Mixed flow twin scroll turbocharger with single valve
First Claim
1. A turbocharger (100) comprising:
- a turbine housing (103) and a turbine wheel (108) rotatably disposed therein, said turbine housing (103) defining a first volute (101) and a second volute (102), the first volute (101) being smaller in size than the second volute (102), and which are separated from each other by a volute wall (107) in a twin scroll configuration, said first and second volutes (101) and (102) each discharging into said turbine housing (103) toward said turbine wheel (108), and a volute valve (104) being provided in said volute wall (107),wherein said first and second volutes (101) and (102) are supplied with exhaust gas through a turbine inlet (106) wherein substantially all of said exhaust gas received in said turbine inlet (106) is directed to said first and second volutes (101) and (102), said second volute (102) being selectively closed and opened by said volute valve (104),wherein all of said exhaust gas initially flows exclusively into said first volute (101) when said volute valve (104) is closed and subsequently a portion of said exhaust gas flows into said second volute (102) when said volute valve (104) is opened,said turbine housing (103) having an asymmetric shape defined by the smaller and larger sizes of said first and second volutes (101) and (102) respectively which are angled toward said turbine wheel (108), said turbine wheel (108) being formed as a mixed flow turbine wheel, andwherein said first and second volutes (101) and (102) are asymmetric in size and orientation relative to said mixed flow wheel (108) such that said larger second volute (102) accommodates greater exhaust gas flows in comparison to said first volute (101) and wherein said turbocharger (100) has no wastegate.
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Accused Products
Abstract
A turbocharger (100) has an asymmetric, twin scroll volute design, having a first volute (101) and a larger second volute (102). The larger second volute (102) eliminates the need for a wastegate and its associated actuator. The smaller first volute (101) is sized for rapid transients and rated torque, while the second volute (102) is sized such that the turbine inlet pressure is satisfactory for rated power. Furthermore, the turbocharger (100) preferably incorporates a mixed flow turbine wheel (108) rather than a radial wheel, which allows for a larger wheel size to be used while still maintaining inertia. The turbine housing (103) is improved wherein the first and second volutes (101) and (102) are asymmetric with respect to each other and preferably, are leaned toward the bearing housing to match the axial component of the mixed flow turbine wheel inducer (112).
22 Citations
15 Claims
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1. A turbocharger (100) comprising:
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a turbine housing (103) and a turbine wheel (108) rotatably disposed therein, said turbine housing (103) defining a first volute (101) and a second volute (102), the first volute (101) being smaller in size than the second volute (102), and which are separated from each other by a volute wall (107) in a twin scroll configuration, said first and second volutes (101) and (102) each discharging into said turbine housing (103) toward said turbine wheel (108), and a volute valve (104) being provided in said volute wall (107), wherein said first and second volutes (101) and (102) are supplied with exhaust gas through a turbine inlet (106) wherein substantially all of said exhaust gas received in said turbine inlet (106) is directed to said first and second volutes (101) and (102), said second volute (102) being selectively closed and opened by said volute valve (104), wherein all of said exhaust gas initially flows exclusively into said first volute (101) when said volute valve (104) is closed and subsequently a portion of said exhaust gas flows into said second volute (102) when said volute valve (104) is opened, said turbine housing (103) having an asymmetric shape defined by the smaller and larger sizes of said first and second volutes (101) and (102) respectively which are angled toward said turbine wheel (108), said turbine wheel (108) being formed as a mixed flow turbine wheel, and wherein said first and second volutes (101) and (102) are asymmetric in size and orientation relative to said mixed flow wheel (108) such that said larger second volute (102) accommodates greater exhaust gas flows in comparison to said first volute (101) and wherein said turbocharger (100) has no wastegate. - View Dependent Claims (2, 3, 4, 5)
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6. A turbocharger (100) comprising:
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a turbine stage (105) having a turbine housing (103), a turbine wheel (108) rotatably disposed therein, said turbine housing (103) defining a first volute (101) and a second volute (102), the first volute (101) being smaller in size than the second volute (102), and which are separated from each other by a volute wall (107) in a twin scroll configuration, said first and second volutes (101) and (102) each discharging toward said turbine wheel (108), and a volute valve (104) provided in said volute wall (107) wherein said first and second volutes (101) and (102) are supplied with exhaust gas through a turbine inlet (106) wherein substantially all of said exhaust gas received in said turbine inlet (106) is directed to said first and second volutes (101) and (102), said turbine housing (103) has an asymmetric shape defined by the smaller and larger sizes of said first and second volutes (101) and (102) respectively which are angled toward said turbine wheel (108), said first and second volutes (101) and (102) are asymmetric in size and orientation relative to said turbine wheel (108) such that said larger second volute (102) accommodates increased exhaust gas flows in comparison to said first volute (101). - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A turbocharger (100) comprising:
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a turbine housing (103) and a turbine wheel (108) rotatably disposed therein, said turbine housing (103) defining a first volute (101) and a second volute (102), the first volute (101) being smaller in size than the second volute (102), and which are separated from each other by a volute wall (107) in a twin scroll configuration, said first and second volutes (10.1) and (102) each discharging into said turbine housing (103) toward said turbine wheel (108), and a volute valve (104) provided in said volute wall (107) wherein said first and second volutes (101) and (102) are supplied with exhaust gas through a turbine inlet (106) wherein all of said exhaust gas received in said turbine inlet (106) is directed to said first and second volutes (101) and (102), said second volute (102) being selectively closed and opened by said volute valve (104) wherein as said volute valve (104) is moved from a closed position to an open-position all of said exhaust gas initially flows exclusively into said first volute (101) and subsequently a portion of said exhaust gas flows into said second volute (102), said turbine housing (103) having an asymmetric shape defined by the smaller and larger sizes of said first and second volutes (101) and (102) respectively which are angled toward said turbine wheel (108), said turbine wheel (108) being formed as a mixed flow turbine wheel (108) wherein said first and second volutes (101) and (102) are asymmetric in size and orientation relative to said mixed flow wheel (108) such that said larger second volute (102) accommodates rated power and greater exhaust gas flows in comparison to said first volute (101), wherein said turbocharger (100) has no wastegate, said volutes (101) and (102) being asymmetrically leaned toward a bearing housing side of said turbine housing (103) so as to have an asymmetric shape defined by the smaller and larger sizes of the volutes (101) and (102), and said first and second volutes (101) and (102) discharging toward said turbine wheel (108) with both a radially inwardly directed component and an axially directed component wherein said axially directed component corresponds to an axial flow component of said mixed flow turbine wheel (108). - View Dependent Claims (14, 15)
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Specification