FUEL INJECTION NOZZLE FOR DME FUEL AND DIESEL ENGINE WITH THE FUEL INJECTION NOZZLE FOR DME FUEL

摘要

An existing diesel engine vehicle of light oil fuel is enabled to run as a diesel engine vehicle using DME as fuel without exchanging a whole diesel engine and at very low cost and easily. The shape of a tip part 21 of a needle valve 2 is set by a center diameter L3 for regulating a minimum flow path area at full lift of a fuel injection nozzle 1, a seat diameter L2 of a seat part 211 coming in contact with a valve seat part 33 and blocking communication with a fuel injection hole 31, and a shaft diameter L1, and a tip end angle is about 92 degrees. The center diameter L3 is set to phi 2.5 mm, the seat diameter L2 is set to phi 3.0 mm, and the shaft diameter L1 is set to phi 3.25 mm. The ratio of the center diameter L3 and the seat diameter L2 is L3/L2 = 2.5 mm/3.0 mm = about 0.833, and the ratio of the seat diameter L2 and the shaft diameter L1 is L2/L1 = 3.0 mm/3.25 mm = about 0.92.