Variable geometry turbocharger

A variable geometry turbocharger, comprising:

• a turbine rotor;
• a turbine housing which accommodates the turbine rotor and which forms a scroll flow passage on a radially outer side of the turbine rotor;
• a bearing housing accommodating a bearing which rotatably supports the turbine rotor, the bearing housing being coupled to the turbine housing;
• and
• a variable nozzle mechanism for adjusting a flow of exhaust gas to the turbine rotor from the scroll flow passage,
• wherein the variable nozzle mechanism includes:
• a nozzle vane disposed in an exhaust gas flow passage for guiding the exhaust gas from the scroll flow passage to the turbine rotor;
• a nozzle mount having an annular shape and supporting the nozzle vane rotatably, the nozzle mount forming a flow passage wall on a bearing-housing side of the exhaust gas flow passage;
• and
• a nozzle plate having an annular shape and being disposed so as to face the nozzle mount, the nozzle plate forming a flow passage wall, of the exhaust gas flow passage,
• a plurality of bolts disposed at intervals in a circumferential direction of the turbine rotor and configured to fasten the turbine housing and the bearing housing in the axial direction,
• wherein the bearing housing includes a bearing-housing side support portion configured to support a radially outer portion of the nozzle mount from a side opposite to the scroll flow passage in an axial direction of the turbine rotor,
• wherein the bearing-housing side support portion includes at least one bearing-housing side recess portion formed so as to be recessed toward a side opposite to the nozzle mount in the axial direction,
• wherein the at least one bearing-housing side recess portion includes a plurality of bearing-housing side recess portions disposed at intervals in a circumferential direction of the turbine rotor, and
• wherein the bearing-housing side recess portion is formed in an angular range which does not overlap with a center position of a bolt adjacent to the bearing-housing side recess portion, of the plurality of bolts, in the circumferential direction.