Sliding bearing having multilayer lead-free overplate and method of manufacture
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United States of America Patent
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Jul 31, 2001
Grant Date -
N/A
app pub date -
Nov 4, 1999
filing date -
Nov 4, 1999
priority date (Note) -
Expired
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Abstract
A multilayer engine bearing (10) includes a steel backing (12) having a liner (18) of bearing metal of either copper-lead or aluminum alloys formed on the backing (12) to define a base lining member (20) of the bearing (10). A multilayer overplate (22, 122) is formed on the base lining member (20,120) and includes multiple lead-free soft layers (24,124) separated by lead-free hard layers (26,126). The relative thicknesses of the overplate layers may be controlled to provide a macro hardness gradient across the thickness of the overplate (122) such that, for example, the overplate (122) may be softer near its top region (130) as compared to its bottom region (132).
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