Variable geometry turbocharger

A variable geometry turbocharger comprising:

• a turbine housing having an inlet for exhaust gas and an outlet, a volute connected to the inlet and an integral outer nozzle wall adjacent the volute;
• a center housing attached to the turbine housing and having a center bore carrying a bearing assembly;
• a compressor housing having an air inlet and a compressed air outlet the compressor housing attached to the center housing;
• a turbine wheel carried within the turbine housing and attached to a shaft extending through the center housing, supported by the bearing assembly, the shaft attached distal the turbine wheel to a compressor impeller carried within the compressor housing;
• a plurality of vanes having rotation posts extending form a first surface substantially parallel to the outer nozzle wall, the posts received in circumferentially spaced apertures in the outer nozzle wall, the vanes further having actuation tabs extending from a second surface of the vanes distal the first surface;
• a unison ring intermediate the center housing and the vanes, the unison ring having a plurality of slots equal in number to the vanes, said slots oriented obliquely to a circumference of the incision ring and receiving the tabs, the unison ring further having a radial slot;
• a crank shaft having a pin engaging the radial slot, the crank shaft movable continuously from a first position to a second position, movement of the crank shaft causing the pin to translate in the radial slot and impart force perpendicular to the radial slot to urge rotational motion of the unison ring, the rotational motion of the unison ring causing the tabs to traverse the actuation slots from a first end of the slots to the second end of the slots;
• and
• means for moving the crank shaft from the first position to the second position.