Komatsu Corporation

Takanori Hata

Hiroshi Yamashita

Satoru Nishimura

Takumi Nagahara

Kazuyoshi Morimoto

Huzhe Yang

Gary Ryan

An exhaust processing unit includes a selective catalytic reduction apparatus which processes exhaust from an engine. A reducing agent injection apparatus is attached to the exhaust processing unit. The reducing agent injection apparatus injects a reducing agent which is supplied to the selective catalytic reduction apparatus. The reducing agent tank and the reducing agent supply pump are arranged outside the engine compartment. The reducing agent tank retains the reducing agent. The reducing agent supply pump supplies the reducing agent from the reducing agent tank to the reducing agent injection apparatus. The reducing agent pipe connects the reducing agent supply pump and the reducing agent injection apparatus. The revolving frame includes a pipe frame. The reducing agent pipe is arranged from the reducing agent supply pump to the reducing agent injection apparatus so as to pass through the inner space of the pipe frame.

Hydraulic excavator

Various work machines in which safety of operation and operation efficiency can be enhanced in accordance with variation in the kind of operation and operation condition when operation is carried out based on a previously set operation mode of an operation machine, and operation speed of the operation machine or running speed of the work machine can finely be adjusted is provided. The work machine comprises mode switching means having a mode switching switch and the like of operation modes of one or more operation machines. A speed finely-adjusting switch is disposed for finely adjusting an operation speed and/or a running speed to values out of range set in each mode by manual operation. An engine, a pump, a flow rate adjusting valve disposed in a driving circuit of one or more operation machine and running motor and the like are operated by a signal output by operating the speed finely-adjusting switch, and the engine revolution number and the pump discharge amount are adjusted. Even under an environment in which operation range is changed or an obstruction may exist, it is possible to effectively obtain optimal operation mode of the operation machine suitable for the kind of operation which is carried out and operation condition and skill of an operator, and stable running performance and operability of the operation machine can be realized.

Work machine including finely adjustable operation modes

Growing community of inventors

Hirakata, Japan

Takanori Hata