400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 1999-01-0594 Recent Advancements in Gaskets for Automatic Transmissions Marc L. Friedrich and Yingjie Kong Farnam Meillor Sealing Systems International Congress and Exposition Detroit, Michigan March 1-4, 1999Downloaded from SAE International by University of British Columbia, Monday, August 20, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition,however, that the copier pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc.Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec-tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such ascopying for general distribution, for advertising or promotional purposes, for creating new collective works,or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department.To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wr itten permission of the publisher. ISSN 0148-7191 Copyright 1999 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is published inSAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 3 00 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by University of British Columbia, Monday, August 20, 20181 1999-01-0594 Recent Advancements in Gaskets for Automatic Transmissions Marc L. Friedrich and Yingjie Kong Farnam Meillor Sealing Systems Copyright © 1999 Society of Automotive Engineers, Inc. ABSTRACT Our latest research efforts in the area of internal auto- matic transmission gaskets have focused on techniques to quantify the property of erosion resistance and tech-niques to verify the performance of integral filter gaskets.This paper starts with a discussion of the erosive forcesacting on a typical valve body gasket. Testing techniqueswhich have been used in the past are discussed, alongwith a description of failure modes seen in the field. Newmeasurement techniques - which provide more detailederosion data - are introduced, and the results from testing both current products and new products with these new techniques are presented. Recent applications of inte-gral filter gaskets - which are designed to protect sole-noid bodies from contamination - are discussed, alongwith new testing techniques for evaluating the effects of ATF immersion on filter gaskets. The results from testing several filter medias with these new techniques are pre-sented. INTRODUCTION Along with the ability to conform to surface irregularities,to resist chemical degradation due to heat and exposureto ATF fluids, to minimize creep and extrusion, to main- tain dimensional stability, and many other key perfor- mance criteria, a successful automatic transmissiongasket material must mainta