The oil-retaining bearing fan comprises an oil-retaining bearing, the oil-retaining bearing is provided with an oil groove, an upper oil channel and a lower oil channel, and the oil groove, the upper oil channel and the lower oil channel are communicated with an
oil storage area; and an oil sealing cover is arranged above the oil bearing. The
oil storage amount is increased, oil volatilization is reduced, and the service life of the bearing is prolonged; the oil way circulation method comprises the steps that when the fan blades start to rotate, the shaft core in the oil-retaining bearing starts to rotate, lubricating oil overflows from the oil groove, the upper oil way and the lower oil way due to friction between the shaft core and the inner hole wall of the oil-retaining bearing, and a thin
oil film is formed on the surface of the oil-retaining bearing; the fan blades generate heat in the rotating process, and lubricating oil in the
oil storage area expands due to heating and overflows to the contact face of the oil bearing from the oil groove, the upper oil channel and the lower oil channel. When the fan blades stop rotating, the lubricating oil flows back into the oil
storage area through the oil groove, the upper oil channel and the lower oil channel due to
temperature drop.