The Engineering Resource For Advancing Mobility 400 COMMONWEALTH DRIVE WARRENDALE, PA 15096 t ■ ! 840782 Development of Automatic TCI IS 49 «£ ^^^% nagEB ransmission for 120 Ton and 160 Ton Dump Truck Takashi Osaka and Masayuki Sato Komatsu Ltd. Earthmoving Industry Conference Peoria, Illinois April 9-11, 1984 Downloaded from SAE International by University of New South Wales, Tuesday, September 18, 2018The appearance of the code at the bottom of the first page of Shis paper indicates SAE's consent that copies of the paper may be made for persona! or interncl use, or for the personal or internal use of specific clients. This consent is given on the con­ dition, however, that the copier pay the stated per article copy fee through the Copyright Clearance Center, Inc., Operations Center, P.O. Box 765, Schenectady, N.Y. 12301, 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. Papers published prior to 1978 may also be copied at a per paper tee of $2.50 under the above stated conditions. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Order Department. To obtain quantity reprint rates, permission to reprint a technical paper or per­ mission to use copyrighted SAE publications in other works, contact the SAE Publications Division. ISSN 0148-7191 Copyright © 1984 Society of Automotive Engineers, Inc. This paper is subject to revision. Statements and opinions ad- Persons wishing to submit papers to be considered for pre- vaneed in papers or discussion are the author's and arc his sentation or publication through SAL should send the manu- responsibllity. not SAL's; however, the paper has been edited script or a 300 word abstract of a proposed manuscript to: by SAL! for uniform styling and format. Discussion will be Secretary, Engineering Activity Hoard, SAL. printed with the paper if it is published in SAL Transactions. lor permission to publish this paper in full or in part, contact Printed in U.S.A. the SAL Publications Division. Downloaded from SAE International by University of New South Wales, Tuesday, September 18, 2018840782 Development of Automatic Transmission for 120 Ton and 160 Ton Dump Truck Takashi Osaka and Masayuki Sato Komatsu Ltd. ABSTRACT As a direct result of the raining industries need to improve efficiency and production in open pit type operations, the size of dump trucks has increased. In addition, the increase in vertical lift and resultant grades, and the in­ crease in hauling distances are making the demand for mechanical drive dump trucks. With these mining requirements, we have developed the me­ chanical automatic transmission, controlled by microprocessor, with 8 forward speeds and 1 re­ verse speed, which suit 120 mton class dump trucks and 160 mton class dump trucks. This paper shows the design concept and progress made in development of these transmissions. 1. DEMAND FOR MECHANICAL DRIVE DUMP TRUCKS (1) Demand in deep pit operations. Fig. 1 Vertical Lifts. (V.L.) The vertical lift is increasing in open pit mining. In general, deep pit mines cover a range of 100 ^BOOm in vertical lift. In these deep pit mines, to reduce the construction costs of truck roads, the grade must be in­ creased. In this case the electric drive systems have an overheating problem. The durability of electric drive systems is greatly affected by temperature. The life of insul­ ating material may be reduced by half with each rise in temperature by 10° c. "h-b 100- 90J an 30 20i 10-1 O-mmuie racing conunuoul r31ing POWE R 10 15 20 25 30 35 MPH 20 30 40 SO Travel Speeci 60 km/h Travel Performance Curve Deep Pit Type Electric Drive Dump Truck 0148-7191/84/040907