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2025年6月16日 星期一
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FFKM全氟醚橡胶密封件
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径向骨架油封-Turcon Radial oil seal

径向骨架油封-Turcon Radial oil seal

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 of an

elastomeric diaphragm, shaped in a “lip form“ and

reinforced with a co-vulcanized metal insert. The sealing

lip is energized with a “Garter Spring“.

 

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 molded 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.

 

Material

Spring steel SAE 1074, DIN 17223 is normally employed. If

resistance to corrosion is required stainless steel AISI 304,

DIN 1.4301 is used. Garter springs of bronze or similar

materials are not recommended, since they tend to fatigue

after long service life or as a result of exposure to high

temperatures. In special cases the garter spring can be

protected against fouling by means of a thin rubber hose.

 

Type and designations of materials

Nitrile rubber (NBR)

Acrylic rubber (ACM)

Silicone rubber (VMQ)

Fluorinated rubber (FKM)

Hydrogenated Nitrile rubber (HNBR)

Compound

The material selected must take into account

environmental conditions and function requirements.

Some of the requirements associated with environmental

considerations are:

- Good chemical resistance

- Good resistance to heat and low temperature

- Good resistance to ozone and weathering

The functional demands include:

- High resistance to wear

- Low friction

- Low compression set

- Good elasticity

In addition, cost considerations render ease of processing a

desirable feature. Trelleborg Sealing Solutions can supply

the optimum material for each application.

 

Nitrile Rubber (NBR)

Advantages:

- Good oil resistance

- Good heat resistance up to 100°C in oil

- High tensile strength (special compounds over 20 MPa)

- High elongation at break

- Low swelling in water

Limitations:

- Poor weather and ozone resistance

- Poor resistance against polar fluids (ester, ether, ketones

and aniline)

- Poor resistance against chlorinated hydrocarbons (carbon

tetrachloride, trichlorethylene)

- Poor resistance against aromatic fluids (e.g. benzene,

toluene)

Fluids, mineral oils and above all high-alloyed mineral oils

(hypoid oils) containing larger quantities of aromatic

hydrocarbons have a high swelling effect on NBRcompounds.

The swelling behavior can be improved by

increasing the acrylonitrile content.

However an inferior cold flexibility and resistance to

compression set must be accepted. The additives in highalloyed

oils can in certain cases cause an additional

interaction between the elastomer and the additive, thus

influencing the elasticity.

Hydrogenated Nitrile Rubber (HNBR)

Advantages:

- Good oil resistance, also in hypoid oils

- Good heat resistance, up to + 150 °C

- Good mechanical properties

- Good weather and ozone resistance

Limitations:

- Poor resistance against polar fluids (esters, ethers,

ketones and aniline)

- Poor resistance against chlorinated hydrocarbons (carbon

tetrachloride, trichlorethylene)

- Poor resistance against aromatic fluids (bensene, toluene)

Polyacrylic Rubber (ACM)

Advantages:

- Good resistance against oils and fuels (better than Nitrile

rubber)

- Heat resistance about 50 °C better than for Nitrile rubber,

150 °C in oil and 125 °C in air

- Good weather and ozone resistance

Limitations:

- Not usable in contact with water and water solutions,

even smaller quantities of water in oil

- Limited cold flexibility to about -20 °C, somewhat poorer

than normal NBR

- Limited tensile strength and tear resistance, especially

above 100 °C

- Poor wear resistance (considerably inferior compared to

NBR)

- Poor resistance against polar and aromatic fluids and

chlorinated hydrocarbons

Radial Oil Seal

Latest

 

Fluorinated Rubber (FKM)

Advantages:

- The resistance against oils and fuels is better than for any

other rubber type

- The only highly elastic rubber material, which is resistant

to aromatic and chlorinated hydrocarbons

- Excellent heat resistance, the best one after silicone

rubber, up to 200°C

- Excellent weather and ozone resistance

- Excellent acid resistance (only inorganic acids, not

suitable for organic acids e.g. acetic acid)

Limitations:

- Limited cold flexibility, to approx.-20°C to -25°C

- Limited tensile and tear strength, especially above 100°C

- High compression set in hot water

- Poor resistance to polar solvents

Silicone Rubber (VMQ)

Advantages:

- Best heat resistance of all rubber types

- Best cold resistance of all rubber types

- Excellent weather and ozone resistance

- Resistant against aliphatic mineral oils and most grease

types

Limitations:

- Poor tensile and tear strength for standard compounds

- Poor wear resistance

- Poor resistance against aromatic oils and oxidized

mineral oils

- Poor diffusion resistance

Radial Oil Seal

Latest

 

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