N0.10


MEETING THE NEEDS OF MODERN INDUSTRIAL GEAR OILS


Lubrizol observe lubricants based on sulphur- phosphorus chemistry provide greater protection and performance.


Industrial gear oils operate under more diverse conditions and applications than automotive gear oils. The gears can be as large as 10 meters in diameter and incorporate spur, bevel, helical and spiral bevel designs in an endless variety of configurations. Industrial gear oils typically must function in the presence of large quantities of water, which can cause rust, corrosion and a loss of protection . These oils also are used in highly contaminated environments. To make matters worse, modern gearboxes have been downsized and operate at higher speeds and loads, resulting in higher operating temperatures.


To meet the demands of today's industrial gear drives, a lubricant must meet a variety of performance requirements. The minimum performance requirement for industrial gear oil is heavy-duty extreme pressure (EP) performance combined with rust, corrosion and oxidation resistance in the presence of water, scale and heat. A higher, premium level of performance adds thermal stability and cleanliness to the baseline requirements. Top-tier performance includes durability requirements such as high temperature EP


GEAR TEST RESULTS Tests


4-Ball Wear Scar Diameter (mm) 4-Ball EP Weld Load (kg) 4-Ball EP LWI (kg) Timken OK Load (lb)


Copper Strip Corrosion (ASTM D130)


Turbine Oil Rust A- Distilled Water B - Synthetic Water


S-200 Viscosity Increase(%)


ASTM D 1401 Demulsibility@ 82°C Oil-Water-Emulsion (ml)


ASIM D 2711 Demulsibility@ 82°C Water in Oil(%)


Total Free Water (ml) Emulsion (ml)


ASIM D 2711 Demulsibility@ 54°C Water in Oil (%)


Total Free Water (ml) Emulsion (ml)


protection, extended demulsibility and foam inhibition in the presence of contaminants. Compatibility with various mineral and synthetic base fluids is also a concern.


Two important trends in the development of industrial gear oils are:


•


Increased emphasis by end users on reducing costs. They are demanding longer lubricant life, which reduces maintenance and disposal costs.


• Design changes to improve efficiency. Today's smaller gearboxes operate at higher speeds and loads, resulting in higher operating temperatures.


They also have smaller oil capacities, so less lubricant is available to cool the equipment and suspend contaminants.


The United States Steel (USS) 224 Specification for Non-lead, EP Industrial Gear Oils is one of the most widely recognised specifications in the U.S. industry. It was written and released in the early 1980s to address the use of sulphur-phosphorous formulations. The American Gear Manufacturers Association (AGMA) upgraded its AGMA 250.04 enclosed gear oil specification shortly after USS 224 was released.


Recently, Lubrizol developed new additive technology to improve the performance of modern industrial gear oils.


Commercial Oil 0.29 250 55.1 80 1A


Pass Pass 3.7


40/40/0 (20) 1


84.6 0


2.3


79.5 0.1


New Oil


0.29 250 60.5 75 1A


Pass Pass 4.88


40/40/0 (1 0)


0.2 84.1 0.1


1.6


81.4 0.1


(Continued on Page If) 110.1 o • m.nu 1 QQQ 2 80 Requirements


0.35 max 250 min 40 min 60 min 1B min


Pass Pass


6.0 max


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