CN103827527B - Air bearing unit - Google Patents
Air bearing unit Download PDFInfo
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- CN103827527B CN103827527B CN201280046551.0A CN201280046551A CN103827527B CN 103827527 B CN103827527 B CN 103827527B CN 201280046551 A CN201280046551 A CN 201280046551A CN 103827527 B CN103827527 B CN 103827527B
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- Prior art keywords
- air
- bearing gap
- thrust
- gap
- thrust bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Thering is provided a kind of structure for compact air bearing unit, this compact air bearing unit has simple structure, is not in contact with ground and more stably supports the parts with high-speed rotation.Fluid (t) is supplied to journal bearing gap (60) from porous around knot layer (102), to form fluid film in journal bearing gap (60), and the fluid (t) in gas form is discharged to thrust bearing gap (61a, 61b) from journal bearing gap (60), these thrust bearing gaps are connected to journal bearing gap (60).Fluid film utilizes discharge gas (t1) to be formed in thrust bearing gap (61a, 61b).The fluid (t) in gas form owing to discharging from journal bearing gap (60) is supplied to thrust bearing gap (61a, 61b), so there is no need to be additionally provided with air bearing unit groove and thrust bearing surface, its further groove discharges the fluid (t) in gas form from journal bearing gap (60), and fluid (t) is ejected into thrust bearing gap (61a, 61b) by thrust bearing surface.
Description
Technical field
The present invention relates to the structure of a kind of air bearing unit, this air bearing unit is with simple
High-speed rotating component (such as pulley) is more stably supported by structure with contactless state.
Background technology
Patent document 1 describe that a kind of air bearing unit (aerostatic bearing unit), this
Air bearing unit supports rotary shaft with being not in contact with.
This air bearing unit has porous restriction type and (uses the porous of such as porous graphite
Body) air bearing (aerostatic bearing), by cause respectively in the inside of cylindrical housings
Bearing surface (thrust bearing surface and journal bearing surface) in periphery receives axle (rotary shaft)
Thrust load and radial load, axle is inserted in this cylindrical housings.Here, journal bearing
Surface is relative with the outer peripheral edge surface of axle, thus journal bearing gap is formed at journal bearing table
Between face and outer peripheral edge surface.Thrust bearing surface is convex with formed in the outer peripheral edge of axle
Edge is relative, thus thrust bearing gap is formed between thrust bearing surface and flange.
In the inner peripheral surface of housing, discharge groove and stride across the journal bearing table of air bearing
It is (that is, relative with flange that face is formed at the side relative with thrust bearing surface in a circumferential direction
Side) on.In the outer peripheral edge surface of axle, another is discharged groove and is formed in a circumferential direction
Position at the thrust bearing surface of closer air bearing.
In this arrangement, the air thrust bearing table from air bearing of air bearing it is supplied to
Face and journal bearing surface are ejected.The air ejected from thrust bearing surface passes thrust axis
Hold gap and flow to the outer peripheral edge of flange, and be discharged to outside from thrust bearing gap.The opposing party
Face, the air ejected from journal bearing surface flows to closer thrust through journal bearing gap
The discharge groove discharged on groove and the side relative with thrust bearing surface of bearing surface, and
Flow to these discharge in groove.
Quote inventory
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Application Publication No.2008-57696
Summary of the invention
Technical problem
But, according to the air bearing unit described in patent documentation 1, it is necessary that
The position of closer thrust bearing surface and striding across journal bearing surface and thrust bearing surface phase
To side on position each at be pre-formed discharge groove, be used for discharging and be supplied to radially
The air of bearing clearance.This makes structure complicated.
Further, it is necessary that air bearing is separately provided with thrust bearing surface and radial direction
Compressed air is ejected on bearing surface, this thrust bearing surface and journal bearing surface.This thickeies
Air bearing, and correspondingly, the size of air bearing unit becomes bigger.
Incidentally, air bearing the high-speed rotating component of such as pulley is kept to supply
Self-excited vibration is caused during air.When this causes the resonance of system, it is such as institute's carrier
The stable traveling of body becomes obstacle.
The present invention is by being formed in view of situation above.It is an object of the invention to provide one
Planting the structure of compact air bearing, this compact air bearing passes through simple structure by high-speed rotation
Parts more stably support with contactless state.
Solution for problem
In order to solve problem above, according to the present invention, fluid is supplied to journal bearing from porous layer
Gap, with in journal bearing gap formed fluid film, and then fluid between journal bearing
Gap is discharged to thrust bearing gap.Discharge fluid and be used for also being formed in thrust bearing gap fluid
Film.
Such as, the present invention provides a kind of air bearing unit, and this air bearing unit is by footpath
Fluid film supports and turns with being not in contact with present in the bearing clearance and the first thrust bearing gap
Kinetoplast, this rotor in rotational direction rotates around axis, wherein:
Air bearing unit includes:
Metal base (back metal), has: first surface, this first surface around axis,
And between first surface and rotor, form journal bearing gap；And second surface, this is years old
Two surfaces are adjacent with first surface, and form the first thrust between second surface and rotor
Bearing clearance, and the first thrust bearing gap is connected to an end side in journal bearing gap；
With
Porous layer, this porous layer is formed on the first surface, and supplies fluid to radial axle
Hold gap, be used for being formed fluid film in journal bearing gap；And
Fluid flows to the first thrust bearing gap in journal bearing gap, and from journal bearing
Gap is discharged to the first thrust bearing gap, thus fluid film is formed at the first thrust bearing gap
In.
Beneficial effects of the present invention
According to the present invention, the compressed air discharged from journal bearing gap is supplied between thrust bearing
Gap, and hereafter discharge compressed air.Correspondingly, it need not be provided separately from for from radially
Bearing clearance is discharged compressed-air actuated groove and is used between blast injection to thrust bearing
The thrust bearing surface of gap.Therefore, it can simplify the structure of air bearing unit, this air axle
Bearing unit supports high-speed rotating component with being not in contact with.
Accompanying drawing explanation
Fig. 1 (A) and 1(B) be external view and side view, it is shown that according to the present invention one
A kind of air bearing unit 1 with pulley of individual embodiment；
Fig. 2 is exploded view, it is shown that according to an embodiment of the invention with the air of pulley
Bearing unit 1；
Fig. 3 (A) is front view, it is shown that pulley 20, and Fig. 3 (B) is Fig. 3 (A)
A-A cross section；
Fig. 4 (A), 4(B) and 4(C) be external view, cross section and upward view,
Show air axle 10, and Fig. 4 (D) is to amplify partial cross-section, it is shown that radial axle
Bearing portion divides 104；
Fig. 5 (A) is front view, it is shown that thrust plate 11, and Fig. 5 (B) is Fig. 5 (A)
B-B cross section；
Fig. 6 is view, schematically illustrates and props up during supplying air to air axle 10
The state of support pulley 20.
Detailed description of the invention
Now, embodiments of the invention be will be described with reference to the drawings.
First, a kind of air bearing unit 1 with pulley according to the present embodiment will be described
Structure.Here, enumerate wherein air bearing unit 1 with pulley and rotatably support pulley
The example of 20, this pulley 20 is used for transporting the wire of such as optical fiber.
Fig. 1 (A) and 1(B) be external view and side view, it is shown that according to the present embodiment
The air bearing unit with pulley.Fig. 2 is dividing of the air bearing unit 1 with pulley
Xie Tu.
As it can be seen, the air bearing unit 1 with pulley of the present embodiment includes: pulley 20,
As the object supported；Air axle 10, it is inserted into the air as described below of pulley 20
In shaft insertion hole 23, and in the case of being not in contact with, rotatably support pulley 20；Push away
Power plate 11, its anti-limited slip wheel 20 comes off from air axle 10；And nut 12, it is used for thrust
Plate 11 is fixed to air axle 10.By the journal bearing part 104 of air axle 10 is inserted into
In the air shaft insertion hole 23 of pulley 20 and then pass through by nut 12 via thrust plate 11
Faster pulley 20, and pulley 20 is assembled on air axle 10.
It follows that will be described in detail each element part of the air bearing unit 1 with pulley,
I.e. pulley 20, air axle 10 and thrust plate 11.
Fig. 3 (A) is front view, it is shown that pulley 20, and Fig. 3 (B) is Fig. 3 (A)
A-A cross section.
As it can be seen, pulley 20 has disc-shape, and the V-arrangement being used for receiving wire is recessed
Groove 26 is formed in the outer peripheral edge surface 29 of pulley 20 in a circumferential direction.Further, empty
Gas shaft insertion hole 23 position that central axis O1 passes through wherein is formed in pulley 20,
This air shaft insertion hole 23 passes pulley 20 to another surface from pulley surface 21
22.The journal bearing part 104 of air axle 10 as described below is slidably insert into air axle
Insert in hole 23.
In two surfaces 21,22 of pulley, form corresponding wheel hub 24,25, with around empty
Gas shaft insertion hole 23.The end face 241,251 of each wheel hub 24,25 is trimmed to flat.In group
In the air bearing unit 1 with pulley under dress state (state that figure 1 illustrates),
The end face 251 of one wheel hub 25 is relative with the ledge surface as described below 1034 of air axle 10,
And the end face 241 of another wheel hub 24 and a surface 111 as described below of thrust plate 11
Relatively.
Fig. 4 (A), 4(B) and 4(C) be external view, cross section and upward view,
Show air axle 10, and Fig. 4 (D) is amplifier section cross section, it is shown that radial axle
Bearing portion divides 104.
As it can be seen, air axle 10 includes: the metal base 101 of stepped cylindrical shape；Many
Hole sinter layer 102, described porous sintered layer 102 is formed at the mid portion of metal base 101
On the outer peripheral edge surface 1042 of (journal bearing part) 104.
Metal base 101 includes: base segments 103, has the wheel hub 24,25 with pulley 20
The almost identical diameter of external diameter；Journal bearing part 104, has than base segments 103
The diameter that diameter is little；And bar part 105, there is specific diameter to the diameter of bearing portions 104 very
To less diameter.
In an end face (lower surface) 1031 of base segments 103, form multiple screw
Hole 1032, is used for the air bearing unit 1 with pulley is fixed to such as stone surface plate
On pedestal.Further, in this base segments 103, formation: air flue 106,
It leads to journal bearing part 104 from lower surface 1031 through the inside of base segments 103
Inside；Supplying opening 107 with air, it is directed to air and leads to from outer peripheral edge surface 1033
Road 106.In the open interior of air supply opening 107, form threaded portion 1071, be used for
Couple the air supply pipe (not shown) of pump.The opening 1061 of air flue 106 is by stopple (not
Illustrate) close, thus the compression of air supply opening 107 it is supplied to from the air supply pipe of pump
Air flow journal bearing part 104.
Journal bearing part 104 is at another end face (upper end) 1034 of base segments 103
Above form with base segments 103.The permeable porous sintered layer 102 of air is formed at
In the Zone Full on the outer peripheral edge surface 1042 of journal bearing part 104.In radial bearing portion
Dividing in the outer peripheral edge surface 1042 of 104, two grooves 1043 are formed also in a circumferential direction
And be positioned on the dorsal part of porous sintered layer 102.Further, in the bottom of each groove 1043
In, form the hole 1044 being directed to air flue 106.Whereby, from being connected to air supply
When being initially supplied air of the air supply pipe of the pump of opening 107, the compressed air sent from pump
Being supplied to each groove 1043 through air flue 106 and hole 1044, this groove 1043 is formed
In a circumferential direction and be positioned on the dorsal part of porous sintered layer 102.Compressed air is passed through
Pore in porous sintered layer 102, and from the outside being radially directed towards of porous sintered layer 102
Peripheral edge surface 1021 ejects, 1021, the outer peripheral edge surface that this is radially directed towards journal bearing
The effect on surface.In the present embodiment, the groove of location on the dorsal part of porous sintered layer 102
The quantity of 1043 is two.Certainly, the groove 1043 on the dorsal part of porous sintered layer 102
Quantity can determine according to the width h of the most porous sintered layer 102.
External diameter R1 including the journal bearing part 104 of porous sintered layer 102 is designed to than cunning
The internal diameter r1(of the air shaft insertion hole 23 of wheel 20 is shown in Fig. 3 (A)) little specified value.Therefore,
When journal bearing part 104 is inserted in the air shaft insertion hole 23 of pulley 20, at sky
The inner peripheral surface 28 of gas shaft insertion hole 23 and the porous of the circumference of journal bearing part 104
The outer peripheral edge surface (that is, journal bearing surface) 1021 being radially directed towards of sinter layer 102 it
Between be formed with journal bearing gap 60(and see Fig. 6).Supplying from pump to the air of air axle 10
After beginning, sprayed by from the outer peripheral edge surface 1021 being radially directed towards of porous sintered layer 102
The compressed air gone out forms pressure-air film in journal bearing gap 60.The pressure of air film props up
Support radial load.It is advantageous herein that two grooves 1043 are located so that pressure is radially
The whole region of bearing clearance 60 keeps the highest.Such as, two grooves 1043 can position
In the centre position (position at h/2) away from journal bearing part 104, towards base portion portion
Points 103 and bar part 105 position in.
Further, journal bearing part 104 height (ledge surface 1034 and 1041 it
Between distance) h is designed to than from the end face 241 of the wheel hub 24 of pulley 20 end to wheel hub 25
Distance (thickness of pulley 20) the big specified value of t in face 251.Therefore, it is supplied at air
After, the thrust bearing gap 61a connected with journal bearing gap 60 is formed at the one of pulley 20
End face 251 and the ledge surface (upper end of base segments 103) 1034 of individual wheel hub 25
Between, this pulley 20 is placed in journal bearing part 104, and this ledge surface 1034 pushes away
The effect of power bearing surface, and by between journal bearing part 104 and base segments 103
External diameter difference causes.Similarly, the thrust bearing gap 61b connected with journal bearing gap 60
It is formed at end face 241 and thrust plate 11 as described below of another wheel hub 24 of pulley 20
Between one surface 111, the effect of thrust bearing surface is played on this surface 111, and with platform
Surface, rank (upper end of journal bearing part 104) 1041 contacts, this ledge surface 1041
(see figure 6) is formed by the external diameter difference between journal bearing part 104 and bar part 105.For
Prevent the generation of self-excited vibration, it is advantageous to by repairing the end of journal bearing part 104
The marginal portion 10411 in face 1041 and do not become blunt edge, improve the assembling of thrust plate 11
Precision.
Bar part 105 is continuously formed with the upper end 1041 of journal bearing part 104, and
And be inserted in the shaft insertion hole as described below 113 of thrust plate 11.Further, in bar part
In the end sections of 105, form the threaded portion 1051 treating to be threadedly engaged with nut 12.
Fig. 5 (A) is front view, it is shown that thrust plate 11, and Fig. 5 (B) is Fig. 5 (A)
B-B cross section.
As it can be seen, thrust plate 11 has outside the base segments 103 of diameter and air axle 10
The approximately uniform cylinder form in footpath.Shaft insertion hole 113 position that axes O 1 is passed through wherein
Place is formed in thrust plate 11, and this shaft insertion hole 113 passes thrust plate 11 from a surface 111
To another surface 112.The bar part 105 of air axle 10 is inserted in shaft insertion hole 113.
Correspondingly, the internal diameter r2 of shaft insertion hole 113 is designed to the bar part 105 than air axle 10
External diameter R2 is big.
In this arrangement, first air axle 10 is inserted in pulley 20, thus air axle
The journal bearing part 104 of 10 is positioned in the air shaft insertion hole 23 of pulley 20.Then,
Air axle 10(pulley 20 is placed on this air axle 10) it is further inserted into thrust plate 11
In, thus the bar part 105 of air axle 10 is positioned in the shaft insertion hole 113 of thrust plate 11.
When in this state nut 12 being fastened to the spiral shell that is formed in the end sections of bar part 105
Time in stricture of vagina part 1051, thrust plate 11 is fixed therein a surface 111 and ledge surface
(upper end of journal bearing part 104) 1041 position contacted, this ledge surface
1041 are formed by the external diameter difference between journal bearing part 104 and bar part 105.Due to such as
As described above, journal bearing part 104 than the long specified value of thickness t of pulley 20,
So when compressed air flows, thrust bearing gap 61a is formed at pulley 20
The upper end (thrust bearing surface) of end face 251 and base segments 103 of a wheel hub 25
Between 1034, and thrust bearing gap 61b is formed at another wheel hub 24 of pulley 20
Between end face 241 and a surface (thrust bearing surface) 111 of thrust plate 11.From radially
The compressed air that bearing clearance 60 is discharged flows in 61a and 61b of these thrust bearing gaps, and
And form pressure-air film.The pressure support thrust load of this pressure-air film.
Here, the height h of journal bearing part 104 is arranged so that on the both sides of pulley 20
The thickness s(of thrust bearing gap 61a and 61b see Fig. 6) specific diameter is to bearing clearance 60
Thickness arrives greatly the degree not being produced from excited vibration." there is the thickness of the degree not being produced from excited vibration
Thrust bearing gap 61a and 61b of s " it is such thrust bearing gap 61a and 61b, i.e.
61a and 61b is sufficiently wide in thrust bearing gap, in order to when pulley 20 is transported by slight thrust direction
Dynamic slightly closer to during another thrust bearing surface 1034,111 (as at no-load condition
Under in pulley 20 occur as), do not cause pulley 20 axial thrust bearing surface 111,1034
One of quickly push back.Such as, the external diameter of the wheel hub 24 and 25 of pulley 20 is about wherein
In the case of the thickness in 22mm and journal bearing gap 60 is about 9-10 μm, by inciting somebody to action
The height h of journal bearing part 104 is arranged so that the thickness of thrust bearing gap 61a and 61b
Degree s becomes to be about 2.5-37 μm and further by (its air supplies by compressed-air actuated flow
0.5Mpa to pressure) adjust unlimited flow be 520NL/hr or less scope in,
Prevent the generation of self-excited vibration.
Support pulley 20 during air axle 10 is supplied air to it follows that will be described in
State.
Fig. 6 is view, schematically illustrates and props up during supplying air to air axle 10
The state of support pulley 20.
As it can be seen, under assembled state (state that figure 1 illustrates) with pulley
In air bearing unit 1, when the air supply pipe (not shown) of pump is connected to air axle 10
Air supply opening 107, and when being initially supplied compressed air t coming from pump, then
It is supplied to be positioned at by air flue 106 and the hole 1044 of air axle 10 by compressed air t
Each groove 1043 on the dorsal part of porous sintered layer 102, and from porous sintered layer 102
The outer peripheral edge surface 1021 being radially directed towards is ejected in journal bearing gap 60.Therefore, high
Pressure air film is formed in journal bearing gap 60, and its pressure support radial load.Accordingly
Ground, pulley 20 motion in radial directions is restricted.
Further, compressed air t in journal bearing gap 60 is along porous sintered layer 102
The outer peripheral edge surface (journal bearing surface) 1021 being radially directed towards flows to the one of thrust plate 11
Side, individual surface (thrust bearing surface) 111 and the upper end (thrust axis of base segments 103
Hold surface) 1034 sides, and flow to pulley 20 another wheel hub 24 end face 241 with push away
In thrust bearing gap 61b between the thrust bearing surface 111 of power plate 11, and it is flowed into
The end face 251 of one wheel hub 25 of pulley 20 and the thrust bearing surface of base segments 103
In thrust bearing gap 61a between 1034.
Compressed air t1 having flowed in 61a and 61b of thrust bearing gap flows to respective wheel
The outer peripheral edge of hub 24 and 25, and it is ultimately drained into outside (atmospheric pressure).Each thrust
Pressure in bearing clearance 61a, 61b is higher on the inner circumference side of pulley 20 (from radially
Compressed air t1 that bearing clearance 60 is discharged flows in this inner circumference side), and to wheel hub
The outer peripheral edge of 24 and 25 is gradually reduced.Therefore, the air film of higher average pressure is formed
In 61a and 61b of thrust bearing gap, and the pressure support thrust load of air film.Phase
Ying Di, the pulley 20 motion in thrust direction is restricted.
Here, in the case of the thickness s of thrust bearing gap 61a and 61b is the least wherein,
The light exercise of the axes O 1 of pulley 20 radially bearing portions 104 makes thrust bearing gap
One of 61a and 61b is thinner, and makes another of thrust bearing gap 61b and 61a thicker.
Thus the pressure distribution in 61a and 61b of thrust bearing gap that changes is to be produced from excited vibration
Probability.In detail, pressure is owing to becoming narrower thrust bearing gap 61a, 61b
In the increase of resistance and raise, and pressure is owing to becoming broader thrust bearing gap
The reduction of the resistance in 61a, 61b and reduce, thus even when pulley 20 slightly closer to
During one thrust bearing surface, the axes O 1 of pulley 20 the most radially bearing portions 104 is moved,
It is pushed back to another thrust bearing surface side.Such motion repeats.
The present embodiment provides thrust bearing gap 61a, 61b, this thrust bearing gap 61a, 61b
Allow enough move places, in order to even when pulley 20 is slightly to another thrust bearing
During the motion of surface 1034,111, it is also prevented from pulley 20 axial thrust bearing surface 111,1034 fast
Push back fastly, and thus be possible to prevent the generation of self-excited vibration.
Thus, according to the air bearing unit 1 with pulley of the present embodiment, compressed air from
The porous sintered layer 102 relative with the inner peripheral surface 28 of pulley 20 is supplied to journal bearing
Gap 60, and while keeping compressed-air actuated pressure, will be from journal bearing gap 60
Thrust bearing gap 61a and 61b that the compressed air discharged is incorporated on the both sides of pulley 20
In.Correspondingly, by pressure and the thrust bearing gap of the air film in journal bearing gap 60
The pressure of the air film in 61a and 61b can be without supporting contiguously pulley 20 radial load and
Thrust load.Therefore, power loss occurs hardly, and thus pulley 20 can turn at high speeds
Dynamic.Further, the compressed air owing to discharging from journal bearing gap 60 is used at thrust bearing
Gap 61a and 61b forms air film, so need not be individually formed for by compressed air
The discharge groove discharged from journal bearing gap 60, and also need not be provided separately for pressing
Contracting air is ejected into the porous sintered layer of thrust bearing gap 61a and 61b.Therefore, it is possible to it is real
Now support the simplification of the structure of the air bearing unit 1 with pulley of high-speed rotation pulley 20,
And realize the reduction of the production cost of the air bearing unit 1 with pulley.
Further, according to the air bearing unit 1 with pulley of the present embodiment, it is sufficient that,
Compressed air is ejected into from journal bearing surface 1021 journal bearing gap 60, and thus not
Must be attached thick porous body, this thickness porous body is used for from thrust bearing surface 1034 and 111 He
Each jet compression air on journal bearing surface 1021.Thus, it being sufficient that, porous is burnt
Knot layer 102 forms with metal base 101, and the thickness of this porous sintered layer 102 is little to be reached
Several millimeters (such as, about 2.5mm).It is thereby achieved that the compact sky with pulley
Gas bearing unit 1.
Further, according to the air bearing unit 1 with pulley, porous sintered layer 102 is formed
On the sidepiece of air axle 10.Correspondingly, about the pulley 20 as support object, enough
, form the air shaft insertion hole 23 being used for inserting air axle 10, and be not necessarily forming all
Special part such as flange.Become therefore, it is possible to reduce the production as the pulley 20 changing parts
This, and reduce operating cost.
Further, the thickness s making thrust bearing gap 61a and 61b arrives greatly and is not produced from exciting
Dynamic degree, and thus it is possible to prevent the generation of self-excited vibration.Therefore, it can high-speed rotation
Pulley 20 is stablely supported under contactless state.
Above, the present embodiment used for support pulley 20 with pulley
Air bearing unit 1.However, it is possible to support the parts in addition to pulley 20, condition is requirement
The parts of high-speed rotation are lighter.
Further, the present embodiment has used wherein as the pulley 20 supporting object
By the outer peripheral edge surface support of air axle 10 situation under contactless state.But, this
Bright can be applicable to cylindrical air bearing, this cylindrical air bearing is by the inside in air bearing
Porous sintered layer on periphery supports as the axle supporting object.In this case, enough
It is that flange or the like is previously formed on the both sides as the axle supporting object, thus from many
The compressed air that the inner peripheral surface of hole sinter layer ejects, by porous sintered layer
The journal bearing formed between portion's peripheral edge surface and the outer peripheral edge surface as the axle of support object
The inside in gap flows to the both sides of air bearing, and flows in the end face of air bearing and conduct
In thrust bearing gap between the flange of the axle supporting object.
Industrial applicability
The present invention can be used for example as compact air bearing unit, this compact air bearing unit letter
High-speed rotating component is more stably supported under contactless state by single structure.
List of numerals
1: with the air bearing unit of pulley, 20: pulley, 21,22: the upside of pulley and
Downside surface, 23: air shaft insertion hole, 24,25: wheel hub, 26:V connected in star, 28:
The inner peripheral surface of pulley, 29: the outer peripheral edge surface of pulley, 241,251: wheel hub
End face, 10: air axle, 101: metal base, 102: porous sintered layer, 103: base portion portion
Point, 104: journal bearing part, 105: bar part, 106: air flue, 107: air
Supply opening, 1021: the outer peripheral edge surface (journal bearing surface) of porous sintered layer, 1031:
The lower surface of base segments, 1032: screw hole, 1033: the outer peripheral edge table of base segments
Face, 1034: the end face (ledge surface) of base segments, 1041: the end face of journal bearing part
(ledge surface), 1042: the outer peripheral edge surface of journal bearing part, 1043: groove, 1044:
Hole, 1051: threaded portion, 1061: the opening of air flue, 1071: threaded portion, 11:
Thrust plate, 111,112: the surface, the upper side and lower side of thrust plate, 113: shaft insertion hole, 12:
Nut.
Claims (4)
1. an air bearing unit, described air bearing unit by journal bearing gap and
Fluid film in first thrust bearing gap supports rotor with being not in contact with, this rotor around
Axis rotates in rotation direction, and wherein air bearing unit includes:
Metal base, described metal base has: first surface, and described first surface is around institute
State axis, and between first surface and rotor, form described journal bearing gap；With
Two surfaces, described second surface is adjacent with first surface, and second surface and rotor it
Between form described first thrust bearing gap, described first thrust bearing gap is connected to described footpath
In bearing clearance end side；With
Porous layer, described porous layer becomes on whole described first surface without step topography to cover
Cover described first surface, and outer peripheral edge surface the most with the level for fluid is supplied to described
Journal bearing gap, in order to form fluid film in described journal bearing gap；And
Fluid flows to described first thrust bearing gap in described journal bearing gap, and from
Described journal bearing gap is discharged to described first thrust bearing gap, thus at the first thrust axis
Hold formation fluid film in gap.
Air bearing unit the most according to claim 1, wherein said air bearing unit
Including:
Air axle, described air axle includes: described metal base, and described metal base includes making
Outer peripheral edge surface for first surface and the ledge surface as second surface, this second surface
Stretch out from first surface；The most with the level many be formed on whole described first surface
Aperture layer；Air axle is inserted into the second end having the first end face He being positioned on the first end face opposite side
In the hole of the rotor in face, thus described journal bearing gap is formed at the inner circumference of rotor
Between surface and the outer peripheral edge surface the most with the level of described porous layer, and described first pushes away
Power bearing clearance be formed at described ledge surface and first end face relative with described ledge surface it
Between, this first thrust bearing gap is connected to an end in journal bearing gap；With
Thrust plate, described thrust plate has for being inserted by the air axle in the hole being inserted into rotor
The insertion hole entered, and contact described many when inserting in the hole described in air axle is inserted into
The end face of aperture layer, in order to form the second thrust bearing gap between the second end face and thrust plate,
Described second thrust bearing gap is connected to another end side in described journal bearing gap；And
And
Fluid flows between the first thrust bearing gap and the second thrust bearing in journal bearing gap
Gap, and be discharged between the first thrust bearing gap and the second thrust bearing from journal bearing gap
Gap,
Thus the fluid discharged is in the first thrust bearing gap and the second thrust bearing gap
Each is formed fluid film.
Air bearing unit the most according to claim 1 and 2, including:
Pulley as described rotor.
4. the air axle that a kind is used in air bearing unit according to claim 2.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011208855A JP5851780B2 (en) | 2011-09-26 | 2011-09-26 | Air bearing unit |
| JP2011-208855 | 2011-09-26 | ||
| PCT/JP2012/062517 WO2013046793A1 (en) | 2011-09-26 | 2012-05-16 | Air bearing unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103827527A CN103827527A (en) | 2014-05-28 |
| CN103827527B true CN103827527B (en) | 2016-11-16 |
Family
ID=47994860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280046551.0A Active CN103827527B (en) | 2011-09-26 | 2012-05-16 | Air bearing unit |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5851780B2 (en) |
| KR (1) | KR20140066777A (en) |
| CN (1) | CN103827527B (en) |
| WO (1) | WO2013046793A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014035054A (en) * | 2012-08-10 | 2014-02-24 | Oiles Ind Co Ltd | Static pressure gas bearing unit |
| JP6288999B2 (en) * | 2013-09-17 | 2018-03-07 | オイレス工業株式会社 | Static pressure gas bearing device |
| EP3096049A4 (en) * | 2014-01-14 | 2017-07-05 | NSK Ltd. | Rotating mechanism, machine tool, and semiconductor production device |
| DE102015010875B9 (en) * | 2015-08-25 | 2016-12-29 | Thermo Electron (Karlsruhe) Gmbh | Rheometer with gas bearing |
| CN113176037A (en) * | 2016-08-10 | 2021-07-27 | 国际计测器株式会社 | Dynamic balance testing machine |
| US11067124B2 (en) * | 2018-07-23 | 2021-07-20 | Alio Industries, Inc. | Planar rotary air bearing stage |
| CN110686008B (en) * | 2019-09-16 | 2021-01-05 | 武汉科技大学 | Visual high-pressure quartz glass disc gas bearing and use method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03292413A (en) * | 1990-04-06 | 1991-12-24 | Nippon Seiko Kk | Bearing unit made of porous material |
| DE4241507A1 (en) * | 1992-12-10 | 1994-06-16 | Schurr Stahlecker & Grill | Open-end spinning rotor shaft bearing mountings - has porous sintered bodies as bearing surfaces for aerostatic radial and thrust bearings |
| JPH11159532A (en) * | 1997-12-01 | 1999-06-15 | Ntn Corp | Guide roller for supporting hydrostatic bearing |
| JP3667108B2 (en) * | 1998-08-31 | 2005-07-06 | 京セラ株式会社 | Filament guide roller |
| DE102005007297B4 (en) * | 2005-02-17 | 2007-05-31 | Minebea Co., Ltd. | Fluid dynamic air bearing system for pivotal mounting of an engine |
| CN200991756Y (en) * | 2006-12-18 | 2007-12-19 | 广州市大族高精电机有限公司 | Main axle device |
-
2011
- 2011-09-26 JP JP2011208855A patent/JP5851780B2/en active Active
-
2012
- 2012-05-16 WO PCT/JP2012/062517 patent/WO2013046793A1/en active Application Filing
- 2012-05-16 CN CN201280046551.0A patent/CN103827527B/en active Active
- 2012-05-16 KR KR1020147010958A patent/KR20140066777A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013046793A1 (en) | 2013-04-04 |
| CN103827527A (en) | 2014-05-28 |
| JP2013068307A (en) | 2013-04-18 |
| KR20140066777A (en) | 2014-06-02 |
| JP5851780B2 (en) | 2016-02-03 |
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