ISO 6336-6-2019 PDF

Full title and description

Calculation of load capacity of spur and helical gears — Part 6: Calculation of service life under variable load (ISO 6336-6:2019). This part of ISO 6336 specifies the information and standardized conditions necessary to calculate the service life—or to determine safety factors for a required life—of spur and helical gears subjected to variable loading, addressing pitting and tooth-root bending strength only.

Abstract

This document provides standardized methods and required input data for estimating gear service life under variable load spectra. It covers the calculation approach for damage accumulation and for deriving safety factors or expected life with respect to pitting (surface fatigue) and tooth-root bending failure modes. It does not replace other parts of ISO 6336 when their scope applies.

General information

• Status: Published (International Standard, confirmed following periodic review).
• Publication date: November 2019 (Edition 2, published 2019-11).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.200 — Gears.
• Edition / version: Edition 2 (2019).
• Number of pages: 37 (ISO published PDF length).

Scope

ISO 6336-6:2019 specifies the information and standardized conditions necessary for calculation of the service life, or safety factors for a required life, of spur and helical gears under variable loading. The methods given address only pitting (surface fatigue) and tooth-root bending strength; if additional failure modes or different conditions apply, refer to other parts of ISO 6336 (for example Part 1 for general principles). The standard establishes input data requirements, load-spectrum treatment and the calculation framework to permit consistent life assessments.

Key topics and requirements

• Calculation methodology for service life under variable (non-constant) loading conditions.
• Definition of standardized input data and boundary conditions required for reproducible life calculations.
• Focus on two failure modes: pitting (surface fatigue) and tooth-root bending strength.
• Procedures for converting variable load histories into damage or equivalent life values.
• Guidance for deriving safety factors corresponding to a specified required life.
• Integration with other parts of the ISO 6336 series for geometry, material and basic strength calculations.

Typical use and users

Engineers and technical specialists in gear design, gearbox and transmission manufacturers, drivetrain system designers, test laboratories, and standards committees commonly use ISO 6336-6 when assessing durability and calculating expected life or safety factors for spur and helical gear sets operating under variable load spectra. It is used during design validation, failure analysis, and when documenting calculation assumptions for procurement or regulatory compliance.

Related standards

ISO 6336-6 is part of the ISO 6336 family on calculation of load capacity of spur and helical gears; related parts include ISO 6336-1 (basic principles), ISO 6336-3 (tooth bending strength), and other parts and technical reports such as ISO/TR 6336-30 (calculation examples). Other related gear standards include ISO 1328 (gear accuracy and flank tolerances) and standards covering gear testing and drawings.

Keywords

ISO 6336-6, gears, spur gears, helical gears, service life, load capacity, variable load, pitting, tooth-root bending strength, safety factor, gear durability.

FAQ

Q: What is this standard?

A: ISO 6336-6:2019 is Part 6 of the ISO 6336 series; it provides the methodology and required data for calculating service life (or safety factors for a required life) of spur and helical gears subjected to variable loading.

Q: What does it cover?

A: It covers calculation procedures for life estimation under variable load spectra with respect to pitting (surface fatigue) and tooth-root bending strength, including the standardized conditions and input information needed to perform consistent calculations. It does not cover other failure modes beyond those two.

Q: Who typically uses it?

A: Gear designers, gearbox manufacturers, mechanical engineers responsible for drivetrain reliability, testing and validation teams, and standards bodies use it to assess durability and set or verify safety factors.

Q: Is it current or superseded?

A: ISO 6336-6:2019 is the current published edition (Edition 2, published November 2019). The ISO record shows this edition was reviewed and confirmed during a subsequent periodic review, and the 2019 edition remains the valid version.

Q: Is it part of a series?

A: Yes. ISO 6336-6 is one part of the multi-part ISO 6336 series on calculation of load capacity of spur and helical gears; other parts address basic principles, geometry, tooth bending strength, surface durability, and calculation examples. Consult the ISO 6336 series for complementary methods and input data requirements.

Q: What are the key keywords?

A: Gears, service life, load capacity, variable load, pitting, tooth-root bending, safety factor, spur gears, helical gears, ISO 6336-6.