Patent ID: 7798770

Claim:
A turbine wheel in an exhaust gas turbine ( 3 ) of an exhaust gas turbocharger ( 2 ), said turbine wheel ( 12 ) having a hub ( 13 ) and a plurality of turbine wheel blades ( 15 ) arranged on the turbine wheel hub ( 13 ) and extending axially between a radial turbine wheel inlet area ( 16 ) and an axial turbine wheel outlet area ( 17 ), the turbine wheel blades ( 15 ) having the greatest external diameter (D) in the region of the turbine wheel inlet area ( 16 ), an end wall ( 20 ) adjacent to the turbine wheel inlet area ( 16 ) of the turbine wheel ( 12 ) extending radially as far as the greatest external diameter (D) of the turbine wheel blades ( 15 ) and the turbine wheel blades ( 15 ) being constructed in such a way that the ratio of the hub contour thickness (d n ) to the external contour thickness (d a ) of each turbine wheel blade ( 15 ) in the axial half facing the turbine wheel outlet ( 17 ) of the turbine wheel ( 12 ) follows the function d n/d a >8 for x/l ax >0.5, wherein d n designates the hub contour thickness of turbine wheel blade ( 15 ), d a designates the external contour thickness of a turbine wheel blade ( 15 ), x designates the current axial position starting from the end wall, adjacent to the turbine wheel inlet ( 16 ) of the turbine wheel ( 12 ), and l ax designates the axial overall length of the turbine wheel ( 12 ), each turbine wheel blade ( 15 ) having a thickness (d) between a hub contour ( 18 ) and an external contour ( 19 ) which follows the function d=d a +( d n - d a )( h/h N ) ex , wherein d designates the current blade wheel thickness h designates the current radial position in the region of the turbine wheel blade ( 15 ) starting from the external diameter and extending radially inwards, h N designates the radial extent between the turbine wheel hub ( 13 ) and external diameter, and ex designates an exponent in the range 1≦ex≦2.