It is the common name of axial alloy sleeve! Because there are two more half-moon folding spindles! Shaped like old-fashioned tiles! So it's called bearing bush!
Bearing bush is a multi-element alloy with copper as the main component! Also called copper tile!
Bearing shells are widely used in large steam turbines, generators and other equipment, and are lubricated by babbitt alloy and high-pressure oil.