Patent ID: 8109715

Claim:
A turbocharger with a variable nozzle assembly having a plurality of cambered vanes positioned annularly around a turbine wheel, each vane being pivotable around a pivot point and being configured to have a leading edge and a trailing edge connected by an outer airfoil surface on an outer side of the vane and an inner airfoil surface on an inner side of the vane, said outer airfoil surface being substantially convex and said inner airfoil surface having a convex section at the leading edge which has a local extreme of curvature and transitions into a concave section towards the trailing edge, characterized in that in a coordinate system in which the origin is the leading edge, the x-axis runs through the trailing edge and the y-axis is normal to the x-axis and runs to the outer side of the vane, said pivot point is located at a position which meets the following expressions: 0.25 <Xp/C< 0.45, and −0.10 ≦Yp/C≦ 0.05, wherein Xp is a distance between the pivot point and the leading edge on the x-axis, C is a distance between the leading edge and the trailing edge, and Yp is a distance between the pivot point and a camberline of the vane on the y-axis, with negative values of Yp representing a pivot point which is more on the inner side of the vane.