EP0453114A1 - Hydraulische Flüssigkeiten für Kraftfahrzeugaufhängungen - Google Patents

Hydraulische Flüssigkeiten für Kraftfahrzeugaufhängungen Download PDF

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Publication number
EP0453114A1
EP0453114A1 EP91302749A EP91302749A EP0453114A1 EP 0453114 A1 EP0453114 A1 EP 0453114A1 EP 91302749 A EP91302749 A EP 91302749A EP 91302749 A EP91302749 A EP 91302749A EP 0453114 A1 EP0453114 A1 EP 0453114A1
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EP
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Prior art keywords
viscosity
fluid
oil
hydraulic
hydraulic fluids
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EP91302749A
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English (en)
French (fr)
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EP0453114B1 (de
Inventor
Koji Takemitsu
Kenyu Akiyama
Hiroshi Ohashi
Syoichi E1104 Lions Mansion Ueda Bldg. Ichikawa
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Tonen General Sekiyu KK
Toyota Motor Corp
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Tonen Corp
Toyota Motor Corp
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    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/08Hydraulic fluids, e.g. brake-fluids

Definitions

  • the present invention relates to hydraulic fluids for automobile suspensions, and especially to hydraulic fluids are suitable for use in hydraulic power units adapted to perform leveling control of automobiles by using a hydraulic oil and have such excellent hydraulic response characteristics as permitting accurate leveling control. More specifically, the present invention is concerned with hydraulic fluids for automobile suspensions, said fluids comprising as a base oil a mixed oil of an olefin oligomer and a diester and hence being of the synthetic lubricating oil base and having excellent hydraulic response characteristics.
  • Suspensions for automobile bodies include those having hydraulic rams arranged near respective wheels instead of spring dampers whereby the rams are driven by hydraulic pressure from a pressure accumulator to stably control the spatial orientation of the automobile bodies; in other words, to perform stable leveling control of the automobile bodies.
  • Hydraulic fluids for suspensions of the above type are required to have as their basic properties desirable viscosity at high temperatures and preferable fluidity at low temperatures, namely, good viscosity-temperature characteristics in view of the severe use environments of automobiles.
  • Known conventional hydraulic fluids for automobile suspensions include those containing as a base oil a low-viscosity mineral oil having excellent low-temperature fluidity and as a viscosity index improver a large amount of polymethacrylate (PMA) to impart desired viscosity-temperature characteristics.
  • PMA polymethacrylate
  • An object of the present invention is to provide a hydraulic fluids for automobile suspensions, which has good viscosity-temperature characteristics, improved inflammability, evaporation resistance, antiseizure property, shear stability and the like and retains good hydraulic response over a long period of time.
  • the present inventors have proceeded with an intensive investigation to overcome the above-described problems of the conventional techniques. As a result, it was found that the above objects can be attained by using, as a base oil, a synthetic lubrication oil which has been obtained by mixing an olefin oligomer and a diester at a particular ratio, leading to the completion of the present invention.
  • a hydraulic fluid for automobile suspensions which comprises, as a base oil, a mixed oil which in turn comprises (a) 70-90 wt.% of an olefin oligomer and (b) 10-30 wt.% of a diester obtained by condensation of an aliphatic dibasic acid having 4-14 carbon atoms and an alcohol having 4-14 carbon atoms.
  • a hydraulic fluids for automobile suspensions which comprises the above base oil, a phosphoric ester friction modifier and a viscosity index improver.
  • the hydraulic fluids for automobile suspensions - which pertains to the present invention - is used, as described above, in hydraulic units adapted to perform leveling control of a vehicle body by using hydraulic pressure rather than the conventional suspension system that uses spring dampers.
  • a leveling control method of this type information on road surface conditions is obtained at a rate of several thousands/second, for example, 3,000 pieces/second by means of sensors, and leveling control is performed in accordance with the information.
  • a hydraulic fluid which is employed as a suspension oil for applications of the above-described kind desirably has, in view of the environmental conditions of use of automobiles, good high-temperature viscosity characteristics, specifically a kinematic viscosity of usually 2-15 mm2/s, preferably 4-10 mm2/s at 100°C and good low-temperature viscosity characteristics (low-temperature fluidity), particularly a viscosity of normally 400-2,400 mPa ⁇ s, preferably 500-2,000 mPa ⁇ s at -40°C. It is also desirable that the hydraulic fluid has a viscosity index (V.I.) of normally at least 200, preferably at least 250. Further, as fundamental characteristics of hydraulic fluids for suspensions, the hydraulic fluid must be excellent in inflammability resistance, evaporation resistance, anti-seizure property, shear stability and the like.
  • Hydraulic fluids excellent in such various properties can be provided by using, as a base oil, a mixed oil which contains (a) 70-90 wt.% of an olefin oligomer and (b) 10-30 wt.% of a diester obtained by condensation of an aliphatic dibasic acid having 4-14 carbon atoms and an alcohol having 4-14 carbon atoms.
  • a base oil a mixed oil which contains (a) 70-90 wt.% of an olefin oligomer and (b) 10-30 wt.% of a diester obtained by condensation of an aliphatic dibasic acid having 4-14 carbon atoms and an alcohol having 4-14 carbon atoms.
  • the olefin oligomer employed in the present invention is obtained by homopolymerization of a desired olefinic hydrocarbon or copolymerization of desired two or more olefinic hydrocarbons selected from linear or branched olefinic hydrocarbons having usually 2-14 carbon atoms, preferably 4-12 carbon atoms.
  • the olefin oligomer has a kinematic viscosity of usually 1-130 mm2/s, preferably 1.5-25 mm2/s at 100°C. Its average molecular weight is usually in the range of from about 100 to about 2,000, preferably in the range of from about 200 to about 1,000.
  • olefin oligomers for use in the present invention olefin oligomers whose unsaturated bonds have been saturated by hydrogenation are particularly preferred.
  • Illustrative olefin oligomers include ⁇ -olefin oligomers, ethylene/ ⁇ -olefin oligomers, and the like.
  • the ⁇ -olefin oligomers include mixtures of ⁇ -olefin oligomers having 6-12 carbon atoms, said mixtures being available by trimerization to hexamerization of hydrocarbons or lower olefins, for example, that obtained by copolymerization of a mixture consisting of 25-50 wt.% of hexene-1, 30-40 wt.% of octene-1 and 25-40 wt.% of decene-1.
  • Olefin oligomers available from the single use of monomers such as decene-1 and hydrogenation products thereof are also suitable.
  • Examples of the ethylene/ ⁇ -olefin oligomers include that obtained by copolymerization of 40-90 wt.% of ethylene and 10-60 wt.% of propylene.
  • olefin oligomers can be produced using, as a catalyst, a Friedel-Crafts catalyst such as aluminum chloride or boron fluoride, a Ziegler catalyst, an oxide catalyst such as chromium oxide, or the like.
  • Hydrogenation of an olefin oligomer can be conducted by bringing a polymerization reaction product into contact with hydrogen in the presence of a hydrogenation catalyst, for example, nickel-molybdenum/alumina under elevated temperature and pressure.
  • the diester employed in the present invention is a diester obtained by dehydrating condensation of an aliphatic dibasic acid having 1-14 carbon atoms and an alcohol having 4-14 carbon atoms.
  • the diester generally has a kinematic viscosity of 2-7 mm2/s at 100°C.
  • Illustrative aliphatic dibasic acids having 4-14 carbon atoms include succinic acid, glutaric acid, adipic acid, piperic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassilic acid and tetradecanedioic acid.
  • succinic acid glutaric acid, adipic acid, piperic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassilic acid and tetradecanedioic acid.
  • adipic acid, azelaic acid and sebacic acid with adipic acid and sebacic acid being particularly preferred.
  • Examples of the alcohols having 4-14 carbon atoms include n-butanol, isobutanol, n-amyl alcohol, isoamyl alcohol, n-hexanol, 2-ethylbutanol, cyclohexanol, n-heptanol, isoheptanol, methylcyclohexanol, n-octanol, dimethylhexanol, 2-ethylhexanol, 2,4,4-trimethylpentanol, isooctanol, 3,5,5-trimethylhexanol, isononanol, isodecanol, isoundecanol, 2-butyloctanol, tridecanol and isotetradecanol. Of these, 2-ethylhexanol and isodecanol are particularly preferred.
  • Diesters which can be obtained from these aliphatic dibasic acids and alcohols include, for example, di(1-ethylpropyl) adipate, di(3-methylbutyl) adipate, di(1,3-methylbutyl) adipate, di(2-ethylhexyl) adipate, di(isononyl) adipate, di(isodecyl) adipate, di(undecyl) adipate, di(tridecyl) adipate, di(isotetradecyl) adipate, di(2,2,4-trimethylpentyl) adipate, di(mixed (2-ethylhexyl, isononyl)] adipate, di(1-ethylpropyl) azelate, di(3-methylbutyl) azelate, di(2-ethylbutyl) azelate, di(2-e
  • diesters have a kinematic viscosity of usually 2-7 mm2/s, preferably 2.2-6 mm2/s at 100°C.
  • An unduly low kinematic viscosity poses problems on inflammability, evaporation and load carrying capacity, whereas an unduly high kinematic viscosity results in a high viscosity at low temperatures and hence impairs low-temperature fluidity.
  • the base oil of the hydraulic fluid according to the present invention which is suitable for use in automobile suspensions, contains a mixed oil of the olefin oligomer and diester described above.
  • the proportion of the olefin oligomer is 70-90 wt.%, preferably 75-90 wt.%, more preferably 80-85 wt.% while the proportion of the diester is 10-30 wt.%, preferably 10-25 wt.%, more preferably 15-20 wt.%.
  • Use of the mixed oil of the above mixing ratio as a base oil makes it possible to satisfy the above-described characteristics required for hydraulic fluids for automobile suspensions, namely, to provide a hydraulic fluid having good viscosity-temperature characteristics and improved in inflammability, evaporation, anti-seizure property, shear stability and the like.
  • the base oil employed in the present invention may be added with one or more other lubricating oils such as mineral oil.
  • the hydraulic fluid of the present invention for use in automobile suspensions may retain good low-temperature viscosity characteristics at -40°C even when a mineral-oil-based hydraulic fluid is added in a proportion lower than 50 wt.%.
  • the present invention permits addition of various additives to the base oil which contains the mixed oil of the olefin oligomer and the diester.
  • these additives particularly preferred are a phosphoric ester friction modifier and a viscosity index improver.
  • the hydraulic working oil of this invention for use in suspensions can be added with at least one friction modifier selected from phosphate esters, phosphite esters and amine salts thereof, especially phosphate ester amine salts.
  • Phosphate esters are used to improve the friction characteristics and antiwear characteristics especially in an initial stage, namely, during the running-in period, while phosphite esters are employed to retain low friction characteristics over a long period of time especially after the running-in period.
  • Phosphate ester amine salts have similar properties to phosphite esters and can retain good friction characteristics over a still longer period than the phosphite esters although their friction characteristics are somewhat higher than the phosphite esters.
  • R1, R2 and R3 are the same or different and are independently a saturated or unsaturated alkyl group having at least 4 carbon atoms, an aryl group or an alkyl-substituted aryl group.
  • phosphoric ester friction modifiers include oleyl acid phosphate [mixture of (C18H35O)P(OH)2O and (C18H35O)2P(OH)O] and dioleyl hydrogenphosphite [(C18H35O)2P(OH)].
  • Phosphoric ester amine salts are reaction products of phosphate esters or phosphite esters and amine compounds.
  • the amine compounds include primary or secondary amines which contain one or two saturated or unsaturated alkyl groups having 10-20 carbon atoms.
  • Diisooctyl acid phosphate amine salt (reaction product of (i-C8H17O)2P(OH)O and (C18H35)NH2] can be mentioned as a specific example.
  • the mixing proportion of the phosphoric ester friction modifier may generally range from 0.01 wt.% to 5 wt.%, with the range of 0.05-2 wt.% being preferred. Within this range of mixing proportions, good friction characteristics and antiwear characteristics can be obtained. It is to be noted that combined use of two or more of these friction modifiers is preferred with a view toward retaining good friction characteristics and antiwear characteristics not only in an initial stage but also over a long period of time.
  • Polymethacrylate (PMA) of a relatively high molecular weight has been incorporated as a viscosity index improver in conventional mineral-oil-base hydraulic fluids to obtain good viscosity-temperature characteristics.
  • the base oil employed in the present invention exhibits by itself good viscosity-temperature characteristics so that addition of PMA having a weight average molecular weight of about 20,000-200,000, preferably at least 20,000 but lower than 100,000, more preferably 30,000-90,000 can improve the viscosity-temperature characteristics of the hydraulic fluid further.
  • PMA having a relatively low molecular weight lower than 100,000 has superior shear stability to PMA of a high molecular weight and can improve both the viscosity-temperature characteristics and shear stability of the hydraulic fluid of the present invention.
  • These viscosity index improvers can be added in a proportion of generally 5-30 wt.%, preferably 10-25 wt.%.
  • PIB polyisobutylene
  • EPC ethylene-propylene copolymer
  • SPC hydrogenated products of styrene-butadiene copolymers
  • additives commonly employed in lubrication oils for example, ashless dispersants, metal deactivators, antioxidants, defoaming agents, rust preventives, metal detergents and the like can be added to the hydraulic working oil of the present invention for automobile suspensions to extents not impairing the objects of the present invention.
  • Ashless dispersants are used to disperse the phosphoric ester friction modifier, any deterioration products of the hydraulic fluid, etc. in the oil.
  • the ashless dispersants include succinimide-, succinamide-, benzylamine- and ester-based, ashless dispersants. ,These ashless dispersants are used generally in a proportion of 0.05-1 wt.%.
  • Metal deactivators are employed to prevent corrosion of metals by any oxidation or thermal deterioration products of the oil or to avoid dissolution of metals into the base oil. They include, for example, thiadiazole-based and triazole-based metal deactivators. They can be used generally in a proportion of 0.01-0.5 wt.%
  • antioxidants conventional antioxidants such as amine-based antioxidants and phenol-based antioxidants can be used.
  • Illustrative amine-based antioxidants include alkylated diphenylamines, phenyl- ⁇ -naphthylamines and alkylated- ⁇ -naphthylamines
  • examples of phenol-based antioxidants include 2,6-di-t-butylphenol and 4,4′-methylenebis(2,6-t-butylphenol). They can be used generally in a proportion of 0.05-1 wt.%.
  • defoaming agents such as dimethyl polysiloxane and polyacrylates
  • rust preventives such as alkenyl succinates, their partial esters and alkanol amines
  • metal detergents such as compounds capable of neutralizing oxidation and other deterioration products of the oil - e.g., calcium sulfonates, magnesium sulfonates, barium sulfonates, calcium phenates and barium phenates - can be employed suitably as needed.
  • the hydraulic fluids for automobile suspensions according to the present invention which comprise as an base oil a mixed oil containing an olefin oligomer and a diester, are excellent not only in viscosity-temperature characteristics but also in inflammability, evaporation resistance, anti-seizure property, shear stability and the like.
  • the hydraulic fluids of the present invention are therefore extremely suited for use in hydraulic units adapted to perform leveling control of automobiles, and can exhibit outstanding hydraulic response over a long period of time.
  • Hydraulic fluids for automobile suspensions were prepared by mixing the base oil components with their corresponding various additive components, both shown in Tables 1-4. The proportions of the individual components are shown by wt.%. Incidentally, the wt.% of each additive component is based on the total amount of its corresponding base oil components and additive components, including the first-mentioned additive component.
  • Viscosity index Calculated in accordance with JIS K-2283, from kinematic viscosities measured at 40°C and 100°C respectively, using a Ubbelohde viscometer. The greater the viscosity index, the better the viscosity-temperature characteristics.
  • Low-temperature viscosity Measured the viscosity at -40°C in accordance with ASTM D-2983, using a Brookfield viscometer.
  • Evaporation loss Each hydraulic fluid sample was placed in a metal-made vessel and depressurized to -20 mmH2O by a vacuum pump. The oil sample was then heated at 100°C for 8 hours. The amount of the evaporated oil sample was measured. The wt.% of the evaporated oil sample based on the weight before the heating was calculated. Shear stability: Each hydraulic fluid sample was placed in a glass-made vessel and was then exposed to 10 KHz ultrasonic waves for 30 minutes. The percentage of viscosity reduction after the test was measured. Compatibility with nitrile rubber: Sample pieces of nitrile rubber were immersed in each hydraulic fluid sample at 120°C for predetermined periods of time (70, 140, 280, 560 hours), respectively.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)
EP91302749A 1990-03-31 1991-03-28 Hydraulische Flüssigkeiten für Kraftfahrzeugaufhängungen Expired - Lifetime EP0453114B1 (de)

Applications Claiming Priority (4)

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JP8292790 1990-03-31
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JP78683/91 1991-02-18

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EP0453114B1 EP0453114B1 (de) 1995-05-24

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0593068A1 (de) * 1992-10-15 1994-04-20 Nippon Oil Company, Limited Hydraulische Ölzusammensetzung für Dämpfer
EP0721978A2 (de) * 1995-01-12 1996-07-17 Ethyl Corporation Synthetische Kraftübertragungsflüssigkeiten mit verbesserter Leistung
WO1996027648A1 (en) * 1995-03-03 1996-09-12 Exxon Research & Engineering Company Power steering fluid with wide performance range
EP0761805A2 (de) * 1995-09-12 1997-03-12 The Lubrizol Corporation Schmierflüssigkeiten zur Verminderung des Lufteintrags und zum verbesserten Zahnradschutz
EP0799883A1 (de) * 1995-10-19 1997-10-08 Idemitsu Kosan Company Limited Hydraulische ölzusammensetzung
WO1998039400A2 (en) * 1997-03-07 1998-09-11 Exxon Chemical Patents Inc. Lubricating compostion
SG100670A1 (en) * 2000-04-18 2003-12-26 Chevron Oronite Japan Ltd Lubricating oil composition having excellent thermal stability, extreme pressure resistance and anti-wear performance
WO2009006180A1 (en) * 2007-06-28 2009-01-08 Chevron U.S.A. Inc. Power steering fluid
CN107532099A (zh) * 2015-04-28 2018-01-02 Kyb株式会社 油压减震器用工作油和油压减震器
EP2118246B1 (de) * 2007-02-28 2018-10-24 Croda International PLC Methode und Verwendung eines MOTORSCHMIERMITTEL für Viertaktmotoren

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JP3259999B2 (ja) * 1993-01-25 2002-02-25 東燃ゼネラル石油株式会社 緩衝器用潤滑油
JP4963531B2 (ja) * 2001-03-19 2012-06-27 Jx日鉱日石エネルギー株式会社 摺動面用潤滑油組成物
US7470381B2 (en) * 2003-07-25 2008-12-30 Rohmax Additives Gmbh Functional fluid and the use thereof
JP4987251B2 (ja) * 2005-06-03 2012-07-25 Jx日鉱日石エネルギー株式会社 緩衝器用油圧作動油組成物
WO2006129889A1 (ja) * 2005-06-03 2006-12-07 Nippon Oil Corporation 緩衝器用油圧作動油組成物
JP4689583B2 (ja) * 2006-11-24 2011-05-25 出光興産株式会社 油圧作動油組成物
JP5087262B2 (ja) * 2006-11-27 2012-12-05 出光興産株式会社 自動車緩衝器用潤滑油組成物
JP5345760B2 (ja) * 2007-03-30 2013-11-20 Jx日鉱日石エネルギー株式会社 緩衝器用油圧作動油組成物及び緩衝器における減衰力向上方法
JP5395474B2 (ja) * 2009-03-13 2014-01-22 コスモ石油ルブリカンツ株式会社 工業用作動油組成物
JP5295892B2 (ja) * 2009-07-16 2013-09-18 コスモ石油ルブリカンツ株式会社 緩衝器用油圧作動油組成物
JP6159107B2 (ja) * 2013-03-15 2017-07-05 出光興産株式会社 潤滑油組成物
EP3650702B1 (de) * 2018-11-12 2020-09-16 Pfeiffer Vacuum Gmbh Verwendung eines synthetischen öls in einer vakuumpumpe und vakuumpumpe

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Cited By (17)

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EP0593068A1 (de) * 1992-10-15 1994-04-20 Nippon Oil Company, Limited Hydraulische Ölzusammensetzung für Dämpfer
EP0721978A2 (de) * 1995-01-12 1996-07-17 Ethyl Corporation Synthetische Kraftübertragungsflüssigkeiten mit verbesserter Leistung
EP0721978A3 (de) * 1995-01-12 1997-06-11 Ethyl Corp Synthetische Kraftübertragungsflüssigkeiten mit verbesserter Leistung
WO1996027648A1 (en) * 1995-03-03 1996-09-12 Exxon Research & Engineering Company Power steering fluid with wide performance range
EP0761805A2 (de) * 1995-09-12 1997-03-12 The Lubrizol Corporation Schmierflüssigkeiten zur Verminderung des Lufteintrags und zum verbesserten Zahnradschutz
EP0761805A3 (de) * 1995-09-12 1997-06-11 Lubrizol Corp Schmierflüssigkeiten zur Verminderung des Lufteintrags und zum verbesserten Zahnradschutz
US5902777A (en) * 1995-10-19 1999-05-11 Idemitsu Kosan Co., Ltd. Hydraulic working oil composition
EP0799883A1 (de) * 1995-10-19 1997-10-08 Idemitsu Kosan Company Limited Hydraulische ölzusammensetzung
EP0799883A4 (de) * 1995-10-19 1998-04-29 Idemitsu Kosan Co Hydraulische ölzusammensetzung
WO1998039400A2 (en) * 1997-03-07 1998-09-11 Exxon Chemical Patents Inc. Lubricating compostion
WO1998039400A3 (en) * 1997-03-07 1998-12-03 Exxon Chemical Patents Inc Lubricating compostion
AU733775B2 (en) * 1997-03-07 2001-05-24 Exxon Chemical Patents Inc. Lubricating composition
US6613722B1 (en) 1997-03-07 2003-09-02 Exxon Chemical Patents Inc. Lubricating composition
SG100670A1 (en) * 2000-04-18 2003-12-26 Chevron Oronite Japan Ltd Lubricating oil composition having excellent thermal stability, extreme pressure resistance and anti-wear performance
EP2118246B1 (de) * 2007-02-28 2018-10-24 Croda International PLC Methode und Verwendung eines MOTORSCHMIERMITTEL für Viertaktmotoren
WO2009006180A1 (en) * 2007-06-28 2009-01-08 Chevron U.S.A. Inc. Power steering fluid
CN107532099A (zh) * 2015-04-28 2018-01-02 Kyb株式会社 油压减震器用工作油和油压减震器

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EP0453114B1 (de) 1995-05-24

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