ISO 10300-2:2023
Calculation of load capacity of bevel gears — Part 2: Calculation of surface durability (macropitting)
Calculation of load capacity of bevel gears — Part 2: Calculation of surface durability (macropitting)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 35
- Дата публикации:
- 24 августа 2023 г.
- Издание:
- ISO IS 10300 edition 3 version 1
- ICS:
- 21.200
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.
Abstract
Overview - ISO 10300-2:2023 (Bevel gears, macropitting)
ISO 10300-2:2023, "Calculation of load capacity of bevel gears - Part 2: Calculation of surface durability (macropitting)," defines standardized methods to evaluate the surface durability (macropitting) and load-carrying capacity of bevel gears. It covers straight, helical (skew), spiral, Zerol and hypoid bevel gears with tapered or uniform depth teeth. The standard specifies contact stress and permissible stress assessments, rating procedures (Methods B1 and B2), and the main factors that influence macropitting under lubricated conditions.
Key topics and technical requirements
- Macropitting types and assessment: Distinguishes initial versus destructive macropitting and outlines acceptability and assessment requirements for surface fatigue.
- Gear flank rating formulae: Two principal methods are provided:
- Method B1 (original Method B) - uses an inscribed parallelogram approach for load distribution.
- Method B2 - introduces an inscribed ellipse approach, extended for hypoid gears.
- Contact stress evaluation: Hertz-based contact stress fundamentals adapted for bevel gear contact geometry and elliptical pressure zones.
- Permissible contact stress and safety factors: Procedures to compute permissible stresses and safety margins considering life, material and operating conditions.
- Load and geometry influence factors: Includes mid‑zone and load‑sharing factors, facewidth and geometry factors, bevel-gear specific factors, size and hypoid factors.
- Tribology and material factors: Elasticity, lubricant-film influence, roughness, work hardening and life factors are incorporated (Z-factors) to adjust ratings based on lubrication, surface finish and heat treatment.
- Limitations and cautions: Not applicable to gears with inadequate contact patterns; users are cautioned when average spiral angles exceed 45°, effective pressure angles exceed 30°, or facewidths exceed 13 mm - in these cases results should be validated by experience or tests.
Practical applications and users
ISO 10300-2:2023 is intended for:
- Gear designers and gearbox engineers performing load-capacity and surface-durability calculations.
- Manufacturers specifying material, heat treatment and surface finish to avoid destructive macropitting.
- Tribologists and lubrication engineers evaluating lubricant film effects on gear life.
- Test laboratories and quality/standards bodies conducting gear rating, validation and certification. Practical uses include gearbox design, failure-risk assessment, life prediction, specification of inspection criteria and transfer of test data across gear types and sizes.
Related standards
- ISO 10300-1 (general principles for bevel gear rating)
- Other parts of the ISO 10300 series and ISO 6336-5 (cylindrical gear methods)
- ISO/TR 22849 (additional background on macropitting)
Keywords: ISO 10300-2:2023, bevel gears, macropitting, surface durability, load capacity, contact stress, gear design, hypoid gears.
Технические детали
- Технический комитет
- ISO/TC 60/SC 2 - Gear capacity calculation
- SKU
- ISO 10300-2:2023
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BS ISO 10300-1:2023
ДействующийCalculation of load capacity of bevel gears. Introduction and general influence factors.
BS ISO 10300-2:2023
ДействующийCalculation of load capacity of bevel gears. Calculation of surface durability (macropitting).
ISO 6336-5:2016
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ISO/TR 22849:2011
ДействующийDesign recommendations for bevel gears
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