JPH0560167A - Damping and supporting device - Google Patents

Abstract

PURPOSE:To vary rigidity and damping force for the vibration frequency in all ranges. CONSTITUTION:A damping and supporting device comprises a supporting member 2 to support a vibration body, a first cylindrical member 5 connected below the supporting member 2 through a bellows 3 and spring 4, the electrode supporting member 6 arranged to the lower part of the first cylindrical member 5, the second cylindrical member 8 and base member 9, which are arranged to the lower part of the electrode supporting member 6, the diaphragm 10 held between the second cylindrical member 8 and the base member 9, and the orifice 16 formed on the electrode supporting member 6. In addition, it is provided with the electrode 17 arranged at a position opposing to the orifice 16, electroviscous fluid or the liquid crystal to be charged in the fluid chambers 18 and 19 in the first and second cylindrical members 5 and 8, controlling the impression voltage of the electrode 17 according to the state of vibration.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a vibration-isolating support device, a working fluid such as oil or air is used, 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, when the vibration damping device is used in a vibration system different from the original design conditions, optimum vibration damping characteristics cannot be obtained. Further, when the anti-vibration support device is used in a vibration system in which a vibration state changes with time, a vibration system formed by coupling a plurality of vibrations, or the like, the vibration cannot be effectively damped.

In order to solve the above problem, a case having two fluid chambers is filled with an electrorheological fluid, an electrode is arranged at an orifice portion communicating between the two fluid chambers, and a voltage is applied between the electrodes. An anti-vibration support device has been proposed which controls the viscosity of an electrorheological fluid to make the damping force variable (for example, Japanese Patent Laid-Open No. 1-266334).

[0004]

By the way, in the case of anti-vibration of an engine mounted on a vehicle, for example, in order to reduce the vibration and noise generated from the engine and propagating in the vehicle, a support portion of the engine is used. It is effective to use a support device with low vertical rigidity and low damping to isolate the vibration, but when there is disturbance from the passing road surface or fluctuations in the rotational speed due to rapid acceleration / deceleration. The vibration frequency changes, and a support device having a high rigidity and a high damping characteristic is required temporarily, and it is possible to reduce vibration and noise to a considerable extent. However, the conventional vibration-damping support device using the viscous fluid has a problem that the vibration damping characteristic cannot be obtained because it has a damping effect only for a vibration frequency in a very narrow range.

An object of the present invention is to solve the above-mentioned problems, and an object thereof is to provide an anti-vibration support device capable of varying rigidity and damping force with respect to vibration frequencies in all ranges.

[0006]

To this end, the vibration-damping support device of the present invention comprises a support member 2 for supporting a vibrating member, and a first support member 2 connected below the support member 2 via a bellows 3 and a spring 4. The tubular member 5, the electrode supporting member 6 disposed below the first tubular member 5, the second tubular member 8 and the base member 9 disposed below the electrode supporting member 6, and the second tubular member 8 A diaphragm 10 sandwiched between the tubular member 8 and the base member 9 and an orifice 16 formed in the electrode support member 6.
And the electrode 1 arranged so as to face the orifice 16.
7, and a fluid chamber 18 in the first and second tubular members 5 and 8,
It is characterized in that it is provided with an electrorheological fluid filled in 19 and controls the voltage applied to the electrode 17 according to the state of vibration.
Liquid crystal may be used instead of the electrorheological fluid. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings for easy understanding, and the configurations of the present invention are not limited thereby.

[0007]

In the present invention, for example, as shown in FIG.
In the vibration of the engine or the like, a voltage corresponding to the vibration is applied between the electrodes 17 to form an electric field orthogonal to the electrorheological fluid in the orifice 16, and the viscosity of the electrorheological fluid or the liquid crystal sandwiched between the electrodes 17 is changed. Since it can be adjusted, the vibration damping characteristics can be adjusted very easily. Orifice 16
The number may be one, but the larger the number, the easier the image stabilization control.
A large number of the vibration isolating support devices 1 are arranged on the vibrating body, and if the vibration damping characteristics are adjusted according to the respective vibrations, the rigidity and damping force can be varied with respect to vibration frequencies in all ranges. can do.

[0008]

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 the anti-vibration support device of the present invention.

The vibration-damping support device 1 of the present invention comprises a support member 2 for supporting a vibrating body such as an engine, and a first cylindrical member 5 connected below the support member 2 via a bellows 3 and a spring 4. An electrode supporting member 6 arranged below the first cylindrical member 5, a spacer member 7 arranged below the electrode supporting member 6, a second cylindrical member 8 and a base member 9, 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, and 14 seal the spaces 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 a vibrating body such as an engine, and the electrode support member 6 is provided with a large number of orifices 16.
An electrode 17 is arranged in the channel so as to face the passage.
The electrode 17 is provided via an insulating material when the outer cylinder 2 and the inner cylinder 3 are made of a metal material, and is directly provided when it is made of an insulating material such as resin. As the electrodes, a printed wiring board in which copper foil is attached to both sides 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 according 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 that is orthogonal to the electrorheological fluid in the orifice 16 is formed, and the electrode 17
The viscosity of the electrorheological fluid sandwiched between them will be 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. If the spring constant of the spring 4 is tuned so as to absorb the primary vibration when no voltage is applied and the applied voltage is appropriately controlled, it is possible to easily suppress the secondary or higher vibration. The bellows 3 is provided around the spring 4 and has a role of preventing fluid leakage, while correcting the volume change of the fluid chamber 18 corresponding to the bending of the spring 4 due to the load of the vibrating body.

Further, if a large number of the vibration isolation supporting devices 1 are arranged on the vibrating body and the vibration damping characteristics are adjusted according to the respective vibrations, the rigidity and the vibration frequency in all ranges are improved. The damping force can be made variable.

Next, the electrorheological fluid, which is essential to the construction of the present invention, 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 liquid (dispersion medium). Filling with a turbid material, so-called electrorheological fluid, and applying a voltage between both electrodes results in an increase in fluid viscosity due to the effect of an external electric field. 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 liquid as the dispersion medium may be any electrically insulating material and is not particularly limited. For example, mineral oil or synthetic oil may be used. Yes, more specifically, naphthenic mineral oil, paraffinic 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 liquids 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 a percentage by weight.

In order to enhance the polarization promoting effect, water,
A polarization promoter 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.

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 of 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 their partial derivatives 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.

As the salt, a metal or a basic group (N
H 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 a system of polyhydric alcohol partial derivatives and dissociate, for example, those which form typical ionic crystals such as alkali metal and halides of alkaline earth metals,
Alternatively, alkali metal salts of organic acids and the like are preferable. LiCl, NaCl, KCl, MgCl, etc.
₂ , CaCl ₂ , BaCl ₂ , LiBr, NaBr, K
Br, MgBr ₂ , LiI, NaI, KI, AgN
O 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
Alternatively, there are metal salts of alkali acids such as formic acid, acetic acid, oxalic acid and succinic acid.

Examples of the base include hydroxides of alkali metals or alkaline earth metals, carbonates of alkali metals, 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. The above-mentioned salt and base can 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.
Further, 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 dispersed 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 at a rate of ~ 15% by weight. However, the dispersant may not be used when the dispersibility of the solid particles is good.

Further, additives such as an antioxidant, an antiwear agent, a corrosion inhibitor, a friction modifier, an extreme pressure agent and an anti-packaging agent may be added.

In the embodiment of the present invention, an electrorheological fluid composed of alkylbenzene as a dispersion medium, silica gel as a dispersoid, and triethylene glycol as a polarizing agent,
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 the present 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 liquid crystal molecules sandwiched between the electrodes 17 are formed. Since the state such as the direction and the arrangement is changed and the viscosity of the liquid crystal is increased or decreased, the same effect as that of the electrorheological fluid is obtained.

The liquid crystal used in the present invention may be a commercially available product, 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 a liquid crystal of a system, a cubane system, a dicyanohydroquinone system, a cyanothiophenyl ester system, an azomethine system, or the like.

However, the azomethine type is stable,
It is not so preferable because the thickening effect is small. Further, 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 as a mixture. Preferably, various liquid crystal substances are mixed and used in order to improve liquid crystal characteristics. As a concrete example of the liquid crystal, a trade name RDX-4069
A liquid crystal (manufactured by Rodick) was used.

In this embodiment, the following effects are obtained as compared with the above-mentioned embodiment using the electrorheological fluid. Since the applied voltage is small, local damage due to discharge etc. is reduced and the life of the device is extended, the gap between the electrodes can be narrowed and the device can be downsized, and the battery can be used as a power source. Becomes

Since there is no concern about sedimentation of solid particles,
No decrease in thickening effect and clogging of filter. Control is easy because the effect of shear rate is small. Hard to deteriorate.

[0032]

As is apparent from the above description, according to the present invention, a support member for supporting a vibrating body and a first member connected below the support member via a bellows and a spring are provided.
Tubular member, an electrode supporting member disposed below the first tubular member, a second tubular member and a base member disposed below the electrode supporting member, and a second tubular member A diaphragm sandwiched between a base member and a base member, an orifice formed in the electrode support member, an electrode arranged so as to face the orifice, and the first and second cylindrical members are filled. Since the electro-rheological fluid or liquid crystal described above is provided and the voltage applied to the electrodes is controlled according to the state of vibration, the rigidity and damping force can be made variable with respect to vibration frequencies in all ranges.

[Brief description of drawings]

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

[Explanation of symbols]

2 ... Support member, 3 ... Bellows, 4 ... Spring, 5 ... First tubular member 6 ... Electrode support member, 8 ... Second tubular member, 9 ... Base member, 10 ... Diaphragm 16 ... Orifice, 17 ... Electrode, 18, 19 ... Fluid chamber

Claims (2)

[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 bellows and a spring, and an electrode disposed below the first tubular member. A supporting member and a second member disposed below the electrode supporting member
Tubular member and base member, a diaphragm sandwiched between the second tubular member and the base member, an orifice formed in the electrode support member, and an electrode arranged so as to face the orifice. And an electrorheological fluid filled in the first and second cylindrical members, and controlling the voltage applied to the electrode according to the state of vibration. 2. A support member for supporting a vibrating body, a first tubular member connected below the support member via a bellows and a spring, and an electrode arranged below the first tubular member. A supporting member and a second member disposed below the electrode supporting member
Tubular member and base member, a diaphragm sandwiched between the second tubular member and the base member, an orifice formed in the electrode support member, and an electrode arranged so as to face the orifice. And a liquid crystal filled in the first and second cylindrical members, and the applied voltage to the electrodes is controlled according to the vibration state.