Komatsu Corporation

Hiroshi Ohta

Hiroshi Nakagami

Taira Ozaki

Kanji Namimatsu

Hironori Yamamitsu

Kenji Matsubara

Shuki Akushichi

Takashi Sakasai

Takanobu Akutsu

An exhaust gas treatment unit includes an exhaust gas treatment device, a bracket and a connecting pipe. The exhaust gas treatment device is mounted on a bracket. The connecting pipe is connected to the exhaust gas treatment device. The connecting pipe directs exhaust gas to the exhaust gas treatment device. The connecting pipe may include a supporting portion and a pipe portion, with the supporting portion supporting the bracket and the pipe portion being integrated with the supporting portion. Alternatively, the exhaust gas treatment unit may further include a supporting member having a supporting portion supporting the bracket and a pipe portion integrated with the supporting portion, with the pipe portion connected to the connecting pipe.

Exhaust gas treatment unit

An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.

Engine unit

In a fuel injection apparatus , a fuel injection rate from which is controlled by a fuel pressure, a branch pipe comprising a tubular member with the tip end closed is provided between a second pressure control valve and a second pressure sensor . The branch pipe extends in a direction along a flow direction of the fuel just before the branch pipe , and has a capacity not less than one fifth of that of a fuel flow path between the second pressure control valve and a fuel chamber . When a pressure difference in the pressure control valve becomes larger and vibration of the fuel pressure is generated, the branch pipe absorbs and reduces the vibration. As the vibration of the fuel pressure is reduced, a stable fuel injection rate is realized.

Fuel injection apparatus

Growing community of inventors

Sano, Japan

Hiroshi Ohta