Exhaust-gas turbocharger
First Claim
1. An exhaust-gas turbocharger (1) comprisinga compressor (2) having a compressor wheel (3),a turbine (4) having a turbine wheel (5) and a turbine housing (6) having a turbine outlet,a shaft (7), which connects the compressor wheel (3) to the turbine wheel (5), anda number of channels (13, 14) formed in the turbine housing (6) for guiding the exhaust gas onto the turbine wheel (5),whereinan axial direction (8) is defined along the shaft (7), a radial direction (9) is defined perpendicularly to the axial direction (8), and a circumferential direction (10) is defined around the axial direction (8),each channel (13, 14) directs flow against the turbine wheel (5),the turbine wheel (5) comprises ≥
- 10 turbine blades (12),the turbine blades (12) are main blades (22) and intermediate blades (23), wherein the intermediate blades (23) do not extend as far toward the turbine outlet, as seen in the axial direction (8), as the main blades (22), anda dedicated volute (15, 16) is formed in the turbine housing (6) for each channel (13, 14), wherein a radial inner side of each volute (15, 16) terminates with a tongue (17), and a neck cross-sectional area (A1) of the respective channel is determined across the channel at a tip (18) of the tongue (17), and a flow-outlet cross-sectional area (A2) is determined at the turbine outlet, and wherein flow-outlet cross-sectional area (A2) / neck cross-sectional area (A1) ≥
the number of channels·
0.9.
1 Assignment
0 Petitions
Accused Products
Abstract
An exhaust-gas turbocharger, preferably for a passenger vehicle, including a turbine having a turbine wheel and a turbine housing. A number of S≥2 of channels are formed in the turbine housing and are intended for guiding the exhaust gas onto the turbine wheel. Each channel directs flow against the turbine wheel over the entire width of the latter, as seen in the axial direction, and over a segment, as seen in relation to the circumferential direction. The turbine wheel has a number of Z≥10 turbine blades. The turbine blades are defined in the form of main blades and intermediate blades. The intermediate blades, at least at their hub-side ends, do not extend as far toward the turbine outlet, as seen in the axial direction, as the main blades.
21 Citations
6 Claims
-
1. An exhaust-gas turbocharger (1) comprising
a compressor (2) having a compressor wheel (3), a turbine (4) having a turbine wheel (5) and a turbine housing (6) having a turbine outlet, a shaft (7), which connects the compressor wheel (3) to the turbine wheel (5), and a number of channels (13, 14) formed in the turbine housing (6) for guiding the exhaust gas onto the turbine wheel (5), wherein an axial direction (8) is defined along the shaft (7), a radial direction (9) is defined perpendicularly to the axial direction (8), and a circumferential direction (10) is defined around the axial direction (8), each channel (13, 14) directs flow against the turbine wheel (5), the turbine wheel (5) comprises ≥ - 10 turbine blades (12),
the turbine blades (12) are main blades (22) and intermediate blades (23), wherein the intermediate blades (23) do not extend as far toward the turbine outlet, as seen in the axial direction (8), as the main blades (22), and a dedicated volute (15, 16) is formed in the turbine housing (6) for each channel (13, 14), wherein a radial inner side of each volute (15, 16) terminates with a tongue (17), and a neck cross-sectional area (A1) of the respective channel is determined across the channel at a tip (18) of the tongue (17), and a flow-outlet cross-sectional area (A2) is determined at the turbine outlet, and wherein flow-outlet cross-sectional area (A2) / neck cross-sectional area (A1) ≥
the number of channels·
0.9. - View Dependent Claims (2, 3, 4, 5)
- 10 turbine blades (12),
-
6. An exhaust-gas turbocharger (1) comprising
a compressor (2) having a compressor wheel (3), a turbine (4) having a turbine wheel (5) and a turbine housing (6) having a turbine outlet, a shaft (7), which connects the compressor wheel (3) to the turbine wheel (5), and a number of channels (13, 14) formed in the turbine housing (6) for guiding the exhaust gas onto the turbine wheel (5), wherein an axial direction (8) is defined along the shaft (7), a radial direction (9) is defined perpendicularly to the axial direction (8), and a circumferential direction (10) is defined around the axial direction (8), each channel (13, 14) directs flow against the turbine wheel (5), the turbine wheel (5) comprises ≥ - 10 turbine blades (12),
the turbine blades (12) are main blades (22) and intermediate blades (23), wherein the intermediate blades (23) do not extend as far toward the turbine outlet, as seen in the axial direction (8), as the main blades (22), a radial inner side of each volute (15, 16) terminates with a tongue (17) and associated tip (18), the tip (18) of the tongue of one volute (15) forms a geometrical reference point and, starting from this reference point, the next channel (14) terminates at 360°
/the number of turbine wheel blades [Z], as measured in the circumferential direction (10),the tip (18) of the tongue of this next volute (16) is shortened by an angle α
in the circumferential direction (10), and(360°
/number of turbine wheel blades [Z])−
5°
α
≥
5°
.
- 10 turbine blades (12),
Specification