JPH0322666B2 - - Google Patents

Description

Detailed Description of the Invention <Technical Field> The present invention relates to a magnetic disk device having a structure in which a disk spindle is supported on both sides by a pair of bearings installed in the base and cover of a disk enclosure, and the present invention relates to a magnetic disk device having a structure in which a disk spindle is supported on both sides by a pair of bearings installed in a base and a cover of a disk enclosure. This can be done safely, and the spindle can be rotated with high precision even when the cover is not installed during assembly.

<Prior art> A spindle to which a magnetic disk is attached is
A conventional example of a magnetic disk device of the type that is supported on both sides by a bearing mounted on a base and a bearing mounted on a cover will be described with reference to FIG. As shown in the figure, the spindle 1 is configured to be supported on both sides by a base-side ball bearing 4 and a cover-side ball bearing 5, which are supported by a base 2 and a cover 3, respectively. Therefore, when the base 2 and cover 3 are separated when assembling the magnetic disk 6 and positioner 7 or attaching them to the servo writer, the cover-side ball bearing 5 is released from the restraint of the cover 3 while remaining attached to the spindle 1. The spindle 1 is cantilever-supported only by the base-side ball bearing 4, and cannot stand on its own and tilts freely. As a result, there is a risk of damage to the base side ball bearing 4 and damage to the surface of the magnetic disk due to contact between the magnetic disk 6 and the head arm 8.

In order to prevent such accidents, conventionally, when the cover 3 is separated, the spindle 1 is temporarily fixed using a self-supporting support member to stand upright. However, this method has the disadvantage that the spindle 1 cannot be rotated during the temporary fixation.

<Object of the Invention> In view of the above-mentioned prior art, an object of the present invention is to provide a magnetic disk device in which the spindle can rotate independently with high precision and high rigidity even when the cover is separated.

<Structure of the Invention> The structure of the present invention that achieves the above object is that a spindle on which a magnetic disk is mounted is provided with a base-side bearing installed on a base, and a cover installed on the base so as to cover the magnetic disk and spindle. In a type of magnetic disk device that is supported on both sides by a cover-side bearing, when the spindle is not supported by the cover-side bearing, the inner ring fits into the base-side end of the spindle, and the outer ring The present invention is characterized in that the spindle is pivotally supported by a spindle self-supporting bearing supported by a bearing housing that is removably attached to the base.

<Examples> Examples of the present invention will be described in detail below based on the drawings. Note that parts that are the same as those in the prior art are designated by the same numbers, and redundant explanations will be omitted.

FIG. 2 is a sectional view showing an embodiment of the magnetic disk device according to the present invention, in which the spindle 1 has a hub 9.
is fixed. Magnetic disks 6 and clamp rings 10 are alternately stacked on the hub 9, and are tightened and integrated with a disk clamp 11. A motor rotor 12 for driving the spindle is fixed to the spindle 1, and a motor stator 13 is attached to the base 2.
installed on. An inner ring of a spindle self-supporting bearing 14 is fitted into the base side end of the spindle 1 with high precision. The outer ring of the spindle self-supporting bearing 14 is fitted into a bearing housing 15, and the bearing housing 15 is detachably supported by the base 2.

With this structure, the spindle 1 stands on its own with high precision and high rigidity even when the cover 3 is separated, that is, when the magnetic disks 6 are stacked or when the positioner 7 is mounted. Furthermore, by using bearings to support the spindle's independence, the spindle 1 can rotate with high precision even if the cover 3 is separated, and the balance of the rotating body can be balanced and the reference plane of the hub 9 can be maintained as it is. This will improve the efficiency of self-grinding and servo light operations.

After all the work is completed and the base 2 and cover 3 are connected, the outer ring of the spindle self-supporting bearing 14 is released from the bearing housing 15, and the spindle self-supporting bearing 14 is attached to the third As shown in the figure, it is fixed to the spindle 1 or removed from the spindle 1, and another seal plate 16 is mounted to form a disk enclosure. Note that when the cover 3 is removed for repair or the like after completion, the seal plate 16 is removed and the bearing housing 15 is attached in its place to hold the self-supporting bearing 14. Then remove cover 3. By doing so, the independence of the spindle 1 can be ensured.

<Effects of the Invention> As described above based on the embodiments shown in the drawings, according to the magnetic disk device of the present invention, the spindle can stand on its own with high precision and high rigidity even when the cover is not installed. Therefore, there is an advantage that the workability during stacking of magnetic disk plates is good and that the magnetic disk surfaces and bearings are not damaged. Furthermore, since it can be constructed with high rotation accuracy, there is an advantage that balancing, self-grinding, and servo writing can be performed while the cover is separated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the components of a conventional magnetic disk device, FIG. 2 is a cross-sectional view showing an embodiment of the present invention in a state in the middle of assembly, and FIG. 3 is a cross-sectional view showing the assembled embodiment. It is. In the drawings, 1 is a spindle, 2 is a base, 3 is a cover, 4 is a ball bearing on the base side, 5 is a ball bearing on the cover side, 6 is a magnetic disk, 7 is a positioner, 8 is a head arm, 9 is a hub, and 10 is a clamp ring. ,
11 is a disk clamp, 12 is a motor rotor,
13 is a motor stator, 14 is a bearing for supporting the spindle, 15 is a bearing housing, and 16 is a seal plate.

Claims (1)

[Scope of Claims] 1. A spindle on which a magnetic disk is mounted is supported by a base-side bearing installed on a base and a cover-side bearing held by a cover attached to the base so as to cover the magnetic disk and spindle. In a magnetic disk device of the holding type, the spindle has a self-supporting bearing, the inner ring of which fits into the base-side end of the spindle, and the outer ring of which is supported by a bearing housing that is removably attached to the base. A magnetic disk device characterized by: