Rotary Seals - Dilanda.it

Radial Oil Seal
n RADIAL OIL SEAL
n The seal
General
Rotary shaft lip seals are components designed in a ring
form, fitted between machine parts in relative rotation,
with the function of separating oil or grease from the
inside and dirt, dust, water etc. from the outside.
The rotary shaft seals are generally composed by an
elastomeric diaphragm, shaped in a “lip form“ and
reinforced with a co-vulcanised metal insert. The sealing
lip is energised with a “Garter Spring“.
Seal design
The sealing lip design corresponds to the current state of
art and is based on many years of experience in a wide
range of application fields.
The sealing edge can either be ready moulded or trimmed
by mechanical cutting.
The total radial force of the sealing lip is given by
elastomer pre-tension together with tensile spring force.
The former depends on the deformation and elasticity of
the rubber material, geometry of the sealing lip and
interference between shaft and seal.
Outer sheath can be either flat or wavy, fitting in both
cases into ISO H8 bore.
Outer sheath
Bottom face (air)
Garter spring
Spring retaining lip
Spring groove
Metal insert
Membrane
Sealing lip
Lip edge
Dust lip
Spring plane
Oil side
Air side
Figure 6 Designations for Rotary shaft lip seals (extract from ISO 6194)
18
Latest information available at www.busakshamban.com
Edition April 2006