CN113623320B - Foil air slide bearing - Google Patents
Foil air slide bearing Download PDFInfo
- Publication number
- CN113623320B CN113623320B CN202110498950.1A CN202110498950A CN113623320B CN 113623320 B CN113623320 B CN 113623320B CN 202110498950 A CN202110498950 A CN 202110498950A CN 113623320 B CN113623320 B CN 113623320B
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- Prior art keywords
- foil
- top foil
- end portion
- circumferential direction
- curved surface
- Prior art date
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Classifications
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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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
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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
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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
- F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
- F16C32/0677—Details of hydrostatic bearings independent of fluid supply or direction of load of elastic or yielding bearings or bearing supports
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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
- F16C32/0681—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
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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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Support Of The Bearing (AREA)
Abstract
The present invention relates to a foil air slide bearing including a bearing housing, a wave foil provided inside the bearing housing, and a tip foil provided inside the wave foil, wherein a free end, i.e., the other end of the tip foil is formed to exceed the other end in a direction in which a curved surface portion extends with reference to the one end fixed to the bearing housing, such that the other end of the tip foil is arranged to overlap the one end in a circumferential direction, and an inner side surface of the other end of the tip foil is arranged at a position radially outward of an extension line formed by an inner circumferential surface of the curved surface portion, whereby when a rotor arranged inside the tip foil rotates at a high speed, a flow of air flowing along with the rotor becomes unstable at the free end of the tip foil, thereby suppressing occurrence of vibration of the tip foil and preventing abnormal vibration of the rotor.
Description
Technical Field
The present invention relates to a foil air slide bearing (Air foil journal bearing) configured to support a radial load of a rotor, which is capable of suppressing abnormal vibration of the rotor rotating at a high speed, thereby ensuring dynamic stability.
Background
Foil air bearings refer to: with high-speed rotation of the rotor (or the rotary shaft), air, which is a viscous fluid, flows between foils in contact with the rotor or a bearing disk (bearing disk) to form pressure, thereby supporting a bearing of a load.
In the foil air bearing, the foil air slide bearing is a bearing configured to support a load in a direction perpendicular to the rotor, that is, in a radial direction of the rotor.
As shown in fig. 1, a general Foil air slide bearing is configured such that a Bump Foil 2 is provided along an inner peripheral surface 1b of a hollow portion 1a of a bearing housing 1, a Top Foil 3 is disposed inside the Bump Foil 2, and a rotor 4 (or a rotary shaft) is disposed inside the Top Foil 3, so that the rotor can rotate in a state in which the inner peripheral surface of the Top Foil 3 is spaced apart from an outer peripheral surface of the rotor 4. The corrugated foil 2 and the top foil 3 are formed with bent portions in such a manner that one end in the circumferential direction is bent outward in the radial direction, and the bent portions 2a and 3a are inserted into the grooves 1c formed in the bearing housing 1 and fixed. In this way, the rotor is supported by its own weight in contact with the lower side of the inner peripheral surface of the top foil in a state where the rotor is stationary, and then, when the rotor is rotated and started, the rotor floats upward from the lower side of the inner peripheral surface of the top foil as the pressure of the air between the lower side of the rotor and the top foil increases.
In an industrial machine using such a foil air slide bearing, the rigidity of the lower portion side of the foil air slide bearing, which is a portion to which the load of the rotor acts, is very important, but in order to cope with various required elements such as an automobile, the importance of the rigidity of the upper portion side of the foil air slide bearing is also increasingly highlighted.
However, in a general foil air slide bearing, one end portion of the top foil is fixed to the upper portion side of the bearing housing, and the other end portion is formed as a free end so as to be separated from the rigid support portion of the wave foil. That is, the other end portion of the top foil is not supported or fixed to the wave foil and the bearing housing, but is kept suspended in the hollow space.
As a result, if the rotor rotates at a high speed, the flow of air flowing along with the rotor becomes unstable at the free end of the top foil, and therefore, there is a problem that the rotor is not only vibrated as a rotor, which is the rotating body, but also the top foil is vibrated, and abnormal vibration of the rotor is caused.
Prior art literature
Patent document 1: JP 2011-169413A (2011.09.01.)
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a foil air slide bearing in which the flow disturbance of air flowing along with the rotation of a rotor is minimized at the top foil free end of the foil air slide bearing configured to support the radial load of the rotor, thereby suppressing the occurrence of vibration of the top foil and the rotor.
To achieve the above object, a foil air slide bearing of the present invention may comprise: a bearing housing having a hollow portion in which the rotor is disposed; a wave foil provided inside the bearing housing and formed in a circumferential direction, the wave foil being formed with an elastic wave portion having a concave-convex shape and coupled to the bearing housing; and a top foil provided inside the wave foil and having a curved surface portion formed along a circumferential direction, wherein one end portion of the top foil in the circumferential direction is fixed to the bearing housing, the other end portion of the top foil is formed as a free end, the free end, i.e., the other end portion of the top foil is formed to exceed the other end portion in a direction in which the curved surface portion extends with reference to the one end portion fixed to the bearing housing, such that the other end portion of the top foil overlaps the one end portion in the circumferential direction, and an inner side surface of the other end portion of the top foil is disposed at a position radially outside an extension line formed by an inner peripheral surface of the curved surface portion.
The first bending portion formed by bending the one end portion of the top foil outward in the radial direction may be fixed to the bearing housing, the top foil may be formed with a connecting portion connecting the first bending portion and the curved surface portion, the connecting portion may be formed as an extension line formed by gradually separating from the inner peripheral surface of the curved surface portion in the radial direction from the other side connected to the curved surface portion toward the one side connected to the first bending portion, and the other end portion of the top foil may be arranged so as to overlap with the connecting portion in the circumferential direction.
In addition, the top foil may be formed to extend more than 360 degrees in the circumferential direction with reference to the first bent portion, so that there is a region where the other side end portion and one side end portion of the top foil overlap in the circumferential direction.
The corrugated foil may be provided with no elastic wave portion in a range where the extending portion of the top foil and the other end portion are disposed in the circumferential direction.
In addition, the other end portion of the top foil may be formed with a second bending portion at least a part of which is bent outward in the radial direction.
In addition, the other side end portion of the top foil may be formed to be gradually thinner in thickness as going toward the tip in the circumferential direction.
In addition, the other side end portion of the top foil may be formed only to: the curved surface portion is disposed at a position before the peak of the first elastic wave portion in the circumferential direction extending from the one end portion.
The radially outer side of the other end portion of the top foil may be supported in contact with the connecting portion without an external force.
The other end portion of the top foil may be separated from the one end portion in a state where no external force is applied, and the other end portion may be bent outward in the radial direction by the pressure of air when the rotor rotates, so that the outer side of the other end portion is supported in contact with the one end portion.
According to another aspect, the foil air slide bearing of the invention may comprise: a bearing housing having a hollow portion in which the rotor is disposed; a wave foil provided inside the bearing housing and formed in a circumferential direction, the wave foil being formed with an elastic wave portion having a concave-convex shape and coupled to the bearing housing; a first top foil provided inside the wave foil and having a curved surface portion formed along a circumferential direction, wherein one end portion of the first top foil in the circumferential direction is fixed by being bonded to the bearing housing, and the other end portion of the first top foil is formed as a free end; and a second top foil interposed between the corrugated foil and the first top foil and formed in a circumferential direction, wherein one end portion of the second top foil in the circumferential direction is fixed to the bearing housing, and a free end, i.e., the other end portion, of the first top foil is formed to extend beyond the other end portion in a direction in which the curved surface portion extends with reference to the one end portion fixed to the bearing housing, such that the other end portion of the first top foil overlaps the one end portion in the circumferential direction, and an inner side surface of the other end portion of the first top foil is disposed at a position radially outside an extension line formed by an inner peripheral surface of the curved surface portion.
The first bending portion formed by bending the one end portion of the first top foil outward in the radial direction may be fixed to the bearing housing, the first top foil may be formed with a connecting portion connecting the first bending portion and the curved surface portion, the connecting portion may be formed as an extension line formed by gradually separating from the inner peripheral surface of the curved surface portion in the radial direction from the other side connected to the curved surface portion toward the one side connected to the first bending portion, and the other end portion of the first top foil may be arranged so as to overlap with the connecting portion in the circumferential direction.
Further, the first top foil may be formed to extend more than 360 degrees in the circumferential direction with reference to the first bending portion, so that there is a region where the other side end portion and one side end portion of the first top foil overlap in the circumferential direction.
The corrugated foil may be configured such that the elastic wave portion is not disposed in a range where the connecting portion and the other end portion of the first top foil are disposed in the circumferential direction.
In addition, the other end portion of the first top foil may be formed with a second bending portion at least a part of which is bent outward in the radial direction.
In addition, the other side end portion of the first top foil may be formed to be gradually thinner in thickness as going toward the tip in the circumferential direction.
In addition, the other side end portion of the first top foil may be formed only to: the curved surface portion is disposed at a position before the peak of the first elastic wave portion in the circumferential direction extending from the one end portion.
Further, the radially outer side of the other end portion of the first top foil may be supported in contact with the connecting portion in a state where no external force acts.
The other end portion of the first top foil may be separated from the one end portion in a state where no external force is applied, and the other end portion may be bent outward in the radial direction by the pressure of air when the rotor rotates, so that the outer side of the other end portion is supported in contact with the one end portion.
The invention has the following advantages: the top foil of the foil air slide bearing configured to support the radial load of the rotor and the rotor can be restrained from vibrating, and abnormal vibration of the rotor, which is a rotating body supported by the foil air slide bearing and is a radial load, can be prevented.
Drawings
Fig. 1 is a sectional view showing a conventional foil air slide bearing.
Fig. 2 to 4 are a perspective view, a sectional view, and a partially enlarged view, respectively, showing a foil air slide bearing according to a first embodiment of the present invention.
Fig. 5 and 6 are a cross-sectional view and a partial enlarged view, respectively, showing a foil air slide bearing according to a second embodiment of the present invention.
Fig. 7 to 9 are partial enlarged views showing a modified embodiment of the free end portion of the top foil in the foil air slide bearing according to the second embodiment of the invention.
Description of the reference numerals
100: a bearing housing; 110: a hollow portion; 120: a key slot; 200: wave foil; 210: an elastic wave unit; 300: a top foil; 301: a first top foil; 302: a second top foil; 310: a first bending part; 320: a connecting part; 330: a curved surface portion; 350: a second bending part; 400: a top foil key; 401: a first top foil key; 402: a second top foil key; 500: a rotor.
Detailed Description
The foil air slide bearing according to the present invention will be described in detail with reference to the drawings.
Example 1 ]
Fig. 2 to 4 are a perspective view, a sectional view, and a partially enlarged view, respectively, showing a foil air slide bearing according to a first embodiment of the present invention.
As shown in the figure, the foil air slide bearing according to the first embodiment of the present invention is generally composed of a bearing housing 100, a wave foil 200, and a top foil 300.
The bearing housing 100 is formed with a hollow portion 110 penetrating both surfaces so as to penetrate in the axial direction inside, and is formed with a key groove 120 recessed radially from the upper side of the inner peripheral surface so as to communicate with the hollow portion 110, and continuously formed along the axial direction, that is, the longitudinal direction.
The wave foil 200 is disposed inside the hollow portion 110 of the bearing housing 100, and the wave foil 200 is formed with a bent portion having one end in the circumferential direction bent outward in the radial direction, so that the bent portion can be inserted into and coupled to the key groove 120. The wave foil 200 may be disposed so as to be in close contact with the inner peripheral surface of the bearing housing 100 in the circumferential direction, and the wave foil 200 may be formed in a thin plate shape, and a plurality of elastic wave portions 210 protruding so as to bulge inward to be wound may be formed at intervals in the circumferential direction. In addition, as shown in the figure, the wave foil 200 may be formed in plurality and arranged at intervals along the circumferential direction. At this time, the corrugated foil 200 is formed with a bent portion having one end bent outward in the radial direction, and the bearing housing 100 is formed with a plurality of key grooves 120, so that the bent portions of the corrugated foil 200 can be inserted into the key grooves 120, respectively, to be fixed. That is, the foil wave 200 may be formed in a divided manner and arranged at intervals in the circumferential direction instead of being connected in a continuous manner in the circumferential direction. The foil 200 may be formed to extend counterclockwise from one end fixed to the bearing housing 100. In addition, the wave foil 200 may be formed in various forms.
The top foil 300 is provided on the inner side of the wave foil 200 and formed along the circumferential direction, and a first bending portion 310 is formed by bending one end portion in the circumferential direction to the outer side in the radial direction, and the first bending portion 310 can be inserted into the key groove 120 to fix the top foil 300. Here, the top foil key 400 is coupled to the first bending portion 310 of the top foil 300, and the first bending portion 310 of the top foil 300 and the top foil key 400 can be inserted into the key groove 120 of the bearing housing 100 to be fixed. In the top foil 300, the connecting portion 320 may be formed to extend in the clockwise direction from the lower end of the first bending portion 310, and the curved portion 330 may be formed to extend in the clockwise direction from the right end of the connecting portion 320. At this time, the connecting portion 320 may be formed so as to gradually separate from an extension line formed on the inner peripheral surface of the curved surface portion 330 in the radial direction toward the outside in the counterclockwise direction, and the curved surface portion 330 may be formed in an arc shape on the inner peripheral surface, for example. In addition, the other circumferential side end portion of the top foil 300 may be formed as a free end, so that the tip portion of the curved surface portion 330 may be formed as a free end. Accordingly, the top foil 300 is formed to extend in the clockwise direction beyond 360 degrees in the circumferential direction with reference to the first bending portion 310, and the other end portion of the top foil 300, which is a portion beyond 360 degrees, is arranged to overlap the first bending portion 310 and the connecting portion 320 in the circumferential direction. That is, the top foil 300 has a region where one end portion and the other end portion overlap each other in the circumferential direction, and the other end portion of the top foil 300 may be disposed inside the one end portion in the radial direction. In this case, the free end, i.e., the other end portion, of the top foil 300 may be disposed radially outward of the extension line formed by the inner peripheral surface of the curved surface portion 330. In addition, in a state where no external force acts, the radially outer side of the other end portion of the top foil 300 is supported in contact with the connecting portion 320, and as shown in the figure, only the free end portion of the top foil 300 may be in contact with the connecting portion 320, or a partial region of the free end portion may be supported in surface contact with the connecting portion 320. Alternatively, although not shown, the other end portion of the top foil 300 may be separated from the coupling portion 320 in a free state where no external force is applied, and in this case, the free end portion of the top foil 300 may be bent radially outward due to the pressure of air when the rotor 500 rotates, and the free end portion may be supported in contact with the coupling portion 320.
In addition, the rotor 500 may be inserted into the inside of the top foil 300 and disposed to be separated from the top foil 300, and a coating film may be formed on the inner circumferential surface of the top foil 300 using Teflon or the like to reduce friction caused by contact when the rotor 500 rotates. As a result, when the rotor 500 rotates at a high speed in the counterclockwise direction inside the top foil 300, the rotor 500 floats up due to the pressure of the flowing air and becomes separated from the top foil 300, so that the rotor 500 can smoothly rotate. That is, the rotation direction of the rotor 500 may be opposite to the direction in which the top foil 300 extends with reference to the first bending portion 310 that is fixed to the bearing housing 100.
Thus, the present invention minimizes the disturbance of the flow of air when the air flowing along with the high-speed rotation of the rotor passes near the free end of the top foil, thereby being capable of suppressing the vibration of the free end of the top foil and the rotor. That is, since a part of the free end side of the top foil is disposed so as to overlap the fixed end side and the free end portion is located at a position apart from the air flow direction, the disturbance of the air flow can be minimized and the dynamic stability of the rotor can be improved.
The corrugated foil 200 may be configured such that the elastic wave portion 210 is not disposed within a range in which the connecting portion 320 and the other end portion of the top foil 300 are disposed in the circumferential direction. Here, the other side end portion of the top foil may be in a range from the free end tip of the top foil 300 to the peak of the elastic wave portion 210 supported by the first elastic wave portion 210 in the counterclockwise direction. The connecting portion 320 may be formed in various manners, in addition to a range from the left end connected to the first bending portion 310 to the peak of the elastic wave portion 210 supported by the first elastic wave portion 210 in the clockwise direction. The free end of the top foil 300 may be disposed only at a position before the peak of the first elastic wave portion 210 disposed clockwise with reference to the first bending portion 310. That is, the free end of the top foil may be formed to be located longer than the place where the first bending portion 310 is located and shorter than the position where the peak of the elastic wave portion 210 is located in the circumferential direction.
Example 2 ]
Fig. 5 to 6 are a cross-sectional view and a partial enlarged view, respectively, showing a foil air slide bearing according to a second embodiment of the present invention.
As shown in the figure, the foil air slide bearing according to the second embodiment of the present invention is generally composed of a bearing housing 100, a wave foil 200, a first top foil 301, and a second top foil 302.
The bearing housing 100 and the wave foil 200 may be formed in the same manner as in the first embodiment described above.
The first top foil 301 is provided inside the wave foil 200 and formed along the circumferential direction, and a first bending portion 310 is formed by bending one end portion in the circumferential direction to the outside in the radial direction, so that the first bending portion 310 can be inserted into the key groove 120 to fix the top foil 300. Here, the first bending portion 310 of the first top foil 301 is coupled to the first top foil key 401, which is one key, and the first bending portion 310 of the first top foil 301 and the first top foil key 401 can be inserted into the key groove 120 of the bearing housing 100 to be fixed. The first top foil 301 may have a connecting portion 320 extending in a clockwise direction from a lower end of the first bending portion 310, and may have a curved portion 330 extending in a clockwise direction from a right end of the connecting portion 320. At this time, the coupling portion 320 may be formed so as to gradually approach an extension line formed on the inner circumferential surface of the curved surface portion 330 in the radial direction as going clockwise, and the curved surface portion 330 may be formed in a circular arc shape. In addition, the other side end portion in the circumferential direction of the first top foil 301 may be formed as a free end, so that the tip portion of the curved surface portion 330 may be formed as a free end. Accordingly, the first top foil 301 is formed to extend in the clockwise direction beyond 360 degrees in the circumferential direction with reference to the first bending portion 310, and the other end portion of the first top foil 301, which is a portion beyond 360 degrees, may be arranged to overlap the coupling portion 320 in the circumferential direction. That is, the first top foil 301 has a region where one end portion and the other end portion overlap each other, and the other end portion of the first top foil 301 may be disposed radially inward of the one end portion. In this case, the free end, i.e., the other end portion, of the first top foil 301 may be disposed radially outward of the extension line formed by the inner peripheral surface of the curved surface portion 330. In addition, in a state where no external force acts, the radially outer side of the other end portion of the first top foil 301 is supported in contact with the connecting portion 320, and as shown in the figure, only the free end portion of the first top foil 301 may be supported in contact with the connecting portion 320, or a partial region of the free end portion may be supported in contact with the connecting portion 320.
The second top foil 302 is sandwiched between the first top foil 301 and the corrugated foil 200, is formed along the circumferential direction, and has a bent portion formed by bending one end in the circumferential direction outward in the radial direction, and the second top foil key 402, which is another key, is bonded to the bent portion, and the second top foil key 402 can be inserted into the key groove 120 together with the bent portion to fix the second top foil 302. That is, the following structure can be formed: the second top foil 302 is disposed inside the wave foil 200, the outer peripheral surface of the second top foil 302 is in close contact with the wave crest of the elastic wave section 210, which is the inner side surface of the wave foil 200, the first top foil 301 is disposed inside the second top foil 302, and the outer peripheral surface of the first top foil 301 is in close contact with the inner peripheral surface of the second top foil 302. In addition, the second top foil 302 may be formed to extend in a counterclockwise direction from one end fixed to the bearing housing 100, so that the first top foil 301 and the second top foil 302 form a structure extending in opposite directions to each other. Here, the surface treatment layer is formed on the inner peripheral surface of the second top foil 302 by using a teflon coating film or the like, so that sliding is smoothly generated between the first top foil 301 and the second top foil 302, thereby reducing abrasion and vibration of the foils, and reducing abrasion of the inner peripheral surface of the first top foil and the coating film formed on the inner peripheral surface, which are rubbed by contact with the rotor. In addition, the second top foil 302 may be formed to have an angle ranging from 180 degrees to 360 degrees from one end to the other end. As an example, the free end may be formed to be in a range of more than 180 degrees and less than 270 degrees, based on one end of the second top foil 302, i.e., the bent portion, as shown in the figure.
In addition, the rotor 500 may be inserted into the inside of the first top foil 301 and configured to be separated from the first top foil 301, and a coating film may be formed on the inner circumferential surface of the first top foil 301 using teflon or the like to reduce friction caused by contact at the time of rotation of the rotor 500. As a result, when the rotor 500 rotates at a high speed in the counterclockwise direction inside the first top foil 301, the rotor 500 floats up due to the pressure of the flowing air, and becomes separated from the first top foil 301, so that the rotor 500 can smoothly rotate. The rotation direction of the rotor 500 may be opposite to the direction in which the first top foil 301 extends with reference to the first bending portion 310 that is fixed to the bearing housing 100.
Fig. 7 to 9 are partial enlarged views showing a modified embodiment of the free end portion of the top foil in the foil air slide bearing according to the second embodiment of the invention.
Referring to fig. 7, the portion where the coupling portion 320 meets the curved surface portion 330 is not a natural curved shape, but a bent shape, so that the length of the coupling portion 320 is formed relatively short. Thus, the inner peripheral surface of the curved surface portion 330 of the first top foil 301 can be formed to be substantially uniform at a portion where the inner peripheral surface meets the inner peripheral surface of the other end portion of the first top foil 301.
Referring to fig. 8, the other end portion of the first top foil 301 is formed with a second bent portion 350 at least a part of which is bent outward in the radial direction. The first top foil 301 is generally manufactured by winding a flat plate-like thin foil into a shape having a curved surface portion wound in a circular arc shape. Therefore, the free end portion of the first top foil may also have a circular arc shape similar to the curvature of the curved surface portion. Here, by forming the second bending portion 350 by bending the other end portion of the first top foil 301 radially outward, the free end of the first top foil can be reliably located radially outward of the extension line formed by the inner peripheral surface of the curved surface portion 330. Thereby, the free end portion of the top foil can be made not to interfere with the flow of air flowing with the rotation of the rotor. At this time, the end portion of the second bending portion 350 of the first top foil 301 may be supported in contact with the coupling portion 320.
Referring to fig. 9, the other side end portion of the first top foil 301 may be formed to be gradually thinner in thickness toward the tip in the circumferential direction. That is, the free end portion of the first top foil 301 is formed in a sharp shape in such a manner that its cross section becomes smaller as going clockwise, so that the free end portion of the first top foil can be made not to interfere with the flow of air flowing along with the rotation of the rotor. At this time, the free end portion of the first top foil 301 may be supported in surface contact with the joint 320.
The embodiment obtained by deforming the other end portion of the first top foil 301 as shown in fig. 7 to 9 can be applied to the first embodiment of the present invention, or can be applied after changing a part of the form.
The present invention is not limited to the above-described embodiments, and the scope of application thereof is of course diverse, and it is obvious that the present invention can be implemented by any person skilled in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the scope of claims.
Claims (12)
1. A foil air slide bearing is characterized in that,
comprising the following steps:
a bearing housing having a hollow portion in which the rotor is disposed;
a wave foil provided inside the bearing housing and formed in a circumferential direction, the wave foil being formed with an elastic wave portion having a concave-convex shape and coupled to the bearing housing; and
a top foil provided inside the wave foil and having a curved surface portion formed along a circumferential direction, wherein one end portion of the top foil in the circumferential direction is fixed by being coupled to the bearing housing, the other end portion of the top foil is formed as a free end,
the free end of the top foil is formed beyond the one end portion in a direction in which the curved surface portion is formed extending with reference to the one end portion fixed to the bearing housing, so that the free end of the top foil is arranged to overlap with the one end portion in a circumferential direction,
the inner side surface of the free end of the top foil is arranged at the outer side in the radial direction than an extension line formed by the inner peripheral surface of the curved surface part,
a first bending portion formed by bending the one side end portion of the top foil outward in the radial direction is fixed to the bearing housing, the top foil is formed with a connecting portion connecting the first bending portion and the curved surface portion, the connecting portion is formed as an extension line formed by gradually separating from the inner peripheral surface of the curved surface portion in the radial direction from the other side connected with the curved surface portion toward the one side connected with the first bending portion,
the free end of the top foil is arranged to overlap the joint in the circumferential direction,
the radially outer side of the free end of the top foil is supported in contact with the connecting portion in a state where no external force acts.
2. The foil air slide bearing as recited in claim 1, wherein,
the top foil is formed to extend more than 360 degrees in the circumferential direction with reference to the first bending portion, so that there is a region where the other side end portion of the top foil overlaps the one side end portion in the circumferential direction.
3. The foil air slide bearing as recited in claim 2, wherein,
the wave foil is not provided with an elastic wave part in a range where a connecting part of the top foil and the other side end part are arranged along the circumferential direction.
4. The foil air slide bearing as recited in claim 1, wherein,
the other side end of the top foil is formed with a second bending part at least a part of which is bent outward in the radial direction.
5. The foil air slide bearing as recited in claim 1, wherein,
the other side end portion of the top foil is formed to be gradually thinner in thickness as going toward the tip in the circumferential direction.
6. The foil air slide bearing as recited in claim 1, wherein,
the other side end portion of the top foil is formed only to: the curved surface portion is disposed at a position before the peak of the first elastic wave portion in the circumferential direction extending with the one end portion as a reference.
7. A foil air slide bearing is characterized in that,
comprising the following steps:
a bearing housing having a hollow portion in which the rotor is disposed;
a wave foil provided inside the bearing housing and formed in a circumferential direction, the wave foil being formed with an elastic wave portion having a concave-convex shape and coupled to the bearing housing;
a first top foil provided inside the wave foil and having a curved surface portion formed along a circumferential direction, one end portion of the first top foil in the circumferential direction being fixed by being bonded to the bearing housing, and the other end portion of the first top foil being formed as a free end; and
a second top foil interposed between the corrugated foil and the first top foil and formed along a circumferential direction, one end portion of the second top foil in the circumferential direction being bonded to the bearing housing and fixed,
the free end of the first top foil is formed beyond the one side end portion in a direction in which the curved surface portion is formed extending with reference to the one side end portion of the first top foil fixed to the bearing housing, so that the free end portion of the first top foil is arranged to overlap the one side end portion of the first top foil in a circumferential direction,
the inner side surface of the free end of the first top foil is disposed at a position further toward the outer side in the radial direction than an extension line formed by the inner peripheral surface of the curved surface portion,
a first bending portion formed by bending the one-side end portion of the first top foil radially outward is fixed to the bearing housing, the first top foil is formed with a connecting portion connecting the first bending portion and the curved surface portion, the connecting portion is formed as an extension line formed gradually apart from an inner peripheral surface of the curved surface portion radially from the other side connected with the curved surface portion toward the one side connected with the first bending portion,
the free end of the first top foil is arranged to overlap the joint portion in the circumferential direction,
the radially outer side of the free end of the first top foil is supported in contact with the connecting portion in a state where no external force acts.
8. The foil air slide bearing as recited in claim 7, wherein,
the first top foil is formed to extend more than 360 degrees in the circumferential direction with reference to the first bent portion, so that there is a region where the other side end portion of the first top foil overlaps the one side end portion of the first top foil in the circumferential direction.
9. The foil air slide bearing as recited in claim 8, wherein,
the corrugated foil is not provided with an elastic wave portion in a range where the connecting portion of the first top foil and the other side end portion are arranged in the circumferential direction.
10. The foil air slide bearing as recited in claim 7, wherein,
the other side end of the first top foil is formed with a second bending part at least a part of which is bent outward in the radial direction.
11. The foil air slide bearing as recited in claim 7, wherein,
the other side end portion of the first top foil is formed to be gradually thinner in thickness as going toward the tip in the circumferential direction.
12. The foil air slide bearing as recited in claim 7, wherein,
the other side end portion of the first top foil is formed only to: the curved surface portion is disposed at a position before the peak of the first elastic wave portion in the circumferential direction, the position being formed by extending the curved surface portion with the one end portion as a reference.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020200054895A KR102166622B1 (en) | 2020-05-08 | 2020-05-08 | Air foil journal bearing |
| KR10-2020-0054895 | 2020-05-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113623320A CN113623320A (en) | 2021-11-09 |
| CN113623320B true CN113623320B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110498950.1A Active CN113623320B (en) | 2020-05-08 | 2021-05-08 | Foil air slide bearing |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102166622B1 (en) |
| CN (1) | CN113623320B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220118661A (en) * | 2021-02-19 | 2022-08-26 | 한온시스템 주식회사 | Air foil journal bearing |
Citations (8)
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|---|---|---|---|---|
| US4699523A (en) * | 1983-09-01 | 1987-10-13 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Aerodynamic radial bearing |
| CN102003463A (en) * | 2009-08-31 | 2011-04-06 | 扭力士有限公司 | Journal-foil air bearing |
| JP2012177457A (en) * | 2011-02-28 | 2012-09-13 | Ntn Corp | Foil bearing |
| CN103703261A (en) * | 2011-08-01 | 2014-04-02 | 株式会社Ihi | Radial foil bearing |
| CN104204566A (en) * | 2012-04-06 | 2014-12-10 | 株式会社Ihi | Radial foil bearing |
| JP2017020605A (en) * | 2015-07-14 | 2017-01-26 | 株式会社Ihi | Radial foil bearing and turbomachine |
| CN109812493A (en) * | 2017-11-21 | 2019-05-28 | 翰昂汽车零部件有限公司 | Air paillon transverse bearing |
| CN110431320A (en) * | 2017-03-15 | 2019-11-08 | 株式会社Ihi | Radial bearing foil |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4287021B2 (en) * | 2000-04-10 | 2009-07-01 | 本田技研工業株式会社 | Foil type hydrodynamic bearing |
| JP4502548B2 (en) * | 2001-06-12 | 2010-07-14 | 本田技研工業株式会社 | Foil type hydrodynamic bearing |
| JP2011169413A (en) | 2010-02-19 | 2011-09-01 | Honda Motor Co Ltd | Dynamic pressure gas journal bearing |
-
2020
- 2020-05-08 KR KR1020200054895A patent/KR102166622B1/en active IP Right Grant
-
2021
- 2021-05-08 CN CN202110498950.1A patent/CN113623320B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4699523A (en) * | 1983-09-01 | 1987-10-13 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Aerodynamic radial bearing |
| CN102003463A (en) * | 2009-08-31 | 2011-04-06 | 扭力士有限公司 | Journal-foil air bearing |
| JP2012177457A (en) * | 2011-02-28 | 2012-09-13 | Ntn Corp | Foil bearing |
| CN103703261A (en) * | 2011-08-01 | 2014-04-02 | 株式会社Ihi | Radial foil bearing |
| CN104204566A (en) * | 2012-04-06 | 2014-12-10 | 株式会社Ihi | Radial foil bearing |
| JP2017020605A (en) * | 2015-07-14 | 2017-01-26 | 株式会社Ihi | Radial foil bearing and turbomachine |
| CN110431320A (en) * | 2017-03-15 | 2019-11-08 | 株式会社Ihi | Radial bearing foil |
| CN109812493A (en) * | 2017-11-21 | 2019-05-28 | 翰昂汽车零部件有限公司 | Air paillon transverse bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113623320A (en) | 2021-11-09 |
| KR102166622B1 (en) | 2020-10-16 |
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