Hydraulic automatic transmission fluid with superior friction performance
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United States of America Patent
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Mar 3, 1981
Grant Date -
N/A
app pub date -
Nov 22, 1978
filing date -
Nov 22, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The friction performance of a lubricating oil composition that has been compounded to serve as a functional fluid that is particularly useful in mechanical and hydraulic units containing wet clutches, for example an automotive automatic transmission, is greatly improved by the incorporation of a combination of a friction modifier of the type comprising a straight chain alkenyl or alkyl C.sub.4 to C.sub.10 dicarboxylic acid or the reaction product of an aldehyde/tris hydroxymethyl aminomethane adduct and a long chain dicarboxylic acid anhydride such as an alpha-olefin succinic anhydride; with an overbased detergent salt such as an alkali metal salt or alkaline earth metal salt of a hydrocarbyl sulfonic acid, an alkyl phenol or a sulfurized alkyl phenol, in certain proportions.
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