Oilless Bearing Mounting Guide
The oilless bearing, is a novel type of lubricated bearing that combines the characteristics of metal bearings and oilless lubricated bearings. It consists of a metal substrate that bears the load and special - formula solid lubricant materials responsible for lubrication. These bearings feature high load - carrying capacity, shock resistance, high - temperature endurance, and strong self - lubricating ability. They are especially suitable for heavy - load, low - speed, reciprocating, or oscillating scenarios where lubrication and oil - film formation are difficult. Moreover, they are not affected by water flushing or the erosion and scouring of other acidic liquids.
Here are the precautions to take when installing oilless bearings:
1.Check whether there are any collisions or protrusions on the mating surfaces of the shaft center and bearing housing. If present, remove them using oil - free abrasive stones or fine - grit sandpaper.
2.Ensure that no dust or mold sand is attached to the bearing housing surface.
3.To prevent damage during installation, apply a small amount of lubricating oil to the surfaces of the shaft and bearing housing. When installing the bearing on the shaft center, apply force to the inner ring. When installing it into the bearing housing, apply force to the outer ring. When applying force to the bearing, make sure the force is vertical and evenly distributed. Avoid eccentric impact, which can damage the bearing. If using a hammer and sleeve for installation, never strike the bearing directly. Instead, use a sleeve as an intermediary and gently hammer it in. If the internal and external rings are both interference - fitted in the mechanical structure, use a shim to ensure that force is applied to both rings simultaneously. If force is only applied to the inner ring, it will be transmitted through the rolling elements to the outer ring, causing damage to the raceway.
4.Never apply force to the oilless bearing's retainer or seal plate. When installing a bearing with a large clearance on a shaft, one common method is to heat the bearing in clean oil to 80 - 90 degrees Celsius to expand the inner diameter for installation. However, the temperature must not exceed 100 degrees Celsius to prevent a reduction in bearing hardness. During heating, the bearing should be suspended with wire or placed on a metal mesh or support plate, and must not be placed at the bottom of the trough. Once the bearing reaches the desired temperature (below 100 degrees Celsius), immediately remove it from the trough and quickly mount it on the shaft. As the bearing cools and contracts, a gap may form between the shaft shoulder and the bearing end face. In this case, use a tool to press the bearing towards the shaft.
5.Before leaving the factory, oilless bearings are coated with rust - preventive oil or grease to protect the raceway and rolling elements from corrosion. Therefore, they should be cleaned before installation. Bearings sealed with rust - preventive oil can be cleaned directly with gasoline or kerosene. For those protected with thick oil or rust - preventive grease, first use a light - weight mineral oil, such as 10 - weight motor oil or transformer oil, heated to dissolve the grease. After cooling, clean with gasoline or kerosene. Bearings with double - sided dust covers or seals have already been pre - lubricated and do not require cleaning before installation. IKO bearings coated with a dual - purpose lubricating and rust - preventive oil also do not need cleaning before installation. During the cleaning and installation process, it is crucial to prevent foreign particles from entering the bearing, as even tiny abrasive particles can cause wear between the rolling elements and raceway, increasing noise and vibration.
If you have questions about your installation, feel free to ask this email address:sales01@ramshin.com
