{"data":{"fields":"term_definition","term_definition":"
Conical in form and operates on intersecting axes which are usually at right angles. Bevel gears are widely used in applications involving power transmission between intersecting shafts where the angle between shafts is equal to the sum of the pitch angles of the mating gears. On a straight bevel gear, the teeth are formed with all elements on planes which intersect at the axis of the gear. Bevel gear teeth are tapered in both thickness and height, with the outer portion (the heel) longer than the inner part (or toe). The tooth profile in a normal section is approximately that of an involute spur gear. The pressure angles most commonly used for bevel gears are 14.5 and 20\u00b0. Dimensions will vary with the shaft angle and are not given here. Bevel gears exert both axial thrust and radial loads on the shaft support bearings, which must be accounted for. Also, if bevel gears have too few teeth, undercutting can be a problem.<\/div>
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