Patent ID: 7107943
Filing Date: 2006-09-19
Classification: F01P,F02B

Abstract:
1. A soundproof engine-driven operating machine comprising: an engine; an operating machine main body driven by the engine; a base frame supporting the engine and the operating machine main body in a vibration-proof structure; a case fitted to the base frame and accommodating the engine and the operating machine main body; part of the case including a first-story chamber accommodating the engine and the operating machine main body, first and second heat exchangers, each having a cooling fan and being arranged above the first-story chamber, the first and second heat exchangers performing heat conversion relating to the operation of the engine by using the cooling fans, arranged separately in a ventilation path, and a second-story chamber accommodating a muffler for discharging engine air, the part of the case being comprised from a structural frame provided on the base frame; the first-story chamber and the second-story chamber being connected by a ventilation path supplying cooling wind for the second heat exchanger from the first-story chamber; the second-story chamber having a ventilation path discharging cooling winds, passing through the first and second heat exchangers and cooling the muffler, to the outside.