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Oil Seals

Oil Seals :

Oil seals go by many names, such as shaft seals, dirt seals, grease seals, lip seals, and many other variations of these. They are essentially simple devices used in rotary shaft equipment to prevent lubricant from escaping and for excluding contaminants such as dust, dirt and water. An oil seal’s most important function, however, is that it protects every type of ball, sleeve and roller bearing in the rotating shafts. The seals also prevent the integration of two different fluids that shouldn’t mix, such as oil and water.

Oil Seals serve the following functions

  • Prevent leakage of sealed lubricant from inside
  • Prevent entry of dust and foreign matter (dirt, water, metal powder, etc.) from outside

Oil Seal Components:

Oil seals normally consist of three basic components: the sealing element, the metal case, and garter spring.

For all general applications, Oil Seals can be in variety of designs like

  • Based on Outer Case: Rubber or Metallic Outer case
  • Based on Sealing Lip: Single Lip or Double Lip
  • Based on : Sealing Element Rubber Type

Materials Used for The Oil Seal

Nitrile Rubber (NBR) – this is the most commonly used material. It has good heat resistance properties and has good resistance to salt solutions, oils, hydraulic oils, and gasoline. Operating temperatures are recommended from -40 to 248⁰ F (-40 to 120 deg.C). Nitrile also functions well in a dry environment, but only for intermittent periods. The disadvantage of this material is poor chemical resistance.

Silicone Rubber (SI) – these compounds operate effectively in a broad temperature range of -58⁰ F to 356⁰ F (-50 to 180⁰ C). Silicone rubber is a leading choice for its resistance to both low temperatures and heat. The high lubricant absorbency of the material minimizes friction and wear. These oil seals are usually used as crankshaft seals. Silicone has poor resistance to hydrolysis and should not be used in oxidized or hypoid oils.

Polyacrylate Rubber (PA)– also known as acrylic rubber, this material has better heat resistance than nitrile. PA is also recommended for a high surface speed environment. Operation temperatures are recommended from -4 to 302⁰ F (-20 to 150⁰ C). Polyacrylate rubber should not be used with water or in temperature below -4⁰ F (20⁰ C).

Fluorocarbon Rubber (FKM) – is widely known under the Chemours (formerly Dupont™) trade name of Viton® and offers the best resistance to chemicals and superior performance to high temperatures.

Factors in Oil Seal Selection:

Below information must be considered while selection an Oil Seal.

  • Type: Combination of lip design and case type.
  • Shaft Diameter: The outside diameter of the shaft where the seal will operate (sometimes referred to as the I.D. of the oil seal)
  • Bore Diameter: The inside diameter of the bore housing where the seal will operate (sometimes referred to as the O.D. of the oil seal)
  • Width (or Depth): The depth of the bore (also known as the width or height of the seal). Note: When the width of the seal is not strictly specified, the depth of the bore is usually made big enough so a seal might be replaced by a wider one.
  • Sealing Lip material
  • Any special materials or considerations, such as stainless steel for the case and/or spring
  • Any special treatment or finish such as painted, polished edge, etc.

How we at 3S Engineering Solutions can help?

We work very closely with our customers & help them in arresting oil leakages by offering right Oil Seal profile & suitable material.
We offer both Imported & Made-In-India Oil Seals.