400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-0874 Performance Investigations of a Novel Rolling Traction CVT S. Akehurst, C. J. Brace and N. D. Vaughan University of Bath Peter Milner Peter J Milner Consultant Engineers Yukiharu Hosoi Yamaha Motor Europe SAE 2001 World Congress Detroit, Michigan March 5-8, 2001Downloaded from SAE International by Big Ten Academic Alliance, Tuesday, July 31, 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 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 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 written 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 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 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 Big Ten Academic Alliance, Tuesday, July 31, 20182001-01-0874 Performance Investigations of a Novel Rolling Traction CVT S. Akehurst, C. J. Brace and N. D. Vaughan University of Bath Peter Milner Peter J Milner Consultant Engineers Yukiharu Hosoi Yamaha Motor Europe Copyright © 2001 Society of Automotive Engineers, Inc. ABSTRACT The Milner CVT is a patented [1] rolling traction transmission offering advantages of high power density and simplicity of construction and operation. A 90 mm diameter prototype variator is described which was sized for a maximum rated input power of 12 kW.Experimental data are presented demonstrating high efficiency and low shift forces. Resistance to overload torque is shown to be exceptional and preliminarydurability trials indicate a highly viable concept for series production. Based upon the measured data, characteristics of larger variators are predicted and prospects for automotive applications discussed. INTRODUCTION CVTs of various forms have been developed over many years [2], but it is only in the last two decades with the constraints of emissions and fuel consumption, being thrust upon automotive engineers, that their use is beingseriously considered. There are many different variants of CVT from rolling traction drives [3] to variable sheave V-belt drives [4] and split power, hydraulic motor/pump variator arrangements for use in high poweredmachinery [5]. The Milner CVT (MCVT) is a new concept CVT that fits into the r