A variable geometry turbine comprises a turbine wheel supported in a housing for rotation about a turbine axis. The housing defines an annular inlet passage around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine
A variable geometry turbine comprises a turbine wheel supported in a housing for rotation about a turbine axis. The housing defines an annular inlet passage around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel; the inlet passage is defined between first and second radial inlet surfaces, one of the inlet surfaces being defined by a moveable wall member and the other of the inlet surfaces being defined by a facing wall of said housing. The moveable wall member is moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway. The moveable wall member is displaceably mounted within an annular cavity defined between the tubular wall and a surrounding wall of the housing.
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1. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion
1. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein the housing comprises an inlet portion defining said inlet passage and at least a portion of said surrounding wall and an outlet portion joined to said inlet portion and defining at least a portion of said outlet passage;wherein the tubular wall is integrally formed with said outlet portion of the housing; andwherein a generally radially extending annular wall portion integral with said tubular wall and said outlet portion of the housing extends between the two and closes an axial end of the cavity remote from said inlet passage. 2. A variable geometry turbine according to claim 1, wherein said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wail member to said surrounding wall, and wherein said radial projection is secured between an inlet portion and an outlet portion of the housing. 3. A variable geometry turbine according to claim 1, wherein said surrounding wall extends axially beyond said tubular wall to define a generally tubular portion of the outlet passage downstream of said tubular wall relative to flow through the turbine. 4. A variable geometry turbine according to claim 1, wherein said outlet portion of the housing defines at least a portion of said surrounding wall. 5. A variable geometry turbine according to claim 1, wherein the tubular wall is supported by said outlet portion of the housing. 6. A variable geometry turbine according to claim 1, wherein said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wall member to said surrounding wall. 7. A variable geometry turbine according to claim 6, wherein said radial projection is secured between said inlet and outlet portions of the housing. 8. A variable geometry turbine according to claim 6, wherein said radial projection is a radially extending annular flange. 9. A variable geometry turbine according to claim 8, wherein said annular flange is integral with said tubular wall member. 10. A variable geometry turbine according to claim 1, wherein the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in said annular wall portion or radial projection for connection to an actuating mechanism. 11. A variable geometry turbine according to claim 10, comprising at least two of said axially moveable rods, and further comprising an actuating mechanism including a beam linked to each of the rods and means for displacing the beam in a direction along the axis of the turbine to thereby axially displace the moveable wall member. 12. A variable geometry turbine according to claim, 11 wherein the beam is disposed within the outlet passage downstream of said tubular wall and is connected to an actuator disposed outside of the outlet passage by a linkage which extends through a wall of the outlet passage, the actuator and linkage together comprising said means for displacing the beam. 13. A variable geometry turbine according to claim 12, wherein the outlet passage comprises a first generally tubular portion extending axially away from said tubular wall, and a second portion extending at an oblique angle to said first portion and defined at least in part by said wall of the outlet passage through which said linkage extends through. 14. A variable geometry turbine according to claim 13, wherein said linkage is a drive rod. 15. A variable geometry turbine according to claim 1, wherein the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in a radially extending support wall which extends between the tubular wall and the surrounding wall between the inlet passage and said annular wall portion or radial projection. 16. A variable geometry turbine according to claim 15, wherein said support wall is an annular flange. 17. A variable geometry turbine according to claim 15, further comprising an actuating mechanism which engages the or each rod on the opposite side of the support wall to said moveable wall member. 18. A variable geometry turbine according to claim 17, wherein the actuating mechanism comprises a yoke pivotally supported relative to the housing and defining at least one arm which extends into engagement with the or each rod. 19. A variable geometry turbine according to claim 18, wherein the arm or arms of the yoke extend through said surrounding wall of the housing. 20. A variable geometry turbine according to claim 1, wherein inlet vanes are fixed to said first inlet surface and vane slots are provided in said second inlet surface to receive said inlet vanes as the inlet surfaces move axially towards one another. 21. A variable geometry turbine according to claim 1, wherein the exducer portion of the turbine wheel defines a tubular profile as it rotates about said axis and which varies in radius along the axis, and the radially inner surface of the tubular wall has a matching tubular profile. 22. A variable geometry turbine according to claim 1, wherein said turbine housing is connected to a bearing housing defining a bearing cavity, the turbine wheel being mounted on a turbine shaft which extends through a housing wall separating the turbine wheel and bearing cavity. 23. A variable geometry turbocharger, comprising: a variable geometry turbine including: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein the housing comprises an inlet portion defining said inlet passage and at least a portion of said surrounding wall and an outlet portion joined to said inlet portion and defining at least a portion of said outlet passage;wherein the tubular wall is integrally formed with said outlet portion of the housing; andwherein a generally radially extending annular wall portion integral with said tubular wall and said outlet portion of the housing extends between the two and closes an axial end of the cavity remote from said inlet passage. 24. A variable geometry turbine according to claim 1, wherein: said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection, and/or an annular wall portion, extending from said tubular wall member to said surrounding wall; the moveable wall member is mounted on an end of at least two axially moveable rods, each rod extending through an aperture in said radial projection, and/or said annular wall portion, for connection to an actuating mechanism located on the opposite side of the radial projection and/or an annular wall portion to said moveable wall member; the actuating mechanism including a beam linked to each of the rods and a yoke for displacing the beam in a direction along the axis of the turbine to thereby axially displace the moveable wall member, the yoke being pivotally supported relative to the housing and defining at least one arm which extends into engagement with each rod. 25. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wall member to said surrounding wall;the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in said radial projection for connection to an actuating mechanism. 26. A variable geometry turbine according to claim 25 comprising at least two of said axially moveable rods, and further comprising an actuating mechanism including a beam linked to each of the rods and means for displacing the beam in a direction along the axis of the turbine to thereby axially displace the moveable wall member. 27. A variable geometry turbine according to claim 26 wherein the beam is disposed within the outlet passage downstream of said tubular wall and is connected to an actuator disposed outside of the outlet passage by a linkage which extends through a wall of the outlet passage, the actuator and linkage together comprising said means for displacing the beam. 28. A variable geometry turbine according to claim 27 wherein the outlet passage comprises a first generally tubular portion extending axially away from said tubular wall, and a second portion extending at an oblique angle to said first portion and defined at least in part by said wall of the outlet passage through which said linkage extends through. 29. A variable geometry turbine according to claim 28 wherein said linkage is a drive rod. 30. A variable geometry turbocharger, comprising: a variable geometry turbine comprising:a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wall member to said surrounding wall;the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in said radial projection for connection to an actuating mechanism. 31. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wall member to said surrounding wall;wherein the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in a radially extending support wall which extends between the tubular wall and the surrounding wall between the inlet passage and said radial projection. 32. A variable geometry turbine according to claim 31 wherein said support wall is an annular flange. 33. A variable geometry turbine according to claim 31, further comprising an actuating mechanism which engages the or each rod on the opposite side of the support wall to said moveable wall member. 34. A variable geometry turbine according to claim 33, wherein the actuating mechanism comprises a yoke pivotally supported relative to the housing and defining at least one arm which extends into engagement with the or each rod. 35. A variable geometry turbine according to claim 34, wherein the arm or arms of the yoke extend through said surrounding wall of the housing. 36. A variable geometry turbocharger, comprising: a variable geometry turbine comprising:a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;said tubular wall is defined by a tubular wall member supported within said surrounding wall by at least one radial projection extending from said tubular wall member to said surrounding wall;wherein the moveable wall member is mounted on an end of at least one axially moveable rod, the or each rod extending through an aperture in a radially extending support wall which extends between the tubular wall and the surrounding wall between the inlet passage and said radial projection. 37. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein inlet vanes are fixed to said first inlet surface and vane slots are provided in said second inlet surface to receive said inlet vanes as the inlet surfaces move axially towards one another. 38. A variable geometry turbocharger, comprising: a variable geometry turbine comprising:a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein inlet vanes are fixed to said first inlet surface and vane slots are provided in said second inlet surface to receive said inlet vanes as the inlet surfaces move axially towards one another. 39. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein the exducer portion of the turbine wheel defines a tubular profile as it rotates about said axis and which varies in radius along the axis, and the radially inner surface of the tubular wall has a matching tubular profile. 40. A variable geometry turbocharger, comprising: a variable geometry turbine comprising:a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein the exducer portion of the turbine wheel defines a tubular profile as it rotates about said axis and which varies in radius along the axis, and the radially inner surface of the tubular wall has a matching tubular profile. 41. A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein said turbine housing is connected to a bearing housing defining a bearing cavity, the turbine wheel being mounted on a turbine shaft which extends through a housing wall separating the turbine wheel and bearing cavity. 42. A variable geometry turbocharger, comprising: a variable geometry turbine comprising:a turbine wheel supported in a housing for rotation about a turbine axis;the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel;the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway;the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing;wherein said turbine housing is connected to a bearing housing defining a bearing cavity, the turbine wheel being mounted on a turbine shaft which extends through a housing wall separating the turbine wheel and bearing cavity.
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이 특허에 인용된 특허 (9)
Engels, Berthold; Forster, Arno; Lingenauber, Robert; Jaisle, Jens-Wolf, Controllable exhaust gas turbocharger with a double-fluted turbine housing.
Szczupak David T. (Huddersfield GB2) Walsham Brian E. (Holmfirth GB2) Hooley Desmond J. (Marsden GB2) Flaxington David (Bradford GB2) McKean Peter S. (Huddersfield GB2) Wescott John D. (Skelmanthorpe, Turbocharger having a variable inlet area turbine.
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