技术制图 齿轮的习惯画法

[中文适用范围]： 建立如何绘制齿轮的齿部分，包括蜗轮传动装置和链轮。 适用于详细图（单个齿轮）和装配图（齿轮对）。 作为基本原理，齿轮（轴向截面除外）表示为没有齿的实心零件，但在细长的点划线上添加了节面。 为了统一，所有图形均采用第一角度投影。 [外文原描述]： Establishes how to draw the toothed portion of gears including worm gearing and chain wheels. Applicable to detail drawings (individual gears) and assembly drawings (gear pairs). As a fundamental principle a gear is represented (except in axial section) as a solid part without teeth, but with the addition of the pitch surface in a thin long dash-and-dot line. For uniformity all figures are in first angle projection.