| 摘要 |
The object of the present invention is to reduce the amount of lubricant oil leaking from supporting areas of main journal portions without increasing friction of bearing members against the main journal portions. The oil-feeding device for a crankshaft of the present invention includes upper bearing members (20A, 20B, 20b, 20E) and lower bearing members (22A, 22B, 22D, 22E). The upper and lower bearing members have a half hollow cylindrical shape, are provided with crush relief portions (28) at both ends, and jointly encompass main journal portions (14A, 14B, 14D, 14E) of a crank shaft (10). The upper bearing members have circumferentially extending oil grooves (30) provided in the faces opposite the main journal portions, the grooves penetrating through oil passages (36, 36A, 36B, 36D, 36E) of a cylinder block (12). The lower bearing members do not have oil grooves. The oil grooves (30) do not extend in the crush relief portions (28), and therefore the leakage of lubricant oil, fed to the oil grooves (30), to the areas of the crush relief portions (28) is suppressed. <IMAGE> |
