Lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsAkio Kojima, Yukio Yoshida, Kenichi Ogata, Shota Kato, Keiichi Narita
Life of this patent
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Abstract
A lubricating oil composition may have a high flash point, a low pour point, and excellent electrical insulation, while having excellent cooling performance. Such a lubricating oil composition may include a base oil (A), wherein the base oil (A) includes at least one synthetic oil (A1) selected from a polyalkylene glycol having a specific degree of polymerization and a polyvinyl ether having a specific degree of polymerization.
Claims20
A method of cooling an electric vehicle device, the method comprising:
- contacting a lubricating oil composition with the electric vehicle device, thereby cooling the electric vehicle device,
- wherein the lubricating oil composition comprises a base oil (A), the base oil (A) comprising up to 70% by mass mineral oil and in a range of from 30 to 100% by mass:
- (A1) a polyalkylene glycol having a structural unit of formula (1):
- R1 and R2 each being independently H or a monovalent hydrocarbon group having 1 to 18 carbon atoms, R3 being a methyl group, and n being an integer in a range of from 3 to 5;
- and/or
- (A2) a polyvinyl ether having a structural unit of formula (2)
- R8 being a divalent hydrocarbon group having 2 to 10 carbon atoms, R9 being a methyl group, m being 3 or 4, and q being 0.
A cooling system configured for an cooling electric vehicle device, the system comprising a lubricating oil composition,
- wherein the lubricating oil composition comprises a base oil (A), the base oil (A) comprising up to 70% by mass mineral oil and in a range of from 30 to 100% by mass:
- (A1) a polyalkylene glycol having a structural unit of formula (1):
- R1 and R2 each being independently H or a monovalent hydrocarbon group having 1 to 18 carbon atoms, R3 being a methyl group, and n being an integer in a range of from 3 to 5;
- and/or
- (A2) a polyvinyl ether having a structural unit of formula (2)
- R8 being a divalent hydrocarbon group having 2 to 10 carbon atoms, R9 being a methyl group, m being 3 or 4, and q being 0.
Dependencies are inferred from the claim text.