INTERNAL-COMBUSTION ENGINE CONNECTING ROD HAVING HARD BASE AND SOFT STRUCTURE

摘要

An internal-combustion engine connecting rod having a hard base and a soft structure includes a connecting rod small end (1) and a connecting rod body (2), a connecting rod small end hole (3) being arranged in the connecting rod small end (1). The connecting rod small end has a hard base and soft structure, that is, the connecting rod small end uses a steel material or an alloy material having a tensile strength of sigmab>=700MPa as the hard-base material, and the connecting rod small end (1) has a flexible structure in which, under the action of cylindrical pressure through a piston pin (4), the elastic deformation Delta2 generated by the connecting rod small end hole (3) in the axial direction is adaptive to the bending deformation Delta1 generated by the piston pin (4) in the axial direction, said piston pin (4) being matched with the connecting rod small end hole (3). This allows the connecting rod small end hole to be well matched with the piston pin under all operating conditions, and the friction performance between the connecting rod small end hole and the piston pin is completely improved.