Extreme Pressure Gear Oil:How EP Additives Protect Gear Under Heavy Load?
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In the lowest speed and high load gear transmission application, there is a lubricant state, which leads to failures due to adhesive wear. When the oil thickness is less than the rough peak of the metal surface, boundary lubrication will appear. And this is called a boundary state.
In order to deal with the wear problem under boundary state, the extreme pressure (EP) gear oil additive is developed.
What is extreme pressure gear oil?
When the gear is operating under heavy load, high temperature, and intense friction will occur on the meshing gears' surfaces, leading to wear and occlusal failure of the metal surface. After adding EP gear oil additives, when the temperature rises to a certain extent, the additives will have a chemical reaction on the metal surface and form a strong phosphide or sulfide protective film.
This film can bear high pressure, reduce the friction coefficient to prevent the direct connection of metals, and prolong the gear life span.
The EP additive is used to prevent adhesive wear and protect parts when the oil viscosity is not able to provide essential oil thickness.
How does the EP additive protect the gear from wear?
EP additives and gear oils work together to form a chemically bonded lubricating oil film. When driving, the inner gears and parts will move and touch each other, and produce wear. This wear will improve the gear oil's temperature to increase the chemical reaction in the gear oil EP additives.
With the temperature rising due to the moving of gears, the polar molecule in the extreme pressure (EP) will begin to connect with the differential's gear and metal components to form an EP protective film on the metal.
This will minimize the direct contact between metals that could cause deterioration or wear on the gear surface.
The difference between EP gear oil and common gear oil
|
Project |
Extreme Pressure(EP) Gear Oil Additive |
Common Gear Oil Additive |
|
Core Application |
• heavy-duty and high-impact load equipment |
•suitable for light load and smooth operationof equipment |
|
Protective Mechanism |
EP antiwear additive: it depends on the special additive forming a chemical protective film under high pressure and high temperature to prevent gear wear, pit corrosion, and gluing. |
Base oil lubrication: it only depends on the viscosity of the base oil to form a lubricity film. The oil film is easily broken under extremely high pressure and leads to the metals' direct connection. |
|
Key Additives Types |
Sulfurized additives: it needs high thermal stability, low corrosion, and excellent solubility Phosphorus additive: it has the functions of pressure resistance, anti-wear, anti-oxidation, thermal stability, low corrosion, and good compatibility. Chlorine additives: their use has gradually decreased due to toxicity and environmental issues. |
It usually contains no or only a small amount of EP additives and mainly relies on anti-wear additives to protect medium loads. |
|
Comprehensive Performance and Lifespan |
A longer oil change cycle: excellent anti-oxidation makes it more stable under high temperature and delays aging. More comprehensive protective: excellent anti-rust and anti-emulsification ability to cope with harsh environments. Prolong the device lifespan: by reducing wear to prolong the gearbox life. High comprehensive benefits. |
It has a basic anti-oxidation, anti-rust, and anti-emulsification ability. The oil is aging quickly under harsh working conditions, with a short oil-changing period. It has limited protection for equipment and is not suitable for heavy load applications. |
Gear oil EP additive, Chorus solution: multi-functional gear oil additive package T4218
Gear oil EP additive Chorus T4218 is an environmentally protective and a low odor multi-functional gear oil additive and is designed for API GL-5 vehicle gear oil and industrial gear oil. It has a reasonable formulation and excellent oil solubility, which makes it soluble with API I, II, III, and PAO base oil. It endows the product oil with excellent loading capacity and anti-wear ability.
T4218 is suitable for heavy loading and high-impact gear systems to provide reliable and enduring protection.
