车床、钻床等机床的进给传动机构,大多采用齿轮齿条传动。由于齿条周节t=πm为非整数,当进给齿轮旋转一周,其进给量b=πmZ亦为非整数,所以机床的名义进给量与实际进给量有一定误差。七十年代末,在设计上采用了标准齿轮与被称为周节变位齿条啮合的传动,以消除设计误差。实践证明,此举提高了机床进给精度,收到了良好效果。 Lathe, drilling and other machine tools feed gear, most of the gear rack and pinion. As the rack circumference t = πm non-integer, when the feed gear rotates a week, the feed b = πmZ also non-integer, so the machine tool nominal feed and the actual amount of feed has some error. The late seventies, in the design of the use of standard gear and known as the week of displacement gear meshing gear to eliminate design errors. Practice has proved that this move to improve the machine feed accuracy, received good results.