Variable nozzle for a turbocharger, having nozzle ring located by radial members
A variable nozzle for a turbocharger ( 10 ) has a nozzle ring ( 138 ) supporting an array of vanes ( 134 ) that are variable in setting angle. The nozzle ring ( 138 ) is rotationally oriented and fixed in position by a plurality of circumferentially spaced, radially outwardly extending locating members ( 170 ) that engage corresponding locating grooves ( 159 ) in a flange member ( 157 ) of the turbocharger.
1. A variable nozzle for a turbocharger, comprising:
a generally annular nozzle ring supporting an array of vanes circumferentially spaced about a central axis of the nozzle ring, each vane being rotatably mounted to the nozzle ring such that the vane is pivotable about a pivot axis of the vane, the nozzle ring having a first side facing the vanes and an opposite second side, and having a radially outer edge surface extending between the first and second sides;
an insert having a tubular portion for being sealingly received into a bore of a turbine housing and having a nozzle portion extending generally radially out from one end of the tubular portion, a generally annular flange portion disposed radially outwardly of and axially spaced from the nozzle portion, a plurality of spacers extending between and connecting the nozzle portion of the insert and the nozzle ring, with the first side of the nozzle ring facing a first side of the nozzle portion of the insert;
a plurality of locating members affixed to the nozzle ring, each locating member extending in a generally radially outward direction beyond the radially outer edge surface of the nozzle ring, the locating members being circumferentially spaced apart from one another; and
locating grooves formed in the flange portion of the insert and circumferentially spaced apart in correspondence with the circumferential spacing of the locating members, each locating groove extending in a generally radially outward direction, and the locating members being seated in the locating grooves so as to rotationally orient and fix the nozzle ring with respect to the insert.
2. The variable nozzle of claim 1 , wherein the flange portion is connected to the nozzle portion by a plurality of circumferentially spaced portions.
3. The variable nozzle of claim 1 , wherein the locating members comprise locating pins mounted in holes formed in the radially outer edge surface of the nozzle ring.
4. The variable nozzle of claim 1 , wherein the locating members and locating grooves are non-uniformly spaced circumferentially.