Patent ID: 8336302

Claim:
An exhaust device for a diesel engine having a diesel engine exhaust gas ( 9 ) in an exhaust-gas route ( 7 ) upstream of a diesel-particulate-filter ( 6 ), the exhaust device using a supplied air ( 13 ) and a liquid fuel ( 3 ) from a liquid-fuel supply source ( 1 ) supplying the liquid fuel ( 3 ) to a gas generator ( 2 ) configured to convert the liquid fuel ( 3 ) to flammable gas ( 4 ) for burning exhaust-gas fine particles residual at the diesel-particulate-filter ( 6 ), the exhaust device comprising: a flammable-gas led-out pipe ( 5 ) communicated with the gas generator ( 2 ) and the exhaust-gas route ( 7 ), the flammable-gas led-out pipe ( 5 ) having a terminal end portion ( 5 a ) disposed within the exhaust-gas route ( 7 ) upstream of the diesel-particulate filter ( 6 ); a metal cylinder ( 10 ) arranged at the terminal end portion ( 5 a ) of the flammable-gas led-out pipe ( 5 ), the metal cylinder having an outer peripheral surface; an oxidation catalyst ( 8 ) disposed within the metal cylinder ( 10 ) and an air-supply passage ( 12 ) on the upstream side of the oxidation catalyst ( 8 ), the air-supply passage ( 12 ) having an outlet ( 12 a ) arranged in the metal cylinder ( 10 ) to allow the supplied air ( 13 ) to merge with the flammable gas ( 4 ), wherein the flammable gas ( 4 ), upon merging with the supplied air ( 13 ) is burnt with the oxidation catalyst ( 8 ) to produce combustion heat radiating from the outer peripheral surface of the metal cylinder ( 10 ) into the exhaust gas ( 9 ) in the exhaust-gas route ( 7 ) heating the exhaust gas ( 9 ) mixing with the flammable gas ( 4 ) that has passed through the oxidation catalyst ( 8 ), the flammable-gas led-out pipe ( 5 ) enters the exhaust-gas route ( 7 ) by penetrating a peripheral wall thereof and has the terminal end portion ( 5 a ) to which the metal cylinder ( 10 ) is disposed along a central portion of the exhaust gas route ( 7 ), and the air-supply passage ( 12 ) enters the flammable-gas led-out pipe ( 5 ) by penetrating a peripheral wall thereof outside the exhaust-gas route ( 7 ) and has the outlet ( 12 a ) which is opened inside the flammable-gas led-out pipe ( 5 ) within the exhaust-gas route ( 7 ).