Terms Used in Gears

Fig. 4.2. Spur Gear and Pinion pair

Terms used in Gear

Addendum: The radial distance between the Pitch Circle and the top of the teeth.

Dedendum: The radial distance between the bottom of the tooth to pitch circle.

Base Circle: The circle from which is generated the involute curve upon which the tooth profile is based.

Center Distance: The distance between centers of two gears.

Circular Pitch: Millimeter of Pitch Circle circumference per tooth.

Circular Thickness: The thickness of the tooth measured along an arc following the Pitch Circle

Clearance: The distance between the top of a tooth and the bottom of the space into which it fits on themeshing gear.

Contact Ratio: The ratio of the length of the Arc of Action to the Circular Pitch.

Diametral Pitch: Teeth per mm of diameter.

Face: The working surface of a gear tooth, located between the pitch diameter and the top of the tooth.

Face Width: The width of the tooth measured parallel to the gear axis.

Flank: The working surface of a gear tooth, located between the pitch diameter and the bottom of the teeth

Gear: The larger of two meshed gears. If both gears are the same size, they are both called “gears”.

Land: The top surface of the tooth.

Line of Action: That line along which the point of contact between gear teeth travels, between the first point ofcontact and the last.

Module: Millimeter of Pitch Diameter to Teeth.

Pinion: The smaller of two meshed gears.

Pitch Circle: The circle, the radius of which is equal to the distance from the center of the gear to the pitchpoint.

Diametral pitch: Teeth per millimeter of pitch diameter.

Pitch Point: The point of tangency of the pitch circles of two meshing gears, where the Line of Centers crossesthe pitch circles.

Pressure Angle: Angle between the Line of Action and a line perpendicular to the Line of Centers.

Root Circle: The circle that passes through the bottom of the tooth spaces.

Working Depth: The depth to which a tooth extends into the space between teeth on the mating gear.

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