Hino Motors, Ltd.

Hirofumi Tongu

Tomoyuki Tsuruta

Kuniharu Tobe

Noriyuki Tomita

An upstream portion of a communication passagein an exhaust emission control device has a gas gathering chamberA encircling and gathering exhaust gasfrom an exit end of a particulate filterthrough perpendicular turnabout of the gasand a communication pipeB extracting the gasgathered by the chamberA through an exhaust outletinto an entry side of a selective reduction catalystAn injectoris in the passageto add urea water into the gas flow. The injectoris fixed to the chamberA in a position opposed to the outletand in a direction perpendicular to an axis of the filterThe outletof the chamberA has a reactorinto which the reducing agent injected by the injectoris impinged to facilitate gasification of the gas

Exhaust purification apparatus

A lattice board is obliquely arranged in a bent portion halfway in an exhaust pipe where exhaust gas flows curvedly so as to bisect an angle made by inflow and outflow directions the exhaust gas entered upstream of and discharged downstream of the bent portion, respectively. An injector is arranged in the outflow direction of the exhaust gas to inject urea water to an entry side of the lattice board such that flow passage walls of the lattice board on which hit is the exhaust gas from upstream has rear surfaces on which hit is a spray of urea water from the injector.

Mixing structure

An exhaust purification device for purifying exhaust gas flowing in an exhaust gas flow passage of an engine includes: a cylindrical casing; a pipe that is disposed on a downstream side of the casing and inserted in the casing so as to extend in a direction substantially orthogonal to an axial direction of the casing, the pipe being provided with a through-hole communicating with the casing; and an injector configured to inject a reducing agent from an upstream end of the pipe into the pipe, in which a contracting flow passage portion narrowing in an axial direction of the pipe from an upstream side toward the downstream side is formed in the exhaust gas flow passage in the casing.

Exhaust purification device

An exhaust gas purification system includes an exhaust purifying element for purifying exhaust gas, and a selective reduction catalyst for promoting reduction of NOx contained in the exhaust gas with a reducing agent. A housing for accommodating the exhaust purifying element includes an outer wall having an accommodating portion. A supply hole is formed on a bottom of the accommodating portion. A pipe that is located inside the housing has a passage through which an interior of the pipe communicates with an exterior of the pipe. The pipe is configured to guide exhaust gas toward the selective reduction catalyst through the passage and the interior of the pipe. The pipe has an end communicating with the supply hole. The injection device of the exhaust gas purification system injects the reducing agent to an interior of the pipe through the supply hole.

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Hino, Japan

Hirofumi Tongu