MAIN BEARING FOR CRANKSHAFT OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a main bearing for crankshaft of internal combustion engine which has a foreign matter discharging function while reducing the amount of oil leakage.SOLUTION: There is provided a main bearing 19 for crankshaft of internal combustion engine including a pair of semi-cylindrical bearings 17, 18. An oil groove 17a which is elongated in the circumferential direction and is arranged such that the middle of the width in the axial line direction is aligned with the center of an inlet opening 26 of a lubricant path 10a formed on a journal part 10 of the crank shaft is disposed on an inner peripheral surface 17S of one side semi-cylindrical bearing 17. The oil groove 17a is not elongated to a groove 24A in the axial line direction formed on the joint part of the pair of semi-cylindrical bearings 17, 18 and, therefore, a separation inner peripheral surface 17S' is elongated between the edge part 17E in the circumferential direction of the oil groove 17a and the edge surface 17A in the circumferential direction of the semi-cylindrical bearing 17. The length L1 in the circumferential direction of the separation inner peripheral surface 17S' is smaller than the length L2 in the circumferential direction of an inlet opening 26 and, therefore, the oil groove 17a can be communicated with the groove 24A in the axial line direction via the inlet opening 26.