US Patent 11459907 Variable capacity turbocharger

A variable capacity turbocharger may include a turbine housing, a variable capacity mechanism, and a cover. The turbine housing may include a scroll flow path, a cylindrical portion having a shroud surface facing blades of a turbine impeller, and an exhaust gas outlet flow path. The variable capacity mechanism may be attached to the turbine housing and may include a first plate and a second plate facing each other, and a plurality of variable nozzle vanes disposed between the first plate and the second plate. The cover may be disposed outside the cylindrical portion in a radial direction to face the second plate in an axial direction and to form a part of the scroll flow path. The cover may be attached to the turbine housing such that a gap is formed between the cover and the second plate.