ISO/TR 6336-31:2018 平歯車とはすば歯車の負荷容量の計算—パート31：マイクロピッチング負荷容量の計算例 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 60, Gears, Subcommittee SC 2, Gear capacity calculation.

This document cancels and replaces ISO/TR 15144-2:2014.

Introduction

The ISO 6336 series consists of International Standards, Technical Specifications (TS) and Technical Reports (TR) under the general title Calculation of load capacity of spur and helical gears (see Table 1).

• International Standards contain calculation methods that are based on widely accepted practices and have been validated.
• TS contain calculation methods that are still subject to further development.
• TR contain data that is informative, such as example calculations.

The procedures specified in ISO 6336-1 to ISO 6336-19 cover fatigue analyses for gear rating. The procedures described in ISO 6336-20 to ISO 6336-29 are predominantly related to the tribological behaviour of the lubricated flank surface contact. ISO 6336-30 to ISO 6336-39 include example calculations. The ISO 6336 series allows the addition of new parts under appropriate numbers to reflect knowledge gained in the future.

Requesting standardized calculations according to ISO 6336 without referring to specific parts requires the use of only those parts that are currently designated as International Standards (see Table 1 for listing). When requesting further calculations, the relevant part or parts of ISO 6336 need to be specified. Use of a Technical Specification as acceptance criteria for a specific design needs to be agreed in advance between manufacturer and purchaser.

This document provides worked examples for the application of the calculation procedures defined in ISO/TS 6336-22. The example calculations cover the application to spur and helical cylindrical involute gears for both high-speed and low-speed operating conditions, determining the micropitting safety factor for each gear pair. The calculation procedures used are consistent with those presented in ISO/TS 6336-22. No additional calculations are presented in this document that are outside of ISO/TS 6336-22.

Four worked examples are presented with the necessary input data for each gear set provided at the beginning of the calculation. The worked examples are based on real gear pairs where either laboratory or operational field performance data has been established, with the examples covering several applications. When available, pictures and measurements are provided of the micropitting wear, experienced on the gear sets when run under the conditions used in the worked examples. Calculation details are presented in full for several of the initial calculations after which only summarized results data are included. For better applicability, the numbering of the formulae follows ISO/TS 6336-22. Several of the worked examples are presented with the calculation procedures performed in accordance with the application of both methods A and B.

1 Scope

The example calculations presented here are provided for guidance on the application of the technical specification ISO/TS 6336-22 only. Any of the values or the data presented should not be used as material or lubricant allowables or as recommendations for micro-geometry in real applications when applying this procedure. The necessary parameters and allowable film thickness values, λ_GFP, should be determined for a given application in accordance with the procedures defined in ISO/TS 6336-22.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1122-1, ISO 6336-1 and ISO 6336-2 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography