400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2006-01-1305 Toyota’s New Belt-drive Continuously Variable Transaxle for 1.3-liter FWD cars Kazumichi Tsukuda, Takao Taniguchi, Ka zumasa Tsukamoto, Shigeo Tsuduki, Masashi Hattori and Kazuo Takemoto Aisin AW Co., Ltd. Ryoji Habuchi Toyota Motor Co.,Ltd Reprinted From: Tran smission and Driveline 2006 (SP-2001) 2006 SAE World Congress Detroit, Michigan April 3-6, 2006 Downloaded from SAE International by Univ of California Berkeley, Wednesday, August 01, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under th e supervision of the session organi zer. This process requires a minimum of three (3) reviews by industry experts. 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]: 724-772-4028 Fax: 724-776-3036 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: [email protected] ISSN 0148-7191 Copyright © 2006 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 th e 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 publicat ion by SAE should send the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Wednesday, August 01, 20181ABSTRACT AISIN AW has developed a new Continuously Variable Transmission (hereafter CVT) with torque converter for small capacity engines. The target vehicles are B class cars. The following items are the concept of thedevelopment. - Compact size to be applicable to small cars in Japan (K-car). - The lightest in the world. - Low noise level in addition to improved fuel consumption.The CVT introduces neutral-control logic and a long-travel damper on the torque converter for expansion of the lock-up area. INTRODUCTION The CVT achieves a good balance between drivability and fuel efficiency, and therefore has been adopted by various carmakers especially in the compact car market. To meet the growing demand for a compact andlightweight CVT, AISIN AW successfully developed a new CVT which is superior in noise level and realizes weight savings and size minimization. This newlydeveloped CVT is based on our knowledge andexperience in automatic transmission development acquired over the years. This paper describes the structure and advantages of the new CVT with a focuson our approach to its low-noise and compact design. DEVELOPMENT OBJECTIVES The design targets were established as detailed below: COMPACTNESS ±Suitable size for Japanese K-car LIGHTWEIGHT ±Best-in-class LOW NOISE ±The same or better than a conventional step A/TFUEL ECONOMY ±Appropriate control logic such as neutral control for excellent fuel economyDRIVEABILITY ±Superior drivability with high fuel efficiency STRUCTURE Specifications and a cross section drawing are shown in Table 1 and Figure 1 respectively. This CVT consists of a torque converter with a long travel damper (hereafter LTD), non-crescent type oil pump, forward-reversechanging mechanism, belt and pulley components, finalgear set, and differential gears. These elements are arranged in a conventional layout but with a compact structure. The