Method of forming engine bearing
View Patent ↗A journal bearing has a lining of bearing metal applied to a steel backing. The surface of the lining is laser peen hardened to locally increase the hardness and the seizure resistance of the lining. The underlying core of the lining is unaffected and maintains good conformability of the lining. The overall lining thus possesses both good seizure resistance and conformability.
1. A method of manufacturing an engine bearing for an internal combustion engine, comprising:
forming an arcuate metal backing plate;
forming a lining of bearing metal different than that of the backing plate on the backing plate defining an inner arcuate surface;
imparting compressive residual stresses within a layer of the lining extending from the inner arcuate surface toward the arcuate metal backing plate; and
constructing a hardened surface layer and a core within the lining upon imparting compressive residual stresses within the lining, wherein the hardened surface layer is constructed having a hardness about 5 points greater on a Vickers scale than the core of the lining.
2. The method of manufacturing an engine bearing of claim 1 further providing a laser peening operation for imparting the compressive residual stresses within the lining.
3. The method of manufacturing an engine bearing of claim 1 wherein the core is constructed having a hardness less than both the arcuate metal backing plate and the hardened surface layer.
4. The method of manufacturing an engine bearing of claim 1 further comprising constructing a textured surface on the inner arcuate surface.
5. The method of manufacturing an engine bearing of claim 4 wherein the textured surface is constructed as circumferential grooves.
6. The method of manufacturing an engine bearing of claim 1 wherein steel is provided in forming the arcuate metal backing plate.
7. The method of manufacturing an engine bearing of claim 1 wherein an aluminum-based material is provided in forming the lining.
8. A method of manufacturing an engine bearing for an internal combustion engine, comprising:
forming an arcuate metal backing plate;
forming a lining of bearing metal different than that of the backing plate on the backing plate defining an inner arcuate surface;
imparting compressive residual stresses within a layer of the lining extending from the inner arcuate surface toward the arcuate metal backing plate;
constructing a hardened surface layer and a core within the lining upon imparting compressive residual stresses within the lining, wherein the hardened surface layer is constructed extending about 20 to 50 micrometers below the inner arcuate surface.
9. The method of manufacturing an engine bearing of claim 8 further providing a laser peening operation for imparting the compressive residual stresses within the lining.
10. The method of manufacturing an engine bearing of claim 8 wherein the core is constructed having a hardness less than both the arcuate metal backing plate and the hardened surface layer.
11. The method of manufacturing an engine bearing of claim 8 further comprising constructing a textured surface on the inner arcuate surface.
12. The method of manufacturing an engine bearing of claim 11 wherein the textured surface is constructed as circumferential grooves.
13. The method of manufacturing an engine bearing of claim 8 wherein steel is provided in forming the arcuate metal backing plate.
14. The method of manufacturing an engine bearing of claim 8 wherein an aluminum-based material is provided in forming the lining.