An elastic foil gas bearing and a transmission device with adjustable support stiffness

Abstract

The present invention discloses an elastic foil gas bearing with adjustable support stiffness and a transmission device. The bearing is used to be sleeved on a matching journal, and includes an elastic foil gas bearing body, a rotating bearing sleeve, a fixed bearing sleeve and a driving device; the elastic foil gas bearing body includes a bottom arch foil and a top foil. The top foil is arc-shaped and is sleeved on the journal. The bottom arch foil is correspondingly supported outside the top foil; the bottom arch foil is externally sleeved with a rotating bearing sleeve and a fixed bearing sleeve arranged axially. The bottom arch foil is fixedly connected to the rotating bearing sleeve and the fixed bearing sleeve respectively. The connection points of the bottom arch foil with the rotating bearing sleeve and the connection points of the bottom arch foil with the fixed bearing sleeve are axially staggered; the driving device drives the rotating bearing sleeve to rotate, so as to compress or stretch the waveform arch of the bottom arch foil. The present invention can improve the stability of the bearing rotor system by changing the stiffness of the elastic gas foil bearing in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission. More specifically, the present invention relates to an elastic foil gas bearing with adjustable support stiffness. Background Art

[0002] The elastic foil gas bearing has good self - adaptability and can operate for a long time under high - temperature, high - speed and high - pollution conditions without additional oil - supply auxiliary devices, so the structure is simple. However, due to its low specific load - carrying capacity and narrow stability region, the elastic foil gas bearing is prone to instability when operating at high speed and under large loads.

[0003] Changing the foil geometric parameters of the bearing can improve the stability of the bearing - rotor system in a specific state, but it is difficult to meet the requirements of the bearing - rotor system for stability in multiple states. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention innovatively provides a mechanism for adjusting the support stiffness by changing the stiffness of the underlying arch foil in real - time, which has the characteristics of simple structure and precise adjustable bearing installation position. This mechanism can improve the stability of the elastic foil gas bearing - rotor system by changing the stiffness of the underlying arch foil in real - time.

[0005] To achieve the above - mentioned technical objectives, in a first aspect of the present invention, a gas foil bearing is disclosed, which is used to sleeved on a matching journal. The gas foil bearing includes an elastic foil gas bearing body, a rotating bearing sleeve, a fixed bearing sleeve and a driving device;

[0006] The elastic foil gas bearing body includes an underlying arch foil and a top foil. The top foil is arc - shaped and sleeved on the journal. The underlying arch foil is correspondingly supported outside the top foil, and the underlying arch foil is arc - shaped;

[0007] The underlying arch foil is sleeved with the rotating bearing sleeve and the fixed bearing sleeve arranged circumferentially. The underlying arch foil is fixedly connected to the rotating bearing sleeve and the fixed bearing sleeve respectively. The connection point of the underlying arch foil and the rotating bearing sleeve and the connection point of the underlying arch foil and the fixed bearing sleeve are axially staggered;

[0008] The driving device drives the rotating bearing sleeve to rotate, so as to compress or stretch the waveform arch of the underlying arch foil.

[0009] Further, a first fixing groove is provided on the inner side wall of the rotating bearing sleeve, and a first fixing structure is provided on the underlying arch foil. The first fixing structure is fixed in the first fixing groove.

[0010] Further, a second fixing groove is provided on the inner side wall of the fixed bearing sleeve, a second fixing structure is provided on the bottom arch foil, and the second fixing structure is fixed in the second fixing groove.

[0011] Further, a third fixing structure is provided on the top foil, and the third fixing structure is fixed in the second fixing groove.

[0012] Further, the axial length of the first fixing structure is less than or equal to the axial length of the rotating bearing sleeve, and the axial length of the second fixing structure is less than or equal to the axial length of the fixed bearing sleeve.

[0013] Further, the bottom arch foil includes a plurality of foils arranged axially, the second fixing structure is connected to all the foils, and the first fixing structure is provided on at least one of the foils.

[0014] Further, an avoidance groove is provided on the inner side wall of the rotating bearing sleeve for avoiding the second fixing structure.

[0015] Further, a plurality of the first fixing grooves are arranged circumferentially on the rotating bearing sleeve.

[0016] Further, the first fixing groove is a T-shaped groove or an L-shaped groove.

[0017] To achieve the above technical object, a second aspect of the present invention discloses a transmission device, including the elastic foil gas bearing with adjustable support stiffness described in the first aspect above.

[0018] The beneficial effects of the present invention are as follows:

[0019] When the rotating bearing sleeve rotates, one end of the bottom arch foil fixed to the rotating bearing sleeve moves, the bottom arch foil is compressed or stretched, the stiffness changes, the top foil is supported on the bottom arch foil, and the stiffness of the elastic foil gas bearing body changes accordingly, so that the supporting force on the journal is different, thereby improving the adjustment accuracy of the supporting stiffness of the journal. Description of the Drawings

[0020] Figure 1 is a three-dimensional structural schematic diagram of the elastic foil gas bearing with adjustable support stiffness according to an embodiment of the present invention.

[0021] Figure 2 is a side view of the elastic foil gas bearing with adjustable support stiffness according to an embodiment of the present invention.

[0022] Figure 3 is another side view of the elastic foil gas bearing with adjustable support stiffness according to an embodiment of the present invention.

[0023] Figure 4 It is a cross-sectional view in the A-A direction (hiding the journal) of the elastic foil gas bearing with adjustable support stiffness according to an embodiment of the present invention.

[0024] Figure 5 It is a schematic three-dimensional structure diagram of the top foil according to an embodiment of the present invention.

[0025] Figure 6 It is a side view of the bottom arch foil according to an embodiment of the present invention.

[0026] Figure 7 It is a schematic three-dimensional structure diagram of the bottom arch foil according to an embodiment of the present invention.

[0027] Figure 8 It is a schematic three-dimensional structure diagram of the bottom arch foil according to another embodiment of the present invention.

[0028] Figure 9 It is a side view of the rotating bearing sleeve according to an embodiment of the present invention.

[0029] Figure 10 It is a schematic three-dimensional structure diagram of the rotating bearing sleeve according to an embodiment of the present invention.

[0030] Figure 11 It is a side view of the rotating bearing sleeve according to another embodiment of the present invention.

[0031] Figure 12 It is a schematic three-dimensional structure diagram of the fixed bearing sleeve according to an embodiment of the present invention.

[0032] In the figure,

[0033] 1. Rotating bearing sleeve; 11. Avoidance groove; 12. First fixing groove; 13. Worm gear; 2. Fixed bearing sleeve; 21. Second fixing groove; 3. Elastic foil gas bearing body; 31. Bottom arch foil; 310. Foil; 311. First fixing structure; 312. Second fixing structure; 32. Top foil; 321. Third fixing structure; 4. Fixed block; 5. Worm; 6. Driving device; 7. Journal. Specific Embodiment

[0034] The elastic foil gas bearing with adjustable support stiffness and the transmission device provided by the present invention will be explained and described in detail below with reference to the accompanying drawings of the specification.

[0035] This embodiment specifically discloses an elastic foil gas bearing with adjustable support stiffness, as Figures 1-4As shown, it is used to be sleeved on a matching journal 7, and includes an elastic foil gas bearing body 3, a rotating bearing sleeve 1, a fixed bearing sleeve 2, and a driving device 6; the elastic foil gas bearing body 3 includes a bottom arch foil 31 and a top foil 32. The top foil 32 is arc-shaped, and the top foil 32 is sleeved on the journal 7, that is, the top foil 32 is sleeved on the outside of the journal 7; the bottom arch foil 31 is correspondingly supported on the outside of the top foil 32; the bottom arch foil 31 is also arc-shaped. In this embodiment, both the top foil 32 and the bottom arch foil 31 are close to a cylindrical shape, that is, a cylindrical shape with an opening along the axial direction, having two ends, and the two ends are not connected.

[0036] In this embodiment, the inner side refers to the side close to the central axis of the elastic foil gas bearing, and the outer side refers to the side far from the central axis of the elastic foil gas bearing. The inner and outer are relative directions.

[0037] As Figure 1 and 4 As shown, a rotating bearing sleeve 1 and a fixed bearing sleeve 2 arranged axially are sleeved outside the bottom arch foil 31, that is, the rotating bearing sleeve 1 and the fixed bearing sleeve 2 are arranged axially along the bottom arch foil 31. The bottom arch foil 31 is fixedly connected to the rotating bearing sleeve 1 and the fixed bearing sleeve 2 respectively. The connection point between the bottom arch foil 31 and the rotating bearing sleeve 1 and the connection point between the bottom arch foil 31 and the fixed bearing sleeve 2 are staggered axially, that is, the projections of the two connection points in the axial direction are arranged circumferentially. The top foil 31 is connected to the bottom arch foil 31 or the fixed bearing sleeve 2 at the connection point between the bottom arch foil 31 and the fixed bearing sleeve 2, that is, the elastic foil gas bearing body 3 as a whole is fixedly connected to the fixed bearing sleeve 2.

[0038] The driving device 6 drives the rotating bearing sleeve 1 to rotate, so as to compress or stretch the waveform arch of the bottom arch foil 31. The bottom arch foil 31 is formed by connecting a plurality of waveform arches in the circumferential direction. When the rotating bearing sleeve 1 rotates, the rotating bearing sleeve 1 drives the waveform arch of the bottom arch foil 31 to move, so that the waveform arch is compressed or stretched, and the density changes. The degree of compression or stretching is related to the rotation stroke of the rotating bearing sleeve 1.

[0039] The connection point between the bottom arch foil 31 and the rotating bearing sleeve 1 and the connection point between the bottom arch foil 31 and the fixed bearing sleeve 2 can be at the end of the bottom arch foil 31 or on the arc section of the bottom arch foil 31. As Figure 2 shown, when the rotating bearing sleeve 1 rotates clockwise, the waveform arch between the two connection points is compressed, the density becomes larger, and the stiffness becomes larger; when the rotating bearing sleeve 1 rotates in the opposite direction (counterclockwise), the waveform arch between the two connection points is stretched, the density becomes smaller, and the stiffness becomes smaller.

[0040] Preferably, the ends of the top foil 32 and the bottom arch foil 31 on the same side are fixedly connected to the fixed bearing sleeve 2, and the other end or the vicinity of the other end of the bottom arch foil 31 is fixedly connected to the rotating bearing sleeve 1. That is, the distance between the two connection points is maximized, so that the adjustment range of the stiffness is maximized, and the overall stiffness of the bottom arch foil 31 can be adjusted.

[0041] Optionally, as Figure 5 shown, the top foil 32 is integrally cylindrical, and a third fixing structure 321 is provided on the top foil 32. The third fixing structure 321 is used for fixedly connecting with the fixed rotating bearing 2. Preferably, the third fixing structure 321 is provided at the end of the top foil 32 and on the outer side surface of the top foil 32. The third fixing structure 321 can be an L-shaped or T-shaped bend. The third fixing structure 321 can be welded or riveted to the top foil 32, or can be integrally formed.

[0042] As Figures 6-8 shown, a second fixing structure 312 is provided at the same position as the third fixing structure 321 on the bottom arch foil 31. The second fixing structure 312 is provided on the outer side surface of the bottom arch foil 31 and is used for fixedly connecting with the fixed rotating bearing 2. Preferably, the second fixing structure 312 is provided at the same position as the third fixing structure 321, at the end of the bottom arch foil 31. The second fixing structure 312 is an L-shaped bend. The second fixing structure 321 can be welded or riveted to the bottom arch foil 31, or can be integrally formed.

[0043] As Figures 1-3 shown, when the bottom arch foil 31 is supported outside the top foil 32, the L-shaped second fixing structure 312 is located in the space bent by the third fixing structure 321.

[0044] As Figure 12 shown, a second fixing groove 21 is provided on the inner side wall of the fixed bearing sleeve 2. As Figure 2 and 3 shown, the second fixing structure 312 of the bottom arch foil 31 is fixed in the second fixing groove 21, and the third fixing structure 321 of the top foil 32 is also fixed in the second fixing groove 21. It can be directly snapped or connected by bolts or screws in a threaded manner. This not only realizes the connection between the top foil 32 and the bottom arch foil 31, but also realizes the fixed connection between the elastic foil gas bearing body 3 and the fixed bearing sleeve 2.

[0045] To facilitate the fixation of the top foil 32 and the bottom arch foil 31, the elastic foil gas bearing with adjustable support stiffness of the present application further includes a fixing block 4. The fixing block 4 can be arranged in the second fixing groove 21 and installed between the side wall of the second fixing groove 21, the second fixing structure 312 and the third fixing structure 321 to fill the second fixing groove 21 and firmly fix the second fixing structure 312 and the third fixing structure 321 in the second fixing groove 21.

[0046] As Figures 6-8 shown, a first fixing structure 311 is provided on the bottom arch foil 31, and the first fixing structure 311 is used for fixedly connecting with the rotating bearing sleeve 1. As Figures 9-11 shown, a first fixing groove 12 is provided on the inner side wall of the rotating bearing sleeve 1. As Figure 1 and 2 shown, the first fixing structure 311 on the outer side wall of the bottom arch foil 31 is fixed in the first fixing groove 12.

[0047] Optionally, the first fixing groove 12 is a T-shaped groove or an L-shaped groove, and the shape of the first fixing structure 311 matches the shape of the first fixing groove 12. The first fixing structure 311 is an L-shaped or T-shaped bend bent outward from the bottom arch foil 31, and the first fixing structure 311 is directly snap-fitted or connected to the first fixing groove 12 by bolts or screws in a threaded manner.

[0048] The bottom of the first fixing structure 311 can be welded or riveted to the bottom arch foil 31, or can be integrally formed.

[0049] In some embodiments, as Figure 7 shown, the bottom arch foil 31 is an integrally formed foil. The length of the first fixing structure 311 along the axial direction is less than or equal to the length of the rotating bearing sleeve 1 along the axial direction, and the length of the second fixing structure 312 along the axial direction is less than or equal to the length of the fixed bearing sleeve 2 along the axial direction, so as to avoid interference. The length of the third fixing structure 321 along the axial direction is less than or equal to the length of the second fixing structure 312 along the axial direction. The rotating bearing sleeve 1 is sleeved on the part of the bottom arch foil 31 where the first fixing structure 311 is located, and the fixed bearing sleeve 2 is sleeved on the part of the bottom arch foil 31 where the second fixing structure 312 is located. The second fixing structure 312 will not extend into the rotating bearing sleeve 1 and will not affect the rotation of the rotating bearing sleeve 1. The rotating bearing sleeve 1 drives the part of the bottom arch foil 31 where the first fixing structure 311 is located to rotate, so that the waveform arch of this part is compressed or stretched to adjust the stiffness.

[0050] If the second fixing structure 312 and / or the third fixing structure 321 are relatively long, they will extend into the rotating bearing sleeve 1 after assembly. As Figure 9 and 10As shown in the figure, an avoidance groove 11 is provided on the inner side wall of the rotating bearing sleeve 1 for avoiding the second fixing structure 312 and / or the third fixing structure 321. The avoidance groove is arc-shaped in the circumferential direction, and the length of the arc is set according to the rotation stroke length of the rotating bearing sleeve 1. The avoidance groove 11 does not affect the rotation of the rotating bearing sleeve 1.

[0051] In some other embodiments, as Figure 8 shown, the bottom arch foil 31 includes a plurality of foils 310 arranged axially. The second fixing structure 312 is connected to all the foils 310, and a first fixing structure 311 is provided on at least one foil 310. Each foil is connected by a plurality of waveform arches, and the waveform arch densities of the plurality of foils can be the same or different. The second fixing structure 312 connects all the foils 310 into a whole and fixedly connects the whole bottom arch foil 31 to the fixed bearing sleeve 2.

[0052] When two or more foils 310 are provided with the first fixing structure 311, all the first fixing structures 311 are integrally formed and are on the same axis.

[0053] When the elastic foil gas bearing body 3 is installed in the bearing sleeve, the foil 310 provided with the first fixing structure 311 is arranged in the rotating bearing sleeve 1, and the other foils 310 are arranged in the fixed bearing sleeve 2. An avoidance groove 11 is provided on the inner side wall of the rotating bearing sleeve 1 for avoiding the second fixing structure 312 extending into the rotating bearing sleeve 1. Separating the foils 310 (i.e., the foils 310 with adjustable stiffness) that will be driven by the rotating bearing sleeve 1 to be compressed or stretched from the other foils 310 can more accurately adjust the stiffness of the bottom arch foil 31.

[0054] The rotating bearing sleeve 1 is integrally cylindrical, and a first fixing groove 12 is provided on the inner side wall. The first fixing groove 12 can be an L-shaped groove or a T-shaped groove. As Figure 9 and 10 shown, one first fixing groove 12 is provided on the rotating bearing sleeve 1; as Figure 11 shown, a plurality of first fixing grooves 12 are arranged along the circumferential direction on the rotating bearing sleeve 1. Preferably, the plurality of first fixing grooves 12 are concentrated in the circumferential direction of the rotating bearing sleeve 1 and are arranged near the end of the bottom arch foil. The position of the first fixing groove 12 fixedly connected to the first fixing structure 311 can be selected in the initial state of installing the elastic foil gas bearing. That is, when the position of the first fixing groove 12 fixedly connected to the first fixing structure 311 is different, the deformation amount of the waveform arch of the bottom arch foil is different, so that the pre-tension degree of the bottom arch foil is different and the stiffness is different. By providing a plurality of first fixing grooves 12, the pre-installation position of the bottom arch foil can be selected, thereby adjusting the pre-tension force.

[0055] Optionally, the driving device 6 is connected to the rotating bearing sleeve 1 through a transmission device, and the transmission device can be a worm and gear transmission mechanism. As Figures 1-3 shown, a worm gear 13 is sleeved outside the rotating bearing sleeve 1, the driving device 6 is connected to a worm 5, and the worm 5 meshes with the worm gear teeth on the outer ring of the rotating bearing sleeve 1.

[0056] The driving device 6 can be a motor, and the motor can be a driving motor or a stepping motor. The output shaft of the motor is coaxially connected to the worm 5.

[0057] The working principle of the flexible foil gas bearing according to the embodiment of the present application:

[0058] When the bearing is working, when the rotating bearing sleeve 1 rotates, one end of the bottom arch foil 31 fixed on the rotating bearing sleeve 1 moves, the bottom arch foil 31 is compressed or stretched, the stiffness changes, the bottom arch foil 31 supports the top foil 32, and the stiffness of the flexible foil gas bearing body 3 changes accordingly, so that the supporting force on the journal 7 is different, thereby improving the adjustment accuracy of the supporting stiffness of the journal 7.

[0059] The specific adjustment range of the stiffness is related to the rotation stroke length of the rotating bearing sleeve 1.

[0060] The flexible foil gas bearing of the present application has the following advantages:

[0061] 1. When the rotating bearing sleeve 1 rotates, one end of the bottom arch foil 31 fixed on the rotating bearing sleeve 1 moves, the bottom arch foil 31 is compressed or stretched, the stiffness changes, the bottom arch foil 31 supports the top foil 32, and the stiffness of the flexible foil gas bearing body 3 changes accordingly, so that the supporting force on the journal 7 is different, thereby improving the adjustment accuracy of the supporting stiffness of the journal 7.

[0062] 2. A plurality of first fixing grooves 12 are provided on the rotating bearing sleeve 1 of the present invention, and the pre-installation position of the flexible foil gas bearing can be adjusted, thereby adjusting the pre-tension degree and thus adjusting the stiffness. The bottom arch foil 31 adopts a multi-foil design, and a combination of foils with different stiffnesses is used, so that the adjustment is more accurate and the range is wider.

[0063] This embodiment also discloses a transmission device, including the flexible foil gas bearing described in the above embodiment. The transmission device can be applied in the fields of aerospace, energy equipment, etc.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0065] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the description of this specification, the descriptions with reference to the terms "this embodiment", "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any at least one embodiment or example. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of these features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and simple improvements made to the substantial content of the present invention should be included in the protection scope of the present invention.

Claims

1. An elastic foil gas bearing with adjustable support stiffness, used for sleeve mounting on a matching shaft neck (7), comprising an elastic foil gas bearing body (3), characterized in that: It also includes a rotating bearing sleeve (1), a fixed bearing sleeve (2) and a driving device (6); The elastic foil gas bearing body (3) comprises a bottom arch foil (31) and a top foil (32), the top foil (32) being in an arc shape, the top foil (32) being sleeved on the shaft neck (7), the bottom arch foil (31) being supported on the outer side of the top foil (32), and the bottom arch foil (31) being in an arc shape; The bottom arch foil (31) is provided with the rotating bearing sleeve (1) and the fixed bearing sleeve (2) arranged in the axial direction on its outer shell, and the bottom arch foil (31) is fixedly connected to the rotating bearing sleeve (1) and the fixed bearing sleeve (2) respectively, and the connection point between the bottom arch foil (31) and the rotating bearing sleeve (1) and the connection point between the bottom arch foil (31) and the fixed bearing sleeve (2) are staggered in the axial direction; The driving device (6) drives the rotating bearing sleeve (1) to rotate, so as to compress or stretch the corrugated arch of the bottom arch foil (31).

2. The elastic foil gas bearing with adjustable support stiffness according to claim 1, characterized in that: A first fixing groove (12) is provided on the inner side wall of the rotating bearing sleeve (1), and a first fixing structure (311) is provided on the bottom arch foil (31), wherein the first fixing structure (311) is fixed in the first fixing groove (12).

3. The elastic foil gas bearing with adjustable support stiffness according to claim 2, characterized in that: A second fixing groove (21) is provided on the inner side wall of the fixed bearing sleeve (2), a second fixing structure (312) is provided on the bottom arch foil (31), and the second fixing structure (312) is fixed in the second fixing groove (21).

4. The elastic foil gas bearing with adjustable support stiffness according to claim 3, characterized in that: A third fixing structure (321) is provided on the top foil (32), and the third fixing structure (321) is fixed in the second fixing groove (21).

5. The elastic foil gas bearing with adjustable support stiffness according to claim 3, characterized in that: The axial length of the first fixing structure (311) is less than or equal to the axial length of the rotating bearing sleeve (1), and the axial length of the second fixing structure (312) is less than or equal to the axial length of the fixed bearing sleeve (2).

6. The elastic foil gas bearing with adjustable support stiffness according to claim 3, characterized in that: The bottom arch foil (31) comprises a plurality of foils (310) arranged along the axial direction, the second fixing structure (312) is connected to all the foils (310), and the first fixing structure (311) is arranged on at least one of the foils (310).

7. The elastic foil gas bearing with adjustable support stiffness according to claim 6, characterized in that: An avoidance groove (11) is provided on the inner side wall of the rotating bearing sleeve (1) for avoiding the second fixing structure (312).

8. The elastic foil gas bearing with adjustable support stiffness according to any one of claims 2 to 7, characterized in that: The rotary bearing sleeve (1) is provided with a plurality of the first fixing grooves (12) along the circumferential direction.

9. The elastic foil gas bearing with adjustable support stiffness according to any one of claims 2 to 7, characterized in that: The first fixing groove (12) is a T-shaped groove or an L-shaped groove.

10. A transmission device, characterized in that: An elastic foil gas bearing with adjustable support stiffness comprising the one described in any one of claims 1-9.

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