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一、问题的提出仪器制造的设计人员,在设计传递运动或读数的小模数蜗轮(以下简称蜗轮)时,所用的计算式有些选自小模数齿轮测量手册或光学仪器设计手册(均为72年版)等书籍。这些书中所列的计算式存在一定的问题。比较正确的蜗轮外径计算式应该是: 但是,中心包角之半δ值的计算式是一个经验公式:它本身不很严格,计算后的δ值往往偏大。
I. PROBLEM PROBLEMS Designers of instrumentation used in the design of small module worm gears (hereinafter referred to as worm wheels) that transmit movements or readings are selected from a small module gear measurement manual or an optical instrument design manual 72-year edition) and other books. The equations listed in these books have some problems. A more accurate calculation of the outer diameter of the worm gear should be: However, the formula for calculating the half-value of the center wrap angle is an empirical formula: it is not very strict in itself and the calculated value of δ is often too large.