JPH04281282A - Method for assembling rotary disk - Google Patents

Abstract

PURPOSE:To eliminate the unevenness of rotation and vibration at the time of rotation, with regard to a method for assembling of a rotary disk fixing plural disks and plural spacers while superposing successively. CONSTITUTION:On the flange 7 of a rotating spindle 6, plural disks 8 and plural ring like spacers 9, 9-1 engaging with the spindle 6 are superposed alternately. Then, plural disks 8 and plural spacers 9, 9-1 are pressurized to be moved alternately on one side from the opposite directions of the order of respective superposing. Thereafter, plural disks 8 and plural spacers 9, 9-1 are constituted so as to be pushed to be fixed to the flange 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a rotating disk, in which a plurality of disks and a plurality of spacers are stacked and fixed in sequence.

0002

2. Description of the Related Art FIG. 5 is a partially cutaway side view of a magnetic disk assembly. In FIG. 5, a fixed shaft 2 around which an electromagnetic coil 1 is wound has a pair of bearings 3.
, 4, a rotating spindle 6 with an electromagnetic coil 5
Attach. A flange 7 is provided at the bottom of the spindle 6, and on the flange 7, eight magnetic disks (discs) 8 and a ring-shaped spacer 9 are stacked. It is fixed toward the flange 7 by a disk 10 attached with screws. In the figure, 11 and 12 are bearings 3,
4 is a seal to prevent dust from entering, 13 is a fixed flange, and 14 is a spacer sandwiched between the uppermost magnetic disk 8 and the disc 10.

[0003] Generally, the spindle 6 has a rotation speed of 3600 rpm.
The magnetic disk 8 rotates at a high speed of about
rotates with. A magnetic head that magnetically records on the magnetic disk 8 and reads magnetic recording from the magnetic disk 8 approaches the rotating magnetic disk 8 . Therefore, it is necessary that the magnetic disk 8 has no uneven rotation and no vibration.

Therefore, for example, the outer diameter of the spindle 6 to which the magnetic disk 8 and spacer 9 fit is set to -0.05 to -.
When a tolerance of 0.02 mm is given, the tolerance of the hole diameter of the magnetic disk 8 that fits into the spindle 6 is ±0 to +0.05 m.
m, and the inner diameter tolerance of the spacer 9 is +0.0
5 to +0.1 mm, and the eccentricity of the magnetic disk 8 and spacer 9 is suppressed by these tolerances.

[0005]

[Problem to be solved by the invention] As explained above,
The conventional magnetic disk assembly (disc assembly) is
Eccentricity of the magnetic disk 8 and spacer 9, which are related to uneven rotation and vibration, is suppressed by the tolerance of the fitting dimensions. but,
It is inevitable that gaps will occur in matings where "tight fit" cannot be applied, and in conventional magnetic disk assemblies, the positions of the maximum values of these gaps will be different.
The center of gravity shifts from the center of rotation, causing uneven rotation and vibration.

FIG. 6 is an explanatory diagram of the shift in the center of gravity in a conventional magnetic disk assembly. In FIG. 6, the spindle 6 and the magnetic disk 8, the spindle 6 and the spacer 9
The position of the maximum gap in the fitting tolerance range varies at different positions. Therefore, the central axis of rotation 1
5 and a straight line 16 passing through the center of gravity and parallel to the central axis 15, a deviation δ occurs, and when the dynamic balance during rotation is measured, it is 20 to 3
0g. The imbalance in mm is measured. Such unbalance causes uneven rotation of the spindle 6, causing vibration, and also shortens the life of the bearings 3 and 4.

[0007]

[Means for Solving the Problems] According to an embodiment of the method of the present invention aimed at eliminating the above-mentioned unbalance, as shown in FIG.
A plurality of disks (magnetic disks) 8 and a plurality of ring-shaped spacers 9, 9-1 are stacked alternately, and the plurality of disks 8 and the plurality of spacers 9, 9-1 are stacked toward the spindle 6. 1 are pressed against each other alternately in the stacking order with a pressing force F from the opposite direction, and then the plurality of disks 8 and the plurality of spacers 9, 9-1 are pressed against the flange 7 and fixed. This is a method of assembling a rotating disk characterized by the following.

[0008]

[Operation] According to the above means, the fitting gap between the rotating spindle and the disk and the fitting gap between the rotating spindle and the spacer are distributed to the left and right in the diametrical direction of the rotating spindle, and the center of gravity of the disk assembly is located at the rotating spindle. It almost overlaps with the center axis of rotation. As a result, uneven rotation and vibration of the rotating spindle are significantly reduced compared to those assembled using conventional methods.

[0009]

[Example] Figure 1 is an explanatory diagram of an example of the method of the present invention, and Figure 2
3 is a perspective view schematically showing a magnetic disk and spacer shifting device used in the method of the present invention, and FIG. 4 is an illustration of another embodiment of the method of the present invention. It is an explanatory diagram.

FIG. 1 using the same reference numerals for parts common to FIG. 5
As shown in (A), a plurality of magnetic disks 8 and a plurality of spacers 9, 9-1 are fitted into the spindle 6.
are stacked alternately on the flange 7. At that point, the fitting gaps between the spindle 6 and the magnetic disk 8, and between the spindle 6 and the spacers 9 and 9-1, have different maximum gap positions, and are parallel to the center axis 15 of rotation and the center of gravity passing through the center axis 15. It does not coincide with straight line 16.

Next, as shown in FIG. 1(b), 2 from the top
, 4th, 6th, and 8th magnetic disks 8 and 2nd and 4th from the top
, the sixth spacer 9 or 9-1 is pressed against the spindle 6 by a pressing force F from the left, and the first, third, fifth, and seventh magnetic disks 8 from the top and the first,
The third, fifth, and seventh spacers 9 are pressed against the spindle 6 by a pressing force F from the right direction.

The results are as shown in FIG. 1(C).
, 4th, 6th spacer 9 or 9-1 and spindle 6
The gap is zero on the left side and maximum on the right side, and the gap between the 1st, 3rd, 5th, and 7th magnetic disk 8 from the top
, 3rd, 5th, and 7th spacers 9 and the spindle 6 are zero on the right side and maximum on the left side.

Such magnetic disk assembly 2
In No. 1, there are a total of eight magnetic disks 8, and the gaps are shifted by separating the four disks to the left and right, so that the dynamic balance is even. However, the total number of spacers 9 and 9-1 is seven, and while there are three spacers for right alignment, there are four for left alignment. Therefore, in order to equalize the dynamic balance of the spacers 9 and 9-1, the spacer 9-1 at the center in the height direction is formed to have twice the weight of the other spacers 9. The dynamic balance is maintained evenly.

Magnetic disk 8 and spacer 9, 9-1
When the biasing is completed, the disk 10 is fixed to the spindle 6, and the magnetic disk 8 and spacers 9, 9-1 are fixed between the flange 7 and the disk 10, completing the assembly of the magnetic disk assembly 15. do.

Such magnetic disk 8 and spacer 9,
9-1, even when there is a maximum gap at the top of the figure as shown in Figure 2 (a), the pressing force F from the right direction is
, the gap between the spindle 6 and the spacers 9, 9-1 (or the magnetic disk 8) becomes zero on the side where the pressing force F is applied, as shown in Figure 2 (b), and on the opposite side (left side) Maximum.

In FIG. 3, a magnetic disk/spacer shifting device 21 fixes a magnetic disk assembly mounting plate 23 to a base 22, and moves a pair of magnetic disk assembly mounting plates 23 along a guide rail 24 provided on one side of the base 22. The holder 25 slides in the left and right direction. A plurality of arms 26 for pressing the magnetic disk 8 and a plurality of arms 27 for pressing the spacer 9 are attached to the pair of holders 25 . The magnetic disk assembly 15 is fixed to the mounting plate 23, and the pair of holders 25 are attached to the device 2.
1, each arm 26 and 2
7 is the opposing magnetic disk 8 or spacer 9, 9-
1 (not shown) toward the spindle 6, and press the magnetic disk 8 and spacers 9, 9-1 shown in FIG.
Perform the one-sided shift.

In FIG. 4, the magnetic disk assembly 31 has seven magnetic disks 8 and six spacers 9, similar to those of the magnetic disk assembly 15.
This configuration is attached to a spindle 6. However, the pressing force F
The number of magnetic disks 8 and spacers 9 shifted to the right by the force F is three, and the number of magnetic disks 8 shifted to the left by the pressing force F is four, while the number of spacers 9 shifted to the left by the force F is three. Therefore, the magnetic disk 8 shifted to the left is one larger than the magnetic disk 8 shifted to the right, and the imbalance of the center of gravity caused by this causes the spacer 9-1 located at the center in the height direction and shifted to the right.
It is heavier and covers more than other spacers 9.

It should be noted that by the method of the present invention, the magnetic disk 8
and a magnetic disk with spacers 9, 9-1 shifted to one side.
Assemblies 15, 31 have a dynamic imbalance of 5 to 10 g. It will be about mm. However, with one shift, the dynamic imbalance is 10g. mm or more, and such magnetic disk assemblies 15, 31 may have a diameter of 5 to 10
g. It can be kept within mm.

[0019]

Effects of the Invention According to the method of the present invention, the center of gravity of the magnetic disk assembly almost overlaps with its rotation center axis, and the dynamic unbalance during rotation is measured to be 5 to 10.
g. mm, which is 1/3 of that assembled using the conventional method.
It becomes below. Therefore, uneven rotation and vibration are reduced,
This has the effect of extending the life of the bearing that supports the rotating spindle.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the method of the present invention.

FIG. 2 is an explanatory diagram of the magnetic disk and spacer shifting in the method of the present invention.

FIG. 3 is a perspective view schematically showing an apparatus used in the method of the present invention.

FIG. 4 is an explanatory diagram of another embodiment of the method of the present invention.

FIG. 5 is a partially cutaway side view of the magnetic disk assembly.

FIG. 6 is an explanatory diagram of center-of-gravity shift in a conventional magnetic disk assembly.

[Explanation of symbols]

6 is a rotating spindle 7 is the flange of the rotating spindle 8 is a magnetic disk (disc) 9, 9-1 is a ring-shaped spacer 10 is a disk for fixing the magnetic disk

Claims (2)

[Claims] [Claim 1] Flange of rotating spindle (6) (
7) includes a plurality of discs (8) that fit into the spindle (6) and a plurality of ring-shaped spacers (9, 9-1).
Stack them alternately and point them toward the spindle (6).
The plurality of discs (8) and the plurality of spacers (9)
, 9-1) are pressed alternately from opposite directions in the stacking order to bring them together, and then the plurality of discs (8) and the plurality of spacers (9, 9-1) are stacked together. A method for assembling a rotating disk characterized by pressing and fixing it against a flange (7). 2. When there is an odd number of discs (8) or an odd number of spacers (9, 9-1), one of the spacers (9-1) is replaced by another spacer (
9) It is characterized by making the disc (8) or the spacer (9, 9-1) heavier, and compensating for the unbalance caused by the fractional number of the disks (8) or the spacers (9, 9-1) by shifting the one spacer (9-1) to one side. A method for assembling a rotating disk according to claim 1.