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  •  
    Rotary Shaft Seal
    Oil Seal

    The Rotary Shaft Seal also known as an oil seal, shaft seal, lip seal, is a simple device for excluding dust, dirt, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. Generally it has been developed as a means of protecting the bearings of rotating shafts.
    The Flexible Lip is held against the rotating part (usually the shaft) whilst the casing (or O.D) is pressed into the housing bore and holds the seal in place.

    Oil seals prevent internal system fluids from leaking and keep external contaminants from entering the system. Leakage and/ or contaminants paths occur between the shaft and the seal lip (ID) and between the seal and the housing (OD). Oil seals should seal both dynamically (ID) and statically (OD).

    Dynamic sealing is the relationship between the shaft and the sealing element. The sealing element or lip may include a garter spring, which increases the radial interference between the seal lip and the shaft.

    Static sealing is the relationship between the stationary housing and the seal OD. It is the interference (press fit) between the larger OD of the seal, and the bore which results in the static seal. Using an elastomeric OD over a metal OD will improve the static sealability.

    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.

    Materials which are available?
    Leather is the oldest of the lip materials still in use with an increase in Synthetic Rubbers.
    Nitrile is very popular too and Viton® for high temperature and chemical applications.
    Metal Cased seals are available for metal to metal mounting and tighter housings.
    Most Oil Seals are designed to accomodate 0.5 bar pressure but P.T.F.E lips can give sealing to 10 bar pressure.
    For certain applications, split seals avoid the need to demount heavy and difficult machinery.

    Oil Seal Selection:

    Body Symbols

    A2

    B2

    B

    BR

    C

    Lip Symbols

    Metal O.D. design with an inner case for greater structural rigidity

    Most standardized and economical metal O.D. design

    Metal O.D. design with fluid side rubber covered

    Part rubber/part metal O.D. design for greater O.D. sealing ability

    Rubber O.D. design for excellent O.D. sealing ability

    S

    SA2

    SB2

    SB

    SBR

    SC

    General nonpressure fluid sealing applications and severe grease sealing conditions

    T

    TA2

    TB2

    TB

    TBR

    TC

    General nonpressure fluid sealing applications and severe grease sealing conditions with light duty exclusion of foreign materials

    V

    VA2

    VB2

    VB

    VBR

    VC

    Economical design for grease retention or sealing viscous fluid

    K

    KA2

    KB2

    KB

    KBR

    KC

    Economical design for grease retention or sealing viscous fluid with light duty exclusion of foreign materials

    WP

     

     

    WPB

     

    WPC

    Dust wiper or scraper for hydraulic or pneumatic cylinder applications

    Requesting the Right Seal

    To request a REPLACEMENT SEAL
    you must know:

    To request a seal for a SPECIFIC APPLICATION
    you must know:

    Type:

    Single Lip, Double Lip, W/Dust Wiper

    S

    Speed of shaft

    Spring Loaded?

    T

    Temperature

    Metal or Rubber OD

    A

    Application

    Size:

    Shaft / Bore / Width

    M

    Media being sealed

    Inch or Metric

    P

    Pressure

    Material:

    Nitrile, Fluorocarbon, etc

    S

    Sizes of surface conditions

     

    RADIAL SHAFT SEAL NOMENCLATURE

    1) Seal Width
    2) Metal Case (Outer)
    3) Housing
    4) Inner Case
    5) Outer Face
    6) Inside Face
    7) Radial Wall
    8) Seal Outer Diameter
    9) Housing Bore Diameter
    10) Spring Position (R-Value)
    11) Spring Groove
    12) Garter Spring
    13) Heel Section

    14) Flex Section
    15) Spring Retainer Lip
    16) Inside Lip Angle
    17) Toe Face
    18) Auxiliary (Dust) Lip
    19) Rib (Helix)
    20) Contact Point
    21) Inside Lip Surface
    22) Spring Set Lip Diameter
    23) Free Lip (Unsprung) Diameter
    24) Contact Line Height
    25) Lip Height
    26) Lip Angle

     

     

    DIMENSIONING A SEAL

     

     

    If you require further information or enquire, please contact us. Simply call us on: +8620 36013580, or e-mail us: sales@dkirubber.com.

      DKI Rubber & Plastic Ltd
    No9, Helong Road, Jiahe, BaiYun District, Guangzhou, 510440 CHINA
    Tel:+86 20 36013580   +86 20 36013581  Fax:+86 20 36013583 Email: sales@dkirubber.com
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