1、 SURFACE VEHICLE RECOMMENDED PRACTICE J1671 FEB2015 Issued 1997-06 Revised 2015-02 Superseding J1671 MAY2006 Outboard Mounted Brake Drum/Disc Wheel Hub Interface Dimensions - Truck and Bus RATIONALE This document is currently under a five year review. The object of this document is to establish dime
2、nsional standardization within the interference areas of outboard mounted brake drums and hubs for disc wheels. Inch dimension tables have been added to this document where metric mounting system tables are referenced. In Tables 1 and 3 a maximum “E” dimension has been added. All other design parame
3、ters remain unchanged except for conversion to English dimensions and rounding. Figures 1 and 3 have been revised to show the wheel backup diameter “G” as a reference dimension per SAE J694. Other changes were general formatting. 1. SCOPE This recommended practice contains dimensions and tolerances
4、for outboard mounted brake drums and disc wheel hubs in the interface areas. This recommended practice is intended for outboard mounted brake drums and disc wheel hubs commonly used on class 7 and 8 commercial vehicles. Included are SAE J694 mounting systems II, III, IV, XIV, and X. Special and less
5、 common applications are not covered. 1.1 Purpose This recommended practice defines and documents the dimensions and tolerances necessary to maintain interchangeability in the interface areas. Components of different mounting systems with common bolt patterns could be mixed together and cause servic
6、e problems. Therefore, it is important to note that each mounting system should be treated individually and their components not be intermixed. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicat
7、ed, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J694 Disc Wheel/Hub or Drum Interface Dimensions
8、- Truck and Bus _ 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 infringeme
9、nt arising therefrom, is the sole responsibility of the user.” 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 2015 SAE International All rights reserved. N
10、o part of this publication 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
11、: +1 724-776-4970 (outside USA) Fax: 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/J1671_201502 SAE INTERNATIONAL J1671 Revised FEB2015 Page 2 of 6
12、2.2 Related Publication The following publications are provided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada)
13、 or 724-776-4970 (outside USA), www.sae.org. SAE J393 Nomenclature - Wheels, Hubs and Rims for Commercial Vehicles 3. DEFINITIONS A listing of basic nomenclature and definitions are shown below. Metric mounting systems shown in Figures 1 and 2 are given in millimeters (mm). Inch mounting systems sho
14、wn in Figures 3 and 4 are given in inches. 3.1 FEATURE DEFINITION A Drum Center Hole Diameter B Inside Drum Face Diameter (Flat) C Inside Clearance Diameter D Wheel Bolt or Stud Hole Diameter E Drum Center Hole Chamfer F Drum Thickness G Wheel Backup Diameter (for reference only SAE J694) H Drum Pil
15、ot Diameter of Hub J Hub Flange Face Diameter (Flat) K Hub Flange Outside Diameter L Drum Pilot Length on Hub M Drum Seat Length on Hub N Hub/Drum Pilot Fillet Radius on Hub 4. MOUNTING SYSTEM The combination of hub/drum interface characteristics that identify uniqueness. These characteristics are:
16、number of bolt holes, bolt circle diameter, and fastener type/size. Unique mounting systems are defined by the Roman numerals in applicable tables throughout the document. Within a given mounting system, the brake drums are interchangeable only by use of the appropriate hubs with appropriate dimensi
17、ons. 5. SCALLOPED HUBS In an attempt to reduce wheel end package weight, some hub manufacturers have adopted the practice of creating scallops in the mounting flange of the hub. The term “scallop” refers to the removal of material from the drum backup diameter that results in an interrupted support
18、face. In some applications, the use of scalloped hubs has led to the development of cyclical fatigue cracks in disc wheels. It is recommended that scalloped hubs not be used when the disc wheel is mounted directly to the mounting face of the hub. Use of scalloped hubs with outboard mounted brake dru
19、ms is generally deemed acceptable. Wheel manufacturers should be consulted for each particular application. 6. NOTES 6.1 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
20、to the 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. SAE INTERNATIONAL J16
21、71 Revised FEB2015 Page 3 of 6 FIGURE 1 TABLE 1A (FIGURE 1) - DRUM INTERFACE DIMENSIONS ALL DIMENSIONS IN MILLIMETERS TABLE 1B (FIGURE 1) DRUM INTERFACE DIMENSIONS ALL DIMENSIONS ARE IN INCHES MOUNTING SYSTEMS BRAKE DRUM DIMENSIONS( Metric - Hub Piloted) A B C D E FMountingBolt No. of Stud or Drum M
22、inimum Minimum Min. Drum Drum Center MinimumSystemCircle Studs or Bolt Center Inside Drum Inside Bolt or Stud Hole Drum(SAE J694)Diameter Bolts Diameter Hole Face Clearance Hole Chamfer ThicknessDiameter Diameter Diameter Diameter II 275 8 20 228.62 319.8 324.4 21.5 2.30 6.1228.52 3.56III 285.75 10
23、22 223.08 330.5 336 23.5 2.30 6.1222.98 3.56IV 335 10 22 285.85 369.3 375.9 23.5 2.30 6.1285.75 3.56XIV 275 8 20 228.62 330.5 336 23.5 2.30 6.1228.52 3.56MOUNTING SYSTEMS BRAKE DRUM DIMENSIONS( Metric - Hub Piloted) A B C D E FMountingBolt No. of Stud or Drum Minimum Minimum Min. Drum Drum Center Mi
24、nimumSystemCircle Studs or Bolt Center Inside Drum Inside Bolt or Stud Hole Drum(SAE J694)Diameter Bolts Diameter Hole Face Clearance Hole Chamfer ThicknessDiameter Diameter Diameter Diameter II 10.827 8 0.787 9.001 12.591 12.772 0.846 0.090 0.2408.997 0.140III 11.25 10 0.866 8.783 13.012 13.228 0.9
25、25 0.090 0.2408.779 0.140IV 13.189 10 0.866 11.254 14.539 14.799 0.925 0.090 0.24011.250 0.140XIV 10.827 8 0.787 9.001 13.012 13.228 0.925 0.090 0.2408.997 0.140SAE INTERNATIONAL J1671 Revised FEB2015 Page 4 of 6 FIGURE 2 TABLE 2A (FIGURE 2) - HUB INTERFACE DIMENSIONS ALL DIMENSIONS IN MILLIMETERS T
26、ABLE 2B (FIGURE 2) HUB INTERFACE DIMENSIONS ALL DIMENSIONS ARE IN INCHES MOUNTING SYSTEMS HUB DIMENSIONS( Metric - Hub Piloted) H J K L M NMountingBolt No. of Stud or Drum Maximum Maximum Minimum Maximum MaximumSystemCircle Studs or Bolt Pilot Flange HUB Drum Drum Drum Pilot(SAE J694)Diameter Bolts
27、Diameter Diameter Face Flange Pilot Seat FilletDiameter Diameter Length Length RadiusII 275 8 20 228.49 319 324 4.1 6.1 2.3228.39III 285.75 10 22 222.96 330 334 4.1 6.1 2.3222.86IV 335 10 22 285.73 368 373.9 4.1 6.1 2.3285.63XIV 275 8 20 228.49 330 334 4.1 6.1 2.3228.39MOUNTING SYSTEMS HUB DIMENSION
28、S( Metric - Hub Piloted) H J K L M NMountingBolt No. of Stud or Drum Maximum Maximum Minimum Maximum MaximumSystemCircle Studs or Bolt Pilot Flange HUB Drum Drum Drum Pilot(SAE J694)Diameter Bolts Diameter Diameter Face Flange Pilot Seat FilletDiameter Diameter Length Length RadiusII 10.827 8 0.787
29、8.996 12.559 12.756 0.161 0.240 0.0908.992III 11.25 10 0.866 8.778 12.992 13.150 0.161 0.240 0.0908.774IV 13.189 10 0.866 11.249 14.488 14.720 0.161 0.240 0.09011.245XIV 10.827 8 0.787 8.996 12.992 13.150 0.161 0.240 0.0908.992SAE INTERNATIONAL J1671 Revised FEB2015 Page 5 of 6 FIGURE 3 TABLE 3 (FIG
30、URE 3) - DRUM INTERFACE DIMENSIONS ALL DIMENSIONS IN INCHES MOUNTING SYSTEMS BRAKE DRUM DIMENSIONS( Inch - Ball Seat) A B C D E FMountingBolt No. of Stud or Drum Minimum Minimum Min. Drum Drum Center MinimumSystemCircle Studs or Bolt Center Inside Drum Inside Bolt or Stud Hole Drum(SAE J694)Diameter
31、 Bolts Diameter Hole Face Clearance Hole Chamfer ThicknessDiameter Diameter Diameter Diameter X 11.250 10 0.750 8.783 13.010 13.228 0.920 0.090 0.2408.779 0.140X 11.250 10 1.125 8.783 13.010 13.228 1.240 0.090 0.2408.779 0.140SAE INTERNATIONAL J1671 Revised FEB2015 Page 6 of 6 FIGURE 4 TABLE 4 (FIGU
32、RE 4) - HUB INTERFACE DIMENSIONS ALL DIMENSIONS IN INCHES PREPARED BY THE SAE TRUCK AND BUS WHEEL COMMITTEE OF THE SAE TRUCK AND BUS BRAKE AND STABILITY CONTROL STEERING COMMITTEE MOUNTING SYSTEMS HUB DIMENSIONS( Inch - Ball Seat) H J K L M NMountingBolt No. of Stud or Drum Maximum Maximum Minimum M
33、aximum MaximumSystemCircle Studs or Bolt Pilot Flange Hub Drum Drum Drum Pilot(SAE J694)Diameter Bolts Diameter Diameter Face Flange Pilot Seat FilletDiameter Diameter Length Length RadiusX 11.250 10 0.750 8.778 12.992 13.150 0.161 0.240 0.0908.774X 11.250 10 1.125 8.778 12.992 13.150 0.161 0.240 0.0908.774
