RESEARCH ON MODELING METHOD FOR GEAR MODIFICATION OF WIND POWER PITCH BEARING

In this paper, an accurate modeling method for pitch bearing gear modification is proposed to determine the modification amount of pitch bearing gear. Discrete tooth profile points are established according to the tooth profile equation, accurate tooth profile lines are obtained by B-spline fitting, and the gear model is established. The grid is divided and the grid method is used to densify the contact area of the gear. Based on the properties of normals of involute, the offset direction of nodes in the encrypted area is derived geometrically. The offset amount of nodes is calculated through the modification curve function, and the nodes are offset along the offset direction to obtain the modified pitch bearing gear model. Establish multiple models of pitch bearing gears with different modification amounts, assemble them into the pitch shaft system for tooth contact calculation, and compare the calculation results to determine the optimal modification amount. When the maximum modification amount is 40 μm, the tooth contact stress is the smallest, which is basically the same as the calculation results of two classic drum modification formulas, proving the reliability of the model. According to the modeling method in the article, the modification amount of pitch bearing gears can be quickly and effectively determined. © 2024 Science Press. All rights reserved.