Exhaust muffler

An exhaust muffler, comprising:

• a muffler main body;
• an exhaust gas induction pipe for inducting exhaust gases into said muffler main body;
• an exhaust gas discharge pipe for discharging the exhaust gases within said muffler main body to the outside;
• and
• a control valve provided within said muffler main body or on said exhaust gas discharge pipe, for controlling the flow of the exhaust gases, said control valve comprising:
• a first tubular body having an exhaust gas inlet opening, at one side thereof, through which exhaust gases flow in an axial direction from said one side toward a second, opposite, side of said first tubular body;
• a second tubular body being fitted to said first tubular body to be movable in the axial direction and having a pressure receiving surface for receiving the pressure of exhaust gases flowing thereinto from said exhaust gas inlet opening, wherein said pressure receiving surface is located at said second side of said first tubular body;
• and
• a spring disposed in an annular gap formed between said first and second tubular bodies, at a portion where said first tubular body is fitted to said second tubular body, for axially biasing said second tubular body towards said one side of said first tubular body,
• said second tubular body defining at least one communication hole in a circumferential surface thereof so that the exhaust gases within said first tubular body flow out of said at least one communicating hole to the outside of said second tubular body, when said second tubular body receives the pressure of the exhaust gases at said pressure receiving surface and axially moves towards the second side against the biasing force of said spring.