Patent ID: 8807929

Claim:
A turbine housing for a supercharger, comprising: an inlet opening ( 2 ), a turbine seat ( 5 ) and a race ( 6 ) extending from said inlet opening ( 2 ) to said turbine seat ( 5 ), said race ( 6 ) comprising a first spiral chamber ( 7 ) which mouth into said turbine seat ( 5 ) and a second spiral chamber ( 8 ) which mouth into said turbine seat ( 5 ), wherein the first spiral chamber ( 7 ) and the second spiral chamber ( 8 ) mouth into said turbine seat in parallel with each other in a first angular segment (β) of the turbine seat ( 5 ) and along an entire length of said first angular segment (β), the axial height of the mouth into the turbine seat ( 5 ) of the second spiral chamber ( 8 ) in said first angular segment (β) being bigger in the end of the first angular segment (β) than in the beginning thereof seen in a flow direction (F), and wherein the A/R-ratio of the first spiral chamber ( 7 ) is smaller than the common A/R-ratio of the race when the first spiral chamber ( 7 ) and the second spiral chamber ( 8 ) are considered as having one common cross sectional area.