Nozzle assembly of variable geometry turbocharger

A nozzle assembly of a variable geometry turbocharger, comprising:

• a nozzle ring where a plurality of vanes are rotatable mounted along a circumferential surface thereof;
• a control ring arranged coaxially with the nozzle ring and is relatively rotatable with respect to the nozzle ring;
• a plurality of rollers rotatably mounted to the control ring along a circumferential surface thereof;
• and
• a plurality of operation links, one end of which is rotatably coupled to the control ring and the other end of which is fixed to the vanes through the nozzle ring;
• wherein the one end of the operation link is positioned between adjacent rollers along the circumferential surface of the control ring;
• wherein the control ring is disposed between the nozzle ring and a flat wall of a turbo housing with a predetermined gap from the nozzle ring;
• wherein the control ring has roller shaft protrusions integrally protruding in a predetermined distance and the rollers are formed in a hollow cylindrical shape to be fitted on the roller shaft protrusions;
• wherein the rollers are rotatably arranged between the control ring and the nozzle ring;
• wherein the vanes are fixed to one ends of nozzle rotation shafts disposed through the nozzle ring;
• and
• wherein the other ends of the operation links are fixed to the other ends of the nozzle rotation shafts between the control ring and the nozzle ring.