| 摘要 |
PROBLEM TO BE SOLVED: To increase the connecting strength between a plurality of members in a crankshaft bearing having the members of different materials by forming a support structure with a porous material, and allowing the material of a holding portion to flow into the holes of the support structure. SOLUTION: A support structure 1a is made of a porous material mainly constituted of high silicone aluminum, and a holding portion 2a is made of a material suitable for a bearing cap, e.g. cast iron, aluminum or magnesium. The material of the holding portion 2a is impregnated, i.e., flows, into the holes of the porous material of the support structure 1a in the boundary between the holding portion 2a and the support structure 1a, thereby the connecting strength between the holding portion 2a and the support structure 1a is very high. The porous material mainly constituted of high silicone aluminum has a specific gravity smaller than that of the material constituting the holding portion 2a and is lightweight, and a lightweight crankshaft bearing is obtained.
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