JP3128441U - cooling fan - Google Patents

Abstract

The present invention provides a structure of a fan shaft base that is low in noise and hardly generates heat.
A base 11, a shaft 2, a shaft holding base 31, a ring 233, and an oil-impregnated bearing 321, an insulating frame 41, a silicon steel plate 42, and a circuit board 5 are fixed and supported by the base 11, and a shaft The structure of the cooling fan is configured to be rotatable by supporting the shaft 2, the magnet 61, the motor case 6, and the blades 7 via the bearings 321.
In these structures, the shaft 2 comes into contact with the shaft holding base 31 at the point of the spindle-shaped shaft upper end 21, and since the friction area between the two is small, the frictional force becomes relatively small and the rotation can be performed more smoothly. It is low in noise and hardly generates heat.
[Selection] Figure 1

Description

The present invention relates to a structure of a shaft base of a cooling fan for air cooling such as a semiconductor device. In particular, the shaft holding base is configured by combining a shaft having a cone-shaped end. In this point, the frictional area between the two is reduced, the frictional force between them is relatively small, the frictional force is relatively small, the rotation can be performed more smoothly, the noise is low, and heat is not easily generated. Concerning structure.

The application range of the cooling fan is extremely wide, and it is indispensable to install the cooling fan in the CPU, power supply, etc. in the computer. If the cooling fan cannot provide the cooling function, the equipment cannot operate normally. The normal operation of the cooling fan has a great influence on the function of the equipment.

As shown in FIG. 3, the structure of the cooling fan according to the prior art is such that the shaft 2 is pivotally installed at a central position of the motor stator by a ball bearing 322. The ball bearing 322 is a point-like contact, and the rotation at the start-up is smooth. However, noise is generated when the metal ball of the ball bearing 322 rotates, and the cost is high. On the other hand, some oil-impregnated bearings are used, but the cost of this type of bearing is low, but after a long period of use, the inner diameter of the bearing is not a right cylinder due to wear, and noise and frictional resistance gradually increase.

There are drawbacks in the structure of the fan bearing according to the prior art, and if the above-mentioned drawbacks can be solved, a more suitable structural strength can be obtained, which is what the user desires. In view of the shortcomings of the conventional fan bearing structure, the inventor of the present invention felt the need for improvement, and finally devised the present invention with a simple structure and high durability through years of experience, research and improvement. did.
Japanese Patent Laid-Open No. 2004-159931

The purpose of the present invention is that the shaft contacts the shaft holding base at the point of the spindle-shaped shaft, the friction area between them is small, the frictional force is relatively small, and the rotation can be performed more smoothly. The object is to provide a structure of a fan shaft base that is low in noise and hardly generates heat.

In order to solve the above-mentioned problems, the invention of claim 1 is composed of members such as a base, a shaft, a shaft holding base, a ring, and an oil-impregnated bearing, and further includes an insulating frame, a silicon steel plate, a circuit board, a magnet, and a motor case. The blades are combined to form a cooling fan structure. The upper end of the shaft has a conical shape, and an annular groove is provided at an appropriate position behind the upper end of the shaft. Is provided with an arc-shaped groove, the shaft holder is installed in the base, the shaft is penetrated in the oil-impregnated bearing, the ring is fitted into the annular groove, and the movement in the axial direction is restricted, The upper end of the shaft is supported by the shaft holding table, whereby the upper end of the shaft is in contact with the arcuate groove portion of the holding table in a minute area.

  The invention according to claim 2 is the structure of the fan shaft stand according to claim 1, wherein the bearing is an oil-impregnated bearing made of oil-impregnated plastic or ceramics, or a ball bearing.

The structure of the fan shaft base according to the present invention is configured by combining a shaft holding base with a shaft having a cone-shaped end. With the above-described structure, the shaft is in contact with the shaft holding base at the point of the upper end of the spindle. The friction area between them becomes small, the frictional force is relatively small, rotation can be performed more smoothly, noise is small, and heat is hardly generated.

Embodiments showing the objects, features, and effects of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the structure of the fan shaft base of the present invention includes members such as a base 11, a shaft 2, a shaft holding base 31, a ring 233, and an oil-impregnated bearing 321, and further includes an insulating frame 41 and a silicon steel plate 42. The circuit board 5, the magnet 61, the motor case 6, and the blades 7 are combined to form a cooling fan structure.

The shaft upper end 21 at one end of the shaft 2 has a conical structure, and an annular groove 22 is provided at an appropriate position behind the shaft upper end 21.

An arc-shaped concave groove 311 is provided at the central portion of the shaft holding table 31, and the shaft holding table 31 is installed in the base 11.

The shaft 2 extends through the oil-impregnated bearing 321, the ring 233 is fitted into the annular groove 22, and movement in the axial direction is restricted, and the shaft upper end 21 is supported by the shaft holding base 31. With the above-described structure, the shaft upper end 21 is in contact with a portion of the arc-shaped groove 311 of the shaft holding base 31 with a small area, so that the frictional resistance is extremely small, and the blade 7 can be easily started to rotate. Less likely to generate heat. Further, most of the shaft 2 is supported by the shaft holding base 31, and the oil-impregnated bearing 321 receives only a part of the supporting force, so that it is not easily worn, has little noise, and has a long product life.

The oil-impregnated bearing 321 installed in the base 11 can also use a ball bearing 322 as shown in FIG. 2, and can limit the movement of the ball bearing 322 in the axial direction by installing the copper stopper ring 24, As in the embodiment of FIG. 1, the shaft holding base 31 receives most of the load and supporting force, and the provided bearings 322 extend the service life.

As can be seen from the above description, the structure of the fan shaft base of the present invention can surely achieve the reinforcing effect, effectively solve the drawbacks in the structure of the fan shaft base according to the prior art, and have extremely high practical value. Inventions that are the same as or similar to the present invention are not published in publications in Japan and overseas, and are not disclosed or used.

The inventor of the present invention has already tested the above-described invention and proved that the use of this structure is simple and practical.

The above detailed description shows an embodiment of the present invention, and does not limit the actual scope of the present invention. All changes in structural features and functions are included in the claims of the present invention. It is.

1 is a cross-sectional view illustrating a structure of a fan shaft base according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the fan shaft stand by 2nd Example of this invention. It is sectional drawing which shows a prior art.

Explanation of symbols

11 base 2 shaft 21 shaft upper end 22 annular groove 231 lower oil ring 232 upper oil ring 233 ring 24 copper stopper ring 31 shaft holding base 311 arc-shaped concave groove 321 oil-impregnated bearing 322 ball bearing 41 insulating frame 42 silicon steel plate 5 circuit board 6 Motor case 61 Magnet 7 Blade

Claims (2)

An insulating frame fixedly supported on a base, a silicon steel plate, a circuit board, a shaft rotatably supported on a shaft holding base installed on the base with respect to the oil-impregnated bearing, and a motor fixed to the shaft A cooling fan is composed of a case, blades and magnets,
An arc-shaped concave groove is provided in the central part of the shaft holding base, and the upper end of one end of the shaft is formed in a conical shape, and an annular groove is provided at the rear thereof to fit a ring so that the shaft is oil-impregnated. A cooling fan, characterized in that it passes through a bearing and is contact-supported on an arc-shaped concave groove of a shaft holding base by the weight-shaped end, and movement in the axial direction is restricted by the ring.   2. The structure of a fan shaft stand according to claim 1, wherein the oil-impregnated bearing is an oil-impregnated bearing made of an oil-impregnated plastic or ceramics, or a ball bearing.

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