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US 6,638,417 B2Granted
Traction drive fluid
AssigneeNippon Mitsubishi Oil Corporation
InventorsNoboru Ishida, Shinichi Shirahama, Tetsuo Okawa, Shigeki Matsui
Life of this patent
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Abstract
A traction drive fluid is provided containing a naphthenic compound represented by the formula: wherein R1 is an alkyl group having 1 to 8 carbon atoms, R2 through R4 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and A is a naphthenic hydrocarbon group, a saturated polycyclic hydrocarbon group, a naphthenic ester group, or a naphthenic carbonate group.
Claims8
A traction drive fluid comprising one or more naphthenic compounds selected from the group consisting of those represented by formula (1):
- wherein R1 is an alkyl group having 1 to 8 carbon atoms, R2 through R4 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and A is a group selected from the group consisting of (i) a naphthenic hydrocarbon group represented by a formula selected from the group consisting of formulae (8), (12) and (13):
- wherein R9 through R12 and R37 through R44 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms;
- and
- (ii) a saturated polycyclic hydrocarbon group represented by formula (14) or (15):
- wherein R45 through R48 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms.
2 more elements
Dependencies are inferred from the claim text.