Honeywell International Inc.

Laurent Vautier

Alain Rene Lombard

Marylene Ruffinoni

Valerie Bribant

Sebastian Ferrari

A turbocharger having a variable nozzle with stepped two-stage vanes (), the variable nozzle comprising a tubular piston () disposed in the bore () of the turbine housing () such that the piston () is axially slidable adjacent to the vanes () that extend across the nozzle. Each vane defines a first vane stage () proximate the free end of the vane, the second vane stage () having a different aerodynamic contour in comparison with the first vane stage (), each vane comprising a step () transitioning from the first vane stage () to the second vane stage (). The piston () in a closed position closes the second vane stage () so that exhaust gas flows only through the first vane stage (). The second vane stage () is progressively opened as the piston () is axially slid toward an open position.

Turbocharger with stepped two-stage vane nozzle

A turbocharger having a sliding piston assembly comprising a tubular piston disposed in the bore of the turbine housing such that the piston is axially slidable relative to the turbine housing. The piston assembly further comprises a tubular carrier inserted axially into the bore of the turbine housing surrounding the piston and fixed against axial movement relative to the turbine housing, a radially outer surface of the carrier engaging an inner surface of the bore and a radially inner surface of the carrier being slidably engaged by a radially outer surface of the piston. The carrier defines an axial split extending a length of the carrier, and the carrier is resiliently flexible. Accordingly, the axial split allows the carrier to expand and contract in diameter.

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Tendon, France

Laurent Vautier