Automotive Rotating Shaft Seals

Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of automotive rotating shaft seals in China, also supports customized service. Please feel free to buy high quality automotive rotating shaft seals for sale here from our factory.

Automotive rotating shaft seals

Even the simplest automobiles require a variety of seals, including rotating shaft seals.

Rotary shaft seals
The purpose of a rotating shaft seal is to prevent the leakage of oil, grease and other fluids (e.g. transmission oil, brake fluid, air conditioning refrigerant) while protecting against the ingress of environmental contaminants. These seals, sometimes called oil or grease seals, are used with bearings to retain lubricant within the bearing and prevent environmental contamination (i.e., lubrication retention). The term "spin" refers to their ability to perform in rotational and rotational movements.

Where rotary shaft seals are used in the automotive industry
Rotary shaft seals are an essential component of many components and systems in cars, trucks, buses, performance vehicles and motorsport. EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles) also require seals. These seals can also be used on ATVs (All Terrain Vehicles).

Some of the most common application areas in automotive transportation are:

Air-conditioning compressor
Braking System
Pump
gearbox
power transmission
steering wheel

In most of these applications, seal failure can result in serious consequences, including personal injury, vehicle damage, and danger to those around the vehicle. Therefore, it is important to find the right high-quality seal for your application.

Automotive seal working conditions

While conditions for automotive rotating shaft seals vary depending on their specific application, the most common operating environments include; extreme temperatures;

environmental factors;

Vibration and shock loads;

high pollution exposure;

chemical compatibility
low friction
Wear resistance

Comply with automotive standards

Environmental factors include exposure to sunlight, ozone, UV rays and oxidation, all of which can accelerate seal degradation. Contaminants can include water, dirt, grease and other debris, while seals can be exposed to materials such as diesel fuel, hydraulic oil, brake fluid, coolants and chemical solvents.

Materials used in rotary shaft seals
The basic components of a spring-energized seal include a flexible inner sealing lip bonded to a rigid outer component. Additionally, some of these seals may include a spring-applied device to keep the lip in contact with the sealing surface (note that spring-applied seals are most commonly used for oil retention, not grease retention). Additionally, some applications may require a seal with two lips, one of which serves as a dust lip or dust lip to further prevent contaminants from entering.

The outer material of the rotating shaft seal is responsible for positioning and retaining the seal in the seal housing. This part of the seal is typically made from stainless steel, aluminum, or a rigid non-metallic composite material.

The sealing lip itself is made of elastomers or polymers, with high-performance PTFE being one of the most commonly used polymers. PTFE meets all the requirements for an effective, reliable sealing lip, including the ability to handle high pressures, broad chemical compatibility, extremely low friction and excellent wear resistance. PTFE can also contain additives such as carbon or MoS2 to enhance properties such as strength, stiffness, wear resistance and low friction.

Nitrile rubber (NBR, Buna-N) and polyacrylate rubber (ACM) are elastomeric materials widely used in automotive rotating shaft seals. Another commonly used elastomer class is fluoroelastomers, often referred to as FKM, Viton, and FPM. They offer superior performance but cost more than nitrile rubber and polyacrylates.

PTFE rotary shaft seal
We strongly recommend the use of PTFE rotary shaft seals in the automotive industry wherever possible. They provide superior performance in the harsh conditions often involved and are the most chemically compatible, lowest friction polymers on the market today. They outperform elastomeric materials and are rapidly replacing their use in many applications.

There are a variety of PTFE options available, including

Virgin PTFE: Low-speed, light-duty applications
25% glass-filled PTFE: Resistant to abrasion and extrusion, but will wear on shafts below 62C hardness
23% Carbon/2% Graphite Filled PTFE: General purpose applications requiring resistance to crushing and deformation
15% glass/5% MoS2 filled PTFE: Excellent wear resistance makes it ideal for higher speed

Application
Polyimide-Filled PTFE: Works well with soft materials like 300 SS and aluminum due to its low wear rate
Modified PTFE: higher mechanical strength and better wear resistance.

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