IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0611809
(2009-11-03)
|
등록번호 |
US-8424304
(2013-04-23)
|
발명자
/ 주소 |
- Serres, Nicolas
- Ladonnet, Michael
|
출원인 / 주소 |
- Honeywell International Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
8 |
초록
▼
A turbine assembly for an exhaust gas turbocharger has separate first and second volutes that are sequentially activated via a valve that receives exhaust gases from an engine. In a first position of the valve, only the first volute receives exhaust gas; in a second position, both volutes receive ex
A turbine assembly for an exhaust gas turbocharger has separate first and second volutes that are sequentially activated via a valve that receives exhaust gases from an engine. In a first position of the valve, only the first volute receives exhaust gas; in a second position, both volutes receive exhaust gases. In a third position, a bypass passage is also opened so that some exhaust gas bypasses the turbine wheel. Unlike conventional twin-scroll turbines, each volute receives exhaust gases from all engine cylinders, and the first volute feeds gas into the B-width portion of the wheel, while the second volute feeds gas into the wheel after the contour portion.
대표청구항
▼
1. A turbine assembly of a turbocharger for use with an internal combustion engine, the turbine assembly comprising: a turbine housing configured for receiving engine exhaust gas, the turbine housing defining a bore for conducting a flow of exhaust gas out of the turbine housing in an axial directio
1. A turbine assembly of a turbocharger for use with an internal combustion engine, the turbine assembly comprising: a turbine housing configured for receiving engine exhaust gas, the turbine housing defining a bore for conducting a flow of exhaust gas out of the turbine housing in an axial direction, and a twin volute surrounding the bore, the twin volute comprising a first volute and a second volute that is divided and separated from the first volute;a turbine wheel rotatably mounted in the bore, the turbine wheel having turbine blades and defining a B-width portion having an axial length, wherein the B-width portion is the largest-diameter portion of the wheel formed by leading edges of the turbine blades and is linear over the axial length of the B-width portion as viewed in a radial-axial projection of the wheel, the B-width portion being followed in the axial direction by a contour portion that is concave in a radially outward direction as viewed in radial-axial projection, the contour portion being followed in the axial direction by a final portion, the turbine wheel further defining a throat located in the final portion;the first volute having an outlet aligned with the B-width portion of the turbine wheel so as to direct exhaust gas to enter into the B-width portion of the turbine wheel;the second volute having an outlet aligned with the final portion of the turbine wheel so as to direct exhaust gas to enter into the final portion of the turbine wheel at a location upstream of the throat;wherein, of the first and second volutes, only the first volute feeds exhaust gas into the B-width portion of the turbine wheel; anda valve arranged to receive engine exhaust gas and regulate flow of the exhaust gas into the first and second volutes. 2. The turbine assembly of claim 1, wherein the second volute has a greater A/R ratio than does the first volute. 3. The turbine assembly of claim 1, wherein the turbine housing has a single exhaust gas inlet for receiving exhaust gas from the engine, and the valve is arranged in the turbine housing downstream of the exhaust gas inlet so as to receive exhaust gas therefrom, the valve defining a valve cavity connected to the second volute but not to the first volute, the valve further comprising a valve member movable between a first position allowing exhaust gas to flow to the first volute but preventing exhaust gas from flowing from the valve cavity to the second volute, and a second position allowing exhaust gas to flow to the first volute and to flow from the valve cavity to the second volute. 4. The turbine assembly of claim 3, wherein the outlet of the first volute has an axial width equal to the axial length of the B-width portion. 5. The turbine assembly of claim 4, wherein the outlet of the second volute is spaced axially downstream of the B-width portion. 6. The turbine assembly of claim 3, wherein the valve further comprises a bypass passage connected from the valve cavity to the bore downstream of the turbine wheel, and wherein the valve member is movable into a third position allowing exhaust gas to flow to the first and second volutes and through the bypass passage to the bore. 7. The turbine assembly of claim 6, wherein the valve cavity has a proximal end adjacent the bypass passage and an opposite distal end, and a valve seat is defined by the turbine housing at the distal end of the valve cavity, the valve member having a distal end portion engaging the valve seat in the first position. 8. The turbine assembly of claim 7, wherein the valve member has a proximal portion configured such that in the partially open position of the valve member the proximal portion occupies and closes off the bypass passage. 9. The turbine assembly of claim 8, wherein the valve is configured and arranged such that in the third position the valve member is completely withdrawn from the valve cavity and the bypass passage. 10. The turbine assembly of claim 9, wherein the valve member is a swing-type waste gate, wherein the proximal portion of the valve member is tubular and is affixed to one end of an arm, an opposite end of the arm being pivotally connected to the turbine housing such that the valve member is rotatable about a pivot axis, wherein the proximal portion of the valve member is sized so as to fill and close off the bypass passage when inserted through the bypass passage into the valve cavity, the distal portion of the valve member being attached to one end of the proximal portion, the distal portion being configured to seat against the valve seat in a substantially sealed manner when the valve member is inserted fully into the valve cavity. 11. The turbine assembly of claim 10, wherein when the valve member is rotated about the pivot axis from the position seated against the valve seat, the distal portion unseats from the valve seat and thus exhaust gas can flow into the valve cavity and into the second volute, while the engagement of the proximal portion of the valve member in the bypass passage prevents exhaust gas from flowing through the bypass passage. 12. The turbine assembly of claim 11, wherein when the valve member is further rotated about the pivot axis from the position having the proximal portion engaged in the bypass passage, the valve member becomes entirely withdrawn from the valve cavity and bypass passage, and therefore exhaust gas can flow from the valve cavity to the second volute as well as through the bypass passage into the bore. 13. A turbine assembly of a turbocharger for use with an internal combustion engine, the turbine assembly comprising: a turbine housing configured for receiving commingled engine exhaust gases from all cylinders of the engine through a single exhaust gas inlet of the turbine housing, the turbine housing defining a bore for conducting a flow of exhaust gas out of the turbine housing in an axial direction, and a twin volute surrounding the bore, the twin volute comprising a first volute and a second volute that is divided and separated from the first volute;a turbine wheel rotatably mounted in the bore;a valve disposed downstream of the single exhaust gas inlet and arranged to receive engine exhaust gas from the exhaust gas inlet and regulate flow of the exhaust gas into the first and second volutes, the valve comprising: a valve cavity defined in the turbine housing, the valve cavity being connected to the second volute but not to the first volute;a bypass passage connected from the valve cavity to the bore downstream of the turbine wheel;the valve cavity having a proximal end adjacent the bypass passage and an opposite distal end, and a valve seat defined by the turbine housing at the distal end of the valve cavity;a valve member comprising a swing-type waste gate having a proximal portion and a distal portion, wherein the proximal portion is tubular and is affixed to one end of an arm, an opposite end of the arm being pivotally connected to the turbine housing such that the valve member is rotatable about a pivot axis, wherein the proximal portion of the valve member is sized so as to fill and close off the bypass passage when inserted through the bypass passage into the valve cavity, the distal portion of the valve member being attached to one end of the proximal portion, the distal portion being configured to seat against the valve seat in a substantially sealed manner when the valve member is inserted fully into the valve cavity so as to prevent exhaust gas from entering the valve cavity,wherein when the valve member is rotated about the pivot axis from the position seated against the valve seat, the distal portion unseats from the valve seat and thus exhaust gas can flow into the valve cavity and into the second volute, while the engagement of the proximal portion of the valve member in the bypass passage prevents exhaust gas from flowing through the bypass passage,and wherein when the valve member is further rotated about the pivot axis from the position having the proximal portion engaged in the bypass passage, the valve member becomes entirely withdrawn from the valve cavity and bypass passage, and therefore exhaust gas can flow from the valve cavity to the second volute as well as through the bypass passage into the bore.
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