JPH03290890A - Structure of rotary body for magnetic disk device - Google Patents

Abstract

PURPOSE:To easily and securely correct the dynamic balance of a rotary body by providing a ring-shaped seal member to fit a groove to be attached and detached, and providing a housing part at the seal member to hold the balance weight for dynamic balance correction of the rotary body. CONSTITUTION:Ring-shaped grooves 14 are provided at a spindle hub 12 and a clamp ring 13, and ring-shaped seal members 15 are fitted to the grooves 14 so as to be attached and detached. On the other hand, the seal member 15 is equipped with a housing part 17 to hold a balance weight 16 for dynamic balance correction of a rotary body 11. When correcting the balance of the rotary body 11, the seal member 15 holding the prescribed weight of the balance weight 16 at the housing part 17 is fitted to the grooves 14 of the spindle hub 12 and the clamp ring 13 so that the balance weight 16 can be fixed at a certain position in a peripheral direction. Thus, the work of correcting the dynamic balance of the rotary body can be easily and securely executed.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to easily and reliably correct the dynamic balance of the rotating body with respect to the structure of a rotating body for a magnetic disk drive that supports and rotates a plurality of magnetic disks. In a rotating body for a magnetic disk device, in which a plurality of magnetic disks stacked at predetermined intervals are held between a spindle hub and a clamp ring, and the magnetic disks are mounted on a spindle, a side surface of the spindle hub and the clamp ring is provided. A ring-shaped groove is provided in the groove, and a ring-shaped sealing material is provided that is removably fitted into the groove, and the sealing material includes a storage part that holds a balance weight for correcting the dynamic balance of the rotating body. The configuration is such that

[Industrial application field]

The present invention relates to the structure of a rotating body for a magnetic disk device that rotates while supporting a plurality of magnetic disks.

In recent years, with the increase in speed and recording density of magnetic disk devices, there has been a demand for high-speed rotation and high performance of rotating bodies, and high-precision balancing of the rotating bodies has become necessary.

[Conventional technology]

As shown in FIG. 6, a conventional rotating body 1 for a magnetic disk device has a plurality of magnetic disks 100 stacked one on top of the other with a spacer 2 interposed between a spindle hub 3 and a clamp ring 4. ), and is configured to rotate by driving a spindle by a motor (not shown).
The second structure of the magnetic head for reading/writing information for 00 will be explained as follows with reference to FIG. 6.7.

The magnetic head 5 is attached above and below a support arm 7 that is rotatably supported by a pivot 6, and rotates in the direction shown by the arrow in FIG. 7 by the rotation of the support arm 7 driven by a voice coil motor 8. A seek operation is performed to read/write information to/from the opposing magnetic disk 100.

A conventional means for correcting the balance of the rotating body 1 is shown in FIG. 8-9. FIG. 8(a) is a front view showing the balance correction means;
FIG. 8(b) is a side view of the same, and FIG. 9 is an enlarged view of section A in FIG. 8(b). When correcting the balance, a lead plate 9 of a predetermined weight (size) is attached to a predetermined position of the clamp ring 4 using double-sided tape 10.

The adhesion position and weight of the lead plate 9 are determined by attaching the rotating body 1 to a balancing device and operating the device. Although FIG. 8.9 shows an example in which a lead plate is attached to the clamp ring 4, in reality, a lead plate is attached to the clamp ring and the spindle hub to correct the balance.

Further, after performing the - degree balance correction, the balance state is checked again, and if the unbalance amount is not within the target value, the balance is corrected again.

[Problem to be solved by the invention]

However, the conventional method described above has the following various problems.

(1) Since the adhesive is attached using double-sided tape, the adhesive force is weak and the lead plate will peel off.

(2) If the balance is to be corrected again, it is necessary to remove the residue of the double-sided tape after removing the lead plate and clean the parts.

(3) Workability is poor and automation is difficult.

(4) Lead plates cannot be reused.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure of a rotating body for a magnetic disk device that allows the dynamic balance of the rotating body to be easily and reliably corrected.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the principle of the present invention, and in the figure, reference numeral 11 indicates a rotating body for a magnetic disk device. Note that the same reference numerals are used for members that are common to the conventional one.

The rotating body 11 is constructed by sandwiching a plurality of magnetic disks 100 stacked one on top of the other with spacers 2 interposed between a spindle hub 12 and a clamp ring 13, and mounting the magnetic disks on a spindle (not shown).

A ring-shaped groove 14 is provided in the spindle hub 12 and the clamp ring 13, and a ring-shaped sealing material 15 is removably fitted into the groove 14. The sealing material 15 includes a balance weight 1 for correcting the dynamic balance of the rotating body 11.
A storage section 17 for holding 6 is provided.

[Function] When correcting the balance of the rotating body 11, the sealing material 15 holding the balance way 1-16 of a predetermined weight in the storage part 17 is placed in the groove 14 of the spindle hub 12 and the clamp ring 13, and the sealing material 15 is inserted into the balance way opening 6. are fitted so that they are located at predetermined positions in the circumferential direction. In this case, the weight and circumferential position of the balance weight 16 are determined by attaching the rotating body 1 to a balancing device and operating the device, as described above. In addition, balance weight 16
It is desirable to prepare a plurality of types and use them depending on the measurement results (unbalance amount) of the balancing device.

This balance correction work is extremely easy, and since the balance weight 16 is held by a sealing material, it is possible to solve the conventional problems (lead plates flying off and parts getting dirty with double-sided tape or adhesive). can.

Further, fine adjustment of the position of the balance weight 16 in the circumferential direction can also be performed by rotating the sealing material 15.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 2 to 5.

FIG. 2 is a side view of the rotating body 11 for a magnetic disk device of this example, where 21 is a spindle and 22 is a balance vibration table.

Note that the same reference numerals are used for the same members as in FIG. 1. The detailed shapes of the spindle hub 12 and the crumbling ring 13 are as shown in FIG. 3, which illustrates the crumbling ring 13. FIG. 3(a) is a front view showing a state in which a sealing material 15 made of an elastic material such as resin or rubber is fitted into the groove of the crumbling ring 13, and FIG.
3 is a side view showing how the sealing material 15 is fitted into the groove 14 of No. 3. FIG. As shown in FIG. 3(a), a plurality of holes 23 are provided on the surface of the sealing material 15, and the holes 23 are used for fine adjustment of the angle (position in the circumferential direction). FIG. 4 is an enlarged view showing a state in which the sealing material is fitted into part B of FIG. 3(b), and shows the storage section 17. The details of the shape of the balance weight 16 are clear from this figure.

When correcting the balance, measure the amount of unbalance in the state shown in Figure 2 and determine the position (angle) to be corrected.

Calculate the weight. Next, the balance is corrected by fitting the sealing material 15 holding the amount of balance weight 16 required for the correction into the spindle hub 12 and the groove 14 of the clamp spring. If there is a slight deviation in position, the sealing material 15
Correct by rotating. This correction work is easy (good workability), and since the balance weight 16 is held in the storage part 17 of the sealing material 15, centrifugal force is avoided.

It will no longer peel off due to wind pressure, etc.

FIG. 5 shows another embodiment.

In this example, the ring-shaped groove 32 of the crumbling ring 31
The sealing material 33 is fitted into the engaging portions 32a and 32b of the sealing material 33, and the double-sided tape 35
A thin plate 37 to which a balance weight 36 is bonded is held.

In the case of this example as well, the same effect as in the previous example can be obtained by preparing thin plates equipped with a plurality of types of balance weights.

〔Effect of the invention〕

As described above, according to the present invention, the following various effects can be obtained.

(1) Since the balance weight is held by a sealing material that fits into the grooves on the side surfaces of the spindle hub and crumbling, it will not fall off due to centrifugal force, wind pressure, etc.

(2) Balance correction is easy.

(3) Fine adjustment of the angle can be easily performed by rotating the sealing material.

(4) Since the balance weight is made as a component,
It can be used any number of times and is economically advantageous.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the principle of the present invention. FIG. 2 is a side view of a rotating body for a magnetic disk device according to an embodiment of the present invention. FIGS. Fig. 4 is an enlarged view showing a state in which the sealing material is fitted into part B of Fig. 3(b), Fig. 5 is an explanatory diagram of the main part structure of a rotating body according to another embodiment of the present invention, and Fig. 6 is FIG. 7 is an explanatory diagram of the structure of a conventional rotating body, FIG. 7 is an explanatory diagram of the operation of a magnetic head, FIGS. 8(a) and (b) are explanatory diagrams of conventional balance correction means, and FIG. This is an enlarged view of part A. In the figure, 11 is a rotating body for a magnetic disk drive, 12 is a spindle hub, 13 is a crumbling ring, 14 is a groove, 15 is a sealing material, 16 is a balance weight, 17 is a storage section, and 100 is a magnetism. It's a disc. uIi! Explanatory diagram of the principle of the air disc snow removal rotating body of the present invention Fig. 1 (a) (b) Fig. 3 4 An enlarged view showing the state in which the fj with a seal is fitted to part 8 in Fig. 3 Fig. 4 Fig. 5. Structure of a conventional rotating body. Fig. 6. Explanation of the operation of a magnetic head. Fig. 7. Figures (a) (b) Figure 8. AFgS enlarged view of Figure 8 (b). Figure 9.

Claims (1)

[Claims] A plurality of magnetic disks (one
00) to the spindle hub (12) and clamp ring (
13) and mounted on a spindle, the spindle hub (12) and the clamp ring (
13) is provided with a ring-shaped groove (14) on the side surface thereof, and is provided with a ring-shaped sealing material (15) that removably fits into the groove (14), and the sealing material (15) includes: A storage section (1) that holds a balance weight (16) for correcting the dynamic balance of the rotating body.
7) A structure of a rotating body for a magnetic disk device, characterized in that it is provided with: