Traction drive fluid
AssigneeNippon Mitsubishi Oil Corporation
InventorsNoboru Ishida, Junya Kohno, Shinichi Shirahama, Tetsuo Okawa
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Abstract
A traction drive fluid comprises a tractant selected from the specific types of hydrocarbons, carboxylates and carbonate, optionally an effective amount of a base oil selected from a mineral oil and a synthetic oil and additives selected from a viscosity index improver, a ashless dispersant, a phosphorus-containing additive, a friction adjusting agent, a metallic detergent, an oxidation inhibitor, a polar additive, a corrosion inhibitor, a rubber swelling agent, a antifoamer and a colorant.
Claims10
A traction drive fluid which comprises a tractant selected from the group consisting of naphthenic hydrocarbons (A) and (B), naphthenic carboxylates (C) and (D) and a naphthenic carbonate (E),
- said naphthenic hydrocarbon (A) being represented by the formula
- wherein among R1 through R8, R4 is a C1-C8 alkyl group which may have a naphthene ring and the remainders each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- said naphthenic hydrocarbon (B) being represented by the formula
- wherein R9 through R20 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring, at least more than two members selected arbitrarily from R12, R13 and R16 each are a C1-C8 alkyl group which may have a naphthene ring, at least one member selected arbitrarily from R9, R11, R18 and R20 is a C1-C8 alkyl group which may have a naphthene ring;
- said naphthenic carboxylate (C) being represented by the formula
- wherein R21, R22, R23, R24, R25 and R26 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- said naphthenic carboxylate (D) being represented by the formula
- wherein R27, R28, R29, R30, R31 and R32 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- and
- said naphthenic carbonate (E) being represented by the formula
- wherein R33, R34, R35, R36, R37 and R38 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring.
A traction drive fluid which comprises a tractant wherein said tractant is a naphthenic hydrocarbon (B) represented by the formula
- and which fluid further comprises a base oil of synthetic oil selected from the group consisting of those represented by the formulae
- wherein R39 through R48 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- wherein R61 through R66 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- wherein R67 through R72 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- wherein R73 through R78 each are a hydrogen atom or a C1-C8 alkyl group which may have a naphthene ring;
- and
- wherein R79 through R86 each are a hydrogen atom or a C1-C alkyl group which may have a naphthene ring.
A traction drive fluid which comprises a tractant wherein said tractant is a naphthenic hydrocarbon represented by the formula
- and which fluid further comprises a base oil selected from the group consisting of a mineral oil and a synthetic oil having a molecular weight within a range of about 150 to 800 and an additive selected from the group consisting of a viscosity index improver, an ashless dispersant, a phosphorus-containing additive, a friction adjusting agent, an additive for enhancing the coefficient of friction, a metal containing detergent, an oxidation inhibitor, and an extreme pressure additive.
Dependencies are inferred from the claim text.