Prevents or reduces direct contact between the rolling elements, raceways and cages in the bearing, reducing friction and wear.

An oil film is formed on the friction surface, and when the pressure oil film is formed, the contact bearing area of the part can be increased, and therefore, the effect of reducing the contact stress and prolonging the rolling contact fatigue life can be achieved.

The lubricant has anti-rust and anti-corrosion effects.

Oil lubrication also has the effect of dissipating heat and removing worn particles or invading contaminants from the operation of the bearing.

Grease lubrication can increase the seal to prevent the intrusion of external contaminants.

It has a certain effect of vibration and noise reduction.