CN113623320A - Foil air sliding bearing - Google Patents
Foil air sliding bearing Download PDFInfo
- Publication number
- CN113623320A CN113623320A CN202110498950.1A CN202110498950A CN113623320A CN 113623320 A CN113623320 A CN 113623320A CN 202110498950 A CN202110498950 A CN 202110498950A CN 113623320 A CN113623320 A CN 113623320A
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- Prior art keywords
- foil
- top foil
- end portion
- circumferential direction
- bearing housing
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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
- 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
- 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
- F16C32/0662—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 sliding bearing comprising a bearing housing, a bump foil provided inside the bearing housing, and a top foil provided inside the bump foil, the free end of the top foil, that is, the other end portion is formed to exceed the other end portion in the direction in which the curved surface portion extends with reference to the one end portion fixed to the bearing housing, the other end of the top foil is arranged to overlap the one end in the circumferential direction, the inner surface of the other end of the top foil is arranged at a position radially outward of an extension line formed on the inner circumferential surface of the curved portion, this prevents the flow of air flowing along with the rotor from becoming unstable at the free end of the top foil when the rotor disposed inside the top foil rotates at a high speed, thereby suppressing the top foil from vibrating and preventing abnormal vibration of the rotor.
Description
Technical Field
The present invention relates to a foil Air sliding bearing (Air foil journal bearing) configured to support a load in a radial direction of a rotor, and is capable of suppressing abnormal vibration of the rotor rotating at a high speed and ensuring dynamic stability.
Background
Foil air bearings refer to: as the rotor (or the rotary shaft) rotates at a high speed, air as a fluid with viscosity flows between foils in contact with the rotor or a bearing disk (bearing disk) to form pressure, thereby supporting a load.
In the foil air bearing, the foil air sliding 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 sliding bearing is configured such that a Bump Foil (Bump Foil)2 is provided along an inner circumferential surface 1b of a hollow portion 1a of a bearing housing 1, a Top Foil (Top Foil)3 is disposed inside the Bump Foil 2, and a rotor 4 (or a rotating shaft) is disposed inside the Top Foil 3, so that the rotor can rotate in a state where the inner circumferential surface of the Top Foil 3 is spaced from the outer circumferential surface of the rotor 4. The bump foil 2 and the top foil 3 are formed with bent portions in which one end portion in the circumferential direction is bent outward in the radial direction, and the bent portions 2a and 3a are inserted into and fixed to a concave groove 1c formed in the bearing housing 1. Accordingly, when the rotor is stationary and the rotor is supported by its own weight in contact with the lower side of the inner peripheral surface of the top foil, the rotor floats from the lower side of the inner peripheral surface of the top foil and rotates as the pressure of air between the lower side of the rotor and the top foil increases when the rotor is rotated and started.
In an industrial machine using such a foil air sliding bearing, the rigidity of the lower portion of the foil air sliding bearing, which is a portion on which a load of a rotor acts, is very important, but the importance of the rigidity of the upper portion of the foil air sliding bearing is also increasing in order to cope with various elements required in an automobile.
However, in a typical foil air sliding bearing, one end of the top foil is fixed to the upper side of the bearing housing, and the other end is formed as a free end and is separated from the rigid support portion of the bump foil. That is, the other end of the top foil is not supported or fixed to the bump foil and the bearing housing, but is kept suspended in the hollow space.
Accordingly, when 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, not only the rotor as a rotating body but also the top foil vibrates, which causes a problem of causing abnormal vibration of the rotor.
Documents of the prior art
Patent document 1: JP 2011-16943A (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 sliding bearing capable of suppressing the occurrence of vibration of a top foil and a rotor by minimizing disturbance of air flowing along with rotation of the rotor at a free end of the top foil of the foil air sliding bearing configured to support a load in a radial direction of the rotor.
To achieve the above object, the foil air sliding bearing of the present invention may include: a bearing housing in which a hollow portion in which the rotor is disposed is formed; a bump foil that is provided inside the bearing housing and formed along a circumferential direction, the bump foil being formed with an elastic wave portion having a concave-convex shape and being coupled to the bearing housing; and a top foil provided inside the bump foil and having a curved surface portion formed along a circumferential direction, wherein one circumferential end portion of the top foil is coupled to and fixed to the bearing housing, the other circumferential end portion of the top foil is formed as a free end, the other free end portion of the top foil is formed so as 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, the other circumferential end portion of the top foil is arranged so as to overlap the one end portion, and an inner side surface of the other end portion of the top foil is arranged radially outward of an extension line formed on an inner circumferential surface of the curved surface portion.
Further, a first bent portion formed by bending 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 bent portion and the curved portion, the connecting portion may be formed as an extension line formed by an inner peripheral surface of the curved portion gradually separating in the radial direction from the other side connected to the curved portion toward the side connected to the first bent portion, and the other end portion of the top foil may be arranged to overlap the connecting portion in the circumferential direction.
In addition, the top foil may be formed to extend in the circumferential direction by more than 360 degrees with reference to the first bent portion, so that there is a region where the other end portion and one end portion of the top foil overlap in the circumferential direction.
The bump foil may not be provided with the elastic wave portion in a range where the extending portion and the other end portion of the top foil are arranged in the circumferential direction.
The other end of the top foil may be formed with a second bent 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 have a thickness gradually thinner toward the tip end in the circumferential direction.
In addition, the other side end of the top foil may be formed only up to: the curved surface portion is arranged at a position before the crest of the elastic wave portion in the first order in the circumferential direction in which the curved surface portion extends with the one end portion as a reference.
The radially outer side of the other end of the top foil may be supported by being in contact with the connecting portion without an external force.
The other end of the top foil may be spaced apart from the one end in a state where no external force is applied, and the other end may be bent outward in the radial direction by a pressure of air when the rotor rotates, so that an outer side of the other end is supported by being in contact with the one end.
According to another aspect, the foil air sliding bearing of the present invention may comprise: a bearing housing in which a hollow portion in which the rotor is disposed is formed; a bump foil that is provided inside the bearing housing and formed along a circumferential direction, the bump foil being formed with an elastic wave portion having a concave-convex shape and being coupled to the bearing housing; a first top foil provided inside the bump foil and having a curved surface portion formed along a circumferential direction, one circumferential end portion of the first top foil being coupled and fixed to the bearing housing, and the other circumferential end portion of the first top foil being a free end; and a second top foil interposed between the bump foil and the first top foil and formed along a circumferential direction, wherein one circumferential end of the second top foil is coupled and fixed to the bearing housing, the other free end of the first top foil is formed to be positioned beyond the other end of the first top foil in a direction in which the curved surface portion extends with respect to the one end fixed to the bearing housing, so that the other end of the first top foil is arranged to overlap the one end in the circumferential direction, and an inner surface of the other end of the first top foil is arranged radially outward of an extension line formed on an inner circumferential surface of the curved surface portion.
Further, a first bent portion formed by bending 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 bent portion and the curved portion, the connecting portion may be formed as an extended line formed by an inner peripheral surface of the curved portion gradually separating in the radial direction from the other side connected to the curved portion toward the side connected to the first bent portion, and the other end portion of the first top foil may be arranged to overlap the connecting portion in the circumferential direction.
In addition, the first top foil may be formed to extend in the circumferential direction by more than 360 degrees with reference to the first bent portion, so that there is a region where the other end portion and one end portion of the first top foil overlap in the circumferential direction.
The bump foil may be provided with no elastic wave portion in a range where the connection portion and the other end portion of the first top foil are arranged in the circumferential direction.
Further, the other end of the first top foil may be formed with a second bent 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 have a thickness gradually thinner toward the tip end in the circumferential direction.
In addition, the other side end portion of the first top foil may be formed only up to: the curved surface portion is arranged at a position before the crest of the elastic wave portion in the first order in the circumferential direction in which the curved surface portion extends with the one end portion as a reference.
The radially outer side of the other end of the first top foil may be supported by contacting the connection portion without an external force.
The other end of the first top foil may be spaced apart from the one end in a state where no external force is applied, and the other end may be bent outward in the radial direction by a pressure of air when the rotor rotates, so that an outer side of the other end is supported by being in contact with the one end.
The invention has the following advantages: the vibration of the top foil of the foil air sliding bearing configured to support the load in the radial direction of the rotor and the rotor can be suppressed, and the abnormal vibration of the rotor, which is a rotating body supported by the foil air sliding bearing to support the load in the radial direction, can be prevented.
Drawings
Fig. 1 is a sectional view showing a conventional foil air sliding bearing.
Fig. 2 to 4 are a perspective view, a sectional view, and a partially enlarged view showing a foil air sliding bearing according to a first embodiment of the present invention.
Fig. 5 and 6 are a sectional view and a partially enlarged view showing a foil air sliding bearing according to a second embodiment of the present invention.
Fig. 7 to 9 are partially enlarged views showing modified examples of the free end portion of the top foil in the foil air sliding bearing according to the second embodiment of the present invention.
Description of the reference numerals
100: a bearing housing; 110: a hollow part; 120: a keyway; 200: a bump foil; 210: an elastic wave section; 300: a top foil; 301: a first top foil; 302: a second top foil; 310: a first bent portion; 320: a connecting portion; 330: a curved surface portion; 350: a second bent portion; 400: a top foil key; 401: a first top foil key; 402: a second top foil key; 500: and a rotor.
Detailed Description
The foil air sliding bearing of 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 showing a foil air sliding bearing according to a first embodiment of the present invention.
As shown in the drawings, the foil air sliding bearing according to the first embodiment of the present invention is mainly composed of a bearing housing 100, a bump foil 200, and a top foil 300.
The bearing housing 100 has a hollow portion 110 formed therein so as to penetrate both surfaces thereof in the axial direction, and a key groove 120 formed therein continuously in the longitudinal direction, which is the axial direction, while being recessed in the radial direction from the upper side of the inner peripheral surface so as to communicate with the hollow portion 110.
The bump foil 200 is disposed inside the hollow portion 110 of the bearing housing 100, and the bump foil 200 is formed with a bent portion formed by bending one end in the circumferential direction radially outward, so that the bent portion can be inserted into and coupled to the key groove 120. The bump foil 200 may be disposed along the circumferential direction so as to be in close contact with the inner circumferential surface of the bearing housing 100, and the bump foil 200 may be formed in a thin plate shape, and a plurality of elastic wave portions 210 protruding so as to bulge inward may be formed at intervals along the circumferential direction. As shown, the bump foil 200 may be formed in plural and arranged at intervals in the circumferential direction. At this time, the corrugated foils 200 are each formed with a bent portion having one end bent radially outward, and the bearing housing 100 is formed with a plurality of key grooves 120, so that the bent portions of the corrugated foils 200 can be inserted into and fixed to the key grooves 120. That is, the bump foils 200 may be formed in a divided form and arranged at intervals in the circumferential direction, instead of being connected continuously in a single piece in the circumferential direction. The bump foil 200 may be formed to extend counterclockwise from one end fixed to the bearing housing 100. In addition, the bump foil 200 may be formed in various forms.
The top foil 300 is provided inside the bump foil 200 and formed along the circumferential direction, and a first bent portion 310 is formed by bending one circumferential end portion outward in the radial direction, and the first bent 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 bent portion 310 of the top foil 300, so that the first bent portion 310 and the top foil key 400 of the top foil 300 can be inserted into and fixed to the key groove 120 of the bearing housing 100. The top foil 300 may have a coupling portion 320 formed to extend clockwise from the lower end of the first bent portion 310, and a curved portion 330 formed to extend clockwise from the right end of the coupling portion 320. In this case, the coupling portion 320 may be formed to be gradually separated from an extension line formed on the inner circumferential surface of the curved portion 330 toward the outside in the radial direction as it goes counterclockwise, and the curved portion 330 may be formed to have an arc-shaped inner circumferential surface, for example. In addition, the circumferential direction other side end portion of the top foil 300 may be formed as a free end, so that the end 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 by more than 360 degrees in the circumferential direction based on the first bent portion 310, and the other end portion of the top foil 300, which is a portion exceeding 360 degrees, is arranged to overlap the first bent portion 310 and the coupling 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 arranged on the back side of the one end portion in the radial direction. In this case, the other end of the top foil 300 may be disposed radially outward of an extension line formed on the inner circumferential surface of the curved surface portion 330. In addition, the radially outer side of the other end portion of the top foil 300 is supported in contact with the coupling portion 320 in a state where no external force is applied, and as shown in the drawing, only the free end portion of the top foil 300 may be supported in contact with the coupling portion 320, or a partial region of the free end portion may be supported in surface contact with the coupling portion 320. Alternatively, although not shown, the other end of the top foil 300 may be disposed in a free state without external force applied and separated from the connection portion 320, and at this time, the free end of the top foil 300 is bent outward in the radial direction by the pressure of air when the rotor 500 rotates, and the free end tip is supported in a state of being in contact with the connection portion 320.
In addition, the rotor 500 may be inserted into the inside of the top foil 300 and disposed apart from the top foil 300, and a coating film may be formed on the inner circumferential surface of the top foil 300 using Teflon (Teflon) or the like to reduce friction caused by contact when the rotor 500 rotates. Accordingly, when the rotor 500 rotates at a high speed in the counterclockwise direction inside the top foil 300, the rotor 500 floats up by the pressure of the flowing air to be separated from the top foil 300, and 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 based on the first bent portion 310 that is coupled to and fixed to the bearing housing 100.
Accordingly, the present invention minimizes disturbance of the air flow when the air flowing along with the high-speed rotation of the rotor passes near the free end of the top foil, thereby 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 arranged to overlap the fixed end side and the free end portion is positioned away from the air flow direction, the air flow disturbance can be minimized and the dynamic stability of the rotor can be improved.
In the bump foil 200, the elastic wave portion 210 may not be disposed in a range where the connection portion 320 and the other end portion of the top foil 300 are disposed in the circumferential direction. Here, the other end of the top foil may be in a range from the free end 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. Coupling portion 320 may be formed in various ways, as well as ranging from the left end coupled to first bent portion 310 to the peak of elastic wave portion 210 supported by first elastic wave portion 210 in the clockwise direction. The free end of the top foil 300 may be disposed only up to a position before the peak of the first elastic wave portion 210 disposed in the clockwise direction with respect to the first bent portion 310. That is, the free end of the top foil may be formed to be longer than the point where the first bent portion 310 is located and shorter than the point where the peak of the elastic wave portion 210 is located in the circumferential direction.
< example 2>
Fig. 5 to 6 are a sectional view and a partially enlarged view showing a foil air sliding bearing according to a second embodiment of the present invention, respectively.
As shown in the drawings, the foil air sliding bearing according to the second embodiment of the present invention is mainly composed of a bearing housing 100, a bump foil 200, a first top foil 301, and a second top foil 302.
The bearing housing 100 and the bump foil 200 may be formed in the same manner as in the first embodiment.
The first top foil 301 is provided inside the bump foil 200 and formed along the circumferential direction, and is formed with a first bent portion 310 formed by bending one circumferential end portion radially outward, so that the top foil 300 can be fixed by inserting the first bent portion 310 into the key groove 120. Here, a first top foil key 401, which is one key, is coupled to the first bent portion 310 of the first top foil 301, and the first bent portion 310 and the first top foil key 401 of the first top foil 301 may be inserted into the key groove 120 of the bearing housing 100 and fixed. The first top foil 301 may have a coupling portion 320 formed to extend clockwise from the lower end of the first folded portion 310, and may have a curved portion 330 formed to extend clockwise from the right end of the coupling portion 320. In this case, the coupling portion 320 may be formed to be gradually closer to an extension line formed on the inner circumferential surface of the curved surface portion 330 in the radial direction as the coupling portion moves clockwise, and the curved surface portion 330 may be formed in an arc shape. In addition, the other circumferential-direction side end portion of the first top foil 301 may be formed as a free end, so that the end 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 by more than 360 degrees in the circumferential direction based on the first bent portion 310, and the other end portion of the first top foil 301, which is a portion exceeding 360 degrees, may be disposed 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 other end of the first top foil 301 may be disposed radially outward of an extension line formed on the inner circumferential surface of the curved surface portion 330. In addition, the radially outer side of the other end portion of the first top foil 301 is supported in contact with the coupling portion 320 in a state where no external force is applied, and as shown in the drawing, only the free end portion of the first top foil 301 may be supported in contact with the coupling portion 320, or a partial region of the free end portion may be supported in contact with the coupling portion 320.
The second top foil 302 is interposed between the first top foil 301 and the bump foil 200, and is formed with a bent portion formed by bending one end in the circumferential direction radially outward, and the second top foil key 402, which is another key, is coupled 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 may 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 inner surface of the wave foil 200, that is, the peak of the elastic wave section 210, 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 are formed to extend in opposite directions to each other. Here, a surface-treated layer is formed on the inner circumferential surface of the second top foil 302 by 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 foil pieces, and reducing abrasion of the inner circumferential surface of the first top foil which is brought into contact with the rotor and is rubbed and the coating film formed on the inner circumferential surface. In addition, the second top foil 302 may be formed to have a forming angle ranging from 180 degrees to 360 degrees from one end to the other end. For example, as shown in the drawing, the free end may be formed to be located in a range of more than 180 degrees and less than 270 degrees with respect to the bent portion, which is one end of the second top foil 302.
In addition, the rotor 500 may be inserted into the inside of the first top foil 301 and disposed to be separated from the first top foil 301, and a coating film may be formed using teflon or the like on the inner circumferential surface of the first top foil 301 to reduce friction caused by contact when the rotor 500 rotates. Accordingly, when the rotor 500 rotates at a high speed in the counterclockwise direction inside the first top foil 301, the rotor 500 floats up by the pressure of the flowing air and is separated from the first top foil 301, and 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 based on the first bent portion 310 that is coupled to and fixed to the bearing housing 100.
Fig. 7 to 9 are partially enlarged views showing modified examples of the free end portion of the top foil in the foil air sliding bearing according to the second embodiment of the present invention.
Referring to fig. 7, the portion where the coupling portion 320 and the curved surface portion 330 meet is not in a natural curved shape but in a bent shape, and the length of the coupling portion 320 is formed to be relatively short. Thus, the inner peripheral surface of the curved surface portion 330 of the first top foil 301 and the inner peripheral surface of the other end portion of the first top foil 301 can be formed to be almost uniform.
Referring to fig. 8, the other end of the first top foil 301 is formed with a second bent portion 350 at least a portion of which is bent radially outward. The first top foil 301 is generally formed by winding a flat plate-like thin foil to form a shape in which a curved surface portion is wound in an arc shape. Therefore, the free end portion of the first top foil may also be in the shape of a circular arc similar to the curvature of the curved surface portion. Here, by forming the second bent 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 positioned radially outward of the extended line formed by the inner peripheral surface of the curved surface portion 330. Thereby, it is possible to make the free end portion of the top foil not interfere with the flow of air flowing with the rotation of the rotor. At this time, the end portion of the second bent 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 end in the circumferential direction. That is, the free end portion of the first top foil 301 is formed in a sharp shape so that the cross section thereof becomes smaller in the clockwise direction, so that the free end portion of the first top foil can be prevented from interfering with the flow of the 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 coupling portion 320.
Further, the embodiment in which the other end portion of the first top foil 301 is modified as shown in fig. 7 to 9 can be applied to the first embodiment of the present invention, and some of the embodiments may be modified and applied.
It is obvious to those skilled in the art to which the present invention pertains that the present invention can be variously applied without departing from the gist of the present invention claimed in the scope of claims, and that the present invention can be variously modified and implemented.
Claims (18)
1. A foil air slide bearing, characterized in that,
the method comprises the following steps:
a bearing housing in which a hollow portion in which the rotor is disposed is formed;
a bump foil that is provided inside the bearing housing and formed along a circumferential direction, the bump foil being formed with an elastic wave portion having a concave-convex shape and being coupled to the bearing housing; and
a top foil provided inside the bump foil and having a curved surface portion formed along a circumferential direction, one circumferential end portion of the top foil being coupled and fixed to the bearing housing, and the other circumferential end portion of the top foil being formed as a free end,
the other end of the top foil is formed to extend beyond the other end in a direction in which the curved surface portion extends with respect to the one end fixed to the bearing housing, so that the other end of the top foil is arranged to overlap the one end in a circumferential direction,
the inner surface of the other end of the top foil is disposed radially outward of an extension line formed on the inner circumferential surface of the curved portion.
2. Foil air slide bearing according to claim 1,
a first bent portion formed by bending one end portion of the top foil outward in a radial direction is fixed to the bearing housing, the top foil is formed with a coupling portion coupling the first bent portion and the curved portion, the coupling portion is formed as an extension line formed by an inner peripheral surface of the curved portion gradually separating in the radial direction from the other side coupled to the curved portion toward the side coupled to the first bent portion,
the other end of the top foil is arranged to overlap the connection portion in the circumferential direction.
3. Foil air slide bearing according to claim 2,
the top foil is formed to extend over 360 degrees in the circumferential direction with reference to the first bent portion, and there is a region where the other end portion and one end portion of the top foil overlap in the circumferential direction.
4. Foil air slide bearing according to claim 3,
the bump foil is not provided with an elastic wave portion in a range where the extending portion and the other end portion of the top foil are arranged in the circumferential direction.
5. Foil air slide bearing according to claim 1,
and a second bent part formed by bending at least one part of the top foil towards the outer side of the radius direction is formed at the other end part of the top foil.
6. Foil air slide bearing according to claim 1,
the other side end portion of the top foil is formed to have a thickness gradually thinner toward the tip end in the circumferential direction.
7. Foil air slide bearing according to claim 1,
the other side end of the top foil is formed only up to: the curved surface portion is arranged at a position before the crest of the elastic wave portion in the first order in the circumferential direction in which the curved surface portion extends with the one end portion as a reference.
8. Foil air slide bearing according to claim 2,
the radially outer side of the other end of the top foil is supported in contact with the connecting portion without an external force.
9. Foil air slide bearing according to claim 2,
the other side end portion of the top foil is arranged to be separated from the one side end portion in a state where no external force is applied,
when the rotor rotates, the other end portion is bent outward in the radial direction by the pressure of air, and the outside of the other end portion is supported in contact with the one end portion.
10. A foil air slide bearing, characterized in that,
the method comprises the following steps:
a bearing housing in which a hollow portion in which the rotor is disposed is formed;
a bump foil that is provided inside the bearing housing and formed along a circumferential direction, the bump foil being formed with an elastic wave portion having a concave-convex shape and being coupled to the bearing housing;
a first top foil provided inside the bump foil and having a curved surface portion formed along a circumferential direction, one circumferential end portion of the first top foil being coupled and fixed to the bearing housing, and the other circumferential end portion of the first top foil being a free end; and
a second top foil interposed between the bump foil and the first top foil and formed along a circumferential direction, one circumferential end portion of the second top foil being bonded and fixed to the bearing housing,
the other end of the first top foil is formed to extend beyond the other end in a direction in which the curved surface portion extends with respect to the one end fixed to the bearing housing, so that the other end of the first top foil is arranged to overlap the one end in a circumferential direction,
the inner surface of the other end of the first top foil is disposed radially outward of an extension line formed on the inner circumferential surface of the curved portion.
11. Foil air slide bearing according to claim 10,
a first bent portion formed by bending one end portion of the first top foil outward in a radial direction is fixed to the bearing housing, the first top foil is formed with a connection portion connecting the first bent portion and the curved portion, the connection portion is formed as an extension line formed by an inner peripheral surface of the curved portion gradually separating in the radial direction from the other side connected to the curved portion toward the side connected to the first bent portion,
the other end of the first top foil is arranged to overlap the connection portion in the circumferential direction.
12. Foil air slide bearing according to claim 11,
the first top foil is formed to extend over 360 degrees in the circumferential direction with reference to the first bent portion, and thus has a region where the other end portion and one end portion of the first top foil overlap in the circumferential direction.
13. Foil air slide bearing according to claim 12,
the corrugated foil is not provided with an elastic wave part in a range where the connection part and the other end part of the first top foil are arranged along the circumferential direction.
14. Foil air slide bearing according to claim 10,
and a second bent part formed by bending at least one part of the other end part of the first top foil towards the outer side of the radius direction is formed at the other end part of the first top foil.
15. Foil air slide bearing according to claim 10,
the other side end portion of the first top foil is formed to have a thickness gradually thinner toward the tip end in the circumferential direction.
16. Foil air slide bearing according to claim 10,
the other side end of the first top foil is formed only to: the curved surface portion is arranged at a position before the crest of the elastic wave portion in the first order in the circumferential direction in which the curved surface portion extends with the one end portion as a reference.
17. Foil air slide bearing according to claim 11,
the other end of the first top foil is supported by contacting the connection portion at the radially outer side thereof in a state where no external force is applied.
18. Foil air slide bearing according to claim 11,
the other side end portion of the first top foil is arranged to be separated from the one side end portion in a state where no external force is applied,
when the rotor rotates, the other end portion is bent outward in the radial direction by the pressure of air, and the outside of the other end portion is supported in contact with the one end portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2020-0054895 | 2020-05-08 | ||
| KR1020200054895A KR102166622B1 (en) | 2020-05-08 | 2020-05-08 | Air foil journal bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113623320A true CN113623320A (en) | 2021-11-09 |
| CN113623320B CN113623320B (en) | 2023-10-13 |
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Family Applications (1)
| 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 |
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|---|---|---|---|---|
| US4699523A (en) * | 1983-09-01 | 1987-10-13 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Aerodynamic radial bearing |
| US20010028752A1 (en) * | 2000-04-10 | 2001-10-11 | Honda Giken Kogyo Kabushiki Kaisha | Fluid bearing having a foil assembly |
| US20030012466A1 (en) * | 2001-06-12 | 2003-01-16 | Noria Shimizu | Foil type fluid 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (10)
| 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 |
| US20010028752A1 (en) * | 2000-04-10 | 2001-10-11 | Honda Giken Kogyo Kabushiki Kaisha | Fluid bearing having a foil assembly |
| US20030012466A1 (en) * | 2001-06-12 | 2003-01-16 | Noria Shimizu | Foil type fluid 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 |
|---|---|
| CN113623320B (en) | 2023-10-13 |
| KR102166622B1 (en) | 2020-10-16 |
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