Expressed as the shape error of logarithmic spiral bevel gear, the vertical distance between each measuring point on the real tooth surface and the theoretical tooth surface describes the local error. It is quantitatively evaluated by two parameters: tooth width direction and tooth profile direction. The variation trend of tooth width direction of logarithmic spiral bevel gear can be understood as the error of helix angle, and the average helix angle is adopted Ψ To describe quantitatively;
The change trend of tooth profile direction of logarithmic spiral bevel gear can be understood as pressure angle error, and the average pressure angle is adopted φ To quantitatively describe:
