KR20130122237A

KR20130122237A - Spindle motor

Info

Publication number: KR20130122237A
Application number: KR1020120045415A
Authority: KR
Inventors: 박동진
Original assignee: 삼성전기주식회사
Priority date: 2012-04-30
Filing date: 2012-04-30
Publication date: 2013-11-07

Abstract

Spindle motor according to the present invention includes a rotating part including a hub integral sleeve and a magnet coupled to the hub integral sleeve, a shaft for rotatably supporting the sleeve, a shaft holder fixed to the shaft, the shaft holder is coupled A working fluid including a base, an armature coupled to an outer circumference of the base so as to face the magnet, and a stopper coupled to the shaft so as to face the rotatable portion in an axial direction of the shaft and preventing an injury of the rotatable portion, Phosphorus oil is injected to form a hydrodynamic bearing portion between the rotating portion and the fixed portion.

Description

[0001] SPINDLE MOTOR [0002]

The present invention relates to a spindle motor.

BACKGROUND Information recording and reproducing apparatuses, such as server hard disk drives, are generally equipped with a so-called shaft fixed spindle motor for fixing a shaft having high impact resistance to a box of a hard disk drive.

That is, the spindle motor mounted on the hard disk drive for the server is fixedly provided with a shaft for preventing information recorded on the server from being damaged by an external shock or preventing the information from being written or read.

The patent document described in the following prior art document is a spindle motor having a fluid dynamic pressure bearing. However, in the case of the fixed shaft type motor according to the prior art, it is difficult to implement precise design according to the gap management and cumulative error of the rotating sleeve and the dynamic pressure generating part of the shaft, and the productivity is reduced as the sleeve and the hub are separately manufactured and combined, and oil surface management It also has a difficult problem.

US 6534890 B

The present invention has been made to solve the above problems, the aspect of the present invention includes an integrated sleeve to simplify the assembly process to increase the productivity, to prevent the injury of the rotating portion through the stopper coupled to the upper end of the shaft At the same time, as the oil interface can be managed before the stopper is mounted, productivity is not only increased because no oil management is required, and the spindle motor has a more stable structure as the outflow of oil is prevented through the stopper. It is to.

A spindle motor according to the first embodiment of the present invention includes a rotating part including a hub integrated sleeve and a magnet coupled to the hub integrated sleeve, a shaft for rotatably supporting the sleeve, a shaft holder fixed to the shaft, and A fixed part including a base to which the shaft holder is coupled, an armature coupled to the outer circumference of the base so as to face the magnet, and a stopper coupled to the shaft so as to face the rotation part in the axial direction of the shaft and preventing the injury of the rotation part. The oil, which is a working fluid, is injected to form a hydrodynamic bearing unit between the rotating unit and the fixed unit.

In addition, the stopper of the spindle motor according to the first embodiment of the present invention may be coupled to the upper end of the shaft opposite to the rotating part.

In addition, the stopper of the spindle motor according to the first embodiment of the present invention is a protrusion formed on the opposite surface of the hub integral sleeve, the hub integral sleeve is formed with a groove corresponding to the protrusion.

In addition, in the spindle motor according to the first embodiment of the present invention, an oil interface is formed in the microgap between the shaft and the upper end of the hub-integrated sleeve opposed to the shaft.

In addition, in the spindle motor according to the first embodiment of the present invention, an oil interface may be formed between the shaft holder and the hub integral sleeve.

The spindle motor according to the second embodiment of the present invention includes a rotating part including a hub integrated sleeve and a magnet coupled to the hub integrated sleeve, a shaft for rotatably supporting the sleeve, a base coupled with the shaft, and a magnet. An armature coupled to the outer circumferential portion of the base so as to face and a stopper coupled to the shaft so as to face the rotating portion in the axial direction of the shaft and preventing an injury of the rotating portion, and oil which is a working fluid is injected A hydrodynamic bearing part is formed between the rotating part and the fixed part.

Further, the stopper of the spindle motor according to the second embodiment of the present invention is coupled to the upper end of the shaft opposite to the rotating part.

In addition, the stopper of the spindle motor according to the second embodiment of the present invention has a protrusion formed on the opposite surface of the hub integral sleeve, the groove integral portion is formed with a groove corresponding to the protrusion.

In addition, in the spindle motor according to the second embodiment of the present invention, an oil interface may be formed in a micro gap between the shaft and the upper end of the hub-integrated sleeve opposite to the shaft.

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, the assembly process is simplified, including an integrated sleeve, to increase productivity, and to prevent the injuries of the rotating part through a stopper coupled to the upper end of the shaft. The oil management is not required to increase the productivity, as well as to prevent the outflow of oil through the stopper to obtain a spindle motor having a more stable structure.

1 is a cross-sectional view schematically showing a spindle motor according to a first embodiment of the present invention.
2 is a cross-sectional view schematically showing a spindle motor according to a second embodiment of 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 will be further understood that terms such as " 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, exemplary embodiments of the spindle motor according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing a spindle motor according to a first embodiment of the present invention. As shown in the drawing, the spindle motor 100 includes a fixing part including a shaft 110, a shaft holder 120, a base 130, an armature 140, and a stopper 150, and a hub integrated sleeve 160. , Consisting of a rotating part including a magnet 170, the oil is filled with a working fluid is formed between the rotating portion and the fixed hydrodynamic bearing portion.

More specifically, in the rotating portion, the hub-integrated sleeve 160 is integrally formed to perform the roles of the sleeve and the hub at the same time. To this end a shaft 110 is inserted into its inner diameter and the sleeve 120 is rotatably supported by the shaft 110. In addition, a magnet is mounted to the hub-integrated sleeve 160 to face the armature 140 of the stator.

To this end, the hub-integrated sleeve 160 has a cylindrical portion 161 in which the shaft is inserted and a hydrodynamic bearing portion is formed at a small distance from the shaft, and a disc portion extending radially outward from the cylindrical portion 161 ( 162, and a side wall portion 163 extending downward in the axial direction of the rotation shaft at the radially outer end of the disc portion 162.

In addition, the cylindrical portion 161 is formed with a communication portion 161 ′ communicating with the outside to form an oil interface.

In addition, the magnet 170 made of an annular shape is mounted on the inner circumferential surface of the side wall portion 133 so as to face the armature 140 of the stator.

Next, in the fixing portion, the shaft 110 rotatably supports the hub-integrated sleeve 160 as described above. In addition, a dynamic pressure generating groove may be formed in each of the upper and lower outer diameter portions to inject the oil into the hub-integrated sleeve 160 at a small gap to form the fluid dynamic pressure bearing portion. In addition, the dynamic pressure generating groove may be formed in the inner diameter portion of the hub integral sleeve opposed to the shaft instead of being formed in the shaft.

In addition, the oil injected to form the hydrodynamic bearing part may have oil interfaces B1, B2, and B3 formed at minute intervals between the shaft 110 and the hub integrated sleeve 160. More specifically, the oil interfaces B2 and B3 are formed at the upper and lower portions of the central portion of the shaft by the communicating portion 161 'formed at the cylindrical portion 161 of the hub integrated sleeve 160, respectively.

In addition, the oil interface B1 is formed in a minute gap between the upper ends of the hub-integrated sleeve 160 opposite the upper portion of the shaft 110, as shown in the enlarged view.

The stopper 150 is mounted on the shaft 110 to face the rotating part. That is, it is coupled to the upper end of the shaft 110 to prevent the injury of the rotating part. To this end, the stopper 150 may have a protrusion 151 formed on an opposite surface of the hub integral sleeve, and a groove 161 ″ corresponding to the protrusion 151 may be formed in the hub integral sleeve.

In addition, the protrusion 151 of the stopper 150 may be formed in a variety of shapes, a plurality of may be formed at equal intervals in the circumferential direction, may be formed in the full range of the circumferential direction.

The shaft holder 120 has a shaft inserted into and fixed to an inner diameter portion, and a base is coupled to the outer diameter portion. In addition, an oil interface B4 may be formed between the shaft holder 120 and the hub integral sleeve.

An armature 140 made of a core 141 and a core 142 is fixedly coupled to the base 130 so as to face the magnet 170 of the rotating unit.

As such, the spindle motor according to the first embodiment of the present invention includes a hub-integrated sleeve, which simplifies the assembly process and increases productivity, and prevents the injuries of the rotating unit through the stopper coupled to the upper end of the shaft. At the same time, the oil interface can be managed before the stopper is mounted, which increases productivity because no oil management is required, and also prevents the outflow of oil through the stopper, resulting in a spindle motor with a more stable structure. have.

2 is a cross-sectional view schematically showing a spindle motor according to a second embodiment of the present invention. As shown, the spindle motor 200 is different only from the shaft holder and the base as compared to the spindle motor 100 shown in FIG.

More specifically, the spindle motor 200 includes a fixing unit including an armature 240 and a stopper 250 formed of a shaft 210, a base 220, a core 241, and a coil 242, and a hub integrated sleeve. 260 and the rotating part including the magnet 270, the fluid is filled with a working fluid is a fluid hydrodynamic bearing portion is formed between the rotating part and the fixed part.

That is, the spindle motor according to the embodiment of Figure 2 is integrally formed with the shaft holder and the base, thereby increasing productivity, and is implemented as a spindle motor of a more stable and robust structure.

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.

100: spindle motor 110: shaft
120: shaft holder 130: base
140: armature 141: core
142 coil 150 stopper
151: protrusion 160: hub integral sleeve
161: cylindrical portion 161 ': communication portion
161 ": Groove 170: Magnet
200: spindle motor 210: shaft
230: Base
240: armature 241: core
242: coil 250: stopper
260: integral hub sleeve 270: magnet

Claims

A rotating part including a hub integral sleeve and a magnet coupled to the hub integral sleeve;
A shaft for rotatably supporting the sleeve, a shaft holder in which the shaft is fixedly coupled, a base in which the shaft holder is coupled, an armature coupled to an outer circumference of the base so as to face the magnet, and an axial rotation of the shaft. A fixing part including a stopper coupled to the shaft so as to face each other and preventing an injury of the rotating part,
Spindle motor in which fluid hydraulic bearing is formed between the rotating part and the fixed part by injecting the working fluid oil.

The method according to claim 1,
And said stopper is coupled to an upper end of said shaft opposite said rotating part.

The method according to claim 1,
The stopper is a spindle motor, characterized in that the protrusion is formed on the opposite surface of the hub integral sleeve, the hub integral sleeve is formed with a groove corresponding to the protrusion.

The method according to claim 1,
A spindle motor, characterized in that an oil interface is formed in the microgap between the shaft and the upper end of the hub integral sleeve opposite the shaft.

The method according to claim 1,
Spindle motor, characterized in that the oil interface is formed between the shaft holder and the hub integral sleeve.

A rotating part including a hub integral sleeve and a magnet coupled to the hub integral sleeve;
A shaft for rotatably supporting the sleeve, a base to which the shaft is coupled, an armature coupled to an outer circumference of the base so as to face the magnet, and a shaft coupled to the shaft so as to face the rotating part in the axial direction of the shaft; It is made of a fixed portion including a stopper to prevent,
Spindle motor in which fluid hydraulic bearing is formed between the rotating part and the fixed part by injecting the working fluid oil.

The method of claim 6,
And said stopper is coupled to an upper end of said shaft opposite said rotating part.

The method of claim 7,
The stopper is a spindle motor, characterized in that the protrusion is formed on the opposite surface of the hub integral sleeve, the hub integral sleeve is formed with a groove corresponding to the protrusion.

The method according to claim 8,
A spindle motor, characterized in that an oil interface is formed in the microgap between the shaft and the upper end of the hub integral sleeve opposite the shaft.