Definition and structure of shaft oil seal and hole oil seal
Shaft oil seal is a kind of mechanical seal, usually composed of metal shell, spring and rubber sealing ring. Its main function is to prevent axial leakage of lubricating oil, shock absorption and sealing of the machine. During installation, the spring end of the oil seal should face the direction of the shaft center to ensure that the seal tightly fits the shaft surface and prevents oil leakage.
The hole oil seal is also a mechanical seal, usually composed of a metal shell, a rubber sealing ring and a support ring. Its main function is to prevent hydraulic oil or lubricating oil from leaking from holes in the working parts of the machine that are difficult to prevent. Its installation requirements are similar to those of shaft oil seals, but attention must be paid to the installation location and hole size.
Distinction
1. Different scope of application
Hole oil seals are mostly used on hollow parts such as stop holes to block their cavities and prevent lubricating oil or oil stains from leaking out. They can also block contaminants from entering the interior. Shaft oil seals are mostly used to be fixed on the shafts of mechanical equipment such as shaft winches, reducers, gearboxes, water pumps, clutches, etc. They are used to prevent lubricating oil, grease or other unwelcome substances from entering the interior of the equipment and protect the normal operation of the equipment.
2. Different structural forms
The hole oil seal is generally circular in shape with uniform thickness, and its inner part must be made of elastic material to fit on the acrylic plate. The shaft oil seal is in the shape of a semi-circular ring, and the material surface requirements are relatively high. It can be placed in the inner spokes, or installed directly on the end face of the lower bearing.
3. Different uses
The oil seal for the hole is to prevent the entry and exit of some liquids, gases and other substances in the hollow parts, as well as garbage and other impurities, such as automobile engine garbage, gasoline, the inside of the cylinder, etc. The oil seal for the shaft is mainly to prevent liquid, grease, dust on the shaft , water and other impurities enter the inside of the machine to prevent the inside of the machine from being polluted and maintain the service life of the machine.
Working Principle
1. Oil seals for holes mainly use pressure to form a sealed space between the sealing lip and the hole wall, thereby preventing the leakage of liquid or gas. When the equipment rotates, the spring, sealing lip and support ring of the hole oil seal will rotate and stick to the hole wall, bearing the axial load. At the same time, it also uses the temperature and pressure generated by the friction of the sealing lip to form a closed environment with the lubricating oil film between its own lip and the hole wall, thereby achieving the sealing effect.
2. The sealing principle of the shaft oil seal is relatively simple compared to the hole oil seal. Through the direct contact between the lip of the oil seal and the shaft, a lubricating oil film of a certain thickness is formed on the surface of the shaft, thereby preventing contaminants such as dust and liquid from entering the bearing and ensuring the normal operation of the bearing.
Common Points
Hole oil seals and shaft oil seals are commonly used sealing devices in industrial production. Their functions are to prevent leakage and contamination of lubricating oil, hydraulic oil or other working media inside mechanical equipment. Both are composed of elastic materials and metal materials, the sealing effect is produced by elastic materials, and both have relatively high wear resistance and corrosion resistance.
Summarize
Shaft oil seals and hole oil seals are both mechanical seals and are important sealing devices in industrial production. Shaft oil seals are mainly used to prevent axial leakage of lubricating oil, shock absorption and sealing of the machine, while hole oil seals are mainly used to prevent hydraulic oil or lubricating oil from leaking from holes in the working parts of the machine that are difficult to prevent. Generally speaking, there are some differences in the functions and applications of bore oil seals and shaft oil seals. When selecting and using, judgment must be made based on the specific situation to achieve good sealing effect and normal operation of mechanical equipment.
