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1、A Reference number ISO 14221:1998(E) INTERNATIONAL STANDARD ISO 14221 First edition 1998-05-15 Aerospace Airframe ball bearings, single-row, self-aligning, precision, sealed, light duty Inch series Aronautique et espace Roulements pour structures daronefs: roulements, rotule, de prcision, sur une ra
2、nge de billes, avec joints dtanchit, srie lgre Srie en inches Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license
3、from IHS -,-,- ISO 14221:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Internat
4、ional Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetcentraliso.ch X.400c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
5、(ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, g
6、overnmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to
7、 the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 14221 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 15, Airframe bearings. Annex A
8、of this International Standard is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from I
9、HS -,-,- ISOISO 14221:1998(E) iii Introduction At the time this International Standard was developed, the Imperial unit sizes of airframe ball bearings were dominant in world application. The basis for this International Standard is the Imperial units provided in annex A. For new applications, the u
10、se of metric series airframe ball bearings is encouraged. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from
11、 IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 14221:
12、1998(E) 1 Aerospace Airframe ball bearings, single-row, self-aligning, precision, sealed, light duty Inch series 1 Scope This International Standard specifies the characteristics, boundary dimensions, tolerances, internal clearances and permissible loads of inch series, single-row, self-aligning, se
13、aled, light duty ball with increased precision and reduced internal clearances used in airframe applications. These bearings are full complement (without cage) with a single row of balls. These bearings are designed to withstand only slow rotations and oscillations under axial load and are intended
14、for use between fixed and moving parts of an aircraft structure and their control surfaces. The airframe ball bearings covered by this International Standard are designed to operate in the temperature range of 54 C to + 150 C. 2 Normative references The following standards contain provisions which,
15、through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of
16、applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 683-17:1), Heat-treated steels, alloy steels and free-cutting steels Part 17: Ball and roller bearing steels. ISO 1132:1980, Rolling bearings
17、Tolerances Definitions. ISO 2082:1986, Metallic coatings Electroplated coatings of cadmium on iron or steel. ISO 4520:1981, Chromate conversion coatings on electroplated zinc and cadmium coatings. ISO 5593:1997, Rolling bearings Vocabulary. ISO 8075:1985, Aerospace Surface treatment of hardenable st
18、ainless steel parts. ISO 14190:1998, Aerospace Airframe rolling bearings: ball and spherical roller bearings Technical specification. AMS 2417E:1993, Plating, zinc-nickel alloy.2) 1) To be published. (Revision of ISO 683-17:1976) 2) Available from: SAE International 400 Commonwealth Drive Warrendale
19、, PA 15096-0001 USA Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14221:1998(E) ISO 2 3 D
20、efinitions For the purposes of this International Standard, the definitions given in ISO 5593 apply. 4 Symbols 4.1 For the purposes of this International Standard, the symbols given in ISO 1132 apply. The symbols (except those for tolerances) shown in figure 1 and the values given in tables 1 and A.
21、1 denote nominal dimensions unless specified otherwise. 4.2 Additional symbols for bearings covered by this International Standard are the following. Cspermissible static radial load Fa maxpermissible static axial load 5 Required characteristics 5.1 Dimensions Tolerances Internal clearances Loads Va
22、lues are given in table 1. Where plating is specified, tolerances are applicable after plating. Configuration is given in figure 1. The configuration for and installation process of seals are at the manufacturers option. 5.2 Surface roughness Inner and outer ring raceways and rolling elements shall
23、have a surface roughness of Ra = 0,2 m max. Bore, side faces and cylindrical outer surface shall have a surface roughness of Ra = 0,8 m max. before surface treatment. 6 Materials 6.1 Low alloy through hardening bearing steel (code letter F, D, M and Z) Rings:bearing steel ISO 683-17, type 1, surface
24、 hardness 59 HRC to 64 HRC (710 HV to 840 HV). Balls:bearing steel ISO 683-17, type 1, heat treated to 59 HRC to 64 HRC (710 HV to 840 HV). 6.2 Corrosion-resistant stainless steel (code letters C and H) Rings: bearing steel ISO 683-17, type 21, hardness 58 HRC ( 670 HV). Balls:bearing steel ISO 683-
25、17, type 21, hardness 58 HRC ( 670 HV). 6.3 General Seals:polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE) sheet, glass-fabric reinforced. Seal retainers: corrosion-resistant steel. Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
26、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 14221:1998(E) 3 7 Surface treatment 7.1 All elements manufactured from corrosion-resistant steel which are not cadmium plated or zinc-nickel p
27、lated (code letter C) shall be passivated in accordance with ISO 8075 or cleaned by a mechanical method. 7.2 If made of corrosion-resistant steel, cadmium plating (code letter H) shall be subject to agreement between the customer and the manufacturer. 7.3 Where cadmium plating is specified (code let
28、ters D, M and H), it shall be in accordance with ISO 2082. The external surfaces of bearing rings, except the bore of the inner ring, shall be cadmium plated. Plating on the internal surfaces shall be at the manufacturers option, except the raceways shall not be plated. The thickness of the plating
29、shall not be less than 7 m and not more than 15 m, except plating on the chamfers of the bore may vary from the specified thickness. The bearing shall be embrittlement-relieved within 4 h of plating by heat treatment at 140 C 10 C for a minimum of 8 h followed by chromate treatment in accordance wit
30、h ISO 4520 (code letters D and H only). 7.4 Where zinc-nickel plating is specified (code letter Z), it shall be in accordance with AMS 2417E, type 2. The surface coverage of the plating shall be as specified in 7.3. The thickness of the plating shall not be less than 7 m or more than 15 m. 8 Lubrica
31、tion The bearing shall be prelubricated with either grease A or B, as specified by the customer. NOTE Descriptions of grease A and grease B are given in ISO 14190:1998, annex H. 9 Designation Bearings in accordance by this International Standard shall be designated only as shown in the following exa
32、mple. EXAMPLE where the following codes are applied: greases: A = ester type grease; B = synthetic hydrocarbon type grease; materials/surface treatments: F =material: low alloy bearing steel; surface treatment: none; D = material: low alloy bearing steel; surface treatment: cadmium plated with chrom
33、ate treatment; M = material: low alloy bearing steel; surface treatment: cadmium plated without chromate treatment; Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo
34、 reproduction or networking permitted without license from IHS -,-,- ISO 14221:1998(E) ISO 4 Z =material: low alloy bearing steel; surface treatment: zinc-nickel plated; C = material: corrosion-resistant stainless steel; surface treatment: none; H = material: corrosion-resistant stainless steel; sur
35、face treatment: cadmium plated with chromate treatment. 10 Identification marking In addition to the manufacturers name or trademark, each bearing shall be permanently and legibly marked, using the identity block as defined in clause 9. Marking position and method are at the manufacturers option. 11
36、 Technical specification Airframe ball bearings supplied to this International Standard shall conform to the requirements of ISO 14190. Figure 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resa
37、le, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 14221:1998(E) 5 Table 1 Dimensions in millimetres, tolerances in micrometres Diameter dDBCdmpDmpVBsVCsd1rr1 Mass g code + 3 - 10 + 5 - 15 0 - 64 0 - 64 max.max. 03 04 05 06 4,826 6,35 7,938 9,525
38、 15,875 19,05 20,638 22,225 6,22 7,14 7,54 7,95 5,16 5,56 5,94 6,35 0 - 8 0 - 101313 6,6 8,38 9,91 11,68 0,41 to 0,79 0,13 to 0,51 0,38 to 0,76 0,41 to 0,79 5 9 14 Internal clearances m Radial runout tolerances max. Starting torque Permissible static radial load Permissible static axial load a a Dia
39、meter code RadialAxial m max.CsFa maxmax. GrGa max. KiaKeamNmkNkN 03 04 05 06 3 to 13 584 635 711 762 1320 14,1 21,2 28,2 2,45 4 4,45 4,98 0,45 0,89 10 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not
40、 for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14221:1998(E) ISO 6 Annex A (informative) Imperial unit information Table A.1 gives the Imperial (non-SI) unit information that is the basis for the normative portion of this International
41、Standard. Table A.1 Dimensions in inches, tolerances in 0,000 1 inches Diameter dDBCdmpDmpVBsVCsd1rr1 Mass lb code + 1 - 4 + 2 - 6 0 - 25 0 - 25 max.max. 03 04 05 06 0,19 0,25 0,312 5 0,375 0,625 0,75 0,812 5 0,875 0,245 0,281 0,297 0,313 0,203 0,219 0,234 0,25 0 - 3 0 - 455 0,26 0,33 0,39 0,46 0,01
42、6 to 0,031 0,005 to 0,02 0,015 to 0,03 0,016 to 0,031 0,01 0,02 0,03 Internal clearances 0,000 1 in Radual runout tolerances max. Starting torque Permissible static radial load Permissible static axial load a a Diameter code RadialAxial 0,000 1 in max.CsFa maxmax. GrGa max. KiaKeainozlbflbf 03 04 05
43、 06 1 to 5 230 250 280 300 58 2 3 4 550 900 1 000 1 120 100 200 10 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without l
44、icense from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14221:1998(E) ISO ICS
45、 49.035 Descriptors: aircraft industry, rolling bearings, airframe bearings, ball bearings, single-row bearings, self-aligning bearings, precision bearings, specifications, materials specifications, characteristics, load capacity, dimensions, overall dimensions, lubrication, designation, marking, im
46、perial system, light duty series. Price based on 6 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:28:21 MDTNo reproduction or networking permitted without license from IHS -,-,-