Sleeve is a mechanical parts, it is set on the rotating shaft of the cylinder, is a component of the sliding bearing, made of the whole cylinder-shaped sleeve to protect the shaft is called the sleeve, and the opposite is the shaft tile, it is equivalent to the outer ring of the sliding bearing, and the sleeve is the whole, and relative to the shaft is the movement, while the shaft tile has is divided into pieces, relative to the shaft is rotating. Generally speaking, the sleeve and the housing use an interference fit, while the shaft uses a clearance fit.

The sleeve can reduce the wear of the shaft and seat, thus extending the service life of the machine, secondly, it can fix the position to ensure the normal operation of the machine, the sleeve can also withstand sliding, reducing friction, thus reducing energy loss, the sleeve can also play a role in heat dissipation, to ensure the normal operation of the machine, but also to reduce friction, thus reducing noise, the sleeve has a variety of materials, including brass, cast iron, steel and so on.