Patent ID: 8904785

Claim:
An assembly comprising: a turbine housing that comprises a bore that defines a bore axis, a wastegate seat and a wastegate passage that extends to the wastegate seat wherein the wastegate seat comprises a conical portion with a profile defined by a portion of a cone that defines a wastegate seat axis; a bushing received by the bore wherein the bushing defines a bushing axis; a rotatable wastegate shaft that defines a wastegate shaft axis, the rotatable wastegate shaft received by the bushing wherein the rotatable wastegate shaft comprises a shaft end and a shoulder; a control arm coupled to the wastegate shaft wherein the bushing is disposed between the shoulder of the wastegate shaft and the control arm with an axial clearance; an actuator coupled to the control arm; a wastegate arm extending from the wastegate shaft; and a wastegate plug extending from the wastegate arm wherein the wastegate plug comprises a toroidal portion with a profile defined by a portion of a torus that defines a wastegate plug axis wherein the toroidal portion contacts the conical portion of the wastegate seat responsive to force applied by the actuator to the wastegate shaft via the control arm that angularly displaces the wastegate shaft axis with respect to the bore axis and the bushing axis, that axially displaces the wastegate shaft with respect to the bore and that forcibly seats the toroidal portion of the wastegate plug with respect to the conical portion of the wastegate seat wherein the force acts to reduce misalignment of the wastegate plug axis and the wastegate seat axis.