KR20000002777U - Leakage prevention structure in motor - Google Patents

Abstract

The present invention prevents leakage in the motor, which allows the supporter to be double-pressed with the washer in the bearing housing when the supporter is fastened to the bearing housing at the same time as the outer peripheral end of the washer in the supporter is pressed into the bearing housing. As to the structure, in order to achieve the above object, the present invention provides a supporter insertion groove in the lower end of the bearing housing, and in the structure in which the supporter fixedly seated with the washer is press-fitted into the insertion groove,

Between the washer and the bearing housing contact surface of the upper part of the washer to form a concave-convex indentation respectively to prevent the leakage of oil in the bearing housing double when the supporter is press-fitted to completely prevent the leakage of bearing oil from the bearing housing This prevents bearing damage due to unnecessary consumption of oil or consequently increased mechanical friction, and increases the service reliability of the machine while extending the endurance life of the motor.

Description

Leakage prevention structure in motor

The present invention relates to a structure for preventing oil leakage in a motor, and more particularly, to a structure for preventing oil leakage in a small motor using a bearing supporting a rotating shaft as a metal bearing.

In general, a motor used for driving a device in a device such as a CD-ROM driver, a floppy disk driver, and a hard disk driver is a very small motor, and a bearing is provided to support a rotating shaft in such a small motor.

As the bearings used in such a small motor as described above, metal bearings have been replaced as ball bearings or bearings have recently been required to have high speed and precision.

Metal bearings are commonly referred to as sintered bearings, in which powder alloys are formed into arbitrary cylindrical shapes and then sintered to impregnate oil. These bearings are spaced apart at regular intervals within the bearing housing so that they are provided at the upper and lower portions, respectively. Let's do it.

1 is a cross-sectional view showing an example of a motor to which the metal bearings are applied as described above. The metal bearings 1 are fixedly mounted at upper and lower portions in the bearing housing 2, respectively, and the centers of the upper and lower bearings 1 are respectively shown. The rotary shaft 3 is supported by the shaft. The stator core 4 is fastened to the upper outer circumferential surface of the bearing housing 2, and the base 6 to which the PCB substrate 5 is attached is fixedly coupled to the lower outer circumferential surface of the bearing housing 2, and the rotary shaft is supported by the upper and lower bearings 1. (3) The rotor 8 with the drive magnet 7 attached thereto is axially fixed on the upper portion.

In this structure, when power is supplied to the coil of the stator core 4, the magnetic field is formed between the magnet 7 and the rotor 8 rotates together with the magnet 7, and at the same time, the rotor 8 and the shaft are fixed. The rotating shaft 3 rotates, and at this time, oil is ejected from the sleeve surface of the upper and lower bearings 1 supporting the rotating shaft 3 to greatly alleviate the friction action with the rotating shaft 3.

On the other hand, the lower end of the bearing housing 2 in which the upper and lower bearings 1 are axially fixed is opened downward so that the open end is sealed by the supporter 9 as shown in FIG.

That is, the lower end of the bearing housing 2 is formed so that a portion of the inner circumferential portion is narrowly recessed, and the supporter 9 has a flat washer 10 for supporting the lower end of the rotation shaft 3 at the center of the upper surface thereof, so that the outer circumferential end thereof is formed. It is to be joined by the sealing means while being inserted into the recess in the lower end of the bearing housing (2).

However, the supporter 9 as described above is coupled to allow the outer peripheral end of the supporter 9 to be press-fitted into the recess of the small diameter formed at the bottom of the bearing housing 2, so that the contact area of each other is narrow and the materials between the contacts are different. As the bonding force is lowered by the bonding means, there is a disadvantage in that the sealing force is not good.

This disadvantage is that the oil leakage through the joint eventually causes a problem of the durability of the motor due to the lack of oil.

Accordingly, the present invention is to solve the above problems and disadvantages, and for this purpose, the present invention allows the supporter to double with the washer in the bearing housing so that the outer peripheral end of the washer in the supporter is simultaneously pressed into the bearing housing when the supporter is fastened to the bearing housing. The main purpose is to allow a more complete oil shielding by press-fitting into.

In order to achieve the above object, the present invention provides a supporter insertion groove at a lower end of a bearing housing, and in the structure in which the supporter having a washer fixedly seated is inserted into the insertion groove,

Between the washer and the bearing housing contact surface of the upper portion of the washer is formed by the concave-convex indentation respectively, it characterized in that the configuration to block the leakage of the oil in the bearing housing during the press-in of the supporter.

1 is a cross-sectional structural view of a small motor to which a metal bearing is applied,

2 is an enlarged view illustrating a main part of a state in which a conventional supporter is coupled;

Figure 3 is a main part showing an embodiment coupling structure of the supporter according to the present invention,

Figure 4 is a main part showing a coupling structure of another embodiment of the supporter according to the present invention.

Explanation of symbols for main parts of the drawings

10: bearing housing 11: supporter insertion groove

12,31: groove 13,32: protrusion

20: supporter 30: washer

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

3 shows an embodiment according to the present invention, reference numeral 10 denotes a bearing housing, and reference numeral 20 denotes a supporter.

The bearing housing 10 has a pair of metal bearings for supporting the rotating shaft therein and attached to the upper and lower portions thereof, and an insertion groove 11 for allowing the supporter 20 to be press-fitted is provided at the lower end thereof. In addition, the supporter 20 is coupled by inserting the washer 30 supporting the lower end of the rotation shaft in the upper part and press-fitting into the insertion groove 11 of the lower end of the bearing housing 10.

The present invention in such a coupling structure is to make the inner diameter of the insertion groove (11) and the outer diameter of the supporter 20 of the lower end of the bearing housing 10 larger than before, washer 30 and the bearing housing (seeded on the supporter 20) By forming a separate indentation structure between the inner circumferential surface of the insertion groove 11 of 10) is to enable a double coupling when the supporter 20 is coupled to the bearing housing (10).

For the press-fit structure, the washer 30 and the bearing housing 10 are provided with concave-convex shapes to face each other, and the concave-convex shape has an outer peripheral end portion of the washer 30 as shown in FIG. The supporter 20 protrudes higher than the outer circumferential end to form the protrusion 21, and the supporter 20 is inserted into the upper portion of the protrusion 21 when press-fitted into the insertion groove 11 of the bearing housing 10. (11) On the inner circumferential surface, the groove 12 is formed to have a concave structure for allowing the projection 31 to be press-fitted or the groove 32 is recessed to the outer circumferential end of the washer 30 as shown in FIG. In addition, a protrusion 13 may be protruded from the inner circumferential surface of the insertion groove 11 of the bearing housing 10 into which the washer 30 is press-fitted and face-contacted. .

That is, when oil is ejected from the inner circumferential surface side sleeve surface of the bearing through which the rotating shaft 50 supported by the metal bearing 40 passes, and the smooth driving of the rotating shaft 50 is performed, the oil ejected from the sleeve surface is transferred to the bearing housing. Once gathered at (10), the oil leakage flow is blocked by the press-fit structure composed of the grooves 12 and 32 and the projections 13 and 31 between the bearing housing 10 and the washer 30, and again the bearing housing ( The leakage flow from the bearing housing 10 can be more completely blocked by blocking the leakage flow by the press-fit structure between the 10 and the supporter 20.

For example, the present invention simply presses the supporter into the insertion groove of the bearing housing, and the bearing housing 10 and the washer 30 are also mutually press-fitted by a simpler structure improvement of the conventional structure resulting in a decrease in the sealing force between the bearing housing and the supporter. By being coupled to the bearing housing 10 and the supporter 20 it is possible to further reinforce the shielding force degradation caused by the structure that is press-fitted only in one place.

This reinforcing structure is designed to compensate for the loss caused by the lack of coupling force between the bearing housings and the supporters of different materials, thus providing a smooth rotational drive by preventing more leaks, and shortening the service life of the motor due to the lack of oil. Can be prevented.

Therefore, the coupling structure according to the present invention can more completely prevent the leakage of bearing oil from the bearing housing, and can prevent bearing damage due to unnecessary consumption of oil and subsequent increase in mechanical friction.

In addition, the above results can extend the service life of the motor has a very useful effect that can significantly increase the reliability of use of the device.

Claims (3)

The lower end of the bearing housing is provided with a supporter insertion groove, the support groove in which the washer is fixed and seated in the insertion groove is a structure that is press-fitted, And a convex and concave convexity formed between the washer and the bearing housing contact surface of the upper part, respectively, to prevent leakage of oil in the bearing housing when the supporter is press-fitted. The method of claim 1, The concavities and convexities are formed to protrude upwardly from the outer circumferential end of the supporter to the outer circumferential end of the washer, and a groove for allowing the protrusion to be pressed into the bearing housing on the upper portion thereof is characterized in that Leakage prevention structure in the motor. The method of claim 1, Said unevenness is a structure for preventing leakage in a motor, characterized in that a recess is formed in the outer circumferential end of the washer, and a protrusion is formed in the bearing housing of the upper portion so as to protrude into the groove.