Main bearing structure and engine

The utility model discloses a main bearing structure and an engine, the main bearing structure comprises a bearing cap, a bearing bush and two elastic buffer components, the bearing cap is provided with an arc-shaped hole, the bearing bush is arc-shaped and is located in the arc-shaped hole, the middle part of the bearing bush along the axial direction is in interference fit with the bearing cap, and the two elastic buffer components are both arranged between the bearing cap and the bearing bush. And two ends of the bearing bush along the axial direction are respectively positioned. According to the main bearing structure, the elastic buffer assembly is arranged in the gap formed by the bearing bush and the bearing cover, and the elastic buffer assembly buffers the acting force applied to the bearing bush through the crankshaft, so that the contact stress between the two axial ends of the bearing bush and the crankshaft is effectively reduced, and the phenomenon of fatigue wear of the surface of the bearing b