SAE TECHNICAL PAPER SERIES 2002-01 -2818 The Circulation Type Foaming Test Method of Lubricating Oils to Simulate the Foaming Characteristics of ATF in the Automatic Transmission Akira Mitarai, Toshihiko Ichihashi and Yutaka Takakura Idemitsu Kosan Co., Ltd Reprinted From: Lubricants (SP-1722) Powertrain & Fluid Systems Conference & Exhibition San Diego, California USA October 21-24, 2002 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax:(724) 776-5760 Web: www.sae.org Downloaded from SAE International by American Univ of Beirut, Saturday, July 28, 2018All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth Drive Warrendale, PA 15096-0001-USA Email: [email protected] Fax: 724-772-4891 Tel: 724-772-4028 All SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility Database. For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-1615 Email: [email protected] ISSN 0148-7191 Copyright © 2002 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 in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USA Downloaded from SAE International by American Univ of Beirut, Saturday, July 28, 20182002-01-2818 The Circulation Type Foaming Test Method of Lubricating Oils to Simulate the Foaming Characteristics of ATF in the Automatic Transmission Akira Mitarai, Toshihiko Ichihashi and Yutaka Takakura Idemitsu Kosan Co., Ltd Copyright © 2002 Society of Automotive Engineers, Inc. ABSTRACT ASTM D 892 'Standard Test Method for Foaming Characteristics of Lubricating Oils is commonly used for evaluating the foaming characteristics of lubricating oils. However, the ASTM test method does not always reproduce the same foaming characteristics of ATF in an actual automatic transmission. A new laboratory test method of foaming characteristics of lubricants has been developed to simulate the foaming characteristics of ATF in the automatic transmission, and it has been named " The Circulation Type Foaming Test Method". This test method has a high correlation with the foaming characteristics of ATF in the automatic transmission and sufficient repeatability as a test method. Furthermore, a small quantity of sample, short testing time and automated control are key characteristics. In this paper, the development procedure of this test method and each factor relating to the foaming characteristics is reported, such as sample volume, nozzle diameter and height, and impingement time. INTRODUCTION ASTM D 892 Standard Test Method for Foaming Characteristics of Lubricating Oils has been commonly used for evaluating the foaming characteristics of lubricating oils. However, since this ASTM test method tends to not reproduce the same foaming characteristics of ATF in an automatic transmission (AT), it is not always a suitable test method. In the past, a long endurance bench test or a vehicle test was carried out to evaluate the foaming performance of ATF. During these tests, its foaming performance was verified as adequate. However, a bench test or actual vehicle test are not suitable for the laboratory test method due to its heavy wor