Rotary Shaft Oil Seal

Oil seals, also known as lip seals, are commonly used in driveshafts, crankshafts and hydraulic cylinders where a rotating shaft is lubricated by oil or grease. The seal works like a cap, covering the clearance between the shaft and housing, stopping fluids from leaking whilst preventing contaminants from entering the chamber.

The sealing effect is achieved by preloading the sealing lip, making its internal diameter slightly smaller than the shaft diameter. The garter spring ensures constant pressure and maintains the radial force to the shaft, flattening the sealing edge to a defined width. Underneath this flattened area a thin fluid film is formed. The meniscus acts as an interface between the outside air and the fluid.

The most common elastomers: NBR, FKM (FPM, Viton), ACM (PA), Silicone, EPDM, PTFE, Leather

 

Design Types

Single lip type with garter spring, rubber covered OD, metal insert (A,SC, R21)

 Double (dust) lip type with garter spring, rubber covered OD, metal insert (AS, AS-P,TC, R23)

Cassette type, fully encapsulated, developed especially for the heavy vehicle industry. This seal construction includes the function of an oil seal, a dust seal and a wear sleeve (RWDR)

Combi Seal (SF1, SF5, SF6, SF8, SF19) is a seal developed for extreme wear applications. Combination of oil seal and an additional seal against dirt from the outside in one housing. Primarily for usage in all applications with high level of soiling like farm machinery.

Twin sealing lip type with two garter springs for separating two media (e.g oil and water) A-DUO, DC, BADUO, R22 also known as Fork Seal used for motorcycles

Single lip type with garter spring, outer metal cased (B, SB, R4)

Double lip type with garter spring, outer metal cased (BS, TB, R6)

Single lip with garter spring, metal enclosed (C, SA, R1)

Double lip with garter spring, metal enclosed (CS, TA, R2)

This is a specially designed rotary shaft seal to be used for needle bearing applications. It is reinforced with steel insert and has a single thin lip without spring that, together with minimal interference, has low frictional loss. To fit better into the bore it has rubber waved outer diameter standard profile.

RB/RB9 Gamma Seals combine the ability of mechanical seals to work at high speed and the simplicity of oil seals. They provide a very good seal, reinforced through the action of the centrifugal force. They offer a high degree of sealing effect against contamination from grease, dirt, dust and/or water.

End Cover/End Cap/Blanking Cap (A-EC, VK)

V-Ring (VA, VS, VL, VE, VAX) is an all elastomer axial seal for shafts and bearings. It seals axially against a counter-face. This type of seal has been used widely for several applications and has proved to be reliable and effective against dust, dirt, water, oil splash and other media.

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