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BS ISO 6336-1:2019 Calculation of load capacity of spur and helical gears - Basic principles, introduction and general influence factors, 2019
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviated terms
- 3.1 Terms and definitions
- 3.2 Symbols and abbreviated terms
- 4 Basic principles
- 4.1 Application
- 4.1.1 Surface durability (pitting)
- 4.1.2 Tooth bending strength
- 4.1.3 Tooth flank fracture
- 4.1.4 Strength and quality of materials
- 4.1.5 Service life under variable load
- 4.1.6 Scuffing
- 4.1.7 Wear
- 4.1.8 Micropitting
- 4.1.9 Plastic-yielding
- 4.1.10 Specific applications
- 4.1.11 Safety factors
- 4.1.12 Testing
- 4.1.13 Manufacturing tolerances
- 4.1.14 Implied accuracy
- 4.1.15 Other considerations
- 4.1.16 Influence factors
- 4.1.17 Numerical formulae
- 4.1.18 Succession of factors in the course of calculation
- 4.1.19 Determination of allowable values of gear deviations
- 4.2 Tangential load, torque and power
- 4.2.1 General
- 4.2.2 Nominal tangential load, nominal torque and nominal power
- 4.2.3 Equivalent tangential load, equivalent torque and equivalent power
- 4.2.4 Maximum tangential load, maximum torque and maximal power
- 5 Application factor, KA
- 5.1 General
- 5.2 Method A — Factor KA-A
- 5.2.1 Factor KA-A
- 5.2.2 Factor KHA-A for pitting along ISO 6336-2
- 5.2.3 Factor KFA-A for tooth root breakage along ISO 6336-3
- 5.2.4 Factor KFFA-A for tooth flank fracture along ISO/TS 6336-4
- 5.2.5 Factor KϑA-A for scuffing along ISO/TS 6336-20/ISO/TS 6336-21
- 5.2.6 Factor KλA-A for micropitting along ISO/TS 6336-22
- 5.3 Method B — Factor KA-B
- 5.3.1 General
- 5.3.2 Guide values for application factor, KA-B
- 6 Internal dynamic factor, Kv
- 6.1 General
- 6.2 Parameters affecting internal dynamic load and calculations
- 6.2.1 Design
- 6.2.2 Manufacturing
- 6.2.3 Transmission perturbance
- 6.2.4 Dynamic response
- 6.2.5 Resonances
- 6.2.6 Application of internal dynamic factor for low loaded gears
- 6.3 Principles and assumptions
- 6.4 Methods for determination of dynamic factor
- 6.4.1 Method A — Factor Kv-A
- 6.4.2 Method B — Factor Kv-B
- 6.4.3 Method C — Factor Kv-C
- 6.5 Determination of dynamic factor using Method B: Kv-B
- 6.5.1 General
- 6.5.2 Running speed ranges
- 6.5.3 Determination of resonance running speed (main resonance) of a gear pair
- 6.5.4 Dynamic factor in subcritical range (N ≤ NS)
- 6.5.5 Dynamic factor in main resonance range (NS < N ≤ 1,15)
- 6.5.6 Dynamic factor in supercritical range (N ≥ 1,5)
- 6.5.7 Dynamic factor in intermediate range (1,15 < N < 1,5)
- 6.5.8 Resonance speed determination for specific gear designs
- 6.5.9 Calculation of reduced mass of gear pair with external teeth
- 6.6 Determination of dynamic factor using Method C: Kv-C
- 6.6.1 General
- 6.6.2 Graphical values of dynamic factor using Method C
- 6.6.3 Determination by calculation of dynamic factor using Method C
- 7 Face load factors, KHβ and KFβ
- 7.1 Gear tooth load distribution
- 7.2 General principles for determination of face load factors, KHβ and KFβ
- 7.2.1 General
- 7.2.2 Face load factor for contact stress, KHβ
- 7.2.3 Face load factor for tooth root stress, KFβ
- 7.3 Methods for determination of face load factor — Principles, assumptions
- 7.3.1 General
- 7.3.2 Method A — Factors KHβ-A and KFβ-A
- 7.3.3 Method B — Factors KHβ-B and KFβ-B
- 7.3.4 Method C — Factors KHβ-C and KFβ-C
- 7.4 Determination of face load factor using Method B: KHβ-B
- 7.4.1 Number of calculation points
- 7.4.2 Definition of KHβ
- 7.4.3 Stiffness and elastic deformations
- 7.4.4 Static displacements
- 7.4.5 Assumptions
- 7.4.6 Computer program output
- 7.5 Determination of face load factor using Method C: KHβ-C
- 7.5.1 General
- 7.5.2 Effective equivalent misalignment, Fβy
- 7.5.3 Running-in allowance, yβ, and running-in factor, χβ
- 7.5.4 Mesh misalignment, fma
- 7.5.5 Component of mesh misalignment caused by case deformation, fca
- 7.5.6 Component of mesh misalignment caused by shaft displacement, fbe
- 7.6 Determination of face load factor for tooth root stress using Method B or C: KFβ
- 8 Transverse load factors KHα and KFα
- 8.1 Transverse load distribution
- 8.2 Determination methods for transverse load factors — Principles and assumptions
- 8.2.1 General
- 8.2.2 Method A — Factors KHα-A and KFα-A
- 8.2.3 Method B — Factors KHα-B and KFα-B
- 8.3 Determination of transverse load factors using Method B — KHα-B and KFα-B
- 8.3.1 General
- 8.3.2 Determination of transverse load factor by calculation
- 8.3.3 Transverse load factors from graphs
- 8.3.4 Limiting conditions for KHα
- 8.3.5 Limiting conditions for KFα
- 8.3.6 Running-in allowance, yα
- 9 Tooth stiffness parameters, c′ and cγ
- 9.1 Stiffness influences
- 9.2 Determination methods for tooth stiffness parameters — Principles and assumptions
- 9.2.1 General
- 9.2.2 Method A — Tooth stiffness parameters c′A and cγ-A
- 9.2.3 Method B — Tooth stiffness parameters c′B and cγ-B
- 9.3 Determination of tooth stiffness parameters, c′ and cγ, according to Method B
- 9.3.1 General
- 9.3.2 Single stiffness, c′
- 9.3.3 Mesh stiffness, cγ
- 10 Parameter of Hertzian contact
- 10.1 Local radius of relative curvature
- 10.2 Reduced modulus of elasticity, Er
- 10.3 Local Hertzian contact stress, pdyn,CP
- 10.3.1 Method A
- 10.3.2 Method B
- 10.4 Half of the Hertzian contact width, bH
- 10.5 Load distribution along the path of contact
- 10.5.1 Definition of contact points, CP, on the path of contact
- 10.5.2 Load sharing factor, XCP
- 10.6 Sum of tangential velocity, vΣ,CP
- 11 Lubricant parameters at given temperature
- 11.1 General
- 11.2 Kinematic viscosity at a given temperature, vθ
- 11.3 Density of the lubricant at a given temperature θ, ρθ
- Annex A (normative) Additional methods for determination of fsh and fma
- Annex B (informative) Guide values for crowning and end relief of teeth of cylindrical gears
- Annex C (informative) Guide values for KHβ-C for crowned teeth of cylindrical gears
- Annex D (informative) Derivations and explanatory notes
- Annex E (informative) Analytical determination of load distribution
- Annex F (informative) General symbols used for calculation of load capacity of spur and helical gears
- Bibliography [Go to Page]