Patent ID: 7886536

Claim:
An exhaust-gas turbocharger ( 1 ) including a guide apparatus ( 13 ) with a ring of guide vanes ( 8 ) pivoting on a vane bearing ring ( 12 ) by vane studs ( 18 ), the vane studs ( 18 ) each connected with a vane lever ( 11 ), the vane levers ( 11 ) comprising vane—lever connectors ( 17 , 10 , 46 , 47 ), which interact with unison ring connectors ( 16 , 10 , 57 ) of a flat unison ring ( 9 ) which is pivotable with respect to the vane bearing ring ( 12 ) in a way, that pivoting the unison ring ( 9 ) with respect to the vane bearing ring ( 12 ) results in a synchronous movement of the vane levers ( 11 ) and the guide vanes ( 8 ), the unison ring ( 9 ) being radially supported on axial bosses ( 14 ) of one or more of the vane levers ( 11 ), wherein of the vane lever connectors comprises a lever stud ( 17 ) engaging with a sliding block ( 10 ), wherein the unison ring defines a radially oriented recess—( 16 ) for each of the vane lever connectors, wherein each of the sliding blocks ( 10 ) is movable with the radially oriented recess ( 16 ), and wherein each of the plurality of radially oriented recesses of the unison ring is open towards a radially outward direction, wherein at least three lever studs ( 17 ) have a disc ( 24 ) which encloses a corresponding sliding block ( 10 ) from one side and which abuts the unison ring ( 9 ) in proximity to the corresponding recess ( 16 ).