Variable-capacity turbocharger

A variable-capacity turbocharger comprising:

• a turbine impeller;
• a scroll flow passage;
• a nozzle flow passage connecting the scroll flow passage and the turbine impeller, the nozzle flow passage including a first flow passage face and a second flow passage face;
• a connecting pin connecting the first flow passage face and the second flow passage face;
• and
• nozzle vanes arranged in a rotation direction of the turbine impeller,
• wherein the first flow passage face includes:
• an inner face portion extending radially inward of a first reference line extending in the rotation direction, the inner face portion being inclined to extend away from the second flow passage face;
• and
• an outer face portion extending radially outward from a second reference line, the outer face portion extending orthogonal to rotation axes of the nozzle vanes and parallel to the second flow passage face, and the second reference line extending in the rotation direction and radially outward from the first reference line,
• wherein the first reference line is located radially inward of a first inner circumferential contact circle of the nozzle vanes at a first state in which the nozzle vanes are positioned at a maximum opening of the nozzle flow passage,
• wherein the second reference line is located radially inward of a first outer circumferential contact circle of the nozzle vanes at the first state, is located radially outward from a second inner circumferential contact circle of the nozzle vanes at a second state in which the nozzle vanes are positioned at a minimum opening of the nozzle flow passage, and is located radially inward of a third inner circumferential contact circle of the connecting pin, and wherein a first gap between the inner face portion and the second flow passage face is wider than a second gap between the outer face portion and the second flow passage face.

A variable-capacity turbocharger comprising:

• a turbine impeller;
• a scroll flow passage;
• a nozzle flow passage connecting a scroll flow passage and a turbine impeller, the nozzle flow passage including a first flow passage face and a second flow passage face;
• a connecting pin connecting the first flow passage face and the second flow passage face;
• and
• nozzle vanes arranged in a rotation direction of the turbine impeller,
• wherein the first flow passage face includes:
• an inner face portion extending radially inward of a reference line extending in the rotation direction, the inner face portion being inclined to extend away from the second flow passage face;
• and
• an outer face portion extending radially outward from the reference line, the outer face portion extending orthogonal to rotation axes of the nozzle vanes and parallel to the second flow passage face,
• wherein the reference line is located radially inward of an outer circumferential contact circle of the nozzle vanes at a first state in which the nozzle vanes are positioned at a maximum opening of the nozzle flow passage, is located radially outward from an inner circumferential contact circle of the nozzle vanes at a second state in which the nozzle vanes are positioned at a minimum opening of the nozzle flow passage, and is located radially inward of an inner circumferential contact circle of the connecting pin,
• wherein a first gap between the inner face portion and the second flow passage face is wider than a second gap between the outer face portion and the second flow passage face.