大重合度负传动弧齿锥齿轮的设计及承载性能分析

Design and Loaded Capability Analysis of High Contact Ratio Negative Transmission Spiral Bevel Gear

当前对于弧齿锥齿轮传动的振动、噪声的要求越来越高,迫切需要一种适宜于大重合度、平稳传动的弧齿锥齿轮设计方法。采用非零负变位设计可以提高弧齿锥齿轮的设计重合度,基于局部综合法进行大重合度加工参数设计,从几何设计与加工参数设计两个方面来提高弧齿锥齿轮的实际重合度,重合度的增加可以提高齿轮副的运转平稳性和承载能力。通过设计举例,将大重合度负变位设计与常规设计的结果进行对比:在相同的载荷下,新设计与常规设计的最大齿根弯曲应力相比,小轮减小40.5%,大轮减小27.5%,齿轮副的最大齿面接触应力减小3.2%。结果表明,采用所提出的设计方法使得小轮的齿根弯曲强度有了大幅度提高,齿轮副具有更高的寿命和可靠性。

With the higher requirement of the low vibration and noise of the spiral bevel gear, it is urgent to design a kind of large contact ratio and smooth transmission of spiral bevel gear. For non-zero-negative modification spiral bevel gear, the machining parameters can be designed with local synthesis to improve contact ratio. By geometric design and machining parameters design, the actual contact ratio of spiral bevel gears can be improved. Using an example, the new design was used to compare with conventional design. With the same load, compared with the conventional design, the maximal tooth root bending stress was reduced 40.5% for the small wheel, 27.5% for the large wheel, and 3 2% for the maximum tooth contact stress of the gear pair. The results show that the new design method makes tooth root bending strength improve greatly, and the gear pair has higher lifetime and reliability.