A variable geometry turbine comprising: a housing; a turbine wheel supported in the housing for rotation; an annular inlet passage defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud; the nozzle ring can vary the size of the inlet passage; a circum
A variable geometry turbine comprising: a housing; a turbine wheel supported in the housing for rotation; an annular inlet passage defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud; the nozzle ring can vary the size of the inlet passage; a circumferential array of inlet vanes; the shroud covering the opening of a shroud cavity defined by the housing inlet passage and inboard of the shroud, and defining a circumferential array of slots, the slots and shroud cavity being configured to receive said vanes accommodating movement of the nozzle ring; wherein the annular shroud comprises an outer flange, the outer flange defining a circumferential groove for receiving a retaining ring for securing the shroud in the opening of the shroud cavity and defined on an inboard side by a flange wall; wherein an annular flange rim extends axially inboard from said flange wall.
대표청구항▼
1. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular
1. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the inlet passage;the shroud covering the opening of a shroud cavity defined by the housing inlet passage and inboard of the shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises an outer flange around its radially outer periphery, the outer flange defining a circumferential flange groove for receiving a retaining ring for securing the shroud in the opening of the shroud cavity, the circumferential flange groove being defined on an inboard side by a radially extending flange wall;wherein an annular flange rim extends axially inboard from said radially extending flange wall. 2. A variable geometry turbine according to claim 1, wherein the annular flange rim is a continuation of an axially extending annular flange wall which defines an annular base of the circumferential flange groove and extending axially beyond said radially extending flange wall. 3. A variable geometry turbine according to claim 2, wherein an annular gap is defined between the annular flange rim and inner surface of the housing defining a portion of the shroud cavity, wherein said annular gap increases in radial width along the length of the annular flange rim towards the inboard end of the annular flange rim. 4. A variable geometry turbine according to claim 3, wherein the annular flange rim has a radially outer surface and a radially inner surface, and wherein the radius of the radial outer surface reduces towards the inboard end of the annular flange rim. 5. A variable geometry turbine according to claim 4, wherein the radius of the inner surface of the annular flange rim is substantially constant, so that the annular flange rim tapers along its length towards its inboard end. 6. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the annular inlet passage;the annular shroud covering an opening of a shroud cavity defined by the annular inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises an outer flange around its radially outer periphery, the outer flange defining a circumferential flange groove for receiving a retaining ring for securing the annular shroud in the opening of the shroud cavity, the circumferential flange groove being defined on an inboard side by a radially extending flange wall;wherein the retaining ring is a substantially annular split ring having a radially inner portion received within the circumferential flange groove and the radially outer portion received within an annular groove defined by the housing to thereby key the annular shroud in position in the mouth of the shroud cavity;the annular groove defined by the housing having an outboard sidewall, a base and an inboard side wall;wherein the outboard face of the radially outer portion of the retaining ring and the outboard sidewall of the annular groove defined by the housing define corresponding frusto-conical surfaces which cooperate to bias the retaining ring in an inboard direction under a radial spring force of the retaining ring, thereby urging a portion of the shroud into contact with an abutment surface defined by the housing to secure the annular shroud in position in the mouth of the shroud cavity;wherein the axial width of the annular groove defined by the housing is such that the inboard wall of the annular groove defined by the housing is spaced from the inboard surface of the radially outer portion of the retaining ring so that there is no contact between the two; andwherein the axial spacing between the inboard wall of the radially outer portion of the retaining ring and the inboard wall of the annular groove defined by the housing is at least equal to the maximum width of the retaining ring. 7. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the annular inlet passage;the annular shroud covering an opening of a shroud cavity defined by the annular inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises an outer flange around its radially outer periphery, the outer flange defining a circumferential flange groove for receiving a retaining ring for securing the annular shroud in the opening of the shroud cavity, the circumferential flange groove being defined on an inboard side by a radially extending flange wall;wherein the retaining ring is a substantially annular split ring having a radially inner portion received within the circumferential flange groove and the radially outer portion received within an annular groove defined by the housing to thereby key the annular shroud in position in the mouth of the shroud cavity;the annular groove defined by the housing having an outboard sidewall, a base and an inboard side wall;wherein the outboard face of the radially outer portion of the retaining ring and the outboard sidewall of the annular groove defined by the housing define corresponding frusto-conical surfaces which cooperate to bias the retaining ring in an inboard direction under a radial spring force of the retaining ring, thereby urging a portion of the shroud into contact with an abutment surface defined by the housing to secure the annular shroud in position in the mouth of the shroud cavity;wherein the axial width of the annular groove defined by the housing is such that the inboard wall of the annular groove defined by the housing is spaced from the inboard surface of the radially outer portion of the retaining ring so that there is no contact between the two; andwherein the inboard wall of the annular groove defined by the housing extends to a smaller radius than the outer radius of the annular shroud, and wherein an axial gap is defined between said inboard wall of the annular groove defined by the housing and the outer flange of the annular shroud. 8. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the annular inlet passage;the annular shroud covering an opening of a shroud cavity defined by the annular inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises an outer flange around its radially outer periphery, the outer flange defining a circumferential flange groove for receiving a retaining ring for securing the annular shroud in the opening of the shroud cavity, the circumferential flange groove being defined on an inboard side by a radially extending flange wall;wherein the retaining ring is a substantially annular split ring having a radially inner portion received within the circumferential flange groove and the radially outer portion received within an annular groove defined by the housing to thereby key the annular shroud in position in the mouth of the shroud cavity;the annular groove defined by the housing having an outboard sidewall, a base and an inboard side wall;wherein the outboard face of the radially outer portion of the retaining ring and the outboard sidewall of the annular groove defined by the housing define corresponding frusto-conical surfaces which cooperate to bias the retaining ring in an inboard direction under a radial spring force of the retaining ring, thereby urging a portion of the shroud into contact with an abutment surface defined by the housing to secure the annular shroud in position in the mouth of the shroud cavity;wherein the axial width of the annular groove defined by the housing is such that the inboard wall of the annular groove defined by the housing is spaced from the inboard surface of the radially outer portion of the retaining ring so that there is no contact between the two;wherein the portion of the annular shroud which is urged against an abutment surface of the housing is at the radially inner periphery of the annular shroud; andwherein said portion of the annular shroud which is urged into contact with an abutment surface of the housing, is an axially extending inboard flange at the radially inner periphery of the annular shroud. 9. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the annular inlet passage;the annular shroud covering an opening of a shroud cavity defined by the annular inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises an outer flange around its radially outer periphery, the outer flange defining a circumferential flange groove for receiving a retaining ring for securing the annular shroud in the opening of the shroud cavity, the circumferential flange groove being defined on an inboard side by a radially extending flange wall;wherein the retaining ring is a substantially annular split ring having a radially inner portion received within the circumferential flange groove and the radially outer portion received within an annular groove defined by the housing to thereby key the annular shroud in position in the mouth of the shroud cavity;the annular groove defined by the housing having an outboard sidewall, a base and an inboard side wall;wherein the outboard face of the radially outer portion of the retaining ring and the outboard sidewall of the annular groove defined by the housing define corresponding frusto-conical surfaces which cooperate to bias the retaining ring in an inboard direction under a radial spring force of the retaining ring, thereby urging a portion of the shroud into contact with an abutment surface defined by the housing to secure the annular shroud in position in the mouth of the shroud cavity; andwherein the axial width of the annular groove defined by the housing is such that the inboard wall of the annular groove defined by the housing is spaced from the inboard surface of the radially outer portion of the retaining ring so that there is no contact between the two; andwherein the portion of the annular shroud urged into contact with an abutment surface of the housing is a portion of the radially outer flange. 10. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the inlet passage;the annular shroud covering an opening of a shroud cavity defined by the housing inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises a radially extending outer flange wall around its radially outer periphery;wherein the housing defines an internally screw threaded annular surface around the opening of the shroud cavity;wherein the annular shroud is retained in position by a retaining ring provided with a screw threaded outer surface which engages said screw threaded surface of the housing and wherein a portion of the retaining ring bears against the radially extending outer flange wall of the annular shroud; andwherein the retaining ring has a radially extending outboard portion and an axially extending inboard portion, wherein said inboard portion defines said screw threaded surface for engagement with the screw threaded surface of the housing, and wherein the radially extending outboard portion bears against the radially extending outer flange wall of the annular shroud. 11. A variable geometry turbine according to claim 10, wherein the radially extending outer flange wall of the annular shroud is trapped between the radially extending portion of the retaining ring and an annular support ring located within the opening of the shroud cavity. 12. A variable geometry turbine according to claim 10, wherein the annular shroud has an inner annular flange extending radially inboard at its inner periphery, and wherein the inboard end of the inner flange is urged against an abutment surface of the housing by axial force applied to the annular shroud by the retaining ring. 13. A variable geometry turbine according to claim 10, wherein the radially extending outer flange wall of the annular shroud extends radially from the inboard end of an axially extending shroud flange wall. 14. A variable geometry turbine according to claim 13, where a radial outboard surface of the retaining ring is substantially aligned with the radial outboard surface of the annular shroud. 15. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the inlet passage;the annular shroud covering an opening of a shroud cavity defined by the housing inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises a radially extending outer flange wall around its radially outer periphery;wherein the housing defines an internally screw threaded annular surface around the opening of the shroud cavity;wherein the annular shroud is retained in position by a retaining ring provided with a screw threaded outer surface which engages said screw threaded surface of the housing and wherein a portion of the retaining ring bears against the radially extending outer flange wall of the annular shroud;wherein the retaining ring has a radially extending outboard portion and an axially extending inboard portion, wherein said inboard portion defines said screw threaded surface for engagement with the screw threaded surface of the housing, and wherein the radially extending outboard portion bears against the radially extending outer flange wall of the annular shroud; andwherein the radially extending outer flange wall of the annular shroud is trapped between the radially extending portion of the retaining ring and an annular support ring located within the opening of the shroud cavity. 16. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the inlet passage;the annular shroud covering an opening of a shroud cavity defined by the housing inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises a radially extending outer flange wall around its radially outer periphery;wherein the housing defines an internally screw threaded annular surface around the opening of the shroud cavity;wherein the annular shroud is retained in position by a retaining ring provided with a screw threaded outer surface which engages said screw threaded surface of the housing and wherein a portion of the retaining ring bears against the radially extending outer flange wall of the annular shroud;wherein the retaining ring has a radially extending outboard portion and an axially extending inboard portion, wherein said inboard portion defines said screw threaded surface for engagement with the screw threaded surface of the housing, and wherein the radially extending outboard portion bears against the radially extending outer flange wall of the annular shroud; andwherein the annular shroud has an inner annular flange extending radially inboard at its inner periphery, and wherein the inboard end of the inner flange is urged against an abutment surface of the housing by axial force applied to the annular shroud by the retaining ring. 17. A variable geometry turbine comprising: a housing;a turbine wheel supported in the housing for rotation about a turbine axis;an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud;the annular nozzle ring being axial movable to vary the size of the inlet passage;a circumferential array of inlet vanes supported by the annular nozzle ring and extending across the inlet passage;the annular shroud covering an opening of a shroud cavity defined by the housing inlet passage and inboard of the annular shroud, and defining a circumferential array of vane slots, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the annular nozzle ring;wherein the annular shroud comprises a radially extending outer flange wall around its radially outer periphery;wherein the housing defines an internally screw threaded annular surface around the opening of the shroud cavity;wherein the annular shroud is retained in position by a retaining ring provided with a screw threaded outer surface which engages said screw threaded surface of the housing and wherein a portion of the retaining ring bears against the radially extending outer flange wall of the annular shroud;wherein the retaining ring has a radially extending outboard portion and an axially extending inboard portion, wherein said inboard portion defines said screw threaded surface for engagement with the screw threaded surface of the housing, and wherein the radially extending outboard portion bears against the radially extending outer flange wall of the annular shroud; andwherein the radially extending outer flange wall of the annular shroud extends radially from the inboard end of an axially extending shroud flange wall. 18. A variable geometry turbine according to claim 17, wherein a radial outboard surface of the retaining ring is substantially aligned with the radial outboard surface of the annular shroud.
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