Yanmar Co., Ltd.

Keiichi Tsujimoto

Ryota Kobayashi

Yoshinori Fukui

Shunji Hamaoka

Tetsuya Yokoyama

Kenya Onishi

An exhaust gas purification device including: a spray nozzle provided in an exhaust pipe of an engine; a mixer provided downstream of the spray nozzle in a flow direction of exhaust gas; and a catalyst reactor provided downstream of the mixer. The exhaust gas purification device is configured to spray a reducing agent from the urea water spray nozzle to the exhaust gas from the engine, to mix the reducing agent with the exhaust gas in the mixer, and to reduce nitrogen oxides in the exhaust gas using the catalyst reactor. The mixer includes a cylindrical body and a plurality of fins arranged in the cylindrical body radially outward with respect to the axis of the cylindrical body. The upstream portion of each fin is shaped to provide a cutoff portion.

Exhaust gas purification device

An object of the present invention is to provide a combustion chamber shape of a direct injection type diesel engine in which a black smoke generation amount can be suppressed during no-load operation while suppressing NOx and fuel consumption. The combustion chamberis formed in a recessed shape in a piston top walland injecting fuel at a predetermined nozzle hole angle &#x3b1; into the combustion chamberfrom a nozzle holeof a fuel injection valve having a nozzle hole center Osubstantially on a cylinder center line. A wall face of the combustion chamberincludes: a conical mountain portionformed at a central portion in the combustion chamber and having such a slope angle and skirt end diameter Dthat fuel spray does not collide with the mountain portion; a slope portionthat inclines downward and outward from a skirt end of the mountain portionat a smaller angle than the slope angle of the mountain portionand with which the fuel spray collides; and a saucer portionwhich rises in an arc shape from an outer peripheral end of the slope portionto reach an outer peripheral end of the combustion chamber and with which the fuel spray collides.

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Osaka, Japan

Keiichi Tsujimoto