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BS ISO 6336-2:2019:2020 Edition

BS ISO 6336-2:2019:2020 Edition

$189.07

Calculation of load capacity of spur and helical gears – Calculation of surface durability (pitting)

Published By Publication Date Number of Pages
BSI 2020 48
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This document specifies the fundamental formulae for use in the determination of the surface load capacity of cylindrical gears with involute external or internal teeth. It includes formulae for all influences on surface durability for which quantitative assessments can be made. It applies primarily to oilā€‘lubricated transmissions, but can also be used to obtain approximate values for (slowā€‘running) greaseā€‘lubricated transmissions, as long as sufficient lubricant is present in the mesh at all times.

The given formulae are valid for cylindrical gears with tooth profiles in accordance with the basic rack standardized in ISO 53. They can also be used for teeth conjugate to other basic racks where the actual transverse contact ratio is less than ĪµĪ±n = 2,5. The results are in good agreement with other methods (see References [5], [7], [10], [12]).

These formulae cannot be directly applied for the assessment of types of gear tooth surface damage such as plastic yielding, scratching, scuffing and so on, other than that described in Clause 4.

The load capacity determined by way of the permissible contact stress is called the ā€œsurface load capacityā€ or ā€œsurface durabilityā€.

If this scope does not apply, refer to ISO 6336ā€‘1:2019, Clause 4.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
11 1 Scope
2 Normative references
12 3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
16 4 Pitting damage and safety factors
17 5 Basic formulae
5.1 General
18 5.2 Safety factor for surface durability (against pitting), SH
5.3 Contact stress, ĻƒH
19 5.4 Permissible contact stress, ĻƒHP
5.4.1 General
20 5.4.2 Determination of permissible contact stress, ĻƒHP ā€” Principles, assumptions and application
5.4.3 Permissible contact stress, ĻƒHP: Method B
21 5.4.4 Permissible contact stress for limited and long life: Method B
23 6 Zone factor, ZH, and contact factors, ZB and ZD
6.1 General
24 6.2 Zone factor, ZH
6.2.1 General
6.2.2 Graphical values
6.2.3 Determination by calculation
6.3 Contact factors, ZB and ZD, for ĪµĪ± ā‰¤ 2
27 6.4 Contact factors, ZB and ZD, for ĪµĪ± > 2
7 Elasticity factor, ZE
28 8 Contact ratio factor, ZĪµ
8.1 General
8.2 Determination of contact ratio factor, ZĪµ
8.2.1 Graphical values
29 8.2.2 Determination by calculation
30 8.3 Calculation of transverse contact ratio, ĪµĪ±, and overlap ratio, ĪµĪ²
8.3.1 Transverse contact ratio, ĪµĪ±
8.3.2 Overlap ratio, ĪµĪ²
31 9 Helix angle factor, ZĪ²
10 Strength for contact stress
10.1 General
10.2 Allowable stress numbers (contact), ĻƒH lim: Method B
32 10.3 Allowable stress number values: Method BR
11 Life factor, ZNT (for flanks)
11.1 General
11.2 Life factor, ZNT: Method A
11.3 Life factor, ZNT: Method B
34 12 Influence of lubricant film, factors ZL, Zv and ZR
12.1 General
12.2 Influence of lubricant film: Method A
12.3 Influence of lubricant film, factors ZL, Zv and ZR: Method B
12.3.1 General
35 12.3.2 Factors ZL, Zv and ZR for reference stress
40 12.3.3 Factors ZL, Zv and ZR for static stress
13 Work hardening factor, ZW
13.1 General
13.2 Work hardening factor, ZW: Method A
41 13.3 Work hardening factor, ZW: Method B
13.3.1 Surface-hardened steel pinion with through-hardened steel gear
43 13.3.2 Through-hardened steel pinion with through-hardened steel gear
44 13.3.3 Surface-hardened steel pinion with ductile iron gear
46 14 Size factor, ZX
47 Bibliography

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BS ISO 6336-2:2019
$189.07