A variable geometry turbine comprise a housing; a turbine wheel supported in the housing for rotation about a turbine axis; and 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 nozzle
A variable geometry turbine comprise a housing; a turbine wheel supported in the housing for rotation about a turbine axis; and 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 nozzle ring and shroud are axially movable relative to one another to vary the size of the inlet passage; the nozzle ring having a circumferential array of inlet vanes extending across the inlet passage. The shroud covers the opening of a shroud cavity and defines a circumferential array of vane slots, each vane slot corresponding to an inlet vane, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the nozzle ring. At least one vane slot has a first side corresponding to a first side of the corresponding inlet vane and a second side corresponding to a second side of the corresponding inlet vane, the first side of the vane slot being located a shorter radial distance from the turbine wheel than the second side of the vane slot. The at least one vane slot has a leading end corresponding to a leading end of a corresponding inlet vane, and a trailing end downstream of the leading end, the trailing end corresponding to a trailing end of the inlet vane. A vane chord extends in a straight line between the a leading end tip and a trailing end tip of the inlet vane. The at least one vane slot has an increased clearance portion, the clearance between a portion of the at least one vane slot, which forms part of the increased clearance portion, and an adjacent portion of the inlet vane being greater than the clearance between a further portion of the at least one vane slot, which does not form part of the increased clearance portion, and an adjacent portion of the inlet vane. The increased clearance portion is located at the second side of the vane slot and extending from a trailing end tip of the trailing end of the vane slot to a point which is a distance from the trailing end of the vane slot, in the direction of the vane chord, that is greater than about 10% of the length of the vane chord.
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 nozzle r
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 nozzle ring and shroud axially movable relative to one another to vary a size of the inlet passage;the nozzle ring having a circumferential array of inlet vanes extending across the inlet passage;the shroud covering an opening of a shroud cavity and defining a circumferential array of vane slots, each vane slot corresponding to an inlet vane, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the nozzle ring;wherein at least one vane slot has a first side corresponding to a first side of the corresponding inlet vane and a second side corresponding to a second side of the corresponding inlet vane, the first side of the vane slot being located a shorter radial distance from the turbine wheel than the second side of the vane slot;wherein the at least one vane slot has a leading end corresponding to a leading end of a corresponding inlet vane, and a trailing, end downstream of the leading end, the trailing end corresponding to a end of the inlet vane;wherein a vane chord extends in a straight line between a leading end tip and a trailing end tip of the inlet vane;wherein the at least one vane slot, has an increased clearance portion, a clearance between a portion of the at least one vane slot, which forms part of the increased clearance portion, and an adjacent portion of the inlet vane being greater than a clearance between a further portion of the at least one vane slot, which does not form part of the increased clearance portion, and an adjacent portion of the inlet vane;the increased clearance portion being located at the second side of the vane slot and extending from a trailing end tip of the trailing end of the vane slot to a point which is a distance from the trailing end of the vane slot, in the direction of the vane chord, that is greater than about 10% of the length of the vane chord. 2. The variable geometry turbine according to claim 1, wherein a maximum clearance between the increased clearance portion of the vane slot occurs between a maximum clearance portion of the vane slot and the inlet vane, the maximum clearance being greater than a thickness of a portion of the inlet vane which is aligned with the maximum clearance portion in a direction which is perpendicular to the vane chord; the thickness of the vane being measured perpendicular to the vane chord. 3. The variable geometry turbine according to claim 1, wherein the shroud comprises a shroud plate defining a generally radial surface, the circumferential array of vane slots passing through the generally radial surface. 4. The variable geometry turbine according to any claim 1, wherein the increased clearance portion of the at least one vane slot comprises a main region and a tapered region, the main region extending from the trailing end tip of the trailing end of the vane towards leading end of the vane slot, the tapered region adjoining the main region. 5. The variable geometry turbine according to claim 4, wherein a clearance between the vane and the edge of the vane slot within the main region of the increased clearance portion is greater than that of a clearance between the vane and edge of the vane slot in the tapered region of the increased clearance portion. 6. A turbocharger comprising a turbine according to claim 1. 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 nozzle ring and shroud being axially movable relative to one another to vary a size of the inlet passage;the nozzle ring having a circumferential array of inlet vanes extending across the inlet passage;the shroud covering an opening of a shroud cavity and defining a circumferential array of vane slots, each vane slot corresponding to an inlet vane, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the nozzle ring; wherein at least one vane slot has a first side corresponding to a first side of the corresponding inlet vane and a second side corresponding to a second side of the corresponding inlet vane, the first side of the vane slot being located a shorter radial distance from the turbine wheel than the second side of the vane slot;wherein the at least one vane slot has a leading end corresponding to a leading end of a corresponding inlet vane, and a trailing end downstream of the leading end, the trailing end corresponding to a trailing end of the inlet vane;wherein a vane chord extends in a straight line between the leading end and the trailing end of the inlet vane;wherein the at least one vane slot has an increased clearance portion, a clearance between a portion of the at least one vane slot, which forms part of the increased clearance portion, and an adjacent portion of the inlet vane being greater than a clearance between a further portion of the at least one vane slot, which does not form part of the increased clearance portion, and an adjacent portion of the inlet vane;the increased clearance portion being located at the second side of the vane slot and extending from a trailing end tip of the trailing end of the vane; andwherein a maximum clearance between the increased clearance portion of the vane slot and the inlet vane occurs between a maximum clearance portion of the vane slot and an adjacent portion of the inlet vane, the maximum clearance being greater than a thickness of the adjacent portion of the inlet vane, the adjacent portion of the inlet vane being aligned with the maximum clearance portion of the vane slot in a direction which is perpendicular to the vane chord; the thickness of the adjacent portion of the inlet vane being measured perpendicular to the vane chord. 8. The variable geometry turbine according to claim 7, wherein the maximum clearance between the increased clearance portion of the vane slot and the inlet vane is less than about 7 times the thickness of the adjacent portion of the inlet vane. 9. The variable geometry turbine according to claim 7, wherein the shroud comprises a shroud plate defining a generally radial surface, the circumferential array of vane slots passing through the generally radial surface. 10. The variable geometry turbine according to claim 7, wherein the increased clearance portion of the at least one vane slot comprises a main region and a tapered region, the main region extending from the trailing end tip of the trailing end of the vane towards leading end of the vane slot, the tapered region adjoining the main region. 11. The variable geometry turbine according to claim 10, wherein a clearance between the vane and the edge of the vane slot within the main region of the increased clearance portion is greater than that of a clearance between the vane and edge of the vane slot in the tapered region of the increased clearance portion. 12. A turbocharger comprising a turbine according to claim 7.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (4)
Bernardini, Luciano Labindo; Lombard, Alain Rene; Perrin, Jean-Luc Hubert; Viola, Eric Joseph, Turbocharger with sliding blades having combined dynamic surfaces and heat screen and uncoupled axial actuating device.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.