The oil seal is made of rubber (lip and joint) · spring · metal skeleton.
Oil seal (English name: oil seal) is used to seal the oil (oil is the most common lubrication medium transmission system) mechanical components, Oil Seals it will need to lubricate the parts and components of the transmission parts, and will not let the oil leakage The Sealing from the oil seal, features, structure type, working conditions and sealing mechanism can be divided into various forms and different names, but the habit of the general rotation of the shaft lip seal called oil seal.
The representative form of the oil seal is the TC oil seal, which is a rubber completely covered with self-tight spring lips oil seal, the oil seal is generally referred to as the TC skeleton oil seal.
Oil commonly used materials are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene and so on. When selecting the oil seal material, the compatibility of the material with respect to the working medium, the adaptability to the working temperature range, and the ability of the lip to rotate at high speed with respect to the rotary axis must be taken into account. General oil seal work when the lip temperature is higher than the working medium temperature 20 ~ 50 ℃, in the choice of oil seal material should be noted. The working range of the oil seal is related to the material used for the oil seal, for example, NBR is -40 to 120 ° C and the fluoro rubber (FPM) is -25 to 300 ° C.
Seal cold resistance
The cold resistance of the oil seal is determined by the characteristics of the lip material, the characteristics of the sealing medium, the eccentricity of the shaft, Oil Seals the speed at the time of starting, and so on.
Usually the amount of eccentricity of the shaft, due to the amount of oil seal lip to reach the number of% limit, NOK used in the low temperature field, the inner lip material TR10 value as the reference temperature of the reference. In the actual use state, for example, it is also lower than the TR10 value of the temperature conditions, after the start sliding heat, lips temperature rise, rubber elastic recovery, to maintain the situation of sealing. On the other hand there is a higher temperature than the TR10 temperature conditions, the shaft eccentricity larger, Oil Seals lip can not follow the case of leakage. It is dangerous to determine the permissible temperature of the oil seal only with the TR10 value, and it is necessary to consider the above important factors.
The use of oil seal is quite extensive, with the engine as an example, some of the oil seal.
Hydraulic pump oil seal; oil seal; oil pump oil seal; camshaft oil seal; before and after the transmission seal; shift lever oil seal; before and after the transfer device seal; after the bridge half Shaft oil seal; differential (front) after the angle of the oil seal; wheel oil seal; direction of the oil seal; direction booster oil seal.
In short, all the operation of the body tank with liquid lubricants and connected with the external parts of the need for oil seal. Some are rubber, Oil Seals some are metal, mostly steel rubber, such as crankshaft oil seal, gearbox before and after the oil seal, left and right axle oil seal, the main reducer before the oil seal, air compressor crankshaft oil seal and other oil seal installation