The bearing bush is the part of the sliding bearing that is in contact with the shaft. It is very smooth and is generally made of wear-resistant materials such as bronze and friction reducing alloy. In special cases, it can be made of wood, plastic or rubber. Also called "shaft lining", the shape is a tile-shaped semi-cylindrical surface.
A semi-dry or dry friction is caused between the crankshaft journal and the bushing due to insufficient supply or underfeed of the lubricating oil, or if the oil film between the bearing bush and the crankshaft journal is not formed. Every time it occurs, the metal is oil-lubricated and the temperature rise of the bearing bush is not enough to cause discoloration of the bearing bush and overheating of the bearing bush. However, each time the metal is in direct contact, a part of the bearing alloy will be ground down, causing the gap to increase. Over time, repeated Many times, the excessive wear of the bearing bush is caused, and the engine oil pressure is lowered, resulting in the last operation.
