Kubota Corporation

Keita Naito

Yoshikazu Takemoto

Takashi Onishi

Toshio Nakahira

Hidetaka Morinaga

Yoshinori Tanaka

Hideyuki Koyama

Takahiro Yamazaki

Mitsugu Okuda

Manabu Miyazaki

Hiroki Kuwayama

Yutaka Ishigaki

Takemoto Yoshikazu

Onishi Takashi

An engine exhaust treatment device is capable of combusting PM accumulated in a DPF or activating an exhaust purification catalyst even immediately after engine startup or at the time of light load operation. A combustible gas supply passage () communicates with an exhaust passage () on an upstream of a combustion catalyst (). An air supply unit () and an ignition unit () are provided in this supply passage and interlocked with a control unit (). Where a temperature of the exhaust is lower than a predetermined temperature, the control unit supplies air () to a combustible gas by the air supply unit () and causes ignition of the combustible gas by the ignition unit (), so as to cause flame combustion of the combustible gas. The temperature of the exhaust () in the exhaust passage () is increased by heat of this flame combustion.

Engine exhaust treatment device

An exhaust treatment device of a diesel engine is provided in which combustible gas is burned with oxygen in exhaust, combustion heat increases a temperature of the exhaust, and heat of the exhaust can burn and remove PM accumulating in a DPF. In order to cause a heater for radiating heat at a start of generation of the combustible gas to enter a catalyst inlet portion, and fit a liquid fuel retaining member over a periphery of the heater, a guide plate is provided to a lower face of the liquid fuel retaining member so that the air-fuel mixture moving down in the liquid fuel retaining member flows along an upper face of the guide plate out to a periphery of the guide plate.

Exhaust treatment device of diesel engine

An engine in which an oil consumption and a leakage of blow-by gas can be stably reduced for a long period of time. The engine includes a first land (), a first ring groove (), a second land (), a second ring groove (), a third land (), a third ring groove (), and a piston skirt () formed on a piston peripheral wall () in the above-recited order from a side of a piston head (). A first pressure ring () is fitted in the first ring groove (). A second pressure ring () is fitted in the second ring groove (), an oil ring () fitted in the third ring groove (), and an indentation () is formed at the second land ().

Engine

An exhaust gas treatment device for a diesel engine capable of starting the generation of a combustible gas is provided. The device includes a combustible gas generator. A core member is fitted in the center portion of an annular wall to form an air-fuel mixing chamber between the inner peripheral surface of the annular wall and the outer peripheral surface of the core member. An air-fuel mixture gas in the air-fuel mixing chamber is adapted to be supplied from the end of the air-fuel mixing chamber to a combustible gas generating catalyst to a portion near the center thereof. A heater is used as the core member. The heat dissipating outer peripheral surface of the heater is exposed to the air-fuel mixing chamber. Heat is dissipated directly from the heat dissipating outer peripheral surface of the heater to the air-fuel mixing chamber when starting the generation of the combustible gas.

Exhaust gas treatment device for diesel engine

Growing community of inventors

Sakai, Japan

Keita Naito