US 12,228,038 B2
Variable geometry turbine and turbocharger
Toshimitsu Tanaka, Tokyo (JP); Bipin Gupta, Tokyo (JP); and Nao Taniguchi, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 18/272,676
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Dec. 13, 2021, PCT No. PCT/JP2021/045822
§ 371(c)(1), (2) Date Jul. 17, 2023,
PCT Pub. No. WO2022/158165, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 2021-008254 (JP), filed on Jan. 21, 2021.
Prior Publication US 2024/0301803 A1, Sep. 12, 2024
Int. Cl. F01D 17/16 (2006.01); F01D 9/02 (2006.01)
CPC F01D 17/165 (2013.01) [F01D 9/026 (2013.01); F05D 2220/40 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A variable geometry turbine, comprising:
a turbine rotor;
a scroll passage forming part which forms a scroll passage on an outer peripheral side of the turbine rotor;
an exhaust gas passage forming part which forms an exhaust gas passage for introducing an exhaust gas from the scroll passage to the turbine rotor; and
a variable nozzle unit for adjusting a flow of the exhaust gas in the exhaust gas passage,
wherein the variable nozzle unit includes:
a plurality of nozzle vanes disposed in the exhaust gas passage at intervals in a circumferential direction of the turbine rotor; and
a rotation mechanism part configured to rotate the plurality of nozzle vanes about respective rotation centers,
wherein, when the exhaust gas passage is divided into a near-tongue region in the vicinity of a tongue portion of the scroll passage and a far-tongue region which is a region other than the near-tongue region, the plurality of nozzle vanes includes at least one near-tongue nozzle vane disposed in the near-tongue region and at least one far-tongue nozzle vane disposed in the far-tongue region, and
wherein the at least one near-tongue nozzle vane has, in at least one of a leading edge or a trailing edge of the near-tongue nozzle vane, a notch that is cut out to a greater extent than a leading edge or a trailing edge of the far-tongue nozzle vane.