1. The teeth of the Flat Pulley are referred to as teeth for short, which is the part of each protrusion used for meshing on the Flat Pulley. These protruding parts are generally arranged in a radial shape and will contact the matching upper teeth so that the Flat Pulley can continuously carry out meshing transmission.

2. The wheel groove of the Flat Pulley is the space between two adjacent gear teeth on the Flat Pulley body. Its end face is on the cylindrical gear or the cylindrical worm, perpendicular to the Flat Pulley or a plane above the axis of the worm.

3. The end face of the Flat Pulley is a plane above the two ends of the Flat Pulley.

4. The normal surface of the Flat Pulley refers to a plane that exists on the tooth line perpendicular to the Flat Pulley.

5. The addendum circle of Flat Pulley refers to the circle existing on the tooth tip of Flat Pulley.

6. The dedendum circle of Flat Pulley refers to the circle existing at the bottom of Flat Pulley's groove.

7. The base circle of Flat Pulley refers to the pure rolling circle formed by the line formed above the involute formed by Flat Pulley.

8. The indexing circle of Flat Pulley refers to the reference circle that Flat Pulley calculates on the geometric dimensions of the gear in the end face.

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