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A variable geometry system for a turbocharger includes a sliding piston disposed within a turbine housing between a primary exhaust gas volute and turbine blades. The sliding piston is axially displaceable within the turbine housing to increase or decrease the volumetric flowrate of exhaust gas to t

A variable geometry system for a turbocharger includes a sliding piston disposed within a turbine housing between a primary exhaust gas volute and turbine blades. The sliding piston is axially displaceable within the turbine housing to increase or decrease the volumetric flowrate of exhaust gas to the turbine. The sliding piston is positioned by an actuator having reciprocating movement translated through a rotating sleeve with a first pin engaging a helical slot for axial motion of the piston and a second pin engaging an alignment slot for maintaining axial alignment of the piston.

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[ What is claimed is:] [1.] A turbocharger for internal combustion engines comprising:a turbine housing having an exhaust-gas volute and ar exhaust-gas flow path in communication with the volute and extending radially inwardly into the housing;an exhaust-gas turbine rotatably mounted within the hous

[ What is claimed is:] [1.] A turbocharger for internal combustion engines comprising:a turbine housing having an exhaust-gas volute and ar exhaust-gas flow path in communication with the volute and extending radially inwardly into the housing;an exhaust-gas turbine rotatably mounted within the housing and in gas flow communication with the exhaust gas flow path;a sliding piston disposed concentrically within the housing having at least a portion thereof positioned within the exhaust gas flow path, the sliding piston including:a helical slot extending laterally along a piston outside diameter surface; andan alignment slot extending axially along the piston outside diameter surface;a ring housing fixedly attached to an outside surface of the housing and having a ring groove along an inside diameter surface, the ring housing including an alignment pin projecting outwardly therefrom towards the sliding piston and disposed within the alignment slot;a rotating ring extending concentrically around the outside diameter surface of the sliding piston and disposed within the ring groove, the rotating ring having a driving pin projecting outwardly therefrom towards the sliding piston and disposed within the alignment slot; andactuating means for rotating the rotating ring within the turbine housing, wherein said rotating causes the sliding piston to be moved axially within the turbine housing by engagement of the driving pin within the helical slot to regulate exhaust gas flow through the exhaust gas flow path, and wherein rotation of the sliding piston within the turbine housing is prevented during said rotating by engagement of the alignment pin within the alignment slot.