Turbocharger with nozzle ring coupling

Details Turbocharger with nozzle ring coupling Turbocharger with nozzle ring coupling

2000-05-10

2001-09-11

Denion, Thomas (Department: 3748)

Pumps

Motor driven

Fluid motor

C415S209100, C415S211200, C415S189000, C415S211200, C415S209200, C415S170100

Reexamination Certificate

active

06287091

ABSTRACT:

TECHNICAL FIELD
This invention relates to engine exhaust driven turbochargers and more particularly to a turbocharger with a turbine nozzle ring axially aligned by coupling means including radial guides.
BACKGROUND OF THE INVENTION
It is known in the art to provide an engine turbocharger with a nozzle ring having stator blades that direct entering exhaust gas angularly against energy converting blades of a turbine wheel. The nozzle ring may also include a shroud surrounding the turbine wheel. Simple coupling means are desired for mounting of a turbocharger nozzle ring in a manner to maintain axial alignment with the turbine wheel while permitting relative thermal expansion of the connecting components.
SUMMARY OF THE INVENTION
The present invention provides an engine turbocharger having a turbine nozzle ring that defines an annular passage. An inlet end of the nozzle ring is positioned to receive exhaust gas from turbine inlet means such as an inlet scroll. An outlet end of the nozzle ring includes a shroud closely surrounding the turbine wheel. Stator blades are provided between the ends for directing exhaust gas angularly against energy converting blades of the turbine wheel.
In a preferred embodiment, the nozzle ring includes seal rings at its inlet end to seal inner and outer edges of the nozzle ring against leakage of pressurized exhaust gas. Preferably, the seal rings also act as axial springs to bias the outlet end of the nozzle ring against a nozzle retainer assembly, which acts as a stop. At the outlet end of the nozzle ring, radial guides centered on the axis of the turbocharger rotor engage radial guide means connected with an associated exhaust duct to maintain axial alignment of the nozzle ring with the axis of the rotor. The guides are preferably key and slot means acting between the connecting members. At least three radially directed keys may be provided on the nozzle ring. The keys are engagable with mating radial slots formed in a support carried by the exhaust duct with which the nozzle ring is connected. The radial guides provide the sole means of alignment and support of the nozzle ring with no need for pilots or other alignment aids. When exhaust gas has passed through the turbine shroud and turbine blades, openings in the exhaust duct allow the hot exhaust gas to circulate around the members supporting the nozzle ring in order to minimize thermal gradients between the nozzle ring flanges and vanes or stator blades.
These and other features and advantages of the invention will be more fully understood from the following description of certain specific embodiments of the invention taken together with the accompanying drawings.


REFERENCES:
patent: 3778194 (1973-12-01), Miller et al.
patent: 4392778 (1983-07-01), Bless
patent: 4492517 (1985-01-01), Klompas
patent: 5129783 (1992-07-01), Hayton
patent: 5807072 (1998-09-01), Payling
patent: 5868553 (1999-02-01), Battig et al.
patent: 6168375 (2001-01-01), LaRue et al.

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