KR20150038502A - Gas-static bearing unit - Google Patents
Gas-static bearing unit Download PDFInfo
- Publication number
- KR20150038502A KR20150038502A KR20157005284A KR20157005284A KR20150038502A KR 20150038502 A KR20150038502 A KR 20150038502A KR 20157005284 A KR20157005284 A KR 20157005284A KR 20157005284 A KR20157005284 A KR 20157005284A KR 20150038502 A KR20150038502 A KR 20150038502A
- Authority
- KR
- South Korea
- Prior art keywords
- shaft
- radial bearing
- thrust
- bearing
- air
- Prior art date
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Classifications
-
- 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
- F16C32/0618—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 via porous material
-
- 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
- F16C32/0622—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 via nozzles, restrictors
-
- 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
- F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
- F16C32/0685—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for radial load only
-
- 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
- F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
- F16C32/0696—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for both radial and axial load
-
- 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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/20—Application independent of particular apparatuses related to type of movement
- F16C2300/22—High-speed rotation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
A structure of a compact static pressure gas bearing unit that supports a rotating body rotating at a high speed in a simple structure and stably supports noncontact is provided. The two shaft holders 3A and 3B fix the air shaft unit 1 that supports the pulley 2 in a noncontact manner at both ends 113 and 12 thereof. The base body f is supplied from the radial bearing surface 1121 of the air shaft unit 1 to the radial bearing gap 60 between the radial bearing surface 1121 and the inner peripheral surface 221 of the pulley 2, The gas film f is formed in the bearing gap 60 and the thrust bearing surfaces 1132 and 121 of the air shaft unit 1 are connected to the radial bearing gap 60 from the radial bearing gap 60. [ And the thrust bearing clearances 61a and 61b between the boss end surfaces 241A and 241B of the pulley 2. A gas film is also formed in the thrust bearing gaps 61a and 61b by using the exhaust f1.
Description
BACKGROUND OF THE
The air bearing unit is provided with a porous limiter for receiving a thrust load and a radial load of the shaft on respective bearing surfaces (thrust bearing surface and radial bearing surface), respectively, at both end sides of the inner periphery of a cylindrical housing into which a shaft Air bearing (static air bearing) of a restriction type (a porous body such as a porous graphite) are respectively provided. Here, the radial bearing surface is opposed to the outer peripheral surface of the shaft, and a radial bearing gap is formed between the radial bearing surface and the outer peripheral surface of the shaft. The thrust bearing surface is opposed to the flange formed on the outer periphery of the shaft, Thereby forming a gap.
Here, for each air bearing, an exhaust groove is formed in the circumferential direction on the inner circumferential surface of the housing on the side opposite to the thrust bearing surface (the center side of the inner circumferential surface of the housing) with the radial bearing surface of the air bearing therebetween, An exhaust hole penetrating through the outer peripheral surface of the housing is formed in the groove bottom. An exhaust hole is formed on the outer circumferential surface of the shaft at a position near the thrust bearing surface of the air bearing in the circumferential direction and an exhaust hole for connecting the exhaust groove to the exhaust groove on the inner circumferential surface of the housing Respectively.
In this configuration, the air supplied to the air bearing is ejected from the thrust bearing surface and the radial bearing surface of the air bearing, respectively. The air ejected from the thrust bearing surface flows inside the thrust bearing gap toward the outer periphery of the flange and is released to the outside from the thrust bearing gap. On the other hand, the air ejected from the radial bearing surface flows into the radial bearing clearance toward the exhaust grooves near the thrust bearing surface and the exhaust grooves on the opposite side of the thrust bearing surface, and flows into these exhaust grooves, And is exhausted to the outside of the housing.
However, in the air bearing unit described in
Further, since the exhaust hole on the shaft side is formed along the axial direction of the shaft so as to connect the exhaust groove on the outer circumferential surface of the shaft and the exhaust groove on the inner circumferential surface of the housing, a somewhat large thickness is required for the shaft. For this reason, when the shaft becomes heavy, for example, the shaft may roll due to its own weight. Since the radial bearing gap formed between the radial bearing surface of the inner periphery of the housing (static pressure air bearing) and the outer peripheral surface of the shaft is very narrow, when the shaft is bent, the shaft and the air bearing come into contact with each other, There is a possibility that it can not be maintained.
However, if a rotating body such as a pulley rotating at a high speed is held by an air bearing, self-excited vibration may occur at the time of supply of air. As a result, resonance of the system results in, for example, obstruction of stable running of the transported object.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure of a both-end support type hydrostatic bearing unit in which a rotating body rotating at high speed is supported by a simple structure in a more non-
In order to solve the above problems, according to the present invention, a shaft unit inserted into a shaft insertion hole formed in an axial direction of the rotating body and supporting the rotating body in a noncontact manner is provided with a shaft- Fix at the inserted position from both sides. A radial bearing gap between the radial bearing surface and the inner circumferential surface of the shaft insertion hole of the rotating body is formed in the radial bearing gap between the radial bearing surface and the inner circumferential surface of the shaft insertion hole of the rotating body by the gas ejected from the radial bearing surface formed on the outer circumferential surface of the shaft unit, A gas film is formed and the gas is exhausted from the radial bearing gap into the thrust bearing gap between the thrust bearing surface of the shaft unit and each end surface of the rotating body. The exhausted gas is used to form a gas film in the gap of the thrust bearing.
For example, the present invention is a static pressure gas bearing unit for supporting a rotating body rotating in a direction about a shaft center in a noncontact manner by a gas film interposed between a radial bearing gap and a gap between the first and second thrust bearings,
A shaft unit inserted into a shaft insertion hole passing through both end faces of the rotating body,
And shaft holding means for holding the shaft unit at positions on both sides of the shaft insertion hole of the rotating body,
The shaft unit includes:
A radial bearing surface for forming the radial bearing gap between the inner peripheral surface of the shaft insertion hole and the inner peripheral surface and for ejecting a base for forming the gas film in the radial bearing gap,
And a radial bearing surface which is adjacent to the radial bearing surface and which is opposed to one end surface of the rotating body and which is connected to one end side of the radial bearing gap, A first thrust bearing surface forming a bearing gap,
And a second thrust bearing gap which is adjacent to the radial bearing surface and which is opposite to the other end surface of the rotating body and which is connected to the other end side of the radial bearing gap, Having a second thrust bearing surface,
The gas,
The radial bearing gap is discharged toward the first thrust bearing gap and the second thrust bearing gap to be exhausted from the radial bearing gap to the first thrust bearing gap and the second thrust bearing gap, The gas film is formed in the first thrust bearing gap and in the second thrust bearing gap, respectively.
According to the present invention, the compressed gas exhausted from the radial bearing gap formed between the inner circumferential surface of the shaft insertion hole of the rotating body and the radial bearing surface formed on the outer circumferential surface of the shaft unit, which faces the inner circumferential surface of the shaft insertion hole of the rotating body, Is supplied to the gap of the thrust bearing formed between each end surface of the rotating body and the thrust bearing surface of the shaft unit and then exhausted and used to form the gas film in the clearance between the thrust bearings, It is not necessary to separately provide a groove and a hole for ejecting the compressed gas, and a thrust bearing surface for ejecting the compressed gas to the clearance between the thrust bearings. Further, since the shaft unit for non-contact supporting the rotating body is fixed at both ends, even if the shaft unit is long in correspondence with the size of the rotating body, the warping can be suppressed and contact between the rotating body and the shaft unit can be prevented . Therefore, it is possible to realize a both-end support type constant-pressure gas bearing unit capable of supporting a rotating body rotating at a high speed with a simple structure and in a more non-contactable manner stably.
1 is an external view (without a pulley 2) of an air bearing
Fig. 2 is a side view of the air bearing
3 (A) is a front view of the
4 is a developed view of the parts of the
5 (A) is a front view of the
6 (A) is a front view of the
7 is a diagram schematically showing the state of support of the
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the overall structure of both end-support type static-pressure gas bearing units according to this embodiment will be described. Here, an air bearing
Fig. 1 is an external view of the both end support type air bearing
As shown in the figures, the air bearing
As will be described later, the
On the other hand, the two
Each of the
(The
In the present embodiment, two
Next, the
3 (A) is a front view of the
As shown in the figure, the
As shown in the figure, ring-shaped
4 is a part development view of the
As shown in the figures, the
5 (A) is a front view of the
As shown in the figure, the
The
An
The
The
The number and layout of the ring-shaped
The
The length t4 of the radial bearing portion 114 (the distance between the stepped
The
6 (A) is a front view of the
As shown in the figure, the
On the other hand, the
First, the
Thereafter, the shaft center O of the
Since the length t4 of the
Here, the length t4 of the
Next, the supporting state of the
7 is a diagram schematically showing the support state of the
As shown in the figure, in the
The compressed air f in the
The compressed air f1 flowing into the
When the thickness s1 of the
In the present embodiment, even if the
As described above, according to the
Since the porous sintered layer for ejecting the compressed air to the
Since the
Further, since it is not necessary to form the exhaust hole along the axis O in the
In the
Since the
Further, since the thickness s1 of the
In this embodiment, the
As described above, in the present embodiment, the
[Industrial applicability]
INDUSTRIAL APPLICABILITY The present invention can be used as both end support type air bearing units suitable for noncontact support of a rotating body such as a pulley for sending wire materials such as optical fibers and carbon fibers.
1: Air shaft unit,
2: pulley,
3A, 3B: Shaft holder,
4: Air bearing unit,
11: Air shaft,
12: thrust plate,
13: Nut,
21: flange portion,
22: hole for inserting air shaft,
23: outer circumference of the boss,
24A and 24B: bosses,
25A, 25B: end face of the pulley,
111: Back metal,
112: porous sintered layer,
113: base portion,
114: Radial bearing part,
115:
116: By ventilation,
117:
118: threaded portion,
121: cross-section of thrust plate (thrust bearing surface),
122: cross-section of thrust plate,
123: hole for shaft insertion,
221: inner circumference of the pulley,
241A, 241B: cross-section of the boss,
1121: outer peripheral surface (radial bearing surface) of the porous sintered layer,
1131: cross section of base portion,
1132: Cross section of the base portion (step surface, thrust bearing surface)
1141: Cross section (stepped surface) of the radial bearing part,
1142: outer peripheral surface of the radial bearing portion,
1143: ring shaped groove,
1144: hole,
1151:
Claims (4)
A shaft unit inserted into a shaft insertion hole passing through both end faces of the rotating body;
And shaft holding means for holding the shaft unit at positions on both sides of the shaft insertion hole of the rotating body,
The shaft unit includes:
A radial bearing surface for forming the radial bearing gap between the inner peripheral surface of the shaft insertion hole and the inner peripheral surface and for ejecting a base for forming the gas film in the radial bearing gap,
A first thrust bearing which is adjacent to the radial bearing surface and which is opposite to one end surface of the rotating body and which is connected to one end side of the radial bearing gap, A first thrust bearing surface forming a gap,
And a second thrust bearing gap which is adjacent to the radial bearing surface and which is opposite to the other end surface of the rotating body and which is connected to the other end side of the radial bearing gap, Having a second thrust bearing surface,
The gas,
The radial bearing gap is discharged toward the first thrust bearing gap and the second thrust bearing gap to be exhausted from the radial bearing gap to the first thrust bearing gap and the second thrust bearing gap, And the gas film is formed in the first thrust bearing gap and in the second thrust bearing gap, respectively.
The shaft unit includes:
And a porous layer formed on an outer circumferential surface of the radial bearing portion and having a stepped portion having a radial bearing portion having a diameter smaller than that of the base portion formed on an end surface of the base portion, And the radial bearing surface is formed between the base portion and the radial bearing portion between the radial bearing portion and the inner peripheral surface of the shaft insertion hole of the rotating body, A shaft for forming the first thrust bearing gap between the one end surface of the rotating body and the stepped surface of the thrust bearing surface as the first thrust bearing surface,
And a second thrust bearing surface that is fixed to an end surface of the radial bearing portion and faces the other end surface of the rotating body as the second thrust bearing surface, And a thrust plate which forms the thrust plate,
Wherein the shaft holding means comprises:
And the thrust plate is fixed to the base portion of the shaft.
Wherein the rotating body has a pulley having a dimension in the axial direction longer than a dimension in the radial direction.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPJP-P-2012-178123 | 2012-08-10 | ||
JP2012178123A JP2014035054A (en) | 2012-08-10 | 2012-08-10 | Static pressure gas bearing unit |
PCT/JP2013/069767 WO2014024666A1 (en) | 2012-08-10 | 2013-07-22 | Gas-static bearing unit |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20150038502A true KR20150038502A (en) | 2015-04-08 |
Family
ID=50067900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR20157005284A KR20150038502A (en) | 2012-08-10 | 2013-07-22 | Gas-static bearing unit |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2014035054A (en) |
KR (1) | KR20150038502A (en) |
CN (1) | CN104541077B (en) |
TW (1) | TWI622715B (en) |
WO (1) | WO2014024666A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104614137B (en) * | 2015-01-15 | 2016-08-31 | 浙江大学 | Three-component standard vibration machine based on static pressure air-bearing decoupling device |
DE102015010875B9 (en) * | 2015-08-25 | 2016-12-29 | Thermo Electron (Karlsruhe) Gmbh | Rheometer with gas bearing |
JP6830263B2 (en) * | 2016-08-10 | 2021-02-17 | 国際計測器株式会社 | Dynamic balance tester |
CN109955097B (en) * | 2017-12-22 | 2020-09-01 | 上海理工大学 | Static pressure hemisphere bearing shafting and precision machine tool |
US11067124B2 (en) * | 2018-07-23 | 2021-07-20 | Alio Industries, Inc. | Planar rotary air bearing stage |
CN111285031B (en) * | 2020-03-11 | 2021-09-14 | 上海精测半导体技术有限公司 | Rotating platform |
CN111637159A (en) * | 2020-05-18 | 2020-09-08 | 哈尔滨工程大学 | Self-adaptive forced lubrication bearing with pressurizing hole |
CN111637161B (en) * | 2020-05-18 | 2021-11-09 | 哈尔滨工程大学 | Forced lubrication bearing with distributed pores |
CN111637160B (en) * | 2020-05-18 | 2021-11-05 | 哈尔滨工程大学 | Forced lubrication bearing with uneven aperture |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5026251U (en) * | 1973-07-02 | 1975-03-26 | ||
JPH03292413A (en) * | 1990-04-06 | 1991-12-24 | Nippon Seiko Kk | Bearing unit made of porous material |
JPH0547543U (en) * | 1991-11-29 | 1993-06-25 | 豊田工機株式会社 | Rotating device |
JP3653832B2 (en) * | 1995-12-06 | 2005-06-02 | 日本精工株式会社 | Static pressure gas bearing type rotation guide device |
JPH11257467A (en) * | 1998-03-06 | 1999-09-21 | Fujiwara:Kk | Pulley |
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 |
JP5812316B2 (en) * | 2010-10-29 | 2015-11-11 | オイレス工業株式会社 | Roll device |
JP5851780B2 (en) * | 2011-09-26 | 2016-02-03 | オイレス工業株式会社 | Air bearing unit |
-
2012
- 2012-08-10 JP JP2012178123A patent/JP2014035054A/en active Pending
-
2013
- 2013-07-02 TW TW102123628A patent/TWI622715B/en active
- 2013-07-22 KR KR20157005284A patent/KR20150038502A/en not_active Application Discontinuation
- 2013-07-22 WO PCT/JP2013/069767 patent/WO2014024666A1/en active Application Filing
- 2013-07-22 CN CN201380041777.6A patent/CN104541077B/en active Active
Also Published As
Publication number | Publication date |
---|---|
TWI622715B (en) | 2018-05-01 |
TW201420907A (en) | 2014-06-01 |
CN104541077B (en) | 2018-05-08 |
CN104541077A (en) | 2015-04-22 |
WO2014024666A1 (en) | 2014-02-13 |
JP2014035054A (en) | 2014-02-24 |
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Legal Events
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E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |