Patent ID: 8202042

Claim:
A turbine for a turbocharger, comprising: a turbine housing defining a cavity having a radially inwardly facing surface; a piston disposed in the cavity and axially slidable therein, a nozzle being defined between an end of the piston and an opposing fixed wall, the piston being axially slidable to vary a width of the nozzle, the piston having a radially outwardly facing surface, a radial gap being defined between the radially outwardly facing surface of the piston and the radially inwardly facing surface of the cavity; and an axially expandable sealing member having one fixed end attached to the turbine housing and an opposite movable end attached to the piston, wherein the movable end of the sealing member is fit into a recess formed in the radially outwardly facing surface of the piston, the sealing member cutting off a flow of exhaust gas through said radial gap.