Sector-Divided Turbine Assembly With Axial Piston Variable-Geometry Mechanism

摘要

A turbine ( 40 ) for a turbocharger ( 10 ) has a turbine housing ( 41 ) defining a generally annular chamber ( 43 ) surrounding a turbine wheel ( 44 ), the chamber receiving exhaust gas for driving the turbine wheel. The chamber has dividing walls ( 46 ) that divide the chamber into a plurality of angular sectors ( 43 a, 43 b), each fed with exhaust gas separately from the other sector(s). ( 52,53 ) located radially inwardly of the sectors for guiding flow into the turbine wheel include at least dividing vanes ( 52 ) that form extensions of the dividing walls ( 46 ) so as to extend the sector-division of the exhaust gas flow path all the way to the trailing edges of the dividing vanes. An axially slidable piston ( 48 ) is disposed radially inwardly of the sectors, and radially overlaps with the dividing vanes ( 52 ). The vanes either are mounted on fixed structure and are received in slots ( 49 ) in the piston, or are mounted on the piston and received in slots in fixed structure.