Turbine unit and VTG mechanism therefor
AssigneeBorgWarner Inc.
InventorMichael Stilgenbauer
Life of this patent
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Abstract
A turbine unit having a rotor housing (2) having at least one admission channel (9) for a fluid, as well as a turbine rotor (4) which is supported in a turbine space (23) of the rotor housing (2) and wherein fluid is led into the turbine space (23) at its periphery through a VTG mechanism (5-8) of variable turbine geometry. The VTG mechanism (5-8) has a nozzle ring (6) having a plurality of vane shafts (8) which are arranged in the form of a crown on the nozzle ring (6) and which carry on one of their ends vanes (7) which can be moved from a substantially tangential position (relative to the crown) into a substantially radial position, as well as at least one control element (19) in order to pivot the orientation of the vanes (7).
Claims11
A turbine unit for a turbocharger comprising:
- a rotor housing (2) with at least one admission channel (9) for a fluid;
- a turbine rotor (4) which is supported in a rotor space (23) of the rotor housing (2);
- a nozzle ring (6) with a plurality of shafts (8) located on said nozzle ring (6) in a crown formation, and which comprises on one side vanes (7), which are susceptible to being turned from a substantially tangential position into a substantially radial position with respect to said crown, and at least one control lever (19) in order to change the position of the vanes (7);
- an actuation device (11) in order to create control movements which are transmitted to a VTG mechanism (5-8) with variable geometry;
- whereby transmission of the control movements is effectuated by a control ring (5) positioned coaxially with said nozzle ring (6) and adjacent thereto, and which is movably connected with said at least one control lever (19), as well as a guiding and centering device for the control ring (5), which comprises at least one roller (3, 20, 21) which substantially rolls on a roller contact surface (20) of the control ring (5);
- wherein said rollers (3, 20, 21) are arranged between the control ring (5) and a releasably connectable ring (6, 38), wherein said releasably connectable ring is releasably connected with the rotor housing (2), and
- wherein said rollers (3), said control ring (5), said nozzle ring (6), said vanes (7), and a vane orientation mechanism (8, 19) are assembled as a modular unit (26) being inserted into said housing (2) as one piece.
Dependencies are inferred from the claim text.