Standard for Spur, Helical, Herringbone, and Bevel Enclosed Drives


Full Title: Standard for Spur, Helical, Herringbone, and Bevel Enclosed Drives

This Standard presents a method of rating the pitting resistance and bending strength of spur,
helical, herringbone, and bevel gears used for enclosed speed reducers and increasers. Also included is
information on unit rating, lubrication, components, thermal ratings, storage and installation.


This Standard is applicable to enclosed speed reducers and increasers wherein the gear tooth designs include spur, helical, herringbone or double helical, bevel, and their combination in multi-stage units.

Limitations. The rating methods and influences identified in this Standard are limited to enclosed drives of single and multiple stage designs where the pitch line velocities do not exceed 5000 feet per minute and pinion speeds do not exceed 3600 revolutions per minute.

Intended use. This Standard is not intended to assure performance of assembled gear drive systems. It is intended for use by the experienced gear designer capable of selecting reasonable values for the factors, based on his knowledge of performance of similar designs and the effects of such items as lubrication, deflection, manufacturing tolerances, metallurgy, residual stress and system dynamics. It is not intended for use by the engineering public at large

Exceptions. This Standard does not cover the design and application of epicyclic drives or gear blank design. It is beyond the scope of this Standard to present a detailed analysis of efficiency.

This Standard does not cover the rating of gear drives due to wear or scoring (scuffing) of gear teeth or components.

This Standard does not apply to gear drives that are covered by other specific AGMA application standards.