EP0328641B1 - Fluide de traction - Google Patents

Fluide de traction Download PDF

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Publication number
EP0328641B1
EP0328641B1 EP87904956A EP87904956A EP0328641B1 EP 0328641 B1 EP0328641 B1 EP 0328641B1 EP 87904956 A EP87904956 A EP 87904956A EP 87904956 A EP87904956 A EP 87904956A EP 0328641 B1 EP0328641 B1 EP 0328641B1
Authority
EP
European Patent Office
Prior art keywords
traction
fluid
traction fluid
diester
acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP87904956A
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German (de)
English (en)
Other versions
EP0328641A1 (fr
EP0328641A4 (fr
Inventor
Narihiko Yoshimura
Hirotaka Tomizawa
Yasuji Komatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tonen General Sekiyu KK
Original Assignee
Tonen Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Tonen Corp filed Critical Tonen Corp
Priority to DE19873788135 priority Critical patent/DE3788135T2/de
Publication of EP0328641A4 publication Critical patent/EP0328641A4/fr
Publication of EP0328641A1 publication Critical patent/EP0328641A1/fr
Application granted granted Critical
Publication of EP0328641B1 publication Critical patent/EP0328641B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/36—Esters of polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/34—Esters of monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/002—Traction fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/042—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for automatic transmissions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/044—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for manual transmissions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/046—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/06—Instruments or other precision apparatus, e.g. damping fluids

Definitions

  • This invention relates to a traction fluid. More particularly, the present invention is concerned with a traction fluid comprising by incorporating a diester or its derivative having two cyclohexyl rings as a base oil.
  • Traction drive power transmissions which transmit power to a driven part through a traction drive mechanism, have attracted attention in the field of automobiles and industrial machinery, and in recent years research and development thereon has progressed.
  • the traction drive mechanism is a power transmitting mechanism using a rolling friction. Unlike conventional drive mechanisms it does not use any gears, which enables a reduction in vibration and noise as well as a smooth speed change in highspeed rotation.
  • An important goal in the automobile industry is improvement in the fuel economy of automobiles. It has been suggested that if the traction drive is applied to the transmission of automobiles to convert the transmission to a continuous variable-speed transmission the fuel consumption can be reduced by 20% or more compared to conventional transmission systems since the drive can always be in the optimum speed ratio.
  • traction coefficient is defined as the ratio of the tractional force which is caused by slipping at the contact points between rotators which are in contact with each other in a power transmission of the rolling friction type to the normal load.
  • the traction fluid is required to be a lubricating oil having a high traction coefficient. It has been confirmed that a traction fluid possessing a molecular structure having a naphthene ring exhibits a high performance. "Santotrack®” manufactured by the Monsanto Chemical Company is widely known as a commercially available traction fluid. Japanese Patent Publication No. 47-35763 discloses di(cyclohexyl)alkane and dicyclohexane as traction fluids having a naphthene ring.
  • the present inventors have made extensive and intensive studies with a view to developing a traction fluid which not only exhibits a high traction coefficient but is also inexpensive. As a result, the inventors have found that the incorporation of a diester or its derivative, in which two cyclohexyl rings are connected through a linear chain hydrocarbon, can economically provide an higher-performance base oil fluid.
  • the present invention is based on this finding.
  • the present invention relates to a traction fluid. characterized by incorporating a diester or its derivative, in which the diester is represented by the general formula: wherein A' is an ester linkage of -COO- or -OOC-, n is an integer of 1 to 4, each R1 is independently selected from a hydrogen atom and alkyl groups having 1 to 8 carbon atoms, and each R2 is independently selected from a hydrogen atom and alkyl groups having 1 to 3 carbon atoms.
  • a first object of the present invention is to provide a high-performance traction fluid having a high traction coefficient.
  • a second object of the present invention is to provide a tractian fluid which is not only economical but also readily available and easily applicable to transmissions.
  • the traction fluid of the present invention is a diester or its derivative having two cyclohexyl rings linked through a Straight or branched chain of hydrocarbon and is represented by the above-mentioned general formula.
  • A' of the ester linkage is -COO- or -OOC-, and the number, n, of the carbon atoms in the hydrocarbon skelton, is 1 to 4. When n is zero the traction coefficient is low.
  • This diester or derivative thereof can be prepared by the following methods, and has a viscosity of 5 to 50 cst (5x10 ⁇ 6 to 5x10 ⁇ 5 m2/s), preferably 7 to 30 cst (7x10 ⁇ 6 to 3x10 ⁇ 5 m2/s) at 40°C, and 1 to 10 cst (1x10 ⁇ 6 to 1x10 ⁇ 5 m2/s), preferably 2 to 6 cst (2x10 ⁇ 6 to 6x10 ⁇ 6 m2/s), at 100°C.
  • the diester derivative include an amino compound, a halide compound, and an ether compound.
  • the diester can be prepared by any of the following methods.
  • the first method comprises an esterification reaction of a dihydric alcohol with a cyclohexanecarboxylic acid compound.
  • the dihydric alcohol has 1 to 4 carbon atoms in the main chain.
  • examples of the dihydric alcohol include ethylene glycol, 1,3-propanediol, 1,3-butanediol and 1,4-butanediol.
  • cyclohexanecarboxylic acid compound examples include, besides cyclohexanecarboxylic acid, those having an alkyl group with 1 to 8 carbon atoms, e.g., methylcyclohexanecarhoxylic acid, ethtlcyclohexanecarboxylic acid, etc. Cyclohexacarboxylic acid is particularly preferred.
  • the esterification reaction is conducted with an alcohol/acid molar ratio of 1:2, or in the presence of an access amount of the acid.
  • the former method requires the use of a catalyst and further has the problem that a monoalcohol is produced as the by-product. Therefore, it is preferred that the esterification reaction be conducted in the presence of an excess amount of the acid.
  • reaction temperature is about 150 to 250°C. preferably 170 to 230°C, and the reaction time is 10 to 40 hr, preferably 15 to 25 hr.
  • the esterification reaction may be conducted under either elevated or reduced pressures, it is preferred that the reaction is conducted at atmospheric pressure from the standpoint of ease of reaction operation. Under this condition, the excess acid serves as a catalyst.
  • An alkylbenzene such as xylene or toluene can be added in a suitable amount as a solvent. The addition of the solvent enables the reaction temperature to be easily controlled.
  • the water formed during the reaction evaporates.
  • the reaction is terminated when the amount of the water reaches, on a mole basis, twice that of the alcohol.
  • the excess acid is neutralized with an aqueous alkaline solution and removed by washing with water.
  • the reaction is conducted using the acid in an amount of 2 to 2.5-fold mol excess over the alcohol in the presence of a catalyst.
  • the catalyst include phosphoric acid, p-toluenesulfonic acid and sulfuric acid.
  • the most preferable catalyst is phosphoric acid because it enhances the reaction rate and increases the yield of the ester.
  • the reaction product is finally distilled under reduced pressure to remove water and the solvent, thereby obtaining the diester compound of the present invention.
  • the second method of producing the diester comprises esterification of cyclohexanol compound with a dicarboxylic acid having 3 to 6 carbon atoms in the main chain.
  • the cyclohexanol compound include, besides cyclohexanol, those having an alkyl group with 1 to 8 carbon atoms, e.g., methylcyclohexanol and tert-butylcyclohexanol. Cyclohexanol is particularly preferred.
  • the dicarboxylic acid examples include malonic acid, succinic acid and glutaric acid.
  • the esterification reaction is conducted in an alcohol/acid molar ratio of 2:1 or in the presence of an excess amount of the alcohol. In the former method, there is a possibility of forming a monocarboxylic acid as the by-product. Therefore, it is preferred that the esterification reaction is conducted in the presence of an excess amount of the alcohol. Specifically, 1 mol of the dicarboxylic acid is reacted with the alcohol in 2.5 to 5-fold by mol excess.
  • the reaction temperature is about 150 to 250°C, preferably 170 to 230°C, and the reaction time is 10 to 40 hr, preferably 15 to 25 hr.
  • the esterification reaction may be conducted under either elevated or reduced pressures, it is preferred that the reaction be conducted at atmospheric pressure from the standpoint of ease of reaction operation.
  • An alkylbenzene such as xylene or toluene can be added in a suitable amount as a solvent. The addition of the solvent enables the reaction temperature to be easily controlled.
  • Phosphoric acid, p-toluenesulfonic acid or sulfuric acid can be used as a catalyst.
  • the most preferable catalyst is phosphoric acid because it enhances the reaction rate and increases the yield of the ester.
  • the reaction product is finally distilled under reduced pressure to remove the water, solvent and excess alcohol, thereby obtaining the diester compound of the present invention.
  • the diester of the present invention e.g., a diester of succinic acid with cyclohexanol, exhibits a traction coefficient of 0.102 to 0.106. Therefore, the use of the diester alone in the traction drive device results in a high performance.
  • a second component may be optionally incorporated into the diester. Specifically, the second component is so selected that it cooperates with the cyclohexyl rings of the diester to exhibit a synergistic effect with respect to improving traction coefficient and is so selected that it is inexpensive and exhibits excellent viscosity characteristics.
  • a traction fluid can be more economically obtained by blending the second component with the diester. Normally 0.01 to 90% by weight, particularly 0.1 to 70% by weight, of the second component, is blended.
  • additives may also be added to the traction fluid of the present invention depending upon their applications. Specifically, when the traction device undergoes a high temperature and a large load, at least one additive selected from among an antioxidant, a wear inhibitor and a corrosion inhibitor may be added in an amount of 0.01 to 5% by weight. Similarly, when a high viscosity index is required, a known viscosity index improver is added in an amount of 1 to 10% by weight.
  • traction fluid as used in the present invention is intended to mean a fluid for use in devices which transmit a rotational torque through point contact or line contact, or for use in transmissions having a similar structure.
  • the traction fluid of the present invention exhibits a traction coefficient higher than those of conventionally known fluids, i.e., exhibits a traction coefficient 1 to 15% higher than those of the conventional fluids, although the value varies depending on the viscosity. Therefore, the traction fluid of the present invention can be advantageously used for relatively low power drive transmissions including internal combustion engines of small passenger cars, spinning machines and food producing machines, as well as large power drive transmissions such as industrial machines, etc.
  • the traction fluid of the present invention exhibits a remarkably superior traction coefficient relative to the conventional fluids.
  • the reason why the traction fluid of the present invention exhibits a high traction coefficient is not yet fully understood. However, basically, the reason is believed to reside in the unique molecular structure of the traction fluid of the present invention.
  • the traction fluid of the present invention comprises a diester having two cyclohexyl rings in its molecule.
  • the two ester linkages bring about an interdipolar force between the molecules. It is believed that the interdipolar force serves to bring the fluid into a stable glassy state under high load conditions, thereby increasing the shearing force.
  • the traction fluid of the present invention possesses a structure having suitable flexibility because the carbon atoms in the basic skeleton are connected to the two cyclohexyl rings through an ester linkage.
  • Dicyclohexyl diester compound A1 of the present invention was synthesized by the following method: First, 118g of succinic acid and 250g of cyclohexanol (i.e., 2.5 mol per mol of succinic acid) were charged into a reactor, and phosphoric acid was added in an amount of 1% by weight based on the total weight of the reactants. The reactor was heated at 180°C. The contents of the reactor were allowed to react at a temperature in the range of 180°C to 210°C under atmospheric pressure.
  • the reaction was stopped at a point when the water generated during the reaction amounted to twice, by mol, of the amount of the succinic acid.
  • the reaction mixture was washed with an alkaline solution to remove unreacted compounds, i.e., cyclohexanol, and phosphoric acid, from the mixture of the reaction product, i.e., an ester of cyclohexanol with succinic acid, the unreacted compounds, and phosphoric acid, followed by vacuum distillation, thereby isolating a pure diester (A1).
  • diesters (A2 to A4) of the present invention were synthesized using the following raw materials:
  • the traction fluid of the present invention was found to be remarkably superior in traction performance to the conventional fluids as shown in Table 1.
  • a commercially available traction fluid B (Santotrack®, manufactured by the Monsanto Chemical Company), polybutene C (having an average molecular weight of 900), a commercially available naphthenic fluid D (having 1 to 3 cyclohexyl rings), and dicyclohexyl fumarate diester E were used as comparative samples.
  • the traction coefficient of each comparative sample was measured in the same manner as described in the above examples.
  • the traction fluid of the present invention comprises by incorporating a diester of which the skeleton comprises two cyclohexyl rings and linear chain hydrocarbons and not only exhibits an extremely high traction coefficient but also is inexpensive and exhibits excellent viscosity characteristics.
  • the use of the traction fluid of the present invention in a power transmission device, particularly a traction drive device leads to a remarkable increase in shearing force under a high load, which enables the reduction in size of the device and economical supply of the device.

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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)

Abstract

Fluide de traction préparé par formation d'un composé diester représenté par la formule générale (I), où A' représente une liaison ester de -COO- ou -OOC-, n est compris entre 1 et 10, les groupes R1 représentent un ou deux membres sélectionnés parmi un atome d'hydrogène et un groupe alkyle possédant de 1 à 8 atomes de carbone, et les groupes représentent un ou deux membres sélectionnés parmi un atome d'hydrogène et un groupe alkyle possédant de 1 à 3 atomes de carbone. Des dérivés de ce composé sont également décrits. Ce fluide est utilisé de préférence dans une unité de transmission de puissance, notamment dans une unité d'entraînement par traction.

Claims (7)

  1. Fluide de traction comprenant un diester représenté par la formule
    Figure imgb0005
     dans laquelle chacun des groupes A' qui peuvent être identiques ou différents, représente une liaison ester de formule -COO- ou -OOC- ; n est un nombre entier de 1 à 4 ; chacun des groupes R₁, qui peuvent être identiques ou différents, est choisi indépendamment entre l'hydrogène et des groupes alkyle ayant l à 8 atomes de carbone ; et chacun des groupes R₂, qui peuvent être identiques ou différents, est choisi indépendamment entre l'hydrogène et des groupes alkyle ayant 1 à 3 atomes de carbone ; ou un de ses dérivés.
  2. Fluide de traction suivant la revendication 1, dans lequel chacun des groupes R₁ du diester est choisi indépendamment entre l'hydrogène et des groupes alkyle ayant 1 à 4 atomes de carbone.
  3. Fluide de traction suivant l'une des revendications 1 et 2, dans lequel chacun des groupes R₂ du diester est choisi entre l'hydrogène et un groupe méthyle.
  4. Fluide de traction suivant l'une quelconque des revendications 1 à 3, dans lequel le dérivé est un composé à fonction amino, halogéno ou éther.
  5. Fluide de traction suivant l'une quelconque des revendications 1 à 4, comprenant en outre au moins un additif choisi dans le groupe consistant en un antioxydant, un agent anti-usure et un inhibiteur de corrosion, en une quantité de 0,01 à 5 % en poids.
  6. Fluide de traction suivant l'une quelconque des revendications 1 à 5, comprenant en outre un agent améliorant l'indice de viscosité, en une quantité de 1 à 10 % en poids.
  7. Utilisation d'un diester suivant la revendication 1 comme huile de base pour un fluide de traction.
EP87904956A 1987-07-29 1987-07-29 Fluide de traction Revoked EP0328641B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873788135 DE3788135T2 (de) 1987-07-29 1987-07-29 Antriebsflüssigkeit.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1987/000561 WO1989001020A1 (fr) 1987-07-29 1987-07-29 Fluide de traction

Publications (3)

Publication Number Publication Date
EP0328641A4 EP0328641A4 (fr) 1989-07-25
EP0328641A1 EP0328641A1 (fr) 1989-08-23
EP0328641B1 true EP0328641B1 (fr) 1993-11-10

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Family Applications (1)

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EP87904956A Revoked EP0328641B1 (fr) 1987-07-29 1987-07-29 Fluide de traction

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WO (1) WO1989001020A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0949319A3 (fr) * 1998-04-08 2001-03-21 Nippon Mitsubishi Oil Corporation Fluide de traction
US11414615B2 (en) 2018-10-19 2022-08-16 New Japan Chemical Co., Ltd. Power transmission lubricant oil base oil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440894A (en) * 1966-10-13 1969-04-29 Monsanto Co Tractants and method of use
JPS53127970A (en) * 1977-04-14 1978-11-08 Nippon Oil & Fats Co Ltd Synthetic lubricating oil compound
JPS59191797A (ja) * 1983-04-14 1984-10-30 Nippon Petrochem Co Ltd トラクシヨンドライブ用流体
JPH0631366B2 (ja) * 1986-01-31 1994-04-27 東燃株式会社 トラクシヨンフル−ド
JP2714332B2 (ja) * 1992-10-07 1998-02-16 株式会社東芝 データ記録再生装置およびディスク固定方法

Also Published As

Publication number Publication date
EP0328641A1 (fr) 1989-08-23
EP0328641A4 (fr) 1989-07-25
WO1989001020A1 (fr) 1989-02-09

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