Piston copper bush structure with unloading lubrication function

The invention discloses a piston copper bush structure with an unloading lubrication function, and belongs to the technical field of engine structures. The unloading groove structure is arranged at the maximum load position of the piston copper bush, stress constraint of the piston copper bush can be reduced, then stress is released, the situation that the piston copper bush loses efficacy due to the fact that the load of the piston copper bush is too large is effectively avoided, and the service life of the piston is prolonged. The load of the piston copper bush can be reduced, the situation that an oil film cannot be formed in the contact area of the piston copper bush and the piston pin due to the extrusion effect is avoided, meanwhile, the unloading groove has the effect of an oil groove and is provided with an oil inlet and an oil outlet, and the oil inlet can increase the amount of lubricating oil splashing into the piston copper bush; the oil outlet can discharge lubricating oil to increase the flowability of the lubricating oil. The oil groove is connected with the unloading groove, the amount of lubricating oil entering the piston copper bush can be increased, the oil groove is provided with an oil storage groove structure, the amount of the lubricating oil between the piston copper bush and the piston pin cannot be splashed when the lubricating oil enters, and the lubricating effect is guaranteed.