Gear tooth (tooth) - each convex part of a gear used for meshing. Generally speaking, these bulges are arranged in a radial manner. The teeth on the mating gear are in contact with each other, resulting in the continuous meshing operation of the gear.
Cog space between two adjacent teeth on a gear.
End face the plane perpendicular to the axis of a gear or worm on a cylindrical gear or worm.
Normal plane on a gear, the normal plane is the plane perpendicular to the tooth line of the gear.
Addendum circle the circle in which the top of a tooth is located.
Dedendum circle the circle where the groove bottom is located.
Base circle the circle on which the generating line of an involute forms a pure roll.
Dividing circle - the reference circle for calculating the geometric dimensions of the gear in the end face. For spur gears, the modulus and pressure angle on the dividing circle are standard values.
Tooth surface the side surface of a gear tooth between the top cylindrical surface and the root cylindrical surface.
Tooth profile the section of a tooth surface that is cut by a specified surface (a plane for cylindrical gears).
Tooth line - the intersection line between the tooth surface and the indexing cylinder.
