Bevel Gear

Bevel gears transmit motion between shafts that have intersecting central lines. These are known as coplanar shafts. Bevel gearing as it is known, comes in two main types. Straight bevel gear usually have the intersecting angle at 90 degrees – but can go as high as 180 degrees - and spiral bevel gears, which are designed in a curved manner, produce a quieter and smoother operation overall. Bevel gears feature conical blanks. Straight bevel gears have the height of the teeth tapered and are also tapered in thickness. Mitre gears are another form of bevel gears. When the mating gears are equal in size (with equal numbers of teeth) and the shafts are positioned at 90 degree angles to one another, bevel gears are classed a mitre gears. Spiral bevel gears have helical-angled teeth. Not only do they provide a quieter operation than conventional bevel gears, they are also capable of handling heavier loads. Bevel gears are used in a diverse range of applications, from differential drives to hand drills to rotorcraft drive mechanisms. The different qualities of straight and spiral bevel gears make them suitable for different uses.

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