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The basic circle and tooth root circle of the ivolute straight toothed spur gear are two important pa- rameters.

直齿圆柱齿轮是机械传动中应用最广泛的传动机构之一,齿轮能否正确啮合是由其几何参数决定,渐开线直齿圆柱齿轮的基圆与齿根圆是两个重要参数。

Thereafter the minimum centre distance and the minimum base circle radius are calculated.

采用简易作图法确定摆动从动件凸轮机构的转动中心，然后再计算其最小中心距和最小基圆半径。

In view of the fa t that the proper motion of the cam s follower can modify the trapezoidal acceleration,sine acceleration and 3-4-5th power polynomial,a study is made of the method for the determination of the cam s base circle radius in plate cam mechanism with radial translating follower.

本文针对凸轮机构推杆作改进梯形加速度、改进正弦加速度和３－４－５次多项式运动规律的情况，研究对心式盘形凸轮机构凸轮基圆半径的确定方法，并利用数值计算方法绘制了基圆半径系数β（ｒ＿０／ｈ）的线图。

In this paper,both the maximum pressure angle position of earns for the rectilinear radialtranslating follower and the calculation formula for the cams base circle radius are studiedon condition that the follower s regular motion of constant acceleration and deceleration hasbeen selected.

本文研究了对心直动从动件盘形凸轮机构中，当从动件采用等加等减速运动规律时压力角最大值的发生位置及其相应的基圆半径计算公式，并由此根据诺模学原理建立了便于工程上使用的确定凸轮基圆半径诺模图，此种诺模图是对一直沿用至今的原诺模图的一种补充和修正。

After analyseing the force of all the component in the cam with Direct-Moving-roller follower, the conclusion is gained that radius of base circle not only influence the ability of sending force, but also influence the roller s continuous rolling.

对滚子直动从动件盘形凸轮机构各构件进行了受力分析后,得出基圆半径的大小不仅影响传力特性,还影响滚子是否能做连续滚动的结论。

For dasing of spatial cam mechanism,the radius of base circle is an important parameter.

本文以求解平面凸轮机构的基本论点为依据，得出可展开面空间凸轮机构的基圆半径与许用压力角、曲率半径的关系式。