For the pursuit of the ultimate mute users, double ball bearing fan because of its unique sound is difficult to use long been abandoned, and seals bearing fan is because a shorter life and much criticized, in this environment FDB (dynamic hydraulic bearing) bearing appeared, in fact, this is an oil-lubricated bearings, using the film in exchange for better noise performance and seismic performance. The author got a monster senior players to write an article about the FDB bearing ChipHell essay, I hope to be able to help everyone understand the FDB bearings.

      Dynamic liquid bearings are usually used in precision machinery industry, which uses liquid oil bearing mucosa to film instead of the ball. This prevents direct metal surface friction, noise, and temperature will be kept to a minimum; while film can effectively absorb vibrations, so that the seismic capacity is improved; also reduce wear and improve life.

　　Test data one: 8025 operating under the same conditions, the temperature of the fan performance corresponding time.

　　Test Data II: In the background noise 6.7dBA environment, the fan is placed at 1.0 m from the microphone, several fan noise compare three kinds of bearings.

　　Three test data: Size double ball bearings and FDB bearing fan noise performance comparison of different heights after falling.

　　Three test data: Size double ball bearings and FDB bearing fan noise performance comparison in the future long-term operation.

　　FDB bearing fan structure

　　FDB bearing DC fan works

　Because the axis of the shaft suite full of the right amount of liquid oil, and shaft machining time with sophisticated fine groove, rotation starts, the oil pressure into fine grooves intersection vertex (see below), resulting in greater pressure makes the shaft when the rotation is always separated from the sleeve, the friction reducing bearing life is increased.