JP2987217B2 - Disc clamp mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp mechanism for mounting a recording disk such as a magnetic disk on a hub member.

[0002]

2. Description of the Related Art In general, a spindle motor for driving a recording disk to rotate is generally composed of a bracket attached to a frame of a driving device, a hub member rotatable relative to the bracket, a bracket and a hub member. A rotor magnet is mounted on the inner peripheral surface of the hub member, and a stator is disposed to face the rotor magnet. Then, a recording disk such as a magnetic disk is mounted on a hub member by a clamp mechanism.

[0003] This clamp mechanism includes a disk mounting surface defined on a hub member and a clamp member mounted on the hub member. The clamp member is formed of a disk-shaped member, and a pressing surface is defined at a peripheral portion thereof in correspondence with the disk mounting surface. One or more holes are formed in the clamp member, and a fixing screw is screwed into the hub member through the hole, whereby the clamp member is mounted on the hub member, and the recording disk is mounted on the disk mounting surface. And the pressing surface.

[0004]

However, the conventional clamp mechanism requires a pressing member and a fixing screw to fix the recording disk, and thus has a problem that the configuration is relatively complicated and the number of parts is increased. . Further, when fixing, the fixing screw must be screwed to the hub member through the hole of the clamp member , and especially when a large number of fixing screws are used, the work of fixing the disk becomes extremely complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clamp mechanism capable of securely mounting a recording disk on a hub member with a simple configuration and easy operation.

[0006]

Means for Solving the Problems In the disk clamping mechanism of the present invention, the hub member has a disk-shaped recording disk.
Radially outside the outer peripheral surface of the hub member into which the center hole of the
A substantially flat disk mounting surface protruding in the direction is defined,
An annular concave portion having a substantially semicircular cross section is defined on the outer peripheral surface above the disk mounting surface, and the clamping means for clamping the disk is constituted by an O-ring having elasticity. The recording disk is sandwiched between the disk mounting surface and the O-ring only by mounting the recording disk in the annular concave portion.

[0007]

According to the clamp mechanism of the present invention, the recording disk can be mounted by mounting the O-ring on the annular concave portion while the recording disk is mounted on the disk mounting surface. And it can be easily attached to the hub member. Further, it is sufficient to define the disk mounting surface and the annular concave portion for the O-ring on the hub member and use only the O-ring, so that the recording disk can be securely fixed with a simple configuration.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk clamp mechanism according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a spindle motor employing one embodiment of a disk clamping mechanism according to the present invention. In FIG. 1, the spindle motor shown is a bracket 2 and a hub rotatable relative to the bracket 2. A member 4 is provided, and a pair of bearing members 6 and 8 are interposed between the bracket 2 and the hub member 4. The bracket 2 has a substantially circular bracket body 10, and a flange portion 12 is integrally formed on an outer peripheral portion of the bracket body 10, and the flange portion 12 is attached to a frame (not shown) of the drive device by, for example, mounting screws. Mounted. Bracket body 10
1, a cylindrical wall 14 projecting upward in FIG. 1 is provided, and the hub member 4 is rotatably supported on the cylindrical wall 14 via a pair of bearing members 6 and 8. .

The hub member 4 has a cup-shaped hub body 16. A substantially central portion in the axial direction of the hub body 16 is integrally provided with a flange portion 18 projecting outward in the radial direction.
The upper surface of the flange portion 18 functions as a disk mounting surface 18a. On the outer peripheral surface of one end (upper end) of the hub main body 16, an annular concave portion 20 having a substantially semicircular cross section is defined. A shaft 22 extending downward is integrally formed on the inner surface of the center of the end wall of the hub body 16. The other end of the hub body 16 is connected to the cylindrical wall 14 of the bracket body 10.
Extend downward along the outer peripheral surface. The shaft portion 22 of the hub body 16 extends downward beyond the other end portion, and the shaft portion 22 is supported by bearing members 6 and 8 arranged at a predetermined interval. The hub body 16 is preferably formed of aluminum or an aluminum alloy. With this configuration, the mounting surface 18a, which requires high accuracy,
Outer peripheral surface of shaft portion 22 extending from end wall portion 20 and hub body 1
Processing of the outer peripheral surface of one end (the outer peripheral surface facing the inner peripheral surface of the magnetic disk 22) and the like becomes easy.

The hub member 4 further includes a cylindrical holder member 24. The holder member 24 has a disk-shaped base 26 and an annular hanging portion 2 extending downward from the outer peripheral edge of the base 26.
The inner peripheral surface of the base 26 is fixed to the other end of the hub body 16 by means such as press fitting, and the rotor magnet 30 is mounted on the inner peripheral surface of the hanging portion 28. This holder member 24 is preferably made of a magnetic material such as iron. With this configuration, the rotor magnet 30 can be provided without providing a magnetic flux leakage preventing member such as a yoke member.
And leakage of magnetic flux from the magnetic circuit composed of the stator 34 can be effectively prevented, and the space for the magnetic circuit can be increased because no yoke member is required, thereby reducing the size of the motor. Is achieved.

The stator 34 is disposed to face the rotor magnet 30. The stator 34 has a stator core 36 formed by stacking a plurality of (for example, three) plates, and a coil 38 wound around the stator core 36.
0 is fixed to the outer peripheral surface of the cylindrical wall 14. In addition, a seal 40 is attached to the outer surface of the bracket body 10, thereby sealing the bearing mounting hole 42 formed in the cylindrical wall 14.

Next, a recording disk 3 such as a magnetic disk
The clamp mechanism 46 for clamping 2 will be described. Referring to FIG. 2 together with FIG. 1, the illustrated clamping mechanism 46 includes an O-ring 48 as clamping means. The O-ring 48 has a circular cross section, and its outer diameter is substantially the same over the entire circumference. The outer diameter of this O-ring is shown in FIG.
As can be understood from FIG. 3, the diameter of the annular recess 20 of the hub body 16 is set to be substantially the same as or slightly larger than this.
It is important that the O-ring 48 has elasticity,
For example, it can be formed from synthetic rubber.

The disk mounting surface 18a located below the annular recess 20 is substantially perpendicular to the center axis of rotation of the hub member 4 and extends substantially flat. This mounting surface 18
The distance from a to the lower edge of the annular recess 20 is set to be slightly smaller than the thickness of the recording disk 32. Therefore, when the recording disk 32 is mounted on the mounting surface 18a,
The upper end of the recording disk 32 is located slightly above the lower edge of the annular recess 20, so that when the O-ring 48 is mounted, it acts on the recording disk 32 elastically.

In the clamp mechanism 46, the disk 32 is mounted by placing the disk-shaped recording disk 32 on the mounting surface 18a of the hub member 4, and then the O-ring 48
The recording disk 32 can be easily attached to the hub member 4 with a simple operation. In such a mounted state, the O-ring 48 elastically acts on the inner peripheral edge of the recording disk 32. Therefore, the recording disk 32 is securely secured between the mounting surface 18a of the hub member 4 and the O-ring 48 as required. Is held.

The clamping mechanism as described above has 42 to 5
It can be advantageously applied to support a single recording disk 32 of about 58 mm to about 68 mm, which is about 0 mm or slightly larger, and is suitable for mounting a relatively large recording disk 32 or mounting a plurality of recording disks. Is not suitable.

Although the embodiment of the disc clamping mechanism according to the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications and alterations can be made without departing from the scope of the present invention. It is.

[0018]

According to the clamp mechanism of the present invention, in order to mount a recording disk, it is only necessary to mount the O-ring in the annular concave portion after mounting the disk on the disk mounting surface, and the operation is relatively simple and easy. The disk can be mounted on the hub member. Further, as a configuration, it is only necessary to define the disk mounting surface and the annular concave portion for the O-ring on the hub member and use the O-ring, and the recording disk can be securely fixed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a spindle motor adopting an embodiment of a clamp mechanism according to the present invention.

FIG. 2 is an enlarged sectional view showing a part of the spindle motor of FIG. 1;

[Explanation of symbols]

 2 Bracket 4 Hub member 18 Hub body 18a Placement surface 20 Annular recess 24 Holder member 32 Recording disk 46 Clamp mechanism 48 O-ring

Claims (1)

(57) [Claims] A hub member rotatably driven in a predetermined direction;
A disc clamping mechanism including a disc-shaped recording disk fitted into the hub member by inserting a center hole into an outer peripheral surface of the hub member, and a clamp means for clamping the recording disk, wherein the hub member includes: A substantially flat disk mounting surface that protrudes radially outward from the outer peripheral surface is defined, and the outer peripheral surface above the disk mounting surface has an annular recess having a substantially semicircular cross section. The clamping means is constituted by an O-ring having elasticity, and the recording disk can be attached to the disk mounting surface and the O-ring only by mounting the O-ring in the annular concave portion. A disk clamp mechanism sandwiched between the disk clamp mechanisms .