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Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same

A technology of a fluid bearing and a manufacturing method, which is applied to sliding contact bearings, bearings in rotary motion, bearings, etc., can solve the problem that the impact resistance cannot be satisfied, the tightening force of the shaft 34 and the rotor hub 32 is reduced, and the welding fumes are easy to enter the screw. holes, etc., to achieve the effect of suppressing scattering

Active Publication Date: 2006-09-13
PHC HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the spindle motor is limited, the protruding length L of the upper end portion 34a of the shaft 34 (refer to Figure 14 (b)) If it is too large, the fastening force between the shaft 34 and the rotor hub 32 will decrease, and the impact resistance performance cannot be satisfied. Therefore, it is preferable to shorten the length L as much as possible.
However, if the length L is shortened, welding fume will easily enter the screw hole 43
In addition, since the occurrence of microcracks cannot be avoided, it has the same problem as the first method

Method used

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  • Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same
  • Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same
  • Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0139] Below, refer to Figure 1 to Figure 5 , the spindle motor 100 using the bearing device 101 which is the dynamic pressure fluid bearing of this embodiment will be described.

[0140] [Configuration of Spindle Motor 100 ]

[0141] The spindle motor 100 is mainly composed of stationary parts and rotating parts.

[0142] So-called stationary parts, for example, such as figure 1Shown are a base plate 1 , a stator core 2 , a coil 3 , an insulating tube 4 , a first flange member 6 , a shaft 7 , a second flange member 9 , and a cylindrical wall portion 16 . The bottom plate 1 is made of aluminum alloy or the like. The stator core 2 is made of a silicon steel plate or the like, and a stator core assembly is formed by winding a coil 3 made of a copper-based metal or the like. The stator core assembly is fixed to the base plate 1 by press fitting or the like. One end of the insulating tube 4 is inserted into the coil lead wire, and the other end is drawn out to the outside o...

Embodiment approach 2

[0194] refer to Figure 10 ~ Figure 12 , the spindle motor 200 of this embodiment will be described.

[0195] Figure 10 is a sectional view of the spindle motor 200 .

[0196] exist Figure 10 Among them, the housing 51 has a cylindrical portion 51a at the center, and the boss 52 is attached to the cylindrical portion 51a. The shaft 53 is rotatably inserted into the bearing hole 52 a of the sleeve 52 . A flange 55 is attached to the lower end of the shaft 53 . The opening at the lower end of the bushing 52 is sealed by a thrust plate 54 . Fluids such as oil are filled between the shaft 53 and the sleeve 52, and between the thrust plate 54 and the flange 55, forming a well-known dynamic pressure fluid bearing in this technical field.

[0197] In this embodiment, aluminum casting or iron material is used for the casing 51 . As the bushing 52, a brass material (copper alloy) plated with nickel is used. A stainless steel material (for example, SUS420J2) is used for the sh...

other Embodiment approach

[0209] (A)

[0210] In the above Embodiment 1, with Figure 4 As an example, an example in which the vicinity of the boundary line between the shaft 7 and the second flange member 9 is laser welded in order to fix the second flange member 9 on the shaft 7 will be described. At this time, the shape of the second flange member 9 is not limited to this, either. For example, if Figure 6 As shown in (a), the second flange member may have a concave portion on the inner peripheral side of the upper end surface in the axial direction, and laser welding may be performed near the boundary between the bottom surface of the concave portion 5 and the shaft 7 .

[0211] As an effect of the recessed portion 5, there are effects of preventing warping of the second flange member 9 formed by welding and preventing scattering of foreign matter.

[0212] if press Figure 4 In the welding shown in the configuration, a load is applied in a direction in which the upper end surface of the second...

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Abstract

The invention relates to a dynamic liquid bearing which can confirm axial space needed in working, and relative production, and main axle motor, wherein said bearing (101) at least comprises axle (7), an axle sleeve (8) rotationally relative to the axle (7), the first cam element (6) fixed on the axle (7), and the second cam element (9) fixed on the axle (7). In addition, said production comprises: 1, sheathing axle sleeve (8) on the axle (7); inserting second cam element (9) into axle (7); 2, pushing the axial upper end of second cam element (9); 3, holding said pushing operation, welding axle (7) and the second cam element (9), to fix the second cam element (9) on the axle (7).

Description

technical field [0001] The present invention relates to a dynamic pressure fluid bearing used in a spindle motor and a manufacturing method thereof, a spindle motor and a manufacturing method thereof. Background technique [0002] In recent years, a fluid bearing motor capable of achieving low NRRO or low noise through non-contact rotation has been adopted as a spindle motor mounted on a disk drive such as a hard disk drive (hereinafter referred to as HDD). [0003] Regarding the motor structure of this fluid bearing motor, the conventional dynamic pressure fluid bearing (for example, refer to Patent Document 1), such as Figure 9 As shown, it is composed of a shaft 103, a tapered portion 106, a shaft sleeve 112, and a tapered bearing pad back 108, and the parts on the side of the shaft 103 are screwed. In this example, a tapered portion 106 having the same taper is fitted to a shaft 103 having a tapered portion 104 serving both as a radial bearing and a thrust bearing, and ...

Claims

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Application Information

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IPC IPC(8): F16C17/10H02K21/12
Inventor 前川和宪吉川洋生戒能直司中村纯一白井彰人
Owner PHC HLDG CORP
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