A variable geometry turbine, particularly for a supercharger
turbocompressor of an internal combustion engine, comprising an outer
housing forming a spiral inlet channel for an operating fluid, a rotor
supported in a rotary manner in the housing, and an annular vaned nozzle
of variable geometry interposed radially between the channel and the rotor
and comprising a control member moving axially in order to control of the
flow of the operating fluid from the channel to the rotor, the control
member being formed as an annular piston of a fluid actuator actuated
directly by means of a control pressure.
