Turbocharger assembly

Patent metadata

Field	Value
Publication number	US-2019277159-A1
Application number	US-201815916331-A
Country	US
Kind code	A1
Filing date	Mar 9, 2018
Priority date	Mar 9, 2018
Publication date	Sep 12, 2019
Grant date	—

Abstract

A turbocharger assembly includes a center housing which defines a bore, a journal bearing, and a rotating assembly. The bore further defines primary and secondary annular grooves. The journal bearing may be disposed within the bore such that the annular groove encircles the journal bearing and feeds the fluid thereto. The rotating assembly includes a shaft, a turbine wheel and a compressor wheel. The turbine wheel is configured to be driven by the post-combustion gasses while the compressor wheel pressurizes the airflow for delivery to a combustion chamber. The shaft may be supported by one or more journal bearings for rotation within the bore about a longitudinal axis. The shaft includes a shaft surface which defines a standard region and a feature in a feature region. The feature is configured to generate a plurality of fictitious forces which stabilizes the turbocharger shaft.

First claim

What is claimed is:

1 . A turbocharger assembly for a vehicle comprising:
a turbocharger housing; a bore defined by the turbocharger housing, a journal bearing disposed within the bore; and a rotating assembly having a shaft with a turbine wheel on a first end of the shaft and a compressor wheel on a second end of the shaft, the shaft being supported by an oil film in a journal bearing for rotation within the bore about a longitudinal axis; wherein the shaft defines a standard region and a feature in a feature region, the feature being one of a recess or a lobe configured to generate a plurality of fictitious forces which stabilize the shaft within the journal bearing.

2 . The turbocharger assembly as defined in claim 1 wherein the standard region and the feature region are integral to one another.

3 . The turbocharger assembly as defined in claim 2 wherein the feature region engages with an oil film disposed along an inner surface of the journal bearing.

4 . The turbocharger assembly as defined in claim 3 wherein the shaft defines a plurality of features.

5 . The turbocharger assembly as defined in claim 3 wherein the feature is a recess with a minimum radius length which is less than a standard radius length in the standard region.

6 . The turbocharger assembly as defined in claim 4 wherein a lobe is defined between each feature.

7 . The turbocharger assembly as defined in claim 5 wherein the feature is a recess having a feature radius length which is greater than the minimum recess radius length.

8 . The turbocharger assembly as defined in claim 4 wherein the feature is a recess, the recess having a minimum recess radius length which is less than a standard radius length in the standard region.

9 . The turbocharger assembly as defined in claim 5 wherein the recessed region is one of an oil dam, a slot, and a flat.

10 . The turbocharger assembly as defined in claim 8 wherein the recessed region is one of an oil dam, a slot, and a flat.

11 . The turbocharger assembly as defined in claim 8 wherein the shaft defines an oval cross-section.

12 . The turbocharger assembly as defined in claim 5 wherein the minimum radius length is less than the standard radius length by a first radial difference which falls within a range of about 0.1 microns to about 5 microns.

13 . The turbocharger assembly as defined in claim 6 wherein the minimum radius length is less than the standard radius length by a first radial difference which falls within a range of about 0.1 microns to about 5 microns.

14 . The turbocharger assembly as defined in claim 9 wherein the minimum recess radius length is less than the standard radius length by a second radial difference which falls within the range of about 10 microns to about 0.1 microns.

15 . The turbo charger assembly as defined in claim 10 wherein the minimum recess radius is less than the standard radius length by a second radial difference which falls within the range of about 10 microns to about 0.1 microns.

16 . The turbo charger assembly as defined in claim 11 wherein the minimum recess radius is less than the standard radius length by a second radial difference which falls within the range of about 10 microns to about 0.1 microns.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Huang Yuli
• Shi Fanghui
• Liu Yuchuan
• Yang Bo
• Begin Louis P

Classifications

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• F04D29/053

  Shafts · CPC title

• F02B39/14

  Lubrication of pumps; Safety measures therefor · CPC title

• F02B39/00

  Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 · CPC title

• F04D29/056

  Bearings · CPC title