Engine device

摘要

An engine device is provided with an urea mixing pipe which injects urea water into exhaust gas of an engine, and an exhaust gas purification case which removes nitrogen oxide in the exhaust gas of the engine, and is structured such that an exhaust gas inlet pipe of the exhaust gas purification case is connected to an outlet of the urea mixing pipe via a flange body. Exhaust gas outlet side end portions of an outer pipe and an inner pipe of the urea mixing pipe having a double-pipe structure are connected to exhaust gas inlet side end portions of an outer pipe and an inner pipe of the exhaust gas inlet pipe having a double-pipe structure. Fitting small-diameter portions are formed in an end portion of the inner pipe of the urea mixing pipe, and the fitting small-diameter portions are inward insert to an inner portion of the inner pipe of the exhaust gas inlet pipe.

主权项

1. An engine device comprising:
a urea injection nozzle which injects urea water into exhaust gas of an engine; a urea mixing pipe configured to mix the urea water from the urea injection nozzle into exhaust gas of the engine; an exhaust gas purification case which removes nitrogen oxide in the exhaust gas of the engine; and the engine device being structured such that an exhaust gas inlet pipe of the exhaust gas purification case is connected to an outlet of the urea mixing pipe via a flange body, wherein exhaust gas outlet side end portions of an outer pipe and an inner pipe of the urea mixing pipe having a double-pipe structure are connected to exhaust gas inlet side end portions of an outer pipe and an inner pipe of the exhaust gas inlet pipe having a double-pipe structure, a fitting small-diameter portion is formed in an end portion of the inner pipe of the urea mixing pipe, and the fitting small-diameter portion is inward insert to an inner portion of the inner pipe of the exhaust gas inlet pipe.