400 COMMONWEALTH DRIVE WARRENDALE, PA 15096 *.-//'/ 7 / i / \_ %--. oro«^ ^ >^f%?J?2 g^^W Bernard R. Baranski Schwitzer Cooling Systems Household International Earthmoving Industry Conference Peoria, Illinois April 9-11, 1984 Downloaded from SAE International by Imperial College London, Sunday, September 23, 2018The appearance of the code at the bottom of the first page of this paper indicates SAE's consent that copies of the paper may be made for personal or internci 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 genera? 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 fee 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. BSN 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- vanced in papers or discussion are the author's and arc his scntation or publication through SAE should send the mams- responsibUity, not SAE's; however, the paper has been edited script or a 300 word abstract of a proposed manuscript to: by SAE for uniform styling and format. Discussion will be Secretary, Engineering Activity Board, SAE. printed with the paper if it is published in SAE Transactions. 1'or permission to publish this paper in full or in part, contact Printed in U.S.A. the SAE Publications Division. Downloaded from SAE International by Imperial College London, Sunday, September 23, 2018840789 ABSTRACT Molded blades on stamped steel spiders meet today's demand for low inertia, light weight* and lower cost cooling fans for construction and other heavy duty applications. Hybrid construction also permits use of wider blades for increased efficiency. Finite element modeling and extensive laboratory testing assure predictable durability. MOLDED NON-METALLIC FANS have enjoyed continuing success in the the highway truck market because of their light weight, low inertia, and low cost. These fans are clockwise rotation sucker fans fitted to both viscous and on-off air clutches. The relatively high production volume of these fans justify the high initial tooling costs. The one-piece molded fans find limited application in the heavy duty market. They are currently tooled primarily for sucker applications and cannot be molded economically in diameters greater than 800 mm. The hybrid fan extends the molded concept to the construction and other heavy duty markets with lower initial costs and much increased design flexibility over one-piece molded fans. Both sucker and blower designs are available from a single blade mold which is capable of producing blades of various lengths. The use of existing spider tooling further reduces tooling expenditures. This paper will examine the construction of the hybrid fan, explore its applications in the construction equipment industry, compare the hybrid fan to the conventional metal fan, and discuss testing and structural qualification. HYBRID FAN CONSTRUCTION A hybrid fan consists of individually Hybrid Fans for Construction Equipment Bernard R. Baranski Schwitzer Cooling Systems Household International