JPH0213169B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of this application relates to a fluid bearing equipped with a dynamic pressure generating mechanism and a manufacturing method thereof. In particular, the present invention relates to a shaft in which a groove for generating dynamic pressure is formed and a method for forming the groove in the shaft.

Mass production technology for the grooves of hydrodynamic bearings equipped with a conventional dynamic pressure generation mechanism has not yet been established. They were manufactured by etching or grinding the metal shaft of a hydrodynamic bearing, or by using rolling and plating techniques.

However, etching or grinding to form grooves of a predetermined shape and depth on the curved surface of the bearing shaft requires time and effort and is not easy.

In addition, in order to reduce friction and wear due to metal contact between related parts when the dynamic pressure generation mechanism starts and stops, a method has also been adopted in which ceramics, etc. are thermally sprayed on the surface of the bearing shaft and then polished. ,
Defects such as complicated work may occur.

FIG. 1 attached below illustrates a hydrodynamic bearing equipped with a conventional dynamic pressure generating mechanism. A bearing shaft 2 is rotatably fitted into a cylindrical groove 3 formed inside the bearing 1, and a groove group 4 is formed on the outer periphery of this shaft. When fluid moves within the cylindrical groove 3 at a predetermined speed, dynamic pressure is generated by the pumping action of the fluid by the groove group 4 of the shaft.

When forming the groove group 4 on the outer periphery of the shaft 2, it is necessary to use etching as described above and go through a complicated process. The invention of this application has been devised to overcome the above-mentioned deficiencies, and first, embodiments thereof will be explained based on the accompanying drawings FIGS. 2, 3, and 4.

A parcel group 6 having a predetermined shape, for example, a herringbone shape, is formed on the thin metal plate 5 by etching or press punching. A thin metal plate 5 with such a groove is embedded in a groove 7 carved at an appropriate depth on the outer periphery of the end of the bearing shaft 2, and the upper surface is covered with Teflon 8 or a polymeric material with a small coefficient of friction. If a thin coating process is performed using a metal plate or the like, the uneven portion 9 corresponding to the thickness of the metal plate 5 and the parcel groove portion 6 will be formed.

The uneven portion 9 formed by such a method has a constant depth and a predetermined shape, and forms a groove portion with extremely high precision.

Further, as described above, without forming the groove 7 on the outer periphery of the bearing shaft 2, the thin metal plate 5 with the Purcell groove 6 punched out is directly wrapped around the surface of the bearing shaft and temporarily fixed, and then the upper surface is coated with Teflon or the like. You can also.

If the groove surface is coated as described above, it is possible to reduce friction and wear caused by metal contact between related members when the dynamic pressure generating mechanism is started or stopped.

Furthermore, instead of the metal thin plate 5, a synthetic resin thin plate such as plastic may be used.

In the conventional technology, it was difficult to accurately form a groove pattern on a curved surface while considering the groove depth, but in the present invention, the groove part that is essential for generating dynamic pressure is formed into an expanded plane (flat plate). Since it can be replaced by punching, it can be formed extremely easily on the outer periphery of the bearing shaft.At the same time, the groove can be formed on the upper surface of the groove using a polymer material with a small coefficient of friction, such as Teflon, or a thin film coating, which can prevent contact between parts during startup and stop. Friction and wear can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a fluid bearing equipped with a conventional dynamic pressure generation mechanism. FIG. 2 is a plan view of a thin plate with a herringbone Purcell groove carved therein according to the present invention. Third
The figure is a side view showing a part of a shaft in which the Purcell groove of FIG. 2 is installed on the outer periphery of both ends and a coating is applied thereon. FIG. 4 is an enlarged view of the end face of FIG. 3. 1...Bearing, 2...Shaft, 3...Bearing groove,
5...Thin plate member, 6...Purzel groove, 8...Thin film coating, 9...Irregular portion.

Claims (1)

[Scope of Claims] 1. Another thin plate member having a dynamic pressure generating groove formed in a predetermined shape and depth is attached to the outer periphery of the bearing shaft, and its upper surface is coated with a polymeric material having a small coefficient of friction. A fluid bearing equipped with a dynamic pressure generation mechanism. 2. A step of forming a dynamic pressure generating groove of a predetermined shape in a thin plate member by etching or press working, a step of mounting the member on the outer periphery of a bearing shaft, and a step of coating the upper surface of the thin plate member with a thin film of a polymeric material having a small coefficient of friction. A method for manufacturing a hydrodynamic bearing equipped with a dynamic pressure generation mechanism, which comprises a process of: 3. A fluid bearing equipped with a dynamic pressure generating mechanism according to claim 1, in which a herringbone Purcell groove is carved into a thin plate member. 4. A method for manufacturing a fluid bearing equipped with a dynamic pressure generating mechanism according to claim 2, which comprises the step of forming a herringbone parcel groove in a thin plate member. 5. A fluid bearing equipped with a dynamic pressure generating mechanism or a method for manufacturing the same according to claim 1 or 2, wherein the thin plate member is a metal plate or plastic. 6. Claim 1, in which a groove is provided on the outer periphery of the bearing shaft for embedding and mounting the thin plate member.
A fluid bearing equipped with a dynamic pressure generation mechanism as described in . 7. A hydrodynamic bearing equipped with a dynamic pressure generating mechanism according to claim 2, which includes the step of forming a groove for mounting the thin plate member on the outer periphery of the bearing shaft before mounting the thin plate member on the bearing shaft. manufacturing method.