ISO/TS 6336-21:2017
Calculation of load capacity of spur and helical gears — Part 21: Calculation of scuffing load capacity (also applicable to bevel and hypoid gears) — Integral temperature method
ISO/TS 6336-21:2017 specifies the integral temperature method for calculating the scuffing load capacity of cylindrical, bevel and hypoid gears.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
3.1 Terms and definitions
3.2 Symbols and units
4 Field of application
4.1 General
4.2 Scuffing damage
4.3 Integral temperature criterion
5 Influence factors
5.1 Mean coefficient of friction, μmC
5.2 Run-in factor, XE
5.3 Thermal flash factor, XM
5.4 Pressure angle factor, Xαβ
6 Calculation
6.1 Cylindrical gears
6.1.1 General
6.1.2 Scuffing safety factor, SintS
6.1.3 Permissible integral temperature, ϑintP
6.1.4 Integral temperature, ϑint
6.1.5 Flash temperature at pinion tooth tip, ϑflaE
6.1.6 Bulk temperature, ϑM
6.1.7 Mean coefficient of friction, μmC
6.1.8 Run-in factor, XE
6.1.9 Thermal flash factor, XM
6.1.10 Pressure angle factor, Xαβ
6.1.11 Geometry factor at tip of pinion, XBE
6.1.12 Approach factor, XQ
6.1.13 Tip relief factor, XCa
6.1.14 Contact ratio factor, Xε
6.2 Bevel gears
6.2.1 General
6.2.2 Scuffing safety factor, SintS
6.2.3 Permissible integral temperature , ϑintP
6.2.4 Permissible integral temperature, ϑintP
6.2.5 Flash temperature at pinion tooth tip, ϑflaE
6.2.6 Bulk temperature, ϑM
6.2.7 Mean coefficient of friction, μmC
6.2.8 Run-in factor, XE
6.2.9 Thermal flash factor, XM
6.2.10 Pressure angle factor, Xαβ
6.2.11 Geometry factor at tip of pinion, XBE
6.2.12 Approach factor, XQ
6.2.13 Tip relief factor, XCa
6.2.14 Contact ratio factor, Xε
6.3 Hypoid gears
6.3.1 General
6.3.2 Scuffing safety factor, SintS
6.3.3 Permissible integral temperature, ϑintP
6.3.4 Integral temperature, ϑnt
6.3.5 Bulk temperature, ϑM
6.3.6 Mean coefficient of friction, μmC
6.3.7 Run-in factor, XE
6.3.8 Geometry factor, XG
6.3.9 Approach factor, XQ
6.3.10 Tip relief factor, XCa
6.3.11 Contact ratio factor, Xε
6.3.12 Calculation of virtual crossed axes helical gears
6.4 Scuffing integral temperature
6.4.1 General
6.4.2 Scuffing integral temperature, ϑintS
6.4.3 Relative welding factor, XWrelT
Annex A (informative) Examples
Annex B (informative) Contact-time-dependent scuffing temperature
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
3.1 Terms and definitions
3.2 Symbols and units
4 Field of application
4.1 General
4.2 Scuffing damage
4.3 Integral temperature criterion
5 Influence factors
5.1 Mean coefficient of friction, μmC
5.2 Run-in factor, XE
5.3 Thermal flash factor, XM
5.4 Pressure angle factor, Xαβ
6 Calculation
6.1 Cylindrical gears
6.1.1 General
6.1.2 Scuffing safety factor, SintS
6.1.3 Permissible integral temperature, ϑintP
6.1.4 Integral temperature, ϑint
6.1.5 Flash temperature at pinion tooth tip, ϑflaE
6.1.6 Bulk temperature, ϑM
6.1.7 Mean coefficient of friction, μmC
6.1.8 Run-in factor, XE
6.1.9 Thermal flash factor, XM
6.1.10 Pressure angle factor, Xαβ
6.1.11 Geometry factor at tip of pinion, XBE
6.1.12 Approach factor, XQ
6.1.13 Tip relief factor, XCa
6.1.14 Contact ratio factor, Xε
6.2 Bevel gears
6.2.1 General
6.2.2 Scuffing safety factor, SintS
6.2.3 Permissible integral temperature , ϑintP
6.2.4 Permissible integral temperature, ϑintP
6.2.5 Flash temperature at pinion tooth tip, ϑflaE
6.2.6 Bulk temperature, ϑM
6.2.7 Mean coefficient of friction, μmC
6.2.8 Run-in factor, XE
6.2.9 Thermal flash factor, XM
6.2.10 Pressure angle factor, Xαβ
6.2.11 Geometry factor at tip of pinion, XBE
6.2.12 Approach factor, XQ
6.2.13 Tip relief factor, XCa
6.2.14 Contact ratio factor, Xε
6.3 Hypoid gears
6.3.1 General
6.3.2 Scuffing safety factor, SintS
6.3.3 Permissible integral temperature, ϑintP
6.3.4 Integral temperature, ϑnt
6.3.5 Bulk temperature, ϑM
6.3.6 Mean coefficient of friction, μmC
6.3.7 Run-in factor, XE
6.3.8 Geometry factor, XG
6.3.9 Approach factor, XQ
6.3.10 Tip relief factor, XCa
6.3.11 Contact ratio factor, Xε
6.3.12 Calculation of virtual crossed axes helical gears
6.4 Scuffing integral temperature
6.4.1 General
6.4.2 Scuffing integral temperature, ϑintS
6.4.3 Relative welding factor, XWrelT
Annex A (informative) Examples
Annex B (informative) Contact-time-dependent scuffing temperature
Bibliography