Whether to use engine oil or gear oil for bearings depends on the bearing's operating conditions and design type.
Engine Oil (Lubricating Oil):
Suitable Scenarios: Engine oil is primarily suitable for high-speed, light-load conditions. Under these conditions, engine oil forms a good oil film, providing lubrication and heat dissipation. Engine oil is the common choice for sliding bearings in most conventional scenarios (such as engine crankshafts).
Advantages: Engine oil has good fluidity and can quickly form a lubricating film when the bearing rotates at high speed, reducing friction and wear.
Gear Oil:
Suitable Scenarios: Gear oil is more suitable for high-viscosity environments containing extreme pressure additives, such as the high-pressure environment of gear meshing. Gear oil has high viscosity and extreme pressure properties, providing better lubrication and protection.
Characteristics: Gear oil typically contains extreme pressure additives, which can form a robust lubricating film under high pressure, preventing direct contact and wear between gears.
Other considerations:
Operating conditions: When selecting bearing lubricant, in addition to considering the characteristics of engine oil and gear oil, it is also necessary to determine the specific operating conditions of the bearing (such as speed, load, temperature, etc.). For example, for high-speed bearings that need to operate in high-temperature environments, synthetic lubricants should be selected, as they offer more stable performance and can effectively extend the bearing's life.
Viscosity and viscosity index: The viscosity and viscosity index of the lubricant are also important considerations. Viscosity determines the fluidity and lubrication performance of the lubricant, while the viscosity index reflects the viscosity change of the lubricant at different temperatures. Selecting appropriate viscosity and viscosity index ensures the formation of a good lubricating film and maintains stable lubrication performance when the bearing rotates at high speeds.
