What should you consider when selecting lubricants for rolling bearings

The selection of lubricant for rolling bearings is a key factor in ensuring their normal operation and extending their service life.

Base oil selection:

Viscosity: The viscosity of a lubricant is one of its most important physical properties. The viscosity directly affects the thickness and stability of the lubricating film formed by the lubricating oil in the bearing. In general, high-load, low-speed bearings usually require high-viscosity lubricants, while high-speed bearings require low-viscosity lubricants.

Operating temperature range: The operating temperature range of lubricating oil needs to consider the temperature of the bearing's working environment. A suitable lubricant should be able to maintain stable lubrication properties over the expected temperature range.

Additive selection:

Antioxidants: Used to prevent lubricating oil from oxidizing at high temperatures and improve its heat resistance.

Anti-wear agent: Helps reduce bearing friction and extend service life.

Anti-corrosion agent: Prevent moisture and acidic substances in the lubricating oil from corroding the bearing surface.

Selection of solid lubricants:

Solid lubricants: Such as solid coatings or solid particles added to grease to provide additional lubrication protection under extreme conditions. Common solid lubricants include molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE).

Grease selection:

Base oil and thickener: Grease usually consists of base oil and thickener. Selecting the appropriate base oil and thickener depends on bearing operating conditions such as temperature, load and speed.

Resistance to Hydrolysis: Resistance to hydrolysis is an important consideration if the grease may be exposed to water or moisture.

Operating temperature range: The operating temperature range of the grease needs to match the operating environment of the bearing.

envirnmental factor:

Chemical environment: If there are specific chemicals in the bearing working environment, the lubricant selection needs to consider its compatibility with the lubricant.

Sealing: Consider whether the bearing is sealed to determine the fluidity and stability of the lubricant.

Application method:

Oil immersion, oil mist, oil injection, etc.: The selection of lubricant also needs to consider the lubrication method. Different application methods may require different types of lubricants.