The gears in speed change boxes and moment changers are normally of pan shape and will be carburized and quenched.Distortion of larger diameter gears will frequently overstep tolerance.

• 变速箱、变矩器中的齿轮大都属于薄盘类,而且需要进行渗碳淬火处理,盘径较大的则经常出现变形超差现象。