Hitachi Construction Machinery Co., Ltd.

Osamu Kokuryo

Junya Kawamoto

Yasuhiro Miyahara

Shigehisa Hagura

Katsuhiro Sasaki

Kazuhiko Hiraoka

Tomoyuki Miyata

Hiroshi Tabeta

Akira Saito

Yohei Iwamoto

Daisuke Yamamoto

Disclosed is a construction machine that enables an operator to operate a vehicle width changing control lever while visually confirming positions of crawlers. The construction machine includes a lower track structurewhose left and right crawler track devicesA andB are adapted to change in spatial interval, and an upper swing structureswingably mounted above the lower track structure. The construction machine further includes a hydraulically actuated cylinder for changing vehicle width, disposed between the left and right crawler track devices, the vehicle width changing cylinder changing the interval between the left and right crawler track devices upon supply and discharge of a hydraulic fluid being controlled by a vehicle width changing control valve, and a vehicle width changing control leverdisposed on a left section of a swing body support structurerelative to an operator's seat, the vehicle width changing control lever operating the vehicle width changing control valve.

Construction machine

A cooling fan () generating a cooling air in a suctioning direction, a radiator () provided by facing the cooling fan () and cooling an engine coolant by passage of the cooling air, and an oil cooler () arranged in parallel with the radiator () so as to be in parallel with respect to a flow direction of the cooling air and cooling a hydraulic oil by passage of the cooling air are provided. On a suction side of the cooling air with respect to the radiator () and the oil cooler (), a cooling-air adjusting member () for adjusting a ratio of a cooling air amount to be supplied to the radiator () and a cooling air amount to be supplied to the oil cooler () is provided.

Provided is a working machine, which can release exhaust gas at a position above a counterweight even if no space is secured for the installation of an exhaust pipe on an upperstructure or on an upper wall of the counterweight, and which can suppress heating of the counterweight by exhaust gas. The working machine is provided with a muffler () into which exhaust gas is guided from an engine, and a tailpipe () connected to the muffler (). Defined through a counterweight () is a passage () in which the tailpipe () is inserted. The working machine is further provided with an exhaust pipe holding member () and an exhaust pipe (). The exhaust pipe holding member () is attached to an outer side wall of the counterweight (), and has a passage () which is in communication with the passage () of the counterweight () and in which the tailpipe () is inserted. The exhaust pipe () is disposed and held upright on the exhaust pipe holding member (), and has a lower part, in which the tailpipe () is inserted, and an upper part defining therein an exhaust outlet () through which the exhaust gas guided via the tailpipe () is released.

Work machine

Weight for a construction machine

Growing community of inventors

Koka, Japan

Osamu Kokuryo