Controlled turbocharger with integrated bypass

• US 20040244373A1
• Filed: 05/03/2004
• Published: 12/09/2004
• Est. Priority Date: 11/02/2001
• Status: Active Grant

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: Frankenstein, Dirk, McKinley, Steve
• Granted Patent: US 6,983,596 B2
• Time in Patent Office: Days
• US Class Current: 60/602
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A rotary valve (1) particularly suitable for use in a turbocharger for an internal-combustion engine, the rotary valve provided between a turbocharger inlet port (10) and at least first and second scroll passages (13, 14), the rotary valve rotatable between (a) a position at which at least one scroll passage is blocked and a bypass outlet is blocked, (b) a position at which no scroll passage is blocked and the bypass outlet is blocked, and (c) a position at which no scroll passage is blocked and the bypass outlet is not blocked. The control valve is rotatable about a central axis, includes a disk-shaped base (2) and a control surface (4) provided upon said base, the control surface preferably being generally wedge shaped, and the disk optionally having an aperture (7) for communication with the bypass outlet. The rotary valve is preferably mounted on both sides via a shaft (112a, 112b) extending through the axis of rotation.

Claims

1. A turbocharger comprising:

a turbine wheel (9);

a turbine casing (8) defining a turbine wheel chamber having a wheel chamber inlet port and an outlet port, said turbine casing further including;

at least one casing inlet port (10) for receiving exhaust gas,

at least first and second scroll passages (13, 14) open toward an inlet port of a turbine wheel chamber and dimensioned for directing exhaust gas flow from said casing inlet port to said turbine wheel chamber,

at least one upstream casing outlet upstream of said turbine wheel,

at least one downstream casing outlet downstream of said turbine wheel for discharging exhaust gas from said turbine wheel chamber; and

a rotary control valve (1) provided between said casing inlet and said at least first and second scroll passages, said rotary control valve rotatable between (a) a position at which at least one scroll passage is blocked and said upstream casing outlet is blocked, (b) a position at which no scroll scroll is blocked and said upstream casing outlet is blocked, and (c) a position at which no scroll passage is blocked and said upstream casing outlet is not blocked,

wherein said control valve is rotatable about a central axis, said valve including a disk-shaped base (2) and a control surface (4) provided upon said base, said control surface for selectively blocking or exposing at least one of said first and second scroll passages, said disk including an aperture (7) which can be positioned in registry with said outlet upstream of said turbine wheel for permitting exhaust gas flow to bypass said turbine wheel (9).

2. A turbocharger as in claim 1, wherein said first scroll passage is larger in cross-section than said second scroll passage.

3. A turbocharger as in claim 1, wherein said first scroll passage opens into the turbine wheel chamber via an opening which is larger than the opening with which the second scroll passage opens into the turbine wheel chamber.

4. A turbocharger as in claim 1, wherein said rotary valve control surface (4) is in the form of a sharp wedge, a blunted wedge, or a hyperbolic curve.

5. A turbocharger as in claim 1, wherein said control surface (4) includes a leading edge (5) which extends over the axis of rotation of the rotary valve, and an arcuate trailing edge (6) concentric with said axis of rotation and adapted for passing with close tolerance to the spiral channel inlet openings.

6. A turbocharger as in claim 1, wherein said rotary valve includes a shaft (112a, 112b) extending from opposite sides of said rotary valve (1), and wherein said shaft is rotatably mounted to said turbine casing (8) via said shaft at said opposite sides of said rotary valve.

7. A turbocharger as in claim 1, wherein said opening into said turbine wheel chamber extends approximately once around said turbine wheel.

8. A turbine according to claim 1, wherein the width of said opening into said turbine wheel chamber is constant substantially over the full length of said opening.

9. A turbine according to claim 1, wherein said first and second scroll passages are divided by a partition wall substantially normal to the axis of said turbine wheel.

10. A turbocharger comprising:

a turbine wheel (9);

a turbine casing (8) defining a turbine wheel chamber having a wheel chamber inlet port and an outlet port, said turbine casing further including;

at least one casing inlet port (10) for receiving exhaust gas,

at least first and second scroll passages (13, 14) respectively open toward an inlet port of a turbine wheel chamber and dimensioned for directing exhaust gas flow from said casing inlet port (10) to said turbine wheel chamber,

at least one upstream casing outlet upstream of said turbine wheel,

at least one downstream casing outlet downstream of said turbine wheel for discharging exhaust gas from said turbine wheel chamber; and

a rotary valve (1) provided between said casing inlet and said at least first and second scroll passages (13, 14), said rotary control valve (1 ) rotatable between (a) a position at which at least one scroll passage is blocked and said upstream casing outlet is blocked, (b) a position at which no scroll passage is blocked and said upstream casing outlet is blocked, and (c) a position at which no scroll passage is blocked and said upstream casing outlet is not blocked,

wherein said rotary valve (1) is rotatable about-a central axis, said valve including a disk-shaped base (2) and a control surface provided upon said base (4), said control surface dimensioned for selectively blocking at least one of said first and second scroll passages and said upstream casing outlet.

11. A turbocharger as in claim 10, wherein said first scroll passage is larger than said second scroll passage.

12. A turbocharger as in claim 10, wherein said first scroll passage opens into the turbine wheel chamber via an opening which is larger than the opening with which the second scroll passage opens into the inlet port of a turbine wheel chamber.

13. A turbocharger as in claim 10, wherein said rotary valve control surface is in the form of a sharp wedge, a blunted wedge, or a hyperbolic curve.

14. A turbocharger as in claim 10, wherein said control surface (4) includes a leading edge (5) which extends over the axis of rotation of the rotary valve, and an arcuate trailing edge (6) concentric with said axis of rotation and adapted for passing with close tolerance to the spiral channel inlet openings.

15. A turbocharger as in claim 10, wherein said rotary valve (1) includes a shaft (112a, 112b) extending from opposite sides of said rotary valve, and wherein said shaft is rotatably mounted to said turbine casing (8) via said shaft at said opposite sides of said rotary valve.

16. A turbocharger as in claim 10, wherein said opening into said turbine wheel chamber extends approximately once around said turbine wheel.

17. A turbine according to claim 10, wherein the width of said opening into said turbine wheel chamber is constant substantially over the full length of said opening.

18. A turbine according to claim 10, wherein said first and second scroll passages are divided by a partition wall substantially normal to the axis of said turbine wheel.