Kubota Corporation

Yoshikazu Takemoto

Takashi Onishi

Tomoya Akitomo

Mitsugu Okuda

Toshio Nakahira

Keita Naito

Osami Fujiwara

Hironori Tsuchihashi

Yuichi Tamaki

Katsuaki Arai

Yoshikazu Togoshi

Hideya Umemoto

Tetsuya Kosaka

Kentaro Nagai

Manabu Miyazaki

Hideyuki Goto

Masayasu Takami

Kazutomo Miyaguchi

Takahito Hamasaki

Kazunari Tsujino

Hidetaka Morinaga

Hozumi Ishida

Kumiko Sakaguchi

Tadao Yamato

An engine with an EGR device includes an engine case, and an EGR pipe that introduces an EGR gas into an intake path. The EGR pipe is arranged to pass through an inside of the engine case. A part of the EGR pipe in the engine case is arranged to face a cooling water path in the engine case. The engine case is defined by a cylinder head. The cooling water path is arranged to surround a whole circumference of the EGR pipe.

Engine with EGR device

A work vehicle having a hood for covering an engine room is disclosed. The engine room has a first region and a second region partitioned from each other, the engine room being configured such that air can be introduced from outside of the hood to the first region. A radiator is disposed in the first region, and air flows through the radiator from the first region to the second region. In the second region, the engine and an accessory unit for the engine are provided. The work vehicle includes an adjusting device for adjusting an amount of the air that flows from the first region to the second region.

Work vehicle

An exhaust gas processing device for an engine, capable of securely warming a combustion catalyst, is provided. A combustion catalyst burning gas is produced when a warming end condition for the combustion catalyst is established, which signifies the establishment of either one of a first condition or a second condition. In the first condition, an inlet temperature of a combustion catalyst is equal to or higher than an activation requirement temperature of the combustion catalyst, and further, an outlet temperature of the combustion catalyst is equal to or higher than an activation confirmation temperature of the combustion catalyst in excess of the inlet temperature of the combustion catalyst. In the second condition, the outlet temperature of the combustion catalyst exceeds a warming confirmation temperature of the combustion catalyst that is set to be higher as an engine speed is lower, for a predetermined period of time.

Exhaust gas processing device for engine

It is an object of the present invention to provide an exhaust gas treatment device of an engine capable of preventing matching surfaces of catalyst portions configuring a combustible gas catalyst from being thermally damaged. In the exhaust gas treatment device, combustible gas is produced by combustible gas generating catalyst, exhaust gas heated by combustion of combustible gas is supplied to an exhaust gas treatment portion, the combustible gas generating catalyst comprises an aggregate of a plurality of catalyst portions, each of the catalyst portions includes a matching surface with respect to adjacent one of the catalyst portions, a fastening ring is fitted over the combustible gas generating catalyst in which the matching surfaces of the adjacent catalyst portions are abutted against each other, and the matching surfaces of the adjacent catalyst portions are brought into tight contact with each other by a fastening force of the fastening ring.

Exhaust gas treatment device of engine

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 exhaust treatment apparatus for an engine including a combustible gas supplying passage; a heat releasing port opened in an upstream side in the exhaust passage from the oxidation catalyst and in a downstream side in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat releasing port; an ignition apparatus beneath the heat releasing port, the heat of flaming combustion of combustible gas ignited by the ignition apparatus being supplied to the exhaust passage to raise the temperature of exhaust in the exhaust passage; a flame holding plate in a downstream side in the combustible gas supplying passage from the ignition apparatus, an exhaust guiding plate at the top portion of the flame holding plate, the exhaust guiding plate having an upward slope toward a downstream side in the exhaust passage.

Exhaust treatment apparatus for engine

A work vehicle includes wheels and a mower unit that are driven by power from an engine, and a mower driving detecting section for detecting power transmission condition to the mower unit. An isochronous controlling section controls the engine in an isochronous control mode for maintaining an engine rotational speed at a predetermined fixed value, independently of an engine load. A droop controlling section controls the engine in a droop control mode for varying the engine rotational speed in dependence on the engine load. If power is transmitted to the mower unit, the isochronous control mode is selected.

Work vehicle with a mower unit

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

An engine comprises a timer (), which is provided with a temperature-sensing operation mechanism (). During a cold-starting term, a downstream interlocking portion () advances by an advancing operation of the timer () based on an operation that the temperature-sensing operation mechanism () makes upon sensing the temperature. While the engine is warm, the downstream interlocking portion () cancels an advancement by an advancement-cancellation operation of the timer () based on another operation that the temperature-sensing operation mechanism () makes upon sensing the temperature. The engine oil () within the engine is supplied from the oil-supply port () to the timer (), thereby enabling the engine oil () in liquid state to contact the temperature-sensing operation mechanism ().

Growing community of inventors

Sakai, Japan

Yoshikazu Takemoto