1、AEROSPACE STANDARDBEARING, BALL, AIRFRAME,ANTI-FRICTION, HEAVY DUTY, CORROSIONRESISTANT NITROGEN STEEL (CREN)AS27640/1Copyright 2016 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electron
2、ic, 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)Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgISSUED2011-03REV
3、ISED2016-01THIRD ANGLE PROJECTIONCUSTODIAN: ACBGREV.AFEDERAL SUPPLY CLASS3110AS27640/1SHEET 1 OF 4REV.APROCUREMENT SPECIFICATION: AS7949SAE Technical StandardsBoardRulesprovidethat:“ThisreportispublishedbySAE toadvancethestateoftechnicalandengineering sciences. The use of thisreport isentirelyvolunt
4、ary, andits applicability andsuitability for any particularuse, includingany patent infringement arising therefrom,isthesoleresponsibility of theuser.”SAE reviewseachtechnical reportatleasteveryfiveyearsatwhichtimeitmayberevised,reaffirmed,stabilized,orcancelled.SAEinvites yourwritten comments andsu
5、ggestions.SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS27640/1ARATIONALETHIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RINGS AND THE HEAT TREAT REQUIREMENT. AMS3666 IS BEING REMOVED AS A SEAL MA
6、TERIAL AS NO SUPPLIER UTILIZES IT ON THIS SERIES. THE LUBRICATION IS BEING REVISED FROM A TRADE NAME TO AN INDUSTRY AVAILABLE SPECIFICATION MIL-PRF-23827 TYPE 1. ZINC NICKEL PER AMS2417 WILL BE INDICATED BY “E” SUFFIX. ADDS PASSIVATION IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID). CRES BALLS W
7、ILL BE INDICATED BY “T” SUFFIX.NOTICETHE COMPLETE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THISDOCUMENT AND THE LATEST ISSUE OF AS7949.FIGURE 1 - CREN AIRFRAME BEARINGAEROSPACE STANDARDAS27640/1SHEET 2 OF 4REV.ABEARING, BALL, AIRFRAME,ANTI-FRICTION, HEAVY DUTY, CORROS
8、IONRESISTANT NITROGEN STEEL (CREN)TABLE 1 - DIMENSIONS, LOAD RATINGS, WEIGHT, AND TORQUEASDASHNO.BBORE+.0000-.00052/DOUTSIDEDIAMETER+.0000-.00051/ 2/WWIDTHINNERRING+.000-.0051/HWIDTHOUTERRING+.000-.0051/(A)SHOULDERDIAMETERINNERRING(REF)E4/C3/RADIALLIMITLOADRATINGLBTHRUSTLIMITLOADRATINGLB5/ 6/RADIAL
9、LOAD RATING(LB) FOR AVERAGELIFE OF 10,000COMPLETE 90 CYCLESWEIGHTPOUNDS(APPROX)7/MAXIMUMSTARTINGTORQUE(IN-OZ)CORNER CHAMFER X 45INNERRING BORE+.015-.000OUTERRING OD+.015-.000 CASE I CASE II-3A .1900 .6250 .245 .203 .280 .005 .010 1,560 700 1,520 1,260 .01 2.0-3 .1900 .7774 .297 .270 .331 .005 .022 1
10、,880 900 1,700 1,450 .03 2.0-4 .2500 .9014 .484 .335 .390 .005 .032 2,680 1,200 2,410 2,030 .04 2.0-5 .3125 1.2500 .558 .375 .469 .015 .032 5,620 2,500 4,900 3,970 .09 2.0-6 .3750 1.4375 .620 .469 .591 .015 .032 7,910 3,500 6,540 5,410 .15 3.0-8 .5000 1.6875 .620 .500 .768 .015 .044 11,800 5,200 9,3
11、20 7,700 .21 4.0-10 .6250 1.9375 .620 .500 .850 .015 .044 14,100 6,200 11,000 9,060 .28 4.01/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT.2/ OUT-OF-ROUND TOLERANCES: BORE: +.0002, -.0007; OUTER DIA: +.0005, -.0010.3/ A RADIUS GIVING APPROXIMATELY THE SAME GRIP FOR STAKING THE BEARING IN THE HOU
12、SING WILL BE ACCEPTABLE.4/ A RADIUS GIVING APPROXIMATELY THE SAME FILLET CLEARANCE WILL BE ACCEPTABLE.5/ CASE I - LOAD FIXED WITH RESPECT TO OUTER RING.CASE II - LOAD FIXED WITH RESPECT TO INNER RING.6/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. FOR OPERATION UP TO 350 F, THE RATINGS SHALL BE REDU
13、CED BY 20%.7/ SPECIFIED LIMITS ARE FOR BEARINGS LUBRICATED WITH MIL-PRF-81322 GREASE. FOR BEARINGS LUBRICATED WITH MIL-PRF-23827 TYPE I GREASE, THE TORQUE LIMIT SHALL BE THE SPECIFIED VALUE IN THE TABLE MULTIPLIED BY 1.2.REQUIREMENTS:1. MATERIAL:RINGS: CORROSION RESISTANT NITROGEN STEEL (CREN) PER A
14、MS5898, AMS5925 OR AISI 422 STEEL PER AMS5655.BALLS: NO SUFFIX CODE: CORROSION RESISTANT NITROGEN STEEL (CREN) PER AMS5898 OR AMS5925.SUFFIX CODE “T“: CORROSION RESISTANT STEEL (CRES) PER AMS5880 OR AMS5618. CRES BALLS SHALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR METHOD
15、2 (CITRIC ACID), OR ASTM A967/A967M, CITRIC I, II, OR III. SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652.SEAL RETAINERS: ANY CORROSION RESISTANT STEEL.2. HARDNESS:RINGS: STEEL PER AMS5898 AND AMS5925: THROUGH HARDEN TO 58 HRC MINIMUM.STEEL PER AMS5655: RING WALL THICKNESS AT RACEWAY .090 OR LESS
16、: CASE HARDEN TO 58 HRC MINIMUM AT A CASE DEPTH OF 1/3 OF THE WALL THICKNESS.RING WALL THICKNESS AT RACEWAY GREATER THAN .090: CASE HARDEN TO 58 HRC MINIMUM AT A CASE DEPTH OF .030BALLS: 58 HRC MINIMUM.3. STABILITY:RINGS AND BALLS SHALL BE STABILIZED FOR OPERATION UP TO 350 F.AEROSPACE STANDARDAS276
17、40/1SHEET 3 OF 4REV.ABEARING, BALL, AIRFRAME,ANTI-FRICTION, HEAVY DUTY, CORROSIONRESISTANT NITROGEN STEEL (CREN)4. LUBRICANT:MIL-PRF-81322 OR MIL-PRF-23827 TYPE I. ALL BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILLCONFORMING TO MIL-PRF-81322 UNLESS OTHERWISE SPECIFIED. IF MIL-PRF-23827 TYP
18、E I IS REQUIRED, ADD THEDESIGNATOR “G“ AFTER THE AS27640/1 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F.5. SURFACE ROUGHNESS:RACEWAYS AND BALLS SHALL HAVE A 0$;,080685)$&(528*+1(662)LQ5D3(5$60(%6. SURFACE TREATMENT:NO SUFFIX CODE ALL EXTERNAL SURF
19、ACES EXCEPT BORE AND SEALS SHALL BE PLATED WITH CADMIUM PER AMS-QQ-P-416, TYPE I, CLASS 2, .0003 TO .0006 THICK.SUFFIX CODE “E” ALL EXTERNAL SURFACES EXCEPT BORE AND SEALS SHALL BE PLATED WITH ZINC NICKEL PER AMS2417, TYPE 2, GRADE B .0003 TO .0006 THICK.SUFFIX CODE “P” ALL RING AND BALL SURFACES SH
20、ALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A967/A967M, CITRIC I, II, OR III.7. RADIAL INTERNAL CLEARANCE:NO SUFFIX CODE: .0004 TO .0010SUFFIX CODE “R“: .0002 TO .00058. ECCENTRICITIES:RADIAL LATERALINNER RING: .0010 MAXIMUM INNER RING: .00
21、10 MAXIMUMOUTER RING: .0016 MAXIMUM OUTER RING: .0016 MAXIMUM9. PART NUMBER:THE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE.AS 27640/1 - 4 R G P T = BEARING, BALL, AIRFRAME, ANTIFRICTION, HEAVY DUTY, CREN, .2500 BORE, .0002 TO .0005 RADIAL
22、INTERNAL CLEARANCE, FILLED 80% MIN. WITH MIL-PRF-23827 TYPE I (250 F MAX. TEMP.), PASSIVATED, CRES BALLS.BALL MATERIAL CODE (SEE REQUIREMENT 1)SURFACE TREATMENT CODE (SEE REQUIREMENT 6)LUBRICANT CODE (SEE REQUIREMENT 4)RADIAL INTERNAL CLEARANCE CODE (SEE REQUIREMENT 7)“AS” DASH NUMBER (SEE TABLE 1)A
23、EROSPACE SERIESAEROSPACE STANDARD (AS) PREFIXAEROSPACE STANDARDAS27640/1SHEET 4 OF 4REV.ABEARING, BALL, AIRFRAME,ANTI-FRICTION, HEAVY DUTY, CORROSIONRESISTANT NITROGEN STEEL (CREN)NOTES:WARNINGTHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YO
24、U HAVE QUESTIONS CONCERNING CADMIUMS USE.1. ALL DIMENSIONS ARE IN INCHES, UNLESS OTHERWISE SPECIFIED.2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS SPECIFICATION AND REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD TAKES PRECEDENCE.3. REFERENCED DOCUMENTS SHALL BE OF THE ISSUE IN EFFECT ON
25、 DATE OF INVITATION FOR BIDS.4. REVISION INDICATOR: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 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.
