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A lubricating oil composition for electric vehicle or hybrid vehicle, which preparing by blending, (A) a base oil; and (B-1) a polyamide, (B-2) a polyol ester, or both, wherein the base oil (A) comprises (A-1) a synthetic oil having a kinematic viscosity at 100° C. Of 1.0 to 10.0 mm 2/s.2.
The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein the component (A-1) is a poly-α-olefin, a hydrogenated product of a poly-α-olefin, or both.3. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein a blending amount of the component (A-1) is from 1.0 to 10.0% by mass on the basis of a total amount of the composition.4.
The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein the composition comprises the component (B-1) which is a reaction product between an amine compound and a carboxylic acid compound.5. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein the composition comprises the component (B-2) which is a reaction product between a polyol and a carboxylic acid compound.6. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein the composition comprises the component (B-2) which is a partial ester of a polyol and a fatty acid having 12 to 24 carbon atoms.7. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, wherein a total blending amount of the component (B-1) and the component (B-2) is from 0.01 to 5.0% by mass on the basis of the total amount of the composition.8. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, which has a kinematic viscosity at 100° C. Of 3 to 15 mm 2/s.9.
The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, which has a viscosity index of 100 or more.10. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, which has a volume resistivity of 1.0×10 7 Ωm or more.11. The lubricating oil composition for electric vehicle or hybrid vehicle according to claim 1, which has a Brookfield viscosity at −40° C. Of 30,000 mPas or less.
TECHNICAL FIELDThe present invention relates to a lubricating oil composition for electric vehicle or hybrid vehicle. BACKGROUND ARTHitherto, a lubricating oil composition for a transmission has been required to have gear properties and clutch properties.The gear properties indicate, for example, seizure resistance or shear stability under a high load. In addition, the clutch properties indicate, for example, suppression of shift shock generated when a coefficient of friction increases at the time of clutch connection.In addition, in recent years, with the spread of hybrid vehicles or electric cars, a lubricating oil composition for motor cooling is used, too. Since there is a case where such a lubricating oil composition comes into direct contact with a motor and cools it, or the like, the lubricating oil composition is required to have high insulating properties together with cooling properties.In addition, in recent years, it is also required to make a lubricating oil composition have a combination of plural applications. For example, there is exemplified a case where by providing a lubricating oil composition for a transmission with cooling properties and insulating properties, the lubricating oil composition is made to have a combined use for a transmission and motor cooling. Such a lubricating oil composition can be expected to be used as a lubricating oil composition for electric vehicle or hybrid vehicle.As general lubricating oil compositions for a transmission, technologies of PTLs 1 to 3 are proposed. CITATION LIST Patent LiteraturePTL 1: JP 2-46635 APTL 2: JP 2008-208221 APTL 3: JP 2011-168677 A DISCLOSURE OF INVENTION Technical ProblemPTL 1 proposes a lubricating oil composition for a wet clutch or a wet brake containing a specified phosphoric acid ester amine salt and a specified fatty acid ester.
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The lubricating oil composition of PTL 1 is one realizing performances, such as good friction properties, thermal oxidative stability, corrosion resistance, rust preventing properties, etc.PTL 2 proposes a lubricating oil composition for an automobile transmission containing an ethylene-propylene copolymer having a specified viscosity in a base oil having a specified viscosity. The lubricating oil composition of PTL 2 is one realizing a low viscosity as well as an excellent fatigue life.PTL 3 proposes a lubricating oil composition for a continuously variable transmission containing a poly-α-olefin having specified properties and a polymethacrylate having a specified mass average molecular weight. The lubricating oil composition of PTL 3 is one realizing a low viscosity, a high viscosity index, a stable shear stability, and a long fatigue life.However, all of the lubricating oil compositions of PTLs 1 to 3 could not be simultaneously satisfied with gear properties, clutch properties, cooling properties, and electric insulating properties.An object of the present invention is to provide a lubricating oil composition for electric vehicle or hybrid vehicle having excellent gear properties, clutch properties, cooling properties, and electric insulating properties. Solution to ProblemIn order to solve the aforementioned problem, the present invention provides a lubricating oil composition for electric vehicle or hybrid vehicle, which preparing by blending (A) a base oil and (B-1) a polyamide and/or (B-2) a polyol ester, the base oil (A) including (A-1) a synthetic oil having a kinematic viscosity at 100° C. Of 1.0 to 10.0 mm 2/s. Advantageous Effects of InventionThe lubricating oil composition for electric vehicle or hybrid vehicle of the present invention is able to simultaneously satisfy gear properties (e.g., seizure resistance or shear stability under a high load), clutch properties (e.g., suppression of shift shock at the time of clutch connection), cooling properties, and electric insulating properties. DESCRIPTION OF EMBODIMENTSAn embodiment of the present invention (hereinafter also referred to as “present embodiment”) is hereunder described.The lubricating oil composition for electric vehicle or hybrid vehicle of the present embodiment is one preparing by blending (A) a base oil and (B-1) a polyamide and/or (B-2) a polyol ester, the base oil (A) including (A-1) a synthetic oil having a kinematic viscosity at 100° C.
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