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How to Choose Skeleton Oil Seal?

Skeleton Oil Seal is suitable for many occasions, especially on engineering walking machinery, cranes, fire trucks and mining machinery vehicles with harsh working conditions. It has good sealing performance and mechanical characteristics, and is the main part of shaft sub-seal. Skeleton oil seal is mainly used as sealing material for automobile, sensor, medical, pharmaceutical, valve, pump, sanitation, bearing, electric appliance, rocket, etc. which requires vacuum resistance, friction resistance, high temperature resistance and chemical corrosion resistance.

Automotive Oil Seal

Automotive Oil Seal

Three forms of Skeleton Oil Seal:

1. Closed skeleton oil seal: This kind of Automotive Oil Seal is widely used, but it is inferior to exposed skeleton rotary shaft lip oil seal in terms of positioning accuracy, coaxiality and skeleton heat dissipation. There are two types of oil seal structure types: one is sub-lip type and the other is sub-lip type. It is a stamped metal skeleton wrapped in rubber to become an inner skeleton oil seal. Its manufacturing process is more complicated, but it has good rigidity, easy assembly, and does not require high material of steel plate.

2. Exposed skeleton oil seal: There are two types of structure type of this oil seal: split-flap type and split-flap type. The oil seal has accurate positioning, high coaxiality, easy installation and good heat dissipation of the skeleton. Rubber part and metal skeleton can be processed separately and then glued together to form exposed skeleton type. It is simple to manufacture and cheap. This structure is used in the United States and Japan.

3、Assembled skeleton oil seal: oil seal with or without sub-lip and sub-lip. This kind of oil seal is suitable for installation in the rotating shaft end in large and precision equipment. It seals liquids and grease at a pressure not exceeding 0.3 MPa. It assembles a rubber lip, a metal skeleton and a spring ring to form an oil seal. It has an internal and external skeleton to clamp the rubber lip. There is usually a baffle to prevent the spring from falling out.

Since the skeleton oil seal has an oil film between the oil seal and the shaft controlled by the edge of the seal, the oil film has fluid lubrication properties. Under the action of fluid surface tension, the oil film is stiffened just enough to form a crescent-shaped surface at the contact end of the oil film and air to prevent leakage of the working medium, thus achieving a seal on the rotating shaft. The sealing capacity of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the oil seal will leak; if the thickness is too small, dry friction will occur, causing wear of the oil seal and the shaft; if there is no oil film between the seal lip and the shaft, it will easily cause heat and wear.

The company also provides oil seals for Agricultural Machinery, please feel free to contact us if you need!