转向器齿轮齿条传动副的几何和啮合计算

齿轮齿条式转向器中的齿轮齿数仅有5～8个齿，按标准齿轮或简单变位齿轮的几何计算方法设计齿轮和齿争，无法使其重合度达到1.0.文章介绍了运用虚拟齿轮及当量齿轮的方法计算重合度，并通过大量计算得到参数选择表，方便设计师的查阅使用。阐述了齿轮齿顶圆齿厚计算方法、齿条齿根圆角及齿务齿根过渡曲线干涉验算方法。表明通过合理选择变位系数、齿顶高及齿根高，可以确保齿轮和齿顶圆齿厚达到0．3—0．5个模数，重合度达到1．0。并给出计算实例：

Geometric and Mesh Calculation of Transmission Pair of Rack-and-Pinion SteeringGear

The tooth number of pinion in rack-and-pinion steering only is 5-8. It is impossible to reach to 1.0 of the contact ratio by using the geometric calculation method to design rack and pinion based on the standard gear. This article introduces a new method to calculate the contact ratio by the concept virtual gear and equivalent spur gear, and to get a parameter table which help designer easy to check through large amount of calculation. Additionally the article also describes a new method to calculate tooth thickness on addemtum circle, to determine rack and root angle and illustrates a way to verify the rack and root transition curve. It has shown that the root thickness on addendum circle can be ensured to 0.3-0.5 mn and contact ratio to 1.0 through setting the coefficient, addendum and dedendum. Finally, an example was given to verify the correction.