Abstract: An exhaust turbocharger equipped with a nozzle throat area varying mechanism can be provided in which brazing welding is achieved with a small number of man-hour and at low cost, and which is stable in quality without danger of fracture of brazing-welded parts of constituent members. The variable-throat exhaust turbocharger equipped with a nozzle throat area varying mechanism for varying the blade angle of a plurality of nozzle vanes supported rotatably by members including turbine casing, is characterized in that members having at least one through-hole with at least one shaft member to be inserted into the through-hole(s) to be fixed therein among constituent members of the nozzle throat area varying mechanism are connected by means of brazing welding.

Abstract: The present invention provides a variable-throat exhaust turbocharger equipped with a variable-throat mechanism of which connection of constituent members can be achieved with a small number of man-hour and at low cost and which is stable in quality with firm connection of constituent members maintained under severe operating conditions. Among constituent members of the variable throat-area mechanism of the variable-throat exhaust turbocharger for varying the blade angle of a plurality of nozzle vanes supported rotatably by a members in a turbine casing, shaft members to be inserted and fixed in through-holes in a member with through-holes are produced by a method in which wear-resistant material is welded to form cladding of a certain thickness on the upper surface of a steel plate, said material being harder than the steel plate, and then crude shafts for forming drive pins are cut out from the clad plate.

Abstract: The present invention provides a variable-throat exhaust turbocharger equipped with a variable-throat mechanism of which connection of constituent members can be achieved with a small number of man-hour and at low cost and which is stable in quality with firm connection of constituent members maintained under severe operating conditions. Among constituent members of the variable throat-area mechanism of the variable-throat exhaust turbocharger for varying the blade angle of a plurality of nozzle vanes supported rotatably by a members in a turbine casing, shaft members to be inserted and fixed in through-holes in a member with through-holes are produced by a method in which wear-resistant material is welded to form cladding of a certain thickness on the upper surface of a steel plate, said material being harder than the steel plate, and then crude shafts for forming drive pins are cut out from the clad plate.

Abstract: An exhaust turbocharger equipped with a nozzle throat area varying mechanism can be provided in which brazing welding is achieved with a small number of man-hour and at low cost, and which is stable in quality without danger of fracture of brazing-welded parts of constituent members. The variable-throat exhaust turbocharger equipped with a nozzle throat area varying mechanism for varying the blade angle of a plurality of nozzle vanes supported rotatably by members including turbine casing, is characterized in that members having at least one through-hole with at least one shaft member to be inserted into the through-hole(s) to be fixed therein among constituent members of the nozzle throat area varying mechanism are connected by means of brazing welding.