What Are The Unknown Secrets Of Motorcycle Piston Rings?

In fact, there are not many secrets about the piston ring, because this part is not unfamiliar to car lovers. It mainly plays a sealing role. With this part as a foil, the piston movement of the engine will have practical significance. One point I believe most riders are aware of.

But the lack of secrets does not mean that it has no secrets. As the main part of the engine, the piston ring still has some little secrets that are unknown to the public, so the question of the subject is very meaningful. would help.

1. Brief classification, the current four-stroke engine piston rings are mainly divided into gas rings and oil rings. Usually, the gas ring is a one-piece ring, while the oil ring is a combined ring. Of course, there are also one-piece combined oil rings, but this kind of piston The application of rings on motorcycles is not very wide.

2. Main function, although the piston ring mainly plays the role of sealing, the actual role will be different due to different classifications. The gas ring mainly plays the role of sealing, and the oil ring mainly plays the role of scraping oil.

3. Installation method, because the classification and main function of the piston ring are different, the secret of the piston ring will be involved in the actual installation. First of all, when installing the piston ring, the oil ring must be installed first, and then the air ring. Secondly, in addition to staggering each ring by 120 degrees, the air ring is also divided into front and back and upper and lower rings. Of course, this is not a secret. The real secret will be shown below.

Why is there a difference between a gas ring and an oil ring?

For a four-stroke engine, its cylinder wall lubrication is an independent lubrication system, which means that oil is not allowed to enter the combustion chamber. Under such design standards, the existence of the oil ring is very important, because only this part can Hang the excess oil on the cylinder wall back into the engine sump.

Why are the piston rings staggered?

The staggered position of the piston ring is mainly to avoid the phenomenon of air leakage and oil leakage after the heavy mouth. For a four-stroke engine, the working process of the piston ring will be in a slow rotation state. The openings are staggered so that in the later use, the failure of the power drop to burn the oil will occur because of the piston ring counterpart.

Why is there a distinction between one and two rings?

The working temperature in the cylinder of the internal combustion engine is relatively high, but because of the difference in lubrication, the contact with the working surface is different, so the requirements for the wear resistance and deformation coefficient of the first ring will be relatively high. There will be a distinction between two rings.

In addition to the different materials and surface spraying of the first and second rings, their opening sizes are also different. As long as the opening distance of the first ring of the regular product is larger than that of the second ring, this is mainly for the piston. A gap reserved for thermal expansion and contraction of the ring.

As for the front and back of the piston gas ring, it mainly depends on the form of the fracture of the piston ring, because the fracture form of the piston ring of different models is different, and for motorcycles, it is basically a flat fracture, so just pay attention to the installation. The mark on it will do just fine.

The above are some of the little-known and unknown secrets of piston rings. In a brief summary, they are classification, use and usage.