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FDB bearing technology analysis: oil seal is not durable, double rolling is too noisy

[Author: Jiang Rui Bearing] [Date: 2017-04-13] [heat: ]

For users seeking extreme silence, dual-ball fans are discarded because of their unique bearing sounds, which are difficult to use for a long time, while oil-sealed bearing fans are criticized for their short service life. (Hydraulic bearings) bearings have appeared. In fact, this is also an oil-lubricated bearing. The oil film is used in exchange for better noise performance and seismic performance. This time, I found a short article about FDB bearings written by a senior player monster from ChipHell, hoping to help everyone understand FDB bearings.

Dynamic liquid bearings are usually used in the precision machinery industry. It uses mucosal liquid oil bearings, which use oil film instead of balls. In this way, direct friction of the metal surface can be avoided, and noise and temperature can be minimized; at the same time, the oil film can effectively absorb vibrations and improve the shock resistance; it can also reduce wear and increase life.

Test data 1: The temperature performance of the 8025 fan running under the same conditions for the corresponding time.

Test data 2: In a 6.7dBA background noise environment, place the fan at a distance of 1.0 m from the microphone, and compare the noise of the three bearings of several fans.

Test data three: Comparison of noise performance of double ball bearing and FDB bearing fans of the same specifications after falling at different heights.

Test data three: Comparison of noise performance of double ball bearing and FDB bearing fans with the same specifications after long-term operation.

Structure of FDB bearing fan


Working principle of FDB bearing DC fan

Because the shaft sleeve is filled with an appropriate amount of liquid oil, and the shaft core is processed with precise thin grooves, when the rotation starts, the pressure pushes the oil to the apex of the fine grooves (see the figure below), which generates greater pressure to make the shaft core It is always separated from the shaft sleeve during rotation, and the life of the bearing is increased after the friction is reduced.


How about, after reading this article, are you still superstitious about double ball bearings?

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