VNT FLOW CALIBRATION ADJUSTMENT

• US 20090301083A1
• Filed: 06/04/2008
• Published: 12/10/2009
• Est. Priority Date: 06/04/2008
• Status: Active Grant

• Current Assignee: Garrett Transportation I Inc. (Garrett Motion, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Li, Songter, Rayner, Patrick, Li, Laurent
• Granted Patent: US 8,122,716 B2
• Time in Patent Office: Days
• US Class Current: 60/602
• CPC Class Codes: F01D 17/165 for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line F01D17/167 takes precedence
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F05D 2260/56 using cams or eccentrics
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An exemplary variable geometry turbine includes a turbine wheel; a variable geometry assembly that includes a rotatable control ring that has a slot and a plurality of vanes where each vane has a post pivotably controlled by rotation of the control ring and where adjacent vanes define nozzles to direct exhaust gas to the turbine wheel; a crankshaft that has a pin for receipt by the slot of the control ring where rotation of the crankshaft rotates the control ring; and a center housing that includes a rotatable stop fixed to the crankshaft and having a close stop surface, a secure component and a translatable shaft where the translatable shaft comprises an engagement mechanism to engage the rotatable stop; where translation of the shaft causes rotation of the crankshaft and where the close stop surface establishes a contact with the secure component to limit rotation of the crankshaft and to establish a closed limit for the vanes. Various other exemplary methods, devices, systems, etc., are also disclosed.

Claims

1. A stop for limiting rotation of a crankshaft for adjusting geometry of a variable geometry turbine, the stop comprising:

an aperture for receiving the crankshaft wherein the crankshaft has a rotational axis and wherein the aperture is centered on the rotational axis; and

a close stop surface extending from a first radius from the rotational axis to a second radius from the rotational axis, the close stop surface having a width in the axial direction;

wherein the close stop surface establishes a contact with a secured component set in a center housing of a turbocharger to limit rotation of the crankshaft and, correspondingly, to establish a close position for the variable geometry turbine.

2. The stop of claim 1 further comprising a cam.

3. The stop of claim 2 wherein the cam comprises an aperture for receiving the crankshaft wherein the aperture is centered on the rotational axis of the crankshaft.

4. The stop of claim 1 further comprising an open stop surface that establishes a contact with the secured component set in the center housing of the turbocharger to limit rotation of the crankshaft and, correspondingly, to establish an open position for the variable geometry turbine.

5. The stop of claim 4 wherein an angle θ

exists between the close stop surface and the open stop surface upon establishment of their respective contacts with the secured component.

6. The stop of claim 5 wherein adjustment of the secured component alters the angle θ

.

7. The stop of claim 1 further comprising an engagement mechanism.

8. A variable geometry turbine comprising:

a turbine wheel;

a variable geometry assembly that comprises a rotatable control ring that comprises a slot and a plurality of vanes wherein each vane comprises a post pivotably controlled by rotation of the control ring and wherein adjacent vanes define nozzles to direct exhaust gas to the turbine wheel;

a crankshaft that comprises a pin for receipt by the slot of the control ring wherein rotation of the crankshaft rotates the control ring; and

a center housing that comprises a rotatable stop fixed to the crankshaft and having a close stop surface, a secure component and a translatable shaft wherein the translatable shaft comprises an engagement mechanism to engage the rotatable stop;

wherein translation of the shaft causes rotation of the crankshaft and wherein the close stop surface establishes a contact with the secure component to limit rotation of the crankshaft and to establish a closed limit for the vanes.

9. The variable geometry turbine of claim 8 further comprising a cam fixed to the crankshaft wherein the cam cooperates with a vane position sensor.

10. The variable geometry turbine of claim 8 further comprising an open stop surface that establishes a contact with the secured component to limit rotation of the crankshaft and to establish an open limit for the vanes.

11. The variable geometry turbine of claim 10 wherein an angle e exists between the close stop surface and the open stop surface upon establishment of their respective contacts with the secured component.

12. The variable geometry turbine of claim 11 wherein adjustment of the secured component alters the angle e.

13. A method comprising:

actuating a variable geometry turbine controller to arrive at a close position;

in response to the actuating, rotating a stop fixed to a crankshaft positioned in a center housing of the variable geometry turbine; and

in response to the rotating, contacting the stop and a secure component set in the center housing to stop the rotation of the crankshaft and to arrive at the close position of the variable geometry turbine.

14. The method of claim 13 further comprising:

actuating a variable geometry turbine controller to arrive at an open position;

in response to the actuating, rotating a stop fixed to a crankshaft positioned in a center housing of the variable geometry turbine; and

in response to the rotating, contacting the stop and a secure component set in the center housing to stop the rotation of the crankshaft and to arrive at the open position of the variable geometry turbine.

15. The method of claim 13 wherein the rotating comprises rotating a cam fixed to the crankshaft.

16. The method of claim 15 further comprising sensing the position of the cam.

17. The method of claim 13 further comprising adjusting the position of the secured component to thereby alter the close position.

18. The method of claim 17 wherein the adjusting comprises adjusting to target an emission standard.

19. The method of claim 13 wherein the contacting prevents downstream components of the variable geometry turbine from experiencing torque and associated wear.

20. The method of claim 13 wherein the actuating occurs in response to an operational condition of an internal combustion engine.