Bearing device for crankshaft

A bearing device for a crankshaft, which supports the crankshaft having one end to which a transmission is connected,

• the bearing device comprising:
• a bearing support portion that has a bearing hole penetrating between two side surfaces on opposite sides of the bearing support portion, and supports a journal of the crankshaft by the bearing hole;
• a first thrust bearing that is disposed on a first side surface of the bearing support portion facing a side of the transmission out of the two side surfaces, the first thrust bearing including a first bearing surface in a half-split ring shape, and a plurality of oil grooves formed to cross the first bearing surface from an inner circumferential side to an outer circumferential side, and the first bearing surface receiving a force in an axial direction of the crankshaft by being disposed at a circumferential edge of the bearing hole in the first side surface;
• and
• a second thrust bearing that is disposed on a second side surface of the bearing support portion facing an opposite side from the transmission out of the two side surfaces, the second thrust bearing including a second bearing surface in a half-split ring shape, and a plurality of oil grooves formed to cross the second bearing surface from an inner circumferential side to an outer circumferential side, and the second bearing surface receiving a force in an axial direction of the crankshaft by being disposed at a circumferential edge of the bearing hole in the second side surface;
• in the first thrust bearing, the first bearing surface between the plurality of oil grooves is configured by including a taper surface formed so that a wall thickness of the first thrust bearing becomes thicker toward a rotation direction of the crankshaft, and
• in the second thrust bearing, the second bearing surface between the plurality of oil grooves is configured in a plane such that the second thrust bearing has a constant wall thickness in a region between the plurality of oil grooves.