400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2007-01-1098 Toyota’s New Six-Speed Automatic Transmission AB60E for RWD Vehicles Masato Watanabe, Kazumichi Sasaki, Koichi Miyamoto and Masafumi Kinoshita Toyota Motor Corp. Manabu Hasegawa Denso Corp. Akifumi Yamasaki, Atsushi Mori and Hiroyuki Tsukamoto Aisin AW Co., Ltd. Reprinted From: Tr ansmissions & Drivelines (SP-2134) 2007 World Congress Detroit, Michigan April 16-19, 2007 Downloaded from SAE International by Univ of California Berkeley, Monday, July 30, 2018By mandate of the Engin eering Meetings Board, th is paper has been approved for SAE publication upon completion of a peer review process by a minimum of three (3) industry experts under the supervision of the session organizer. All 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 DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-776-3036Tel: 724-772-4028 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: Customer [email protected] ISSN 0148-7191Copyright © 2007 SAE InternationalPositions 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 pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Monday, July 30, 2018Copyright © 2007 SAE International ABSTRACT Toyota Motor Corporation has developed a new six- speed automatic transmission AB60E for longitudinal front engine rear wheel drive (RWD) vehicles. This transmission development was aimed at an improvement of power performance and fuel economy, while achieving a lightweight, compact package and a high torque capacity. In order to achieve this target, a high-capacity ultra-flat torque converter, a highly-rigid transmission case, and an ATF warmer with a valve to switch ATF circuits to an air-cooled ATF cooler have been newly developed. Moreover, a ne w transmission mode control logic “TOW / HAUL” has been developed to improve power performance and driveability during trailer towing. This automatic transmission has adopted the same gear train and hydraulic control system as the conventional six-speed automatic transmission A760E. This paper describes the structure, major features and performance of the transmission in detail. INTRODUCTION In recent years, environmental issues such as increasing carbon dioxide emissions and soaring fuel prices have become the most important on a global scale. Thus, it’s an obligation for automakers to improve fuel efficiency with new technologies, such as a multi-speed automatic transmission while maintaining power performance, driveability, and noise and vibration (NV) characteristics. In the above-described background, a new high-capacity six-speed automatic transmission AB60E for RWD vehicles was developed. Figure 1 shows the engine torque capacity corresponding to the automatic transmissions for Toyota RWD vehicles. This automatic transmission has been developed not only to meet a higher engine torque but also to improve fuel efficiency, and to fulfill performance required in luxury cars and full-siz e trucks used under severe driving conditions. Figure 1. Toyota’s R