400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org 2005-01-0272 Development of a New Hybrid Transmission for FWD Sports Utility Vehicles Hiroshi Hata, Masahiro Kojima, Hide to Watanabe, Tatsuhiko Mizutani, Munehiro Kamiya, Eiji Yanagida and Keiji Takizawa Toyota Motor Corp. Reprinted From: Advanced Hybrid Vehicle Powertrains 2005 (SP-1973) 2005 SAE World Congress Detroit, Michigan April 11-14, 2005 SAE TECHNICAL PAPER SERIESDownloaded from SAE International by University of Minnesota, Thursday, August 02, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE’s peer review process under the supervision of the session organizer. 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]: 724-772-4028Fax: 724-772-4891 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: Customer [email protected] ISSN 0148-7191Copyright © 2005 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 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 to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by University of Minnesota, Thursday, August 02, 20182005-01-0272 Development of a New Hybrid Transmission for FWD Sports Utility Vehicles Hiroshi Hata, Masahiro Kojima, Hideto Watanabe, Tatsuhiko Mizutani, Munehiro Kamiya, Eiji Yanagida and Keiji Takizawa Toyota Motor Corp. Copyright © 2005 SAE International 1 ABSTRACT A new hybrid transmission (P310) has been developed for FWD 3-liter engine class sports utility vehicles. The development of this transmission has been aimed at improving power performance and fuel economy, achieving the world's top-level weight reduction and compact size, while maintaining high torque capacity. In order to achieve these goals, the gear train and motor have been newly designed, and advanced technology has been applied. Moreover, this hy brid transmission achieves seamless acceleration and quiet performance. This paper describes the major features and performance of this transmission in detail. 2 INTRODUCTION Environmental and energy efforts, such as reducing the volume of CO 2 emissions and improving the fuel consumption of automobiles, are important activities for the world. Under these circum stances, a hybrid vehicle is able to achieve both high acceleration performance and fuel economy. In 1997, the first Prius was introduced and recognized as the epoch-making Eco friendly vehicle. In 2003, the new Prius proposed a new hybrid drive concept or Hybrid Synergy Drive, which has better fun-to-drive features as well as environmental performance. This year, we have developed a new hybrid transmission for FWD 3-liter engine class sports utility vehicles. This hybrid transmission has been developed to perform under the severe conditions required in a SUV, while maintaining the refinement deserving of a luxury vehicle. 3 DEVELOPMENT OBJECTIVES The development objectives of this hybrid transmission are as follows: (1) Compact size (2) Improved po