SAE TECHNICAL PAPER SERIES Development of New Aisin Transmission for Medium Duty Truck and Bus Yoshinobu Iwase, Hiromi Hasegawa, Yoshiyuki Onimaru, Shinji Takemura, and Toshiaki lshiguro Aisin Seiki Co., Ltd. The Engineering Society =For Advancing Mobility and Sea Air and Space, International Truck & Bus Meeting & Exposition Seattle, Washington November 7-9,1994 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (41 2)776-4841 Fax:(412)776-5760 Downloaded from SAE International by Imperial College London, Thursday, August 09, 2018The appearance of the ISSN code at the bottom of this page indicates SAE's consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier paya$6.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01 923forcopying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Service Department. To obtain quantity reprint rates, permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group at (41 2) 776-4841. GLOBAL MOBlUTY DATME A11 SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility Database. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 0148-7191 Copyright 1994 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. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Activity Board, SAE. Printed in USA 90-1203cm Downloaded from SAE International by Imperial College London, Thursday, August 09, 2018Development of New Aisin Transmission for Medium Duty Truck and Bus Yoshinobu Iwase, Hiromi Hasegawa, Yoshiyuki Onimaru, Shinji Takemura, and Toshiaki lshiguro Aisin Seiki Co., Ltd. ABSTRACT AISIN SEW CO., Ltd. Started the production of elec- tronically controlled hydraulic automatic transmissions for me- dium-duty trucks and buses in 1989. The number of vehicles on the Japanese market in which this system is adopted is increas- ing steadily. After reexamining market needs, AISIN SEW CO., Ltd. has newly developed an electronically controlled hy- draulic automatic transmission A580 which focuses on im- proved input capacity, driving performance and fuel economy for medium-duty trucks and buses and lessens learnt hm ex- perience. FOREWORD This paper describes the features and specifications of the electronically controlled hydraulic automatic transmission A580 that AISIN SEW Co., Ltd. has newly developed for me- dium-duty trucks and buses. First, we will describe the product fiom the perspective of its application range and principal engi- neering specifications. Then, we will discuss the suuceural characteristics of this automatic transmission by component, as well as the functions offered by the various performance im- provement technologies incorporated into the product, and how they were achieved. In addition, we