Control device of an exhaust gas guide section of an exhaust gas turbocharger

A control device (8) of an exhaust gas-conducting section (1) of an exhaust gas turbocharger (2), comprising:

• a closing device (9) comprising
• a closing element (10) and
• an element lever (11),
• wherein the closing device (9) can pivot about an axis of rotation (19), and
• wherein the closing element (10) is designed to open and close a first flow cross-section (13) of the exhaust gas-conducting section (1), and
• wherein the first flow cross-section (13) is formed in a partition wall lying between a first spiral channel (4) of the exhaust gas-conducting section (1) and a second spiral channel (5) of the exhaust gas-conducting section (1), and
• wherein the exhaust gas-conducting section (1) comprises a second flow cross-section (17) which is allocated to a bypass duct (18) formed in the exhaust gas-conducting section (1), and
• wherein the bypass duct is designed to bypass a flow against a turbine wheel formed in the exhaust gas-conducting section (1), and
• wherein the closing element (10) comprises
• a first element portion (15) for closing the first flow cross-section (13) and
• a second element portion (16) which can be used to close the second flow cross-section (17), and
• wherein the element lever (11) comprises an arm portion (21) engaging into a cavity (20) of the closing element (10), and
• wherein the cavity (20) comprises an inner surface (23) and the arm portion (21) comprises an outer surface (24) opposite the inner surface (23), and
• wherein an inner peripheral surface (44) of the inner surface (23) and a peripheral surface (31) of the outer surface (24) are identical in form with different dimensions, and
• wherein the peripheral surface (31) comprises at least two different peripheral portions (32, 33), and
• wherein a cavity base (28) of the closing element (10) comprises a groove (40) at least on its base edge (39) which is adjacent to a first peripheral portion (32) of the at least two different peripheral portions (32, 33).

An exhaust gas turbocharger (2), comprising:

• an exhaust gas-conducting section (1), including
• a first flow cross-section (13) formed in a partition wall lying between a first spiral channel (4) and a second spiral channel (5), and
• a second flow cross-section (17) which is allocated to a bypass duct (18) formed in the exhaust gas-conducting section (1), the bypass duct being designed to bypass a flow against a turbine wheel formed in the exhaust gas-conducting section (1);
• and
• a closing device (9) comprising
• a closing element (10) and
• an element lever (11),
• wherein the closing device (9) can pivot about an axis of rotation (19), and
• wherein the closing element (10) is designed to open and close the first flow cross-section (13) of the exhaust gas-conducting section (1), and
• wherein the closing element (10) comprises
• a first element portion (15) for closing the first flow cross-section (13) and
• a second element portion (16) which can be used to close the second flow cross-section (17), and
• wherein the element lever (11) comprises an arm portion (21) engaging into a cavity (20) of the closing element (10), and
• wherein the cavity (20) comprises an inner surface (23) and the arm portion (21) comprises an outer surface (24) opposite the inner surface (23), and
• wherein an inner peripheral surface (44) of the inner surface (23) and a peripheral surface (31) of the outer surface (24) are identical in form with different dimensions, and
• wherein the peripheral surface (31) comprises at least two different peripheral portions (32, 33), and
• wherein a cavity base (28) of the closing element (10) comprises a groove (40) at least on its base edge (39) which is adjacent to a first peripheral portion (32) of the at least two different peripheral portions (32, 33).