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渐开线花键的自定心作用仅当径向力小于临界值时生效。不然齿侧面将发生微动磨损,配对付之间将不同心。为更好地设计需要建立一个临界条件。一个接触应力的连续分布函数 p(θ)用来描述齿间载荷的分配。该函数可展开为 Fourier级数,其前三项已足够精确并可由三个平衡方程来确定。p(θ)应满足的条件为 p(θ)≥0,因为 p(θ)<0即是拉应力,这不可能在接触面间存在。由此得到临界条件并可使许用应力不必减少到较低的水平。文中定义了一个由径向力产生的载荷分布系数 K_f,其结果使挤压应力可较精确地的计算。文中讨论了一个实际的例子,
The self-centering effect of the involute spline takes effect only when the radial force is less than the critical value. Otherwise, fretting wear occurs on the side of the tooth, and the pairing will not be the same between the two. To establish a critical condition for better design needs. A contact stress continuous distribution function p (θ) is used to describe the distribution of interdental loads. This function can be expanded to Fourier series, the first three are sufficiently accurate and can be determined by the three equilibrium equations. The condition that p (θ) should satisfy is p (θ) ≥0, because p (θ) <0 is the tensile stress, which can not exist between the contact surfaces. This results in critical conditions and allows the allowable stress not to be reduced to lower levels. In this paper, a load distribution coefficient K_f generated by radial force is defined. As a result, the compressive stress can be calculated more accurately. The article discusses a practical example,