Oil Seals

Oil Seal Basics :-

In an oil seal environment there is a shaft that is rotating inside a housing or bore. Because of friction, there must be some clearance between the shaft and the bore. The function of the oil seal is to stop whatever fluid is inside from leaking out the clearance between the shaft and housing. The oil seal may also be used to prevent outside materials, such as dirt, from moving in through the clearance.

"Dynamic sealing" is the relationship between the rotating shaft and the seal and is handled by the sealing element. A garter spring may used in the oil seal to increase the radial interference between the  oil seal lip and contact point on the shaft. In order to achieve this interference, the oil seal's ID must be slightly smaller than the diameter of the shaft.

"Static sealing" is the relationship between the housing and the seal. In order to achieve this interference, the oil seal's OD must be slightly larger than the diameter of the housing or bore.

An oil seal normally consists of three basic components: the sealing element, the metal case and the spring. The purpose of the sealing element is to stop the fluid from leaking between the shaft and housing. The metal case will give rigidity and strength to the seal while it is being held in the bore or recessed groove. The spring will help make the sealing element more effective. All materials must be selected depending on the environment in which the oil seal will function.

Oil Seal Types :

OIL SEAL O.D Design: 

• Oil seal with Economical metal O.D design for standard application (B2).
• Oil Seal with Metal O.D with rubber covering on fluid side for added protection (B).
• Oil Seal with Metal O.D design with rubber nose for enhanced O.D sealing (BR).
• Oil Seal with Rubber covered O.D design for excellent O.D sealing (C).
• Oil Seal with Metal O.D design with an inner case for greater structural rigidity (A2).  

OIL SEAL LIP Design : 

• "S" Type Lip :Oil Seal with this type Lip are meant for non pressure fluid sealing & severe grease  sealing applications.   
• "T" Type Lip :Oil seal with this type Lip are meant for non pressure fluid sealing & severe grease sealing with light duty  exclusions of contaminants.
• "V" Type Lip :Oil seal with this type Lip are meant for economical grease or viscous fluid retention.
• "K" Type Lip :Oil Seal with this type Lip are meant for economical grease or viscous fluid retention with light duty  exclusions of contaminants. 
• "WP" Type Lip :Oil seal with this type lip are meant for dirt wiping or scrapping in hydraulic cylinder applications.