A variable geometry turbocharger assembly employing the present invention includes
a center housing, a compressor housing attached to one side of the center housing,
and a turbine housing attached to another side of the center housing. A plurality
of movable vanes is disposed within the turbine housing, and a unison ring is rotatably
disposed within the turbine housing to move the vanes in unison. The turbocharger
includes a unison ring assembly of this invention that includes an insert that
is separate from and attached to the center housing. The support has one or more
surfaces to carry the unison ring, and the unison ring is rotatably positioned
on the support. The support further provides a space that isolates the unison ring
from making contact with contacting the center housing. A heat shroud optionally
extends radially inwardly along the center housing and is retained into position
by the support.
