KR20050000198A - structure for preventing a flotation of the spindle motor - Google Patents

Abstract

PURPOSE: A structure for preventing a spindle motor from being lifted is provided to form an attraction magnet for preventing a rotor case and a turntable from being lifted, and a stopper for preventing a rotary shaft from being away from a right position in one structure so that it simplifies the structure of a spindle motor. CONSTITUTION: The structure comprises a rotary shaft(4), a rotor case(2), a stator(1), a bearing, an elastic member(10), and a thrust washer(20). The rotary shaft(4) is inserted into a center of a turntable. The rotor case(2), having a magnet adhered to an inner wall, is rotated with the rotary shaft(4). The stator(1) has coils wound for having interaction with the magnet of the rotor case(2), and makes the rotary shaft pass through the center. The bearing is fixed to the stator(1), and supports the rotation of the rotary shaft(2). The elastic member(10), installed in the rotary shaft(4), pushes an elastic force on the bearing. The thrust washer(20) contacts a bottom of the bearing closely to a top of the elastic member for reducing a friction when the elastic member(10) is rotated with the rotary shaft(4).

Description

Structure for preventing a flotation of the spindle motor

The present invention relates to a structure for preventing the floating of a spindle motor, and more particularly, to a spindle motor having an elastic spring support structure capable of simultaneously implementing a suction force magnet of a spindle motor for driving a disk in one direction and a stopper function below the rotating shaft. It relates to an injury prevention structure.

In general, an optical disc player such as LDP, CDP, CD-ROM, DVDP, DVD-ROM, etc. clamps a mounting hole formed in the center of the disc as a clamping unit while loading the disk onto the turntable by a loading mechanism. To fix it. The disk clamped to the chuck is an apparatus for reproducing information recorded on the disk by an optical pickup unit which rotates in one direction by a drive source of a spindle motor as a driving means and moves in the radial direction.

1 is a perspective view illustrating a spindle motor employed in a general optical disc player, and FIG. 2 is an assembled cross-sectional view illustrating the spindle motor of FIG. 1. As shown in FIGS. 1 and 2, the conventional spindle motor 120 corresponds to a chuck 110 for clamping a disk, a stator 121 having a coil 121a wound a plurality of times, and the stator 121. An upper end of the rotor case 122 having the driving magnet 123 integrally mounted on the inner side of the rotor case 122 and the rotor case 122 to which the chuck 110 is fixed are integrally assembled to the stator 121. It consists of a rotating shaft 124 rotatably supported through the bearing member 126 is received.

In addition, the stator 121, the PCB 130 is fixed to the base plate 140 made of a metal material, the base plate 140 is rotated with the rotor case 122 when the power is applied to the rotating shaft 124 The shaft holder 125 is mounted to support the lower end of the shaft holder 125.

Accordingly, when the power is supplied to the spindle motor 100 having the above-described configuration, the rotor case 122 is rotated by the electrical action of the stator 121 and the driving magnet 123, and the rotation shaft 124 is also present. While rotating the disk clamped to the chuck 110 while being rotated, the optical pickup unit provided in the optical disk player is moved in the radial direction of the disk to reproduce the information on the disk.

Meanwhile, in the shaft holder 125 provided below the rotating shaft 124, a circular injection molded product or a plate may be circular to support the lower end of the rotating shaft 124 rotated in one direction together with the rotor case 122. A support member, such as a press washer 127, is press fit and assembled. An annular ring groove 124a formed at the lower end of the rotating shaft 124 is provided with an E-ring 124b.

The spindle motor 120 as described above functions to rotate the turntable T by rotating the rotary shaft by the interaction of the coil and the magnet. In this case, a structure for preventing the rotor case 122 coupled with the rotation shaft from rising upward by the rotation of the rotation shaft is adopted. That is, it is connected to the stator 121 and the suction force magnet 129 is installed above the bearing 126 to apply the force to pull the rotor case 122 downward. The suction force magnet 129 is bent to 90 degrees and is mounted to the magnet support yoke 139 formed to allow the magnet 129 to be positioned in position.

In addition, a ring groove 124a is formed at the lower end of the rotation shaft 124 together with the suction force magnet as described above, and a stopper member such as an E-ring 124b is fitted in the ring groove 124a to raise the rotation shaft upward. This prevents it from falling out of position.

However, the structure as described above for preventing the injury of the rotating shaft and the rotor case should form a stopper structure on the suction force magnet and the rotating shaft when the spindle motor is manufactured, and for this purpose, the structure becomes complicated because the yoke 139 must be formed. There is. In addition, the manufacturing of the yoke with the precision enough to fix the magnet to the yoke 139 as described above is also difficult in the process.

In addition, the suction magnet as described above has a problem that the torque of the overall motor is lowered by pulling the rotor case downward, thereby increasing the amount of current applied to the motor and lowering the RPM below the expected value.

The present invention is to solve the above problems, the suction force magnet to prevent the injury of the structure, such as the rotor case of the spindle motor and the turntable of the upper, and the function of the stopper for preventing the rotation axis from moving out of position The object of the present invention is to provide a spindle motor floating prevention structure that can simplify the structure of the spindle motor.

In addition, an object of the present invention is to provide a spindle motor injury prevention structure that can prevent the yoke, which is a complex structure for mounting the magnet inside the rotor case to prevent interference between the internal components and structures when assembling the motor. .

In addition, an object of the present invention is to provide a spindle motor floating prevention structure that can reduce the manufacturing cost of parts by using a leaf spring that is relatively inexpensive than the magnet.

1 is a perspective view of a conventional spindle motor used in an optical disc player.

2 is a cross-sectional view of the spindle motor of FIG.

3 is a cross-sectional view of the spindle motor according to the present invention.

4 is a cross-sectional view (a) and a plan view (b) of the elastic member used in the spindle motor of FIG.

5 is a perspective view of a state in which the elastic member of FIG. 4 is mounted on a rotating shaft.

6 is a cross-sectional view showing a state in which another elastic member used for the spindle motor according to the present invention is mounted on the rotating shaft.

7 is a cross-sectional view (a) and a plan view (b) of another elastic member used in the spindle motor of FIG.

8 is a perspective view illustrating a state in which the elastic member of FIG. 7 is mounted on a rotating shaft.

Explanation of symbols on the main parts of the drawings

1: stator 2: rotor case

4,34: rotating shaft 5: coil

6: magnet 7: substrate

8: base plate 9: shaft holder

10, 30, 50: elastic member 11, 31, 51: leaf spring

12,32,52: Base 20: Trust washer

35: groove 36: protrusion

As a construction means for achieving the above object, the present invention is a floating structure of the spindle motor for rotating the turntable for supporting the disk, the rotation shaft is inserted into the center portion of the turntable to rotate integrally with the turntable; A magnet case attached to an inner side, the rotor shaft inserted into a central portion thereof, and a rotor case rotating integrally with the rotary shaft; A stator having a coil wound to interact with the magnet of the rotor case, and a stator inserted into the center thereof so that the rotation shaft is rotatable; A bearing fixed to the stator and arranged between the stator and the rotation shaft to support rotation of the rotation shaft; An elastic member mounted to the rotating shaft and positioned to provide an elastic force toward the bearing at a lower side of the bearing; And a thrust washer mounted to contact the lower end of the bearing and the upper surface of the elastic member, and a thrust washer for reducing friction when the elastic member is integrally rotated along the rotating shaft. to provide.

Preferably, the elastic member is characterized in that the leaf spring.

Preferably, the leaf spring comprises a ring-shaped base mounted on the outer periphery of the rotary shaft and at least two elastic plates that are bent toward the bearing, more preferably the elastic plates are four and uniform with each other. Characterized in that arranged at one interval.

Preferably, the base is fitted to the rotary shaft, and preferably the groove is formed in the rotary shaft of a predetermined depth along the outer circumference, the base is formed with a ring-shaped protrusion projecting toward the rotary shaft, The protrusion of the base is inserted into and fixed to the groove of the rotation shaft.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 3 is a cross-sectional view of the spindle motor according to the present invention. The spindle motor of FIG. 3 is characterized in that the elastic member 10 is used instead of the conventional suction force magnet and stopper structure.

In FIG. 3, the rotation shaft 4 is inserted in the center of the turntable T as in FIGS. 1 and 2, and transmits the rotation of the motor to the turntable. The rotary shaft 4 has a cylindrical shape having a predetermined diameter, and the rotor case 2 and the stator 1 are inserted into the rotary shaft 4.

The rotor case 2 is an upper case of the spindle motor, in which a magnet 6 is mounted. The rotary shaft 4 is inserted into the central portion of the rotor case 2, and the rotary shaft 4 and the rotor case 2 are connected to be integrally rotated with each other. The rotating shaft is inserted into the center portion of the rotor case (2).

The stator 1 constitutes the inner portion of the rotor case 2 and the lower base portion of the spindle motor, and the coil 5 which interacts with the magnet 6 attached to the inner side of the rotor case 2 to generate rotational force. ) Is wound. The coil 5 rotates the rotor case 2 and the rotating shaft to which the magnet 6 is attached by electromagnetic force.

On the other hand, the stator 1 is integrally formed with a base plate 8 that forms a lower structure of the motor, and the base plate 8 is arranged with a substrate 7 for forming various components and circuits.

In the central portion of the stator 1 is inserted a rotatable shaft 4 rotatable. A bearing 3 is located between the rotational shaft 4 and the stator 1, and the bearing 3 functions to support the rotational shaft 4 in the stator 1. The bearing 3 is fixedly mounted to the stator 1 and may be of any structure that supports the rotation of the rotating shaft. In particular, a lubricating component is contained between the rotating shaft and the bearing, and a cylindrical one made of a material capable of functioning as a bearing can be used.

The elastic member 10 is positioned on the lower side of the bearing 3 to impart an elastic force toward the bearing. The elastic member 10 is mounted to the rotation shaft (4). The elastic member 10 is preferably mounted to rotate integrally with the rotating shaft 4, the plate spring 11 is connected to the base 12 and the base 12 to be mounted to the rotating shaft (4) Is formed.

4 is a view showing the elastic member 10 as described above, Figure 5 is a perspective view of a state in which the elastic member of Figure 4 is mounted on a rotating shaft. As shown in (a) of FIG. 4, the base 12 is formed to be inserted into the rotation shaft 4 in a ring shape, and the leaf spring 11 is bent at an angle toward the upper side, and then again downward It is bent and formed so that the peak part may face the lower end part of a bearing.

In order to use such an elastic member 10, the thrust washer 20 is mounted on the upper surface of the elastic member 10. The thrust washer 20 is mounted to contact the lower end of the bearing 3 and the upper surface of the elastic member. The thrust washer 20 is for reducing friction when the elastic member rotates integrally along the rotation axis. That is, the thrust washer 20 functions to reduce friction generated because the elastic member 10 rotates together along the rotation axis.

4B is a plan view of the elastic member 10, in which four leaf springs 11 are arranged at uniform intervals. At least two leaf springs 11 are arranged, and as shown in FIG. 4 (b), four are arranged more preferably in terms of even transmission of elastic force and relaxation of impact force.

In addition, the elastic member as described above may also be used in the same structure as in FIG. As shown in (a) and (b) of FIG. 7, an elastic leaf spring 51 which is radially cut to a predetermined thickness and bent upward is formed, and a base portion 52 inserted into the rotation shaft 4 is provided. It is also formed. 8 is a perspective view illustrating a state in which the elastic member 50 is mounted on the rotation shaft 4.

4 and 5 and 7 and 8, the elastic members 10 and 50 are mounted in the interference fitting type on the rotation shaft 4. That is, the diameter of the base 12, 52 is formed to a diameter slightly smaller than the diameter of the rotation shaft 4, the elastic member is fixed by fitting the base (12, 52) to the rotation shaft (4).

In addition, the elastic members 10 and 50 may be bonded to the rotating shaft by welding or the like, and one side end may be inserted into the rotating shaft as shown in FIG. 6. 6 is a cross-sectional view showing a state in which the other elastic member 30 used for the spindle motor according to the present invention is mounted on the rotating shaft.

In FIG. 6, the elastic member 30 includes a projection 36 in which the leaf spring 31 contacts the upper thrust washer 20 and the base 32 protrudes inwardly toward the rotation shaft 4. do. The protrusion 36 of the base is inserted into the groove 35 formed in the rotation shaft 4. That is, the groove 35 is formed in the circumferential direction on the outer circumferential surface of the rotation shaft 4, and the protrusion 36 is inserted into the groove 35. This is an appropriate structure that can prevent the flow of the elastic member up and down.

Referring to the operation of the spindle motor injury prevention structure according to the present invention as described above with reference to the drawings.

3 to 8, when a current is supplied to the coil 5 wound on the stator 1, the coil 5 interacts with the magnet 6 attached to the rotor case 2 to rotate the magnet. . Accordingly, the rotor case 2 to which the magnet 6 is attached rotates together, and the rotation shaft 4 inserted into the rotor case rotates together to rotate integrally with the rotor case 2.

The rotating shaft 4 is supported by the base 3 attached to the stator 1 to rotate, and is fixed in a structure capable of moving up and down. Accordingly, the rotor case 2 and the rotating shaft 4 are displaced upwards during the rotation of the motor, and the elastic members 10, 30, and 50 are disposed below the rotating shaft 4 to prevent the rotor case 2 from injuring. Is fitted.

The elastic members 10, 30, and 50 are arranged with the thrust washer 20 interposed between the lower parts of the bearings 3, and the bearings fixed to the stator 1 when the rotating shaft 4 rises while rotating ( Elastic contact with the washer located in the lower part of 3). Therefore, the elastic members (10, 30, 50) is to function as a stopper so that the rotating shaft (4) does not deviate from the correct position.

In addition, as well as the function of the stopper, it performs a suction force function that acts as a shock absorbing function to cancel the force that the rotation axis is going to rise with the elastic force with the lower end of the bearing. Therefore, the conventional stopper function and the suction force function can be solved through one structure, such as a structure for installing the elastic member on the rotating shaft, it is possible to provide a spindle motor using a simpler structure.

According to the present invention as described above, the spindle by solving the function of the suction magnet to prevent the injury of the structure, such as the rotor case of the spindle motor and its turntable, and the stopper for preventing the rotation axis from deviating from the fixed position in one structure There is an effect to provide a new spindle motor anti-floating structure that can simplify the structure of the motor.

In addition, the present invention can omit the yoke, which is a complex structure for mounting the magnet inside the rotor case, there is an effect that can prevent the interference between the internal components and structures when assembling the motor.

In addition, the present invention can provide a spindle motor floating prevention structure that can reduce the manufacturing cost of the parts by using a leaf spring that is relatively inexpensive than the magnet.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (6)

In the anti-floating structure of the spindle motor for rotating the turntable supporting the disk, A rotating shaft inserted into a central portion of the turntable to rotate integrally with the turntable; A magnet case attached to an inner side, the rotor shaft inserted into a central portion thereof, and a rotor case rotating integrally with the rotary shaft; A stator having a coil wound to interact with the magnet of the rotor case, and a stator inserted into the center thereof so that the rotation shaft is rotatable; A bearing fixed to the stator and arranged between the stator and the rotating shaft to support rotation of the rotating shaft; An elastic member mounted to the rotating shaft and positioned to provide an elastic force toward the bearing at a lower side of the bearing; And And a thrust washer mounted to contact the lower end of the bearing and the upper surface of the elastic member, the thrust washer for reducing friction when the elastic member is integrally rotated along the rotating shaft. 2. The floating prevention structure of a spindle motor according to claim 1, wherein the elastic member is a leaf spring. 3. The floating prevention structure of a spindle motor according to claim 2, wherein the leaf spring includes a ring-shaped base mounted on an outer circumference of the rotating shaft and at least two elastic plates bent toward the bearing. 4. The floating prevention structure of a spindle motor according to claim 3, wherein the elastic plates are four and are arranged at equal intervals from each other. 4. The floating prevention structure of a spindle motor according to claim 3, wherein the base is fitted to the rotating shaft. According to claim 3, The rotary shaft is formed with a groove having a predetermined depth along the outer periphery, The base is formed with a ring-shaped protrusion protruding toward the rotary shaft, The protrusion of the base is inserted into the groove of the rotary shaft Floating prevention structure of the spindle motor, characterized in that fixed.