What are the commonly used professional terms for spur gears?
The design and structure of the spur gear have a significant impact on its performance. In order to complete the work effectively and efficiently, they need to be made of high-quality materials and have precise dimensions. The dimensional measurement of each feature is an integral part of the function of a specific gear. Therefore, when industry professionals need new spur gear designs or replacement spur gears, they must be familiar with the terminology of each gear part and its respective measurement values to ensure the clarity and accuracy of production or purchase orders.
Some commonly used spur gear terms include:
- Pitch circle: A circle derived from multiple teeth and a specified diameter pitch. The circle that determines the tooth spacing or tooth profile, and constructs the tooth ratio based on this circle.
- Diameter pitch: The ratio of the number of teeth to the diameter of the pitch circle.
- Pitch circle diameter: The diameter of the pitch circle. This is where the angular velocity of the spur gear is measured. This is also a key component to determine the center distance between paired spur gears.
- Center distance: The distance between two gears, measured from the center axis of one gear to the center axis of the mating gear. This can be roughly found by taking the radius of each spur gear pitch circle and adding them together.
- Modulus: The ratio of the reference diameter of the gear divided by the number of teeth. The modulus is the metric system equivalent to the diametral pitch.
- Appendix: The height of the tooth protruding beyond the pitch circle.
- Tooth root: The depth of the tooth groove below the pitch circle. It is generally larger than the tooth tip of the mating gear to provide clearance.
- Outer diameter: The diameter of the addendum circle or the circle along the outermost point of a spur gear tooth. The measured value is the maximum diameter of the spur gear.
- Root diameter: the diameter of the root of the tooth gap.
- Pressure angle: The angle at the node between the pressure line perpendicular to the tooth surface and the plane tangent to the nodal surface.
- Overall depth: The total depth of the alveolar, equal to the top of the tooth plus the root.
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