CN200975361Y - Improved fan bearing structure - Google Patents

Abstract

The utility model relates to a modified fan bearing structure, utilize the bearing that rotates the fan and the rotation axis of configuration in this bearing, wherein the first air chamber and the second air chamber of different sectional areas are formed to the contact internal periphery of this bearing and rotation axis, and put into the emollient that oil film tension is greater than the internal static pressure of second air chamber in this first air chamber, so that this rotation axis is with first when installing in the bearing, two air chamber internal static pressures and emollient oil film tension form the location, and this rotation axis is under the atress rotation state, make emollient push formation oil film to the second air chamber through the bernoulli's theorem with the pressure differential of first air chamber and second air chamber and make the rotation axis entity support the rotation with the oil film and do not contact the purpose that the bearing reaches low friction loss.

Description

Improved fan bearing structure

technical field

The utility model relates to an improved fan bearing structure, in particular to a bearing structure used for bearing and lubricating the rotating shaft of a fan.

Background technique

The bearing is used to support the weight of the shaft and guide the movement of the shaft. The part of the shaft supported by the bearing is called the journal. The friction between the journal and the bearing will cause a lot of power loss and damage the bearing. Therefore, when discussing the bearing, it is necessary to consider the method of reducing friction, and all the stress generated by the shaft center is borne by the bearing, so it is necessary to have enough strength and adequate lubrication.

There are many types of bearings, and the common ones are mainly divided into ball bearings, fluid dynamic bearings and ceramic bearings. The most common one is ball bearings, which use 8 to 12 steel balls to support the weight of the motor, that is to say, when it rotates, it will produce The friction of the metal surface, the steel ball will produce wear (run out) when it rotates. This characteristic creates a bottleneck in the use of ball bearings as the motor speed increases.

The biggest difference between the fluid dynamic bearing and the ball bearing is that the fluid dynamic bearing uses an oil film instead of the traditional steel ball. As shown in the first figure, a layer of oil film is attached to the inner edge of the traditional bearing 11 in the sleeve 3, so that the rotating shaft 1 can rotate smoothly. The fan blade 4 at the other end does work, and the ideal fluid dynamic bearing uses an oil film to support the rotating shaft 1 without direct contact with the bearing. That is to say, the ideal fluid dynamic bearing does not have metal contact when rotating, and theoretically there will be no The problem of wear and tear, so the fluid dynamic bearing has the advantages of absorbing vibration and lower wear than the ball bearing, but in order to achieve the ideal "wear-free" state of the fluid dynamic bearing, it is still necessary to continuously improve the storage and lubrication mechanism of the lubricant; the previous fluid dynamic bearing Utility model such as China Taiwan Announcement No. 505208 "Oil-impregnated Bearing Structure Improvement", its technical means is to improve that the bearing has a hollow chamber, and this chamber is placed a piece of oil-absorbing cotton to soak up the lubricating oil to provide the bearing of the rotating shaft. Lubrication, the center of this utility model has good lubrication, but the lubrication effect of the contact surface between the two ends of the bearing and the rotating shaft is significantly reduced; similar utility models are like the "oil storage bearing structure" of China Taiwan Announcement No. 350495, which is in the bearing, An oil storage space is formed between the sleeve and the latch of the sleeve to accommodate more lubricating oil and replenish it frequently. Although the amount of oil is sufficient, there is no mechanism to ensure the even distribution of lubricating oil, which may cause uneven wear For a long time, it will cause the contact surface between the bearing and the shaft to wear, which will not only reduce the running efficiency and make noise, but also cause the bearing to wear too much and lose its function over time, so the life is shortened a lot and the manufacturing cost is also reduced. Therefore, how to ensure that the bearing has sufficient and balanced lubrication has become the most important issue in bearing design.

Utility model content

Therefore, the most important purpose of the utility model is to distribute the lubricant to the bearing in a balanced manner, reduce wear with the rotating shaft, and minimize noise and vibration.

The improved fan bearing structure of the utility model is that at least two first air chambers are cut on the inner periphery of the bearing, and the second air chamber is formed from the end of the first air chamber to the lower edge of the bearing and the rotating shaft. The cross-sectional area of the chamber is larger than the cross-sectional area of the second air chamber, using the physical law described by Bernoulli's equation: the sum of pressure, kinetic energy and potential energy is a fixed value, so that the difference in air flow velocity when the bearing rotates causes a pressure difference, Push the lubricant stored in the first air chamber to the second air chamber; and the first air chamber communicates with an outer air chamber through a groove, so that the bearing can also be lubricated by atmospheric pressure when rotating at low speed The agent is pushed into the second air chamber.

Description of drawings

Fig. 1 is an exploded schematic diagram of a conventional embodiment.

Fig. 2 is an exploded schematic view of an embodiment of the present invention.

Fig. 3 is a cross-sectional view of an embodiment of the present invention.

Fig. 4 is a top view of the bearing of the embodiment of the utility model.

Fig. 5 is a bottom view of the bearing of the embodiment of the utility model.

Fig. 6 is an exploded schematic view of another embodiment of the present invention.

Fig. 7 is a sectional view of another embodiment of the present invention.

Detailed ways

Please refer to Fig. 2 to Fig. 5, the utility model is an improved fan bearing structure, which is used to help the rotating shaft 1 reduce friction when rotating, so that the rotating shaft 1 can work more efficiently. The utility model includes a bearing 2 and A rotating shaft 1 arranged in the bearing 2, one end of the rotating shaft 1 is connected with a fan blade 4, and the other end is combined with the bearing 2, wherein the contact inner periphery of the bearing 2 and the rotating shaft 1 forms at least two The first air chamber 21 and the second air chamber 22 with different cross-sectional areas, wherein the first air chamber 21 is formed by a first split groove 210 extending inward from the end surface of the inner peripheral edge but not connected to the other end surface, the first air chamber The chamber 21 is composed of multiple sets of first sectional grooves 210 that evenly divide the angle of the inner periphery, and the second air chamber 22 is formed by the reserved installation margin gap between the rotating shaft 1 and the bearing 2. The bearing 2 is installed in a sleeve 3, and the sleeve 3 is used to close the first air chamber 21 with a large cross-sectional area, and at least the oil film tension in the first air chamber 21 is greater than the static pressure in the second air chamber 22 Lubricant 5, so that when the rotating shaft 1 is mounted on the bearing 2, the position is formed by the internal static pressure of the first air chamber 21 and the second air chamber 22 and the oil film tension of the lubricant 5, and the rotating shaft 1 and the second Air-tight state is formed between the air chambers 22 and between the bearing 2 and the sleeve 3, so that the lubricant 5 cannot flow outward due to atmospheric pressure, forming a natural oil seal to avoid the loss of the lubricant 5.

According to the utility model, the Bernoulli equation is mainly used: the sum of pressure, kinetic energy and potential energy is a fixed value, and the kinetic energy is proportional to the square of the flow velocity. When the flow velocity flowing through the air chamber is smaller, the pressure generated The larger the pressure difference principle, therefore, through the first and second air chambers 21 and 22 with different cross-sectional areas formed between the bearing 2 and the rotating shaft 1 of the present utility model, the rotating shaft 1 can be rotated under force. , because the cross-sectional area of the first air chamber 21 is greater than that of the second air chamber 22, the flow velocity flowing through the first air chamber 21 is slower, causing the pressure of the first air chamber 21 to be greater than that of the second air chamber 22, so that the first air chamber The pressure difference between 21 and the second air chamber 22 forces the lubricant 5 to push against the second air chamber 22 from the tangential plane to form a cusp of the oil film, so that the rotating shaft 1 rotates with the oil film support of great tension but does not contact the bearing 2, Moreover, the rotating shaft 1 extends to touch the bottom of the sleeve 3, and a wear-resistant sheet 31 made of a wear-resistant material is provided at the bottom of the sleeve 3. When the rotating shaft 1 rotates, only the end of the rotating shaft 1 is marked with The contact type is in direct contact with the wear-resistant sheet 31, thereby achieving the purpose of low friction loss.

In addition, the utility model also takes into account that the rotating shaft 1 is in the low-speed operation state and in the initial positioning state, and the oil film may not be completely generated due to the fact that the physical flow rate has not been fully increased. Such a situation may cause the rotating shaft 1 to be activated first. It will contact with the bearing 2 and cause wear and tear. Therefore, the utility model forms a third air chamber 24 in the gap between the outer periphery of the bearing 2 and the sleeve 3, or sets multiple sets of second air chambers on the outer periphery of the bearing 2. The split grooves 240 are used to reinforce the pressure difference between the third air chamber 24 and the first air chamber 21, and the multiple sets of second split grooves 240 also equally divide the outer peripheral angle of the bearing 2, the third air chamber 24 and the first air chamber One air chamber 21 is connected by means of a plurality of grooves 23, and communicates to the outside through the third air chamber 24, so that the oil film generation of the initial operation of the rotating shaft 1 can be reinforced by means of the external atmospheric pressure difference, and it can effectively assist in stabilizing the shaft. positioning effect.

The utility model does not limit the second split groove 240 used to reinforce the pressure difference between the third air chamber 24 and the first air chamber 21 must be located on the outer peripheral edge of the bearing 2, as long as the external air and the first air chamber 21 can be achieved. The purpose of communication can also be set on the fan blade 4 or the sleeve 3; please refer to Figure 6 and Figure 7, another embodiment will reinforce the pressure difference between the third air chamber 24 and the first air chamber 21. The three sectional grooves 32 are arranged on the inner peripheral edge of the sleeve 3, and the multiple groups of third sectional grooves 32 of the sleeve 3 can achieve the same effect of pushing the lubricant 5 under atmospheric pressure, so that the rotating shaft 1 and the bearing 2 have a good lubricating effect.

For highlighting the progress of the utility model, the advantages of the utility model are enumerated as follows:

1. Use the pressure difference to push the lubricant 5 to make the lubricant 5 evenly distributed.

2. The oil film of the lubricant 5 is evenly divided into the second air chamber 22, so that the rotating shaft 1 is hardly in contact with the bearing 2 and does not cause wear.

3. Due to the air-tight state formed between the rotating shaft 1 and the second air chamber 22 and between the bearing 2 and the sleeve 3, the lubricant 5 cannot flow outward due to atmospheric pressure, forming a natural oil seal to avoid the loss of the lubricant 5, And generate greater oil film pressure to protect bearing 2 during operation.

4. The structure is simpler than the previous utility model, which saves cost and is easy to produce quickly.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model. In the above embodiments, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. improved fan spindle bearing structure includes:

Bearing (2);

Be configured in the running shaft (1) in the described bearing (2);

It is characterized in that, described bearing (2) and running shaft (1) contact first air chamber (21) and second air chamber (22) that inner circumference edge forms at least two different cross-sectional, and on bearing (2), be provided with first air chamber (21) of sleeve (3) with the sealing larger sectional area, and in described first air chamber (21), insert the oiling agent (5) of oil film tension force at least greater than the static pressure in second air chamber (22), make when described running shaft (1) is installed in the bearing (2), with first, two air chambers (21,22) the oil film tension force of Nei static pressure and oiling agent (5) forms the location, and described running shaft (1) is under stressed rotary state, push to second air chamber (22) with the pressure official post oiling agent (5) of first air chamber (21) and second air chamber (22) and to form oil film and make running shaft (1) entity support rotation and contact bearing (2) not, reach the purpose of low friction loss with oil film.

2. improved fan spindle bearing structure according to claim 1 is characterized in that, described second air chamber (22) forms with the installing nargin gap of described running shaft (1) with the reservation of described bearing (2).

3. improved fan spindle bearing structure according to claim 1 is characterized in that, described first air chamber (21) by described bearing (2) inner circumference edge by end face inwardly with first profile groove (210) but be not communicated to the other end and form.

4. improved fan spindle bearing structure according to claim 3 is characterized in that, described first air chamber (21) constitutes with many groups first profile grooves (210) of dividing equally the inner circumference edge angle.

5. improved fan spindle bearing structure according to claim 1, the gap that it is characterized in that described bearing (2) outer periphery and described sleeve (3) forms the 3rd air chamber (24), and described bearing (2) is provided with groove (23), and to make described the 3rd air chamber (24) and described first air chamber (21) be connected state.

6. improved fan spindle bearing structure according to claim 5 is characterized in that, described bearing (2) outer periphery are provided with second profile groove (240) with the pressure difference of reinforcement the 3rd air chamber (24) with first air chamber (21).

7. improved fan spindle bearing structure according to claim 6 is characterized in that, described the 3rd air chamber (24) is made of many groups second profile grooves (240) of equal two-part bearing (2) outer periphery angle.

8. improved fan spindle bearing structure according to claim 5 is characterized in that, described sleeve (3) inner circumference edge is provided with the 3rd profile groove (32) with the pressure difference of reinforcement the 3rd air chamber (24) with first air chamber (21).

9. improved fan spindle bearing structure according to claim 8 is characterized in that, described the 3rd air chamber (24) is made of many groups the 3rd profile grooves (32) of dividing equally sleeve (3) inner circumference edge angle.

10. improved fan spindle bearing structure according to claim 1 is characterized in that, described running shaft (1) extends the described sleeve of contact (3) bottom, and is provided with the wear plate (31) that high-abrasive material is made in described sleeve (3) bottom.

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