JP2583346Y2 - Disk drive - 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 drive used for a floppy disk drive and the like, and more particularly, to a drive pin structure of the disk drive.

[0002]

2. Description of the Related Art In a floppy disk drive or the like, a hub base and a drive pin projecting from the hub base and engaging with an engagement hole of a disk hub mounted on the hub base for positioning the disk and rotating the disk are provided. Is used. FIG. 3 shows an example of a conventional disk drive. In FIG. 3, a ball bearing 2 is fitted in a cylindrical portion at the center of the housing 1, and the spindle 3 is rotatably supported by the ball bearing 2. A stator of a motor (not shown) is attached to the housing 1, and a rotor of the motor (not shown) is integrally attached to a lower end of the spindle 3.
The spindle 3 is driven to rotate.

A hub 4 is formed integrally with the upper end of the spindle 3 by a plastic magnet. A spindle 3 is provided at a portion of the hub base 4 facing the ball bearing 2.
Are formed so as to surround. A leaf spring 19 is attached to the lower surface side of the hub base 4, and a driving pin 20 is attached to the leaf spring 19. The drive pin 20 has a support shaft 9 fixed to a leaf spring 19 and a drive roller 18 rotatably supported by the support shaft 9. The drive roller 18 rotates about its axis. The drive roller 18 penetrates the hole of the hub 4 with a sufficient space, and protrudes toward the upper surface of the hub 4. On the upper surface of the hub base 4,
A film-like sliding member 7 is attached. The hub base 4 is magnetized, and magnetically attracts the disk hub mounted on the hub base 4.

A disk hub is mounted on the upper surface of the hub base 4, the upper end of the spindle 3 is engaged with the center hole of the disk hub, and the drive pin 20 is engaged with the engagement hole of the disk hub. The drive pin 20 positions the disk hub on the hub 4 by the elastic force of the leaf spring 19, and the hub 4 is rotated together with the spindle 3 to rotate the disk hub and the disk integrated therewith.

The support shaft 9 constituting the drive pin 20 is made of stainless steel, and the drive roller 18 is made of, for example, carbon steel for a tool. The drive roller 18 is barrel-processed to improve the surface roughness of the inner periphery in sliding contact with the support shaft 9 as well as the outer periphery, and the oil is interposed between the drive roller 18 and the shaft 9 to smooth the rotation of the drive roller. Is applied.

[0006]

According to the conventional disk drive described above, since the drive roller 18 constituting the drive pin 20 is made of a race material, the drive roller 18 and the support shaft 9 are provided to smooth the rotation. Need to be oiled.
If the oil is not applied, the rotation of the drive roller 18 will not be smooth, the positioning of the disk hub with respect to the hub base 4 will not be performed smoothly, and the positioning accuracy will be reduced. Further, the lace material itself has a high cost, and furthermore, it is necessary to carry out a barrel treatment in order to improve the surface roughness.

The present invention has been made to solve such problems of the prior art, and the rotation is smooth without applying oil to the drive roller, the cost of the drive roller itself is low, and It is another object of the present invention to provide a disk drive device which has a good surface roughness and can eliminate the need for barrel processing for improving the surface roughness.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a hub base and a disk hub which protrudes from the hub base and is engaged with an engaging hole of a disk hub mounted on the hub base to position the disk and drive the disk to rotate. And a drive pin, wherein the drive pin has a drive roller rotatably supported about the axis thereof, wherein the drive roller is an oil-free sintered metal. Non-oil-impregnated sintered metal
It is more preferable to use an iron-based sintered metal.

[0009]

The non-oil-containing sintered metal originally has a smooth sliding surface with the shaft and does not require oil for lubrication. Non-oil-containing
Sintered metal such as sintered metal has good surface roughness and does not require barrel treatment. If the non-oil-containing sintered metal is an iron-based sintered metal, it is advantageous to secure hardness.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive according to the present invention will be described below with reference to the drawings. Note that FIG.
The same components as those of the conventional example shown in FIG. In FIG. 1, two ball bearings 2, 2 are fitted up and down in a central cylindrical portion of a housing 1,
The spindle 3 is rotatably supported by the ball bearings 2 and 2. A stator core 12 is assembled to the housing 1 with a spacer 11 interposed therebetween. An appropriate number of salient poles formed on the stator core 12
4 are wound. A flat cup-shaped rotor case 15 is integrally attached to the lower end of the spindle 3, and a rotor magnet 16 is fixed to the inner peripheral surface of the peripheral wall of the rotor case 15. The inner peripheral surface of the rotor magnet 16 faces each of the salient poles with an appropriate gap therebetween, and the energization of the drive coil 14 of each salient pole is switched in accordance with the rotational position of the rotor magnet 16, so that the rotor magnet 16
In addition, the rotor case 15 and the spindle 3 integrated therewith are driven to rotate.

A hub 4 is integrally formed on the upper end of the spindle 3 with a plastic magnet. A spindle 3 is provided at a portion of the hub base 4 facing the ball bearing 2.
Are formed so as to surround. A leaf spring 19 is attached to the lower surface side of the hub base 4, and the drive pin 10 is attached to the leaf spring 19. The drive pin 10 has a support shaft 9 fixed to a leaf spring 19 and a drive roller 8 rotatably supported by the support shaft 9. The drive roller 8 rotates about its axis. The drive roller 8 penetrates the hole of the hub 4 with a sufficient space, and protrudes toward the upper surface of the hub 4. A film-like sliding member 7 is attached to the upper surface of the hub base 4. Hub stand 4
Are magnetized to magnetically attract the disk hub mounted on the hub base 4.

The drive roller 8 is made of sintered metal, unlike the drive roller of a conventional disk drive. Moreover, unlike a general sintered metal used as a bearing, it is a non-oil-containing sintered metal containing no oil. The drive roller 8 is preferably made of an iron-based sintered metal in order to secure its hardness.

As shown in detail in FIG. 2, the projection 5 of the hub base 4 comes into contact with the inner ring of the bearing, and its inner peripheral side is removed along the peripheral surface of the spindle 3 in the form of a circumferential groove. Thus, a so-called necking 6 is formed.

A disk hub is mounted on the upper surface of the hub base 4, the upper end of the spindle 3 is engaged with the center hole of the disk hub, and the drive pin 10 is engaged with the engagement hole of the disk hub. When the hub 4 is driven to rotate and the drive pin 10 coincides with the engagement hole of the disk hub, the leaf spring 19
The drive pin 10 jumps into the engagement hole of the disk hub by the elasticity of the disk hub, and the drive pin 10 positions the disk hub on the hub base 4 by the elasticity of the leaf spring 19. When the hub 4 is driven to rotate together with the spindle 3, the disk hub and the disk integrated therewith are driven to rotate.

As described above, since the drive roller 8 constituting the drive pin 10 is made of an oil-free sintered metal, its rotation with respect to the support shaft 9 becomes smooth, and oil is applied to the sliding contact surface with the support shaft. You don't have to. Further, since the rotation of the drive pin 10 is smooth, a small positioning torque is sufficient, and there is an advantage that the chucking characteristic of the disk hub is improved. Furthermore, the cost of the sintered metal itself is lower than that of the lace material, and the surface roughness is originally good, so
No barrel treatment or the like for improving the surface roughness is required, and the cost can be reduced from this point as well.
If the drive roller 8 is made of an iron-based sintered metal, a more preferable drive roller can be obtained from the viewpoint of securing hardness.

By the way, when the spindle 3 and the hub 4 are integrally formed of plastic as in the conventional example shown in FIG. 3, burrs are likely to occur at the boundary between the hub 4 and the spindle 3. In particular, when burrs are formed on the surface facing the ball bearing 2 as indicated by reference numeral 4a in FIG. 3, the burrs interfere with the ball bearing 2, and the hub base floats or the burrs are crushed over time and the hub is broken. There is a problem that the height of the hub base 4 fluctuates or burrs penetrate into the inside of the ball bearing to cause a runout of the hub base 4 and a runout of the spindle 3.

In this regard, according to the embodiment of the present invention, since the necking 6 is formed on the inner peripheral side of the protrusion 5 of the hub base 4, the boundary between the hub base 4 and the spindle 3, as shown in FIG. Even if the burr 4a occurs in the portion, the necking 6
Burrs 4a and the ball bearings 2 do not interfere with each other, and the various problems described above can be solved. As described above, since the necking 6 serves as an escape for the burr 4a, it is desirable that the depth D of the necking 6 is equal to or higher than the height of the burr 4a.

[0018]

According to the present invention, since the drive roller constituting the drive pin is made of a non-oil-containing sintered metal, the rotation is smooth and there is no need to apply oil. In addition, since the rotation of the drive pin is smooth, there is an advantage that a small positioning torque is sufficient and the chucking characteristics of the disk hub are improved. Furthermore, the cost of the sintered metal itself is lower than that of the lace material, and the surface roughness is originally good, so
No barrel treatment or the like for improving the surface roughness is required, and the cost can be reduced from this point as well.
If the drive roller is made of an iron-based sintered metal, a more preferable drive roller can be obtained from the viewpoint of securing hardness.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a disk drive device according to the present invention.

FIG. 2 is an enlarged sectional view of a coupling portion between the spindle and the hub base according to the embodiment.

FIG. 3 is a cross-sectional view showing a main part of a conventional disk drive device.

[Explanation of symbols]

 4 Hub stand 8 Drive roller 10 Drive pin

Claims (2)

(57) [Scope of request for utility model registration] A drive pin projecting from the hub base and engaging with an engagement hole of a disk hub mounted on the hub base to perform positioning of the disk and rotational drive of the disk; A disk drive device comprising: a pin; and a drive roller rotatably supported about an axis thereof, wherein the drive roller is made of a non-oil-containing sintered metal. 2. The disk drive according to claim 1, wherein the oil-free sintered metal is an iron-based sintered metal.