Long Life Synthetic Gear Oils
Composed of petroleum or synthetic lubricant base oils with the addition of extreme pressure anti-wear agents and oily additives, gear oil is indispensable in gear transmission devices. It helps prevent tooth wear, abrasion, sintering, and other issues, thereby extending the service life of the gears and improving power transmission efficiency, while reducing power loss.
Product Details：Long Life Synthetic Gear Oils
Effective gear oils require robust anti-wear and load-carrying characteristics along with a suitable viscosity. They must also demonstrate good thermal and oxidative stability, anti-foaming properties, water separation efficiency, and rust prevention. Given that gear loads often reach 490 MPa or higher, and hyperbolic tooth loads can exceed 2942 MPa, extreme pressure anti-wear additives, typically sulfur-phosphorus or sulfur-phosphorus-nitrogen types, are added to gear oils to prevent oil film failure caused by wear and abrasion. Gear oils represent around 6% to 8% of all lubricating oils.
PARAMETER：
Sports Event | Quality Indicators | Test Methods | ||||||
Viscosity grade | 100 | 150 | 220 | 320 | 460 | 680 | ||
Kinematic viscosity (40°C) mm²/s) | 90-110 | 135-165 | 198-242 | 288-352 | 414-506 | 612-748 | GB/T265 | |
Viscosity index | not less than | 90 | 90 | 90 | 90 | 85 | 85 | GB/T1995 |
Open flash point,℃ | not less than | 200 | 200 | 200 | 200 | 200 | 200 | GB/T3536 |
Pour point,°C | not exceeding | -12 | -9 | -9 | -9 | -9 | -5 | GB/T3535 |
Steel sheet corrosion(100°C,)(3 hours)/grade | not greater than | 1 | GB/T5096 | |||||
Corrosion test(distilled water) | rust-free | GB/T11143 | ||||||
Foaminess (Foam propensity/foam stability) mL/mL 24°C 93.5°C Post 24°C | not greater than not greater than not greater than | 50/0 50/0 50/0 | GB/T12579 | |||||
Tim ken test(OK load) /N(Lb) | not less than | 267(60) | GB/T11144 | |||||
Anti-emulsification (82℃)Water in oil /%(mass fraction), emulsion layer /ml,total separated water/ml | not greater than | 2.0 1.0 80.0 | GB/T8022 | |||||
Four-ball test Load wear index/ N Sintering load(P value)/N | not less than not less than | 441(45) 2450(250) | GB/T3142 | |||||
CL-100 Gear Test (A/8.3/90) | not less than | 12 | >12 | >12 | >12 | >12 | >12 | SH/T0305 |
1. Characteristic
Gear oil's most elementary properties encompass an apt viscosity and a suitable viscosity temperature. A viscosity that is on the higher side results in a thicker lubricating film, offering greater resistance to loads.
Extreme pressure and wear resistance are the linchpins of gear oil's properties and characteristics. Given that gear loads often surpass 490 MPa, and hyperbolic tooth surfaces can withstand loads as high as 2942 MPa, the incorporation of extreme pressure anti-wear agents in gear oil is crucial to safeguard against tooth surface wear and abrasion stemming from oil film rupture. In the past, additives like sulfur-chlorine, sulfur-phosphorus-chlorine, sulfur-chlorine-phosphorus-zinc, sulfur-lead, and sulfur-phosphorus-lead were widely used. Nowadays, sulfur-phosphorus or sulfur-phosphorus-nitrogen additives have become the norm.
2. Main Indicators
When choosing gear oils, viscosity is a key consideration. The SAE, in 1983, established seven grades of automotive gear oils based on their kinematic viscosity at 98.9°C (210°F). Grades 70W, 75W, 80W, and 85W are intended for winter and cold climates, with minimum usage temperatures of -55°C, -40°C, -26°C, and -12°C, respectively. The other three grades, 90, 140, and 250, represent progressively higher viscosities. In recent years, the trend towards energy efficiency has seen an increase in the use of low-viscosity, thickened oils (multigrade gear oils) that are suitable for all seasons. Industrial gear oils share the same viscosity classification as lubricating oils, utilizing the kinematic viscosity at 40°C center value.
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