BS ISO 6336-6-2019 PDF

Full title and description

STB BS ISO 6336-6:2019 — Calculation of load capacity of spur and helical gears — Part 6: Calculation of service life under variable load. This entry refers to the British adoption (BS ISO) of the ISO 6336‑6:2019 international standard and describes standardized methods for predicting gear service life under variable loading, with focus on pitting (surface durability) and tooth‑root bending strength.

Abstract

This document specifies the information and standardized conditions necessary for the calculation of the service life (or the safety factors for a required life) of spur and helical gears that are subject to variable loads. The procedures are limited to pitting (surface fatigue) and tooth‑root bending fatigue; users are referred to ISO 6336‑1:2019 for general principles when the scope does not apply.

General information

• Status: Published (BS adoption of ISO 6336‑6:2019; international edition confirmed).
• Publication date: 28 November 2019 (BS adoption) / 26 November 2019 (ISO publication record).
• Publisher: British Standards Institution (BSI) — identical to ISO 6336‑6:2019 (ISO as originator).
• ICS / categories: 21.200 — Gears.
• Edition / version: Edition 2 (2019).
• Number of pages: 46 (BSI published version; ISO edition reference indicates 37 pages for the ISO document itself — national adoption typically includes national foreword/cover pages).

Scope

The standard provides the data, assumptions and calculation procedures required to determine the service life (or corresponding safety factors) of cylindrical spur and helical gears under variable loading. It addresses only pitting and tooth‑root bending strength. For topics and influence factors outside this scope, ISO 6336‑1:2019 should be consulted. The standard is intended for use where cumulative damage from variable cycles must be quantified to predict fatigue life.

Key topics and requirements

• Calculation methods for gear service life under variable (non‑constant) load histories, including cycle counting and damage accumulation approaches.
• Assessment of pitting (surface durability) and tooth‑root bending fatigue as the primary failure modes considered.
• Standardized loading conditions, material and surface condition factors, and safety factor determination for required life.
• Guidance on equivalent cumulative damage (integration of damage from varying stress levels) and worked examples in informative annexes.
• Normative references and cross‑links to other parts of the ISO 6336 series (parts 1, 2, 3, 5, and related technical reports) required to apply the methods correctly.

Typical use and users

Used by gear designers, mechanical engineers, manufacturers and quality engineers in industries such as automotive, heavy machinery, wind and power generation, rail, marine and industrial gear manufacturing. Typical uses include design verification, life‑prediction during development, failure investigation and specifying safety factors for products expected to see variable service loads.

Related standards

ISO 6336 is a multipart series — see especially ISO 6336‑1 (basic principles), ISO 6336‑2 (surface durability/pitting), ISO 6336‑3 (tooth bending strength) and ISO/TR 6336‑30 (calculation examples). Other technical specifications and reports in the 6336 family (for specific applications and additional calculation methods) are commonly used together with part 6.

Keywords

gear calculation, service life, variable load, pitting, tooth‑root bending, cumulative damage, spur gears, helical gears, ISO 6336, BS ISO, gear fatigue, load capacity

FAQ

Q: What is this standard?

A: BS ISO 6336‑6:2019 is the British adoption of ISO 6336‑6:2019, Part 6 of the ISO 6336 series — a technical standard for calculating the service life of spur and helical gears under variable loading, focused on pitting and tooth‑root bending strength.

Q: What does it cover?

A: It covers the information, assumptions and calculation procedures needed to predict gear fatigue life under variable load histories and to determine safety factors for a required life; it is limited to pitting and tooth‑root bending failure modes.

Q: Who typically uses it?

A: Gear designers, mechanical and reliability engineers, manufacturers and testing/validation teams across automotive, industrial, power generation, rail, marine and related sectors — anyone needing standardized life‑prediction for gears under variable service loads.

Q: Is it current or superseded?

A: ISO 6336‑6:2019 (Edition 2, 2019) is the current international edition; the 2019 edition replaced the 2006 edition. National adoptions such as BS ISO 6336‑6:2019 reflect that 2019 edition. The ISO record indicates periodic review and confirmation of the edition.

Q: Is it part of a series?

A: Yes — it is part 6 of the multipart ISO 6336 series (calculation of load capacity of spur and helical gears). Parts 1, 2 and 3 (and supporting technical reports) are commonly used together to perform complete gear strength and life assessments.

Q: What are the key keywords?

A: Service life, variable load, pitting, tooth‑root bending, cumulative damage, spur gears, helical gears, load capacity, ISO 6336.