ISO 14635-1:2023 ギア — FZG 試験手順 — Part 1: オイルの相対スカッフィング耐荷重能力に関する FZG 試験方法 A/8、3/90 | 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 second edition cancels and replaces the first edition (ISO 14635-1:2000), of which it constitutes a minor revision. The changes are as follows:

• ISO 1328-1:1995 ¹ has been dated as this document uses accuracy grade which is numerically different than tolerance class in ISO 1328-1:2013;
• replacement of ISO 4287 which has been withdrawn and replaced by ISO 21920-2;
• replacement of ISO 4964 which has been withdrawn and similar information can be found in ISO 18265;
• replacement of some bibliography entries which were withdrawn, and changes from dated to undated references;
• subclause 5.2, wording harmonized with the ISO 14635 series;
• Table 1, description"pitch line circumferential speed (v_w)" has been replaced by"circumferential velocity at the pitch line" to harmonize the wording with the ISO 6336 series;
• Table 4, insertion of lines"Direction of rotation" and"Test lubrication volume" to conform to the information in the ISO 14635 series.

A list of all parts in the ISO 14635 series can be found on the ISO website.

Introduction

The types of gear failures which can be influenced by the lubricant in use are scuffing, low-speed wear and the gear-surface fatigue phenomena known as micro- and macropitting. In the gear design process, these gear damages are taken into consideration by the use of specific lubricant and service-related characteristic values. For an accurate, field-related selection of these values, adequate lubricant test procedures are required. The FZG ² test procedures described in this document, ISO 14635-2 and ISO 14635-3 can be regarded as tools for the determination of the lubricant-related characteristic values to be introduced into the load-carrying capacity calculation of gears.

FZG test method A/8,3/90 for the relative scuffing load-carrying capacity of oils described in this document is typical for the majority of applications in industrial and marine gears. ISO 14635-2 is related to the relative scuffing load-carrying capacity of oils of very high extreme pressure (EP) properties, as used for the lubrication of automotive driveline components. Other FZG test procedures for the determination of low-speed wear, micro- and macropitting load-carrying capacity of gears are intended to be added to the ISO 14635 series as further parts.

1 Scope

This document specifies a test method based on a FZG four-square test machine to determine the relative load-carrying capacity of lubricating oils defined by the gear-surface damage known as scuffing. High surface temperatures due to high surface pressures and sliding velocities can initiate the breakdown of the lubricant films. This test method can be used to assess such lubricant breakdown under defined conditions of temperature, high sliding velocity and stepwise increased load.

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 following terms and definitions apply.

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

Bibliography