金属蜗杆与塑料斜齿轮不等齿距啮合方法

为了进一步提高金属蜗杆与塑料斜齿轮传动中塑料齿轮的承载能力，研究了传统等齿距蜗杆与斜齿轮啮合传动时受力的特点，提出了蜗杆与斜齿轮不等齿距啮合方法。基于梁弯曲理论和轮齿变形理论，得到了齿面载荷、变形及接触刚度的关系，并以轮齿齿根弯曲变形率相等为前提，推导了不等齿距啮合的设计方法，得到了不等齿距啮合时蜗杆的齿距调整量，通过静态强度实验进行了验证。实验结果表明:不等齿距设计可以使塑料斜齿轮的承载能力提高13.69%。 

Method of unequal pitch meshing of metal worm and plastic helical gear

In order to further improve the bearing capacity of plastic gears in the transmission of metal worm and plastic helical gears, the force characteristics of the traditional equal-pitch worm helical gear meshing transmission were studied in depth, and the unequal pitch meshing of the worm and the helical gear was innovatively proposed. Based on beam bending theory and gear tooth deformation theory, the relationship between tooth surface load, deformation and contact stiffness is obtained.On the premise that the bending deformation rate of the gear tooth root is equal, the theoretical design method of unequal meshing is deduced, and the pitch adjustment of the worm in the case of unequal pitch meshing is obtained, which is verified by static strength experiments.The experimental results show that the unequal pitch design can increase the load-bearing capacity of the plastic helical gear by 13.69%.