The piston slides at high speed along the cylinder wall under the action of lateral pressure. Due to poor lubrication conditions, friction loss is large and wear is severe.

Generally speaking, about 40% of the friction loss on Mitsubishi Engine comes from the friction between the piston, piston ring and cylinder wall, not the car.

The function of the connecting rod group is to transmit the force borne by the piston to the crankshaft, converting the reciprocating motion of the piston into the rotational motion of the crankshaft.

The connecting rod group is subjected to alternating loads of compression, tension and bending during operation, so the connecting rod body may bend and twist. The connecting rod body and connecting rod cap are made of high-quality medium carbon steel or medium carbon alloy steel die forging or roll forging.

The crank-connecting rod mechanism consists of a piston connecting rod group, a body group and a crankshaft flywheel group. It is a transmission mechanism for an internal combustion engine to realize the working cycle and complete energy conversion.

It is an energy conversion mechanism for Bare Engine, through which the heat energy generated after fuel combustion is converted into mechanical energy.

Its working conditions are quite harsh, and it should withstand high temperature, high pressure, high speed and chemical corrosion, and withstand large air pressure and mass inertia of moving parts. Therefore, the material and structural requirements of the crank-connecting rod mechanism are quite high, and its structure directly determines the performance and efficiency of Bare Engine.