초록 ▼

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 v

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).

대표청구항 ▼

The invention claimed is: 1. 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

The invention claimed is: 1. 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. 2. The turbine unit according to claim 1, comprising at least one of the following: a) the rollers (3, 20, 21) are cylinder bearings; b) the releasably connectable ring is the nozzle ring (6); c) the modular unit (26a) further comprises a fastening ring (29) which is positioned opposite to the vanes (7) on the rotor housing (2) and fastened therewith, and is connected with the nozzle ring (6). 3. The turbine unit according to claim 1, wherein the rollers (3, 20, 21) are housed in an axially open free space (5"), and wherein the free space (5") is closed by a holding ring (22), wherein said holding ring (22) comprises axial extensions (24) of the rollers (3), wherein the rollers (3) are held by the holding ring (22) at a certain distance from one another. 4. The turbine unit according to claim 1, wherein a plurality of control levers (19) are fastened on the shafts (8) on a side of the nozzle ring (6) that is opposite to the vanes (7), wherein said plurality of control levers (19) extend approximately radially, and wherein each of the plurality of control levers (19) has a free end (18). 5. The turbine unit according to claim 1, wherein a diameter of the control ring (5) and a diameter of the releasably connectable ring (6) which cooperate with the rollers (3, 20, 21) are of a dimension to allow a certain radial play P of the rollers (3) at all operation temperatures. 6. The turbine unit according to claim 1, wherein the modular unit (26, 26a), the control ring (5), the rollers (3, 20, 21) and the releasably connectable ring (6) are held together in non-rotatable fashion through inter-engaging projections and depressions (33). 7. The turbine unit according to claim 1, wherein at least one seal groove (28) is arranged between the rollers (3, 20, 21) and an admission channel (9). 8. The turbine unit according to claim 1, wherein a roller contact surface (21) of the releasably connectable ring (6, 38) has a smaller diameter than the roller contact surface (20) of the control ring (5). 9. The turbine unit according to claim 8, further comprising at least one of: the rollers (3, 20, 21) are at least one of a cylindrical bearing or a ball bearing; the rollers are housed in an axially free space (5") of the control ring (5) whereby said free space (5") is closed by a holding ring (22) which has axial extensions (24) of the rollers (3); the releasably connectable ring is the nozzle ring (6a); the diameters of the control ring (5) and of the releasably connectable ring (6, 38) which cooperate with the rollers (3, 20, 21) are calculated to provide a radial play (P) of the rollers at all operating temperatures; the modular unit (26, 26a) is held in a non-rotatable state through inter-engaging projections and depressions (33), and is solicited into this position by a soliciting device (32); between the rollers (3, 20, 21) and a space (9, 23) which carries fluid, a ring shaped sealing (27, 28) is provided; the rollers are formed in a free space (5") by a number of cylinders or balls which fill said free space (5"); or the rollers are formed by at least three cylinders or balls that are guided in the free space (5") by a freely rotatable holding ring (22). 10. The turbine unit according to claim 1, wherein the modular unit (26, 26a), the control ring (5), the roller bearing (3, 20, 21) and the releasably connectable ring (6) are held together in non-rotatable fashion through inter-engaging projections and depressions (33), and wherein the modular unit is solicited into this position by means of a soliciting device. 11. The turbine unit according to claim 1, wherein one of the bearing ring (38) or the fastening ring (29) are assembled as the modular unit.