Patent ID: 11946377
Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A variable nozzle device for a variable geometry turbocharger, comprising:
a nozzle mount;
a nozzle plate disposed so as to face the nozzle mount, the nozzle plate forming a nozzle flow passage having an annular shape between the nozzle plate and the nozzle mount; and
a plurality of variable nozzle vanes disposed at a predetermined interval in a circumferential direction of the nozzle flow passage so as to be individually rotatable about a pivot axis,
wherein the nozzle plate includes a first surface facing the nozzle mount, a second surface opposite to the first surface, and at least one through hole formed through the first surface and the second surface,
wherein the at least one through hole has a first opening formed on the first surface at an inner side of the pivot axis with respect to a radial direction, and a second opening formed on the second surface at an outer side of the first opening with respect to the radial direction or at the same position as the first opening with respect to the radial direction, and
wherein the at least one through hole is formed such that the first opening of the nozzle plate has a smaller opening area than the second opening of the nozzle plate.