JPH0680356U - Magnetic disk drive - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple structure, the fixed frame 11 and the bearing holder 12 are adhesively fitted with sufficient adhesive strength to stabilize the resonance point, which is an important design value for motor performance. ,
The perpendicularity of the bearing holder 12 with respect to the fixed frame 11 can be easily and accurately obtained. [Structure] A radial direction adhesive groove 13 and a thrust direction adhesive groove 14 are provided in a communicating state at a fitting portion between a fixed frame 11 and a bearing holder 12, and both adhesive grooves 13, 1 are provided.
By filling 4 with an adhesive, a strong fixing force is obtained in both radial and thrust directions, and
A structure in which the stator core 4 is directly brought into contact with the mounting body 11a of the fixed frame 11 so that not only the bearing holder 12 but also the stator core 4 can be mounted easily and accurately.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic disk drive device in which a magnetic disk is mounted on a rotatably supported hub and driven to rotate.

[0002]

[Prior art]

 A magnetic disk drive having a structure as shown in FIG. 6, for example, is generally known. In the figure, first, a hollow cylindrical bearing holder 2 is fitted on a flat plate-shaped fixed frame 1 and is erected so as to be in a right angle state. That is, in the fitting portion between the fixed frame 1 and the bearing holder 2, as shown in FIG. 7, the lower end of the bearing holder 2 is fitted into the mounting hole 1a provided on the fixed frame 1 side. The fixed cylinder 2a provided in the above portion is fitted and inserted in a press-fitted state or an insertion-bonded state, and the fixed flange portion 2b provided so as to bulge toward the bearing holder 2 side is fixed to the fixed frame 1 It is in axial contact with the opening edge of the mounting hole 1a. As described above, the fitting portion between the fixed frame 1 and the bearing holder 2 has a radial fitting surface and a thrust fitting surface that come into contact with each other in the radial direction and the thrust direction.

Further, in this fitting portion, a fixed groove 2a of the bearing holder 2 is provided with an adhesive groove 3 having a predetermined width formed in an annular shape, and the adhesive filled in the adhesive groove 3 fixes the fixed frame. 1 and the bearing holder 2 are fixed. As described above, the adhesive groove 3 in the conventional device is provided only on the radial fitting surface, and the thrust fitting surface is merely in abutting relationship.

On the other hand, an iron core 4 having a laminated structure is fitted around the outer periphery of the bearing holder 2 just above the fitting portion between the fixed frame 1 and the bearing holder 2. The coil 5 is wound. Further, a pair of bearings 6 and 6 are fixed inside the bearing holder 2 so as to be parallel to each other in the axial direction, and a rotary shaft 7 is rotatably supported by the both bearings 6 and 6. The outer ring 6a and the inner ring 6b of each bearing 6 are adhered and fixed to the inner peripheral wall of the bearing holder 2 and the outer peripheral surface of the rotary shaft 7, respectively.

Further, a cylindrical hub 8 is integrally provided at a tip end portion of the rotary shaft 7 on the upper side in the drawing, and the rotary shaft 7 and the hub 8 are integrally rotationally driven. Has been done. A magnetic disk (not shown) is attached to the outer periphery of the body portion 8a of the hub 8. On the other hand, a disk-shaped mounting plate 8b extends outward in the radial direction from the lower end edge of the body portion 8a of the hub 8 shown in the drawing. A character-shaped back yoke 9 is annularly joined. The drive magnet 10 is annularly fixed to the inner wall surface of the back yoke 9 by adhesion. The inner peripheral surface of the drive magnet 10 is arranged so as to face the outer peripheral surface of the iron core 4.

[0006]

[Problems to be solved by the device]

 When the fixed frame 1 and the bearing holder 2 are fixed to each other by a fitting portion having a slight length in the magnetic disk drive having such a structure as described above, the joint strength between the fixed frame 1 and the bearing holder 2 is increased. There is a problem that it is difficult to do enough. That is, in the above-mentioned conventional device, the adhesive strength between the fixed frame 1 and the bearing holder 2 is weak and the adhesive strength varies widely, which causes variations in the resonance point, which is an important design value for motor performance. There is. Further, there is a problem that the perpendicularity between the fixed frame 1 and the bearing holder 2 cannot be sufficiently obtained.

Therefore, an object of the present invention is to provide a magnetic disk drive device having a simple structure and capable of favorably fixing a fixed frame and a bearing holder.

[0008]

Means for Solving the Problems To achieve the above object, a magnetic disk drive device according to a first invention comprises a fixed frame, a bearing holder fitted to the fixed frame, and a rotation in the bearing holder. A hub that rotates integrally with a freely supported rotation shaft to rotate and drive a magnetic disk, wherein the fitting portion between the fixed frame and the bearing holder has a radial direction and a thrust direction. It has a radial mating surface and a thrust mating surface that come into contact with each other in two directions, and the adhesive for filling the adhesive on each of the radial mating surface and the thrust mating surface. A groove is provided, and the adhesive grooves provided on the fitting surfaces communicate with each other.

In addition to the structure of the first invention, a magnetic disk drive device according to a second invention is a mounting cylinder that projects axially so as to form a thrust direction fitting surface on the fixed frame side. And a stator core around which a coil is wound is brought into contact with the end surface of the mounting barrel of the fixed frame.

[0010]

[Action]

 According to the means according to the first aspect of the invention, the fitting portion between the fixed frame and the bearing holder is thrust by the adhesive groove for filling the adhesive, which is provided on both fitting surfaces in the thrust direction and the radial direction. Since it is firmly fixed in both the radial and radial directions, the fixed frame and the bearing holder are bonded together with sufficient adhesive strength, and the perpendicularity of the bearing holder with respect to the fixed frame can be accurately obtained. Has become.

According to the means of the second invention, in addition to the operation of the means of the first invention, the fitting length of the fixed frame and the bearing holder is extended by the mounting barrel of the fixed frame, The squareness of the fitting of the two is made more accurate, and the stator core directly contacts the mounting barrel of the fixed frame, so that not only the bearing holder but also the stator core can be mounted easily and accurately. .

[0012]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, the overall structure of the magnetic disk drive apparatus according to the first embodiment of the present invention shown in FIGS. 1 and 2 is substantially the same as that shown in FIG. Will be described. The magnetic disk drive device according to the present invention differs from the conventional device in the fitting structure of the fixed frame and the bearing holder and the structure of the adhesive groove provided in the fitting portion.

That is, as shown in FIGS. 1 and 2, at a fixed position of the flat plate-shaped fixed frame 11, there is provided a hollow cylindrical mounting cylinder 11 a that projects a predetermined amount in the axial direction (upward direction in the drawing). A fixed cylinder 12a, which is provided on the lower end side of the bearing holder 12 in the drawing, is press-fitted and inserted into the inside of the mounting barrel 11a. A radial fitting surface is formed on the fitting portion formed by the press-fit fitting. Further, the lower end surface in the axial direction of the radial bulging portion 12b provided on the bearing holder 12 side is in contact with the protruding tip surface 11b of the mounting barrel 11a in the fixed frame 11, and by the contact. A fitting surface in the thrust direction is formed on the fitting portion.

Further, an adhesive is applied to each of the radial direction fitting surface and the thrust direction fitting surface forming the fitting portion between the mounting body 11a of the fixed frame 11 and the radial bulging portion 12b of the bearing holder 12. A radial direction adhesive groove 13 and a thrust direction adhesive groove 14 are respectively provided for filling the above. The radial direction attachment groove 13 and the thrust direction adhesion groove 14 in this embodiment are annularly recessed so as to scrape off a part of the bearing holder 12 over a predetermined width. The two adhesive grooves 13 and 14 are communicated with each other at their root portions, so that the overall cross-sectional shape is substantially L-shaped.

Further, the center side of the stator core 4 is directly abutted on the protruding end surface 11b of the mounting body 11a which constitutes the thrust direction fitting surface on the fixed frame 1 side. That is, the protruding tip surface 11b of the mounting body 11a is formed to have a diameter slightly larger than that of the radial bulging portion 12b of the bearing holder 12, and is located on the protruding portion on the outer peripheral side to the center side of the stator core 4. The parts are abutted so as to be placed.

As described above, in the first embodiment, the fitting portion between the fixed frame 11 and the bearing holder 12 is provided with adhesive grooves 13 for filling the adhesive, which are provided on both fitting surfaces in the radial direction and the thrust direction. It is firmly fixed in both the radial direction and the thrust direction by 14 so that the fixed frame 11 and the bearing holder 12 are adhesively fitted to each other with sufficient adhesive strength, and at the same time, the bearing holder for the fixed frame 11 is fixed. 12 squareness can be accurately obtained.

Further, the fitting length of the fixed frame 11 and the bearing holder 12 is extended as compared with the conventional case by the mounting barrel 11a of the fixed frame 11 which constitutes the thrust direction fitting surface in the fitting portion of the fixed frame 11 and the bearing holder 12. Therefore, the fitting perpendicularity between the fixed frame 11 and the bearing holder 12 is made more accurate. In addition, in the above embodiment, since the stator core 4 is directly abutted on the mounting body 11a of the fixed frame 11, not only the bearing holder 12 but also the stator core 4 is easily and accurately mounted. .

Further, in the second embodiment shown in FIG. 3 in which the same components as those in the first embodiment are represented by the same reference numerals, the radial direction adhesive groove 23 and the thrust direction adhesive groove 24 are fixed frames. The mounting body 11a of 11 has a ring-shaped recess so as to scrape away a part thereof. Even with such a configuration, it is possible to obtain substantially the same actions and effects as those of the above embodiment.

Further, in the third embodiment shown in FIG. 4, the radial direction adhesive groove 33 and the thrust direction adhesive groove are provided without providing the mounting case 11a of the fixed frame 11 as in the above-mentioned respective embodiments. 34 are provided. That is, in the fitting structure of the fixed frame 1 and the bearing holder 2 similar to the conventional structure shown in FIGS. 6 and 7, the radial direction adhesive groove 33 and the thrust direction adhesive groove 34 are communicated with each other on the bearing holder 2 side. It is recessed. Even with such a configuration, the fitting portion between the fixed frame 1 and the bearing holder 2 is in a strong adhesive fitting state, and it is possible to obtain substantially the same actions and effects as those of the above-described embodiments.

The invention made by the present inventor has been specifically described based on the embodiments, but the invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the gist of the invention. Needless to say. For example, in the fourth embodiment shown in FIG. 5, the adhesive groove in the embodiment of FIG. 3 described above is provided on the fixed frame 1 side, and the radial adhesive groove 43 and the thrust adhesive groove 44 are provided. Are recessed on the fixed frame 1 side so as to communicate with each other. The fixed barrel 12a may be press-fitted into the frame 11 or may be simply inserted and adhered without press-fitting.

[0021]

[Effect of device]

 As described above, in the magnetic disk drive device according to the first invention, the radial direction adhesive groove and the thrust direction adhesive groove are provided in the fitting portion between the fixed frame and the bearing holder so as to communicate with each other. By filling the groove with adhesive, a strong fixing force is obtained in both the radial direction and the thrust direction.Therefore, the fixed frame and the bearing holder are adhesively fitted with sufficient adhesive strength, The resonance point, which is an important design value for motor performance, can be stabilized, and the perpendicularity of the bearing holder with respect to the fixed frame can be obtained easily and accurately, thus improving the reliability of the magnetic disk drive. Can be improved.

In addition to the configuration of the first invention, the magnetic disk drive device according to the second invention allows the stator core to directly abut on the mounting barrel of the fixed frame to facilitate not only the bearing holder but also the stator core. In addition to the effect of the first device, the device can be assembled more easily and accurately because it is configured to be mounted accurately.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic disk drive device according to a first embodiment of the present invention.

FIG. 2 is a partial lateral cross-sectional view showing an enlarged part A in FIG.

3 is a cross-sectional view of a magnetic disk drive device according to a second embodiment of the present invention, which corresponds to FIG.

FIG. 4 is a cross-sectional view of a magnetic disk drive device according to a third embodiment of the present invention, which corresponds to FIG.

5 is a cross-sectional view of a magnetic disk drive device according to a fourth embodiment of the present invention, which corresponds to FIG.

FIG. 6 is a transverse cross-sectional view showing an example of a conventional magnetic disk drive device.

FIG. 7 is a partial horizontal cross-sectional view showing an enlarged part B in FIG.

[Explanation of symbols]

 11 Fixed frame 11a Mounting barrel 12 Bearing holder 12a Fixed cylinder 13,23,33,43 Radial direction adhesive groove 14,24,34,44 Thrust direction adhesive groove

Claims (2)

[Scope of utility model registration request] 1. A fixed frame, a bearing holder fitted in the fixed frame, and a hub for rotating a magnetic disk by rotating integrally with a rotary shaft rotatably supported in the bearing holder. Wherein, the fitting portion between the fixed frame and the bearing holder has a radial fitting surface and a thrust fitting surface that abut in two directions of a radial direction and a thrust direction, Each of the radial direction mating surface and the thrust direction mating surface is provided with an adhesive groove for filling an adhesive, and the adhesive grooves provided on each of the mating surfaces communicate with each other. And a magnetic disk drive device. 2. The magnetic disk drive device according to claim 1, wherein a mounting barrel projecting in the axial direction so as to form a thrust direction fitting surface is provided on the fixed frame side, and an end surface of the mounting barrel of the fixed frame. A magnetic disk drive device in which a stator core around which a coil is wound is in contact with.