CN104482049B - Dynamic-pressure gas bearing - Google Patents
Dynamic-pressure gas bearing Download PDFInfo
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- CN104482049B CN104482049B CN201410773398.2A CN201410773398A CN104482049B CN 104482049 B CN104482049 B CN 104482049B CN 201410773398 A CN201410773398 A CN 201410773398A CN 104482049 B CN104482049 B CN 104482049B
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Abstract
The invention discloses a dynamic-pressure gas bearing. The dynamic-pressure gas bearing comprises a stator part and a rotor part, wherein the stator part comprises two bullet-shaped stators which are connected at the tail portions through a shaft sleeve into a whole; the rotor part comprises two cap-shaped rotors matched with the stators in shape, the rotors are connected in the mode that brims of the rotors are opposite to each other, and a rotor hood is formed; a sealing gasket is arranged between the two brim parts, and an opening is formed in the outer end of each brim part; the rotor part covers the stator part in a freely rotatable manner, and the two outer ends of the rotor hood are respectively sealed with the two outer ends of the stator part through grate teeth, so that a closed space is formed between the stator part and the rotor hood; an annular gas cavity is formed between the rotor part and the shaft sleeve and filled with lubricating gas, dynamic pressure generating grooves are formed in the outer peripheral faces of the stators or the inner peripheral faces, opposite to the stators, of the rotors. According to the dynamic-pressure gas bearing disclosed by the invention, because the interior gas cavity is used, the gas is supplied in the interior, external packaging is not required, and the dimensions can be reduced by 50% relative to the traditional layout.
Description
Technical field
The present invention relates to kinetic pressure air-float bearing of inner, more particularly to a kind of radial and axial compound kinetic pressure air-float bearing of inner, category
In gas bearing technical field.
Background technology
Gas bearing is a kind of sliding bearing using gas as lubricant.Since the sixties in 20th century, with
Nuclear technology, space technology, microelectric technique, information technology and biological engineering etc. it is emerging science and technology and grow up, processing,
Accuracy of detection has developed to nanometer level at present from millimeter, micron to submicron, and towards atomic lattice size (sub- nanometer) water
Flat to stride forward, all these progress have relied on the continuous lifting of Ultra-precision Turning and ultraprecise detection technique level, at this stage
The development of science and technology is put forward higher requirement to Ultra-precision Turning and ultraprecise detection technique, such as high accuracy, big load, height
Rigidity, low discharge, high-resolution, high stability, low vibration, creep, low cost etc..Gas bearing is with its big advantage
It is widely used in Ultra-precision Turning and ultraprecise detection field.Nineteen thirty-nine, the U.S. is to the gas lubrication on gyroscope
Bearing has carried out test for the first time.Kinetic pressure gas lubrication bearing is applied to inertia to improve guided missile accuracy by nineteen thirty-nine, Germany
Navigation field substitutes mechanical bearing.Nineteen fifty-nine, U.S.'s successful Application kinetic pressure gas profits on its its first man made earth satellite
Plain besring.Also it is widely used in civil area, gas lubrication technology, such as high-speed air turbine, high-speed dental drill, precision
Grinding machine spindle, fine boring machine guide rail, ergometer, balance, high-speed motion picture camera etc..
Kinetic pressure air-float bearing of inner is also called self-applying bearing.The prerequisite of kinetic pressure air-float bearing of inner is the presence of height between work surface
The relative motion of speed, while and there is wedge gap or step (FilippoGammarelli bearing), as stickiness is acted on, gas is brought between lubrication
Gap, produces gas film pressure, forms dynamic pressure air film.This bearing is without the need for air feed equipment, simple system.Its major defect is to carry energy
Power is low, rigidity is little, there is dry friction phenomenon with stopped process starting, and has contact wear, and restricted lifetime need to be using high wear-resistant
Material simultaneously carries out necessary surface treatment to improve the life-span.Conventional air-bearing structure, such as Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) and
Shown in Fig. 1 (d).
Kinetic pressure air-float bearing of inner structure mainly adopts both sides air inlet aerodynamic arrangement, Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) and figure at present
Kinetic pressure air-float bearing of inner structure given by 1 (d) adopts both sides air inlet, and by taking Fig. 1 (b) as an example, in figure, two hemisphere portions are divided into
Two stators, lateral shadow part are rotor, and the position indicated by arrow is Inlet Position.It is little to there is rigidity in above-mentioned design, has
Effect load is low, is difficult encapsulation, lubricates gas susceptible, the problems such as cause bearing air inlet blocking, load-carrying ability to decline.
The content of the invention
For above-mentioned technical problem, the invention provides one kind is supplied by built-in air cavity, lubrication gas is made not receive environment
Affect, with radial and axial compound high bearing capacity, and encapsulate simple kinetic pressure air-float bearing of inner.
The technical scheme is that：
A kind of kinetic pressure air-float bearing of inner, including：Stationary part, including two bullet type stators, and by an axle sleeve with bullet
The mode that the afterbody of type stator is connected is connected as an entirety, rotor portion, including two are matched shape with the stator
Hat rotor, and link together in the way of visor portion is relative to each other, form rotor cap, two brim parts point it
Between be provided with seal washer, with an opening, the rotor portion is with rotatable side for the outer end of each hat section
Formula is located on the stationary part, and two outer ends of rotor cap are respectively and two outer ends of stationary part between by combing
Tooth is obturaged, and is thus formed with confined space between the stationary part and rotor cap, the rotor portion and the axle sleeve it
Between be formed with annular air cavity, the air cavity full of lubrication gas, each stator outer peripheral face or the rotor it is fixed with each
Dynamic pressure is formed with the relative inner peripheral surface of son and produces groove.
Preferably, in described kinetic pressure air-float bearing of inner, the outer peripheral face of each stator is formed with some spiral helicine dynamic pressures
Produce groove；The hand of helix that the dynamic pressure of two stators produces groove is contrary.
Preferably, in described kinetic pressure air-float bearing of inner, it is 40 that the dynamic pressure on each stator produces the number of groove, arbitrary
It is 2 μm that dynamic pressure produces the groove depth of groove, and helical angle is 30 °, and a dynamic pressure produces the groove width and an adjacent slotless bandwidth of groove
Ratio be 0.2.
Preferably, in described kinetic pressure air-float bearing of inner, the length of the rotor is 26mm, the diameter of arbitrary visor portion
For 26mm, the maximum gauge of the cap body part of arbitrary hat section is 20mm.
The present invention technique effect be：
(1) present invention compares other air-bearings and has higher adaptive capacity to environment, using the air cavity of indoor design, moistens
Sliding gas does not receive external influence.The air inlet of traditional kinetic pressure air-float bearing of inner both sides is compared, is difficult to result in blockage, load-carrying ability is stable,
Little, the life-span length of abrasion., due to the internal air cavity of employing, air inlet internally, it is not necessary to be packaged in outside, size is relative for the present invention
50% can be reduced in traditional layout.Present configuration is compact, encapsulates and is fixed using gluing and pin, and structural strength is big.
(2) present invention adopts both sides " bullet type " stator, and the design of outside " medicated cap type " rotor, air-bearing have simultaneously
Higher radial direction, bearing load ability.
(3) groove is produced using spiral helicine dynamic pressure on stator, groove depth is 2 μm, and groove width ratio is 0.2, slot number 40, is compared same
The conventional hydrodynamic bearing layout increase radial load of external diameter increases by 50%, and axial load ability increases by 20%.
Description of the drawings
Fig. 1 (a) is a kind of structural representation of kinetic pressure air-float bearing of inner of the prior art；
Fig. 1 (b) is the structural representation of another kind of kinetic pressure air-float bearing of inner of the prior art；
Fig. 1 (c) is the structural representation of another kinetic pressure air-float bearing of inner of the prior art；
Fig. 1 (d) is the structural representation of another kinetic pressure air-float bearing of inner of the prior art；
Fig. 2 is the outside drawing of kinetic pressure air-float bearing of inner of the present invention；
Fig. 3 is the structural representation of the stator of kinetic pressure air-float bearing of inner of the present invention；
Fig. 4 is the structural representation of kinetic pressure air-float bearing of inner of the present invention；
Fig. 5 is the structural representation of rotor of the present invention；
Side views of the Fig. 6 for Fig. 5；
Fig. 7 is enlarged drawing at the local A of Fig. 4.
Specific embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Fig. 2 to Fig. 6 is referred to, the invention provides a kind of kinetic pressure air-float bearing of inner, including：At least one stator 2；Rotor 1,
The inside of the rotor 1 is hollow, and the rotor is rotatably set at least one stator 2, at each
Dynamic pressure is formed with the inner peripheral surface of a part relative with each stator for the outer peripheral face of stator 2 or the rotor and produces groove 6；Gas
Chamber 7, which is the space limited by another part of the rotor 1, and the air cavity is full of lubrication gas, in rotor rotation
When to the dynamic pressure produce groove 6 feed lubrication gas with the dynamic pressure produce groove in lubrication gas in produce dynamic pressure.
Traditional air-bearing structure is generally required and is packaged in rotor exterior, to extend the service life of its adverse circumstances
Time, cause size larger.The present invention by Bearing inner design air cavity, in the certain lubrication gas of air cavity storage inside,
Directly from air cavity air-breathing when bearing runs, it is to avoid from extraneous suction lubrication gas, do not affected by extraneous adverse circumstances.In addition,
The present invention need not be packaged in outside, and size can reduce by 50% relative to traditional structure.Fig. 5 and Fig. 6 is referred to, it is excellent
Selection of land, the length of the rotor is 26mm, a diameter of 26mm of arbitrary visor portion 9, the cap body part 8 of arbitrary hat section
Maximum gauge is 20mm.Present configuration is compact, encapsulates and is fixed using gluing and pin, and structural strength is big.
In one embodiment, at least one stator 2 includes two stators, and two stators are connected by an axle sleeve；
The air cavity is the space between another part of the rotor and the axle sleeve.
Preferably, the stator 2 is bullet shaped.
Preferably, the rotor 1 includes two hat sections, and the visor portion 9 of two hat sections connects toward each other
Together.Rotor cap overlays on the outside of two stators 2 (namely left stator and right stator in Fig. 3), and rotor and stator phase
To a part (the namely left-half and right half part in figure) should have the shape that matches with stator, so as to left side
Divide and bearing clearance can be formed and left stator between, while bearing clearance can be formed between right half part and right stator.Rotor
Left-half and right half part between part just correspond to axle sleeve, formed an annular air cavity 7.When rotor rotates, lubrication
Gas is flowed out from air cavity, and is flowed to both sides, is acted on (shown by arrow with producing dynamic pressure respectively in the dynamic pressure of both sides generation groove
The direction of position gas flowing).
In one embodiment, the outer peripheral face of each stator 2 is formed with some spiral helicine dynamic pressures and produces groove 6；Two fixed
The hand of helix that the dynamic pressure of son produces groove is contrary.
Air-bearing is often air, helium as a kind of sliding bearing using gas as lubricant, lubrication gas, nitrogen
Or noble gases.Due to the gap of air-bearing it is very little, typically in several microns between tens microns.Dynamic pressure air float
During bearing working, the lubrication gas flow in gap is generally very little, produces the parameters such as the conduit of groove through optimizing dynamic pressure, can be with
Further reduce the flow of lubrication gas, so as to contribute to reducing the volume of air cavity, reduce the size of bearing.Preferably, please join
Fig. 4 and Fig. 7 is read, it is 40 that the dynamic pressure on each stator produces the number of groove, it is 2 μm that arbitrary dynamic pressure produces the groove depth of groove, spiral
Angle B is 30 °, and groove width ratio is that 0.2 (i.e. one dynamic pressure produces the groove width of groove 6
0.2)。
In addition, air-bearing is carried, usual ability is low, and rigidity is little, traditional air-bearing be typically all only consider radially or
Person is axial carrying capacity.The present invention proposes " bullet shaped " stator, and dynamic pressure produces groove and adopts equiangular helical spiral, and combines above-mentioned excellent
The groove parameter of change, compares traditional air-bearing, and radial load increases by 50%, and axial load increases by 20%.
In one embodiment, seal washer 4 is provided between two visor portions 9, by four bolts 10 by two
Visor portion 9 is linked.In addition, the outer end 11 of each hat section is with an opening, the hat section outer end 11 and one
By labyrinth gas sealses between the outer end of stator, so as to its air-tightness is kept in bearing working, it is ensured that stable load.
The present invention improves the radial and axial load energy of load of bearing on the basis of kinetic pressure air-float bearing of inner complexity is not increased
Power, reduces the abrasion of bearing, increases the life time of bearing.
Although the present invention is disclosed as above with preferred embodiment, which is not for limiting the present invention, any this area skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification, therefore, the guarantor of the present invention
The scope that shield scope should be defined by the claims in the present invention is defined.
Claims (4)
1. a kind of kinetic pressure air-float bearing of inner, it is characterised in that include：
Stationary part, including two bullet type stators, and connect by way of an axle sleeve is connected with the afterbody of bullet type stator
An entirety is connected in,
Rotor portion, including two matched the hat rotor of shape with the stator, and with visor portion side relative to each other
Formula links together, and forms rotor cap, is provided with seal washer, the outer end of each hat section between two visor portions
Portion is located on the stationary part in rotatable mode with an opening, the rotor portion, two of rotor cap
Outer end respectively and two outer ends of stationary part between by labyrinth gas sealses, thus the stationary part and rotor cap it
Between be formed with confined space, be formed with annular air cavity between the rotor portion and the axle sleeve, the air cavity is full of lubrication gas
Body,
Dynamic pressure is formed with the inner peripheral surface relative with each stator of the outer peripheral face or the rotor of each stator and produces groove.
2. kinetic pressure air-float bearing of inner as claimed in claim 1, it is characterised in that the outer peripheral face of each stator is formed with some spirals
The dynamic pressure of shape produces groove；The hand of helix that the dynamic pressure of two stators produces groove is contrary.
3. kinetic pressure air-float bearing of inner as claimed in claim 2, it is characterised in that the dynamic pressure on each stator produces the number of groove and is
40, it is 2 μm that arbitrary dynamic pressure produces the groove depth of groove, and helical angle is 30 °, and a dynamic pressure produces the groove width and an adjacent nothing of groove
The ratio of groove bandwidth is 0.2.
4. kinetic pressure air-float bearing of inner as claimed in claim 1, it is characterised in that the length of the rotor is 26mm, arbitrary the brim of a hat
Partial a diameter of 26mm, the maximum gauge of the cap body part of arbitrary hat section is 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410773398.2A CN104482049B (en) | 2014-12-12 | 2014-12-12 | Dynamic-pressure gas bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410773398.2A CN104482049B (en) | 2014-12-12 | 2014-12-12 | Dynamic-pressure gas bearing |
Publications (2)
| Publication Number | Publication Date |
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| CN104482049A CN104482049A (en) | 2015-04-01 |
| CN104482049B true CN104482049B (en) | 2017-05-03 |
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| CN201410773398.2A Active CN104482049B (en) | 2014-12-12 | 2014-12-12 | Dynamic-pressure gas bearing |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438702A (en) * | 2016-11-22 | 2017-02-22 | 江苏工大金凯高端装备制造有限公司 | Aerostatic air-floating bearing |
| CN107332414A (en) * | 2017-08-14 | 2017-11-07 | 江苏环球特种电机有限公司 | A kind of meterial saving and high efficiency threephase asynchronous |
| EP3495677A1 (en) * | 2017-12-05 | 2019-06-12 | Fischer Engineering Solutions AG | Gas bearing cartridge and use of same |
| CN110195744B (en) * | 2019-05-27 | 2024-05-03 | 中国航天空气动力技术研究院 | Air bearing structure with rapid heat dissipation function |
| CN113982985B (en) * | 2021-11-17 | 2024-05-17 | 东南大学 | Micro-air passage bearing of air compressor for vehicle-mounted fuel cell |
| CN114294330B (en) * | 2021-12-30 | 2022-09-23 | 哈尔滨工业大学 | High-precision rotating ring-shaped part inner supporting air-floating type static balancing device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010006425A (en) * | 1997-04-17 | 2001-01-26 | 더 팀켄 컴퍼니 | rotary air bearing and process for manufacturing the same |
| CN1097178C (en) * | 1998-07-17 | 2002-12-25 | 皇家菲利浦电子有限公司 | Dynamic groove bearing comprising porous lubricant reservoir |
| JP3687570B2 (en) * | 2001-06-13 | 2005-08-24 | 松下電器産業株式会社 | DYNAMIC PRESSURE BEARING DEVICE, MOTOR AND DISK RECORDING DEVICE USING THE SAME |
| JP2006161967A (en) * | 2004-12-08 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Fluid bearing device and spindle motor |
| CN103595205A (en) * | 2013-10-28 | 2014-02-19 | 中国船舶重工集团公司第七0七研究所 | Dual-motor dragging integral hemisphere bearing gyro machine |
| CN103968982B (en) * | 2014-05-09 | 2016-01-06 | 中国航天空气动力技术研究院 | Based on the low resistance rolling moment measurement mechanism of air-bearing |
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2014
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