400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-1163 Analysis of the Gear Shift Mechanisms by R-R Chart Method Jongsool Park and Jongsun Oh Hyundai Motor Company Reprinted From: Transmission and Driveline Systems Symposium 2001 (SP–1598) SAE 2001 World Congress Detroit, Michigan March 5-8, 2001Downloaded from SAE International by Birmingham City Univ, Sunday, August 19, 2018The appearance of this 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 pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc.Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec-tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such ascopying 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 Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department.To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wr itten permission of the publisher. ISSN 0148-7191 Copyright 2001 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 p ublished in SAE T ransactions. 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 3 00 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by Birmingham City Univ, Sunday, August 19, 20182001-01-1163 Analysis of the Gear Shift Mechanisms by R-R Chart Method Jongsool Park and Jongsun Oh Hyundai Motor Company Copyright © 2001 Society of Automotive Engineers, Inc. ABSTRACT A new point of view in automatic transmission is proposed by R-R chart, which is a new analytic method based on the linearity of planetary gear and gear shift mechanism. The R-R chart is a visual tool to describe the whole motion of each rotational element of planetary gears in relation to the gear shift mechanism. Therefore, anyone can easily find on R-R chart not only thesubstance of the gear shift mechanisms in presentautomatic transmissions but also new gear shiftmechanisms for the future automatic transmissions. This paper shows that the R-R chart is unique in 4-speed automatic transmissions with fixed compound planetary gear sets. As a result of the R-R chart application, this paper classifies the fixed compound planetary gear sets with 4 elements into 12 sets and the gear shift mechanisms into 3 types. Also, 4 R-R characteristicequations are derived as a correlation between speedratios in 4-speed automatic transmissions. This paperdescribes systematically the gear shift mechanisms for5- and 6-speed automatic transmission by R-R chart. Finally, this paper introduces the new gear shift mechanism for 5-speed automatic transmission with 3 clutches and 1 brake. INTRODUCTION Planetary gear sets have been used as common gear shift units in automatic tr