KR20130077395A

KR20130077395A - Spindle motor

Info

Publication number: KR20130077395A
Application number: KR1020110146077A
Authority: KR
Inventors: 김주호
Original assignee: 삼성전기주식회사
Priority date: 2011-12-29
Filing date: 2011-12-29
Publication date: 2013-07-09

Abstract

PURPOSE: A spindle motor is provided to endure external impact by positioning a pressurizing member at the lower part of a cover combined with sleeve in the axial direction of a rotary shaft. CONSTITUTION: A rotating part comprises a rotary shaft, a hub, and a magnet (130). A sleeve (140) rotatably supports the rotary shaft. A base (150) combines with the sleeve. An armature (160) faces the magnet for being fixed and combined with the base. A fixing part comprises a cover (180) which supports the rotary shaft for combining with the lower part of the sleeve. A hydrodynamic bearing part is formed between the rotating part and fixing part. A fixing part comprises a pressurizing member (190). A pressurizing member pressurizes the lower part of the cover for being combined with the lower part of the sleeve.

Description

Spindle Motor

The present invention relates to a spindle motor.

In general, a spindle motor used as a driving 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 at the time of rotation of the motor. It is used in various ways.

More specifically, a spindle motor equipped with a fluid dynamic pressure bearing that maintains axial rigidity of the shaft only by the moving pressure of the lubricating oil by centrifugal force is based on the thrust force. Therefore, there is no metal friction, And it is mainly applied to high-end optical disc apparatuses and magnetic disc apparatuses, since the high-speed rotation of the rotating object is smoother than the motor having the ball bearing.

However, the spindle motor according to the related art having a hydrodynamic bearing part is vulnerable to this when the impact is applied in the axial direction of the rotating shaft, and the drawing force for this is required.

The present invention has been made to solve the above problems, by placing the pressing member in the lower portion of the cover coupled to the sleeve in the axial direction of the rotation axis, the holding force is improved by supporting the cover by the pressing member It is to provide a spindle motor capable of maintaining robustness against external shock.

The present invention relates to 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, an armature opposed to the magnet and fixedly coupled to the base, the armature comprising the core, and A spindle motor supporting a rotating shaft and including a cover coupled to a lower portion of the sleeve, the spindle motor being filled with oil and having a hydrodynamic bearing portion formed between the rotating portion and the fixed portion, wherein the fixed portion is provided with a lower portion of the cover. It further includes a pressing member coupled to the lower end of the sleeve while pressing.

In addition, the pressing member is formed in a ring shape and has both ends not connected to each other.

In addition, both ends are in contact with each other when coupled to the sleeve of the pressing member.

In addition, the pressing member is formed in a ring shape having a repeated bent portion.

In addition, the pressing member may be bonded or welded to the sleeve by a bonding agent.

In addition, the lower end portion of the sleeve to which the cover and the pressing member are coupled is gradually increased in inner diameter to form an inclined portion inclined upward in cross-sectional shape.

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 placing the pressing member in the lower portion of the cover coupled to the sleeve in the axial direction of the rotation axis, by holding the cover by the pressing member to improve the holding force and to maintain the robustness against external impact You can get a motor.

1 is a cross-sectional view schematically showing a spindle motor according to the present invention.
2 is a schematic view of the pressing member shown in FIG. 1, FIG. 2A is a plan view before assembly, and FIG. 2B is a plan view of an assembled state.
Figure 3 is a plan view schematically showing a pressing member according to another embodiment of 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, 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 the present invention. As shown, the spindle motor 100 includes a rotating part including a rotating shaft 110, a hub 120, and a magnet 130, a sleeve 140, a base 150, an armature 160, and a pulling plate 170. ), The cover 180 and the fixing member including the pressing member 190, the oil is a working fluid is injected into the fluid hydrodynamic bearing portion is formed between the rotating portion and the fixed portion.

In the rotating part, the rotating shaft 110 may be coupled to the hub 120 at an upper end thereof, and a flange 111 may be formed at the lower end thereof.

In addition, the hub 120 is a cylindrical portion 121 is fixed to the upper end of the rotating shaft 110, a disc portion 122 extending radially outward from the cylindrical portion 121, and the disc portion 122 It consists of a side wall portion 123 extending downward in the axial direction of the rotary shaft at the radially outer end of the seal, and a sealing portion 124 extending downward in the axial direction of the rotary shaft, opposing the outer peripheral portion of the sleeve.

In addition, the magnet 130 having an annular ring shape is mounted on the inner circumferential surface of the side wall part 123 so as to face the armature 160 including the core 161 and the coil 162.

Next, in the fixing part, the sleeve 140 supports the rotating shaft 110 to be rotatable, and the sleeve 140 is fixed to the base 150. In addition, the sleeve 140 has upper and lower dynamic pressure generating grooves 141 formed on an inner circumferential surface of the sleeve 140 opposite to the rotation shaft 110.

A minute gap is formed between the rotating shaft 110 and the sleeve 140, and oil is filled in the minute gap, and a radial dynamic bearing part RB is formed by the dynamic pressure generating groove 141. . In addition, the radial dynamic bearing may be formed on the upper and lower portions of the sleeve. In addition, the oil circulating hole 142 in the axial direction of the rotary shaft 110 to connect the upper and lower surfaces of the sleeve 140 so that the oil injected to form the hydrodynamic bearing portion circulates through the rotary shaft system in the sleeve 140. ) May be formed.

In addition, an armature 160 including the core 161 and the coil 162 is fixed to the outer circumferential portion of the base 150 by indentation or adhesion, and the inner circumferential portion of the base 150 is fixed to the outer circumferential portion of the base 150. The sleeve 140 is fixed by indentation or adhesion.

And the pulling plate 170 is to prevent the injuries of the rotating portion by the attraction of the magnet 130, is mounted to the base 150 so as to face the magnet 130 in the axial direction of the rotation axis.

The cover 180 is for sealing the oil injected to form the hydrodynamic bearing, and is coupled to the lower inner circumferential surface of the sleeve 140.

In addition, the pressing member 190 is coupled to the lower portion of the cover 180 with respect to the axial direction of the rotating shaft to press the cover 180 to improve the extraction force, the inner peripheral surface of the lower end of the sleeve 140 Combined.

In addition, the lower end portion of the sleeve 140 to which the cover 180 and the pressing member 190 are coupled is gradually increased in inner diameter so that only the restoration of the pressing member is performed as the inclined portion 143 having an upward inclined cross section is formed. The cover 180 is pressed upwards with respect to the axial direction of the rotating shaft.

In addition, the pressing member 190 may be bonded or welded by a bonding agent to be more firmly coupled to the sleeve.

As such, the spindle motor 100 according to the present invention includes a pressurizing member for pressurizing the cover, thereby improving the holding force and obtaining a spindle motor robust to external impact.

2 is a schematic view of the pressing member shown in FIG. 1, FIG. 2A is a plan view before assembly, and FIG. 2B is a plan view of an assembled state. As shown, the pressing member 190 is formed in a ring shape, and has both ends not connected to each other. And as shown in (b) of Figure 2, the pressing member 190 is located in the lower portion of the cover in a state in which both ends are pressed to contact and is coupled to the lower end of the sleeve, by the restoring force of the both ends of the The cover is pressed.

In addition, the cover is pressed by the restoring force of both ends, as the cover is pressed in the pressurized state even though both ends of the pressing member 190 are not in contact with each other.

3 is a plan view schematically showing a pressing member according to another embodiment of a spindle motor according to the present invention. As shown, the pressing member 290 is formed in a ring shape having a repeated curved portion 291.

In addition, the pressing member 290 may be bonded or welded by a bonding agent to be more firmly coupled to the sleeve.

In this way, the cover is pressed by an elastic force caused by the bent portion 291 as it is located below the cover and is coupled to the lower end of the sleeve.

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 scope of the invention as defined by the appended claims. It will be apparent that modifications and improvements can be made by those skilled in the art.

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: rotation axis
120: hub 121: cylindrical portion
122: disc portion 123: side wall portion
124: sealing portion 130: magnet
140: sleeve 150: base
160: armature 161: core
162: coil 170: pulling plate
180: cover 190, 290: pressing member

Claims

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, an armature opposed to the magnet and fixedly coupled to the base, the armature comprising a core and a coil, and supporting the rotating shaft. A spindle motor including a cover coupled to a lower portion of the sleeve, and filled with oil to form a hydrodynamic bearing part between the rotating part and the fixed part,
The fixing unit further comprises a pressing member coupled to the lower end of the sleeve while pressing the lower portion of the cover.

The method according to claim 1,
The pressing member
Spindle motor characterized in that it comprises both ends formed in a ring shape and not connected to each other.

The method according to claim 2,
Both ends are in contact with each other when coupled to the sleeve of the pressing member.

The method according to claim 1,
The pressing member
Spindle motor, characterized in that formed in a ring shape having a repeated bent portion.

The method according to claim 2 or 4,
The pressing member
Spindle motor, characterized in that bonded or welded to the sleeve by a bonding agent.

The method according to claim 1,
The lower end portion of the sleeve coupled to the cover and the pressing member is gradually increased in the inner diameter of the spindle motor, characterized in that the cross-sectional shape is inclined upwardly inclined.