JPH01198692A - Fluid for traction drive - Google Patents

Abstract

PURPOSE:To obtain the title fluid having flow viscosity and excellent traction properties in a wide range from low to high temperatures, containing hydrogenated oligomers (>=tri-) of cyclic monoterpenoids. CONSTITUTION:Usually 0.1-90wt.% (preferably 2-60wt.%) hydrogenated tri- or polymers of preferably cyclic monoterpenoids consisting of menthadienes, pinenes or bicyclo [2,2,1] heptanes is used to afford the aimed fluid. The said hydrogenated oligomer is usually one of the trimer-decamer or mixture thereof.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a traction drive fluid, and more particularly to a traction drive fluid that has low viscosity and exhibits excellent traction performance over a wide temperature range from low to high temperatures. .

[Prior art and problems to be solved by the invention] In general, traction drive fluids are used in traction drive devices (friction drive devices using rolling contact), such as continuously variable transmissions for automobiles, continuously variable transmissions for industrial use, and water pressure. It is a fluid used in equipment, etc., and is required to have a high traction coefficient, stability against heat and oxidation, and economic efficiency.

In recent years, research has been focused on reducing the size and weight of traction drive devices, mainly for automotive applications, and as a result, the traction drive fluid used in these traction drive devices has also been developed to withstand use under a variety of harsh conditions. Performance, especially from low to high temperatures (about -30 to 140'C)
It is required to be able to stably exhibit high performance (high traction coefficient, low viscosity, excellent thermal and oxidative stability, etc.) over a wide temperature range up to

However, although various traction drive fluids have been developed so far, including Japanese Patent Publication No. 46-338 and Japanese Patent Publication No. 46-339, none of them satisfy the above-mentioned required characteristics. There were various problems. For example, a compound that exhibits a high traction coefficient at high temperatures has a high viscosity and a large stirring loss, resulting in low transmission efficiency and also has problems in low-temperature startability. On the other hand, compounds with low viscosity and excellent transmission efficiency have a low traction coefficient at high temperatures, and their viscosity decreases too much at high temperatures, causing problems with the lubrication of traction transmission devices.

[Means for solving problems]

Therefore, the inventors of the present invention have conducted extensive research in order to solve the problems of the above-mentioned conventional technology and to develop a traction drive fluid that has low viscosity and excellent performance over a wide temperature range from low to high temperatures.

As a result, it has been found that a traction drive fluid having the desired traction performance can be obtained by blending a trimeric or higher polymer hydrogenated product of cyclic monoterpenoids with other traction oil. The present invention was completed based on this knowledge.

That is, the present invention provides a traction drive fluid characterized by containing a hydrogenated trimeric or higher polymer of cyclic monoterpenoids.

There are various types of cyclic monoterpenoids mentioned above,
Suitable examples include menthagenes, pinenes and bicyclo(2,2,1)hebutanes.

Here, menthagenes have a basic skeleton in which a methyl group and an isopropyl group are substituted at positions 1.2, 1, 3, or 1.4 of a cyclohexane ring, respectively, and carbon-
Those having two carbon double bonds, specifically, limonene; isolimonene; α-1β-9γ-terpinene;
Examples include the d-form, 1-form, and d-form of α-2β-phelandrene; terpyrun; and silvestrene. Further, these compounds can be substituted with an alkyl group or a hydroxyl group, but it is preferable to use unsubstituted menthagenes. Also, mixtures of these can be used as well.

In addition, the pinenes include α-pinene (d-form, !-form, d-form), β-pinene
-pinene (d-form, 2-form), δ-pinene (d-form, β-form),
Examples include orthodene, and mixtures thereof may be used.Furthermore, these compounds substituted with an alkyl group or a hydroxyl group can be used, but it is preferable to use unsubstituted pinenes.

The above bicyclo(2,2,1)hebutanes include camphene (d-form, !-form, d1-form) and bornylene (d-form).

1 body), α-Fengchen (d body, ! body, d body).

β-Fengchen (d-body, 6-body), γ-Fengchen,
δ-fenchen, ε-fenchen, ζ-fenthiene, borneol (d-form, ffi-form, 6-form), π-borneol (d-form, 2-form), ω-borneol, isoborneol (d-form, !-form, a form), camphuene hydrate, α
-Fentyl alcohol (d-form, β-form, 6-form), β-fentyl alcohol (d-form, !-form, d-form), α-isofentyl alcohol (d-form, !-form, d-form), β- Examples include isophentyl alcohol (d-form, d-form, d-form), and mixtures thereof may also be used.

Furthermore, compounds obtained by introducing various substituents into these compounds can also be used.

Polymerization of the above-mentioned cyclic monoterpenoids to form a trimer or higher polymer is carried out in the presence of a catalyst, using a solvent if necessary. Although various catalysts can be used for the polymerization of cyclic monoterpenoids, acidic catalysts are generally used. Specifically, white earths such as activated clay and acid clay, mineral acids such as sulfuric acid, hydrochloric acid, and hydrofluoric acid, organic acids such as P-)luenesulfonic acid and triflic acid, aluminum chloride, ferric chloride, Lewis acids such as stannic chloride, boron trifluoride, boron tribromide, aluminum bromide, gallium chloride, gallium bromide, and solid acids such as zeolites and silica.

Alumina, silica/alumina, cation exchange resin.

Various types of heteropolyacids can be used, and they may be selected appropriately in consideration of ease of handling, economical efficiency, and the like. The amount used is not particularly limited, but is usually in the range of 0.1 to 100% by weight, preferably 0.5 to 20% by weight, based on the cyclic monoterpenoids.

In polymerizing cyclic monoterpenoids into a trimer or higher form, a solvent is not necessarily required, but it is preferably used for handling the cyclic monoterpenoids and catalyst during the reaction or for controlling the progress of the reaction. As such a solvent, most saturated hydrocarbons such as n-pentane, n-hexane, heptane, octane, nonane, decane, etc., cyclopenkune, cyclohexane, methylcyclohexane, decalin, etc. can be used. In the case of catalysts with weak reaction promoting properties such as the above, aromatic hydrocarbons such as benzene, toluene, xylene, tetralin, etc. can also be used.

The polymerization reaction is carried out in the presence of these catalysts, and the reaction conditions are generally set within a temperature range of -30 DEG C. to 180 DEG C., depending on the type of catalyst, additives, etc. For example, when the catalyst is white earth or zeolite, the reaction temperature is from room temperature to 180°C, preferably 60"C or higher, and when other catalysts are used, the reaction temperature is -30°C to 100'C, preferably 0°C. The above polymerization is carried out at a temperature of C to 60° C. The above polymerization can be carried out not only by homopolymerization using one type of cyclic monoterpenoid as a raw material, but also by copolymerization using two types of cyclic monoterpenoids as raw materials.

Next, the trimer or higher polymer (including copolymer) of cyclic monoterpenoids thus obtained is hydrogenated to obtain the desired hydrogenated polymer. Hydrogenation is
This may be carried out on the entire amount of the above-mentioned trimer or higher polymer, or may be carried out by fractionating or fractionating a part thereof.

This hydrogenation is also carried out in the presence of a catalyst like the polymerization described above, but the catalyst is one type of metal such as nickel, ruthenium, palladium, platinum, rhodium, iridium, copper, chromium, molybdenum, cobalt tungsten, etc. Those known as so-called hydrogenation catalysts including those mentioned above can be used. The amount of this catalyst added is 0.1 to 100% by weight, preferably 1 to 10% by weight based on the above polymer.
is within the range of

Further, like the polymerization reaction described above, this hydrogenation proceeds even without a solvent, but a solvent can also be used. In this case, the type of solvent is -n-pentane.

n-hexane, heptane, octane, nonane, decane,
Most liquid saturated hydrocarbons such as dodecane, cyclopenkune, cyclohexane, and methylcyclohexane can be used. Further, liquids such as aromatics, olefins, alcohols, ketones, ethers, etc. can be used, but saturated hydrocarbons are particularly preferred.

The reaction temperature is usually room temperature to 300°C, preferably 40 to 300°C.
200'C, reaction pressure is 200kg from normal pressure
/c1iIG, preferably 100kg/dlG from normal pressure
It can be carried out within the range of - - It can be carried out in the same manner as in the case of hydrogenation.

The viscosity of the trimeric or higher polymer hydrogenated product of cyclic monoterpenoids produced in this way varies depending on the degree of polymerization, but since it generally has a high viscosity, it is better to use it as is for other purposes. It is preferable to blend it into a traction oil to improve its traction coefficient.

In this case, the amount of the polymer hydrogenated product is not particularly limited and may be selected appropriately depending on the type of the polymer hydrogenated product and the type of other traction oil to be blended. It is determined in the range of 0.1 to 90% by weight, preferably 2 to 60% by weight of the entire fluid.

The degree of polymerization of the above-mentioned hydrogenated polymer is not particularly limited as long as it is at least the trimer of the cyclic monoterpenoids, but it is usually a trimer to a decamer or a mixture thereof. It is.

In addition, other traction oils that should be blended with the trimeric or higher polymer hydrogenated product of the above-mentioned cyclic monoterpenoids include those conventionally used as traction drive oils, as well as those that have poor traction performance when used alone. There are various things that can be mentioned, such as oils that are not in practical use. For example, a wide range of liquid materials can be used, such as mineral oils such as paraffinic mineral oils, naphthenic mineral oils, and intermediate mineral oils, alkylbenzenes, polybutenes, polyα-olefins, synthetic naphthenes, esters, and ethers. Among the,
Preferred are alkylbenzenes, polybutenes, and synthetic naphthenes. Here, the synthetic naphthenes include alkane derivatives having two or more cyclohexane rings, alkane derivatives having one or more decalin rings and one or more cyclohexane rings, alkane derivatives having two or more decalin rings, cyclohexane rings or decalin rings. There are compounds that have a structure in which two or more are directly bonded. A specific example of such a synthetic naphthene is 1-cyclohexyl-
1-decarylethane; 1,3-dicyclohexyl-3-
Methylbutane; 2,4-dicyclohexylpentane; 1
．． 2-bis(methylcyclohexyl)-2-methylpropane; 1,1-bis(methylcyclohexyl)-2-methylpropane: 2,4-dicyclohexyl-2-methylpentane; hydrogenated limonene dimer; amount of vinylene Body hydrogenated product: camphene dimer hydrogenated product can be mentioned.

The traction drive fluid of the present invention contains a trimeric or higher polymer hydrogenated product of cyclic monoterpenoids as an essential component, and is prepared by further blending another liquid (traction oil). Antioxidants, if necessary
Rust preventive agent, cleaning dispersant.

Appropriate amounts of various additives such as pour point depressants, viscosity index improvers, extreme pressure agents, anti-wear additives, anti-fatigue agents, antifoaming agents, oiliness improvers and coloring agents can also be used.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Comparative Example 1 1000 g of α-methylstyrene, 50 g of acid clay, and 50 g of ethylene glycol were placed in a 22-meter fourth flask equipped with a stirrer, a thermometer, two dropping funnels, and a Dimroth reflux condenser, and heated to 140°C without stirring. The mixture was allowed to react for 2 hours. After filtering the catalyst from the reaction solution, unreacted α-methylstyrene and ethylene glycol were distilled off to reduce the boiling point to 1.
25-130”C/ 0.2 mmHg fraction 900g
I got it. As a result of nuclear magnetic resonance (NMR) analysis and gas chromatography analysis, this fraction was confirmed to be a mixture of 95% linear dimer and 5% cyclic dimer of α-methylstyrene.

This fraction 500- and a nickel catalyst for hydrogenation (JGC Chemical ■
Product: NN-113) Lo into 11 autoclave,
Hydrogenation was carried out at a hydrogen pressure of 50 kg/cJG and a reaction temperature of 200°C for 3 hours to produce 2,4-dicyclohexyl-2.
- A traction drive fluid containing methylpentane as a main component was obtained.

The properties of this product were as follows.

Kinematic viscosity 20.27cSt (40'C) 3.58
0 cSt (100°C) Viscosity Index 13 Pour Point -35°C or lower Further, the traction coefficient of this product was measured in the temperature range from 6°C to 140°C, and the results are shown in FIG.

Example 1 The fluid obtained in Comparative Example 1 was added to a commercially available hydrogenated terpene resin (number average molecular weight: 63o), which is a hydrogenated product of a trimer or higher polymer made from pinene and limonene.

Manufactured by Yasuyu Kogyo ■, product name: Clearon P-85) 1
A fluid having the following properties was obtained by mixing 5% by weight.

Kinematic viscosity 47.96cSt (40'C) 5.55
4cSt (100°C) Viscosity Index 13 Specific Gravity (15/4°C) 0.9153 Refractive Index (no) 1.4973 The traction coefficient of this fluid was set at 140°C from 6o''C.
The results are shown in Figure 1.

Comparative Example 2 552 g of toluene, 27.6 g of anhydrous aluminum chloride, and 12.6 g of nitromethane were placed in a No. 21 four-bottle flask, and 181 g of methallyl chloride was added while stirring at o'c.
．． 2 g was added dropwise over 2 hours, and stirring was continued for an additional 1 hour to complete the reaction. After adding 75 mA of water to decompose the aluminum chloride and separating the oil layer, the oil layer was washed once with 200 mA of water and twice with 300 mA of 1 N aqueous sodium hydroxide solution, and dried over anhydrous magnesium sulfate. Ta.

Next, unreacted raw materials are distilled off using a rotary evaporator, and then distilled under reduced pressure to achieve a boiling point of 114-116°C10.
, 254 g of a fraction of 14 mmHg was obtained.

As a result of analysis, this fraction contained 80% 2-methyl-1,2-ditolylpropane and 2-methyl-1,2-ditolylpropane, an isomerization product.
1-ditolylpropane was found to be 20%.

Next, 250 g of this fraction was placed in 11 autoclaves and nickel catalyst (made by JGC Chemical ■: NN-113) was added.
5 at a hydrogen pressure of 70 kg/c4G and a temperature of 180°C.
Hydrogenation was carried out over time. When the catalyst was removed from the resulting reaction product and analyzed, the hydrogenation rate was 99.9% or more, with 80% of 2-methyl-1,2-di(methylcyclohexyl)propane and 2-methyl-1,2-di(methylcyclohexyl)propane. 1,1-di(methylcyclohexyl)propane was found to be 20%.

The properties of this product were as follows.

Kinematic viscosity 13.17cSt (40℃) 2.622c
St (100°C) Viscosity index -30 Specific gravity 0.8824 Refractive index (nD) 1.4800 Pour point -35°C or lower Furthermore, the traction coefficient of this product was measured in the temperature range from 6°C to 140°C. , the results are shown in Figure 2.

Example 2 A stirrer, a thermometer, a dropping funnel, and a Dimroth reflux condenser were attached to a 21-sized four-roof flask, and 3001n1 of methylcyclohexane was charged as a solvent, and 10 g of activated clay (Galleon Earth NS, manufactured by Mizusawa Kagaku ■) was charged as a catalyst. . After heating and stirring in an oil bath to bring the temperature to 85°C, 1000 g of dipentene (Limonene, Inc.) was added dropwise over 1 hour while stirring. 8 hours later, 85°
The reaction was carried out with continuous stirring at C. After cooling, the catalyst was filtered through a filter paper, and the solvent and unreacted raw materials were recovered using a rotary evaporator to obtain 650 g of the remaining reaction liquid.

650 g of this reaction solution and 10 nickel catalyst for hydrogenation (manufactured by JGC Chemical ■: NN-113) were added to 1 j! Place in an autoclave, hydrogen pressure 50 kg/cdG, reaction temperature 150''C.
Hydrogenation was carried out over time. After cooling, the catalyst was filtered and analyzed, and the hydrogenation rate was 99% or more.

This hydrogenated product was distilled under reduced pressure, and the boiling point was 110-122'C10.
, 2 mfflHg was distilled off to obtain about 250 g of a fraction consisting of 90% dipentene trimers, 8% tetramers, and 2% pentamers or more.

This product was mixed with the product obtained in Comparative Example 2 in an amount of 10% by weight to obtain a fluid having the following properties.

Kinematic viscosity 17.53cSt (40°C) 3.092
cSt (100°C) Viscosity index -35 Specific gravity 0.8887 Refractive index (no) 1.4833 Pour point -35°C or below Furthermore, the traction coefficient of this fluid is 1 from 60°C.
Measurements were made in a temperature range of 40'C, and the results are shown in FIG.

Example 3 A stirrer, a dropping funnel with a thermometer, and a Dimroth reflux condenser were attached to a 21-sized four-loaf flask, and 300 d of cyclohexane as a solvent and 10 g of activated clay (Galleon Earth NS, manufactured by Mizusawa Kagaku ■) as a catalyst were charged. 1000 g of β-pinene was added dropwise at room temperature over 4 hours while stirring. Thereafter, the reaction was allowed to continue for 30 minutes while stirring. Next, the catalyst was filtered through a filter paper, and the solvent and unreacted raw materials were recovered using a rotary evaporator to obtain 800 g of the remaining reaction liquid.

700 g of this reaction solution and a nickel catalyst for hydrogenation (manufactured by JGC Chemical ■: NN-113) Lo were placed in a No. 11 autoclave, and hydrogenation was carried out at a hydrogen pressure of 50 kg/dG and a reaction temperature of 100° C. for 3 hours. After cooling, the catalyst was filtered and analyzed, and the hydrogenation rate was 99% or more.

This hydrogenated product was distilled under reduced pressure, with a boiling point of 108 to 120'C/
200 g of a 0.2 m+nHg fraction was distilled off to obtain 600 g of a fraction consisting of 70% β-pinene trimer, 24% tetramer, and 6% tamer or more.

This product was mixed with the product obtained in Comparative Example 2 in an amount of 10% by weight to obtain a fluid having the following properties.

Kinematic viscosity 18.46cSt (40°C) 3, 188
cSt (100°C) Viscosity index -35 Specific gravity 0.8898 Refractive index (no) 1.4841 Pour point -35°C or below Furthermore, the traction coefficient of this fluid is changed from 60°C to 14
Measurements were made in a temperature range of 0°C, and the results are shown in FIG.

Example 4 A stirrer, a dropping funnel with two temperature needles, and a Dimroth reflux condenser were attached to a 21-piece four-roof flask, and 300 d of methylcyclohexane was charged as a solvent, and 50 g of activated clay (manufactured by Mizusawa Kagaku ■: Galleon Earth NS) was charged as a catalyst. .

After heating and stirring in an oil bath to 90°C, add gum turpentine (92% α-pinene, 5% β-pinene).
, other 3%) 500g and dipentene (d-limonene)
A mixture of 500 g and 500 g was added dropwise over a period of 2 hours while stirring. Thereafter, the reaction was allowed to proceed for 7 hours while stirring at 110°C. After cooling, the catalyst was filtered through a filter paper, and the solvent and unreacted raw materials were recovered using a rotary evaporator to obtain 600 g of the remaining reaction liquid.

600 g of this reaction solution and 10 nickel catalyst for hydrogenation (manufactured by JGC Chemical ■: NN-113) were placed in a IIl autoclave, hydrogen pressure was 50 kg/c + IIc, reaction temperature was 15
Hydrogenation was carried out at 0°C for 3 hours. After cooling, the catalyst was filtered and analyzed, and the hydrogenation rate was 99% or more.

This hydrogenated product was distilled under reduced pressure, and the boiling point was 105 to 125" C10.
, 15n+mHg fraction was distilled off to obtain 74% trimer, 22% tetramer, and 4 or more pentamer of pinene dipetene.
% fraction was obtained.

This product was mixed with the product obtained in Comparative Example 2 in an amount of 10% by weight to obtain a fluid having the following properties.

Kinematic viscosity 1 B, 11 cst (40°C) 3, 1
60 cSt (100°C) Viscosity index -33 Specific gravity 0.8890 Refractive index (no) 1.4827 Pour point -35°C or below Furthermore, the traction coefficient of this fluid is changed from 60°C to 14
Measurements were made in a temperature range of 0°C, and the results are shown in FIG.

Comparative Example 3 Ethylbenzene 270 in a glass flask with a content of 115 f
0 g, metallic sodium 58 g and potassium hydroxide 16
After heating to 120°C and stirring, a mixture of 1100 g of α-methylstyrene and 300 g of ethylbenzene was gradually added dropwise over 5 hours, and the mixture was stirred for 1 hour to carry out the reaction.

After the reaction was completed, the oil layer was separated and collected by cooling, 200 g of methyl alcohol was added thereto, and 2j2 of a 5N aqueous hydrochloric acid solution was added.
and saturated saline solution 21 three times. next,
After drying over anhydrous sodium sulfate, unreacted ethylbenzene was distilled off using an o-tally evaporator, and further distilled under reduced pressure to obtain a boiling point range of 106 to 10 at O.06 mmHH.
1350 g of a fraction at 8°C was obtained.

Next, 500 m of this fraction is reduced to an internal volume of 1! nickel catalyst for hydrogenation (manufactured by JGC Chemical: NN-).
113) 20 was added and hydrogenated at a reaction temperature of 200° C. and a hydrogen pressure of 50 kg/cIaG. After the reaction, the catalyst was removed, the light bones were stripped, and the results of analysis showed that the hydrogenation rate was 99.9% or more, and the hydrogenation product was 2,4-dicyclohexylpentane. was confirmed.

The properties of this product were as follows.

Kinematic viscosity 12.05 cst (40℃) 2.750
cSt (100°C) Viscosity index 47 Specific gravity 0.8913 Refractive index (nD) 1.4832 Pour point -35°C or lower Furthermore, the traction coefficient of this product was measured in the temperature range from 60°C to 140°C, and its The results are shown in Figure 3.

Example 5 300d of methylcyclohexane as a solvent and 20g of anhydrous aluminum chloride as a medium were charged into a 21 four-necked flask equipped with a stirrer, a thermometer, two dropping funnels, and a Dimroth reflux condenser.

Next, a mixed solution of 300 g of camphene and 50 d of methylcyclohexane was added dropwise over 1 hour while stirring at room temperature.

Thereafter, the reaction mixture was heated in an oil bath and stirred at 75°C for 1 hour. After cooling, the reaction solution was poured little by little into ice water 11 to complete the reaction. The organic layer is 15% hydrochloric acid 2
00id twice, 10% sodium bicarbonate aqueous solution 20
It was washed three times with 200 d of water and twice with 200 d of water, and dried with anhydrous magnesium sulfate.

After standing overnight, the drying agent, anhydrous magnesium sulfate, was filtered off, and the solvent and unreacted raw materials were recovered using a rotary evaporator to obtain 260 g of the remaining reaction liquid.

Analysis of this solution by hydrogen flame (FID) type gas chromatography (CC) revealed that camphuene dimer 2
The proportions were 8%, trimer 31%, daimer 28%, and pentamer 13%.

250g of this solution and a nickel catalyst for hydrogenation (JGC Chemical ■
NN-113) 25 was placed in a 12 autoclave, 200 d of methylcyclohexane was added as a solvent, and hydrogenated at a reaction temperature of 180° C. and a hydrogen pressure of 90 kg/dG for 5 hours. After cooling, the catalyst was removed and analysis revealed that the hydrogenation rate was 99% or more. This hydrogenated product was distilled under reduced pressure and the boiling point range was 122-136°C, 10.2mmHg.
The fraction was distilled off to obtain 160 g of a fraction consisting of trimers to pentamers of camphene.

This product was mixed with the product obtained in Comparative Example 3 in an amount of 10% by weight to obtain a fluid having the following properties.

Kinematic viscosity 17.47 cSt (40°C) 3.3 B
2 cSt (100°C) Viscosity index 36 Specific gravity 0.9005 Refractive index (nXl) 1.4871 Pour point -35°C or lower Furthermore, the traction coefficient of this fluid is 14 from 60°C.
Measurements were made in a temperature range of 0°C, and the results are shown in FIG.

The traction coefficients in Examples and Comparative Examples were measured using a two-cylinder friction tester. That is,
Contacting cylinders of the same size (diameter 52 mm, thickness 6 mm)
In a, the driven side is a tyco type with a radius of curvature of 10 am, and the W driving side is a flat type without crowning) at a constant speed (1
500 rpm) and the other from 1500 rpm+ to 175
Orpm, a 7 kg load was applied to the contact portion of both cylinders by a spring, and the tangential force generated between the two cylinders, that is, the trough silane force, was measured to determine the traction coefficient.

This cylinder is made of bearing steel 5UJ-2 with a mirror finish.
The maximum Hertzian contact pressure was 112 kgf/ml lb''.

As is clear from FIGS. 1 to 3, the traction drive fluid of the present invention can maintain a high traction coefficient, particularly in a high temperature range, and is suitable as a traction drive fluid.

〔Effect of the invention〕

The traction drive fluid of the present invention containing a trimeric or higher polymer hydrogenated product of cyclic monoterpenoids has a high traction coefficient over a wide temperature range from room temperature to high temperature, and improves transmission efficiency. the result,
It is possible to reduce the size and weight of the traction drive device, extend its life, and increase its output, and it can be widely used in various mechanical products such as continuously variable transmissions for automobiles or industrial use, and even hydraulic equipment.

In addition, the hydrogenated trimeric or higher polymers of the above-mentioned cyclic monoterpenoids can increase the traction coefficient simply by blending a small amount with other fluids, providing various excellent traction drive fluids. Is possible.

[Brief explanation of the drawing]

1 to 3 are graphs showing temperature changes in traction coefficients of traction drive fluids obtained in Examples and Comparative Examples. 60 80 Too 120
140 Oil temperature (°C) Figure 2 Oil temperature (°C) Figure 3 Oil temperature (°C) Procedural amendment (voluntary) Re: March 1, 1989 Yuji, Commissioner of the Patent Office Yoshi 1) Bunki 1
1. Incident display %
Special application number 1986-322479
2. Name of the invention: Fluid for traction drive 3. Relationship with the person making the amendment: Patent applicant: Idemitsu Kosan Co., Ltd. 4, Agent address: 105 3-25-35 Toranomon, Minato-ku, Tokyo.
Column 6 of the detailed explanation of the invention in the specification subject to amendment, "was" in lines 4-5 on page 26 of the specification of contents of the amendment and "Figures 1-3" in line 6 of the same page. [Also, in measuring the relationship between the Tranjon coefficient and oil temperature, It is. ” is inserted. (that's all)

Claims (3)

[Claims] (1) A traction drive fluid characterized by containing a hydrogenated trimeric or higher polymer of cyclic monoterpenoids. (2) The traction drive fluid according to claim 1, wherein the cyclic monoterpenoids are menthadienes, pinenes, or bicyclo[2.2.1]heptanes. (3) The traction drive fluid according to claim 1, which contains a trimeric or higher polymer hydrogenated product of cyclic monoterpenoids in a proportion of 0.1 to 90% by weight.