It can be understood that the connecting rod shoe is a gasket in the middle of the joint between crankshaft and connecting rod. It is like a bearing, because this joint bears the impact force. If bearings are used, they will be easily damaged by impact force, so gaskets are used instead of bearings. The material of this gasket is different from that of connecting rod crankshaft, which is intended to reduce the impact wear of two hard-wired connecting rod crankshafts.