Patent ID: 7490470

Claim:
A method for manufacturing a variable-throat exhaust turbocharger having a nozzle throat area varying mechanism and a turbine casing within which a plurality of nozzle vanes are disposed and also having a plurality of members rotatably supporting the plurality of nozzle vanes, the plurality of members including a member having at least one through-hole and also including at least one shaft member, the method comprising: forming a conically tapered portion at an entrance of the at least one through-hole; putting a piece of solder on the tapered portion; inserting the at least one shaft member into the through-hole with an interference provided between the at least one shaft member and the member having the at least one through-hole; heating the integrated member formed of the at least one shaft member and the member having at least one through-hole in a vacuum furnace to a temperature of 1000-1100 degrees Celsius such that the piece of solder infiltrates into a small clearance between the member having at least one through-hole and the shaft member; and cooling the integrated member slowly to thereby firmly fix the at least one shaft member to the member having at least one through-hole.