Turbocharger center housing
View Patent ↗An assembly can include a compressor backplate; a bearing boss that extends axially from the compressor backplate and that includes an outer surface and male coupling features disposed along the outer surface; and a casing that includes a compressor end, a bearing boss opening at the compressor end, a turbine end, an inner surface located between the compressor end and the turbine end and female coupling features disposed along a portion of the inner surface, the male coupling features and the female coupling features configured to couple the bearing boss to the casing. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.
1. An assembly comprising:
a compressor backplate;
a cylindrical wall, integral to the compressor backplate, that extends axially from the compressor backplate and that comprises an outer surface that comprises male coupling features;
a bearing boss, integral to the compressor backplate, that extends axially from the cylindrical wall and that comprises ribs that extend radially outwardly from the bearing boss to increase heat transfer surface area; and
a casing that comprises a compressor end, a turbine end, an inner surface located between the compressor end and the turbine end and female coupling features disposed along a portion of the inner surface, the male coupling features and the female coupling features configured to couple the cylindrical wall to the casing to define a cavity wherein the ribs of the bearing boss increase path length of lubricant flow in the cavity and wherein the male coupling features and the female coupling features comprise threads;
wherein the bearing boss comprises a bore, wherein the casing comprises a bore coaxially aligned with the bore of the bearing boss and wherein a clearance exists between a turbine side surface of the bearing boss and an inner surface of the casing disposed about the bore of the casing to hinder transfer of heat energy to the bearing boss.
2. The assembly of claim 1 wherein the compressor backplate, the cylindrical wall and the bearing boss are a cast component.
3. The assembly of claim 2 wherein the casing is a cast casing.
4. The assembly of claim 2 wherein the male coupling features are machined into the cast component.
5. The assembly of claim 3 wherein the female coupling features are machined into the cast casing.
6. The assembly of claim 1 wherein the bearing boss comprises a lubricant passage and wherein the casing comprises a pin passage and further comprising a pin configured for receipt by the pin passage and at least partially by the lubricant passage.
7. The assembly of claim 1 wherein the casing comprises one or more flange features for operatively coupling the casing to a turbine housing.
8. The assembly of claim 1 wherein the bore of the bearing boss comprises a portion configured for receipt of a journal bearing and a portion configured for receipt of a collar.
9. The assembly of claim 8 further comprising the journal bearing and the collar.
10. The assembly of claim 9 further comprising a shaft coupled to a turbine wheel wherein the journal bearing is received by the bore of the bearing boss and wherein the shaft is supported by the journal bearing.
11. The assembly of claim 8 wherein the bearing boss comprises a lubricant passage that extends from the portion of the bore of the bearing boss configured for receipt of a journal bearing.
12. The assembly of claim 8 wherein the bearing boss comprises a lubricant passage that extends from the portion of the bore of the bearing boss configured for receipt of a collar.
13. The assembly of claim 1 further comprising a locating pin for locating a bearing in the bore of the bearing boss.
14. A method comprising:
casting a backplate, a cylindrical wall and a bearing boss as a first unitary component wherein the bearing boss comprises ribs that extend radially outwardly from the bearing boss to increase heat transfer surface area;
casting a casing as a second unitary component;
machining male threads into the first unitary component;
machining female threads into the second unitary component; and
coupling the first unitary component to the second unitary component via the male threads and the female threads to define a cavity wherein the ribs of the bearing boss increase path length of lubricant flow in the cavity, wherein the bearing boss comprises a bore, wherein the casing comprises a bore coaxially aligned with the bore of the bearing boss and wherein a clearance exists between a turbine side surface of the bearing boss and an inner surface of the casing disposed about the bore of the casing to hinder transfer of heat energy to the bearing boss.
15. The assembly of claim 1 wherein the casing comprises ribs that extend into the cavity.
16. The assembly of claim 15 wherein the ribs of the casing increase path length of lubricant flow in the cavity.
17. The method of claim 14 wherein the casing comprises ribs that extend into the cavity.
18. The method of claim 17 wherein the ribs of the casing increase path length of lubricant flow in the cavity.