工程机械变速箱壳或变速箱盖上装置变速轴的各对孔必须同心,孔与轴的配合间隙一般应在0。10毫米左右。经过一、二个大修期的机械,该孔的椭圆度与圆锥度明显增大,例如:东方红-60推土机使用一万小时后,变速轴孔的椭圆度可达0.30毫米左右,必须进行加大修复,消除其椭圆度与圆锥度,否则变速箱壳就不能装机使用。 Each pair of holes in the gearshift shaft of the transmission case of the construction machinery or gearbox must be concentric, and the clearance between the hole and the shaft should generally be about 0.1mm. After one or two overhaul period machines, the ellipticity and the conicity of the hole are obviously increased. For example: After the Dongfanghong-60 bulldozer is used for 10,000 hours, the ellipticity of the shifting shaft hole can reach 0.30 mm or so, and must be added. Large repair, eliminate its ellipticity and conicity, otherwise the transmission case can not be installed.