Production method of bearing device

Abstract

A production method of a bearing device comprises the steps as follows: providing a bearing mold; injecting a mixture of metal powder and a fusion binder into the bearing mold in an injection molding mode to form a bearing body blank and an upper cover blank respectively; removing the binder in the bearing body blank and the upper cover blank; sintering the bearing body blank and the upper cover blank to produce a bearing body and an upper cover; and assembling the upper cover on the bearing body to form the bearing device. The production method of the bearing device reduces follow-up processing amount effectively and can produce parts with high melting point, high strength and complex shape more conveniently compared with other molding modes.

Description

technical field [0001] The invention relates to a method for manufacturing a bearing device. Background technique [0002] At present, bearings are widely used in various equipment, especially dynamic pressure bearings are more commonly used in electronic devices, such as hard disk drives (HDD), compact disc drives (CD-ROM), digital video disc players (DVD), miniature discs Machine (MiniDisc), magneto-optical disk (MO) and cooling fans and other fields, the bearings of the motors in these devices are small in size, and the requirements for the rotation accuracy and life of the bearings are high. [0003] The dynamic pressure bearing forms a layer of fluid (gas or liquid) lubricating oil film in the tiny gap between the rotating shaft and the bearing. The lubricating oil generates a dynamic pressure effect through the shear force of different cross-sectional areas, so that the dynamic pressure The bearing supports and lubricates the rotating shaft with high rigidity, so that...

AI Technical Summary

Problems solved by technology

The lubricating oil between the rotating shaft and the bearing tends to leak toward the end of the bearing along the axial direction under various actions caused by the dynamic pressure effect (such as capillary action, pump action) and escape into the atmosphere, so that the dynamic pressure bearing is Insufficient lubricating oil prevents it from working normally, and finally causes the dynamic pressure bearing to fail; at the same time, when the shaft is assembled, when the shaft is squeezed into the inner hole of the dynamic pressure bearing, the air in the inner hole will be compressed to produce a huge reaction force , making it difficult to fill oil and assemble the shaft

The industry usually solves the problem of lubricating oil storage and leakage by setting up an oil storage tank on the inner peripheral surface of the dynamic pressure bearing. However, due to the miniaturization trend of the bearing, the inner diameter of the bearing is relatively reduced, and the hollow part of the bearing is relatively narrow. It is very difficult to store the oil tank, and it is difficult to improve the mass production and stability of the product

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