A multiplier in gear rating, usually between about 1.1 and 2, that accounts for load concentrated toward part of the face width instead of spread evenly. Misalignment, shaft and housing deflection, helix errors and face width to diameter ratio drive it up. Wide, flexible gears get large factors, and crowning or helix correction is the usual way to bring it down.
Face load factor came out at 1.8 with the overhung pinion, that kills the rating, add a bearing or crown the teeth.
Also heard as
- load distribution factor
- KH beta
- Km
Related terms
Edge loading
Tooth load piling up at one end of the face width because of misalignment or deflection.
Crowning
A slight barrel shape along the tooth face so contact stays centered despite misalignment and shaft deflection.
Helix deviation
How far a tooth's actual path across the face width departs from the intended helix, including crowning.