KR20000003012U - Leakage prevention structure in CD-ROM motor - Google Patents

Abstract

The present invention further extends the upper end of the sleeve of the base so that the upper part of the bearing is completely covered, and the lower end of the contact surface with the supporter which is pressed into the lower end of the sleeve as a sealing means while filling the oil into the sleeve and the supporter to drive the motor continuously. The present invention relates to a structure for preventing leakage in a CD-ROM motor, which can prevent a loss of oil and reduce mechanical friction of a bearing, thereby prolonging the life of the bearing and the motor. The base 10 to which the stator 12 is bound to the outside of the silver tube-shaped sleeve 11, and the cup-shaped supporter 13 is press-fitted to the lower end of the sleeve 11, and the magnet 21 is formed on the outer circumference. A rotor 20 having a rotating shaft 22 fixedly installed at a center thereof, and an outer peripheral surface of the rotating shaft 22 of the rotor 20. In the motor configuration consisting of a metal bearing 30 inserted between the inner circumferential surface of the sleeve 11 of the base 10 so as to connect freely therebetween, the upper end of the sleeve 11 is extended to the upper portion of the metal bearing The upper end of the 30 is completely covered, and the lower end of the contact surface between the sleeve 11 and the supporter 13 is shielded as a sealing means 40, and the sleeve 11 and the supporter 13 in which the metal bearings 30 are embedded. The inside of the liver is filled with oil 50, thereby preventing the consumption of oil and mechanical friction of the bearing to extend the service life of the motor is characterized by.

Description

Leakage prevention structure in CD-ROM motor

The present invention relates to a leakage preventing structure of a CD-ROM motor, and more particularly, to prevent leakage of bearing oil from scattering and leakage when driving a motor in a compact spindle motor applied to a CD-ROM. It's about structure.

Currently, the motors used in CD-ROMs use very small spindle motors. The bearings supporting the rotor in such small motors generally use metal bearings (also called sintered bearings) rather than ball bearings. to be. Metal bearings are manufactured by sintering by forming a number of voids in the sintered body to communicate with the outside, and impregnating lubricating oil in the sintered body. To lubricate.

Such a metal bearing is generally formed in a cylindrical shape as shown in FIG. 1 so that the rotating shaft 210 of the motor is inserted into the inside, and the outside thereof is covered by the sleeve 110 which is a tubular shape of the base 100. The cap-shaped supporter 130 is press-fitted to the lower end of the sleeve 110. In addition, a coil wound around the stator 120 is attached to the outer circumferential surface of the sleeve 110, and a rotor 200 for attaching the magnet 220 to the outer circumference of the rotary shaft 210 is axially supported to constitute a motor. Done.

Meanwhile, when the power is applied to the stator 120 and the rotor 200 starts to rotate in the above-described structure, oil is extracted from the metal bearing 300 to allow the rotation shaft 210 to smoothly rotate. At this time, the oil taken out from the metal bearing 300 is collected in a cup-shaped supporter 130 is pushed down to the lower end of the sleeve 110.

However, when the lubrication action by the metal bearing 300 is maintained for a long time, oil extracted from the metal bearing 300 is finely scattered through the open upper end of the sleeve 110 or between the sleeve 110 and the supporter 130. The metal bearing 300 leaks between the contact surfaces, resulting in a shortage of oil and a shortage of air. When the oil starts to be consumed finely, the friction coefficient in the bearing is increased and the bearing wear is promoted. This causes a premature failure of the motor, thereby shortening the service life of the motor.

The present invention is to improve the above disadvantages and problems, the present invention is to extend the upper end of the sleeve of the base so that the bearing top is completely covered, the lower end of the contact surface with the supporter is pressed into the inside of the sleeve lower end as a sealing means The main purpose of the shielding is to fill oil into the sleeve and the supporter to prevent oil loss due to the continuous driving of the motor, and to reduce the mechanical friction of the bearing, thereby extending the life of the bearing and the motor.

In addition, the present invention has another purpose to improve the driveability of the rotating shaft and the rotor by increasing the hydraulic pressure in the sleeve and the supporter when driving the motor.

1 is a cross-sectional structural view of a conventional cd rom motor,

2 is a cross-sectional structure diagram of a cdrom motor according to the present invention.

Explanation of symbols for main parts of the drawings

10: base 11: sleeve

13: supporter 20: rotor

22: rotating shaft 30: metal bearing

40: sealing means 50: oil

As a means for achieving the above object, the present invention provides a base for allowing the stator to be bound to the outside of the tubular sleeve and a cup supporter press-fitted to the lower end of the sleeve, and a magnet attached to the outer circumferential portion thereof, with a rotating shaft fixed at the center thereof. In a motor configuration consisting of a rotor configured to be built up and a metal bearing inserted between the outer peripheral surface of the rotary shaft of the rotor and the inner peripheral surface of the sleeve of the base to enable free rotation therebetween,

The upper end of the sleeve extends upwards to completely cover the upper end of the metal bearing, and the lower end of the contact surface between the sleeve and the supporter is sealed as a sealing means, and oil is filled into the sleeve and the supporter in which the metal bearing is embedded. The configuration is characteristic.

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention.

2 is a cross-sectional view of an embodiment of the present invention, wherein the base 10 of the present invention is provided with a base 10 which is a fixed part of a motor and a rotor 20 that is a rotating part, and a metal bearing 30 connecting them. The sleeve 11 and the cap 11 supporter 13, which are pressed into the lower end of the sleeve 11 and the sleeve 11, which are attached to the sleeve 11 and protrude upward, are integrally assembled or assembled, and the rotor ( 20, a mast net 21 is attached to the outer circumference, and the rotating shaft 22 is fixedly laid at the center thereof, and the free rotation thereof is possible between the inner circumferential surface of the sleeve 11 and the outer circumferential surface of the rotating shaft 22. The configuration to insert the metal bearing 30 is the same as before.

In the above configuration, the present invention extends the upper end of the sleeve 11 to the upper portion, but allows the upper portion of the metal bearing 30 to be completely covered while being higher than the upper end of the metal bearing 30. In other words, the upper portion of the metal bearing 30 is formed to cover the upper portion of the metal bearing 30 while forming only a hole penetrating only the rotating shaft 22 in the upper portion of the metal bearing 30, and thus a minute amount of the bearing through the upper portion of the metal bearing 30. To prevent the oil from scattering.

In addition, the sealing means 40 is applied to the lower end of the contact surface 13 of the sleeve 11 and the supporter 13 press-fitted into the inner circumferential surface of the lower end of the sleeve 11 so that the airtightness between the sleeve 11 and the supporter 13 is completely sealed. To be maintained.

On the other hand, as the sealing means 40, it is most preferable to use an adhesive of bond or caulking.

As described above, the oil 50 is filled in the interior space of the metal bearing 30 which is almost shielded from the outside by the extension of the upper end of the sleeve 11 and the contact surface sealing of the sleeve 11 and the supporter 13.

When the connection structure formed by the metal bearing 30 is formed in the above configuration, oil can always be sufficiently maintained inside the space in which the metal bearing 30 is embedded, so that the operability of the metal bearing 30 can be smoothly maintained at all times. Even when the rotating shaft 22 with the rotor 20 rotates, the upper portion of the metal bearing 30 is covered by the upper end of the extended sleeve 11 and the lower surface is the contact surface between the sleeve 11 and the supporter 13. Since it is shielded by the sealing means 40 applied to the liver, it is possible to prevent unnecessary consumption of the oil while preventing the oil from being scattered or spilled as before.

In particular, when the oil filled therein and the rotational action of the rotating shaft 22, the internal hydraulic pressure is increased, thereby not only significantly reducing the mechanical friction in the metal bearing 30, but also increasing the driveability of the rotating shaft 22. Let's go.

According to the configuration as described above, it is possible to prevent the continuous oil consumption in the motor and the mechanical friction of the metal bearing 30 according to the present design, which can significantly extend the service life of the motor and at the same time improve the motor You can expect same-sex.

In addition, since the oil is prevented from being scattered or spilled as before, it also provides an advantage of keeping the inside and outside of the motor clean at all times.

In particular, this configuration is very effective in improving the merchandise and reliability of the device by preventing the failure of the device due to the motor.

Claims (2)

The base 10 to which the stator 12 is bound to the outside of the tubular sleeve 11 and the cup supporter 13 is pressed into the lower end of the sleeve 11 and the magnet 21 is attached to the outer circumference. And a rotor 20 in which the rotating shaft 22 is fixedly installed at the center, and is inserted between the outer peripheral surface of the rotating shaft 22 of the rotor 20 and the inner peripheral surface of the sleeve 11 of the base 10, thereby allowing free rotation between them. In the motor configuration consisting of a metal bearing 30 that connects easily, The upper end of the sleeve 11 extends upward to completely cover the upper end of the metal bearing 30, and the lower end of the contact surface between the sleeve 11 and the supporter 13 is shielded as a sealing means 40, and the metal bearing Leakage prevention structure in the CD-ROM motor, characterized in that the oil (50) is filled in between the sleeve (11) and the supporter (13) is built. The method of claim 1, The sealing means 40 is leak-proof structure in the CD-ROM motor, characterized in that the composition is applied to the adhesive of the bond or caulking.