Work machine

A work machine, comprising:

• a body;
• an engine in the body;
• an exhaust pipe to allow exhaust gas from the engine to flow through the exhaust pipe;
• and
• an outside air mixing cylinder located downstream of the exhaust pipe and including an upstream end including a flow path with a cross-sectional area larger than a cross-sectional area of a flow path at a downstream end of the exhaust pipe to define an outside air introducing section between an outer circumferential portion of the downstream end of the exhaust pipe and an inner circumferential portion of the upstream end of the outside air mixing cylinder;
• wherein
• the outside air mixing cylinder includes:
• a guiding cylinder section located upstream, including a downstream end, and including a flow path with a uniform cross-sectional area from a starting end of the flow path to a distal end of the flow path;
• and
• an expanding cylinder section continuous with the downstream end of the guiding cylinder section and including a flow path with a cross-sectional area that increases constantly from a starting end of the flow path to a distal end of the flow path;
• the guiding cylinder section includes an exhaust gas guide path to guide exhaust gas from the downstream end of the exhaust pipe in a discharge direction of the exhaust pipe;
• the expanding cylinder section includes a structure to use the cross-sectional area of the flow path thereof that becomes larger in diameter to cause a Coanda effect on the exhaust gas so that the exhaust gas follows an inner surface of the expanding cylinder section;
• and
• the outside air mixing cylinder has a rectangular or substantially rectangular cross section.