CN100363123C

CN100363123C - Tool for manufacturing fluid bearing

Info

Publication number: CN100363123C
Application number: CNB2004100774899A
Authority: CN
Inventors: 施文章; 林焕超; 黄晋兴; 洪健隆; 白先声
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2004-12-10
Filing date: 2004-12-10
Publication date: 2008-01-23
Anticipated expiration: 2024-12-10
Also published as: CN1785546A

Abstract

The present invention relates to a tool for manufacturing a fluid bearing. The present invention comprises a guiding element which can rotatablely move in a shaft hole of a bearing along the axial direction of the bearing, wherein the guiding element comprises a guiding end, and the guiding element is integrally provided with a plurality of shaping convex parts which squeeze the inner surface of the bearing so as to form slots along the circumferential direction on the outer surface approaching to the guiding end. The tool for manufacturing a fluid bearing of the present invention only needs to ensure the accuracy of the guiding element, and therefore, the present invention has the advantages of simple manufacturing process and high accuracy.

Description

Tool for manufacturing fluid bearing

[technical field]

The present invention relates to a kind of fabrication tool of FDB, refer to a kind of fabrication tool of on FDB, processing groove especially.

[background technology]

Present stage, wearing and tearing and reduction noise for reducing the revolution part increase the service life, and FDB is applied in fan motor and the hard disk drive more and more.

Be illustrated in figure 4 as the Hydrodynamic bearing device schematic diagram, comprise a bearing 3 and rotatably be contained in the bearing 3, and bearing 3 between have the rotating shaft 5 of certain interval, the inner surface of this bearing 3 is provided with groove 3A, stores lubricating fluid in this gap.At bearing 3 during with rotating shaft 5 relative runnings, thereby the lubricating fluid between bearing 3 and the rotating shaft 5 directly contact rotating shaft 5 because the effect of groove 3A produces 5 rotations of certain pressure supporting revolving shaft with bearing 3 in the process of rotation, thereby reduces to wear and tear.

Be illustrated in figure 5 as the fabrication tool of known FDB groove, this fabrication tool is to adopt the mode of hard sphere extruding to form groove on bearing inner surface.This fabrication tool comprises guide bar 14, and this guide bar 14 is provided with radially a through hole 142, is filled with hard spheroid 15 in this through hole 142, and the spheroids 15 in this through hole 142 are slightly larger than the internal diameter of bearing 3 along this guide bar 14 height radially.

During the running of this fabrication tool, the guide end of guide bar 14 enters in the axis hole of bearing 3, advance along axis hole along this guide bar 14 axial linear velocity V with one, and be the angular speed W rotation of rotating shaft with one with guide bar 14 axis simultaneously.When the herringbone groove 3A that produces as shown in Figure 4, guide bar 14 rotates while moving along its axis, when the spheroid on the guide bar 14 15 advances to the centre position of bearing 3, its spheroid 15 pushes the identical partial groove of direction that forms groove 3A on the inner surface of bearing 3, change the direction of rotation of guide bar 14 then, be the big or small constant of angular speed W, direction is opposite, keep the size and the direction of linear velocity V of guide bar 14 constant simultaneously, and then be processed to form this bearing 3 groove 3A with second half relative groove of above-mentioned half part direction, thereby form as shown in Figure 4 herringbone groove 3A at bearing 3 inner surfaces.

Because groove 3A is because the inner surface of spheroid 15 extruding bearings 3 forms, therefore just require this fabrication tool to have high out of roundness and concentricity for the pinpoint accuracy that reaches groove 3A, promptly not only each spheroid 15 will reach high out of roundness, also requires all spheroids 15 to have the concentricity of height.But because each spheroid 15 is to make separately to be assembled on the guide bar 14 again, when producing this fabrication tool, the pinpoint accuracy when not only requiring each spheroid 15 to produce also requires its pinpoint accuracy in assembling for this reason, makes and makes very difficulty of this fabrication tool.In view of above reason, hope can provide the tool for manufacturing fluid bearing that a kind of processing procedure is simple and accuracy is high.

[summary of the invention]

Technical problem to be solved by this invention provides the fabrication tool of the simple FDB of a kind of processing procedure.

For solving technical problem of the present invention, tool for manufacturing fluid bearing of the present invention, comprise one rotatably along bearing shaft to the guide member that in the bearing axis hole, moves, this guide member comprises a guide end, this guide member is being provided with two flanges near interval on the outer surface of guide end, form an annular groove between this two flange, this guide end along the circumferential direction is provided with some projections integratedly in the annular groove place, thereby the top of each projection forms the moulding projection that the extruding bearing inner surface forms groove.

Because tool for manufacturing fluid bearing of the present invention is as long as guarantee the accuracy of guide member, processing procedure is simple, the accuracy height.

[description of drawings]

Fig. 1 is a tool for manufacturing fluid bearing schematic diagram of the present invention.

Fig. 2 is the cutaway view of tool for manufacturing fluid bearing of the present invention along the II-II line.

Fig. 3 is tool for manufacturing fluid bearing of the present invention and related elements cutaway view.

Fig. 4 is known Hydrodynamic bearing device cutaway view.

Fig. 5 is known tool for manufacturing fluid bearing cutaway view.

[specific embodiment]

Below in conjunction with accompanying drawing tool for manufacturing fluid bearing of the present invention is further described.

As shown in Figure 1 to Figure 3, tool for manufacturing fluid bearing 20 of the present invention is used for being processed to form groove 52 at the inner surface of bearing 50.

Fabrication tool 20 comprises a guide member 21, and this guide member 21 comprises a guide end 22 and a link 23 relative with this guide end 22, and this link 23 is connected in a drive unit.During this fabrication tool work, it is rotating shaft rotational angular W along the linear velocity V of its axially-movable and with its axis that this drive unit provides this guide member 21.

Guide member 21 is being near being provided with two flanges 24 on the outer surface of guide end 22, and this be provided with at interval along the axis direction of this guide member 21, thereby this is to forming an annular groove 240 between the flange 24 to flange 24 all ringwise.

Each flange 24 and these guide member 21 concentric settings, the external diameter of flange 24 is equal to or slightly less than the diameter of bearing 50 axis holes, and when the guide end 22 of guide member 21 entered in the axis hole of bearing 50, guide member 21 can not damage the inner surface of bearing 50.

As shown in Figure 2, annular groove 240 places of this guide member 21 are provided with four projections 25 integratedly, on the same circumference that is arranged at this guide member 21 of described projection 25 interval symmetries, each projection 25 comprises an arc-shaped outer surface, the height of projection 25 is identical with the height of flange 24, so form the circumference of an and equal diameters concentric with flange 24 along each projection 25 of axially seeing of this guide member 21.Be appreciated that ground, the quantity of projection 25 is not limit, can be greater or less than four.

Each projection 25 top is outward extended with a moulding projection 26, each moulding projection 26 comprises that one is connected in the top of the root and a processing groove 52 at projection 25 tops, the top of each moulding projection 26 constitutes a circumference concentric with guide member 21, the height of described moulding projection 26 is identical with the degree of depth of the groove of required processing 52, be the diameter of the diameter of each projection 26 formed circumference, thereby form groove 52 at the inner surface that adds described moulding projection 26 extruding bearings 50 in man-hour greater than the axis hole of bearing 50.Described moulding projection 26 can process by methods such as discharge processing or ultrasonic wave processing.

When these fabrication tool 20 work, at first the guide end 22 of guide member 21 is inserted in the axis hole of bearing 50, this guide member 21 advances with linear velocity V along the axis hole of bearing 52 then, axis with this guide member 21 is that rotating shaft is rotated with angular speed W simultaneously, thereby the inner surface of the moulding of this guide member 21 projection 26 extruding bearings 50 forms groove 52 on the inner surface of bearing 52.The chip that is produced in process to annular groove 240 places, makes process more smooth and easy along the arc-shaped outer surface landing of projection 25.

In the foregoing description, moulding projection 26 is arranged on the guide member 21 integratedly, therefore can satisfy the requirement to the accuracy of whole fabrication tool 20 as long as guarantee the accuracy of guide member 21 during fabrication, and processing procedure is simple, the accuracy height.

Claims

1. tool for manufacturing fluid bearing, comprise one rotatably along bearing shaft to the guide member that in the bearing axis hole, moves, this guide member comprises a guide end, it is characterized in that: this guide member is being provided with two flanges near interval on the outer surface of guide end, form an annular groove between this two flange, this guide end is provided with some projections integratedly in the annular groove place, thereby the top of each projection forms the moulding projection that the extruding bearing inner surface forms groove.

2. tool for manufacturing fluid bearing as claimed in claim 1 is characterized in that: the top of described moulding projection be positioned at the concentric circumference of guide member on.

3. tool for manufacturing fluid bearing as claimed in claim 1 is characterized in that: each projection comprises a curved surfaces.

4. tool for manufacturing fluid bearing as claimed in claim 1 is characterized in that: the external diameter of each flange is identical with the diameter of bearing axis hole.

5. tool for manufacturing fluid bearing as claimed in claim 4 is characterized in that: the external diameter of described flange and the equal diameters of circumference that projection forms.