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US 5,851,962 AGranted
Lubricant composition for wet clutch or wet brake
AssigneeEthyl Japan Corporation
InventorKuniaki Kaga
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AssigneeEthyl Japan Corporation
InventorKuniaki Kaga
Estimating the term…
A lubricant composition for a wet clutch or a wet brake is disclosed, which comprises a base oil having added thereto an inorganic phosphorus compound which may contain sulfur atoms and/or oxygen atoms as its constituent elements, or an amine salt thereof, or having added thereto said inorganic phosphoric compound or an amine salt thereof, and an organic polyol compound having at least two hydroxyl groups in one molecule. The composition which exhibits excellent frictional properties in a wet clutch or a wet brake, in particular, provides a high .mu.d (dynamic friction coefficient) and a high .mu.s (static friction coefficient), shows good prevention of vibration in a lock-up clutch (which is imparted with good durability for preventing such vibration, has friction coefficients free from the temperature dependence, and is effective as a shock absorber oil, a power steering oil, a hydraulic suspension oil, etc.
A lubricant oil composition for a wet clutch or a wet brake lubricant comprising a base oil having added thereto (i) from 0.005 wt % to 0.1 wt % of an inorganic phosphorus compound selected from the group consisting of phosphoric acid and phosphorous acid or an amine salt thereof, and (ii) from 0.01 wt % to 4 wt % of at least one member selected from the group consisting of an organic polyol compound having at least two hydroxyl groups in the molecule and a partially-esterified organic polyol compound having at least two hydroxyl gr oups in the molecule.
A lubricating oil composition that is formulated for use as a wet clutch or a wet brake lubricant, and that comprises a base oil having a kinematic viscosity of 2 to 50 cSt at 100.degree. C. having added thereto (i) from 0.01 wt % to 0.05 wt % of phosphorus as at least one inorganic phosphorus compound selected from the group consisting of phosphorous acid and phosphoric acid, and amine salts thereof;
Dependencies are inferred from the claim text.