| 摘要 |
<p>[Problem] To provide a variable geometry turbocharger provided with a variable displacement mechanism in which the sliding part has a structure simplified compared with conventional ones. [Solution] This variable geometry turbocharger is provided with a turbine rotor (26) which comprises a rotation shaft (24) and a turbine wheel (12), a bearing housing (20) which houses a bearing device (22), a turbine housing (10) which rotatably houses the turbine wheel and in which an annular exhaust scroll unit (16) is formed through which exhaust gas flows, and a variable displacement mechanism (40) which is arranged inside of an annular nozzle unit (18) which guides into the turbine wheel the exhaust gas flowing through the exhaust scroll unit, wherein the variable displacement mechanism (40) includes a nozzle vane (42) which protrudes in an unrotatable state from the shroud side and/or the hub side of the nozzle unit towards the nozzle unit, an annular nozzle wall (44) which is configured so as to retract and advance freely from the hub side of the nozzle unit towards the shroud side, or from the shroud side towards the hub side and which can change the nozzle width B of the nozzle unit along the entire circumference, and a drive means (46) which advances and retracts the nozzle wall.</p> |
