Structural classification of Powertrain Gears.


Generally there are gear teeth, tooth grooves, end faces, normal surfaces, top of the tooth circle, root circle, base circle, indexing circle.

Gear tooth

Referred to as teeth, is each of the raised parts of the gear for meshing, these raised parts are generally arranged in a radial shape, the gear teeth on the matching gear contact each other, can make the gear continuous meshing operation.


Is the space between two adjacent teeth on the gear; The end face is the plane on the cylindrical gear or cylindrical worm, perpendicular to the axis of the gear or worm.

End face

It's the plane at both ends of the gear.

Normal plane

Refers to the plane perpendicular to the tooth line of the gear teeth.

Addendum circle

It's the circle where the tip of the tooth is.

Dedendum circle

It's the circle where the bottom of the slot is.

Base circle

The producing line that forms an involute makes a circle of pure rolling.

Reference circle

It is the reference circle for calculating the geometry of the gear in the end face

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