Skeleton oil seal specification

       Structure and sealing principle of skeleton oil seal

       The skeleton oil seal is relatively simple and generally consists of three parts: an oil seal, a reinforcing skeleton and a self-tightening coil spring. The sealing body is further divided into a bottom portion, a waist portion, a cutting edge and a sealing lip according to different parts. Generally, the skeleton oil seal in the free state has a smaller inner diameter than the shaft diameter, that is, has a certain "interference". Therefore, after the oil is encapsulated in the oil seal seat and the shaft, the pressure of the oil seal edge and the contraction force of the self-tightening coil spring exert a certain radial tightening force on the shaft, and after a period of operation, the pressure will rapidly decrease or even disappear. Therefore, the spring can compensate the oil seal self-tightening force at any time.

       Sealing principle: This oil film has fluid lubrication properties due to the oil film controlled by the oil seal edge between the oil seal and the shaft. Under the action of the surface tension of the liquid, the stiffness of the oil film just forms a crescent surface at the contact end of the oil film and the air, preventing the leakage of the working medium, thereby achieving 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 leaks; if the thickness is too small, dry friction may occur, causing oil seal and shaft wear; if there is no oil film between the seal lip and the shaft, it is easy to cause heat and wear. .

       Therefore, when installing, it is necessary to apply some oil on the sealing ring, and at the same time ensure that the skeleton oil seal is perpendicular to the axis of the shaft. If it is not vertical, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive sealing lips. abrasion. During operation, the lubricant in the casing slightly exudes a little to achieve a state in which an oil film is formed at the sealing surface.https://www.supplyforever.com/

What is the oil seal

       Oil seal is a mechanical component used to seal oil (oil is the most common liquid substance in the transmission system, also refers to the general liquid substance). It isolates the parts of the transmission parts that need to be lubricated from the output parts, so as not to let the lubrication Oil leaks. Seals for static and dynamic seals (generally reciprocating) are called seals. The representative form of the oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring completely covered by rubber. Generally speaking, the oil seal often refers to this tc skeleton oil seal.

       What material is the oil seal?

       The oil seal is made of rubber. The oil seal is mainly used in the joint parts of two lubricating parts to prevent oil leakage, such as crankshaft oil seal, semi-shaft oil seal, transmission shell oil seal and the like.

       What is 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 of the transmission parts that need to be lubricated from the output parts, so as not to let the lubricating oil leak. The skeleton acts like a reinforcing bar inside the concrete member, which acts to strengthen and maintain the shape and tension of the oil seal.

       According to the structure, the single lip skeleton oil seal and the double lip skeleton oil seal can be divided. The secondary lip of the double-headed skeleton oil seal acts as a dustproof to prevent dust and impurities from entering the inside of the machine. According to the skeleton type, it can be divided into an inner skeleton oil seal, an exposed skeleton oil seal and an assembled oil seal. According to working conditions, it can be divided into rotating skeleton oil seal and reciprocating skeleton oil seal. Used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, etc.

       What is the general material of the skeleton oil seal?

       The general material of the skeleton oil seal is divided into: nitrile rubber (NBR), fluororubber (VITON), silica gel (SIL), nylon (PA), which are the most common materials, of course, PTFE Teflon oil seals, and Skeleton oil seals and more.

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