Contact stress in helical bevel gears

Helical bevel gears have inclined or twisted teeth on a conical surface and the common types are skew, spiral, zerol, hypoid gears. However, this study does not include Due to geometric complexities of gears, commonly used methods in their design based concept equivalent virtual spur gear. The approach paper is following assumptions, a) helix angle helical equal mean spiral angle, b) pitch diameter at backend defined as that gear, c) Tredgold's approximation applied Upon these premises, contact stress capacity formulated explicit parameters. new model estimate three gear systems for application examples compared with previous solutions. Differences between estimated results solutions vary from -3% -11%, estimates being consistently but marginally slightly lower than solution values. Though differences appear be small, they significant because durability strongly influenced by stress. For example, 5% reduction may result almost 50% increase some steel materials. equations developed do apply crown