Plastic gear parameter standards refer to the technical specifications used to regulate the design, manufacture, and inspection of plastic gears. They typically cover key parameters such as module, number of teeth, pressure angle, tooth width, and material properties.
1. Module: A fundamental parameter determining gear size, commonly ranging from 0.5-5mm, requiring selection based on load and speed.
2. Number of Teeth: Affects the gear ratio, typically 12-60 teeth, and must match the mating gear.
3. Pressure Angle: Standard value is 20°, 25° can be selected for high-load applications.
4. Face Width: Generally 6-10 times the module; too narrow a face width can lead to insufficient strength.
5. Material Properties: Tensile strength (e.g., PA66 ≥ 80MPa), heat distortion temperature (e.g., POM ≥ 110℃), etc., must be specified.
6. Accuracy Class: Classified into 1-12 grades according to ISO 1328, with grades 7-9 being commonly used.
