ISO 10300-1:2023
(Main)Calculation of load capacity of bevel gears — Part 1: Introduction and general influence factors
Calculation of load capacity of bevel gears — Part 1: Introduction and general influence factors
This document specifies the methods of calculation of the load capacity of bevel gears, the formulae and symbols used for calculation, and the general factors influencing load conditions. The formulae in this document are intended to establish uniformly acceptable methods for calculating the load-carrying capacity of straight, helical (skew), spiral bevel, Zerol and hypoid gears. They are applicable equally to tapered depth and uniform depth teeth. Hereinafter, the term “bevel gear” refers to all of the gear types; if not, the specific forms are identified. The formulae in this document take into account the known major factors influencing load-carrying capacity. The rating formulae are only applicable to types of gear tooth deterioration, that are specifically addressed in the individual parts of the ISO 10300 series. Rating systems for a particular type of bevel gears can be established by selecting proper values for the factors used in the general formulae. NOTE This document is not applicable to bevel gears which have an inadequate contact pattern under load (see Annex D). The rating system of this document is based on virtual cylindrical gears and restricted to bevel gears whose virtual cylindrical gears have transverse contact ratios of εvα The user is cautioned that when the formulae are used for large average mean spiral angles (βm1 + βm2)/2 > 45°, for effective pressure angles αe > 30° and/or for large facewidths b > 13 mmn, the calculated results of this document should be confirmed by experience.
Calcul de la capacité de charge des engrenages coniques — Partie 1: Introduction et facteurs généraux d'influence
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 10300-1
Third edition
2023-08
Calculation of load capacity of bevel
gears —
Part 1:
Introduction and general influence
factors
Calcul de la capacité de charge des engrenages coniques —
Partie 1: Introduction et facteurs généraux d'influence
Reference number
© ISO 2023
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ii
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and general subscripts . .2
5 Application .6
5.1 Calculation methods . 6
5.1.1 General . 6
5.1.2 Method A . . . 6
5.1.3 Method B . . 6
5.1.4 Method C . 6
5.2 Safety factors . 7
5.3 Rating factors . 7
5.3.1 Testing . 7
5.3.2 Manufacturing tolerances . 7
5.3.3 Implied accuracy . 8
5.4 Further factors to be considered . 8
5.4.1 General . 8
5.4.2 Lubrication . 8
5.4.3 Misalignment . 8
5.4.4 Deflection . . 8
5.4.5 Materials and metallurgy . 8
5.4.6 Residual stress . 8
5.4.7 System dynamics . 9
5.4.8 Contact pattern . 9
5.4.9 Corrosion . 9
5.5 Further influence factors in the basic formulae . 9
6 External force and application factor, K .10
A
6.1 Nominal tangential force, torque, power . 10
6.2 Variable load conditions . 10
6.3 Application factor, K . 10
A
6.3.1 Application factor — General . . 10
6.3.2 Influences affecting external dynamic loads . 11
6.3.3 Establishment of application factors . 11
7 Dynamic factor, K .11
v
7.1 General . 11
7.2 Design . 11
7.3 Manufacturing .12
7.4 Transmission error .12
7.5 Dynamic response . 12
7.6 Resonance . 13
7.6.1 General .13
7.6.2 Gear blank resonance . . .13
7.7 Calculation methods for K .13
v
7.7.1 General comments .13
7.7.2 Method A, K . 14
v-A
7.7.3 Method B, K . 14
v-B
7.7.4 Method C, K . 18
v-C
8 Face load factors, K , K .20
Hβ Fβ
8.1 General comments .20
iii
8.2 Method A . 20
8.3 Method B . 21
8.4 Method C . 21
8.4.1 Face load factor, K . 21
Hβ-C
8.4.2 Local face load factor, K . 21
Hβ,Y
8.4.3 Face load factor, K . 22
Fβ-C
8.4.4 Lengthwise curvature factor for bending strength, K . .22
F0
9 Transverse load factors, K , K .23
Hα Fα
9.1 General comments .23
9.2 Method A . 24
9.3 Method B . 24
9.3.1 Bevel gears having virtual cylindrical gears with contact ratio ε ≤ 2. 24
vγ
9.3.2 Bevel gears having virtual cylindrical gears with contact ratio ε > 2 . 24
vγ
9.4 Method C . 25
9.4.1 General comments .25
9.4.2 Assumptions . 25
9.4.3 Determination of the factors . 25
9.5 Running-in allowance, y .25
α
Annex A (normative) Calculation of virtual cylindrical gears — Method B1.27
Annex B (normative) Calculation of virtual cylindrical gears — Method B2 .43
Annex C (informative) Values for application factor, K .49
A
Annex D (informative) Contact patterns .
...
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