1、AEROSPACE STANDARD (R) BEARING, BALL, AIRFRAME, ANTI-FRICTION, DOUBLE ROW, HEAVY DUTY AS27644Copyright 2012 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocop
2、ying, 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.org ISSUED 1998-04REVISED 2012-07THIRD AN
3、GLE PROJECTION CUSTODIAN: SAE AIRFRAME CONTROL BEARINGS GROUP REV.CFEDERAL SUPPLY CLASS 3110 AS27644SHEET 1 OF 3REV. CPROCUREMENT SPECIFICATION: SAE AS7949SAE Technical Standards Board Rules provide that: “This report ispublishedby SAE toadvance thestate of technicalandengineering sciences. Theuse o
4、fthis report is entirely voluntary, andits applicability and suitability forany particular use,including any patent infringement arising therefrom, isthe soleresponsibilityofthe user.”SAE reviews eachtechnicalreport at least every five years at which time itmay bereaffirmed, revised, orcancelled. SA
5、E invites yourwrittencomments andsuggestions. RATIONALE IN ORDER TO BRING THE AS27644 DOCUMENT UP TO DATE WITH ALL THE REFERENCE DOCUMENTS, REVISION WAS CREATED. THE CHANGES MADE WERE EDITORIAL AND TO MAKE THE FORMAT THE SAME AS SIMILAR DOCUMENTS WITHIN THE WORKING GROUP. A CODE “E” FOR USE OF ZINC-
6、NICKEL PLATING WAS IMPLEMENTED. THE ADDITION OF SPECIFYING TYPE I FOR MIL-PRF-23827 GREASE AND THE ADDITION OF THE CADMIUM NOTE WAS ALSO ADDED. SEAL MATERIAL POLYTETRAFLUOROETHYLENE SHEET PER AMS3666 WAS REMOVED. NOTICE UNDER DEPARTMENT OF DEFENSE POLICIES AND PROCEDURES, ANY QUALIFICATION REQUIREME
7、NTS AND ASSOCIATED QUALIFIED PRODUCTS LIST ARE MANDATORY FOR DOD CONTRACTS. ANY REQUIREMENT RELATING TO QUALIFIED PRODUCTS LISTS / DATABASES (QPL/QPDS) HAS NOT BEEN ADOPTED BY SAE AND IS NOT PART OF THIS TECHNICAL REPORT. THE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF T
8、HIS SPECIFICATION SHEET AND THE LATEST ISSUE: SAE AS7949. FIGURE 1 - PART CONFIGURATION SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS27644CCopyright SAE International Provided by IHS under license with SAENot for ResaleNo re
9、production or networking permitted without license from IHS-,-,-AEROSPACE STANDARD AS27644SHEET 2 OF 3REV. C(R) BEARING, BALL, AIRFRAME, ANTI-FRICTION, DOUBLE ROW, HEAVY DUTY TABLE 1 - DIMENSIONS AND LOADS MS DASH NO.BBORE +.0000 -.0005 2/ DOUTSIDE DIAMETER +.0000 -.0005 1/ 2/ WWIDTH INNER RING+.000
10、 -.005 1/ HWIDTH OUTER RING+.000 -.005 1/ (A) SHOULDER DIAMETER INNER RING(APPROX) E4/ C3/ AXIAL INTER-NAL CLEAR-ANCE MAX RADIAL LIMIT LOAD RATINGLB THRUSTLIMIT LOAD RATINGLB 5/ 6/ RADIAL LOAD RATING (LB) FOR AVERAGE LIFE OF 10 000 COMPLETE 90 CYCLES WEIGHT POUNDS(APPROX)LB CORNER CHAMFER X 45 9/ IN
11、NER RING BORE+.015 -.000 OUTER RING OD +.015 -.000 MAXIMUM STARTING TORQUECASE I CASE II (in-oz) -3 .1900 .7774 .495 .473 .302 .005 .018 .005 7/ 2950 1700 2950 2830 .04 1.0 -4 .2500 .9014 .620 .491 .410 .005 .032 .006 7/ 5370 1800 3550 3020 .06 1.0 -5 .3125 1.2500 .745 .687 .469 .015 .032 .006 8/ 11
12、000 4000 7360 6250 .17 1.5 -6 .3750 1.4375 .870 .794 .551 .015 .032 .006 8/ 15760 5300 9690 8120 .26 2.0 -8 .5000 1.6875 .932 .856 .735 .015 .044 .007 23600 7800 14100 11600 .38 3.0 -10 .6250 1.9375 .995 .920 .890 .015 .044 .007 28400 9400 15300 13100 .53 4.5 1/ ALL DIMENSIONS TO BE MET AFTER PLATIN
13、G. 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 HOUSING WILL BE ACCEPTABLE. 4/ A RADIUS GIVING APPROXIMATELY THE SAME FILLET CLEARANCE WILL BE ACCEPTABLE. 5/ CASE I - LOAD FIXED WITH RESPECT
14、 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 REDUCED BY 20%. 7/ BOLTS OF160 000 PSI TENSILE STRENGTH ARE REQUIRED TO DEVELOP THE RADIAL LIMITLOAD SHOWN. 8/ BOLTS OF180 000 PSI TENSILE
15、STRENGTH ARE REQUIRED TO DEVELOP THE RADIAL LIMITLOAD SHOWN. 9/ 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: R
16、INGS AND BALLS: 52100 STEEL PER AMS6440 OR AMS6444 SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652 SEAL RETAINERS: ANY CORROSION RESISTANT STEEL 2. LUBRICANT: MIL-PRF-81322 OR MIL-PRF-23827 TYPE I. ALL BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILL CONFORMING TO MIL-PRF-81322 UNLESS OTHE
17、RWISE SPECIFIED. IF MIL-PRF-23827 TYPE I IS REQUIRED, ADD THE DESIGNATOR “G“ AFTER THE MS27644 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F. 3. HARDNESS: HEAT TREAT RINGS AND BALLS TO 60-66 HRC AND STABILIZE FOR OPERATION AT 250 F 4. SURFACE ROUGH
18、NESS: RACEWAYS AND BALL SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 in Ra PER ANSI/ASME B46.1 5. PLATING: ALL EXTERNAL SURFACES EXCEPT BORE, SEALS AND SEAL RETAINERS SHALL BE PLATED .0003 TO .0006 THICK WITH: (NO DESIGNATOR) CADMIUM IN ACCORDANCE WITH AMS-QQ-P-416, TYPE I, CLASS 2 DESIGNATOR “E” ZIN
19、C-NICKEL IN ACCORDANCE WITH AMS2417, TYPE 2, GRADE B 6. RADIAL INTERNAL CLEARANCE: .0004 TO .0010 7. RADIAL ECCENTRICITY: INNER RING, .0010 MAX, OUTER RING, .0016 MAX. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without lice
20、nse from IHS-,-,-AEROSPACE STANDARD AS27644SHEET 3 OF 3REV. C(R) BEARING, BALL, AIRFRAME, ANTI-FRICTION, DOUBLE ROW, HEAVY DUTY 8. PART NUMBER: THE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE: EXAMPLE OF PART NUMBER: MS27644 -4GE = BEARING, BALL, AIRFRAME
21、, ANTIFRICTION, DOUBLE ROW, HEAVY DUTY .2500 INCH BORE, .0004 TO .0010 INCH RADIAL INTERNAL CLEARANCE, FILLED 80% MINIMUM WITH MIL-PRF-23827 TYPE I LUBRICANT, 250 F MAX. WITH ZINC-NICKEL PLATING ZINC-NICKEL PLATING (SEE PLATING DESIGNATOR) LUBRICANT (SEE LUBRICANT DESIGNATOR) DASH NUMBER (SEE TABLE
22、1) BASIC PART NUMBER NOTES: WARNINGTHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU 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 S
23、PECIFICATION AND REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD TAKES PRECEDENCE. 3. REFERENCED DOCUMENTS SHALL BE OF THE ISSUE IN EFFECT ON DATE OF INVITATION FOR BIDS. 4. THE PARTS COVERED BY MS20207 ARE CANCELLED. USE AS27644 FOR NEW DESIGN AND REPLACEMENT. 5. A CHANGE BAR (l) LOCATED IN THE
24、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. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
