damping characteristics are adjusted according to each vibration, the rigidity and the damping force can be varied with respect to the vibration frequency in all ranges. Can be

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a vibration isolation support device of the present invention.

The antivibration support device 1 of the present invention includes a support member 2 for supporting a vibrating body such as an engine, a measuring instrument, a computer, various other devices or structures, and a metal bellows 3 below the support member 2. The first tubular member 5 connected to each other, the electrode supporting member 6 disposed below the first tubular member 5, the spacer member 7 disposed below the electrode supporting member 6, and the second tubular member 5. A member 10 and a base member 9 are provided, and a diaphragm 10 made of an elastic material such as rubber is sandwiched between the second tubular member 8 and the base member 9. O-rings 11, 12, 13, 14 seal the space between the first tubular member 5, the electrode supporting member 6, the spacer member 7, the second tubular member 8 and the base member 9.

The support member 2 is provided with bolts 15 for fixing the vibrating body, the electrode support member 6 is formed with a number of orifices 16, and the orifices 16 are provided with electrodes 17 so as to face the passages. It is arranged. The electrode 17 is
When the outer cylinder 2 and the inner cylinder 3 are made of a metal material, they are provided via an insulating material, and when they are made of an insulating material such as resin, they are provided directly. As the electrodes, a printed wiring board in which copper foil is attached to both surfaces of a polyimide resin may be used. The spacer member 7 is provided to adjust the number of electrodes 17.

A first fluid chamber 18 is formed on the first tubular member 5 side with the electrode support member 6 interposed therebetween, and a second fluid chamber 19 is formed on the second tubular member 8 side. The first and second fluid chambers 18, 19 are filled with the electrorheological fluid.

The operation of the present invention having the above structure will be described. Vibration of the engine or the like is detected by a vibration detection sensor such as an acceleration sensor, and a voltage corresponding to the vibration is applied between the electrodes 17 by an electronic control unit (not shown). Electrode 1
When a voltage is applied between the electrodes 7, an electric field orthogonal to the electrorheological fluid in the orifice 16 is formed, and the viscosity of the electrorheological fluid sandwiched between the electrodes 17 is increased or decreased. Therefore, since the viscous resistance of the fluid passing through the orifice 16 is adjusted, the vibration damping characteristic can be adjusted very easily. In addition, the spring constant of the metal bellows 3 is tuned so as to absorb the primary vibration when no voltage is applied (for example, the thickness of the metal bellows, selection of material to be used, etc., based on the magnitude of vibration of the vibrating body). If the applied voltage is appropriately controlled, the second or higher order vibration can be easily suppressed.
Further, the volume change due to the movement of the fluid between the first fluid chamber 18 and the second fluid chamber 19 (expansion and contraction of the metal bellows, etc.) is compensated by the deformation of the diaphragm 10.

Further, one or a plurality of the anti-vibration supporting devices 1 are arranged on the vibrating body. By disposing a plurality of anti-vibration support devices 1 on the vibrating body and adjusting the vibration damping characteristics according to the respective vibrations, the rigidity and damping force can be made variable with respect to vibration frequencies in all ranges. it can.

Next, the electrorheological fluid used in this embodiment will be described. The Winslow effect of an electrorheological fluid is disclosed in US Pat. No. 2,417,850, in which solid particles (dispersoids) are suspended between two electrodes in an electrically insulating fluid (dispersion medium). When filled with a turbid material, so-called electrorheological fluid, and applying a voltage between both electrodes,
The effect of the external electric field is to increase the fluid viscosity.
Not only can this viscosity be externally controlled by the magnitude of the external electric field, but the excellent effect of extremely good responsiveness can be expected.

Explaining the embodiment of the electrorheological fluid, the electrically insulating fluid as the dispersion medium may be any electrically insulating fluid and is not subject to any special limitation. For example, mineral oil or synthetic oil may be used. Yes, more specifically, naphthene-based mineral oil, paraffin-based mineral oil, polyalpha-olefin, polyalkylene glycol, silicone, diester, polyol ester, phosphate ester, silicon compound, fluorine compound, polyphenyl ether, alkylbenzene, synthetic hydrocarbon. And so on. The viscosity range of these electrically insulating fluids is 5 to 300 CP at 40 ° C.
Are preferred.

Further, the porous solid particles as the dispersoid are
Commonly used ones are not particularly limited, and examples thereof include silica gel, hydrous resin, diatomaceous earth, alumina, silica-alumina, zeolite, ion exchange resin, and cellulose. These porous solid particles are
Usually, a particle size of 10 nm to 200 μm is 0.1 to 50
Used in percentage by weight.

Further, in order to enhance the polarization promoting effect, water,
A polarization accelerator such as polyhydric alcohol, acid, salt or base is added. In particular, it is preferable to use the porous solid particles, which are dispersoids, in a mode that facilitates dielectric polarization. Examples of the polarization promoting agent include polyhydric alcohols and partial derivatives thereof. As polyhydric alcohol, dihydric alcohol,
Trihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerin,
Examples thereof include propanediol, butanediol, pentanediol, hexanediol and the like. Examples of preferable polyhydric alcohols include triethylene glycol and tetraethylene glycol.

Further, the partial derivative of polyhydric alcohol is a partial derivative of polyhydric alcohol having at least one hydroxyl group, and some of the terminal hydroxyl groups of the above polyhydric alcohol are methyl group, ethyl group and propyl group. , Partial ethers substituted with an alkyl-substituted phenyl group (the number of carbon atoms in the alkyl group substituted with a phenyl group is 1 to 25), etc., and some of the terminal hydroxyl groups are esters with acetic acid, propionic acid, butyric acid, etc. And partial esters thereof. These polyhydric alcohols or partial derivatives thereof are usually used in an amount of 1 wt% to 100% based on the porous solid particles.
wt%, particularly preferably 2 wt% to 80 wt% may be used. If the addition amount is less than 1 wt%, the ER effect is small, and if it exceeds 100 wt%, the current easily flows, which is not preferable. The amount of water or polyhydric alcohol used is usually 1 to 100% by weight with respect to the porous solid particles.

Next, the acid, salt and base components will be described. As the acid component, sulfuric acid, hydrochloric acid, nitric acid, perchloric acid, chromic acid, phosphoric acid, inorganic acids such as boric acid, or acetic acid, formic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, oxalic acid, malonic acid, etc. Organic acids are used. The salt is a compound composed of a metal or a basic group (NH ₄ ⁺ , N ₂ H ₅ ^+, etc.) and an acid group, and any of these can be used. Among them, polyhydric alcohols, those which dissolve in the system of polyhydric alcohol partial derivatives and dissociate, for example, alkali metals,
Those that form typical ionic crystals such as halides of alkaline earth metals, or alkali metal salts of organic acids are preferable. LiCl, NaC as this kind of salt
1, KCl, MgCl ₂ , CaCl ₂ , BaCl ₂ , L
iBr, NaBr, KBr, MgBr ₂ , LiI, Na
I, KI, AgNO ₃ , Ca (NO ₃ ) ₂ , NaNO ₂ ,
NH ₄ NO ₃ , K ₂ SO ₄ , Na ₂ SO ₄ , NaHSO ₄ ,
(NH ₄ ) ₂ SO ₄ or alkaline metal salts of formic acid, acetic acid, oxalic acid, succinic acid and the like.

Examples of the base include alkali metal or alkaline earth metal hydroxides, alkali metal carbonates, amines, etc., and polyhydric alcohols, polyhydric alcohol partial derivatives, or polyhydric alcohols and / or polyhydric alcohols. Those that dissolve in the system of the alcohol partial derivative and water to dissociate are preferable. As this kind of base, NaOH, KOH, Ca
(OH) ₂ , Na ₂ CO ₃ , NaHCO ₃ , K ₃ PO ₄ , N
a ₃ PO ₄ , aniline, alkylamine, ethanolamine and the like. In addition, the salt and the base may be used in combination.

The above-mentioned acids, salts and bases are capable of increasing the polarization effect, but when used in combination with a polyhydric alcohol and / or a polyhydric alcohol partial derivative, the polarization effect is further enhanced. The total amount of electrorheological fluid is 0.01 wt% to 5w.
It is preferable to use it at a ratio of t%. If it is less than 0.01 wt%, the ER effect is small, and if it exceeds 5 wt%, it becomes easy to energize and power consumption increases, which is not preferable.
When an acid, salt, or base component is added to the electrorheological fluid of this example, it is necessary that the partial esterified product of the polyhydric alcohol is not hydrolyzed.

Further, a dispersant is used to make the dispersion state of the porous solid particles in the dispersion medium uniform and stable. For example, sulfonates, phenates, phosphonates, succinimides, amines, esters, nonionic dispersants and the like are used, and specifically, magnesium sulfonate, calcium sulfonate, calcium phenate, calcium phosphonate, Examples include polyisobutenyl succinimide, sorbitan monooleate, and sorbitan sesquioleate. These are usually 0.1
Used in a proportion of ~ 15% by weight. However, the dispersant may not be used when the solid particles have good dispersibility. Further, additives such as an antioxidant, an antiwear agent, a corrosion inhibitor, a friction modifier, an extreme pressure agent, and an encapsulating agent may be blended.

In the embodiment of the present invention, an electrorheological fluid comprising alkylbenzene as a dispersion medium, silica gel as a dispersoid, and triethylene glycol as a polarizing agent is used.
Polybutenyl succinimide is added as a dispersant, and 2.6-di-t-butylphenol is added as an antioxidant.

Next, another embodiment of the present invention will be described. In this embodiment, liquid crystal is used instead of the electrorheological fluid, and when a voltage is applied between the electrodes 17, an electric field orthogonal to the liquid crystal in the orifice 16 is formed, and the direction of liquid crystal molecules sandwiched between the electrodes 17 and Since the state of the arrangement or the like is changed and the viscosity of the liquid crystal is increased or decreased, the same effect as the electrorheological fluid is obtained.

As the liquid crystal used in the present invention, a commercially available product may be used, for example, azo type, azoxy type, benzoic acid phenyl ester type, cyanobiphenyl type, cyanoterphenyl type, cyclohexylcarboxylic acid phenyl ester type,
Phenylcyclohexane system, biphenylcyclohexane system, phenylpyrimidine system, phenyldioxane system, cyclohexylcyclohexane ester system, cyclohexylethane system, cyclohexene system, alkylalkoxytran system, alkenyl system, 2,3-difluorophenylene system, cyclohexylcyclohexane system, bicyclooctane system It is possible to use liquid crystals of the system, cubane system, dicyanohydroquinone system, cyanothiophenyl ester system, azomethine system and the like. However, for azomethine type,
It is not preferable because it has little stability and thickening effect. If necessary, additives such as an antioxidant, an antiwear agent, a corrosion inhibitor, and a friction modifier may be added. The above liquid crystals may be used alone or in combination. Preferably, various liquid crystal substances are mixed and used in order to improve liquid crystal characteristics. An example of a concrete liquid crystal is the product name RDX
A liquid crystal of -4069 (manufactured by Rodick) was used.

In this embodiment, since the applied voltage is small as compared with the above-mentioned embodiment using the electrorheological fluid, local damage due to discharge or the like is reduced, the life of the device is extended, and the interval between the electrodes is narrowed. The size of the device can be reduced, and the battery can be used as a power source. Since there is no concern about sedimentation of solid particles and the like, there is no decrease in the thickening effect and clogging of the filter. Since the effect of the shear rate is small, it is easy to control, and it is difficult to deteriorate.

Incidentally, the electrorheological fluid and the liquid crystal may be combined.

[0029]

As is apparent from the above description, according to the present invention, since the metal bellows is used, the expansion due to the internal pressure unlike the conventional rubber elastic body is small, so that the flow rate to the electrode is reduced. Is reduced, and a large damping force can be obtained for a wide range of vibration frequencies. Further, since the change in rigidity is small, the design is easy, and since the metal bellows can be disassembled and reassembled, the electro-rheological fluid and the liquid crystal can be replaced when they deteriorate and the life can be extended.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an anti-vibration support device of the present invention.

[Explanation of symbols]

2 ... Support member, 3 ... Metal bellows, 5 ... First tubular member,
6 ... Electrode support member 8 ... 2nd cylinder member, 9 ... Base member, 10 ... Diaphragm, 16 ... Orifice 17 ... Electrode, 18, 19 ... Fluid chamber

Claims (1)

[Claims] 1. A support member for supporting a vibrating body, a first tubular member connected to the lower portion of the support member via a metal bellows, and an electrode support provided below the first tubular member. A member, a second tubular member and a base member disposed below the electrode supporting member, a diaphragm sandwiched between the second tubular member and the base member, and the electrode supporting member. And an electrode disposed so as to face the orifice, and an electrorheological fluid and / or liquid crystal filled in the first and second cylindrical members, the An anti-vibration support device characterized by controlling an applied voltage.