Air-cooled type cooling system for engine working machine assembly

In an air-cooled type cooling system for an engine working machine assembly including;

• a casing, an air-cooled engine, a working machine, a centrifugal cooling fan, an exhaust muffler of the engine and a muffler cover thereof;
• said casing comprising a machine area and a fan area partitioned therewithin,
• said machine area comprising said engine, said working machine and said muffler cover, said exhaust muffler being accommodated within the muffler cover through a muffler cooling air passage;
• said fan area being provided with a centrifugal cooling fan;
• a ventilation inlet in said machine area, an air suction opening in said fan area facing said machine area, an exhaust air outlet passage and an exhaust air conduction passage extending in parallel from the periphery of said fan room;
• the outlet of said exhaust air outlet passage being in communication with the atmosphere, and the outlet of said exhaust air conduction passage being in communication with the muffler cooling air passage within the muffler cover.