JPS62279578A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the workability of attaching and prevent generation of screw scraps to improve the quality and the mass productivity by tightening an attaching screw from the side of one face of a base in a spindle motor hub part to fix a stepping motor. CONSTITUTION:Attaching screws 3 are engaged with tapped holes 13 through holes 22 of an attaching flange part 21 to fix a spindle motor 2 positioned to an attaching part 11 of a base 1. After holes 44 and 44 are allowed to coincide with tapped holes 42 and 42 of engaging parts 41 and 41, attaching screws 45 and 45 are inserted from the side of one face S1 of the base and are engaged with parts 41 and 41 to fix a stepping motor 4 positioned to an attaching part 12. Consequently, screws 3..., 45 and 45 are tightened in the same direction as an arrow A from the side of the face S1 to improve the workability of attaching, and screw scraps or the like have no bad influences upon a hub part 20 to improve the mass productivity and the quality.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a magnetic disk device, and particularly to a magnetic disk device with an improved mounting structure for a stepping motor and a spindle motor to a base. be.

[Conventional technology]

Figure 4 shows, for example, rNrKKEx ELECTRONI.
C8 February 25, 1985 issue" (published by Nikkei McGraw-Hill), page 185, is a schematic plan view showing the conventional borosilicate device. In the figure, 1 is a mounting base, and 2 is this base 1. spindle motor mounted on,
3 is this spindle motor 2? 4 is a stepping motor attached to the base 1 adjacent to the spindle motor 2; 5 is a mounting screw for attaching the stepping motor 4 to the base 1; The magnetic disk drive configured in this way has two motors attached to the base 1 shown in FIG. A mounting portion 11, a stepping motor mounting portion 12, and a plurality of screw holes 13, 14, .
14 are provided.

Next, the process of attaching two motors to the base 1 will be explained. With respect to the base 1 having the structure shown in FIG. 6, the spindle motor 2 has a hub portion 20 protruding to one side and a mounting collar portion 21 as shown in FIG. It is positioned from one side indicated by the reference numeral S1 in FIG. 5, and fixed from the same side S1 to the other side S2 (in the direction of arrow A) using mounting screws 3. Furthermore, due to structural problems, the stepping motor 4 is positioned from one side S1 to which the spindle motor 2 is attached, and from the other side S2.
Fix from the other surface S2 side to the first surface S1 side (in the direction of arrow B) using the K mounting screws 5, 5.

As mentioned above, the reason why the spindle motor 2 and the stepping motor 4 are mounted in different directions is based on the following reasons. In other words, a magnetic disk device is a device with built-in components that must be assembled in an extremely clean atmosphere with a cleanliness level of, for example, 100 or higher.
．． There is a risk that the presence of dust of 3 μm or larger may cause trouble with the operation of the device after assembly, so please take these precautions. : One of the required parts is the hub portion 20 of the spindle motor 2. Also, the spindle motor 2 of the base 1
There are problems with strength due to the fact that the peripheral edge of the mounting part 11 is thin, and the above-mentioned screw 3 near the hub part 20...
Base 1 from the viewpoint of preventing the generation of screw chips due to screwing
The spindle motor 2 is installed from one side S1 side.

On the other hand, in the stepping motor 4, although there is a risk of the generation of screw chips etc. on the one surface S1 side of the base 1, a larger scale of dust generation due to the installation work is caused on the hub part of the spindle motor 2.
It is attached from the other side S2 of the base 1 so as not to have an adverse effect on the base 1 (and to avoid work that requires attention).

[Problem that the invention seeks to solve]

Since the conventional magnetic disk device is configured as described above, the screw tightening direction (arrow A) of the mounting screws 3 of the spindle motor 2 and the screw tightening direction of the mounting screws 5 of the stepping motor 4 are different. (arrow B) is different, so
The workability of attaching both motors 2゜4 to the base 1 is extremely poor, and if the work is to be automated, it is necessary to provide a reversing mechanism to reverse the base, or to install screwdrivers on both sides of the base. In either case, there is a problem in that the cost increases due to an increase in the number of manufacturing facilities. In addition, during screw tightening work, the mounting screws 5, 5 and the screw hole 14.14 come into contact with each other, causing the two to rub and generate screw chips, but the screw hole 14.14 remains highly clean even after the stepping motor 4 has been installed. The spindle motor 2 is exposed on the hub section 20 side, and there is a risk that the remaining screws and other debris generated during screw tightening work will always have an adverse effect on the hub section 20. There were also problems.

In order to solve the above-mentioned problems, this invention
P (1) The hub part of the spindle motor should protrude from one side of the base to the other side, and the spindle motor and stepping motor should be By firmly tightening each mounting screw and fixing it to the base, it improves the workability of mounting the spindle motor and stepping motor to the base, and there is no risk of dust affecting the spindle motor hub even after installation. The purpose is to obtain a magnetic disk device.

[Means for solving problems]

In the magnetic disk drive according to the present invention, both motors are positioned from the surfaces facing the spindle motor mounting portion and the stepping motor mounting portion of the base, respectively, and the two motors are mounted in the same direction from the hub portion side of the spindle motor. It is fixed with screws.

[For production]

By applying the mother air disk device in this invention in an automatic assembly process that can suppress the generation of screw waste,
One side of the base from which the hub of the spindle motor protrudes,
Attach both the stepping motor and spindle motor using the mounting screws from the spindle motor mounting surface.

At this time, the stepping motor mounting screw is screwed into the screw hole with the stepping motor mounting portion of the base sandwiched between the screw head and the threaded portion of the stepping motor. Therefore, in the part where the stepping motor and the base are fixed, the threaded part of the mounting screw cannot be screwed into the mounting hole of the base, which is a blank hole, and moreover, the threaded part of the mounting screw cannot be screwed into the mounting hole of the base, which is a blank hole. On the other hand, since the threaded portion of the stepping motor and the mounting screw are screwed together on the other side, there is no chance of screw chips or the like being generated or entering the one side where the hub portion is located.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the plan views, sectional front views, and exploded perspective views shown in FIGS. 4 to 3, the same reference numerals as in FIGS. 4 to 6 indicate the same or corresponding parts, and redundant explanation will be omitted. In the figure,
Reference numeral 41 indicates a threaded portion formed diagonally oppositely through the shaft of the stepping motor 4, 42.42 indicates a threaded hole drilled and threaded in this threaded portion 41, and 44.44 indicates this threaded hole 42. A blank hole 45.45 is formed in the base 1 corresponding to .42, and a mounting screw 45 is used to fix the stepping motor 4 to the base 1.

The assembly process of the magnetic disk device having the above configuration will be explained mainly with reference to FIG. The spindle motor 2 is positioned on the spindle motor mounting portion 11 of the base 1 from one side S1 of the base as shown by arrow A, and is fitted with mounting screws 3 through holes 22 formed in the mounting flange 21. It is fixed to the base 1 by being screwed into the screw hole 13. Next, the stepping motor 4
is positioned from the other surface S2 side of the base 1 on the stepping motor mounting part 12 as shown by arrow B, and is connected to the screw hole 44, 44 of the base 1 and the screw hole 4 of the threaded part 41, 41 of the motor.
2.42, one side of base 1 511tl
The stepping motor 4 is fixed to the base 1 by screwing the mounting screws 45, 45 through the threaded portions 41, 41 of the motor.

Therefore, both the mounting screws 3 . . . and the mounting screws 45, 45 are tightened in the same direction as the arrow A from the one surface S1 side of the base 1.

In the above embodiment, the mounting flange 21 of the spindle motor 2 is described as having the blank holes 22, but the mounting flange 21 is formed with screw holes. Even if there is a screw, the screw tightening work can be performed from the hub side, and the same effect can be achieved.

In addition, the screw holes 42 and 42 are formed in the threaded portion 41 and 41 of the stepping motor 4.
The same effect as in the above embodiment can be obtained even if a hole is also bored in the screwed part and the stepping motor mounting part of the base and the screwed part of the stepping motor are clamped and fixed with bolts and nuts serving as mounting screws. Effective performance.

〔Effect of the invention〕

As described above, according to the present invention, the stepping motor mounting screw extends from one side of the base on the side where the hub portion of the spindle motor is located to the other side.

Tighten the screws: Since the stepping motor is fixed to the base, there is no possibility that thread debris between the stepping motor mounting screws and the base screw holes will have a negative impact on the spindle motor hub, which requires an extremely clean environment. This eliminates the risk and improves the workability of attaching the stemming motor and spindle motor to the base.For example, it becomes a mechanism suitable for the adoption of automatic assembly machines, improving mass production, and also prevents screw scraps from being removed from the spindle motor. By preventing this occurrence on the hub side, a magnetic disk device with superior quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is based on the line ■-■ shown in FIG.
3 is an exploded perspective view showing the assembly process, and FIGS. 4 to 6 are plan views showing a conventional magnetic disk device, a sectional front view cut along the V-V line, and a pace processing. FIG. In the figure, 1 is the base, 2 is the spindle motor, 3 is the spindle motor mounting screw, 4 is the stepping motor, 11 is the spindle motor mounting part of the base, 12 is also the stepping motor mounting part, 20 is the hub part of the spindle motor, 41 is the threaded part of the stepping motor, 42
44 is a hole in the base, and 45 is a stepping motor mounting screw. In the figures, the same reference numerals indicate the same or corresponding parts. Patent Applicant Mitsubishi Electric Co., Ltd. Agent Patent Attorney 1) Hiroshi Sawa (2 others) Figure 1 Go to 1 "-S 3 Nispin 9 T- Stainless steel attached σ 41 = Scale and"/ MORA 4: FU 190 FU 45: Zute γ PING E
-η Flooding screw 20 varnish O Knoll motor heart Fig. 4

Claims (2)

[Claims] (1) A mounting base in which a stepping motor mounting part and a spindle motor mounting part are provided adjacent to each other, a stepping motor fixed to the stepping motor mounting part from one side of the base with a mounting screw, and the spindle motor In a magnetic disk drive having a spindle motor fixed to the mounting part from the other side of the base by a mounting screw and having a hub part protruding from the center, the stepping motor and the spindle motor are respectively positioned in both the motor mounting parts. . A magnetic disk drive, wherein the spindle motor is fixed by the mounting screw from one side of the base toward the other side from which the hub portion protrudes. (2) The stepping motor is in contact with the other side of the spindle motor mounting surface of the base, and is fixed to the base by a mounting screw from the mounting surface side through a hole bored in the base. The magnetic disk device according to item 1.