VANE TRAVEL ADJUSTMENT SCREW

• US 20120279217A1
• Filed: 12/07/2009
• Published: 11/08/2012
• Est. Priority Date: 12/07/2009
• Status: Active Grant

• Current Assignee: Volvo Lastvagnar AB (Volvo AB)
• Original Assignee: Volvo Lastvagnar AB (Volvo AB)
• Inventors: Eriksson, Pontus
• Granted Patent: US 9,103,229 B2
• Time in Patent Office: Days
• US Class Current: 60/605.1
• 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: F01D 17/20 Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted sensing elements alone F01D17/02; final actuators alone F01D17/10
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes

Abstract

An arrangement is provided for controlling a variable position of vanes at a turbine in a flow channel of a turbine. The arrangement includes a nozzle ring carrying a set of vanes, each of the vanes being connected to a vane pin housed in the nozzle ring. A rotational position of the vanes is accomplished via a vane displacement drive train including a pivotally supported pivot axle, a first actuator arm arranged on the pivot axle, which first arm is connectable to a drive actuator, a second actuator arm arranged on the pivot axle, which second arm is connected to a pin engaged with an unison ring for pivoting the unison ring, and a vane arm being connected to each vane pin and the unison ring for displacement of the vanes via pivotal displacement of the unison ring, and wherein a stop screw is arranged for limiting the pivotal displacement of the vanes.

Claims

1. Arrangement for controlling a variable position of a set of vanes in a flow channel of a turbine, the arrangement including a nozzle ring carrying the set of vanes, each of the vanes being connected to a vane pin housed in the nozzle ring, and a vane displacement drive train arranged to control a rotational position of the vanes in the flow channel, the vane displacement drive train including the following members:

a pivotally supported pivot axle, a first actuator arm arranged on the pivot axle, which first actuator arm is connectable to a drive actuator, a second actuator arm arranged on the pivot axle, which second actuator arm is connected to a pin engaged with an unison ring for pivoting the unison ring, and a vane arm being connected to each vane pin and the unison ring for displacement of the vanes via pivotal displacement of the unison ring,

and wherein a stop screw is arranged for limiting the pivotal displacement of the vanes, the first actuator arm is located outside an enclosure forming a cavity in which the unison ring is located and is externally accessible for the drive actuator and the second actuator arm being positioned inside the enclosure, wherein the stop screw is arranged to limit the displacement of a member in the vane displacement drive train which is located closer to the vane pin in the vane displacement drive train than the pivot axle, and in that the stop screw extends though the enclosure to define an end stop for the member in the vane displacement drive train which the stop screw engages with.

2. Arrangement for controlling a variable position of vanes according to claim 1, wherein the stop screw is arranged to limit the displacement of the second actuator arm.

3. Arrangement for controlling a variable position of vanes according to claim 1, wherein the stop screw is arranged to limit the displacement of the the unison ring.

4. Arrangement for controlling a variable position of vanes according to claim 1, wherein the stop screw is arranged to limit the displacement of the vane arm.

5. Arrangement for controlling a variable position of vanes according to claim 1, wherein a turbine inlet is defined in a turbine housing, a flange member is attached to the turbine housing, the flange member and/or the turbine housing defining the enclosure.

6. Arrangement for controlling a variable position of vanes according to claim 1, wherein the stop screw is attached in a bore arranged in a flange member or a turbine housing.

7. Arrangement for controlling a variable position of vanes according to claim 6, wherein the flange member and/or turbine housing are cast elements and that a seating (47) for the stop screw is integrally formed in one of the cast elements.

8. A turbocharger for an engine including:

a turbine rotatably mounted on a shaft,

a compressor impeller mounted on a shaft,

a compressor housing having an inlet and an outlet and enclosing the compressor impeller,

a center housing including bearing means for rotatably supporting the turbine shaft and compressor shaft,

a turbine housing including an inlet and an outlet, the turbine housing forming a volute (16) therein for directing exhaust gas from an engine through an annular passage to the turbine,

a flange member mounted between the center housing and the turbine housing, and

an arrangement for controlling a variable position of vanes in an annular passage, the arrangement including

a nozzle ring carrying the set of vanes. each of the vanes being connected to a vane pin housed in the nozzle rine, and a vane displacement drive train arranged to control a rotational position of the vanes in the flow channel, the vane displacement drive train including the following members;

a pivotally supported pivot axle, a first actuator arm arranged on the pivot axle, which first actuator arm is connectable to a drive actuator, a second actuator arm arranged on the pivot axle, which second actuator arm is connected to a pin engaged with an unison ring for pivoting the unison ring, and a vane arm being connected to each vane pin and the unison ring for displacement of the vanes via pivotal displacement of the unison ring,

and wherein a stop screw is arranged for limiting the pivotal displacement of the vanes, the first actuator arm is located outside an enclosure forming a cavity in which the unison ring is located and is externally accessible for the drive actuator and the second actuator arm being positioned inside the enclosure, wherein the stop screw is arranged to limit the displacement of a member in the vane displacement drive train which is located closer to the vane pin in the vane displacement drive train than the pivot axle, and in that the stop screw extends though the enclosure to define an end stop for the member in the vane displacement drive train which the stop screw engages with.

9. An engine including a turbocharger according to claim 8.