The module is the metric equivalent to diametral pitch. Module: The ratio of the reference diameter of the gear divided by the number of teeth.Fillet: The small radius that connects the tooth profile to the root circle.Diametral pitch: Ratio of the number of teeth to the pitch diameter.Generally greater than the addendum of the mating gear to provide clearance. Dedendum: Depth of the tooth between the pitch circle and the minor diameter.Clearance: The space between one gear minor diameter and the mating gears major diameter.Circular thickness: The thickness of the tooth at the pitch circle.Circular pitch: Measurement of the pitch circle arc length from one point on a tooth to the same point on the adjacent tooth.This can be roughly determined by taking the radius of each spur gear of the spur gears and adding them up. Center distance: The distance between two gears, measured from the center on the shaft of one gear to the center shaft of the mating gear.Base circle: A theoretical circle used to generate the involute curve when creating tooth profiles.Chordal addendum: The distance between a chord that passes through the points where the pitch circle crosses the tooth profile and the tooth tip.Chordal thickness: Tooth thickness measured along a chord that runs through the points where the pitch circle crosses the tooth profile.Backlash: The clearance between two mating teeth of separate gears.Addendum: The height of the tooth projects beyond the pitch circle.Internal gears are mainly used for planetary gears. Because the shafts are closer together, internal gear assemblies are more compact than external gear assemblies. An external gear sits in the internal gear and the gears rotate in the same direction. Internal gears are gears with teeth cut on the inside of the cylinder.Two external gears mesh and rotate in opposite directions. External gears are gears with teeth cut outside the cylinder.There are two primary types of spur gears as describe below: For this reason, spur gears are typically used for lower speed applications, although they can be used at almost any speed. The gear with more teeth is called “gear” and the gear with fewer teeth is called “pinion”. The involute shape means that spur gears only generate radial forces and not axial forces, but the method of tooth combing causes a high load on the gear teeth and a high level of noise. On the other hand, spur gears have a disadvantage if the teeth of a spur gear have an involute profile and mesh one tooth at a time. Since the tooth surfaces of the gears are parallel to the axes of the mounted shafts, no thrust is generated in the axial direction.ĭue to simple manufacturing, these gears can also be manufactured with a high degree of precision. Engineering Choice The Biggest Learning Platformīecause of their shape, they are classified as cylindrical gears.
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