Optimization of fatigue carrying capacity of Spiral bevel gear pair

Spiral bevel gear pair is the main part affecting the performance of axle and vehicle. It is widely used because of its high strength, smooth transmission and low noise.Spiral bevel gears are the most core drive elements of axles. Bending fatigue toothing of tooth roots and contact fatigue toothing of tooth surfaces are the main forms of failure in the aftermarket. The failure morphology is shown in the figure.

Comprehensive analysis and optimization of gear pair fatigue bearing capacity can realize active design of spiral bevel gear pair and greatly reduce the time and economic cost of new product development.Deng Zhongzhong and others carried out high overlap design based on transmission error in order to improve actual overlap and make full use of gear tooth surface to reduce vibration and noise.Pu Taiping studied LTCA analysis of spiral bevel gear pair based on Abaqus software and obtained contact stress, root bending stress and overlap information of gear pair.

Although spiral bevel gear pair has been widely used, there are few papers on its fatigue load capacity analysis and optimization. ZHY Gear takes the fatigue load capacity of spiral bevel gear pair as the research object.

The method for optimizing the fatigue bearing capacity design of hypoid gear pair was studied, and the bearing capacity of hypoid gear pair was optimized from macroscopic geometric parameters, tool parameters and modification parameters.The main conclusions are as follows:

(1) According to the tooth root bending and tooth contact stress formulas, parameters such as modulus, tooth width, pitch diameter of large end of large wheel, number of teeth, etc. can be optimized in the design of the toothed billet to obtain a smaller stress value;

(2) Increasing the working tooth height coefficient and the tooth crest height coefficient of the gear pair can improve the end surface overlap of the gear pair, reduce the contact stress of the tooth surface and the bending stress of the root by 5%-10%, and effectively improve the fatigue strength of the gear pair;

(3) The stress distribution on the tooth surface can be optimized by using reasonable top edge trimming to avoid contact of the top edge of large gear teeth and reduce the bending stress of the root.

(4) Tooth height coefficient, large wheel cutter crest distance and small wheel cutter tip radius should be comprehensively optimized to achieve the optimum comprehensive fatigue strength of gear pairs.

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