车钩钩身中心线至中梁上平面的距离(简称钩中)和钩身上平面至上挡角铁翼板下平面的距离(简称上挡间隙)是车钩装置的两项主要尺寸,检修中对其进行正确的计算与调整,是保证车钩装置检修质量的关键。 车钩钩中及上挡间隙尺寸的计算与调整按下列步骤进行: The distance between the center line of the coupler hook body and the upper plane of the middle beam (referred to as the hook) and the distance between the plane of the hook body and the lower plane of the upper wing (hereinafter referred to as the upper blockage) are the two major dimensions of the coupler device. Correct calculation and adjustment is the key to ensure the quality of overhauling coupler device. The calculation and adjustment of the gap size between the coupler hook and the upper block are as follows: