Adjustment mechanism for an inlet flow section of a compressor wheel of a turbocharger
View Patent ↗An adjustment mechanism for an air inlet flow section of a compressor wheel of a turbocharger. The adjustment mechanism defines a variable inlet diameter for an axial air flow to the compressor wheel. The adjustment mechanism has a unison ring and a plurality of vanes. An actuator is used for providing a first pivoting motion to the unison ring about a central axis and thereby providing a second pivoting motion to the plurality of vanes. At least one elastic biaser is arranged, such that it provides, upon the pivoting motion to the unison ring, a restoring force to the unison ring and/or the plurality of vanes. The pivoting motion of the vanes adjusts the inlet diameter of the axial air flow to the compressor wheel.
1. An adjustment mechanism for an inlet flow section of a compressor wheel of a turbocharger for defining a variable inlet diameter for an axial air flow to the compressor wheel, the adjustment mechanism comprising:
an unison ring arranged in the air inlet flow section prior to the compressor wheel in a direction of the axial air flow;
a plurality of vanes being pivotably mounted and mechanically linked to the unison ring;
an actuator for providing a first pivoting motion to the unison ring about a central axis and thereby providing a second pivoting motion to the plurality of vanes which set the variable inlet diameter; and
at least one elastic biaser arranged between the unison ring and at least one of the plurality of vanes such that the elastic biaser provides, upon the first pivoting motion to the unison ring, a restoring force to the unison ring and the at least one of the plurality of vanes.
2. The adjustment mechanism as claimed in claim 1 , wherein the at least one elastic biaser arranged between the unison ring and each of the plurality of vanes is a second spring element.
3. The adjustment mechanism as claimed in claim 1 , wherein the at least one elastic biaser is attached to the unison ring and the housing of the turbocharger, and at least one of the at least one elastic biaser is arranged between the unison ring and each of the plurality of vanes.
4. The adjustment mechanism as claimed in claim 3 , wherein the at least one elastic biaser attached to the unison ring and the housing is at least one first spring element and the at least one elastic biaser arranged between the unison ring and each of the plurality of vanes is at least one second spring element.
5. The adjustment mechanism as claimed in claim 1 , wherein each vane is mounted pivotably about a pivot point and mechanically linked to an inner circumference of the unison ring.
6. The adjustment mechanism as claimed in claim 5 , wherein the mechanical link is provided by a nose of each vane, wherein each nose reaches in a corresponding recess formed at an inner circumference of the unison ring.
7. The adjustment mechanism according to claim 4 , wherein the first spring element and/or the second spring element is a spring adapted to be compressed.
8. A turbocharger comprising the adjustment mechanism as claimed in claim 1 .
9. A vehicle comprising:
an internal combustion engine; and
a turbocharger comprising the adjustment mechanism as claimed in claim 1 .