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普通蜗杆机构磨损后产生的齿侧间隙难以调整,要求调整齿侧间隙则必然使机构的结构复杂化。采用双导程蜗杆机构,可以通过改变双导程蜗杆的轴向位置来达到调整蜗杆机构齿侧间隙的目的。本文指出双导程机构不是两个不同模数的蜗杆机构的简单组合,其实质是一种复合的相对变位蜗杆机构。这种传动的问题应当用蜗杆传动的变位理论去解决。本文指出了传动中啮合区的偏移和计算啮合区的方法。分析了两种齿形角的设计方法以及应用的范围,不同的齿形角会得到不同的啮合特性,这是生产中希望解决的问题。
It is difficult to adjust the flank clearance caused by the wear of an ordinary worm mechanism. The adjustment of the flank clearance is bound to complicate the structure of the mechanism. The use of double-lead worm mechanism, you can change the double-lead worm axial position to achieve the purpose of adjusting the worm gear mechanism side clearance. This paper points out that dual-lead mechanism is not a simple combination of two different modulus worm mechanism, and its essence is a compound relative displacement worm mechanism. The problem of this kind of transmission should be solved by the theory of worm gear transmission displacement. This paper points out the offset of the meshing area in the transmission and the method of calculating the meshing area. The design method of two kinds of profile angle and the range of application are analyzed. Different profile angles will get different meshing characteristics, which is the problem to be solved in the production.