Patent ID: 7955047

Claim:
Variable geometry turbine comprising a housing ( 22 ), a turbine rotor ( 4 ), a fluid inlet ( 1 ) that surrounds said turbine rotor, a vaned nozzle interposed between said fluid inlet and said turbine rotor conceived to accelerate the flow of fluid, said nozzle comprising an axially adjustable ring ( 25 ) conceived to vary the nozzle gap ( 23 ) and having a wall ( 19 ) axially delimiting said nozzle gap, said wall having vanes ( 27 ) and balance holes ( 26 , 26 ′), the balance holes ( 26 , 26 ′) being interposed between said vanes ( 27 ) and connecting said nozzle gap with a chamber ( 12 ) delimited by said housing and said ring, wherein the edges ( 16 ), formed by said holes with the surface ( 18 ) of said wall facing said nozzle gap, are rounded off in the portion ( 17 , 17 ′) located downstream the hole with respect to the fluid flow.