1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVpublished 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 therefrom, is the
2、 sole responVLELOLWRIWKHXVHU SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be
3、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: +1 724-776-4970 (outside USA) Fa
4、x: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J635_201403 SURFACE VEHICLE RECOMMENDED PRACTICE J635 MAR2014 Issued 1951-01 Revised 2014-03 Supers
5、eding J635 NOV2008 Fan Hub Bolt Circles and Pilot Holes RATIONALE This document has been reviewed and amended by adding a table of existing common English-unit mounting patterns (legacy patterns) which still dominate in practice. 1. SCOPE This Recommended Practice applies to engine cooling fans up t
6、o 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 for engine co
7、oling fans. A secondary purpose is to encourage adoption of SI metric units, although a listing of existing common English unit mounting patterns (legacy patterns) is provided. It is specifically not the objective of the specification to address the soft metric conversion of existing mounting patter
8、ns on engines designed in English units. Adherence to this specification should result in cost 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 b
9、lade geometry and construction, but with different mounting patterns. 2. REFERENCES There are 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
10、 center sections of fans with small pilots and bolt circle diameters are prone to fatigue-related 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. SAE INTERNATIONAL J635 Revi
11、sed MAR2014 Page 2 of 5 3.2 Clutch Drive Mounting Patterns 3.2.1 Clutch-mounted fans typically have larger pilot diameters and bolt circles than 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
12、 fan diameter, and therefore the correlation between fan size and pilot/bolt circle size listed in Table 1 does not apply. 3.2.2 Table 2 lists recommended pilot and bolt circle diameters (refer also to Figure 1). 3.2.3 Fan mounting patterns for clutches may depart from the common configuration of a
13、circular pilot with outboard mounting bolt holes in order to achieve desired clutch-fan synergy; such features are not covered by this document. 3.3 Tolerances The following guidelines should be considered in determining tolerance specifications for part drawings of the fan and hub as shown in Figur
14、e 1. 3.3.1 The different pilot tolerances shown for fan and hub guarantee that the fan will fit upon the hub, and will help minimize imbalance of the resulting assembly, since the parts are typically balanced separately and not as an assembly. 3.3.2 The bolt circle should be concentric to the pilot.
15、 3.3.3 Positioning of the bolt circle holes should guarantee a match-up between the fan and hub holes. 3.3.4 Fan pilots are typically punched, not machined, and therefore may not be perfectly round. This often necessitates the use of a go-no/go gauge to predict proper fitting on a hub pilot rather t
16、han ordinary diameter-measuring WHFKQLTXHV,WLVUHFRPPHQGHGWKDWWKHWHUPHIIHFWLYHIDQSLORWGLDPHWHUEHXVHGLQSODFHRIDVLPSOHGiameter specification. 3.4 Legacy Mounting Patterns (Common English Unit Patterns) 3.4.1 Tables 3 and 4 list common existing mounting patterns found in use on engine cooling fans. No a
17、ttempt has been made to correlate these patterns with fan diameters as done with the metric patterns in section 3.1. These patterns are found on both fixed-drive and clutch-mounted applications as indicated. Further, bolt hole sizes are not specified because current applications often find the same
18、mounting pattern using various bolt sizes (e.g., 5/16-inch, 3/8-inch, 1/2-inch, M8, M10, M12 bolts). 4. NOTES 4.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the
19、previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE COOLING
20、SYSTEMS STANDARDS COMMITTEE SAE INTERNATIONAL J635 Revised MAR2014 Page 3 of 5 FIGURE 1 - FIXED DRIVE MOUNTING PATTERNS TABLE 1 - FIXED DRIVE MOUNTING PATTERNS (mm) Fan Diameter A Bolt Circle Diameter B Number Bolts C Bolt Hole Diameter D Fan Pilot Hole Dia E Hub Pilot Diameter F Bolt Diameter Thru
21、600 50 4 8.75 25 24.95 8 75 4 8.75 25 24.95 8 100 6 11.00 25 24.95 10 Over 600 Thru 1000 75 4 8.75 50 49.95 8 100 6 11.00 50 49.95 10 125 6 11.00 50 49.95 10 150 6 13.00 50 49.95 12 Over 1000 Thru 1600 100 6 11.00 75 74.95 10 125 6 11.00 75 74.95 10 150 6 13.00 75 74.95 12 200 8 13.00 75 74.95 12 Ov
22、er 1600 Thru 2000 125 6 11.00 100 99.95 10150 6 13.00 100 99.95 12 200 8 13.00 100 99.95 12250 8 13.00 100 99.95 12 SAE INTERNATIONAL J635 Revised MAR2014 Page 4 of 5 TABLE 2 - CLUTCH MOUNTING PATTERNS (mm) A Bolt Circle Diameter B Number Bolts C Bolt Hole Diameter D Fan Pilot Hole Dia E Hub Pilot D
23、iameter F Bolt Diameter 100 4 8.75 75 74.95 8 125 4 8.75 100 99.95 8 150 6 8.75 125 124.95 8 175 6 8.75 150 149.95 8 200 6 11.00 175 174.95 10 225 6 11.00 200 199.95 10TABLE 3 - LEGACY FAN MOUNTING PATTERNS, FIXED-DRIVE AND NON-VISCOUS CLUTCHES A Bolt Circle Diameter B Number Bolts D Fan Pilot Hole
24、Diameter inches ea Inches 1.75 4 0.625 1.968 4 1.001 2.362 4 1.001 2.5 4 1.500 2.88 4 1.500 2.5 4 1.614 3 4 1.751 3.5 6 2.001 3.88 6 2.053 4.5 6 2.501 3.5 6 2.562 5.5 6 3.001 5.75 8 3.001 5.5 6 4.125 6.5 8 4.125 5.5 6 4.501 5.709 8 4.921 9.842 8 4.921 SAE INTERNATIONAL J635 Revised MAR2014 Page 5 of 5 TABLE 4 - LEGACY FAN MOUNTING PATTERNS, VISCOUS CLUTCHES A Bolt Circle Diameter B Number Bolts D Fan Pilot Hole Diameter inches ea Inches 3.25 4 2.521 3.25 4 2.6253.81 4 3.251 4.875 4 4.375 6 6 4.9216 6 5.001 5.787 3 5.315 8.437 6 7.001 7.874 6 7.087
