KR100417235B1 - Clamp device for preventing hard disk drive from sleeping - Google Patents

Abstract

PURPOSE: A clamp device for preventing an HDD(Hard Disk Drive) from sleeping is provided to form an inclined surface on an upper center surface of a spindle motor contacted with a clamp, and to form an edge part protruded toward a lower side of the clamp, thereby minimizing a disk sleep. CONSTITUTION: An inclined surface(1) is formed on an upper surface of a spindle motor(60) contacted with a clamp(2) for magnifying a coupling force of a disk(40). The inclined surface(1) inclines toward lower direction. An edge part(2a) is protruded toward a lower side of the clamp(2) on a contacted surface of the clamp(2) contacted with the inclined surface(1). By protruding the edge part(2a) toward the lower side, a diameter size is defined within a range being contacted with the inclined surface(1) while assembling into the spindle motor(60). When the disk(40) rotates according to a rotation of the spindle motor(60), a frictional force between the inclined surface(1) and the edge part(2a) is increased.

Description

Slip Prevention Clamp Device for Hard Disk Drive

The present invention relates to a clamp device of a hard disk drive, and more particularly, to a clamp device that prevents the slip of the disk by maximizing the friction force when the hard disk drive is impacted.

In general, as a secondary record storage device, a hard disk drive is an important element of a computer. Moreover, in today's multimedia environment, high capacity is inevitable through high-density recording of hard disk drives, and accordingly, the drive industry is trying to preempt any high ground for coping with high capacity through the development of new heads and media as well as more innovative technology. The competition is fierce.

In addition, hard disk drive is a mechatronics product composed of electronic devices and mechanical devices. The hard disk drive is a secondary memory device that records and reproduces information by sending a digital signal to a head that acts as an electromagnet and recording the information on a disk having magnetic properties. One.

As shown in FIG. 1, a hard disk drive typically requires a base 20 on which all components are based, a magnetic head 22 for input and output, and a magnetic head 22. As shown in FIG. An actuator 24 for moving to a position, a plurality of disks 40 for storing information from a magnetic body, a spindle motor 60 for rotating the disks 40 at a constant circumferential speed, and It is composed of a cover and a gasket which serve as a seal by blocking the component from the outside.

Looking at the operation according to the configuration, at one end of the actuator 24 is a magnet for recording or reading data recorded in the track (track) of the disk 40 that rotates at high speed by the spindle motor 60 The head 22 is installed. The magnetic head 22 is fixedly mounted to the arm 28 by a suspension 26.

The pivot shaft 36 (composed of a pivot screw and a pivot bearing), which is a rotational center of the actuator 24, is installed at one side of the center of the actuator 24.

The other side of the actuator 24 is wound a plurality of times and the voice coil 42 for moving the actuator 24 to a parking zone 34 and a data zone 32 includes a plastic bobbin ( 44: bobbin), the iron piece 45 is installed at the end of the bobbin 44.

Referring to the operating state of the hard disk drive configured as described above, when the power of the drive is "on", the spindle motor 60 is rotated at a constant circumferential speed, and thus the disk 40 fixed to the spindle motor 60 Also rotates at a constant speed. Subsequently, when the disk 40 rotates at a high speed, the magnetic head 22 rises to a certain height due to the pressure of the air film generated on the surface of the disk. In this state, the head 22 moves to a track position on the disc, and the drive sends a signal to the host computer that the drive is ready to execute a command through the interface.

When read / write information is input while the drive is ready for operation, the actuator 24 rotates about the pivot axis 36 in accordance with the position and speed signals of the control circuit part, and the tip of the actuator 24. The read / write head 22 fixed at the end is moved to a desired position (constant track) on the disc. Thereafter, the read / write circuit portion causes the head 22 to perform a read / write operation. At this time, the position and speed of the magnetic head 22 are controlled by the control circuit unit even during the read / write operation.

In the hard disk drive, as shown in FIG. 2, the hub of the spindle motor 60 fixed to the base 20 by a fastener 80 or an additive (adhesive) is provided by a plurality of disks ( 40: The higher the storage capacity, the more installed). A clamp 30 is installed at the top of the disks 40, and the disk is fixed by fastening a plurality of screws or fasteners with the spindle motor. A spacer 50 is installed between the plurality of disks to maintain the gap and to fix the spacer 50 due to friction with the contact surface.

However, as hard disk drives become denser, they become more susceptible to vibration and shock, and if shock is applied, disk slip has a fatal effect on product performance. Therefore, the conventional small hard disk drives 1.8 'and 2.5 have a problem in that disk slip occurs because the disk is fixed using only one screw. In other words, disk slipping occurs better than 3.5 'or larger disks.

In detail, the disk between the motor surface and the spacer is hardly slipped due to mirror-to-mirror encounter in the hard disk drive provided with a plurality of disks, but the disk engaged with the clamp on the top is simultaneously clamped. Slip may occur. The reason for this is as shown in Fig. 2, the screw is inserted into the hole in the center of the clamp, and then coupled with the female screw formed in the motor to secure the disk, but the diameter of the screw inserted into the clamp hole and the clamp hole This is because there is a space between the two components due to the existence of the size difference d1. Therefore, when the shock is applied, the force to prevent slipping of the disk at the top is the frictional force f1 of the opposite side of the surface (the contacting surface with the spacer) and the frictional force f2 of the surface where the screw and the clamp contact, the clamp There is a friction force f3 generated by the contact between the disk and the disc. At this time, since the flatness of the screw surface where the clamp and the screw contact each other is not as good as that of the spacer surface or the clamp surface, the friction force between the surface where the screw and the clamp contact is relatively high. small.

In this state, when eventually impacted, there are only two forces to prevent slipping of the top disk, friction force on the surface contacting the spacer and friction force on the surface where the screw and clamp contact. Therefore, the top-sided disc also occurs in impacts where slippage is less than that of the bottom-side disc, and the slip amount is the difference in size between the clamp hole and the screw diameter inserted into the clamp hole.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention to provide a clamp device for preventing slip of the hard disk drive to minimize the impact or vibration.

Another object of the present invention is to provide a clamp device for preventing slip of a hard disk drive of high reliability.

In order to achieve the above objects, an optimal embodiment according to the technical concept of the present invention is the lower center toward the center of the motor 60 in the upper middle surface of the spindle motor 60 in contact with the clamp maximizing the clamping force of the disk The inclined surface 1 is formed to descend in the direction, and the edge surface 2a is formed on the contact surface of the clamp 2 which is in contact with the inclined surface 1 so as to protrude protruding downwardly from the clamp 2. It is characterized by minimizing.

1 is a perspective view showing the configuration of a conventional hard disk drive

2 is a cross-sectional view illustrating a state in which a clamp is installed on a spindle motor of a hard disk drive according to a conventional embodiment.

3 is a cross-sectional view showing an upper portion of the spindle motor according to an embodiment of the present invention.

Figure 4a is a plan view showing a clamp for preventing slip according to an embodiment of the present invention, Figure 4b is a cross-sectional view thereof

5 is a cross-sectional view showing a state in which a clamp is installed on the spindle motor of the hard disk drive according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawing

1: Slope 2: Clamp

2a: clamp 10: cover

40: disc 60: spindle motor

70: screw

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The clamp device of the present invention assembles the disk assembly by assembling the disk to the spindle motor sequentially, then assembling spacers, and finally screwing the clamp with screws. That is, the assembly order is the same.

At this time, as shown in Figures 3, 4a, 4b, the clamp device according to the most preferred embodiment of the present invention has the gist of the present invention in the upper surface of the clamp and the spindle motor to which the clamp is coupled. Specifically, the inclined surface 1 is formed on the upper surface of the spindle motor in contact with the clamp maximizing the clamping force of the disk. The inclined surface 1 is formed to be inclined downward toward the center.

In addition, the contact surface of the clamp (2) in contact with the inclined surface (1) to form a corner portion (2a) to protrude to the lower side of the clamp to maximize the mutual frictional force. The corner portion 2a is formed so as to protrude downward, and determines the size of the diameter within the range that can be in contact with the inclined surface when assembling with the spindle motor. The frictional force is increased by contacting the inclined surface 1 by the outer circumferential length of the corner portion 2a. Since the edge portion 2a makes strong contact with the inclined surface 1, the frictional force due to contact is maximized.

As a result, as shown in FIG. 5, when the disk 40 rotates in accordance with the rotation of the spindle motor 60 by combining the two parts to complete the assembly, the inclined surface 1 and the corner portion 2a. The frictional force of the disk is significantly increased to minimize the disk slip of the disk.

As described above, the present invention is effective in suppressing the disk slip during the operation of the hard disk drive. On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

Claims (1)

In the clamp device of a hard disk drive, On the upper central surface of the spindle motor 60 in contact with the clamp maximizing the clamping force of the disk is formed an inclined surface (1) to be lowered downward toward the center of the motor 60, the clamp contacting the inclined surface ( 2) The contact surface of 2) to prevent the slipping of the hard disk drive, characterized in that to form a corner portion (2a) to protrude protruding to the lower side of the clamp (2).