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Oil seal ring is one of the common types of oil seals, which can be divided into the following categories based on the structure and purpose of the oil seal ring:

Lip sealing ring: Lip sealing ring is a common oil seal ring composed of a metal shell, a flexible lip, and a spring that applies pressure to the lip on the shaft. Flexible lips are usually made of rubber or other elastic materials, aiming to form a tight seal on the shaft. Lip sealing rings are widely used, including automotive engines, pumps, and transmissions.

V-ring: V-ring is an oil seal ring used for high-speed shaft rotation and poses a risk of contamination. They are composed of a V-shaped rubber or other elastic material, installed on the shaft and tightly sealed with the casing.

Box sealing ring: Box sealing ring is a type of oil seal ring used in the presence of high pressure and high temperature. They are composed of a metal shell, sealing elements, and springs that apply pressure to the sealing elements. Sealing components are usually made of PTFE or other high-performance materials, aiming to form a tight seal on the shaft.

Mechanical seal ring: A mechanical seal ring is an oil seal ring used for high pressure, high temperature, and contamination risks. They consist of two mating surfaces pressed together by springs, typically made of ceramic, carbon, or other high-performance materials, designed to form a tight seal with the shaft.

Oil bath sealing ring: An oil bath sealing ring is an oil seal ring used for low-speed shaft rotation and poses a risk of contamination. They are composed of a metal shell, sealing elements, and springs that apply pressure to the sealing elements. Sealing elements are usually made of rubber or other elastic materials and are designed to form a tight seal on the shaft.

Please note that the above is only one of the common types of oil seal rings, and the specific classification may vary depending on the specific purpose, working environment, etc. In practical applications, it is recommended to choose a suitable type of oil seal ring based on the specific situation.