CN2641369Y - Integral structure of gascous dynamic pressure bearing - Google Patents

Abstract

The utility model relates to an aero dynamic bearing, in particular to a bearing group that integrates bearing and bearing sleeve. The utility model is characterized in that: a herringbone groove with the depth of above 12 um is arranged on the inner wall of the central hole that is arranged on the bearing group, the central hole is applied to assemble the rotary shaft of light load element. When the rotary shaft rotates at high speed, the air around the rotary shaft is driven to rotate to form an air whirlpool between the rotary shaft and the inner wall of the bearing. The air whirlpool forms an air pressure membrane between the rotary shaft and the inner wall of the central hole. The air pressure membrane makes the rotary shaft suspend and stably rotate in the center of the air whirlpool instead of bumping into the inner wall of the bearing. The outer diameter of the bearing body is provided with an integrated concave ring part to provide the bearing to be arranged on other objects. The bodies at both ends of the central hole are provided with an inner concave space to make the air flow smoothly into the herringbone groove to produce convection.

Description

The aero dynamic bearing integrative-structure

Technical field

The utility model relates to a kind of bearing that is used to support the radiating fan for computer rotating shaft.

Background technique

Generally be used for the bearing of combined computer radiation fan rotating shaft, mainly include sliding bearing and ball bearing.Fig. 4 shows the structure of known sliding bearing, includes inner bearing A and external axle sleeve B, is binded fixing between inner bearing A and the external axle sleeve B with viscose; After the internal face of inner bearing A injects lubricant oil, rotating shaft S is combined in the inner bearing A, thereby between the internal face of rotating shaft S and inner bearing A, forms oil film.When rotating shaft S rotates, reach spin stabilization and reduce the purpose that shakes with noise as the media that hangs down surface friction drag by the oil film between rotating shaft S and the inner bearing A.

Yet sliding bearing belongs to the structure that is slidingly matched after all, still can produce high temperature when running speed is too fast, and permanent use makes deterioration of lubricant easily, even produces impurity, causes bearing operation to have some setbacks or stuck, causes the problem that parts damage of using.

Second shortcoming is because use lubricant oil, prevents that lubricant oil from spilling so must design oil sealing, and dust cover is set avoids dust impurity to enter causing component wear in the bearing, thereby increase production and assembly cost.

The 3rd shortcoming is that oil sealing and dust cover often have the effect of sealing lubricating oil and dust protection really, and causes the phenomenon of leakage of oil and bearing wear.

Fig. 5 shows when using general ball bearing C that ball bearing C must be arranged on axle sleeve D inside, rotating shaft S then is located at ball bearing C; As counterrotating media between rotating shaft and the axle sleeve, produce less frictional force to be different from sliding bearing by ball bearing C by the rolling of ball.In addition, ball bearing still needs to use lubricant oil; Even some also must use dust cover, thereby the shortcoming that still exists sliding bearing and had.

Summary of the invention

First problem to be solved in the utility model, be that known slip or ball bearing must comprise inner bearing and external axle sleeve, cause structure comparatively complicated, and because must bind with viscose between inner bearing and the external axle sleeve, also generation assembling, manufacturing comparatively are difficult for, adhesive strength is not enough, cause bearing to get loose easily, the manufacture cost problem of higher.

Second problem to be solved in the utility model is known slip or ball bearing makes deterioration of lubricant easily under permanent the use, even produces impurity, causes bearing operation to have some setbacks or stuck, causes the problem that parts damage of using.

The 3rd problem to be solved in the utility model is that the bearing of known use lubricant oil must design assemblies such as oil sealing and dust cover and prevents that lubricant oil from spilling, and the contamination by dust bearing parts, will increase the problem of producing with assembly cost.

The 4th problem to be solved in the utility model is the bearing of known use lubricant oil, and its oil sealing and dust cover may produce the shortcoming of poor sealing.

The technological means of aero dynamic bearing provided by the utility model is to produce a bearing pack in one-body molded mode, must comprise inner bearing and external axle sleeve in order to solve known bearing, causes the comparatively complicated shortcoming of structure.Technological means of the present utility model, be internal face at the set center hole two ends of bearing body to process the degree of depth be 12 microns man type grooves more than (μ m), described center hole is in order to the rotating shaft of combination light load element (for example radiating fan for computer); When the rotating shaft high speed rotating, being driven rotating shaft surrounding atmosphere rotates, between rotating shaft and bearing inner wall, cause an air whirl, between rotating shaft and center bore inner wall, form a uniform and stable and powerful air pressure film by this air whirl, this air pressure film makes rotating shaft be suspended in the central authorities and the stable rotation of air whirl, not can with the bearing inner wall collision friction; The external diameter of described bearing body is integrally formed with concave ring part, provides bearing to be arranged on his thing, and the body at these center hole two ends is provided with interior concave space, makes air be able to produce convection current at described man type groove swimmingly.

The utility model aero dynamic bearing and known bearing relatively have the following advantages:

1. aero dynamic bearing of the present utility model is to be made by one-body molded mode, not needing must be with inner bearing and external axle sleeve combination as traditional bearing, thereby structure is more simplified, it is more easy to make, cost also is minimized, the problem that can avoid the inside and outside axle sleeve of traditional bearing to come off simultaneously.

2. the utility model aero dynamic bearing is not because use lubricant oil, so unlubricated deterioration of oil even generates impurity, causes bearing operation to have some setbacks or stuck, causes the problem of using the parts damage.

3. this aero dynamic bearing, can be saved and produce and assembly cost so must not design elements such as oil sealing and dust cover because do not use lubricant oil.

4. this aero dynamic bearing is not because use lubricant oil, so no common oil leakage phenomenon.

5. the air pressure film that forms between rotating shaft and bearing inner wall of the air whirl of this aero dynamic bearing will make the very low friction of maintenance between rotating shaft and the bearing, and has quiet effect.

6. the air pressure film that forms between rotating shaft and bearing inner wall of the air whirl of this aero dynamic bearing will make rotating shaft be suspended in these air whirl central authorities and stable rotation, can not collide with bearing inner wall, improve the rotating shaft rotating speed simultaneously so can reduce vibrations.

7. this aero dynamic bearing adopts one-body molded mode to make, thereby overall structure is comparatively firm, and easy to manufacture, can reduce manufacture cost.

Description of drawings

Fig. 1 is the three-dimensional cutaway view of the utility model aero dynamic bearing structure;

Fig. 2 be the utility model aero dynamic bearing structure and and the section plan of rotating shaft combination;

Fig. 3 is the partial enlarged drawing of the man type groove on the center bore inner wall of the utility model aero dynamic bearing.

Fig. 4 is the section plan of known sliding bearing structure.

Fig. 5 is the section plan that known ball bearing cooperates axle sleeve and turning shaft structure.Among the figure

1 bearing body, 11 center holes

Concave space in the 12 man type grooves 13

2 rotating shafts of 14 concave ring parts

A inner bearing B external axle sleeve

C ball bearing D axle sleeve

The S rotating shaft

Embodiment

Existing conjunction with figs. is described further.Wherein Fig. 1 and Fig. 2 are used for showing the structural upright sectional view and the section plan of the utility model aero dynamic bearing respectively.

Can see from Fig. 1 and Fig. 2, aero dynamic bearing of the present utility model is a kind of integrated structure, its structure characteristic is to be provided with one at bearing body 1 to be used for making up the center hole 11 of rotating shaft, and the two ends of center hole 11 then are provided with the not interior concave space 13 of even depth respectively.It is 12 microns (μ m) above man type groove 12 that the internal face regional area of center hole 11 opposite ends then is provided with the degree of depth.The external diameter of bearing body 1 one ends is provided with concave ring part 14.Described aero dynamic bearing is to make in integrated mode, thereby does not need must cooperate axle sleeve to assemble as traditional sliding bearing or ball bearing.

The application mode of aero dynamic bearing of the present utility model is to utilize described concave ring part 14 fits to be fixed in his thing (for example being attached to fixed element on the host board etc.) as shown in Figure 2; Rotating shaft 2 then directly penetrates this center hole 11.When rotating shaft 2 high speed rotating, can drive rotating shaft 2 ambient airs and rotate, and then the guiding of the air in the concave space in the two ends 13 be entered in the center hole 11 and air is flowed in each man type groove 12; When the man type groove 12 of center hole 11 inwalls of the air impact bearing body 1 that rotates, air will cause an air whirl between rotating shaft 2 and center hole 11 inwalls, this air whirl forms a uniform and stable and powerful air pressure film then between rotating shaft 2 and center hole 11 inwalls, this air pressure film will make rotating shaft 2 be suspended in the central authorities and the stable rotation of this air whirl, and not can with center hole 11 collision frictions of bearing body 1.

Described man type groove 12 is located at the center hole of aero dynamic bearing 1, and about in the of 11 each about 1/3 place, two ends, and man type groove 12 is to be provided with in the mode that is symmetrical in the inwall circumference.So can between rotating shaft 2 and center hole 11 inwalls, form the air pressure film of required effect, so man type groove 12 is not then established in the zone, stage casing of this center hole 11, to save the cost of manufacturing.

Fig. 3 is the partial enlarged drawing that shows the man type groove 12 on center hole 11 internal faces of the utility model aero dynamic bearing 1, and the degree of depth of this man type groove 12 reaches more than 12 microns (μ m), and width then is about 100 microns (μ m).If the degree of depth of this man type groove 12 does not reach 8 microns (μ m), the air whirl that causes between rotating shaft 2 and the center bore inner wall is with strength deficiency, so the air pressure film that forms between rotating shaft 2 and inwall 11 is also with strength deficiency and inhomogeneous stable, so can not make rotating shaft 2 be suspended in the central authorities and the stable rotation of this air whirl, and the friction that will bump with the center hole 11 of aero dynamic bearing 1 loses the function that replaces lubricating oil oil film between general rotating shaft and the bearing.So this degree of depth reaches 12 microns (μ m) above man type groove 12, is the particular design of the utility model aero dynamic bearing 1.

The center hole 11 of bearing body 1 is passed in described rotating shaft 2; The two ends of rotating shaft 2 are respectively an output terminal and an input end.This input end connects motor, orders about rotating shaft 2 and rotates, and output terminal then can make fan rotate in conjunction with a fan.

The above is preferred embodiment of the present utility model only, is not in order to the utility model being done any pro forma restriction, and all relevant impartial modifications of being done according to the utility model claim or change are all the utility model claim and contain.

Claims (1)

1. an aero dynamic bearing integrative-structure is characterized in that being provided with center hole in one-body molded mode at bearing body, and at the internal face two ends of this center hole the man type groove is set.

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