SAE TECHNICAL PAPER SERIES Friction Characteristics Compatibility of DEXRON@-IINMERCON@ ATFs for Japanese Automatic Transmissions Kohei Matsuo, Shin Saeki, and Fumitaka Ito Japan Energy Corp. Reprinted from: Lubricants for Passenger Car and Heavy Duty Diesel Engines (SP-1304) OCT i-8 5 1V7 The Engineering Society =For Advancing Mobility and sea ~ir and space. INTERNATIONAL International Fall Fuels & Lubricants Meeting & Exposition Tulsa, Oklahoma October 13-16,1997 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (412)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018.. .. . .- - law. ~w~ntdaesnotede~todher16r;dsof~ ~on,foradvemsingorpromotionalpu, formeating newcollectiveworks, or SAE routinely st& printed papers for a period of three years following date of publication. Directyourordersto SAECustomerSalesand~cfion DGw'bnent. To request permissionto reprintatedmical paperorpermksiontousew~ghtedSAE puMicationsinotherworks,wntadtheSAE PublicationsGmup. AII SAE-rs. standards. and selected thoseofSAE Theautiwrissdely~r)~iiMeforthewntentofthepaper. Aprocessis available bv which discussionswill be urintedwith the uauer if it is uublished in SAE rans sac ti om. For permission to publiih this paper in f;llor in contad the SAE WiGrwp. Printedin USA Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018Friction Characteristics Compatibility of DEXRONB-III/MERCONB ATFs for Japanese Automatic ~ransmksions Copyright 1997 Society of Automotive Engineers, Inc. ABSTRACT Using the SAE N0.2 clutch friction test machine, we evaluated the friction characteristics of six DEXRONe-!J I MERCON" ATFs and compared with the friction characteristics of the genuine ATFs. The test conditions were those specified by two big Japanese motor companies. We also evaluated the anti-shudder durability of DEXRONe-El I MERCON" ATFs using a modified LVFA. As the results, the four ATFs showed significantly lower static friction coefficient ( p S) compared with each genuine ATF in both the SAE N0.2 friction tests. And we found that one ATF was equivalent to the genuine ATF in the anti-shudder durability. INTRODUCTION Recently the slip control lock-up clutch mechanism is attracting attention as a fuel-saving technology for automatic transmission (AT). Some of the Japanese automobile manufacturers now sell AT cars containing this mechanism. The slip control AT uses genuine automatic transmission fluid (ATF) having anti-shudder characteristics('), which are not required by DEXRONa- IU I MERCON" standard. Thus, Japanese automobile manufacturers recommend that genuine ATFs compatible with their ATs such as slip control ATs be used. However, DEXRONe-IU I MERCON" ATF is also available on the market, and ATF is often replaced with non-genuine ATFs. In such cases, the compatibility of the ATF with the friction characteristics of the wet clutch is especially important. Kohei Matsuo, Shin Saeki, and Fumitaka Ito Japan Energy Corp. DEXRONe- El I MERCON" ATF with Japanese automobiles in view of the above standardization. In this study, we evaluated the friction characteristics of six types of DEXRONCEl I MERCON" ATFs (five types of commercial ATF in Japan and one commercial ATF in the U.S.A.) using the SAE NO. 2 clutch friction test machine, and compared the results with the friction characteristics of the genuine ATFs. The test conditions were those specified by twc major Japanese automobile manufacturers. We also carried out a low velocity friction test on the ATFs to evaluate their anti-shudder durability. PROPERTIES OF ATFS TESTED AND FRICTION CHARACTERISTIC TEST CONDITIONS Table 1 shows the properties of the ATFs tested. ATF A is superior to the others in shear stability and oxidation stability, except for friction characteristics. Table 2 shows the SAE NO. 2 clutch frict