Hitachi Construction Machinery Co., Ltd.

Kazuya Kusano

Hitoshi Nishiguchi

Tomonori Mamada

Daiwa Sato

Kunihiko Ikeda

Kenichi Hano

A cooling device includes a casing having a peripheral wall, a plurality of heat exchangers disposed side by side so as to extend transversely in the casing, and a plurality of fans opposed to the plurality of heat exchangers. The casing has a plurality of baffles that extend from the heat exchanger group side toward the cooling fan group side in a space surrounded by the peripheral wall and is arrayed in an arrangement direction of the plurality of heat exchanges. A one side end portion of each baffle is positioned on a boundary between two mutually adjacent heat exchangers or on one of the heat exchangers. The fifth fan is disposed at such a position as to be opposed to one of the plurality of baffles, and other fans are disposed at a position between the peripheral wall and a baffle or between the plurality of baffles.

Multiple fan cooling with specific baffle orientation

A construction machine includes a centrifugal fan, and a bell mouth arranged on the suction side of the centrifugal fan. The centrifugal fan has a rotatable hub, an annular shroud arranged so as to face the hub and having a suction port, and multiple blades provided between the hub and the shroud. An outlet of the bell mouth is arranged on the radially inner side of the suction port of the shroud. Each blade is formed such that: a leading edge has a convex shape protruding toward a suction surface relative to a line segment linking a connection of the leading edge with the hub and a connection of the leading edge with the shroud; and a vertex of the convex shape of the leading edge is positioned on a radially inner side of a wall surface of the outlet of the bell mouth when the suction side of the centrifugal fan is seen in an axis direction.

Growing community of inventors

Tokyo, Japan

Kazuya Kusano