Hitachi Construction Machinery Co., Ltd.

Masao Kariya

Genroku Sugiyama

Kazuhiko Mizoguchi

Atsushi Ninomiya

Shigehisa Hagura

Tsukasa Toyooka

Hiroshi Kumagai

Hiroki Sugawara

Hayato Kubota

Yasuhiko Yoshino

Takuya Inukai

Excavator

A urea water tank () is formed as a box body that includes a rear inclined surface (A) that inclines so as to be parallel with a left inclined surface (C) of a counterweight (), a front inclined surface (B) that inclines with a space being left apart from the rear inclined surface (A) and in substantially parallel with the rear inclined surface (A) and a front surface (C) that is formed on front ends of the rear inclined surface (A) and the front inclined surface (B) and is formed into a flat surface that is parallel with a left-right direction of an upper revolving body (). The rear inclined surface (A) of the urea water tank () is disposed along and facing the left inclined surface (C) of the counterweight () and the front inclined surface (B) is disposed with a gap being left apart from and facing the heat exchanger (). A cooling air guide passage () through which cooling air flows is formed between the heat exchanger () and the front inclined surface (B) of the urea water tank ().

Construction machine

A construction machine according to the present invention includes electric componentsand a cover member, and includes an inflow side openingthat allows cooling air generated by the cooling fanto flow therein, and an outflow side openingthat allows the cooling air flowing in from the inflow side openingto flow out, in which the cover memberis formed such that the inflow side openingexpands toward an upstream side of a flow of the cooling air with respect to a space formed between the cover memberand the post-treatment device, and having the electric componentstherein, and a space between the post-treatment deviceand the cover membernarrows from the inflow side openingtoward the outflow side opening

Pipe breakage control valve device

An input/output port of a hose rupture control valve unit is attached to a bottom port of a hydraulic cylinder , and an input/output port is connected to one of actuator ports of a control valve via an actuator line . The valve unit comprises a poppet valve body serving as a main valve, a first spool valve body serving as a pilot valve operated with a pilot pressure supplied as an external signal and having a pilot variable throttle portion to operate the poppet valve body , a second spool valve body operated with a pilot pressure and having a sub-variable throttle portion to control a sub-flow rate, and a small relief valve having the function of an overload relief valve.

Growing community of inventors

Ibaraki, Japan

Masao Kariya