Hypoid Gear

hypoid gear

hypoid gears resemble spiral bevel gears except shaft axes not intersect. pitch surfaces appear conical but, compensate offset shaft, in fact hyperboloids of revolution. hypoid gears designed operate shafts @ 90 degrees. depending on side shaft offset to, relative angling of teeth, contact between hypoid gear teeth may smoother , more gradual spiral bevel gear teeth, have sliding action along meshing teeth rotates , therefore require of viscous types of gear oil avoid being extruded mating tooth faces, oil designated hp (for hypoid) followed number denoting viscosity. also, pinion can designed fewer teeth spiral bevel pinion, result gear ratios of 60:1 , higher feasible using single set of hypoid gears. style of gear common in motor vehicle drive trains, in concert differential. whereas regular (nonhypoid) ring-and-pinion gear set suitable many applications, not ideal vehicle drive trains because generates more noise , vibration hypoid does. bringing hypoid gears market mass-production applications engineering improvement of 1920s.