The Engineering Society For Advancing Mobility Land Sea Air and Space*?, 400 COMMONWEALTH DRIVE WARRENDALE, PA ISODS AE technical Paper Series 881674 Evaluation of Vibration-Prewentive Properties of Lubricating Oils in Wet Friction Plates and Retention of Such Properties Using a Friction Tester Mamoru Miyazaki and Michio Hoshino Mitsubishi Oil Co., Ltd. International Fuels and Lubricants Meeting and Exposition Portland, Oregon October 10-13,1988 Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018The appearance of the code at the bottom of the first page of this paper indicates SAE's consent that copies of the paper may be made lor persona! or internet use, or for the personal or interna! use of specific clients. This consent is given on '.he con­ dition, however, that the copier pay the stated per article copy fee through the Copyright Clearance Center, Inc., Operations Center, P.O. Box 765, Schenectady, NY. 12301, for copying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. Papers published prior to 1978 may also be copied at a per paper fee of $2.50 under the above staled conditions. SAE routinely slocks printed papers for a period of three years following date of publication. Direct your orders to SAE Order Deparlment. To obtain quantity reprint rates, permission So reprint a technical paper or per­ mission to use copyrighted SAE publications in other works, contact the SAE Publications Division. SAE GLQ8AI MOBILITY DATABASE No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN0148-7191 Copyright © 1988 Society of Automotive Engineers, Inc. Positions and opinions advanced In this paper are those of Persons wishing to submit papers to be considered for the authors} and not necessarily those of SAE. The author presentation or publication through SAE should send the is sotBiy responsible for the content of the paper. A process manuscript or a 300 word abstract of a proposed manua­ ls available by which discussions will be printed with the crlpt to: Secretary, Engineering Activity Board, SAE paper if It is published in SAE Transactions. For permission to publish this paper in fuii or In part, contact the SAE Publications Division. Printed in U.S.A. Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018881674 Eweiuation of Vibration-Preventive Properties ©f Lubricating Oils in Wet Friction Plates and Retention of Such Properties Using a Friction Tester Mamoru Miyazaki and Michio Hoshino Mitsubishi Oil Co., Ltd. ABSTRACT Use of a constant speed friction tester developed to investigate the vibration-preventive properties of oils in wet friction plates afforded better understanding of frictional properties in wet friction. It was found that the dissipation of the friction modifier effect during prolonged use was caused mostly by the change of properties of oils. Test procedures using the tester were validated by testing three automatic transmission fluids with known in-service performance charac­ teristics. Vibrations, caused by the stick-slip between the friction plate and steel plate, were reproduced on the tester by varying its rigidity. The tester is expected to be effective in counter­ ing actual problems. THE PURPOSE OF THIS PATER is to present the results of the evaluation of vibration-preventive properties of lubricating oils in wet friction plates, using a friction tester developed by the authors. In wet clutches and wet brakes, It Is im­ portant to prevent vibration by modifying friction coefficient versus sliding velocity (n vs v) prop­ erties in the com