Drilling jig auxiliary device for crankshaft flange hole of diesel engine

The utility model belongs to the technology for machining and manufacturing a crankshaft of a diesel engine of an internal combustion railway locomotive, and provides a drilling jig auxiliary device for a crankshaft flange hole of a diesel engine. The drilling jig auxiliary device comprises a bottom plate (1), a transitional sleeve (2), a positioning screw (5), flange hole rapid-changing sleeves (3) and lifting ring screws (4); wherein the bottom plate (1) is provided with a plurality of through holes for installation of the transitional sleeve along the circumference; the flange hole rapid-changing sleeves (3) are divided into three types: fine drilling sleeves, crude hinging sleeves and fine hinging sleeves; and two lifting ring screws (4) are adopted and are fixed on the two corresponding sides of the bottom plate (1). The drilling jig auxiliary device for the crankshaft flange hole of the diesel engine has the characteristics of reasonable design structure, and simple and convenient in use, the manufactur