KR20130096016A - Hub for spindle motor and spindle motor having the same - Google Patents

Abstract

The present invention is a hub for a spindle motor coupled to the rotating member, the disk is mounted, the rotating member insertion hole is inserted into the rotating member, the disk mounting portion formed in the circumferential direction so that the disk is seated, and extends in the circumferential direction A balance adjustment groove formed in a circular shape, and a balance adjustment member made of a shape corresponding to the balance adjustment groove, and inserted into the balance adjustment groove.

Description

Hub for Spindle Motor and Spindle Motor including the same

The present invention relates to a hub for a spindle motor and a spindle motor including the same.

In general, a spindle motor used as a drive device for a recording disk such as a hard disk has a lubricating fluid such as oil stored between a rotating part and a fixed part when the motor rotates, and a fluid dynamic bearing using the generated dynamic pressure is provided. It is used in various ways.

More specifically, since a spindle motor equipped with a hydrodynamic bearing which maintains the shaft stiffness only by the operating pressure of the lubricant by centrifugal force is based on the winsim force, there is no metal friction and the stability is increased at high rotational speeds to prevent noise and vibration. It is mainly used in high-end optical disk devices and magnetic disk devices because it is less likely to occur and the high-speed rotation of the rotating body is smoother than a motor having a ball bearing.

The patent document described in the following prior art document is a spindle motor having a hydrodynamic bearing, and has a problem that is very difficult to adjust when the rotating part is not balanced.

US 6534890 B

The present invention has been made to solve the above problems, the aspect of the present invention is to form a balance adjustment groove in the circumferential direction in the hub, a method of inserting the balance adjustment member in the balance adjustment groove for the balance adjustment of the rotating part In order to provide a spindle motor including a hub for a spindle motor and a spindle motor including the same, the balance may be more easily adjusted.

Hub for spindle motor according to an embodiment of the present invention is a spindle motor hub is coupled to the rotating member, the disk is mounted, the rotating member insertion hole is inserted into the rotating member, and the disk is mounted in the circumferential direction And a disk adjustment unit formed in the shape, corresponding to the balance adjustment groove, and a balance adjustment groove extending in the circumferential direction and formed in a circular shape.

In addition, the balance adjusting member of the spindle motor hub according to an embodiment of the present invention may be made of an elastic member and may be pressure-coupled to the balance adjusting groove.

In addition, the balance adjusting groove of the hub for the spindle motor according to an embodiment of the present invention may be formed on the upper surface of the hub.

Spindle motor according to an embodiment including a hub for a spindle motor according to the present invention is a rotating part including a rotating shaft, a hub, a magnet, a sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, the magnet and An opposing and fixed part comprising an armature made of a core and a coil, fixed to the base, filled with oil to form a hydrodynamic bearing between the rotating part and the fixed part, and the hub extending in the circumferential direction A balance adjustment groove formed in a circular shape is formed, and a balance adjustment member having a shape corresponding to the balance adjustment groove is inserted into the balance adjustment groove.

In addition, the hub of the spindle motor according to an embodiment including a hub for a spindle motor according to the present invention is a cylindrical portion fixed to the rotating shaft, a disk portion extending radially outward from the cylindrical portion, and the disk portion And a side wall portion extending downward from the radially outer end in the axial direction of the rotation shaft, a disc mounting portion extending radially outwardly from the side wall portion, and a balance adjustment groove formed on an upper surface of the disc portion.

In addition, the balance adjusting member of the spindle motor according to the embodiment including the hub for the spindle motor according to the present invention may be made of an elastic member and pressure-coupled to the balance adjusting groove.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, by adjusting the balance by forming a balance adjustment groove in the hub in the circumferential direction and inserting a balance adjustment member into the balance adjustment groove for the balance adjustment of the rotating part, the adjustment of the balance is more simple and precise. It is possible to obtain a hub for a spindle motor and a spindle motor including the same.

1 is a plan view schematically showing a hub for a spindle motor according to an embodiment of the present invention.
FIG. 2 is a sectional view schematically showing the hub for the spindle motor shown in FIG. 1. FIG.
Figure 3 is a schematic cross-sectional view of a spindle motor according to an embodiment including a hub for a spindle motor according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It is also to be understood that the terms "first,"" second, "" one side,"" other, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view schematically showing a hub for a spindle motor according to an embodiment of the present invention, Figure 2 is a cross-sectional view schematically showing the hub for a spindle motor shown in FIG. As shown in the drawing, the spindle motor hub 10 includes a rotating member insertion hole 11, a disk mounting portion 12, and a balance adjustment groove 13, and a balance adjustment inserted into the balance adjustment groove 13. And a member 14.

More specifically, the spindle motor hub 10 is formed in a disc shape, and the rotating member insertion hole 11 is formed to press-fit the rotating shaft or the sleeve which is the rotating member.

In addition, the disk mounting portion 12 is formed in the circumferential direction so that the disk is seated and mounted.

In addition, when the hub 10 is coupled to the rotating member and mounted on the spindle motor, a balance adjustment groove 13 for balance adjustment is formed. The balance adjusting groove 13 has a circular shape extending in the circumferential direction. The balance adjustment groove 13 may be formed on the upper surface of the hub 10.

In addition, the balance adjusting member 14 has a shape corresponding to the balance adjusting groove 13. And it may be made of an elastic material to be pressure-coupled to the balance adjustment groove (13).

As such, the hub for the spindle motor according to the embodiment according to the present invention adjusts the balance by inserting a balance adjusting member into the balance adjusting groove for adjusting the balance of the rotating part when mounted to the spindle motor. The adjustment of the balance can be made simpler and more sophisticated.

3 is a cross-sectional view schematically showing a spindle motor according to an embodiment including a hub for a spindle motor according to the present invention.

As illustrated, the spindle motor 100 includes a rotating part including a rotating shaft 110, a hub 120, a magnet 130, and a thrust plate 140, a sleeve 150, a sealing member 160, and a base ( 170), the armature 180 and the cover 190 is made up of a fixed portion, and a working fluid oil is injected to form a hydrodynamic bearing between the rotating portion and the fixed portion.

More specifically, in the rotating part, the hub 120 is fixedly coupled to the upper portion of the rotating shaft 110.

In addition, the hub 120 includes a cylindrical portion 121 fixed to the rotation shaft 110, a disc portion 122 extending radially outward from the cylindrical portion 121, and the disc portion 122. The side wall portion 123 extending downward in the axial direction of the rotation axis at the radially outer end, the disk mounting portion 124 extending radially outward from the side wall portion 123, and the balance adjustment groove 125 are formed. And a balance adjusting member 126 inserted into the balance adjusting groove 125.

The magnet 130 having an annular ring shape is mounted on an inner circumferential surface of the side wall part 123 so as to face the armature 180 including the core 181 and the coil 182.

The disk seating portion 124 is formed in the circumferential direction of the hub, and the disk (not shown) is mounted.

In addition, the balance adjustment groove 125 is for adjusting the balance of the spindle motor when the rotating part is coupled to the fixed portion is made of a circular extending in the circumferential direction. In addition, the balance adjusting groove 125 is formed on the upper surface of the hub 120, that is, the upper surface of the disc portion 122 to facilitate insertion of the balance adjusting member 126.

In addition, the outer circumferential surface of the rotating shaft 110 is mounted to the lower portion of the hub 120, the thrust plate 140 facing the upper surface of the sleeve is mounted. A thrust dynamic pressure generating groove (not shown) may be formed in the thrust plate 140 to form a sleeve and a thrust dynamic bearing.

Next, in the fixing part, the sleeve 150 supports the rotation shaft 110 to be rotatable.

In addition, the sealing member 160 is coupled to the upper portion of the sleeve 150 to form the thrust plate 140 and the oil sealing portion.

Further, the sleeve 150 has a minute gap formed between the outer circumferential surface of the rotating shaft 110, and oil is injected into the minute gap to form a radial dynamic bearing part (not shown). In addition, the radial dynamic bearing may be formed on the upper and lower portions of the sleeve.

In addition, a dynamic pressure generating groove (not shown) is selectively formed at upper and lower portions of the inner circumferential surface of the sleeve 150 or upper and lower portions of the outer circumferential surface of the rotation shaft 110 to form the radial dynamic bearing portion.

In addition, the sleeve 150 has an oil circulation hole 151 connecting the upper and lower surfaces of the sleeve 150 so that the oil injected to form the hydrodynamic bearing portion circulates through the rotating shaft system. It can be formed in the direction.

In addition, the sleeve 150 is fixed to the inner circumferential surface of the base 170 by pressing or bonding. In addition, an armature 180 made of a core 181 and a coil 182 is fixed to the outer circumferential portion of the base 170 by indentation or adhesion to face the magnet 130.

In addition, a pulling plate 171 may be mounted to the base 170 so as to face the magnet 130 with respect to the axial direction of the rotating shaft, and the pulling plate 171 may be rotated by the attraction force of the magnet 130. To prevent injury.

In addition, the cover 190 is for sealing the oil injected to form the hydrodynamic bearing, and is coupled to the lower inner circumferential surface of the sleeve 150.

As such, the spindle motor according to the present invention adjusts the balance by inserting the balance adjusting member into the balance adjusting groove for adjusting the balance of the rotating unit, so that the balance can be more easily and precisely adjusted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: hub 11: rotating member insertion hole
12: disc mounting portion 13: balance adjustment groove
14: disc adjusting member
100: spindle motor 110: rotation axis
120: hub 121: cylindrical portion
122: disc portion 123: side wall portion
124: disc mounting portion 125: balance adjustment groove
126: balance adjustment member
130: magnet 140: thrust plate
150: sleeve 151: oil circulation hole
160: sealing member 170: base
171: pulling plate 180: armature
181: core 182: coil
190: cover

Claims (6)

A hub for a spindle motor coupled to a rotating member, the disk is mounted,
A rotating member insertion hole into which the rotating member is inserted and coupled;
A disk mounting portion formed in the circumferential direction so that the disk is seated;
A balance adjusting groove extending in the circumferential direction and formed in a circular shape; And
A hub for a spindle motor comprising a balance adjusting member formed in a shape corresponding to the balance adjusting groove and inserted into and coupled to the balance adjusting groove.
The method according to claim 1,
The balance adjustment member is made of an elastic member hub for the spindle motor, characterized in that the pressure adjustment is coupled to the groove.
The method according to claim 1,
The balance adjusting groove is a hub for a spindle motor, characterized in that formed on the upper surface of the hub.
A rotating part including a rotating shaft, a hub, and a magnet,
A sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, a fixing part including an armature opposed to the magnet and fixedly coupled to the base, and including an arm made of a core and a coil; A hydrodynamic bearing part is formed between the fixed parts,
The hub
And a balance adjustment groove formed in a circular shape extending in the circumferential direction, the balance adjustment member having a shape corresponding to the balance adjustment groove is inserted into the balance adjustment groove.
The method of claim 4,
The hub
A cylindrical part fixed to the rotating shaft;
A disc portion extending radially outward from the cylinder portion;
A side wall portion extending downward in the axial direction of the rotation shaft at a radially outer end of the disc portion;
A disc mounting portion extending radially outward from the side wall portion; And
And a balance adjusting groove formed on an upper surface of the disc portion.
The method of claim 4,
The balance adjustment member is made of an elastic member, the spindle motor, characterized in that the pressure adjustment is coupled to the groove.

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