Elastic foil gas bearing and transmission device

Abstract

The present invention belongs to the field of mechanical transmission technology, and discloses an elastic foil gas bearing and a transmission device. The elastic foil gas bearing comprises a bearing body, an elastic cylindrical shell, a three-degree-of-freedom flexible support platform, a piezoelectric telescopic mechanism and a shell. The bearing body is used to be sleeved on a matching shaft neck; the elastic cylindrical shell is sleeved on the bearing body, the bearing body and the elastic cylindrical shell are fixedly connected, the shell is sleeved outside the elastic cylindrical shell, and there is a gap between the elastic cylindrical shell and the shell; a plurality of three-degree-of-freedom flexible support platforms are evenly distributed along the circumference of the elastic cylindrical shell, one end is tightly attached to the outer wall of the elastic cylindrical shell, and the other end is fixed to the inner surface of the shell; a piezoelectric telescopic mechanism is also arranged between the three-degree-of-freedom flexible support platform and the shell. The transmission device comprises the above-mentioned elastic foil gas bearing. The present invention can realize the precise adjustment of the air gap of the elastic foil gas bearing.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and more specifically, the present invention relates to an elastic foil gas bearing and a transmission device. Background Art

[0002] Bearings are components that fix and reduce the load friction coefficient during mechanical transmission. Their main function is to support mechanical rotating bodies to reduce the mechanical load friction coefficient of the equipment during transmission. In recent years, with the increasing application of high-speed rotating machinery in aerospace, energy equipment and other fields, the working environment has become increasingly harsh, and the requirements for lubrication and support have gradually increased. In oil-free lubrication systems, compared with complex and expensive support methods such as electromagnetic bearings, elastic foil gas bearings have the advantages of high speed, good adaptability, no wear, low cost, high reliability, and high temperature resistance. They do not require additional auxiliary devices such as oil supply, have a simple structure, and are one of the key technologies for oil-free lubrication.

[0003] Conventional air foil bearings rely on the high-speed rotating rotor to exert pressure on the gas, using the wedge effect to generate dynamic pressure to carry the load. This bearing uses elastic foil as its structure, which not only has a certain rigidity, but also provides a shock-absorbing effect, allowing the bearing to withstand a certain load. However, due to the cross-coupling effect of gas dynamic pressure, the stability of this bearing-rotor system is not ideal.

[0004] The traditional solution is to set one or more preload devices on the periphery of the bearing. However, after the preload device is installed, the adjustment range and adjustment method are fixed. Especially when the load changes, the transmission preload device can only passively adapt to the load change, with a narrow adaptation range and poor dynamic performance. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention innovatively provides an elastic foil gas bearing and transmission device, which can actively and dynamically compress the bearing, thereby accurately adjusting the air gap, improving the stability and dynamic performance of the bearing, and can adapt to load changes and speed changes in real time, with a wide range of adaptability.

[0006] To achieve the above technical objectives, the present invention discloses, in a first aspect, an elastic foil gas bearing, comprising: a bearing body, an elastic cylindrical shell, a three-degree-of-freedom flexible support platform, a piezoelectric telescopic mechanism and a housing, wherein the bearing body is used to be sleeved on a matching shaft neck;

[0007] The elastic cylindrical shell is sleeved on the bearing body, and the bearing body and the elastic cylindrical shell are fixedly connected.

[0008] The outer shell is sleeved outside the elastic cylindrical thin shell, and there is a gap between the elastic cylindrical thin shell and the outer shell;

[0009] A plurality of three-degree-of-freedom flexible support platforms are evenly distributed along the circumference of the elastic cylindrical thin shell, one end of which is closely attached to the outer wall of the elastic cylindrical thin shell, and the other end is fixed to the inner surface of the outer shell;

[0010] A piezoelectric telescopic mechanism is also arranged between the three-degree-of-freedom flexible support platform and the shell.

[0011] Furthermore, the bearing body comprises a bottom arch foil and a top foil; the top foil is arc-shaped, and a plurality of the top foils are evenly distributed along the circumference of the journal and attached to the journal; the bottom arch foil is supported correspondingly under each top foil.

[0012] Furthermore, the three-degree-of-freedom flexible support platform includes a top platform, a flexible support oblique arm, a flexible support cross arm and a bottom fixed column; a supporting protrusion is arranged on the top platform, and the top platform is connected to the flexible support cross arm through a plurality of flexible support oblique arms distributed circumferentially along the top platform, the plurality of flexible support oblique arms and the plurality of flexible support cross arms are connected one-to-one, the plurality of flexible support cross arms intersect below the top platform, and the bottom fixed column is fixedly connected to the lower surface of the intersection of the plurality of flexible support cross arms.

[0013] Furthermore, the flexible supporting oblique arm is columnar, and includes a first flexible connecting section whose bending direction is consistent with the arm length direction of the flexible supporting oblique arm and a second flexible connecting section whose bending direction is consistent with the vertical direction of the arm length of the flexible supporting oblique arm, and the second flexible connecting section is connected to the bottom end of the first flexible connecting section.

[0014] Furthermore, a through slot is provided on the flexible supporting cross arm.

[0015] Furthermore, the piezoelectric telescopic mechanism includes a telescopic amplification mechanism and a piezoelectric actuator. The piezoelectric actuator is installed inside the telescopic amplification mechanism. The telescopic amplification mechanism is used to amplify the telescopic movement of the piezoelectric actuator.

[0016] Furthermore, the telescopic magnification mechanism is a multi-stage lever mechanism composed of a flexible hinge and a plurality of rods, and the rods are connected by the flexible hinge.

[0017] Furthermore, the piezoelectric telescopic mechanism also includes a support plate, on which a protrusion for fixing the telescopic amplification mechanism is provided.

[0018] Furthermore, a plurality of three-degree-of-freedom flexible support platforms and piezoelectric telescopic mechanisms are arranged along the axial direction of the bearing.

[0019] In order to achieve the above technical objectives, the second aspect of the present invention discloses a transmission device, including the elastic foil gas bearing described in the first aspect.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention can actively and dynamically adjust the clamping position and the clamping point of the elastic foil gas bearing in real time, can adapt to the working conditions of load changes and speed changes in real time, and has a wide range of adaptability.

[0022] 2. The elastic foil gas bearing and transmission device of the present invention can adjust the clamping position and clamping force of the gas bearing in three directions through a three-degree-of-freedom flexible support platform and a piezoelectric telescopic mechanism, thereby more accurately adjusting the air gap and enabling the bearing to obtain better stability and dynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of an elastic foil gas bearing according to an embodiment of the present invention.

[0024] Figure 2 It is a schematic structural diagram of an elastic foil gas bearing according to an embodiment of the present invention (the bearing body is hidden, and only one three-degree-of-freedom flexible support platform and one piezoelectric telescopic mechanism are shown).

[0025] Figure 3 It is an exploded schematic diagram of the assembly of a three-degree-of-freedom flexible support platform and a piezoelectric telescopic mechanism according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the structure of a three-degree-of-freedom flexible support platform according to an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the coordination of the telescopic amplification mechanism, the support plate and the piezoelectric actuator according to an embodiment of the present invention.

[0028] 1. Bearing body; 11. Top foil; 12. Bottom foil; 2. Elastic cylindrical shell; 3. Three-degree-of-freedom flexible support platform; 31. Top platform; 311. Support protrusion; 32. Flexible support oblique arm; 321. First flexible connection section; 322. Second flexible connection section; 33. Flexible support cross arm; 331. Through slot; 34. Bottom fixed column; 4. Telescopic amplification mechanism; 41. First rod; 42. Second rod; 43. Third rod; 44. Fourth rod; 45. Fifth rod; 46. Sixth rod; 46. Sixth rod; 47. Seventh oblique rod; 48. Push block; 5. Piezoelectric actuator; 6. Journal; 7. Support plate; 71. Protrusion; 8. Housing. DETAILED DESCRIPTION

[0029] The elastic foil gas bearing and the transmission device provided by the present invention are explained and illustrated in detail below in conjunction with the drawings in the specification.

[0030] This embodiment specifically discloses an elastic foil gas bearing, such as Figure 1-2As shown, the elastic foil gas bearing comprises a bearing body 1, an elastic cylindrical shell 2, a three-degree-of-freedom flexible support platform 3 and a piezoelectric telescopic mechanism, wherein the bearing body 1 is used to be sleeved on a matching shaft neck 6; the elastic cylindrical shell 2 is sleeved on the bearing body 1, the bearing body 1 and the elastic cylindrical shell 2 are fixedly connected, the outer shell 8 is sleeved outside the elastic cylindrical shell 2, there is a gap between the elastic cylindrical shell 2 and the outer shell 8, the three-degree-of-freedom flexible support platform 3 is arranged in the gap between the elastic cylindrical shell 2 and the outer shell 8, and a plurality of three-degree-of-freedom flexible support platforms 3 are evenly distributed along the circumference of the elastic cylindrical shell 2, one end is tightly attached to the outer wall of the elastic cylindrical shell 2, and the other end is fixed to the inner surface of the outer shell 8; a piezoelectric telescopic mechanism is also arranged between the three-degree-of-freedom flexible support platform 3 and the outer shell 8. The pressing position and pressing force of the gas bearing can be adjusted in three directions by the three-degree-of-freedom flexible support platform and the piezoelectric telescopic mechanism, so that the air gap can be adjusted more accurately, so that the bearing can obtain better stability and dynamic performance. The clamping position and clamping point of the elastic foil gas bearing can be actively and dynamically adjusted in real time, and can adapt to the working conditions of load changes and speed changes in real time, with a wide range of adaptability.

[0031] like Figure 1 As shown, the bearing body 1 includes a bottom arch foil 12 and a top foil 11; the top foil 11 is arc-shaped, and multiple top foils 11 are evenly distributed along the circumference of the journal and attached to the journal 6; a bottom arch foil 12 is supported correspondingly below each top foil 11.

[0032] Multiple three-degree-of-freedom flexible support platforms 3 and piezoelectric telescopic mechanisms can be arranged along the axial direction of the bearing, so as to more accurately support the elastic cylindrical thin shell 2. Optionally, in the same circumferential direction, four three-degree-of-freedom flexible support platforms 3 and piezoelectric telescopic mechanisms are evenly distributed along the circumference of the elastic cylindrical thin shell 2 to form a group of circumferential components, and 2-3 groups of such circumferential components can be arranged along the axial direction of the bearing.

[0033] like Figure 3As shown, the three-degree-of-freedom flexible support platform 3 includes a top platform 31, a flexible support oblique arm 32, a flexible support cross arm 33 and a bottom fixed column 34. The top platform 31 is connected to the flexible support cross arm 33 through a plurality of flexible support oblique arms 32 distributed along the circumference of the top platform 31. The number of the flexible support oblique arms 32 is the same as the number of the flexible support cross arms 33. The plurality of flexible support oblique arms 32 and the plurality of flexible support cross arms 33 are connected one by one. The plurality of flexible support oblique arms 32 are evenly distributed along the circumference of the top platform 31. The top end of the flexible support oblique arm 32 is fixedly connected to the top platform 31. The bottom end of the flexible support oblique arm 32 is fixedly connected to the flexible support cross arm 33. The plurality of flexible support cross arms 33 intersect below the top platform 31. The bottom fixed column 34 is fixedly connected to the lower surface of the intersection of the plurality of flexible support cross arms 33. The top end of the bottom fixed column 34 has a necking design. The bottom fixed column 34 can be a triangular prism, a cylinder or other shapes. The number of the piezoelectric telescopic mechanisms is the same as the number of the flexible support cross arms 33 , and the piezoelectric telescopic mechanisms are arranged in a one-to-one correspondence with the flexible support cross arms 33 . The piezoelectric telescopic mechanisms are arranged between the flexible support cross arms 33 and the housing 8 .

[0034] Preferably, the number of the flexible support oblique arms 32 and the flexible support horizontal arms 33 in each three-degree-of-freedom flexible support platform 3 is 3, and they are evenly distributed along the circumference of the top platform 31.

[0035] The top platform 31 is provided with a support protrusion 311, which can be hemispherical or in other shapes. The number of the support protrusion 311 can be one or more. When the number of the support protrusion 311 is one, the support protrusion 311 is set in the center of the top platform 31; when the number of the support protrusion 311 is more than one, in addition to being set in the center of the top platform 31, it can also be set at the edge of the top platform 31 close to the flexible support oblique arm 32, and the number is preferably the same as the number of the flexible support oblique arm 32. Figure 3 Taking the three flexible supporting oblique arms 32 as an example, the total number of supporting protrusions 311 can be four.

[0036] When the top platform 31 moves horizontally, vertically or tilts, the plurality of supporting protrusions 311 can achieve a better effect of accurately pressing the elastic cylindrical shell 2 .

[0037] like Figure 4As shown, the flexible supporting oblique arm 32 is generally columnar, and the flexible supporting oblique arm 32 includes a first flexible connection section 321 whose bending direction is consistent with the arm length direction of the flexible supporting oblique arm 32, and a second flexible connection section 322 whose bending direction is consistent with the vertical direction of the arm length of the flexible supporting oblique arm 32, and the second flexible connection section 322 is connected to the bottom end of the first flexible connection section 321. The top end of the first flexible connection section 321 is fixedly connected to the top platform 31, the bottom end of the first flexible connection section 321 is fixedly connected to the top end of the second flexible connection section 322, and the bottom end of the second flexible connection section 322 is fixedly connected to the flexible supporting cross arm 33. The first flexible connection section 321 or the second flexible connection section 322 can be an I-shaped or a rectangular parallelepiped with symmetrical semi-cylindrical grooves, and the first flexible connection section 321 and the second flexible connection section 322 have a certain flexibility and a certain rigidity. As shown Figure 4 As shown, the first flexible connection joint 321 can swing up and down along the I-shape (the bending direction is consistent with the arm length direction of the flexible supporting oblique arm 32), and the second flexible connection joint 322 can swing left and right in the I-shape (the bending direction is consistent with the vertical direction of the arm length of the flexible supporting oblique arm 32).

[0038] The flexible support cross arm 33 is hollowed out and has a through slot 331 thereon. The through slot 331 runs through the flexible support cross arm 33 from left to right. The cross-sectional shape of the through slot 331 can be rectangular or triangular, and the flexible support cross arm 33 can bend and deform to a certain extent.

[0039] The piezoelectric telescopic mechanism is arranged below the flexible support cross arm 33 and abuts against the flexible support cross arm 33. When the piezoelectric telescopic mechanism is extended and retracted up and down, it can drive the flexible support cross arm 33 to rotate up and down around the middle of the bottom fixed column 34 and the flexible support cross arm 33, thereby driving the flexible support inclined arm 32 to push the top platform 31 to move.

[0040] When the telescopic lengths of the piezoelectric telescopic mechanisms under each flexible support cross arm 33 are inconsistent, the bottom positions of the flexible support oblique arms 32 will be different, thereby driving the top platform 31 to move vertically or horizontally or tilt the top platform 31. The top platform 31 is provided with a supporting protrusion 311, which can squeeze the elastic cylindrical shell 2 from different positions, different angles, and different forces, thereby achieving more precise adjustment of the air gap at different positions of the elastic foil gas bearing.

[0041] like Figure 5 As shown, the piezoelectric telescopic mechanism can be a separate piezoelectric actuator. Generally, piezoelectric actuators can use piezoelectric ceramics. However, due to the relatively small mechanical deformation of piezoelectric ceramics, there are certain limitations in application. If a sufficiently large telescopic amount is required, the length of the piezoelectric ceramic will be very large, resulting in the inability to reduce the size of the shell.

[0042] In order to solve this problem, the applicant has made a special design for the piezoelectric telescopic mechanism. The piezoelectric telescopic mechanism includes a telescopic amplification mechanism 4 and a piezoelectric actuator 5. The piezoelectric actuator 5 is installed inside the telescopic amplification mechanism 4. The telescopic amplification mechanism 4 is used to amplify the telescopic motion of the piezoelectric actuator 5. The telescopic amplification mechanism 4 and the piezoelectric actuator 5 are used in conjunction with each other, and the piezoelectric actuator 5 is horizontally installed inside the telescopic amplification mechanism 4. The telescopic amplification mechanism 4 is a multi-stage lever mechanism composed of a flexible hinge and a plurality of rods, and the rods are connected by flexible hinges. Through the multi-stage lever, the amplification factor of the piezoelectric actuator 5 can be better amplified, and at the same time, the structure is more compact, which can better reduce the size of the outer shell, thereby reducing the radial size of the elastic foil gas bearing, so that the elastic foil gas bearing can be applied to more scenarios.

[0043] Next, the structure of the telescopic magnification mechanism 4 is specifically introduced. The telescopic magnification mechanism 4 is designed to be bilaterally symmetrical as a whole, which can effectively reduce stress. Figure 5 As shown, the telescopic magnification mechanism 4 includes a first rod 41 arranged at the bottom, and the first rod 41 is connected to a vertically arranged second rod 42 on both sides through flexible hinges, and the side of the second rod 42 away from the first rod 41 is connected to a vertically arranged third rod 43 through a flexible hinge, the two third rods are located on the inner sides of the two second rods, and the side of the third rod 43 facing the second rod 42 is connected to a fixedly arranged fourth rod 44 through a flexible hinge, and the side of the third rod 43 facing the second rod 42 is connected to a horizontally arranged horizontal short rod fifth rod 45 through another flexible hinge, the fifth rod 45 is located above the fourth rod 44, and the side of the fifth rod 45 away from the third rod 43 is flush with the side of the fourth rod 44 in the length direction, and the side of the fifth rod 45 away from the third rod 43 is connected to the middle part of the side of the vertical long rod sixth rod 46 through a flexible hinge, and the side of the fourth rod 44 away from the third rod 43 is connected to the bottom of the side of the sixth rod 46 through a flexible hinge. The top of the sixth rod 46 near the third rod 43 is connected to the seventh oblique rod 47 through a flexible hinge, and the end (top) of the seventh oblique rod 47 away from the sixth rod 46 is connected to a push block 48. The second rod to the seventh oblique rod are all arranged in pairs symmetrically, and one push block 48 is provided, and the left and right ends of the push block 48 are respectively connected to the tops of the two seventh oblique rods 47. The piezoelectric actuator 5 is transversely arranged between the two second rods 42, and the piezoelectric actuator 5 keeps a distance from the third rod 43 above it, and the piezoelectric actuator 5 also keeps a distance from the first rod 41 below it.

[0044] Next, the principle of the telescopic amplification mechanism 4 is introduced. When the piezoelectric actuator 5 is extended, the piezoelectric actuator 5 squeezes the middle of the second rod 42 on the left and right sides. The bottom end of the second rod 42 is restricted by the first rod 41, and the top end swings in the direction of the extension of the piezoelectric actuator 5, resulting in a first round of amplification. The top end of the second rod 42 drives the bottom of the third rod 43 to swing in the direction of the extension of the piezoelectric actuator 5. Since the third rod 43 is restricted by the fourth rod 44, the top end of the third rod 43 swings in the opposite direction of the extension direction of the piezoelectric actuator 5, resulting in a first round of amplification. A second round of amplification occurs, thereby driving the fifth rod 45 to move in the opposite direction of the extension direction of the piezoelectric actuator 5. The right end of the fifth rod 45 drives the sixth rod 46 to swing in the opposite direction of the extension direction of the piezoelectric actuator 5 through the flexible hinge. The sixth rod 46 drives the seventh oblique rod 47 to swing in the opposite direction of the extension direction of the piezoelectric actuator 5 through the flexible hinge, resulting in a third round of amplification. The end (top end) of the seventh oblique rod 47 away from the sixth rod 46 moves upward due to the restriction of the pushing block 48.

[0045] By using a multi-stage lever mechanism composed of a flexible hinge and a plurality of rods as a telescopic amplification mechanism, the telescopic movement of the horizontally placed piezoelectric actuator can be amplified multiple times, thereby reducing the overall radial dimension of the bearing and making the bearing more adaptable.

[0046] The fourth rod 44 may be provided with two through holes for easy fixation. Figure 3 and 5 As shown, the telescopic magnification mechanism 4 further includes a support plate 7, on which four protrusions 71 for fixing the fourth rod 44 of the telescopic magnification mechanism 4 are provided, and the four protrusions 71 are in the shape of pins and can pass through four through holes of a pair of fourth rods 44, thereby fixing the fourth rod 44. The support plate 7 can be connected to the inner surface of the housing 8 by bolts and screws or welded.

[0047] Working principle of the elastic foil gas bearing of the embodiment of the present application:

[0048] When the bearing is working, as the journal 6 rotates, a gradient dynamic pressure is formed in the wedge-shaped space between the journal 6 and the top foil 11, so that the journal 6 is completely separated from the contact with the top foil 11, forming a stable lubricating air film and achieving an air film suspension working state.

[0049] When the thickness of the air film needs to be adjusted, or when the load changes, the piezoelectric actuator 5 can be used to drive the telescopic amplification mechanism 4 to perform multiple stroke amplification, which can respond quickly. Through the synchronous or asynchronous telescopic amplification of the telescopic amplification mechanism 4 arranged under the three-degree-of-freedom flexible support platform 3 (multiple telescopic amplification mechanisms 4 under a three-degree-of-freedom flexible support platform 3 can be telescopically amplified or asynchronously amplified), the top platform 31 of the three-degree-of-freedom flexible support platform 3 can be driven to move horizontally or vertically or tilt. The support protrusion 311 located on the top platform 31 can achieve different positions, different angles, and different forces to compress the elastic cylindrical shell 2, thereby compressing the bearing body 1, thereby adjusting the air film thickness at the local position, that is, the air gap, thereby affecting the dynamic performance of the entire bearing.

[0050] The elastic foil gas bearing of the present application has the following advantages:

[0051] 1. The present invention can actively and dynamically adjust the clamping position and the clamping point of the elastic foil gas bearing in real time, can adapt to the working conditions of load changes and speed changes in real time, and has a wide range of adaptability.

[0052] 2. The elastic foil gas bearing and transmission device of the present invention can adjust the clamping position and clamping force of the gas bearing in three directions through a three-degree-of-freedom flexible support platform and a piezoelectric telescopic mechanism, thereby more accurately adjusting the air gap and enabling the bearing to obtain better stability and dynamic performance.

[0053] 3. By using a multi-stage lever mechanism composed of a flexible hinge and a plurality of rods as a telescopic amplification mechanism, the telescopic movement of the horizontally placed piezoelectric actuator can be amplified multiple times, thereby reducing the overall radial dimension of the bearing and making the bearing more adaptable.

[0054] This embodiment also discloses a transmission device, including the elastic foil gas bearing described in the above embodiment. The transmission device can be used in the fields of aerospace, energy equipment, etc.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention should be included in the protection scope of the present invention.

Claims

1. An elastic foil gas bearing, characterized in that: include: A bearing body (1), an elastic cylindrical shell (2), a three-degree-of-freedom flexible support platform (3), a piezoelectric telescopic mechanism and a shell (8), wherein the bearing body (1) is used to be sleeved on a matching shaft neck (6); The elastic cylindrical thin shell (2) is sleeved on the bearing body (1), and the bearing body (1) and the elastic cylindrical thin shell (2) are fixedly connected. The outer shell (8) is sleeved outside the elastic cylindrical thin shell (2), and a gap is provided between the elastic cylindrical thin shell (2) and the outer shell (8); The plurality of three-degree-of-freedom flexible support platforms (3) are evenly distributed along the circumference of the elastic cylindrical shell (2), one end of which is tightly attached to the outer wall of the elastic cylindrical shell (2), and the other end is fixed to the inner surface of the outer shell (8); the three-degree-of-freedom flexible support platform (3) comprises a top platform (31), a flexible support oblique arm (32), a flexible support cross arm (33) and a bottom fixed column (34); a support protrusion (311) is provided on the top platform (31), and the top platform (31) is connected to the flexible support cross arm (33) through a plurality of flexible support oblique arms (32) distributed along the circumference of the top platform (31), the plurality of flexible support oblique arms (32) and the plurality of flexible support cross arms (33) are connected in a one-to-one correspondence, the plurality of flexible support cross arms (33) intersect below the top platform (31), and the bottom fixed column (34) is fixedly connected to the lower surface of the intersection of the plurality of flexible support cross arms (33); A piezoelectric telescopic mechanism is also provided between the three-degree-of-freedom flexible support platform (3) and the housing (8); the number of the piezoelectric telescopic mechanisms is the same as the number of the flexible support cross arms (33); the piezoelectric telescopic mechanisms and the flexible support cross arms (33) are provided in a one-to-one correspondence; and the piezoelectric telescopic mechanism is provided between the flexible support cross arms (33) and the housing (8).

2. The elastic foil gas bearing according to claim 1, characterized in that: The bearing body (1) comprises a bottom arch foil (12) and a top foil (11); The top foil (11) is in an arc shape, and a plurality of the top foils (11) are evenly distributed along the circumference of the shaft neck (6) and are attached to the shaft neck (6); The bottom arch foil (12) is correspondingly supported below each top foil (11).

3. The elastic foil gas bearing according to claim 1, characterized in that: The flexible support oblique arm (32) is columnar, and comprises a first flexible connection section (321) whose bending direction is consistent with the arm length direction of the flexible support oblique arm (32) and a second flexible connection section (322) whose bending direction is consistent with the vertical direction of the arm length of the flexible support oblique arm (32), and the second flexible connection section (322) is connected to the bottom end of the first flexible connection section (321).

4. The elastic foil gas bearing according to claim 1, characterized in that: The flexible supporting cross arm (33) is provided with a through slot (331).

5. The elastic foil gas bearing according to any one of claims 1 to 4, characterized in that: The piezoelectric telescopic mechanism comprises a telescopic amplification mechanism (4) and a piezoelectric actuator (5). The piezoelectric actuator (5) is installed inside the telescopic amplification mechanism (4). The telescopic amplification mechanism (4) is used to amplify the telescopic movement of the piezoelectric actuator (5).

6. The elastic foil gas bearing according to claim 5, characterized in that: The telescopic and magnifying mechanism (4) is a multi-stage lever mechanism composed of a flexible hinge and a plurality of rods, and the rods are connected by the flexible hinge.

7. The elastic foil gas bearing according to claim 5, characterized in that: The piezoelectric telescopic mechanism also includes a support plate (7), on which a protrusion (71) for fixing the telescopic amplification mechanism (4) is provided.

8. The elastic foil gas bearing according to claim 1, characterized in that: A plurality of three-degree-of-freedom flexible support platforms (3) and piezoelectric telescopic mechanisms are arranged along the axial direction of the bearing.

9. A transmission device, characterized in that: The invention comprises the elastic foil gas bearing as described in any one of claims 1 to 8.

Images