WASTEGATE BALL-VALVE

摘要

A turbocharger (10) has an improved wastegate valve assembly (32) wherein a valve member (35) moves freely within a lever arm (34A), and therefore, is displaceable sidewardly across the opening (28) of the wastegate port (28). The valve member (35) and associated seat (36) respectively have male and female forms so as to sealingly engage with each other when the valve body (35) is in the closed position. As such, the valve member (35) can move freely as it engages the seat (36) to provide a tight uniform seal therebetween. Additionally, the seat (36) may be formed as an insert which fits within the wastegate port (28) and is also free floating in the direction extending across the port (28) which further assists in self-centering of the valve member (35) and seat (36).

主权项

1. A turbocharger having a wastegate valve (32) and a wastegate port (28), said wastegate valve (32) comprising:
a valve seat (36, 95) which surrounds said wastegate port (28) and defines a sealing surface (38); a valve body (34) which is movable toward and away from said wastegate port (28), said valve body (34) including a free-floating valve member (35, 61) which is sealingly engagable with said valve seat (36, 95) when said valve body (34) is in a closed position, said valve member (35, 61) being movably retained on said valve body (34) so as to be movable in radial directions extending radially across said valve port (28) to allow self-centering of said valve member (35, 61) within said seat (36, 95).