JP2016030803A - Lubricant - Google Patents

Abstract

A lubricating oil having a sufficiently high traction coefficient and a low pour point at a high temperature is provided.
The lubricating oil of the present invention comprises (A) a bicyclohydrocarbon compound dimer hydride and (B) a naphthenic saturated hydrocarbon compound, and the component (A) is measured alone at 100 ° C. and was traction coefficient when a and mu _a, the traction coefficient as measured by the component (a) (B) component were mixed with 100 ° C. when the mu _AB, improved mu represented by the following formula The component (A) and the component (B) are blended in such a ratio that the degree is 3 or more.
μ improvement = (μ _AB −μ _A ) × 1000
[Selection figure] None

Description

  The present invention relates to a lubricating oil, for example, an industrial lubricating oil such as a transmission oil and a hydraulic fluid for an automobile.

In recent years, fuel economy regulations have been strengthened in each country due to the growing awareness of environmental issues. In order to meet this increasing demand for fuel efficiency, continuously variable transmissions (CVTs) tend to be employed. Since the CVT can change continuously, the optimum engine speed can be selected according to the required output torque, and the fuel efficiency improvement effect is great. In addition, since the CVT shifts steplessly, there is no shift shock, and there is no decrease in engine speed at the time of upshifting, so acceleration performance is improved and drivability is excellent.
CVT includes a metal belt system, a chain system, a traction drive system, and the like, and all systems require high transmission efficiency, and examples of mounting on large vehicles and trucks are increasing. In particular, in the traction drive system, the power on the driving side is transmitted to the driven side via an oil film, so that development of a lubricating oil having a large traction coefficient is desired.
For example, a lubricating oil (traction drive fluid) containing a cyclic monoterpenoid trimer or a dicyclopentadiene (DCPD) polymer has been proposed (see Patent Documents 1 and 2). In order to further improve the traction coefficient, a lubricating oil containing a bicyclo [2.2.1] heptane dimer hydride and a specific saturated cyclic hydrocarbon has also been proposed (see Patent Document 3).

Japanese Patent Laid-Open No. 1-198692 Japanese Patent Laid-Open No. 1-230696 JP 2009-1756 A

  However, in the lubricating oil (traction drive fluid) described in Patent Documents 1 and 2, the traction coefficient is not so high. Further, even the lubricating oil described in Patent Document 3 cannot be said to have a sufficiently high traction coefficient at a high temperature (100 ° C.). In practice, it is also important that the pour point is low.

  An object of the present invention is to provide a lubricating oil having a sufficiently high traction coefficient and a low pour point at high temperatures.

In order to solve the above problems, the present invention provides a lubricating oil as shown below.
(1) A lubricating oil containing (A) a bicyclohydrocarbon compound dimer hydride and (B) a naphthenic saturated hydrocarbon compound, wherein the component (A) is measured alone at 100 ° C. the traction coefficient is mu _a, the traction coefficient as measured by the component (a) (B) component were mixed with 100 ° C. when the mu _AB, mu improve the degree represented by the following formula 3 Lubricating oil comprising the component (A) and the component (B) blended in such a ratio as described above.
μ improvement = (μ _AB −μ _A ) × 1000
(2) The lubricating oil according to (1), wherein the component (A) is a bicycloheptane dimer hydride.
(3) The lubricating oil according to (2), wherein the bicycloheptane dimer hydride is a bicyclo [2.2.1] heptane dimer hydride.
(4) A lubricating oil characterized in that the bicyclo [2.2.1] heptane dimer hydride described in (3) above is represented by the following formula (1).

（式中、Ｒ^１及びＲ^２は、各々独立に炭素数１から３までのアルキル基であり、Ｒ^３は、側鎖にメチル基もしくはエチル基が置換していてもよいメチレン基、エチレン基又はトリメチレン基であり、ａ及びｂは各々独立に０から３までの整数であり、ｃは０又は１を示す。）
（５）上記（１）から（４）までのいずれか１項に記載の潤滑油において、前記（Ｂ）成分が下記〔１〕、〔２〕および〔３〕のうち少なくともいずれか１種であることを特徴とする潤滑油。
〔１〕ノルボルネン類三量体水素化物
〔２〕水添石油樹脂
〔３〕水添テルペン樹脂
（６）上記（５）に記載の潤滑油において、前記ノルボルネン類三量体水素化物がビシクロ［２．２．１］ヘプタン三量体水素化物であることを特徴とする潤滑油。
（７）上記（１）から（６）までのいずれか１つに記載の潤滑油において、前記（Ｂ）成分の質量平均分子量が３５０以上１０００以下であることを特徴とする潤滑油。
（８）上記（１）から（７）までのいずれか１つに記載の潤滑油において、前記（Ｂ）成分と前記（Ａ）成分の質量比（Ｂ／Ａ）が１０／９０以上５０／５０以下であることを特徴とする潤滑油。
（９）上記（１）から（８）までのいずれか１つに記載の潤滑油において、１００℃動粘度が５ｍｍ^２／ｓ以上２５ｍｍ^２／ｓ以下であることを特徴とする潤滑油。
（１０）上記（１）から（９）までのいずれか１つに記載の潤滑油において、流動点が−１７．５℃以下であることを特徴とする潤滑油。
（１１）上記（１）から（１０）までのいずれか１つに記載の潤滑油において、当該潤滑油が無段変速機用であることを特徴とする潤滑油。

(In the formula, R ¹ and R ² are each independently an alkyl group having 1 to 3 carbon atoms, and R ³ is a methylene group or ethylene group in which a side chain may be substituted with a methyl group or an ethyl group. Or a trimethylene group, a and b are each independently an integer of 0 to 3, and c represents 0 or 1.)
(5) In the lubricating oil according to any one of (1) to (4) above, the component (B) is at least one of the following [1], [2] and [3] Lubricating oil characterized by being.
[1] Norbornene trimer hydride [2] Hydrogenated petroleum resin [3] Hydrogenated terpene resin (6) In the lubricating oil described in (5) above, the norbornene trimer hydride is bicyclo [2 2.1] A lubricating oil characterized by being a heptane trimer hydride.
(7) The lubricating oil according to any one of (1) to (6), wherein the component (B) has a mass average molecular weight of 350 or more and 1000 or less.
(8) In the lubricating oil according to any one of (1) to (7) above, the mass ratio (B / A) of the component (B) to the component (A) is 10/90 or more and 50 / Lubricating oil characterized by being 50 or less.
(9) The lubricating oil according to any one of (1) to (8) above, wherein the kinematic viscosity at 100 ° C. is 5 mm ² / s or more and 25 mm ² / s or less.
(10) The lubricating oil according to any one of (1) to (9), wherein the pour point is −17.5 ° C. or lower.
(11) The lubricating oil according to any one of (1) to (10), wherein the lubricating oil is for a continuously variable transmission.

  According to the present invention, it is possible to provide a lubricating oil having a sufficiently high traction coefficient at a high temperature and a low pour point.

The lubricating oil in this embodiment (hereinafter, also simply referred to as “the present lubricating oil”) includes (A) a bicyclohydrocarbon compound dimer hydride and (B) a naphthenic saturated hydrocarbon compound, the traction coefficient measured at 100 ° C. the a) component alone and mu _a, the (a) when the traction coefficient when the the components by mixing the component (B) were measured at 100 ° C. was mu _AB Further, the component (A) and the component (B) are blended in such a ratio that the degree of improvement in μ represented by the following formula is 3 or more.
μ improvement = (μ _AB −μ _A ) × 1000
Hereinafter, an embodiment of the present lubricating oil will be described in detail.

[(A) component]
(A) component which comprises this lubricating oil is a bicyclo hydrocarbon compound dimer hydride. By blending such a predetermined component together with the component (B) described later, the present lubricating oil has an exceptional effect of improving the traction coefficient at high temperatures.
The bicyclohydrocarbon compound dimer hydride is preferably a bicycloheptane dimer hydride, more preferably a bicyclo [2.2.1] heptane dimer hydride from the viewpoint of the above-described effects. As the bicyclo [2.2.1] heptane dimer hydride, a compound represented by the following formula (1) is particularly preferable from the viewpoint of improving the traction coefficient.

In Formula (1), R ¹ and R ² are each independently an alkyl group having 1 to 3 carbon atoms. R ³ is a methylene group, an ethylene group or a trimethylene group which may be substituted with a methyl group or an ethyl group on the side chain. a and b are each independently an integer of 0 to 3, and c represents 0 or 1. Moreover, the compound represented by following formula (2) is preferable from a viewpoint of a traction coefficient improvement among the compounds represented by Formula (1).

  In the formula (2), d is 1 or 2, and e is 2 or 3. Examples of the compound represented by the formula (2) include endo-2-methyl-exo-3-methyl-exo-2-[(exo-3-methylbicyclo [2.2] represented by the following formula (3). .1] hepto-exo-2-yl) methyl] bicyclo [2.2.1] heptane, and endo-2-methyl-exo-3-methyl-exo-2- [ (Exo-2-methylbicyclo [2.2.1] hept-exo-3-yl) methyl] bicyclo [2.2.1] heptane and endo-2-methyl- represented by the following formula (5) exo-3-methyl-exo-2-[(endo-3-methylbicyclo [2.2.1] hept-endo-2-yl) methyl] bicyclo [2.2.1] heptane and the following formula (6 ) Endo-2-methyl-exo-3-me Le-exo-2 - [(endo-2-methylbicyclo [2.2.1] hept-endo-3- yl) methyl] bicyclo [2.2.1] can be exemplified preferably heptane.

As the above-described component (A), one type may be used alone, or two or more types may be used in arbitrary combination.
(A) A component can be preferably manufactured by the method described in Unexamined-Japanese-Patent No. 2009-1756 or 2013-231204, for example. That is, bicyclo [2.2.1] heptane dimer hydride can be easily obtained by synthesizing a bicycloheptane derivative using dicyclopentadiene as a raw material, followed by dehydration reaction, dimerization reaction, and hydrogenation reaction. It is done.

[Component (B)]
The component (B) constituting the lubricating oil is at least one of the following [1], [2] and [3].
[1] Norbornene trimer hydride [2] Hydrogenated petroleum resin [3] Hydrogenated terpene resin By blending such a predetermined component together with the above-mentioned component (A), this lubricating oil The special effect of improving the traction coefficient below is achieved.

As the [1] norbornene trimer hydride described above, bicycloheptane trimer hydride is preferable, and bicyclo [2.2.1] heptane trimer hydride is more preferable. Examples of the bicyclo [2.2.1] heptane trimer hydride include 3-methyl-2-[(3-methylbicyclo [2.2.1] hept-2-yl) methyl] -2- [ (2,3-Dimethylbicyclo [2.2.1] hept-2-yl) methyl] bicyclo [2.2.1] heptane and 2-[(bicyclo [2.2.1] hept-2-yl Preferred examples include methyl] -2-[(2-methylbicyclo [2.2.1] hept-2-yl) methyl] bicyclo [2.2.1] heptane.
Such a norbornene trimer hydride can be preferably produced, for example, by the method described in JP-A-1-198692.

  Preferred examples of the above [2] hydrogenated petroleum resin include a hydride of a dicyclopentadiene polymer or a hydride of a copolymer of dicyclopentadiene and an aromatic compound. Such hydrogenated petroleum resins are commercially available, for example, Imabe (P-100, P-125, P-140) manufactured by Idemitsu Kosan Co., Ltd. and Alcon (P-90, P-100, P manufactured by Arakawa Chemical Co., Ltd.). -125, P-140) and Quinton (1325, 1345) manufactured by Nippon Zeon.

  Preferred examples of the above-mentioned [3] hydrogenated terpene resin include hydrides of polymers of cyclic terpenes such as pinene and camphene, and hydrides of copolymers of cyclic terpenes and aromatic compounds. be able to. Such hydrogenated terpene resins are commercially available, and examples thereof include Clearon (P-85, P-105, P-115, P-125, P-135, P-150, etc.) manufactured by Yashara Chemical Co., Ltd.

(B) As a component, it is preferable that a mass average molecular weight is 350-1000, and a more preferable mass average molecular weight is 350-700. When the mass average molecular weight is 350 or more, the kinematic viscosity at 100 ° C. can be appropriately increased when the component (B) is mixed with the component (A). For example, even when the blending amount of the component (B) is small, it becomes easy to control the 100 ° C. kinematic viscosity of the lubricating oil to a preferable value of 5 mm ² / s or more. Further, when the mass average molecular weight of the component (B) is 1000 or less, the solubility in the component (A) can be sufficiently increased.

[This lubricant]
This lubricating oil contains the component (A) and the component (B) described above, the traction coefficient when the component (A) is measured alone at 100 ° C. is μ _A, and the component (A) is the component (B) When the component is mixed and measured at 100 ° C. and the traction coefficient is μ _AB , the component (A) and the component (B) are in such a ratio that the degree of μ improvement represented by the following formula is 3 or more. The ingredients are blended.
μ improvement = (μ _AB −μ _A ) × 1000
The above-mentioned μ improvement degree can be set to 3 or more by increasing the mixing ratio of the component (B) to the component (A). The degree of improvement in μ is preferably 4 or more, more preferably 5 or more, and further preferably 6 or more.

Since the lubricating oil used for CVT also plays a role as a normal lubricating oil in CVT, it needs to have a high kinematic viscosity that can maintain a sufficient oil film even at high temperatures. The lubricating oil preferably has a kinematic viscosity at 100 ° C. of 5 mm ² / s or more, and more preferably 7 mm ² / s or more. On the other hand, in order to increase the fluidity of the lubricating oil and reduce energy loss due to stirring resistance, the 100 ° C. kinematic viscosity is preferably 25 mm ² / s or less, more preferably 20 mm ² / s or less.

Here, the mass ratio (B / A) of the component (B) and the component (A) is preferably 10/90 or more and 50/50 or less, and more preferably 30/70 or more and 50/50 or less. When the mass ratio (B / A) is 10/90 or more, the 100 ° C. kinematic viscosity of the lubricating oil is controlled to a preferable value of 5 mm ² / s or more, further 7 mm ² / s or more, It becomes easy to make the improvement degree 3 or more.
Moreover, it is preferable for the mass ratio (B / A) to be 50/50 or less because the pour point of the lubricating oil can be effectively lowered. The pour point of the lubricating oil is preferably -17.5 ° C or lower.

[Other ingredients]
In the lubricating oil, other additives such as a viscosity index improver, a pour point depressant, an antiwear agent, a friction modifier, and an ashless dispersant are added as necessary, as long as the effects of the present invention are not impaired. A rust inhibitor, a metal deactivator, an antifoaming agent, an antioxidant, and the like may be blended.

Examples of the viscosity index improver include polymethacrylate, dispersed polymethacrylate, olefin copolymer (for example, ethylene-propylene copolymer), dispersed olefin copolymer, styrene copolymer (for example, styrene- Diene copolymer, styrene-isoprene copolymer, etc.). The blending amount of the viscosity index improver is about 0.5% by mass or more and 15% by mass or less based on the total amount of the lubricating oil from the viewpoint of blending effect.
As the pour point depressant, for example, polymethacrylate having a mass average molecular weight of about 10,000 to 150,000 is used. A preferable blending amount of the pour point depressant is about 0.01% by mass or more and 10% by mass or less based on the total amount of the lubricating oil.

Examples of the antiwear agent include sulfur type antiwear agents such as thiophosphate metal salts (Zn, Pb, Sb, etc.) and thiocarbamic acid metal salts (Zn, etc.), phosphate esters (tricresyl phosphate), etc. Phosphorous wear inhibitors can be mentioned. A preferable blending amount of the antiwear agent is about 0.05% by mass or more and 5% by mass or less based on the total amount of the lubricating oil.
Examples of the friction modifier include polyhydric alcohol partial esters such as neopentyl glycol monolaurate, trimethylolpropane monolaurate, and glycerin monooleate (oleic acid monoglyceride). A preferable blending amount of the friction modifier is about 0.05% by mass or more and 4% by mass or less based on the lubricating oil.
Examples of the ashless dispersant include succinimides, boron-containing succinimides, benzylamines, boron-containing benzylamines, succinic esters, monovalent or divalent typified by fatty acids or succinic acid. Examples thereof include amides of carboxylic acids. A preferable blending amount of the ashless dispersant is about 0.1% by mass or more and 20% by mass or less based on the total amount of the lubricating oil.

Examples of the rust inhibitor include fatty acid, alkenyl succinic acid half ester, fatty acid soap, alkyl sulfonate, polyhydric alcohol fatty acid ester, fatty acid amide, oxidized paraffin, alkyl polyoxyethylene ether and the like. A preferable blending amount of the rust preventive is about 0.01% by mass or more and 3% by mass or less based on the total amount of the lubricating oil.
As the metal deactivator, for example, benzotriazole, thiadiazole and the like are used alone or in combination of two or more. A preferable blending amount of the metal deactivator is about 0.01% by mass or more and 5% by mass or less based on the total amount of the lubricating oil.

As the antifoaming agent, for example, a silicone compound, an ester compound, or the like is used alone or in combination of two or more. A preferable blending amount of the antifoaming agent is about 0.05% by mass or more and 5% by mass or less based on the total amount of the lubricating oil.
As the antioxidant, hindered phenol-based or amine-based, zinc alkyldithiophosphate (ZnDTP) or the like is preferably used. As the phenol type, bisphenol type and ester group-containing phenol type are particularly suitable. As the amine system, a dialkyldiphenylamine system or a naphthylamine system is suitable. A preferable blending amount of the antioxidant is about 0.05% by mass or more and 7% by mass or less based on the total amount of the lubricating oil.

  Since this lubricating oil has a large traction coefficient even at high temperatures, transmission efficiency can be improved and fuel consumption can be greatly reduced. Moreover, the performance which was excellent as CVT use can be exhibited by making 100 degreeC kinematic viscosity into an appropriate value. Therefore, for example, it can be mounted on a high torque capacity vehicle or a large vehicle. Moreover, since this lubricating oil has a low pour point, it is excellent in practicality. Further, by blending the additive for CVT, the friction coefficient between metals of the lubricating oil can be maintained higher, and the power transmission capacity can be further improved. Therefore, it is suitable for CVT such as a belt type and a chain type.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.
[Method for evaluating properties and performance of sample oil]
The properties of the lubricating oil (sample oil) and various performances (traction coefficient (μ), μ improvement degree) in each example were determined by the following methods.
(1) Kinematic viscosity Based on JIS K2283, the kinematic viscosity in 100 degreeC was measured.
(2) Pour point Measured according to JIS K 2269.

(3) Traction coefficient (μ)
The traction coefficient at 100 ° C. was measured with a two-cylinder rolling and sliding friction tester. That is, one of the cylinders of the same size in contact (diameter 40 mm, thickness 20 mm, driven type is a flat type with a curvature radius of 20 mm, and the driving side is a flat type without crowning) is continuously constant at the other rotation speed. The traction coefficient was obtained by applying a load of 147.1 N to the contact portion of both cylinders by a weight and measuring the tangential force generated between both cylinders, that is, the traction force. This cylinder was made of mirror-finished bearing steel SCM420, the average peripheral speed was 7.0 m / s, and the maximum hertz contact pressure was 1.24 GPa. When measuring the traction coefficient at a fluid temperature (oil temperature) of 100 ° C, the oil temperature is raised from 40 ° C to 140 ° C by heating the oil tank with a heater, and the traction coefficient at a slip rate of 5% is obtained. Asked.

(4) Degree of improvement of μ The traction coefficient (μ at 100 ° C.) of fluid 1 described later is μ _1, and the traction coefficient (μ at 100 ° C.) of a mixed fluid obtained by blending a predetermined amount of other fluid with this fluid 1 ) Is μ _x, and the degree of improvement in μ was determined by the following formula.
μ improvement = (μ _x −μ ₁ ) × 1000

[Manufacturing method and preparation method of various fluids]
<Production Example 1: Method for producing fluid 1>
The fluid 1 as the component (A) was produced as follows.
(1) Preparation of raw material olefin A 2 L stainless steel autoclave was charged with 561 g (8 mol) of crotonaldehyde and 352 g (2.67 mol) of dicyclopentadiene, and reacted by stirring at 170 ° C. for 3 hours.
After cooling the reaction solution to room temperature, 18 g of sponge nickel catalyst (M-300T manufactured by Kawaken Fine Chemical Co., Ltd.) was added, and hydrogenation was performed at a hydrogen pressure of 0.9 MPa · G and a reaction temperature of 150 ° C. for 4 hours. After cooling, the catalyst was filtered off and the filtrate was distilled under reduced pressure to obtain 565 g of a 105 ° C./2.66 kPa fraction. As a result of analyzing this fraction by mass spectrum and nuclear magnetic resonance spectrum, this fraction was found to be 2-hydroxymethyl-3-methylbicyclo [2.2.1] heptane and 3-hydroxymethyl-2-methylbicyclo [2. 2.1] Heptane was confirmed. Next, 20 g of γ-alumina (N612N, manufactured by JGC Chemical Co., Ltd.) was placed in a quartz glass flow-through atmospheric pressure reaction tube having an outer diameter of 20 mm and a length of 500 mm, a reaction temperature of 285 ° C., and a mass space velocity (WHSV). The dehydration reaction was performed at ¹ hr ⁻¹ , and 2-methylene-3-methylbicyclo [2.2.1] heptane and 3-methylene-2-methylbicyclo [2.2.1] heptane 55% by mass, 2,3- 2-hydroxymethyl-3-methylbicyclo [2.2.1] heptane and 3-hydroxymethyl-2-methylbicyclo [2. 2.1] 490 g of a dehydration reaction product of heptane was obtained.

(2) Preparation of dimer 8 g of boron trifluoride diethyl ether complex and 400 g of the olefin compound obtained in the above (1) were placed in a 1 L four-necked flask and stirred at 0 ° C. using a mechanical stirrer. The dimerization reaction was performed for 6 hours. The reaction mixture was washed with dilute aqueous NaOH and saturated brine.

(3) Hydrogenation step 300 g of the olefin compound obtained in (2) above and 12 g of nickel / diatomaceous earth catalyst for hydrogenation (N-113 manufactured by JGC Chemical Co., Ltd.) were added to a 1 L autoclave, and the hydrogen pressure was 3 MPa · G, reaction. Hydrogenation is carried out at a temperature of 80 ° C. for a reaction time of 5 hours, and further at a reaction temperature of 180 ° C. for a reaction time of 4 hours. After completion of the reaction, the catalyst is removed by filtration, and the filtrate is distilled under reduced pressure to obtain the desired dimer hydrogen. 240 g of the compound was obtained (fluid 1).

<Production Example 2: Method for producing fluid 2>
Fluid 2 (norbornene trimer hydrogenated product) as component (B) was produced as follows.
The residue obtained by vacuum distillation in the (3) hydrogenation step in Production Example 1 was used as fluid 2.

<Method for preparing fluids 3, 4 and 5>
The fluids 3, 4 and 5 as the component (B) were obtained as follows and used as they were.
Fluid 3: Idemitsu Kosan Imabe P-100
Fluid 4: Quinton 1325 manufactured by Nippon Zeon
Fluid 5: Clearon P85 manufactured by Yasuhara Chemical

[Examples 1 to 10, Comparative Examples 1 to 4]
Lubricating oil compositions (sample oils) having the composition shown in Tables 1 and 2 were prepared. Tables 1 and 2 also show the properties and various performances of each sample oil.

１）鉱油：パラフィン系、１００℃動粘度 ３０．９ｍｍ^２／ｓ

1) Mineral oil: paraffinic, 100 ° C. kinematic viscosity 30.9 mm ² / s

〔Evaluation results〕
As shown in Table 1, each of the sample oils (Examples 1 to 10) satisfying the predetermined configuration of the present invention has a traction coefficient (μ) at a high temperature (100 ° C.) than that of the fluid 1 (Comparative Example 1, standard). Can be understood to be sufficiently high. In addition, the pour point is low and the utility is excellent.
On the other hand, the comparative example 2 uses the norbornene trimer hydride which is the component (B) as a main component, and although p is high, the pour point is too high and the practicality is inferior. Further, the 100 ° C. kinematic viscosity is too high, which is problematic from the viewpoint of improving fuel consumption. Comparative Example 3 is a sample oil in which the component (B) is mixed with the component (A), but the mixing ratio of the component (B) is small and the improvement of μ is not recognized. Comparative Example 4 is a mixture of component (A) with mineral oil, but there is no improvement in μ, but rather a significant decrease.

Claims (11)

A lubricating oil comprising (A) a bicyclohydrocarbon compound dimer hydride and (B) a naphthenic saturated hydrocarbon compound,
The traction coefficient when the component (A) is measured alone at 100 ° C. is μ _A ,
When the traction coefficient when the component (B) is mixed with the component (A) and measured at 100 ° C. is μ _AB ,
Lubricating oil, wherein the component (A) and the component (B) are blended in such a ratio that the degree of improvement in μ expressed by the following formula is 3 or more.
μ improvement = (μ _AB −μ _A ) × 1000 The lubricating oil according to claim 1,
The lubricating oil characterized in that the component (A) is a bicycloheptane dimer hydride. The lubricating oil according to claim 2,
Lubricating oil characterized in that the bicycloheptane dimer hydride is a bicyclo [2.2.1] heptane dimer hydride. In the lubricating oil according to claim 3,
The bicyclo [2.2.1] heptane dimer hydride is represented by the following formula (1).

(In the formula, R ¹ and R ² are each independently an alkyl group having 1 to 3 carbon atoms, and R ³ is a methylene group or ethylene group in which a side chain may be substituted with a methyl group or an ethyl group. Or a trimethylene group, a and b are each an integer of 0 to 3, and c represents 0 or 1.) In the lubricating oil according to any one of claims 1 to 4,
The lubricating oil characterized in that the component (B) is at least one of the following [1], [2] and [3].
[1] Norbornene trimer hydride [2] Hydrogenated petroleum resin [3] Hydrogenated terpene resin In the lubricating oil according to claim 5,
Lubricating oil characterized in that the norbornene trimer hydride is a bicyclo [2.2.1] heptane trimer hydride. In the lubricating oil according to any one of claims 1 to 6,
The lubricating oil, wherein the component (B) has a mass average molecular weight of 350 or more and 1000 or less. In the lubricating oil according to any one of claims 1 to 7,
Lubricating oil characterized by mass ratio (B / A) of said (B) component and said (A) component being 10/90 or more and 50/50 or less. In the lubricating oil according to any one of claims 1 to 8,
A lubricating oil having a kinematic viscosity at 100 ° C. of 5 mm ² / s or more and 25 mm ² / s or less. In the lubricating oil according to any one of claims 1 to 9,
A lubricating oil having a pour point of -17.5 ° C or lower. In the lubricating oil according to any one of claims 1 to 10,
A lubricating oil characterized in that the lubricating oil is for a continuously variable transmission.