Engine operated machine system

An engine operated machine system comprising:

• an engine;
• a working machine driven by said engine;
• and
• a waste-heat recovery unit that recovers waste heat emitted by said engine, wherein said engine, said working machine, and said waste-heat recovery unit are accommodated in a box-shaped case,
• wherein said case comprises:
• a partition wall which extends vertically relative to a bottom surface of said case to partition an interior of said case into a working-machine accommodating chamber, which accommodates said engine, said working machine and said waste-heat recovery unit, and an electrical-equipment accommodating chamber;
• the partition wall having a draft bore which connects said working-machine accommodating chamber to said electrical-equipment accommodating chamber at a lower portion of the partition wall;
• a cooling-air intake port which connects said electrical-equipment accommodating chamber to the outside;
• and
• a discharge port for discharging, to the outside, air forcibly discharged from said working-machine accommodating chamber by a fan driven by said engine, and
• wherein said electrical-equipment accommodating chamber has a labyrinth-shaped intake passage defined therein for guiding the air from said cooling-air intake port to an upper portion of said electrical-equipment accommodating chamber and then guides the air to said draft bore.