| 摘要 |
<p>Variable geometry turbochargers (10) comprise a turbine housing (12) having an exhaust gas inlet (14) and outlet (16), a volute connected to the inlet, and a nozzle wall (24) adjacent the volute. A turbine wheel (17) is carried within the turbine housing and is attached to a shaft (18). A plurality of movable vanes (22) are disposed within the turbine housing adjacent the nozzle wall, and are positioned between the exhaust gas inlet and turbine wheel. The turbine housing includes a bypass exhaust gas flow port (102) disposed internally therein having an inlet opening (110) positioned upstream from the turbine wheel, and a outlet opening (112) positioned downstream from the turbine wheel. The vanes are positioned adjacent respective bypass ports with inlet openings covered by a respective vane when the vane is place in a closed position. The inlet opening is exposed for facilitating bypass exhaust gas flow through the turbocharger when the respective vane is actuated or moved into an open position. The turbine housing may also comprise a specially configured nozzle wall terminal edge designed to work with vanes having a recessed underside surface to permit additional bypass exhaust gas flow within the turbocharger when the vanes are actuated in an open position.</p> |
