JPH07326124A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To provide a magnetic disk device which can be made small and thin and enhance reliability and at the same time facilitate the maintenance of a driving motor by driving the rotation of a disk inside an enclosure by an external motor. CONSTITUTION:A magnetic disk 12, a magnetic head 15, a magnetic head driving part 16 and the like are hermetically contained in a disk enclosure 3. The rotation of the disk 12 is driven by a hub shaft 7, a hub 10 and the like which are rotated by an external motor 18 and the like through a belt 21, a pulley 17 and the like. The driving motor is provided outside the enclosure, thereby being able to provide a magnetic disk device which can be made small and thin and enhance reliability and at the same time facilitate the maintenance of the driving motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device for rotationally driving various magnetic disks.

[0002]

2. Description of the Related Art As a magnetic disk device for rotationally driving a magnetic disk such as a hard disk, a structure disclosed in, for example, US Pat. No. 4,900,958 is known. . As shown in FIG. 2, this magnetic disk device has a disk enclosure 33 including a top cover 31 and a bottom cover 32.
The motor 48 is arranged inside.

The motor 48 rotates via a shaft 37, a stator core 35 fixed to the outer peripheral surface of the shaft 37 and around which a drive coil 34 is wound, and a pair of bearings 36 on the other outer peripheral surface of the shaft 37. Attachable,
The drive magnet 38 is fixed to the inner peripheral surface of the hub 40 so as to face the stator core 35. A plurality of magnetic disks 42 are mounted on the outer peripheral surface of the hub 40 via a spacer 41. Reference numeral 45 is a magnetic head for writing and reading information on the magnetic disk 42, and 44 is a screw 43 for the magnetic disk 42.
It is a holding plate that fixes the.

In such a structure, when the drive coil 34 of the stator core 35 of the motor 48 is energized, the action of this current and the magnetic flux generated from the drive magnet 38 causes the hub 4 to which the drive magnet 38 is fixed.
Since rotational power is generated at 0, the magnetic disk 42 is driven to rotate, and the magnetic head 45 can write and read information.

[0005]

The conventional magnetic disk device has the following problems. (1) Since the motor 48 is arranged in the disk enclosure 33, dust is inevitably generated from the motor 48 due to the rotating operation, so that a highly reliable magnetic disk device cannot be realized. (2) Since the motor 48 is arranged in the disk enclosure 33, a space for installing the motor 48 is required, and therefore the magnetic disk device itself can be made smaller and thinner. (3) Since it is necessary to change the specifications of the motor for each drive, it is necessary to prepare an expensive custom-made motor each time, which inevitably results in an increase in cost. (4) Since the motor 48 is arranged in the disk enclosure 33, maintenance such as maintenance, inspection and repair of the motor 48 is inconvenient.

The present invention has been made to solve the above problems, and realizes high reliability, downsizing, thinning, cost reduction, and easy magnetic disk drive maintenance. It is intended to provide.

[0007]

In order to achieve the above object, the present invention according to claim 1 provides a hub for mounting a magnetic disk and rotating integrally with a shaft, a motor for rotationally driving the hub, A magnetic head that writes and reads information to and from a magnetic disk, a magnetic head drive unit that drives the magnetic head to perform a seek operation, and a disk that houses the magnetic disk, the magnetic head, and the magnetic head drive unit in a sealed manner. A magnetic disk device including an enclosure, wherein the motor is arranged outside the disk enclosure.

According to a second aspect of the present invention, in the first aspect, the disk enclosure has bearing holding portions at upper and lower opposite positions, and a bearing is attached to each bearing holding portion. At least one of the bearings rotatably supports a shaft having a power portion protruding to the outside of the disk enclosure, and a seal mechanism is provided inside each of the bearings in the axial direction. It is characterized in that it is transmitted to rotate the magnetic disk.

[0009]

According to the structure of the present invention according to claim 1, the rotational power is transmitted to the hub on which the magnetic disk is mounted via the shaft by the motor arranged outside the disk enclosure, so that the magnetic disk is the hub. It is driven to rotate integrally with.

According to the configuration of the present invention according to claim 2,
The disk enclosure of the motor according to claim 1, rotatably supporting a shaft of at least one of bearings mounted at upper and lower opposite positions, and a seal mechanism is provided inside each bearing in the axial direction, The rotational power of the motor is transmitted to the power section of the shaft.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a magnetic disk device of the present invention. An opening portion 4 is formed in a disk enclosure 3 composed of a top cover 1 and a bottom base 2, and bearing holding portions 5 are provided at upper and lower opposing positions of the disk enclosure 3 facing the opening portion 4, respectively. The bearing holding portions 5 hold the bearings 6 attached thereto, respectively. A shaft 7 having a large-diameter central portion 7A and a small-diameter end portion 7B is inserted into the opening portion 4, and each end portion 7B of the shaft 7 is supported by each bearing 6.

A pole piece 8 for generating a magnetic field for holding a magnetic fluid is arranged so as to cover the exposed surface of each bearing 6 toward the disk enclosure 3, and between the pole piece 8 and the central portion 7A of the shaft 7. Holds the magnetic fluid 9. The pole piece 8 constitutes a sealing mechanism inside the bearing 6 in the axial direction.

A hub 10 is fixed to the outer peripheral surface of the central portion 7A of the shaft 7, and a plurality of magnetic disks 12 are mounted on the outer peripheral surface of the hub 10 via a spacer 11. The magnetic disk 12 is a screw 1 screwed into the hub 10.
It is fixed by a pressing plate 14 pressed by 3. 15 is for writing information on the magnetic disk 12,
The magnetic head 15 is a magnetic head for reading, and the magnetic head 15 is supported by a magnetic head drive unit 16 and driven to perform a seek operation. As described above, the magnetic disk 12, the magnetic head 15, and the magnetic head drive unit 16 are hermetically housed in the disk enclosure 3. Further, one end, for example, the lower end of the end portion 7B of the shaft 7 is projected from the disk enclosure 3, and a pulley 17 is fixed to this end portion 7B to form a power unit.

A motor 18 is arranged below the disk enclosure 3, and the motor 18 is fixed to a frame 19 of a computer in which a magnetic disk device is incorporated. An output shaft 20 of the motor 18 is arranged so as to face the pulley 17 of the shaft 7, and the pulley 17 and the output shaft 20 are connected by a belt 21. Thereby, the rotational power of the motor 18 can be transmitted to the pulley 17 of the shaft 7 via the belt 21. The power supply to the motor 18 is performed from the power supply unit of the computer.

In the structure of the magnetic disk device of the present embodiment as described above, when the motor 18 is started by energizing, the rotational power of the motor 18 is transmitted via the belt 21 to the pulley (power unit) 17 of the shaft 7. Is transmitted to the shaft 7, the shaft 7 rotates. As a result, the hub 10 rotates integrally with the shaft 7, so that the magnetic disk 12 mounted on the hub 10 is rotationally driven, and the magnetic head 15 driven by the magnetic head drive unit 16 writes and reads information. .

Therefore, according to this embodiment, the following effects can be obtained. (1) Motor 18 outside the disk enclosure 3
Since the magnetic disk device is disposed, even if dust is generated from the motor 18 due to the rotation operation, the dust is not affected, and thus a highly reliable magnetic disk device can be realized. (2) The motor 18 is provided outside the disk enclosure 3.
Since the space is provided, a space for installing the motor 18 is required, and the magnetic disk device itself can be made smaller and thinner. (3) Since it is not necessary to prepare an expensive custom-made motor 18 for each drive, the cost can be reduced. (4) The motor 18 is provided outside the disk enclosure 3.
Since the motors are arranged, maintenance such as maintenance, inspection, and repair of the motor 18 becomes easy.

The magnetic disk drive according to the present embodiment is particularly suitable for 3.
It is effective when applied to a magnetic disk having a size of 5 inches or less. Further, the pulley 17 of the shaft 7 for transmitting the rotational power from the motor 18 may be provided at the opposite end 7B instead of being provided at the specific end 7B as shown in the embodiment. Further, the means for transmitting the rotational power is not limited to the combination of the pulley 16 and the belt 20, but other means such as a chain can be used.

[0018]

According to the first aspect of the present invention, the motor for rotating and driving the hub on which the magnetic disk is mounted is arranged outside the disk enclosure.
It is possible to achieve high reliability, downsizing and thinning, reduce costs, and further facilitate motor maintenance. According to a second aspect of the present invention, in the first aspect, the disk enclosure of the motor rotatably supports at least one of the bearings mounted at the upper and lower opposite positions, and the inner side in the axial direction of each bearing. Since each of them is provided with a sealing mechanism so that the rotational power of the motor is transmitted to the power part of the shaft, the same effect as in claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a magnetic disk device of the present invention.

FIG. 2 is a cross-sectional view showing a conventional magnetic disk device.

[Explanation of symbols]

 3 Disk Enclosure 4 Opening of Disk Enclosure 5 Bearing Holding Part 6 Bearing 7 Shaft 7A Shaft Center 7B Shaft End 8 Pole Piece 9 Magnetic Fluid 10 Hub 12 Magnetic Disk 15 Magnetic Head 16 Magnetic Head Drive 17 Pulley (Power) Part) 18 motor 20 motor output shaft 21 belt

Claims (2)

[Claims] 1. A hub that mounts a magnetic disk and rotates integrally with a shaft, a motor that drives the hub to rotate, a magnetic head that writes and reads information to and from the magnetic disk, and the magnetic head. A magnetic disk drive comprising: a magnetic head drive unit that drives and performs a seek operation; and a magnetic disk, a magnetic head, and a disk enclosure that hermetically accommodates the magnetic head drive unit, wherein the motor is a disk enclosure. A magnetic disk device, which is arranged externally. 2. The disk enclosure has bearing holding portions at upper and lower opposite positions, and a bearing is attached to each bearing holding portion, and at least one of the bearings has a power output projecting to the outside of the disk enclosure. A shaft having a portion is rotatably supported, a seal mechanism is provided inside each of the bearings in the axial direction, and rotational power of a motor is transmitted to a power portion of the shaft to rotate the magnetic disk. The magnetic disk device according to claim 1.