Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
4. Performance Data of Formulated Elevance Aria™ WTP 40 Gear lubricants are designed to perform in all three types of lubrication environments: boundary, mixed film and full film. Boundary lubrication occurs when the gear sets start or stop. When the gears are operating at slow speeds, they are in mixed lubrication regime and when they are operating at high speeds, they are in full film lubrication regime. Of course, the introduction of pressure or load into this equation alters the nature of the lubrication. For example, high loads on gears operating in full film regime will change the lubrication regime to mixed film and the higher loads for those operating in the mixed film regime will alter the regime to boundary.
To gain insight on how the new architectures may impact lubricant industry trends mentioned earlier in terms of equipment durability (using wear as a proxy), we made typical formulations using commercially available GL-5 additive package and other commercial materials. We made two formulations at equal viscosity. We compared Elevance Aria™ WTP 40 to a blend of PAO 40 and ester, as per the additive package producer recommendations. We then utilised the MTM and found the Elevance formulation demonstrated less wear in this controlled test under conditions designed to mimic gear operations (Figure 5).
Figure 6. MTM results of WTP 40 vs PAO/ESTER
5. Application Data Automotive gear oils are designed to provide wear protection to driveline components, such as manual transmissions, drive axles (differentials) and non-drive parts, such as steering and rear axles in front-drive vehicles. Their primary functions are to reduce friction between the gear surfaces in contact, dissipate heat and provide protection against damage due to extreme operating pressures. Unlike automotive gear oils that are classified by SAE viscosity grades, industrial gear oils are classified by ISO viscosity grades. Suitable viscosity is determined by the minimum viscosity that maintains hydrodynamic lubrication at operating temperature. Because of this, suitable ISO viscosity grades for industrial gear oils are 100 and above.
The KRL roller bearing test method4 is used to determine the Figure 5. Wear scar measurement of WTP 40 vs PAO
mechanical shear stability of lubricating oils with polymer additives, such as gear oils, engine oils, damper oils and automatic transmission fluids (Figure 7). This test was used to compare Elevance Aria™ WTP 40 versus conventional PAO/ ester neat and in formulation. Elevance Aria™ WTP 40 was formulated with <10% PAO4 and GL-5 gear oil additive package to make 80W140 grade oil. The results show that in both cases Elevance Aria™ WTP 40 offers improved film strength under high shear and temperature conditions.
The MTM was then used to measure the traction forces transmitted across a lubricant film under varying amounts of sliding while controlling load, speed and temperature (Figure 6). The actual traction coefficient measurement over a range of slide-to-roll ratios shows that Elevance Aria™ WTP 40 has even lower friction than a high-performance PAO/ester blend gear lubricant. While these systems are not optimized, this initial data demonstrates that the new synthetic base stock architecture may bring users improved friction and wear. These attributes, in turn, may lead to improved, in-use performance compared to typical mineral and group IV oil-based products.
Figure 7. KRL roller bearing test 38 LUBE MAGAZINE NO.132 APRIL 2016
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