Crankshaft flange structure of diesel engine

The utility model relates to the technical field of diesel engine crankshafts, in particular to a crankshaft flange structure of a diesel engine, which comprises a transmission mechanism and a traction mechanism. The two positioning clamping pieces are installed at the inner end of the tail end rod and the inner end of the front end rod respectively, the main journals are located between every two adjacent positioning clamping pieces, and the output shaft is installed outside the tail end rod. A crankshaft arm rod is assembled among a balance block, a positioning clamping piece and a main journal, a sleeve is movably installed outside the crankshaft arm rod, two limiting outer rings with limiting clamping are assembled in two annular grooves in the outer portion of the sleeve in a matched mode, and a sealing gasket is installed on the inner sides of the limiting outer rings in combination with a plurality of elastic telescopic rods; the two combined limiting outer rings and the sealing gasket which are clampe