In designing oil seals what is important is the type of rubber used as material oil seals must be oil resistance properties well under working condition. Important information for user-defined testing properties of materials used to make oil seals are as follows.
1. Type of oil such as lubricant , hydrolic oil.
2. Temperatue of oil at working condition
3. Pressure of oil at working condition
4. Shaft Speed (In the case of the rotating shaft)
The standard test used to test the resistance of the oil is ASTM D471 Standard Test Method of Rubber Property-Effect of Liquids. This test method only those failures caused to determine the likehood that an oil might cause premature sealing system failures in field use.
Measure
1. volume swell (% Volume Change)
2. excessive rubber hadening
3. elongation loss
4. Stress Relaxation
Testing of the material properties of the oil seals of NOK Oil seal material found that Viton® or Fluorocarbon (FKM) is the rubber has heat resistance. It also has excellent resistance to oil and chemical. It is the best rubber for oil seals due to its well-balanced charecteristics. However, this material is not resistant types of brake fluid (DOT 3 , DOT5 glycol base) refrigerants (R32 and R134a) Anti freeze Solution ans water stream.
Monday, May 2, 2016
Thursday, April 7, 2016
Oil Seal : An introduction
Oil seal is a component of the machinery that is used to seal lubricants or seal . Lubricants are used in the part of the machine that contact to ensure that they are moving evenly and last longer. Oil seals are used to prevent fluid from leaking through "The gap of bearings" of the machine. With the advancement of engineering thus not only necessary to prevent the leakage of the lubricant but to prevent the water chemicals or dust into the machine. Oil seal is used to serve both these respects. O-rings have a mechanism of action similar to the oil seals. Oil seal is used mainly in applications with rotating shaft.
Structural components of the oil seals consist of three parts.
1 Elastomeric Sealing Matterial (rubber seal)
2. Metal Case (sealing frame).
3. Gartor Spring (Spring Press).
The materials used to produce the rubber seal. The materials used to manufacture rubber seals used in the manufacture oil seals are many different types but the most widely used in mechanical parts common to have a few species. The species that need very special will be produced and used locally, but the price will be higher as well. Popular materials are summarized as follows.
1. Nitrile (NBR)
Nitrile rubber is a common group of acrylonitrile terpolymer Butadiene by arylonitrile nitrile compound is a major component (18% to 50%), affecting the physical properties of the material. Impact resistance and heat the oil in a temperature range of -40 ° C to 120 ° C (oil) or 90 ° C (water) while also having the flexibility and resistance to compression force. Nitrile rubber has better mechanical properties compared to other types of rubber and a high wear resistance. It is commonly used in the oil seals.
2. EPDM (Ethylene Propylene)
EPDM is polyethylene (ethylene) and polypropylene (propylene), which Ehylenepropylene diene- (EPDM) are produced using monomers III and is particularly useful for sealants in hydraulic fluids. Spring Cleaning The broad operating temperature range -65 ° F to 300 ° F (-55 ° C to 150 ° C) In addition, the use of steam and temperatures below the normal temperature applications as well.
3. Viton® or Fluorocarbon (FKM)
Viton® (fluorocarbon rubber) has many great features that have been developed to produce a rubber seal. The property unprotected in high temperature in every condition, air, fuel, hydraulic devices, fuels, solvents, or chemical solvents are some tons of material that is chosen. rubber Seal (Seal rubber) Viton® is capable of a temperature range of -15 ° F to 450 ° F (-26 ° C to 232 ° C).
Structural components of the oil seals consist of three parts.
1 Elastomeric Sealing Matterial (rubber seal)
2. Metal Case (sealing frame).
3. Gartor Spring (Spring Press).
The materials used to produce the rubber seal. The materials used to manufacture rubber seals used in the manufacture oil seals are many different types but the most widely used in mechanical parts common to have a few species. The species that need very special will be produced and used locally, but the price will be higher as well. Popular materials are summarized as follows.
1. Nitrile (NBR)
Nitrile rubber is a common group of acrylonitrile terpolymer Butadiene by arylonitrile nitrile compound is a major component (18% to 50%), affecting the physical properties of the material. Impact resistance and heat the oil in a temperature range of -40 ° C to 120 ° C (oil) or 90 ° C (water) while also having the flexibility and resistance to compression force. Nitrile rubber has better mechanical properties compared to other types of rubber and a high wear resistance. It is commonly used in the oil seals.
2. EPDM (Ethylene Propylene)
EPDM is polyethylene (ethylene) and polypropylene (propylene), which Ehylenepropylene diene- (EPDM) are produced using monomers III and is particularly useful for sealants in hydraulic fluids. Spring Cleaning The broad operating temperature range -65 ° F to 300 ° F (-55 ° C to 150 ° C) In addition, the use of steam and temperatures below the normal temperature applications as well.
3. Viton® or Fluorocarbon (FKM)
Viton® (fluorocarbon rubber) has many great features that have been developed to produce a rubber seal. The property unprotected in high temperature in every condition, air, fuel, hydraulic devices, fuels, solvents, or chemical solvents are some tons of material that is chosen. rubber Seal (Seal rubber) Viton® is capable of a temperature range of -15 ° F to 450 ° F (-26 ° C to 232 ° C).
Viton Oil Seals for Motor Hydrolic and gear box
Viton Oil Seals for Motor Hydrolic and Gear box
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