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蜗杆蜗轮传动机构具有较大的传动比，零件数目少，整体结构很紧凑，在传动过程中产生的冲击载荷小，传动平稳，噪音低，还具有自锁性等优点，但缺点是摩擦磨损较大，蜗轮制造成本高。以斜齿轮来代替蜗轮组成圆柱蜗杆斜齿轮传动机构就能很好的克服这种缺点并保留原有的优点。

The advantages of worm gear transmission mechanism are high transmission ratio, less number of parts, overall compact structure, low impact load generated during transmission, smooth transmission, low noise and self-locking, and the disadvantages are high frictional wear and high cost for manufacturing worm gear. The cylindrical worm helical gear transmission mechanism which uses helical gear instead of the worm gear perfectly overcomes the disadvantages while retains the (intrinsic) advantages.

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论文翻译：
Worm drive mechanism has a large transmission ratio, small number of parts, the overall structure is very compact, resulting in the transmission process of the impact load is small, smooth transmission, low noise, also has a self-locking, but the disadvantage is greater friction and wear, worm high manufacturing costs. In helical gears instead composed of cylindrical worm worm helical gear mechanism to overcome this disadvantage can be a good and retain the advantage. In the automotive field, this transmission mechanism widely used, often with plastic instead of metal materials to produce helical gears. Cylindrical Worm Helical Gear coincidence degree size affects the stability of the entire transmission process and the size of the noise. With cylindrical worm and helical gears meshing planar face as the research object, first calculate the actual meshing line length of the projection on the end face, according to face France plane conversion relationship to calculate the actual meshing line length, degree of coincidence derived formula. Build a GUI using MATLAB interface module generates coincidence degree of each parameter is calculated as a function of degree of coincidence images. Drawing France face pressure angle, addendum coefficient, helical gears modification coefficient, lead angle worm, helical gear with a function of degree of coincidence images summarize the five parameters on the coincidence degree of regularity, to facilitate the production process designed with the ideal degree of coincidence of cylindrical worm helical gear transmission mechanism.