Is there a heat resistant cylinder? Can it withstand 100 degrees?

1. Cylinder wear and failure phenomenon.

There is a noticeable clicking knocking sound during the cold start, and the temperature increases, and the sound is weakened or disappears.

The cylinder pressure is low. Sometimes blue smoke is emitted from the exhaust pipe, and blue smoke is emitted from the oil port.

Reduced engine dynamics.

Increased fuel consumption. Fault diagnosis and elimination of cylinder wear.

Second, the wear law of the cylinder and its causes.

1) Cylinder wear law.

From the longitudinal section of the cylinder (along the axis of the cylinder): irregular "cone" or "cone" with large upper and lower size. Wear the most areas:

When the piston is located at the top dead center, the cylinder wall corresponding to the first piston ring, the upper mouth that the piston ring cannot touch is not worn, forming a "cylinder step". In special cases, the greatest wear of the cylinder is in the middle (waist drum shape). On the same engine, the wear of different cylinders is not the same, and the wear of the front wall of the first cylinder and the rear wall of the last cylinder of the water-cooled engine is more serious.

From the cylinder cross-section: uneven wear, worn into an irregular oval. The maximum wear part of each cylinder along the circumferential direction: generally the most wear of the cylinder wall near the opposite side of the intake valve.

2) Causes of cylinder wear.

Under normal conditions, the wear of the cylinder along the working surface in the piston ring movement area is an irregular cone with a large top and a small bottom along the height direction. The largest part of wear is the cylinder wall corresponding to the first piston ring when the piston is in the top dead center position. However, the upper mouth of the piston ring, which is not in contact with the cylinder wall, is almost not worn, resulting in a noticeable cylinder shoulder.

The reasons why the top is big and the bottom is small:

Mechanical wear: When the piston is located at the top dead center, the high-temperature gas burst pressure is the largest, resulting in the positive pressure of the piston ring on the cylinder wall increases, the friction also increases, the lubricating oil film is destroyed, and the cylinder wall wear corresponding to the first piston ring is the most serious.

Corrosion wear: organic acids and acidic oxides (dissolved in water to form mineral acids) from the combustion of gas mixtures. It has a corrosive effect on the surface of the cylinder, resulting in corrosion and wear. The upper part of the cylinder block cannot be completely covered by the lubricating oil film, and the corrosion effect is more serious.

Abrasive wear: Dust in the air, mechanical impurities in the lubricating oil, and abrasive debris in the engine enter the cylinder walls to cause abrasive wear. The dust in the air is sucked into the upper part of the cylinder, which has sharp edges and corners, so the upper part of the cylinder is also the most worn.

The reason for the waist drum shape: in areas with severe wind and sand, after a large amount of dust enters the cylinder, the abrasive wear is the most serious due to the maximum movement speed of the piston in the middle of the cylinder.

3. Cylinder wear fault diagnosis method.

Detection of faulty cylinder pressure.

Inspect cylinder diameter and cylindricity.

Generally, the cylinder is resistant to 60-70°, and the cylinder needs to be resistant to 100°, and it needs to be equipped with high-temperature sealing ring and high-temperature lubricating oil.

Nitrile rubber: wear-resistant, heat-resistant, wear-resistant, corrosion-resistant, applicable temperature: -30-100, widely used in dynamic sealing and static sealing of hydraulic and pneumatic systems.

Fluoroelastomer: high temperature resistance, oil resistance, vacuum resistance, and various chemical resistance; Low temperature characteristics are poor, compression set is large, and the highest is high, the mechanical strength is low, and the manufacturability is poor. Applicable temperature: -30 -200, suitable for sealing of high temperature and special media.

High temperature resistant lubricating oil, maintain the solid state of lubricating oil in high temperature environment, reduce friction, and prolong the operating life of the cylinder.