JPH0823990B2 - Magnetic disk unit - Google Patents

Description

The present invention relates to a magnetic disk device having a structure in which a spindle and an actuator are fixed to a base, and a magnetic disk device which can be assembled with a small number of steps and which is assembled with high accuracy and has no shaft inclination. For that purpose, a spindle for holding and rotating the disc disc, an actuator for driving a head for reading / writing on the disc disc, a base for mounting and housing the spindle and the actuator, and a positioning bush for fixing the spindle to the base. , And a holding bush that fits into the positioning bush, a pair of fitting holes formed in the base to insert the positioning bush, and the holding bush that is fitted to both ends of the spindle. The pedestal provided in the fitting hole for temporary positioning and the actuator Positioning bush that fixes the actuator to the base, a holding bush that fits into the positioning bush, another pair of fitting holes provided in the base to insert the positioning bush for the actuator, and the actuator bush. And a pedestal 33 provided in a fitting hole for the actuator, which supports holding bushes fitted to both ends of the rotary shaft and temporarily positions the actuator.

The positioning of the spindle and the base is performed by fitting the fitting hole, the positioning bush and the holding bush. In addition, the actuator and the base are positioned by fitting between the fitting hole for the actuator, the positioning bush for the actuator, and the holding bush for the actuator.

[Industrial applications]

The present invention relates to a magnetic disk device having a structure in which a spindle and an actuator are fixed to a base.

In recent years, the demand for magnetic disk devices has been remarkably high, and since each company is trying to automate assembly and improve productivity, it is required to have a structure in which automatic devices such as robots can be assembled easily with high precision in the manufacturing process.

[Conventional technology]

Conventionally, there is a magnetic disk device as shown in FIG. 5, for example. FIG. 5 is a schematic diagram of a sealed type magnetic disk device.

In FIG. 5, reference numeral 1 is a base forming a housing, and a spindle 3 having a plurality of disc disks 2 fixed inside the housing is held by the base 1.
Is rotated by a motor (not shown) on the base 1. The spindle shaft 4 is fitted with bearings 5 and 6 at its upper and lower ends, and the bearings 5 and 6 are bushes 7 and 8.
It is fixed to the base 1 via. A head 9 for reading / writing information on the disc disc 2 is fixed to an actuator 11 via an arm 10 and is arranged so as to face the disc disc 2. Reference numeral 13 is a rotary shaft of the actuator 11. The upper and lower ends of the rotary shaft 13 are also fitted with bearings 25 and 26 similarly to the spindle, and the bearings 25 and 26 are bushes 23,
It is fixed to the base 1 via 24. 12 is the actuator
This is the VCM that drives 11.

FIG. 6 shows a detailed view of the spindle, and FIG. 7 shows a sectional view of the base, which is an XX section of FIG. 8 described later.

In FIG. 6, a disc disk 2 is laminated on a spindle 3 via a spacer 16, and the upper and lower sides thereof are fixed by a clamp 14. A motor 15 is provided inside the spindle 3, and bearings 5 and 6 are inserted into the upper and lower ends of a spindle shaft 4 that supports the spindle 3.

When the spindle 3 is mounted on the base 1 shown in FIG. 7, the claws 19 of the air hanging jig 17 are engaged with the grooves 18 provided in the clamp 14 and are suspended as shown in FIG. Take it to the fixed position. The bushes 7 and 8 are fitted into the bearings 5 and 6 from the outside, and temporary positioning is performed. Next, the bushes 7 and 8 are positioned with respect to the base 1 by a hole having a diameter common to the bushes 7 and 8 and the base 1.
After the jigs such as the pin 22 are applied to the pins 20 and 21, the bushes 7 and 8 are fixed with screws (not shown), and then the pin 22 is pulled out.

Also, when mounting the actuator 11 on the base,
(See FIGS. 5 and 8) As in the case of the spindle, although not shown, the actuator 11 (rotating shaft 13 for supporting the shaft 13
Hold the bearings 25 and 26 inserted in the upper and lower ends in a suspended state with a jig, and bring them to the position where they should be fixed to the base 1. From the outside to the bearings 25 and 26, bushes 23 and 24
To temporarily position the base 1 and bush 2
Positioning of 3 and 24 is performed using a jig such as a pin in a hole formed in the base 1 and the bushes 23 and 24 with the same diameter as in the case of the spindle.

[Problems to be Solved by the Invention]

When the spindle 3 and the actuator 11 are mounted on the base 1, the above-mentioned air-suspended jig 17 and positioning jig (pin 22) are required, which increases the number of assembly steps.

In addition, the accuracy of pin positions above and below the base 1 (left and right in FIG. 8) (since the pin holes 20 and 21 of the base 1 are not through holes but are opened separately, the position accuracy is not good) is not very good. The shafts (spindle shaft 4, rotary shaft 13) are tilted, which causes whirling and abnormal noise.

Therefore, it is an object of the present invention to provide a magnetic disk device that can be assembled with a small number of steps, can be assembled with high precision, and has no shaft inclination.

[Means for Solving the Problems] In order to achieve the above object, the present invention is directed to FIGS.
As shown in the figure, a spindle 3 for holding and rotating the disc disc 2, an actuator 11 for driving a head for reading / writing on the disc disc 2, and a spindle 3
And a base 1 for mounting and housing the actuator 11, and a positioning bush 28 for fixing the spindle 3 to the base 1,
And a holding bush 29 that fits into the positioning bush 28.
And a pair of fitting holes 27 formed in the base 1 for inserting the positioning bush 28 and the holding bushes 29 fitted at both ends of the spindle 3 to temporarily position the spindle 3. And a pedestal 35 provided in the dowel hole 27.

Furthermore, a positioning bush 31 that fixes the actuator 11 to the base 1, a holding bush 30 that fits into the positioning bush 31, and another pair provided on the base 1 to insert the positioning bush 31 for the actuator. Fitting hole 34 and a pedestal 33 provided in the fitting hole 34 for the actuator, which supports the holding bushes 30 fitted to both ends of the rotary shaft of the actuator 11 and temporarily positions the actuator 11. Prepare

The spindle 3 and the base 1 are positioned by fitting holes 27
And the positioning bush 28 and the holding bush 29 are fitted together.

Positioning of the actuator 11 and the base 1 is carried out by fitting holes 34 for the actuator, positioning bushes 31 for the actuator and holding bushes 30 for the actuator.
It will be configured by fitting with.

[Action]

In the present invention, the holding bush 29 (30) for holding the spindle 3 (actuator 11) is received and engaged with the pedestal 35 (33) for temporarily positioning the fitting hole 27 (34) of the base 1, and the spindle 3 The (arc actuator 11) is temporarily positioned on the base 1, and in that state, the positioning bush 28 (31) is engaged with the holding bush 29 (30) from the outside of the base 1 and screwed.

In this case, the fitting holes 27 (34) above and below the base 1
Can be machined at once with through holes, so the upper and lower fitting holes 27
The positions of (34) are aligned, and there is no center shift in the upper and lower fitting holes 27 (34).

Therefore, if the positioning bush 28 (31) is inserted into the fitting hole 27 (34), the spindle 3 (actuator 11) can be positioned with high precision, and the spindle 4
(Actuator 11) does not tilt. Further, since there is no need for the hanging work by the conventional hanging jig, the number of assembling steps is reduced.

〔Example〕

FIG. 1 is a diagram for explaining an embodiment of the present invention, FIG. 2 is a sectional view of a base of the present invention, FIG. 3 is an explanatory diagram of a mounting work of a spindle of the present invention, and FIG. 4 is a diagram of a spindle of the present invention. It is a mounting diagram.

1-3, 1 is a base for mounting the spindle 3 and the actuator, and the base 1 receives the holding bushes 29, 30 of the spindle 3 and the actuator 11, respectively, and pedestals 35, 33 for temporary positioning. Are provided (see FIG. 2), and the fitting holes 27 and 34 of the positioning bushes 28 and 31 on the upper and lower sides of the base 1 are used as through holes, and are processed at the same time from the same direction to obtain positional accuracy. Further, the positioning bushes 28 and 31 have protrusions, which engage with the recesses in the holding bushes 29 and 30, and they are fixed by screws 32.

A bearing 5 is fitted on the upper part of the spindle shaft 4, and a bearing 6 is fitted on the lower part thereof, and a holding bush 29 for holding the spindle 3 is fitted on the outer circumference of the bearings 5, 6.

Further, a bearing 25 is fitted to the upper part of the rotary shaft 13 of the actuator 11 and a bearing 26 is fitted to the lower part thereof, and the holding bush 3 holds the rotary shaft 13 on the outer circumference of the bearings 25 and 26.
0 is fitted.

When the spindle 3 is mounted on the base 1, a holding bush 29 attached to the spindle 3 from the inside of the base 1 is placed on the pedestal 35 of the fitting hole 27 of the base 1 for temporary positioning. Next, the positioning bush 28 is inserted from the outside into the fitting hole 27 of the base 1, the recess of the holding bush 29 and the protrusion of the positioning bush 28 are engaged to sandwich the base 1, and the positioning bush 28 is fixed with the screw 32. Retaining bush 29
When it is tightened, the positions of the spindle 3 and the base 1 are determined, and the mounting view of the spindle shown in FIG. 4 is obtained.

Also, when the rotary shaft 13 of the actuator 11 is mounted on the base 1, the holding bush 30 attached to the actuator 11 is placed on the pedestal 33 of the fitting hole 34 of the base 1, provisionally positioned, and positioned from the outside of the base 1. The bushing 31 is inserted into the fitting hole 34, and the holding bush 30 is tightened with a screw as in the case of the spindle 3 for positioning.

As described above, the provisional positioning pedestals 35 and 33 are provided in the fitting holes 27 and 34 of the base 1, and the holding bushes 29 and 30 of the spindle 3 and the actuator 11 and the positioning bushes 28 and 31 respectively serve as bases. By sandwiching 1 between them, the spindle 3 and the actuator 11 are positioned. Therefore, it is unnecessary to use a jig for suspending the spindle or the actuator in the air, or a positioning jig such as a pin as in the prior art. As a result, the number of assembling steps is reduced. Also, base 1
Since the fitting holes 27, 34 of the positioning bushes 28, 31 of are the through holes that can be processed at the same time and are processed accurately,
Accurate assembly, spindle 3, actuator 11
The fall of the wire is prevented and the reliability is improved. Further, with the above-mentioned configuration, it becomes a structure that an automatic device such as a robot can be assembled easily and systematically.

〔The invention's effect〕

As described above, according to the present invention, it is assembled accurately by sandwiching the base between the bush for holding the spindle and the actuator and the positioning bush,
The positioning of the base, the spindle and the actuator is improved in accuracy and reliability, and since a jig unlike the conventional one is not required, the number of steps can be reduced and the assembly can be performed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention, FIG. 2 is a sectional view of a base of the present invention, FIG. 3 is an explanatory diagram of a mounting work of a spindle of the present invention, and FIG. 4 is a diagram of a spindle of the present invention. Mounting diagram, FIG. 5 is a schematic diagram of a conventional magnetic disk device, FIG. 6 is a detailed view of the spindle of FIG. 5, FIG. 7 is a sectional view of the base of FIG. 5, and FIG. 8 is a conventional spindle mounting operation. FIG. In the figure, 1 is a base, 2 is a disc disk, 3 is a spindle, 4 is a spindle shaft, 5 and 6 are bearings, 11 is an actuator, 13 is a rotary shaft, 25 and 26 are bearings, 35 and 33 are pedestals, 27. , 34 are fitting holes, 28 and 31 are positioning bushes, 29 and 30 are holding bushes, and 32 is a screw.

Claims (1)

[Claims] 1. A spindle (3) for holding and rotating a disk disc (2), and a head for reading / writing the disk disc (2).
An actuator (11) for driving, a base (1) for mounting and accommodating the spindle (3) and the actuator (11), and a positioning bush (28) for fixing the spindle (3) to the base (1), And the positioning bush (28)
And a pair of fitting holes (27) formed in the base (1) for inserting the positioning bush (28), and both ends of the spindle (3). A pedestal (35) provided in the fitting hole (27) for supporting the fitted retaining bushes (29) and temporarily positioning the spindle (3).
A positioning bush (31) for fixing the actuator (11) to the base (1), a holding bush (30) fitted to the positioning bush (31), and a positioning bush for the actuator Another pair of fitting holes (34) provided in the base (1) for inserting the (31), and the holding bushes (34) fitted in both ends of the rotary shaft of the actuator (11). Positioning of the spindle (3) and the base (1) is provided with a pedestal (33) provided in a fitting hole (34) for the actuator for temporarily supporting the actuator (11) by supporting the actuator (11). Is performed by fitting the fitting hole (27) with the positioning bush (28) and the holding bush (29), and the actuator (11) and the base (1) are positioned with each other. , Fitting for the actuator Magnetic disk apparatus, wherein fit holes (34) and the positioning bushing for the actuator (31) and the retaining bushings for the actuator (30), that is intended to be performed by fitting.