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Home - News - The difference between the rotary shaft lip seal and the skeleton oil seal and the three forms of the skeleton oil seal!

The difference between the rotary shaft lip seal and the skeleton oil seal and the three forms of the skeleton oil seal!

October 24, 2022


  The bearing exhibition tells you that although the names of the rotary shaft lip seal and the skeleton oil seal are different, the products are one kind. However, this rotating shaft lip seal is a product of the skeleton oil seal. The skeleton oil seal is a typical representative of the oil seal. Generally speaking, the oil seal refers to the skeleton oil seal. The function of the oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as to prevent the leakage of lubricating oil. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension.


   The skeleton oil seal is suitable for use in many occasions, especially in construction machinery, cranes, fire trucks and mining machinery vehicles. It has good sealing performance and mechanical properties under harsh working conditions, and is the main component of the auxiliary shaft seal. Skeleton oil seals are mainly used for sealing materials such as automobiles, sensors, medical treatment, pharmaceuticals, valves, pumps, sanitary ware, bearings, electrical appliances, rockets, etc. that require vacuum resistance, friction resistance, high temperature resistance, and chemical corrosion resistance.


   There are many classification methods of skeleton oil seals, which can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals according to the structure. According to working conditions, it can be divided into rotary skeleton oil seal and reciprocating skeleton oil seal. According to the skeleton type, it can be divided into inner skeleton oil seal, exposed skeleton oil seal and assembled oil seal.


Inner skeleton oil seal


The oil seal is widely used, but it is not good in positioning accuracy, coaxiality, and heat dissipation of the skeleton.


Such as exposed skeleton rotating shaft lip seal. The oil seal has two types of structure: without auxiliary lip (type B) and with auxiliary lip (type FB). It is to wrap the stamped metal skeleton in rubber to become the inner skeleton oil seal. Its manufacturing process is more complicated, but it has good rigidity, is easy to assemble, and does not require high steel plate materials.


Exposed Skeleton Oil Seal


There are two types of oil seal structure: with or without auxiliary lip (W type) and with auxiliary lip (FW type).


The oil seal has accurate positioning, high coaxiality, convenient installation and good heat dissipation of the skeleton. The rubber part and the metal frame can be processed and manufactured separately, and then glued together to form an exposed frame type. Simple to manufacture and cheap.


Assembled skeleton oil seal


Oil seals are available with or without auxiliary lip (Z type) and with auxiliary lip (FZ type).


This oil seal is suitable for rotating shaft ends installed in large, precision equipment. Under the condition that the pressure difference does not exceed 0.3MPa, it can seal the fluid and grease. It assembles the rubber lip, the metal skeleton and the spring ring to form an oil seal. It has an inner and outer frame to clamp the rubber lip. There is usually a stopper to keep the spring from dislodging.


Because the skeleton oil seal has an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics. Under the action of the surface tension of the liquid, the rigidity of the oil film just makes the oil film and the air contact end form a meniscus, which prevents the leakage of the working medium and thus realizes the sealing of the rotating shaft. The sealing ability 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 may occur, causing the oil seal and shaft to wear; if there is no oil film between the sealing lip and the shaft, it is easy to cause heat and wear. .