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在圆柱齿轮测量中,顶圆直径是常需要测量的尺寸之一,但现有的一些测量方法,往往不适合于条件较差的现场采用。特别是当齿轮直径较大,且齿轮自身的轮毂(或处于安装状态下的其它机件)凸出于齿轮端面时,就不能用直尺通过齿轮端面中心直接测量其顶圆直径,而大游标卡尺一般又都不具备。此外,若用间接法测量(如用具有弹性的钢皮尺紧贴于齿顶,并沿周向量出一段包含少数齿的弧长后推算的局部弧长法;用直尺在齿轮端面上,沿齿顶圆量出跨部分齿的弦长来推算的弦长法),则常因累积误差较大而不可靠,
In cylindrical gear measurement, the tip diameter is often one of the dimensions to be measured, but some of the existing measurement methods are often not suitable for poor field conditions. Especially when the gear diameter is large and the gear’s own hub (or other parts in the installed state) protrudes from the gear end surface, the diameter of the top circle can not be directly measured by the straight edge of the gear through the straight edge of the gear. The large vernier caliper Generally do not have. In addition, if the indirect method (such as using a flexible steel tape close to the top of the tooth addendum, and along the weeks to measure the length of arc containing a small number of teeth after the reckoning local arc length method; with ruler on the gear surface, along The amount of addendum circle teeth span chord to calculate the chord length method), often due to the cumulative error is larger and not reliable,