WASTEGATE VALVE AND EXHAUST GAS TURBOCHARGER EQUIPPED WITH WASTEGATE VALVE

摘要

It is intended to provide a wastegate valve which can achieve even and stable seating of the valving element on the valve seat and which can suppress vibration of the valving element, as well as a exhaust gas turbocharger equipped with such wastegate valve. A valving element 13 opens and closes an exhaust gas bypass path, a valve stem 17 stands upright from the valving element 13, an operating lever 15 has one end formed with an insertion hole 29 where the valve stem 17 is inserted with play, a support plate 31 is provided on one end of the valve stem opposite to the other end which is inserted through the insertion hole, and a spring member 19 is provided between the support plate 31 and the operating lever 15 in an axial direction of the valve stem to suppress vibration of the valving element. The spring member 19 has a large-diameter part and at least two small-diameter parts with a diameter smaller than the large-diameter part in a space between the support plate and the operating lever in the axial direction, the large-diameter part and the at least two small-diameter parts being arranged concentrically with an axial center of the valve stem, and a pair of the at least two small-diameter parts constitute a first contact part 35 where the damping member contacts an operating lever side and a second contact part 37 where the damping member contacts a support plate side respectively, the pair of the at least two small-diameter parts being respectively disposed at both ends of the damping member in the axial direction.