| 摘要 |
PROBLEM TO BE SOLVED: To increase the oil film thickness in an axial direction of a bearing surface and to prevent the occurrence of early wear and seizure by a method wherein the end part in an axial direction of a bearing surface is formed in a taper-form state that a diameter is increased toward an end and an oil reservoir part is formed in the taper-form part. SOLUTION: A main bearing serving as a plurality of slide bearings to support the crank shaft of an engine is formed in a cylindrical state by butting upper and lower half-division bearings against each other. The upper and lower half-division bearings are formed such that a bearing alloy 5 is mounted on the inner peripheral surface of a back metal 4 made of copper and an overlay layer 6 is formed on a bearing alloy 5 through plating. In this case, the two end parts in an axial direction of the main bearing are formed in a taper-form state that a diameter is gradually increased toward an end. A plurality of peripherally extending grooves 11 are formed as an oil reservoir part in this taper-form part 10. The groove 11 is formed such that after a groove 12 is formed in the surface of the bearing alloy 5 through a machining work, an overlay layer 6 is formed through plating. This constitution ensures a gap between the bearing surface of a main bearing and the main shaft 13 of a crank shaft and holds lubrication oil in the gap. |
