AGMA 925-B22 PDF

This information sheet is designed to provide currently available tribological information pertaining to lubrication of industrial gears for power transmission applications. It is intended to serve as a general guideline and source of information about gear lubricants and the influences of their properties, gear tooth surface roughness, and pressure distribution in the contact region on the general tribological behavior in gear contacts. Manufacturers and end-users are encouraged, however, to work with their lubricant suppliers to address specific concerns or special issues that may not be covered here (such as greases).

The equations provided herein allow the user to calculate specific lubricant film thickness and instantaneous contact (flash) temperature for gears in service. These two parameters are considered critical in defining areas of operation that may lead to unwanted surface distress. Surface distress may be scuffing (adhesive wear), fatigue (micropitting and macropitting), or excessive abrasive wear. Each of these forms of surface distress may be influenced by the lubricant. The calculations are offered to help assess the potential risk involved with a given lubricant choice. Flow charts are included as aids to using the equations.

This information sheet is a supplement to ANSI/AGMA 2101. It has been introduced as an aid to the gear manufacturing and user community. Accumulation of feedback data will serve to enhance future developments and improved methods to evaluate lubricant related surface distress.