PAG base oil: better solution for worm gear oil lubrication

With the development of the economy, industry gear box is developing towards greater power and transmission efficiency, higher load capacity, and smaller size. It also puts higher requirements on the performance of gearbox lubricant oil, such as lubricity, antiwear properties, friction efficiency, and corrosion inhibitor performance.

 

Common problems with traditional lubricants in worm gear systems.

The worm gear mechanism derives power through the meshing of a steel worm and a bronze worm wheel, the gear has a relative sliding velocity between tooth surfaces, large friction heat and the temperature rising is quick, which can result in dry abrasion, scratches, scuffing, and wear, under heavy load, it will appear worm gear scuffing and even cause frequent downtime because of the short worm gear oil service life.

Therefore, choosing excellent viscosity-temperature and low-temperature performance- PAG (Polyalkylene Glycol) is the better solution for the above problems.

 

The comparison among the 3 lubricant base oils

Drawbacks of mineral-type worm gear oils: They are unsuitable for lubricating worm gear sets subjected to heavy loads or those experiencing vibration and shock during operation; mineral worm gear oils cannot be used for long-term operation at oil temperatures exceeding 100℃ and are prone to causing overheating at the contact points of the worm gear set.

Compared with mineral oil, PAOs, PAG has a more excellent viscosity temperature performance and anti-friction properties.

 

The core mechanism advantages of PAG base oils

Polyalkylene Glycol is synthesized through the polymerization of ethylene oxide (EO) and propylene oxide (PO); its molecular chains are rich in polar ether-oxygen bonds (-o-), which can form a strong adsorbed film on the metal surface that can transform sliding friction into shear sliding between molecular layers.

• Extreme reduction in friction and energy saving: the polar oxygen atom in PAG molecular chains reacts with the metal surface and forms a strong adsorption film, transforming the sliding friction to shear friction, reducing friction and improving transmission efficiency.
• Extreme heat conduction and heat dissipation: the heat conduction efficiency of Polyalkylene Glycol base oil is 10% higher than mineral oils, which can move the friction heat efficiently. And the oil's temperature can be reduced by at least 15℃ to retard thermal aging of oil products.

PAG Worm Gear Oil-Additive Compatible System

• Anti-oxidation additives: prolong the oil change period

The worm gear oils' temperature often exceeds 100℃, and high-temperature oxidation is the main reason for oil failure. The cooperation of hindered phenols and alkylated diphenylamines anti-oxidation additives results in minimal viscosity change upon oxidation and no corrosion to copper worm gears; with the stable viscosity, significantly extending oil change intervals.

• Rust and corrosion inhibitor: the steel-copper friction balancer

Worm (copper) and worm gear (steel) are different metals that are prone to electrochemical corrosion in a humid environment. Therefore, it needs to have a balance between copper and steel rust prevention. Excessive activity leads to copper worm; lack of the worm gear and gearbox will cause rust. Sulfur-nitrogen heterocyclic compounds can meet the dual requirements of achieving a copper corrosion rating of 1b and showing no rust in the liquid-phase rust test.

• Extreme pressure (EP) additive-heavy load sintering resistance.

Under boundary lubrication, extreme pressure (EP) additives can react with the metal surface to form a low shear strength chemical reaction film to replace the oil film and bear load.

A phosphorus-based extreme-pressure agent can ensure the worm gear will not experience gear surface sintering or bonding under extreme conditions like loading impact to protect the gear surface and prolong the equipment maintenance period.

 

Chorus is a professional lubricant additive manufacturer; we can provide you with various types of lubricant oil additives and base oils, including different viscosities of PAG (Polyalkylene Glycol) base oil and other excellent additives for worm gear use, such as high-temperature anti-oxidation additives, metal rust and corrosion inhibitors, and extreme pressure (EP) additives.

 

Also, we can provide you with various lubricant gear oil additive packages to protect the worm and worm gear.

Please contact us to get the latest price and information.