Exhaust valve structure

An exhaust valve structure comprising:

• a cylindrical member that is configured to form a passage of exhaust gas and to have a valve seat portion;
• a valve element that is configured to close or open the passage;
• and
• a wire mesh that is configured to be fixed to the valve seat portion and to contact the valve element when the passage is closed, wherein
• the valve element has an outer peripheral surface portion that contacts the wire mesh when the passage is closed,
• the wire mesh is formed in a shape such that a diameter of the wire mesh gradually increases toward a downstream side of the passage,
• the wire mesh is formed of a cylindrical fixing portion that is fixed to the valve seat portion and a contact portion that is integrally formed with the fixing portion and that contacts the valve element to receive a load from the valve element when the passage is closed,
• the valve seat portion has a cylindrical mesh support portion to which the fixing portion is fixed and a bent portion that is bent radially outward with respect to the mesh support portion and that retains the contact portion,
• the contact portion has an inner peripheral surface portion that contacts the outer peripheral surface portion when the passage is closed and a deformable surface portion that is formed at an end in a diameter-increasing direction in which the diameter of the wire mesh increases, and
• the inner peripheral surface portion is inclined radially inward with respect to the bent portion.