SAE TECHNICAL PAPER SERIES New Transmission Gear Train for Bulldozers M. Sato, T. Kuse, M. Nakamura, and T. Hisamura Komatsu Ltd. LIBRARY The Engineering Society ** =For Advancing Mobility and sea ~ir and space, International Off-Highway & Powerplant Congress and Exposition Milwaukee, Wisconsin September 9-1 2,1991 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. Downloaded from SAE International by University of Michigan, Tuesday, September 18, 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. Thisconsent is given on thecondition, however, thatthe copier pay a$5.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 27 Congress St., Salem, MA 01 970 for copying 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. All SAEpapers. standards and selected books are abstracted and fndexed In the SAE Global Mobrl~fy Database part of this publication may by reproduced in any form, irl an electronic retrieval stem or otherwise, without the prior written permission of the publisher. opyright 1991 Soclety 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 Division. 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 Downloaded from SAE International by University of Michigan, Tuesday, September 18, 2018New Transmission Gear Train for Bulldozers M. Sato, T. Kuse, M. Nakamura, and T. Hisamura Kornatsu Ltd. ABSTRACT A higher versatility is required from medium size bulldozers as vehicles other than large size bulldozers. Therefore thedesign concept of the transmission for medium size bulldozers has to be changed to that of large size bulldozers. We adopted combination of high capacity torque convertor and low reduction (high output speed) cross ratlo gear train for medium size. bulldozers' transmission. We also evaluated the advantages and disadvantages of rotating clutches, and decided not to use the rotating clutches in new transmission for medium size bulldozers, because of their disad- vantages. By these design concepts and material technology, we can reduce the transmission size and improve the efficiency. 1. Introduction We have recently developed a gear train for application in medi- um size bulldozers (135-240Kw), which reduces the weight by 20-30% compared with previous transmission model. This paper outlines our design concept of this deveiopmenc project. 2. Characteristics Required for Transmission Used in Medium size Bulldozers A higher versatility is required from medium size bulldozers (135-240 Kw) as vehicle. As an example, Fig.1 shows the working conditions of the 135Kw-class are mainly used for dozing, side cutting and ripping as well as for grading and logging. Since frequent movements between job sites are required, easy transportation by trailer is