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自1975年1月1日开始生效的OCT1643—72《圆柱齿轮传动·公差》同OCT1643—56标准相比,增加了一些新的规定。其中之一是有关传动中的齿接触规范。按OCT1643—56,对直齿和窄斜齿来说,仅仅用齿向误差作为评定齿接触的指标。按照新标准,接触指标同时还用接触线的形状和位置误差F(?)表示。这是个不大明显的变化,但对齿轮检验来说是极为重要的。它不仅正式承认按各种齿轮的接触线进行检验的方法和工具是适用的,而且还确定,这些方法同齿向检验的方法可同时采用。关于接触线的直观概念以及它同齿的螺旋
OCT 1643-72 “Spur Gears and Drives Tolerance”, effective January 1, 1975, adds a few new rules to the OCT 1643-56 standard. One of them is about the tooth contact specification in the transmission. According to OCT 1643-56, for straight and narrow helical gears, only the tooth-to-tooth error is used as an indicator of tooth contact. According to the new standard, the contact index is also expressed by the shape and position error F (?) Of the contact line. This is not a significant change, but it is extremely important for gear inspection. It not only formally acknowledges that methods and tools that perform inspection on the contact lines of various gears are applicable, but also that these methods can be used simultaneously with the method of tooth orientation inspection. An intuitive concept about the line of contact and its co-threaded helix