ISO/TR TECHNICAL REPORT 14179-1 Firstedition 2001-##-## Gears - Part 1: Thermal rating Engrenages- Partie1:Capacitethermique PROOF/EPREUVE Referencenumber ISO/TR 14179-1:2001(E) ISo UUGUSIO CopyrightInternational Organizationfor Standardization ISO/TR14179-1:2001(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file,parties accept therein the responsibility of not infringing Adobe's licensing policy.The iso Central Secretariat accepts no liability in this area. Adobe isatrademarkofAdobeSystems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO2001 Allrights reserved. Uniess otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either Iso at the address below or Iso's member body inthecountryoftherequester. ISO copyright office Casepostale56-CH-1211Geneva20 Tel.+4122 749 01 11 Fax +4122749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland PROOF/EPREUVE @Is0 2001-All rights reserved ISO/TR 14179-1:2001(E) Contents Page Foreword. iv Introductio Scope 2 Symbols and units 3 Principle. 3.1 General. 3.2 Rating criteria Service conditions. 4.1 Intermittent service.. 4.2 Adverseconditions 4.3 Favourable conditions 4.4 Auxiliary cooling.. 5 Methods for determining the thermal rating ... 6 Method A . Test ... 7 MethodB Calculationsfordeterminingthethermal powerrating,Pr 7.1 General.. 7.2 Heat generation 7.3 Bearingpowerloss,P.... 7.4 Meshpowerloss,Pm,spurandhelical gears. 7.5 Meshpowerloss,Pm,bevelgears 7.6 Mesh power loss, PM, cylindrical worm gears.. 7.7 Mesh power loss, Pm, double enveioping worm gears.... 7.8 Oilsealpowerloss,P 7.9 Gear windage and churning power loss, Pw 7.10 Bearing windage and churning power loss,PwB 7.11 Oil pumppowerloss,Pp..... 7.12 Heatdissipation,Po 20 8 Modifications for non-standard operating conditions. AnnexA(informative)Bevelgearmeshandgearwindagepowerlosses.. 24 AnnexB(informative)Wormgearmeshpowerlosses Bibliography 30 Iso2001-Allrightsreserved PROOF/EPREUVE Copvright International Organization for Standardization