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1、 Reference number ISO 76:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 76 Third edition 2006-05-01 Rolling bearings Static load ratings Roulements Charges statiques de base ISO 76:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file
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4、 the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in a
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6、49 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved -,-,- ISO 76:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Symbols. 3 5 Radial ball bearing
7、s 4 5.1 Basic static radial load rating 4 5.2 Static equivalent radial load 6 6 Thrust ball bearings 7 6.1 Basic static axial load rating . 7 6.2 Static equivalent axial load 7 7 Radial roller bearings. 7 7.1 Basic static radial load rating 7 7.2 Static equivalent radial load 8 8 Thrust roller beari
8、ngs. 9 8.1 Basic static axial load rating . 9 8.2 Static equivalent axial load 9 9 Static safety factor 10 9.1 General. 10 9.2 Ball bearings . 10 9.3 Roller bearings 11 Annex A (informative) Discontinuities in the calculation of basic static load ratings 12 -,-,- ISO 76:2006(E) iv ISO 2006 All right
9、s reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject fo
10、r which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on
11、all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees ar
12、e circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held r
13、esponsible for identifying any or all such patent rights. ISO 76 was prepared by Technical Committee ISO/TC 4, Rolling bearings, Subcommittee SC 8, Load ratings and life. This third edition cancels and replaces the second edition (ISO 76:1987), which has been technically revised. It incorporates ISO
14、 76:1987/Amd 1:1999 in Annex A. -,-,- ISO 76:2006(E) ISO 2006 All rights reserved v Introduction Permanent deformations appear in rolling elements and raceways of rolling bearings under static loads of moderate magnitude and increase gradually with increasing load. It is often impractical to establi
15、sh whether the deformations appearing in a bearing in a specific application are permissible by testing the bearing in that application. Other methods are therefore required to establish the suitability of the bearing selected. Experience shows that a total permanent deformation of 0,000 1 of the ro
16、lling element diameter, at the centre of the most heavily loaded rolling element/raceway contact, can be tolerated in most bearing applications without the subsequent bearing operation being impaired. The basic static load rating is, therefore, given a magnitude such that, approximately, this deform
17、ation occurs when the static equivalent load is equal to the load rating. Tests in different countries indicate that a load of the magnitude in question can be considered to correspond to a calculated contact stress of 4 600 MPa1) for self-aligning ball bearings, 4 200 MPa for all other ball bearing
18、s, and 4 000 MPa for all roller bearings, at the centre of the most heavily loaded rolling element/raceway contact. The equations and factors for the calculation of the basic static load ratings are based on these contact stresses. The permissible static equivalent load could be smaller than, equal
19、to or greater than the basic static load rating, depending on the requirements for smoothness of operation and friction, as well as on actual contact surface geometry. Bearing users without previous experience of these conditions will need to consult the bearing manufacturer. 1) 1 bar = 0,1 MPa = 10
20、5 Pa; 1 MPa = 1 N/mm2 -,-,- -,-,- INTERNATIONAL STANDARD ISO 76:2006(E) ISO 2006 All rights reserved 1 Rolling bearings Static load ratings 1 Scope This International Standard specifies methods of calculating the basic static load rating and the static equivalent load for rolling bearings within the
21、 size ranges shown in the relevant ISO standards, manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of conventional design as regards the shape of the rolling contact surfaces. Calculations carried out in
22、accordance with this International Standard do not yield satisfactory results for bearings in which, because of application conditions and/or internal design, there is a considerable truncation of the area of contact between the rolling elements and the ring raceways. The same limitation applies whe
23、re application conditions cause deviations from a normal load distribution in the bearing, for example misalignment, preload or extra large clearance or where special surface treatment or coatings are used. Where there is reason to assume that such conditions prevail, the user should consult the bea
24、ring manufacturer for recommendations and the evaluation of the static equivalent load. This International Standard is not applicable to designs where the rolling elements operate directly on a shaft or housing surface, unless that surface is equivalent in all respects to the bearing surface it repl
25、aces. Double-row radial bearings and double-direction thrust bearings are, when referred to in this International Standard, presumed to be symmetrical. In addition, guidelines are given for static safety factors to be applied in heavy loaded applications. 2 Normative references The following referen
26、ced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5593, Rolling bearings Vocabulary ISO 15241, Rolling bearings Symb
27、ols for quantities ISO/TR 10657:1991, Explanatory notes on ISO 76 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5593 and the following apply. 3.1 static load load acting on a bearing when the speed of rotation of its rings or washers in relation to
28、 each other is zero -,-,- ISO 76:2006(E) 2 ISO 2006 All rights reserved 3.2 basic static radial load rating radial load which corresponds to a calculated contact stress at the centre of the most heavily loaded rolling element/raceway contact of 4 600 MPa for self-aligning ball bearings, 4 200 MPa fo
29、r all other radial ball bearings types, and 4 000 MPa for all radial roller bearings NOTE 1 In the case of a single-row angular contact bearing, the radial load rating refers to the radial component of that load which causes a purely radial displacement of the bearing rings in relation to each other
30、. NOTE 2 For these contact stresses, under static load, a total permanent deformation of rolling element and raceway occurs which is approximately 0,000 1 of the rolling element diameter. 3.3 basic static axial load rating static centric axial load which corresponds to a calculated contact stress at
31、 the centre of the most heavily loaded rolling element/raceway contact of 4 200 MPa for thrust ball bearings, and 4 000 MPa for all thrust roller bearings NOTE For these contact stresses, under static load, a total permanent deformation of rolling element and raceway occurs which is approximately 0,
32、000 1 of the rolling element diameter. 3.4 static equivalent radial load static radial load which would cause the same contact stress at the centre of the most heavily loaded rolling element/raceway contact as that which occurs under the actual load conditions 3.5 static equivalent axial load static
33、 centric axial load which would cause the same contact stress at the centre of the most heavily loaded rolling element/raceway contact as that which occurs under the actual load conditions 3.6 static safety factor ratio between the basic static load rating and the static equivalent load, giving a ma
34、rgin of safety against inadmissible permanent deformation on rolling elements and raceways 3.7 roller diameter calculation of load ratings theoretical diameter in a radial plane through the middle of the roller length for a symmetrical roller NOTE 1 For a tapered roller, the applicable diameter is e
35、qual to the mean value of the diameters at the imaginary sharp corners at the large end and at the small end of the roller. NOTE 2 For an asymmetrical convex roller, the applicable diameter is an approximation of the diameter at the point of contact between the roller and the ribless raceway at zero
36、 load. 3.8 effective roller length calculation of load ratings theoretical maximum length of contact between a roller and that raceway where the contact is shortest -,-,- ISO 76:2006(E) ISO 2006 All rights reserved 3 NOTE This is normally taken to be either the distance between the theoretically sha
37、rp corners of the roller minus the roller chamfers, or the raceway width excluding the grinding undercuts, whichever is the smaller. 3.9 nominal contact angle angle between a plane perpendicular to a bearing axis (a radial plane) and the nominal line of action of the resultant of the forces transmit
38、ted by a bearing ring or washer to a rolling element NOTE For bearings with asymmetrical rollers, the nominal contact angle is determined by the contact with the ribless raceway. 3.10 pitch diameter of ball set diameter of the circle containing the centres of the balls in one row in a bearing 3.11 p
39、itch diameter of roller set diameter of the circle intersecting the roller axes at the middle of the rollers in one row in a bearing 4 Symbols For the purposes of this document, the symbols given in ISO 15241 and the following apply. C0a basic static axial load rating, in newtons C0r basic static ra
40、dial load rating, in newtons Dpw pitch diameter of ball or roller set, in millimetres Dw nominal ball diameter, in millimetres Dwe roller diameter applicable in the calculation of load ratings, in millimetres Fa bearing axial load (axial component of actual bearing load), in newtons Fr bearing radia
41、l load (radial component of actual bearing load), in newtons f0 factor for calculation of basic static load rating i number of rows of rolling elements Lwe effective roller length applicable in the calculation of load ratings, in millimetres P0a static equivalent axial load, in newtons P0r static eq
42、uivalent radial load, in newtons S0 static safety factor X0 static radial load factor Y0 static axial load factor Z number of rolling elements in a single-row bearing; number of rolling elements per row of a multi-row bearing with the same number of rolling elements per row nominal contact angle, in
43、 degrees -,-,- ISO 76:2006(E) 4 ISO 2006 All rights reserved 5 Radial ball bearings 5.1 Basic static radial load rating 5.1.1 Basic static radial load rating for single bearings The basic static radial load rating for radial ball bearings is given by the equation: C0r = f0 i Z Dw2 cos (1) where the
44、values of f0 are as given in Table 1. The equation applies to bearings with a cross-sectional raceway groove radius not larger than 0,52Dw in radial and angular contact ball bearing inner rings, and 0,53Dw in radial and angular contact ball bearing outer rings and self-aligning ball bearing inner ri
45、ngs. The load-carrying ability of a bearing is not necessarily increased by the use of a smaller groove radius, but is reduced by the use of a groove radius larger than those indicated in the previous paragraph. In the latter case, a correspondingly reduced value of f0 shall be used. Calculation of
46、this reduced value of f0 may be carried out by means of Equation (3-18) given in ISO/TR 10657:1991. 5.1.2 Basic static radial load rating for bearing combinations 5.1.2.1 Two single-row radial contact ball bearings operation as a unit The basic static radial load rating for two similar single-row ra
47、dial contact ball bearings mounted side by side on the same shaft, such that they operate as a unit (paired mounting), is twice the basic static radial load rating of one single-row bearing. 5.1.2.2 Back-to-back and face-to-face arrangements of single-row angular contact ball bearings The basic stat
48、ic radial load rating for two similar single-row angular contact ball bearings mounted side by side on the same shaft, such that they operate as a unit (paired mounting) in a back-to-back or face-to-face arrangement, is twice the basic static radial load rating of one single-row bearing. 5.1.2.3 Tandem arrangement The basic static radial load rating for two or more similar single-row radial contact ball bearings or two or more similar single-row angular contact ball b