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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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 2003 Society of Automotive Engineers, Inc.All rights reserved. No part of this
3、 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: 724-776-4970 (o
4、utside USA)Fax: 724-776-0790Email: custsvcsae.orgSAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLERECOMMENDEDPRACTICEJ1857REV.APR2003Issued 1987-05Revised 2003-04Superseding J1857 JAN1997Flywheel Dimensions for Truck and Bus Applications1. ScopeAlthough not limited to, these flywheels are normally us
5、ed on trucks considered as Medium-Duty(Class 6 and 7), as well as Heavy-Duty (Class 8) trucks.1.1 PurposeThis SAE Recommended Practice defines flywheel configurations to promote standardization ofclutch installation and mounting dimensions for flywheels used with pull type single- and twin-plate tru
6、ckclutches.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA
7、 15096-0001.SAEJ1033Procedure for Measuring Bore and Face Runout of Flywheels, Flywheel Housings, andFlywheel Housings AdaptersSAE J1731Pilot Bearings for Truck and Bus ApplicationsSAE J1806Clutch Dimensions for Truck and Bus Applications3. Flywheel SpecificationsThis section covers recommended flyw
8、heel dimensional specifications for severaldifferent clutch and flywheel combinations. Unless otherwise specified, dimensions listed are nominal. Thisdocument applies to new flywheels and does not attempt to provide service machining limits for remachinedflywheels.3.1 Flat Type Flywheels for Use wit
9、h 14-in Single- and Twin-Plate Clutches (Typically Medium-DutyApplications)See Table 1 and Figure 1.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-2-TABLE 1FLAT TYPE FLYWHEEL
10、S FOR USE WITH 14-in SINGLE-AND TWIN-PLATE CLUTCHESFLYWHEEL DIMENSIONS(REFERENCE FIGURE 1)mm inReferenceNoteA 180 - 184.25 7.09 - 7.25B 420.0 Min 16.54 Min (1)(2)1. Clutch is located with mounting screws and no pilot lip is required. B gives outer diameter of flat face required to seat the clutch ag
11、ainst the flywheel.2. Face runout is 0.013 mm (0.0005 in) TIR per inch of diameter and applies between diame-ter A and B. Reference SAE J1033.E 100.1 3.94 (3)3. Preferred dimensions. Optional design: 105.0 mm (4.13 in).F 393.7 15.50G 66.5 2.62K 16.0 0.63 (4)(5)4. Pilot bearing dimensions. Reference
12、SAE J1731 for flywheel pilot bearing bore toler-ances.5. Preferred bearing. Optional Bearing: K = 15.0 mm (0.59 in) and L = 52.0 mm (2.05 in).L 62.0 2.44 (4)(5)N 6.6 Min 0.260 Min (6)6. N is the clearance required for clutch dampers, including the maximum clutch face wear. Refer to SAE J1806 for spe
13、cific details of the clutch envelopes.P 62.0 Min 2.44 Min (7)7. P is the clearance required for the clutch and transmission shaft.T 3/8-16 NC-2B 20 Min12 Holes EquallySpacedCounterbore 9.54 to 9.603/8-16 NC-2B 0.79 Min12 Holes Equally spacedCounterbore 0.376 to 0.378(8)8. Clutch to be piloted by usi
14、ng shoulder cap screws. Contact clutch manufacturers for the clutch mounting bolt dimensions and tolerances.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-3-FIGURE 1FLAT FLYW
15、HEEL FOR 14-in SINGLE- ANDTWIN-PLATE CLUTCHESCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-4-3.2 Pot Type Flywheels for Use with 14-in Twin-Plate Clutches (Typically Heavy-D
16、uty Applications)SeeTable 2 and Figure 2.TABLE 2POT TYPE FLYWHEELS FOR USE WITH 14-in TWIN-PLATECLUTCHESFLYWHEEL DIMENSIONS(REFERENCE FIGURE 2)mm inReferenceNotesA 180.0 - 184.0 7.09 - 7.24D 374.00 - 374.78 14.725 - 14.755E 100.1 3.94F 393.7 15.5G 63.5 2.50H 374.65 - 374.73 14.750 - 14.753J 74.47 -
17、74.73 2.932 - 2.942K 19.1 0.75 (1)(2)1. Pilot bearing dimensions. Reference SAE J1731 for flywheel pilot bearing bore tolerances.2. Preferred bearing. Optional Bearing: K = 16.0 mm (0.63 in) and L = 62.0 mm (2.445 in).L 72.0 2.83 (1)(2)M 4.57 min. 0.18 minN 6.6 Min 0.260 Min (3)3. N is the clearance
18、 required for clutch dampers, including the maximum clutch face wear. Refer to SAE J1806 for specific details of the clutch envelopes.P 72.0 Min 2.83 Min (4)4. P is the clearance required for the clutch and transmission shaft.T 3/8-16 NC-2B 55.3 Min12 Holes EquallySpaced3/8-16 NC-2B 2.18 Min12 Holes
19、 EquallySpacedU 19.1 0.75V 12.67 - 12.7112 Holes EquallySpaced0.4990 to 0.500512 Holes EquallySpacedCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-5-FIGURE 2POT TYPE FLYWHEEL
20、 FOR 14-in TWIN-PLATE CLUTCHESCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-6-3.3 Flat Type Flywheels for Use with 15.5-in Twin-Plate Clutches and 16-in Single-Plate Clutche
21、s (TypicallyHeavy-Duty Applications)See Tables 3 and 4 and Figure 3.TABLE 3FLAT TYPE FLYWHEELS FOR USE WITH 15.5-in TWIN-PLATE CLUTCHESAND 16-in SINGLE-PLATE CLUTCHESFLYWHEEL DIMENSIONS(REFERENCE FIGURE 3)mm inReferenceNotesA See Table 4 See Table 4E 100.1 3.94F 422.28 16.625G 63.5 2.50H 435.76 - 43
22、5.84 17.156 - 17.159K 19.0 0.75 (1)(2)1. Pilot bearing dimensions. Reference SAE J1731 for flywheel pilot bearing bore tolerances.2. Preferred bearing. Optional bearing: K = 16.0 mm (0.63 in) and L = 62.0 mm (2.445 in).L 72.0 2.83 (1)(2)M 3.56 - 4.57 0.140 - 0.180N See Table 4 See Table 4 (3)3. N is
23、 the clearance required for clutch dampers, including the maximum clutch face wear. Refer to SAE J1806 for specific details of the clutch envelopes.P 72.0 Min 2.83 Min (4)4. P is the clearance required for the clutch and transmission shaft. Details of the clutch envelopes.T 7/16-14 NC-2B 20.0 Min.12
24、 Holes EquallySpaced7/16-14 NC-2B 0.79 Min.12 Holes EquallySpacedTABLE 4FLYWHEEL DIMENSIONS(REFERENCE FIGURE 3)TypeAmmAinNmmNin1(1)1. Traditional Dimensions for Either Organic or Ceramic Faced Clutches.219.0 - 222.5 8.62 - 8.76 6.60 Min 0.260 Min2(2)2. Dimensions for Larger Damper Section Ceramic Fa
25、ced Clutches.256.5 - 257.5 10.10 - 10.14 9.40 Min 0.370 MinCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-7-FIGURE 3FLAT FLYWHEEL FOR 15.5-in TWIN-PLATE AND 16-in SINGLE-PLAT
26、E CLUTCHESCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-8-3.4 Flat Type Flywheels for Use with 17-in Single-Plate Clutches (Typically Heavy-Duty Applications)SeeTables 5 and
27、 6 and Figures 4 and 5.TABLE 5FLAT TYPE FLYWHEELS FOR USE WITH 17-in SINGLE-PLATE CLUTCHESFLYWHEEL DIMENSIONS(REFERENCE FIGURE 4)mm inReferenceNotesA See Table 6 See Table 6E 100.1 3.94F 450.00 17.717G 59.9 2.36H 475.00 - 475.10 18.701 - 18.705K 19.0 0.75 (1)1. Pilot bearing dimensions. Reference SA
28、E J1731 for flywheel pilot bearing bore tolerances.L 72.0 2.83 (1)M 5.5 - 8.5 0.22 - 0.33N See Table 6 See Table 6 (2)2. N is the clearance required for clutch dampers, including the maximum clutch face wear. Refer to SAE J1806 for specific details of the clutch envelopes.P 72.0 Min 2.83 Min (3)3. P
29、 is the clearance required for the clutch and transmission shaft.T 7/16-14 NC-2B 20.0 Min12 HolesUnequally Spaced7/16-14 NC-2B 0.79 Min12 HolesUnequally Spaced(4)(5)4. American standard thread size. Optional thread size is metric M10 x 1.5 - 6H.5. See Figure 5 for bolt hole spacing.TABLE 6FLYWHEEL D
30、IMENSIONSREFERENCE FIGURE 4Type AmmAinNmmNin1(1)1. Traditional Dimensions for Either Organic or Ceramic Faced Clutches.235.7 - 238.3 9.28 - 9.38 7.65 Min 0.301 Min2(2)2. Dimensions for Larger Damper Section Ceramic Faced Clutches256.5 - 257.5 10.10 - 10.14 9.40 Min 0.370 MinCopyright SAE Internation
31、al Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003-9-FIGURE 4FLAT FLYWHEEL FOR 17-in SINGLE-PLATE CLUTCHESCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction o
32、r networking permitted without license from IHS-,-SAE J1857 Revised APR2003-10-FIGURE 5BOLT HOLE SPACING FOR FLAT FLYWHEEL17-in SINGLE-PLATE CLUTCHES4. Notes4.1 Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the user in locatingareas where revisions have been
33、 made to the previous issue of the report. An (R) symbol to the left of thedocument title indicates a complete revision of the report.PREPARED BY THE SAE TRUCK AND BUS CLUTCH SUBCOMMITTEE OF THESAE TRUCK AND BUS CHASSIS AND POWERTRAIN COMMITTEECopyright SAE International Provided by IHS under licens
34、e with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1857 Revised APR2003RationaleThe only change to this document was changing the value in the Dimensional Tolerancing box inTable 1 under “in” from 0.25 to 0.0098 or 0.010.Relationship of SAE Standard to IS
35、O StandardNot applicable.ApplicationThis SAE Recommended Practice defines flywheel configurations to promote standardization ofclutch installation and mounting dimensions for flywheels used with pull type single and twin plate truckclutches.Reference SectionSAE J1033Procedure for Measuring Bore and
36、Face Runout of Flywheels, Flywheel Housings, andFlywheel Housings AdaptersSAE J1731Pilot Bearings for Truck and Bus ApplicationsSAE J1806Clutch Dimensions for Truck and Bus ApplicationsDeveloped by the SAE Truck and Bus Clutch SubcommitteeSponsored by the SAE Truck and Bus Chassis and Powertrain CommitteeCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
