Dynamic pressure bearing and fan structure using dynamic pressure bearing and assembling method thereof

Abstract

The invention discloses a dynamic pressure bearing, a fan structure using the dynamic pressure bearing and an assembling method thereof, wherein the dynamic pressure bearing comprises: a bearing body, a bearing fixing part, an oil storage chamber, a bottom cover and a rotating shaft; The bearing body has a shaft hole, the inner side wall of the shaft hole is provided with a plurality of herringbone-shaped oil guide grooves, the shaft can be rotatably sleeved in the shaft hole; the bearing fixing part is integrally connected to the bottom end of the bearing body, The bearing fixing part has a joint surface, and is engaged with a fixing seat through the joint surface, so that the bearing fixing part is fixed on the fixing seat, and the oil storage chamber is arranged at the bottom end of the bearing fixing part, and the bottom cover is arranged at the bottom of the oil storage chamber. An opening closes the oil storage chamber.

Description

technical field [0001] The invention relates to a dynamic pressure bearing suitable for use in a cooling fan system, a fan structure using the dynamic pressure bearing and an assembly method thereof. Background technique [0002] Press, the cooling fan is one of the main components in the cooling module. In recent years, in order to meet the trend of miniaturization and thinning of information products such as notebook computers and tablet computers, and the continuous improvement of processor operating power, the heat dissipation module must also be miniaturized and thinner while taking heat dissipation into consideration. direction of efficiency improvement. Therefore, the fan used in the heat dissipation module must also be reduced in size and thickness, and at the same time, the fan speed must be increased. In order to meet the needs of miniaturization, thinning and high speed of fans, quite a lot of cooling fans have changed to the design of dynamic pressure bearings ...

AI Technical Summary

Problems solved by technology

[0007] 1. Since the dynamic pressure bearing 8 must be sleeved inside the shaft sleeve 7, and it is necessary to further provide a pressure ring 8a for pressing the dynamic pressure bearing in the shaft sleeve, it will increase the number of parts and increase the cost

[0008] 2. The dynamic pressure bearing 8 must be set inside the shaft sleeve 7, so that the diameter of the dynamic pressure bearing 8 must be reduced, and the diameter of the rotating shaft hole and the rotating shaft 6 of the dynamic pressure bearing must also be reduced. The diameter of the shaft hole and the shaft 6 of the bearing is limited, so that the bearing area of ​​the oil film between the shaft 6 and the shaft hole is reduced, which affects its operation stability

[0009] 3. The dynamic pressure bearing 8 fits inside the shaft sleeve 7 first and then is fixed on the bottom plate 1a via the shaft sleeve 7. Therefore, double fit tolerances will be generated so that the central axis of the shaft hole of the dynamic pressure bearing 8 is easily skewed, so that the shaft 6 And the rotation axis of the fan blade 3 is deflected, resulting in vibration and noise during operation

However, if the pressure ring 8a used to press the dynamic pressure bearing 8 is loose or not securely fastened, the relative rotation between the dynamic pressure bearing 8 and the shaft sleeve 7 will occur.

[0011] 5. The commonly used dynamic pressure bearing 8 is fitted inside the shaft sleeve 7. However, due to the miniaturization of the heat dissipation fan, the size of the dynamic pressure bearing 8 is also quite small. As long as it is slightly pressed by the shaft sleeve 7, it may make the The size or roundness of the rotating shaft hole of the dynamic pressure bearing 8 is affected, which will cause errors in the size of the gap between the rotating shaft hole of the dynamic pressure bearing 8 and the rotating shaft 6 or uneven gaps, which will cause the oil film to fail to establish. So that the shaft is prone to wear and tear

[0012] 6. In addition, most of the commonly used methods of forming the oil guide groove in the dynamic pressure bearing structure are to form the oil guide groove on the inner wall of the shaft hole of the dynamic pressure bearing by etching or molding. However, the commonly used In the manufacturing method, the size and depth precision of the oil guide groove cannot be precisely controlled, so the dynamic pressure bearing cannot effectively establish an oil film

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