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 theref
2、rom, 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 2012 SAE International All rights reserved. No part of this pub
3、lication 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: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2696_201205SURFACEVEHICLERECOMMENDEDPRACTICEJ2696 MAY2012 Issued 2012-05Inboard Mou
5、nted Disc Brake Rotor/Disc Wheel Hub Interface Dimensions - Commercial Vehicles RATIONALEThis document was developed to help the commercial vehicle market standardize the hub and rotor interface dimensions for class 5, 6, 7, and 8 vehicles equipped with disc brakes. 1. SCOPE This SAE Recommended Pra
6、ctice establishes dimensions and tolerances for the interface between inboard mounted disc brake rotors and disc wheel hubs. The geometric features described in this document are shown at true position. This document is intended for inboard mounted disc brake rotors and disc wheel hubs for Class 5,
7、6, 7, and 8 commercial vehicles. Special and less common applications are not covered. 1.1 Purpose This document defines and documents the dimensions and tolerances necessary to maintain interchangeability in the interface of disc brake rotors and hubs. It is intended to provide direction for future
8、 designs and aid in industry standardization.This document uses the practice of defining hub and rotor mounting systems. Components of different mounting systems, but with common bolt patterns could be mis-assembled and cause service problems. Therefore, it is important to note that each mounting sy
9、stem should be treated individually and their components not be intermixed. It should also be noted that images shown are typical of the various hub and rotor systems. However, other variants may exist. 2. REFERENCES 2.1 Applicable Documents 2.1.1 SAE Publication Available from SAE International, 40
10、0 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J393 Nomenclature - Wheels, Hubs and Rims for Commercial Vehicles SAE J694 Disc Wheel/Hub or Drum Interface Dimensions - Truck and Bus SAE J1671 Outboard Mounted
11、Brake Drum/Disc Wheel Hub Interface Dimensions - Truck and Bus SAE J2696 Issued MAY2012 Page 2 of 11 3. DEFINITIONS A listing of basic nomenclature and definitions are shown in paragraph 3.1. Metric mounting systems are defined using millimeters (mm). Non-metric mounting systems are defined using in
12、ches. The mounting systems defined in this document do not correspond to the mounting systems defined in SAE document J694.3.1 FEATURE DEFINITIONS A Number of Studs or Bolts B Mounting Bolt Circle C Rotor Pilot Hole Diameter D Rotor Mounting Thru Hole Size or Thread E Rotor Minimum Chamfer F Rotor C
13、hamfer Angle G Rotor Minimum Pilot Length H Rotor Maximum Pilot Radius J Hub Pilot Diameter K Hub Mounting Thru Hole Size or Thread L Hub Maximum Pilot Root Radius M Hub Pilot Length N Hub Mounting Counter Bore Diameter P Hub Mounting Counter Bore Depth Q Hub Mounting Pilot Chamfer Angle R Hub Mount
14、ing Pilot Chamfer Length SAE J2696 Issued MAY2012 Page 3 of 11 U Section Rotor Hat Rotor Flat Rotor FIGURE 1 - ROTOR CONFIGURATIONS U section rotors are identified by their distinct cross section. Both the axial inboard and outboard end of the rotor have larger outer diameters than the center sectio
15、n. Hat section rotors are identified by the location of their attachment interface surfaces. One or both of the mounting faces and the face which comes in contact with the fastening mechanism are axially located outside the braking surfaces. The entire mounting flange has a maximum diameter which is
16、 smaller than the inside diameter of the braking surfaces. Flat section rotors are identified by the location of their attachment interface surfaces. Both the mounting face and the face which comes in contact with the fastening mechanism are axially located between the braking surfaces. The entire m
17、ounting flange has a maximum diameter which is smaller than the inside diameter of the braking surfaces. At the time of publication, there were no high volume class 5-8 rotors in North America that conform to this description. OutboardEndMountingFaceContactFaceBrakeFaceContactFaceBrakeFaceBrakeFaceB
18、rakeFaceMountingFaceInboardEndCenterSectionSAE J2696 Issued MAY2012 Page 4 of 11 FIGURE 2 - ROTOR INTERFACE DIMENSIONS - U SECTION ROTORS SAE J2696 Issued MAY2012 Page 5 of 11 TABLE 1 - U-SECTION BRAKE ROTOR DIMENSIONS A B C D E F G H MountingSystem No. of Studs or BoltsMounting Bolt Circle .38 (.01
19、5 )Pilot Hole DiameterMountingThru Hole Size or ThreadMinimumChamferChamferAngleMinimumPilotLengthMaximum PilotRadiusAi 10 266.70(10.500)216.00/215.90(8.504/8.500)5/8-183.56(.140)4510.41(.410)2.03(.080)Aii 10 249.50(9.823)194.08/194.01(7.641/7.638)M16 x 2 22.49(.885)3528.83(1.135)1.14(.045)Aiii 10 2
20、49.50(9.823)194.08/194.01(7.641/7.638)5/8-186.60(.260)4516.89(.665)2.29(.090)Aiv 10 249.50(9.823)219.99/219.91(8.661/8.658)5/8-112.50(.098)209.90(.390)2.70(.107)Av 10 285.75(11.250)241.40/241.30(9.504/9.500)26.92(1.060)1.52(.060)458.64(.340)2.03(.080)Avi 8 266.70(10.500)216.00/215.90(8.504/8.500)5/8
21、-183.56(.140)4510.41(.410)2.03(.080)SAE J2696 Issued MAY2012 Page 6 of 11 FIGURE 3 - HUB INTERFACE DIMENSIONS FOR USE WITH U-SECTION ROTORS SAE J2696 Issued MAY2012 Page 7 of 11 TABLE 2 - DISC BRAKE HUB DIMENSIONS FOR USE WITH U-SECTION ROTORS A B J K L M N P Q R MountingSystem No. of StudsorBoltsMo
22、untingBolt Circle .38 (.015 )Pilot Diameter NominalMountingThruHoleSize or ThreadMaximum Pilot Root Radius1Maximum PilotLengthNominalMountingCounterBoreDiameterMinimumMountingCounterBoreDepthMountingPilotChamferAngleMaximum MountingPilotChamferLengthAi 10 266.70(10.500)215.82/215.72(8.497/8.493)16.6
23、6(.656)3.43(.135)6.73(.265)38.10(1.500)14.63(.576)45.97(.038)Aii 10 249.50(9.823)193.93/193.85(7.635/7.632)16.99(.669)17.86(.703)27.13(1.068)N/A N/A 45 2.29(.090)Aiii 10 249.50(9.823)194.00/193.93(7.638/7.635)17.00(.669)5.48(.216)14.34(.565)25.50(1.004)17.60(.693)45 N/A Aiv 10 249.50(9.823)219.86/21
24、9.81(8.656/8.654)16.66(.656)0.00(.000)6.35(.250)36.83(1.450)17.02(.670)202.8(.110)Av 10285.75(11.250)241.30/241.22(9.500/9.497)25.40(1.000)1.52(.060)6.60(.260)N/A N/A N/A N/AAvi 8 266.70(10.500)215.82/215.72(8.497/8.493)16.66(.656)3.43(.135)6.73(.265)38.10(1.500)14.63(.576)45.97(.038)1Pilot root rad
25、ii identified as “0.00” may require an undercut. SAE J2696 Issued MAY2012 Page 8 of 11 FIGURE 4 - ROTOR INTERFACE DIMENSIONS - HAT SECTION ROTORS SAE J2696 Issued MAY2012 Page 9 of 11 TABLE 3 HAT SECTION BRAKE ROTOR DIMENSIONS A B C D E F G MountingSystem No. of Studs or BoltsMounting Bolt Circle .3
26、8 (.015 )Pilot Hole DiameterNominalMountingThru Hole Size or Thread MinimumChamferChamferAngleMinimumPilotLengthBi 10 184.15(7.250)152.50/152.43(6.004/6.001)15.09(.594)1.50(.059)4516.75(.659)Bii 10 184.15(7.250)152.50/152.43(6.004/6.001)14.70(.579)2.29(.090)459.65(.380)Biii 10 184.15(7.250)152.48/15
27、2.40(6.003/6.000)15.09(.594)1.02(.040)4510.67(.420)Biv 8 184.15(7.250)152.50/152.43(6.004/6.001)15.09(.594)1.50(.059)4516.75(.659)Bv 6 171.45(6.750)137.24/137.16(5.403/5.400)19.46(.766)1.02(.040)4510.67(.420)Bvi110 199.64(7.860)166.62/166.37(6.560/6.550)16.77(.660)3.18(.125)45 N/A Bvii 16 221.50(8.7
28、20)192.40/192.33(7.575/7.572)15.09(.594)2.20(.087)45 N/A Bviii 10 219.70(8.650)187.62/187.56(7.387/7.384)12.70(.500)3.05(.120)4511.43(.450)1Rotors pilot on the mounting stud body. SAE J2696 Issued MAY2012 Page 10 of 11 FIGURE 5 - HUB INTERFACE DIMENSIONS FOR USE WITH HAT SECTION ROTORS SAE J2696 Iss
29、ued MAY2012 Page 11 of 11 TABLE 4 - DISC BRAKE HUB DIMENSIONS FOR USE WITH HAT SECTION ROTORS A B J K L M N P Q R MountingSystem No. of StudsorBoltsMountingBolt Circle .38 (.015 )Pilot Diameter MountingThru Hole Size or ThreadMaximum Pilot Root Radius1Maximum Pilot Length MountingCounterBoreDiameter
30、MountingCounterBoreDepthMountingPilotChamferAngleMountingPilotChamferLengthBi 10 184.15(7.250)152.40/152.32(6.000/5.997)9/16-120.00(.000)7.87(.310)N/A N/A 45 N/A Bii 10 184.15(7.250)152.37/152.27(5.999/5.995)9/16-12.76(.030)6.35(.250)N/A N/A N/A N/A Biii 10 184.15(7.250)149.86/149.78(5.900/5.897)9/1
31、6-123.30(.130)8.89(.350)N/A N/A N/A N/A Biv 8 184.15(7.250)152.40/152.32(6.000/5.997)9/16-120.00(.000)7.87(.310)N/A N/A 45 N/A Bv 6 171.45(6.750)133.43/133.35(5.253/5.250)3/4-102.03(.080)6.35(.250)N/A N/A N/A N/A Bvi210 199.64(7.860)N/A 5/8-11 N/A N/A N/A N/A N/A N/A Bvii 16 221.50(8.720)192.28/192.
32、17(7.570/7.566)M14 x 2 1.90(.075)N/A N/A N/A N/A N/A Bviii 10 219.70(8.650)187.48/187.43(7.381/7.379)1/2-202.79(.110)22.45(.884)N/A N/A N/A N/A 1Pilot root radii identified as “0.00” may require an undercut. 2Rotors pilot on the mounting stud body. PREPARED BY THE SAE TRUCK AND BUS WHEEL COMMITTEE OF THE SAE TRUCK AND BUS BRAKE AND STABILITY CONTROL STEERING COMMITTEE
