Bearing device for internal combustion engines
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United States of America Patent
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-
May 3, 2005
Grant Date -
Mar 18, 2004
app pub date -
Jun 27, 2003
filing date -
Jun 27, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bearing device for internal combustion engines, comprising a crankshaft of an internal combustion engine and bearings supporting the crankshaft, and wherein the crankshaft is made of steel having not been subjected to surface hardening and having a structure, which is mainly composed of pearlite having the pro-eutectoid ferrite fraction of at most 3%, and is processed to have the surface roughness Rz of at most 0.8 μm, and wherein the bearings have an aluminum bearing alloy bonded to a back plate thereof and contain, as an alloy component thereof, at least Si particles of less than 4 mass %, whereby early abrasion and scratches of the crankshaft are suppressed to be equivalent to or less than abrasion loss and scratches of conventional DCI shafts.
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