| 摘要 |
<p>An automatic transmission fluid composition is provided which has significantly higher coefficients of dynamic friction ( mu d) and static friction ( mu s) than those of the conventional automatic transmission fluid. In addition , the composition has a mu o/ mu d ratio close to 1.0, and a small change with the passage of time in frictional properties. The automatic transmission fluid composition comprises 0.01 to 20 % by weight of an overbasic oil-soluble metal salt (a) prepared by use of an alkaline-earth metal borate, and 0.01 to 15% by weight of a compound (b) having a long-chain alkyl group and an amino group in the same molecular structure on the basis of the total amount of composition as essential components, the balance being lubricating base oil.</p> |
