400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.orgSAE TECHNICAL PAPER SERIES 2004-01-0650 Toyota’s New Six-Speed Automatic Transmission A761E for RWD Vehicles Yoshinobu Nozaki, Yoshikazu Tanaka and Hideo Tomomatsu Toyota Motor Corp. Hiroyuki Tsukamoto and Futomi Hanji Aisin AW Co., Ltd. Reprinted From: Transmissi on & Driveline Symposium 2004 (SP-1817) 2004 SAE World Congress Detroit, Michigan March 8-11, 2004Downloaded from SAE International by University of British Columbia, Sunday, July 29, 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 DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4891Tel: 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: 724-776-1615Email: [email protected] ISBN 0-7680-1319-4Copyright © 2004 SAE International 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 discussionswill be printed with the paper if it is published in SAE Transactions. Persons wishing to submit papers to be considered fo r 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 USADownloaded from SAE International by University of British Columbia, Sunday, July 29, 20182004-01-0650 Toyota’s New Six-Speed Automatic Transmission A761E for RWD Vehicles Yoshinobu Nozaki, Yoshikazu Tanaka and Hideo Tomomatsu Toyota Motor Corp. Hiroyuki Tsukamoto and Futomi Hanji Aisin AW Co., Ltd. Copyright © 2004 SAE International ABSTRACT Toyota Motor Corporation has recently developed a new six-speed automatic transmission (A761E) for Front Engine Rear Wheel Drive (FR) vehicles. Following the general trend of increased shift stages and a wider range of gear ratios, this six-speed automatic transmission has been developed with attention paid to the gear steps and a wider range of gear ratios. By balanced selection of close-ratio gears in a wider range, the change greatly improves the power performance and fuel economy of the vehicle. To further improve fuel economy we have adopted new technologies such as low-viscosity ATF , neutral control, and deceleration control by extending the fuel cut range (reset speed). We have also adopted a flat-shaped torque converter, small solenoids, an aluminum oil pump cover, etc. to realize the lightest six-speed automatic transmission in the world. This automatic transmission is low cost due to the adoption of the same gear train as the previously developed five-speed automatic transmission (A750E). This paper describes the structure, features, and performance of this newly developed automatic transmission. INTRODUCTION At the start of the 21st century, vehicle manufacturers have pursued growing environmental improvements such as reduced CO 2 emissions and increased fuel economy. To satisfy these goals, vehicle manufacturers have steadily developed fuel saving technologies such as multi-speed and continuously variable transmissions. With such a background, we have developed the new six-speed automatic transmission for FR vehicles. The new automatic transmission not only satisfies social requirements by adopting new fuel-saving technologies but also realizes excellent drivability and quietness desirable in luxurious passenger vehicles. DEVELOPMENT OBJECTIVES The development objectives of this automatic transmission are as foll