To obtain the subject fluid comprising a specific naphthenic ring-contg. hydrocarbon, exhibiting excellent power transmission and the outstanding ability as a fluid for hydraulic pressure control or wet clutch friction control as well, and therefore useful in e.g. automotive stepless speed change gears.
This fluid for traction drive comprises (A) a compound of formula I [R1 to R12 are each H or a (naphthenic ring-contg.) 1-8C alkyl, wherein two or more of R4, R5 and R8 are group Rs, respectively;], and, as necessary, furthermore (B) a mineral oil or a synthetic oil 150-800 in molecular weight, (C) a viscosity index improver [e.g. a (hydrogenated) ethylene-α-olefin copolymer with a number-average molecular weight of 800-150,000], (D) an ash-free dispersant and phosphorus-based additive, (E) a friction regulator having 6-30C alkyl or alkenyl group in the molecule but containing no ≥31C hydrocarbon group, and/or (F) a metal-based cleaning agent with a total base value of 20-450 mgKOH/g; by the way, the component A is prepared, for example, by reaction between a compound of formula II and a compound of formula III followed by nuclear hydrogenation of the reaction product.
| JP4860861 | How to make a lubricating base oil |
| JP2004176785 | ROLLING BEARING |
KONO JUNYA
SHIRAHAMA SHINICHI
OKAWA TETSUO
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