JP2806895B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a magnetic disk drive, and more particularly to a bearing unit structure.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, a method of fixing an arm and a bearing unit is generally a bonding method, a ring method or a screw fixing method. In the most frequently used screw fixing method, a screw is generally provided on a sleeve integrated with the bearing unit.

[0003]

In the above-mentioned screw fixing method, when a through hole is provided in a sleeve of a bearing unit and a screw is inserted, dust generated by friction between the screw and the through hole is formed inside the bearing unit. Break in,
This has led to the occurrence of bearing loosening and shortened bearing life.

[0004] In order to avoid the above-mentioned problem, when the structure is such that the screw does not penetrate, there has been a problem that a cleaning solution or the like remains in the screw hole. Further, in this case, the thickness of the sleeve must be made sufficiently large, and accordingly, there is a disadvantage that the moment of inertia when the arm moves increases and the durability is poor.

[0005] This problem can be solved to some extent by sealing the screw of the sleeve against the bearing itself, but the roundness of the sleeve is increased because the bearing insertion portion becomes the screw portion again. Need to be processed. However, in actual processing, it is difficult to achieve roundness, and considerable attention is required because burrs generated by screw processing remain in the threaded portion.
Further, in this case, the screw cannot be screwed at the center of the two bearings, so that the vibration is biased to one side, which is a problem in the vibration characteristics.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a magnetic disk drive having a highly reliable bearing unit structure for fixing an arm and a bearing unit in a magnetic disk drive.

[0007]

SUMMARY OF THE INVENTION The above-mentioned problem is caused by the fact that the magnetic disk drive according to the present invention, that is, the bearing unit comprises a shaft provided at the center thereof, a bearing provided around the shaft, and a bearing unit. , And a sleeve provided around the bearing and the spacer. The arm and the sleeve are provided with through holes, one screw is passed through each through hole, and the screw contacts the spacer. This can be achieved by a magnetic disk device that fixes the arm.

At this time, the spacer comes into contact with the inner peripheral surface of the sleeve. Further, the spacer is formed by another member other than the bearing. As a result, when the screw penetrates the arm and the sleeve and comes into contact with the sleeve, it is sufficient that the screw is sealed. Further, for more reliable sealing, the spacer is formed of a material having elasticity.

The bearing unit structure for a magnetic disk according to the present invention has means for sealing a screw passing through a sleeve with a spacer. Therefore, it is possible to prevent dust generated by rubbing of the screw when fixing the arm and the bearing unit from entering the inside of the bearing unit. Further, since the screw type is used before assembling the bearing unit, a cleaning liquid or the like does not remain in the through hole, and sufficient cleaning can be performed.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of an example of a general magnetic disk drive. The magnetic disk drive includes a spindle motor 2 attached to a base 1 and a spindle motor 2
And a magnetic head 4 for recording and reproducing information on and from the magnetic disk 3
A suspension 5 for applying and holding a predetermined weight to the magnetic head 4, an arm 6 for holding the suspension 5, a bearing unit 7 for making the arm 6 rotatable, and driving the arm 6 A voice coil motor 8 for positioning the magnetic head 4 at a designated cylinder on the magnetic disk 3, and a cover 9 for sealing these components from outside air by fitting them to the base 1.
And a printed circuit board 10 on which an electronic circuit for controlling the operation of each unit is mounted.

FIG. 2 is a plan view (A) and a side view (B) showing an actuator bearing structure of one embodiment of the magnetic disk drive of the present invention. In FIG. 2A, a screw 11 is inserted from the side of the arm 6, passes through the arm 6, penetrates the sleeve 74, and is sealed by a spacer 75 provided on the bearing 72. Here, the sleeve 74, the bearings 72 and 73, and the spacer 75 are collectively called a bearing unit. FIG.
(B) is a side view seen from the direction of the screw 11. The screw 11 may be a + screw, a − screw, or a hexagonal screw.

FIG. 3 is a sectional view showing an actuator bearing structure of one embodiment of the magnetic disk drive according to the present invention, and shows a cross section taken along line XX of FIG. Bearing unit 7
Is a sleeve 74 provided with a through hole 77 for receiving the screw 11 for fixing the shaft 71, the bearings 72 and 73, and the arm 6, and one side of the screw 11 (the inner peripheral surface side of the sleeve).
Is constituted by a spacer 75 for sealing the substrate. The bearing unit and the arm 6 form an actuator bearing structure. The screw 11 penetrates a through hole 76 provided in the arm 6, passes through a through hole 77 of the spacer 74, abuts on a spacer 75 provided on the bearing 73, and is sealed. If a screw is attached while the spacer is in contact with the inner peripheral surface of the sleeve, the sealing becomes more reliable. The spacer 75 is formed of another member other than the bearing 73. Further, the material of the sleeve 75 can be formed of a material having elasticity, such as a synthetic resin.

FIG. 4 is a sectional view showing details of a sleeve portion of an actuator bearing structure according to an embodiment of the magnetic disk drive of the present invention. Through hole 7 in the side of sleeve 74
7, and the through hole 77 is closed by a spacer 75 provided on the inner peripheral surface side of the sleeve 74. The spacer 75 is for sealing the screw 11 and is made of a material having elasticity, which is a different material from the bearings 72 and 73. The arm 6 is attached so as to sandwich the sleeve 74 from the outside of the sleeve 74 thus formed.

[0015]

According to the magnetic disk of the present invention, it is possible to prevent dust generated by rubbing of screws when fixing the arm and the bearing unit from entering the inside of the bearing unit. Before assembling the bearing unit,
Because of the screw type, sufficient cleaning can be performed without leaving a cleaning liquid or the like inside the through hole, and a highly reliable magnetic disk device can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a general magnetic disk drive.

FIGS. 2A and 2B are diagrams showing an actuator bearing structure of one embodiment of the magnetic disk drive of the present invention, wherein FIG. 2A is a plan view and FIG.

FIG. 3 is a sectional view showing an actuator bearing structure of one embodiment of the magnetic disk drive of the present invention, and FIG.
It is XX sectional drawing of (A).

FIG. 4 is a sectional view showing details of a sleeve portion of the actuator bearing structure of the magnetic disk drive according to one embodiment of the present invention.

[Explanation of symbols]

 1 Base 2 Spindle Motor 3 Magnetic Disk 4 Magnetic Head 5 Suspension 6 Arm 7 Bearing Unit 8 Voice Coil Motor 9 Cover 10 Printed Circuit Board 11 Screw 71 Shaft 72, 73 Bearing 74 Sleeve 75 Spacer 76 Through Hole 77 Through Hole

Claims (5)

(57) [Claims] 1. A magnetic disk, a spindle motor for rotating the magnetic disk, a magnetic head for recording or reproducing information on the magnetic disk, a suspension for holding the magnetic head, and holding the suspension A magnetic disk drive comprising an arm for rotating the arm and a bearing unit that allows the arm to rotate, wherein the bearing unit includes a shaft provided at the center thereof, a bearing provided around the shaft, and the bearing And a sleeve provided around the bearing and the spacer, a through hole is provided in each of the arm and the sleeve, and a screw is passed through each of the through holes. The screw comes into contact with the spacer, Magnetic disk device for fixing the over arm. 2. The magnetic disk drive according to claim 1, wherein the spacer is in contact with an inner peripheral surface of the sleeve. 3. The apparatus according to claim 1, wherein the spacer is formed by another member other than the bearing.
Or the magnetic disk device according to 2. 4. The magnetic disk drive according to claim 1, wherein said screw is sealed when penetrating said arm and said sleeve and abutting on said sleeve. . 5. The magnetic disk drive according to claim 1, wherein said spacer is formed of a material having elasticity.