A variable-nozzle turbocharger includes a turbine housing and a center housing, and a generally annular nozzle ring and an array of vanes rotatably mounted to the nozzle ring such that the vanes are rotatably adjustable for regulating exhaust gas flow to the turbine wheel. An elastically deformable
A variable-nozzle turbocharger includes a turbine housing and a center housing, and a generally annular nozzle ring and an array of vanes rotatably mounted to the nozzle ring such that the vanes are rotatably adjustable for regulating exhaust gas flow to the turbine wheel. An elastically deformable member is disposed between a radially inwardly facing surface of the nozzle ring and a radially outwardly facing surface of the center housing, the elastically deformable member having a radially inner surface contacting the radially outwardly facing surface of the center housing and having a radially outer surface contacting the radially inwardly facing surface of the nozzle ring so as to radially center the nozzle ring relative to the center housing.
대표청구항▼
1. A turbocharger having a variable-nozzle turbine, comprising: a turbine assembly comprising a turbine housing and a turbine wheel mounted in the turbine housing and connected to a rotatable shaft for rotation therewith, and defining a nozzle through which exhaust gas flows to the turbine wheel;a c
1. A turbocharger having a variable-nozzle turbine, comprising: a turbine assembly comprising a turbine housing and a turbine wheel mounted in the turbine housing and connected to a rotatable shaft for rotation therewith, and defining a nozzle through which exhaust gas flows to the turbine wheel;a compressor assembly comprising a compressor housing and a compressor wheel mounted in the compressor housing and connected to the rotatable shaft for rotation therewith;a center housing connected between the compressor housing and the turbine housing; anda generally annular nozzle ring and an array of vanes circumferentially spaced about and supported by the nozzle ring and disposed in the nozzle such that exhaust gas flows between the vanes to the turbine wheel;wherein a radially inwardly facing surface of the nozzle ring directly contacts a radially outwardly facing surface of the center housing to radially locate the nozzle ring relative to the center housing, and wherein one of the radially inwardly facing surface of the nozzle ring and the radially outwardly facing surface of the center housing is configured to reduce a contact area with the other of the radially inwardly facing surface of the nozzle ring and the radially outwardly facing surface of the center housing. 2. The turbocharger of claim 1, wherein the radially inwardly facing surface of the nozzle ring defines a plurality of circumferentially spaced recesses, regions between the recesses defining the radially inwardly facing surface that contacts the radially outwardly facing surface of the center housing and provides radial centering of the nozzle ring relative to the center housing. 3. The turbocharger of claim 1, wherein the radially outwardly facing surface of the center housing defines a plurality of circumferentially spaced projections that project radially outward to contact the radially inwardly facing surface of the nozzle ring and provide radial centering of the nozzle ring relative to the center housing. 4. The turbocharger of claim 1, further comprising an elastically deformable heat shroud disposed between the nozzle ring and the center housing, an axially facing surface of the nozzle ring contacting an outer portion of the heat shroud proximate an outer diameter thereof and urging the heat shroud toward the center housing such that an inner portion of the heat shroud proximate an inner diameter thereof is urged against a surface of the center housing, the heat shroud being elastically deformed between the nozzle ring and center housing. 5. A turbocharger having a variable-nozzle turbine, comprising: a turbine assembly comprising a turbine housing and a turbine wheel mounted in the turbine housing and connected to a rotatable shaft for rotation therewith, and defining a nozzle through which exhaust gas flows to the turbine wheel;a compressor assembly comprising a compressor housing and a compressor wheel mounted in the compressor housing and connected to the rotatable shaft for rotation therewith;a center housing connected between the compressor housing and the turbine housing;a generally annular nozzle ring and an array of vanes circumferentially spaced about and supported by the nozzle ring and disposed in the nozzle such that exhaust gas flows between the vanes to the turbine wheel; anda ring-shaped sleeve disposed between a radially inwardly facing surface of the nozzle ring and a radially outwardly facing surface of the center housing, the sleeve having a radially inner surface contacting the radially outwardly facing surface of the center housing and having a radially outer surface contacting the radially inwardly facing surface of the nozzle ring so as to center the nozzle ring relative to the center housing. 6. The turbocharger of claim 5, wherein the sleeve defines a plurality of circumferentially spaced projections that project radially outwardly and define the radially outer surface that contacts the nozzle ring, the projections reducing a contact area with the nozzle ring. 7. The turbocharger of claim 6, wherein the sleeve at one circumferential location thereof defines a radially outwardly extending protuberance that extends out to a larger radius than the plurality of circumferentially spaced projections, the nozzle ring at one circumferential location thereof defining a recess for receiving the protuberance such that the nozzle ring is oriented in a predetermined circumferential orientation with respect to the sleeve. 8. The turbocharger of claim 7, wherein the sleeve and center housing define cooperative features that engage each other for orienting the sleeve in a predetermined circumferential orientation relative to the center housing. 9. The turbocharger of claim 5, the sleeve comprising a split compensating ring. 10. The turbocharger of claim 9, wherein the compensating ring is radially undulating along the circumferential direction for reducing contact area with the nozzle ring and center housing. 11. The turbocharger of claim 5, the sleeve comprising an elastically deformable spring sleeve. 12. The turbocharger of claim 11, wherein the spring sleeve has a generally S-shaped cross-section. 13. The turbocharger of claim 11, wherein the nozzle ring defines an axially facing surface that faces the center housing, and the center housing defines an axially facing surface that faces the turbine wheel, and further comprising a heat shroud having a radially outer portion disposed between and contacting the spring sleeve and the axially facing surface of the nozzle ring. 14. The turbocharger of claim 13, wherein the spring sleeve is elastically deformed between the heat shroud and the axially facing surface of the center housing. 15. The turbocharger of claim 14, wherein the heat shroud is free from contact with the center housing. 16. The turbocharger of claim 5, the sleeve comprising a heat shroud providing shielding of the center housing from exhaust gas passing through the turbine. 17. The turbocharger of claim 16, wherein the nozzle ring defines an axially facing surface that faces the center housing, and the center housing defines an axially facing surface that faces the turbine wheel, and wherein the heat shroud engages the axially facing surfaces of the nozzle ring and center housing.
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이 특허에 인용된 특허 (13)
Meier Marcel,CHX ; Seiler Martin,CHX ; Weisheit Claus,DEX ; Zehnder Marcel,CHX, Exhaust-gas turbine of a turbocharger.
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