NF ISO 76
Rolling bearings - Static load ratings
ISO 76:2006 specifies methods of calculating the basic static load rating and the static equivalent load for rolling bearings within the 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 accordance with ISO 76:2006 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 where 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 bearing manufacturer for recommendations and the evaluation of the static equivalent load.ISO 76:2006 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 replaces.Double-row radial bearings and double-direction thrust bearings are, when referred to in ISO 76:2006, presumed to be symmetrical.In addition, guidelines are given for static safety factors to be applied in heavy loaded applications.
ISO 76:2006 specifies methods of calculating the basic static load rating and the static equivalent load for rolling bearings within the 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 accordance with ISO 76:2006 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 where 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 bearing manufacturer for recommendations and the evaluation of the static equivalent load.
ISO 76:2006 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 replaces.
Double-row radial bearings and double-direction thrust bearings are, when referred to in ISO 76:2006, presumed to be symmetrical.
In addition, guidelines are given for static safety factors to be applied in heavy loaded applications.
Le présent document spécifie des méthodes de calcul de la charge statique de base et de la charge statique équivalente des roulements, dans les gammes de dimensions présentées dans les normes ISO correspondantes.
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions1
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4 Symboles3
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5 Roulements à billes radiaux4
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5.1 Charge radiale statique de base4
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5.2 Charge radiale statique équivalente6
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6 Butées à billes7
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6.1 Charge axiale statique de base7
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6.2 Charge axiale statique équivalente7
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7 Roulements à rouleaux radiaux7
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7.1 Charge radiale statique de base7
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7.2 Charge radiale statique équivalente8
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8 Butées à rouleaux9
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8.1 Charge axiale statique de base9
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8.2 Charge axiale statique équivalente9
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9 Facteur de sécurité statique10
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9.1 Généralités10
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9.2 Roulements à billes10
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9.3 Roulements à rouleaux11
- Annexe A (informative) Discontinuités dans le calcul des charges statiques de base12
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