SAE-J635-2008.pdf
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1、_ SAE Technical Standards Board Rules provide that: “ This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2008 SAE International All rights reserved. No part of this publication
3、may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA
4、) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J635 NOV2008 SURFACE VEHICLE RECOMMENDED PRACTICE Issued1951-01 Revised 2008-11 Superseding J635 JUN1995 (R) Fan Hub Bolt Circles and Pilot Holes RATIONALE This document has been reformatted and amended to add flexi
5、bility in its recommendations. Additional bolt circle options have been added to the original four mounting pattern specifications, and tolerancing guidelines have replaced the original true positioning specifications to allow other methods. 1. SCOPE This Recommended Practice applies to engine cooli
6、ng fans up to 2000 mm in diameter with a mounting interface consisting of a pilot hole and a circular bolt pattern. Most of these fans are belt, gear, clutch, hydraulically, or electrically driven. 1.1 Purpose The purpose of this SAE document is to encourage the standardization of mounting patterns
7、for engine cooling fans as new engines are designed and developed in SI metric units. It is specifically not the objective of the specification to address the soft metric conversion of existing mounting patterns on engines designed in English units. Adherence to this specification should result in c
8、ost savings through reduction of part numbers and inventory, and more robust fan design. Failure to comply with this specification will result in the need to release and carry in inventory parts of identical blade geometry and construction, but with different mounting patterns. 2. REFERENCES There a
9、re no referenced publications specified herein. 3. APPLICATION 3.1 Fixed Drive Mounting Patterns Table 1 lists several bolt circle patterns for each pilot (refer to Figure 1 for definitions). Since large, flat center sections of fans with small pilots and bolt circle diameters are prone to fatigue-r
10、elated failures from first-mode flexure, it is recommended that the largest diameter bolt circle be chosen, consistent with available space or hub size, to ameliorate such problems. 3.2 Clutch Drive Mounting Patterns 3.2.1 Clutch-mounted fans typically have larger pilot diameters and bolt circles th
11、an fixed drive mounted fans. The choice of pilots and bolt circles for clutch-mounted fans is often more dependent upon clutch design considerations than upon fan diameter, and therefore the correlation between fan size and pilot/BC size listed in Table 1 does not apply. Copyright SAE International
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