Patent ID: 8662969

Claim:
A hybrid working machine, comprising: a crawler type lower traveling body; an upper rotating body rotatably mounted around a vertical axis which is vertical to the ground on said lower traveling body; a working attachment provided on said upper rotating body; hybrid devices mounted on said upper rotating body, said hybrid devices including a power storage device serving as a power source for a generator motor for performing a generator operation and a motor operation, and a controller for controlling charging and discharging operations for said power storage device; and a partition plate, wherein said power storage device and said controller each includes a main body and a casing covering said main body, said power storage device and said controller being arranged so as to overlap each other in an up and down direction, and the partition plate being placed between said respective casings of said power storage device and said controller, wherein an intake port is provided in a first casing of said casings, wherein an exhaust port is provided in a second casing of said casings, wherein a ventilation port is provided in said partition plate to introduce cooling air taken from said intake port in the first casing into the second casing through said ventilation port, and to exhaust the cooling air from said exhaust port, so that said power storage device and said controller are cooled down, wherein an uppermost casing of the first and second casings has an opening at a lower surface thereof, and a lowermost casing of the first and second casings has an opening at an upper surface thereof, wherein a portion of the partition plate is located between the respective openings of the first and second casings, and wherein the ventilation port is formed at a position where the openings of the first and second casings overlap each other to provide communication between the first and second casings through the ventilation port.