A lubrication method in which the bearing part is immersed in lubricating oil and the oil is brought into other parts of the bearing after the bearing is running. Oil bath lubrication is one of the most common and simple lubrication methods.

Considering the stirring loss and temperature rise during oil bath lubrication, for horizontal shafts, the height of the bearing part intruding into the lubricating oil should be limited. Generally, the oil level is controlled near the center of the lowest rolling element of the bearing. Oil bath (oil immersion) lubrication is sufficient, but the oil supply is not easy to adjust. If there is no filter device in the oil tank, it is easy to bring impurities into the inside of the bearing and damage the bearing. Oil bath (oil immersion) is generally suitable for low-speed or medium-speed situations. It is commonly used on low-speed bearings.

Lesson learned: Separable reinforcing ribs can be installed at the bottom of the bearing housing to reduce agitation and/or dissipate heat. The static oil level should be slightly lower than the center of the lowest rolling element of the bearing applied to the horizontal axis. For the vertical axis, the static oil level should cover 50%-80% of the rolling elements. If the bearing temperature is relatively high when using an oil bath system, you can use a dripping, splashing or circulating oil system instead.