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Buhler grain mechanical gear teeth short, every one raised portion for engaging the gear, these raised portions generally radially arranged contact between mating gear teeth on the gear can operate in constant engagement; gullet is two adjacent teeth on the gear space between; the end surface is cylindrical or cylindrical worm gear, or a plane perpendicular to the axis of the worm gear; slope face refers to a plane perpendicular to the line of the tooth; tooth addendum circle means where the top of the circle; root circle means the circle where the bottom; base circle is formed involute line occurs for pure rolling circle; pitch circle is calculated in the end face of the gear geometry reference circle.

Toothed gear can, gear shape, Tooth shapes, where the surface of the tooth and manufacturing methods classification.

Toothed gear, including the tooth profile, pressure angle, tooth height and displacement. Involute gear relatively easy to manufacture, and therefore the use of modern gear, involute gear absolute majority, and cycloid gear and circular gear is seldom used.