Exhaust valve device for vehicle

An exhaust valve device for a vehicle in which a valve element is supported to be able to be opened and closed in an exhaust passage by a rotating shaft axially supported by a valve body, a flexible joint member with flexibility is secured to an output shaft of an actuator attached to the valve body, and one end of the flexible joint member and one end of the rotating shaft projecting from the valve body are coupled via a rigid joint member,

• wherein the rigid joint member includes
• a sealing element having a sealing surface and a driven engagement portion, the sealing surface being coupled to the end of the rotating shaft and sealing an axially supported portion of the end of the rotating shaft to prevent exhaust gas from leaking from the exhaust passage through the axially supported portion, the driven engagement portion being formed in a periphery of the sealing surface, and
• a transmission element having a coupling portion and a driving engagement portion, the coupling portion being coupled to the end of the flexible joint member, the driving engagement portion being engaged with the driven engagement portion of the sealing element to restrict relative rotation about an axial line of the rotating shaft, and
• wherein the sealing element of the rigid joint member has a flat plate shape with a plurality of arm portions extending as the driven engagement portion in an outer circumferential direction from the periphery of the sealing surface, and
• the transmission element of the rigid joint member has a cylindrical shape with one end at which the coupling portion is formed and the other end at which a plurality of engagement grooves are formed as the driving engagement portion such that each of the arm portions of the sealing element is fitted to each of the engagement grooves.