Air bearing structure

Abstract

The utility model discloses an air bearing structure which comprises a bearing seat, a bearing inner ring and a bearing outer ring, the bearing outer ring is assembled on the bearing seat, the bearing inner ring is assembled in the bearing outer ring, the bearing seat is provided with a first air hole used for conveying air, and the bearing outer ring is provided with a second air hole used for being matched with the first air hole. The bearing outer ring is provided with air passing grooves used in cooperation with the second air holes, and the bearing inner ring is made of a microporous material. Through the arrangement of the first air holes, the second air holes and the air passing grooves and the arrangement of the bearing inner ring made of the microporous material, the introduced high-pressure air can be more uniform and stable, so that an air film formed between an external shaft and the bearing inner ring is more uniform and stable, and the stability of the air bearing under high load and high rotating speed can be better realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, and particularly discloses an air bearing structure. Background Technique

[0002] An air bearing, also known as an air bearing or a gas bearing, uses an air film formed between relatively moving parts to support the load. Since the viscosity coefficient of the gas is much lower than that of the oil film, the thickness of its lubricating film can be very small, generally between 1 and 10 microns. Such bearings can generally be divided into two categories: static pressure air bearings and dynamic pressure gas bearings. The static pressure air bearing pressurizes the air film through a gas supply system to provide the required bearing capacity and motion accuracy, while the dynamic pressure gas bearing relies on the high-speed flow of gas between the moving parts to generate power, thereby forming a bearing capacity.

[0003] The bearing capacity and stiffness of air bearings are relatively low, which limits their use in some applications that require high bearing capacity or high stiffness. By adjusting the gas pressure and the air film thickness, the bearing capacity and stiffness of air bearings can be controlled. The air film thickness has a direct relationship with the rotational speed. As the rotational speed increases, the air film thickness will gradually decrease. When the rotational speed is high enough, the air film thickness can be almost negligible because the gas molecules will form turbulence under high-speed rotation, making the air film thickness very thin. The air film thickness has a great influence on the performance of air bearings. When the air film thickness becomes thinner, the stiffness and shock absorption capacity of the bearing will decrease, and vibration and wear are likely to occur. Therefore, it is necessary to solve the stability of air bearings under high load and high rotational speed. Content of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide an air bearing structure.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: it includes a bearing housing, an inner bearing ring, and an outer bearing ring. The outer bearing ring is assembled on the bearing housing, the inner bearing ring is assembled inside the outer bearing ring. The bearing housing is provided with a first air hole for air supply, the outer bearing ring is provided with a second air hole for cooperating with the first air hole, the outer bearing ring is provided with an air passage groove for cooperating with the second air hole, and the material of the inner bearing ring is a microporous material.

[0006] Further, the number of the first air holes, the number of the second air holes, and the number of the air passage grooves are all multiple, and the first air holes, the second air holes, and the air passage grooves correspond to each other one by one.

[0007] Further, the bearing housing is fixedly connected to the outer bearing ring. A plurality of air passage grooves are arranged along the central axis direction of the outer bearing ring. The air passage grooves are recessed from the inner wall of the outer bearing ring and do not penetrate the outer bearing ring.

[0008] Furthermore, a plurality of first air holes penetrate through the side wall of the bearing housing, and a plurality of second air holes penetrate through the side wall of the bearing outer ring. The plurality of first air holes and the plurality of second air holes are respectively communicated.

[0009] Furthermore, there are three first air holes, second air holes and air passing grooves respectively.

[0010] Furthermore, the material of the bearing inner ring is microporous graphite.

[0011] Furthermore, a first boss protrudes from one side of the bearing inner ring, and a second boss that is in abutting fit with the first boss protrudes from one side of the bearing outer ring. A thrust member for restricting the axial position of the first boss is provided on the other side of the first boss. The thrust member is arranged on the shaft in the outside world, and the second boss is connected to the bearing housing.

[0012] Furthermore, a first rubber ring for sealing the gap between the two is provided between the first boss and the second boss. The second boss is provided with a receiving groove for receiving the first rubber ring. The first rubber ring axially protrudes out of the receiving groove and abuts against the first boss.

[0013] Furthermore, a rear end cover is connected to one side of the bearing outer ring. A second rubber ring for sealing the gap between the bearing inner ring and the bearing outer ring is provided between the bearing outer ring and the rear end cover. The rear end cover is connected to the bearing housing; the second rubber ring covers the connection part of the bearing outer ring and the bearing inner ring in a ring shape, and the rear end cover covers the second rubber ring.

[0014] Furthermore, the bearing outer ring is fixedly connected to the rear end cover. The bearing housing is provided with a groove for receiving the rear end cover. The rear end cover is detachably connected with a limiting member, and the bearing housing has a limiting groove for receiving the limiting member.

[0015] After adopting the above structure, the advantages of the present utility model compared with the prior art are as follows: Microporous graphite has the characteristic of high air permeability. The two sides of the axial position of the bearing inner ring are sealed with the first rubber ring and the second rubber ring. Three mutually communicated first air holes and second air holes are provided between the bearing outer ring and the bearing housing. Three air passing grooves for cooperating with the first air holes and the second air holes are provided on the inner wall of the bearing inner ring. High-pressure gas passes through the bearing inner ring to form a stable air film with a thickness of 0.01 - 0.03 mm between the bearing inner ring and the shaft in the outside world. The arrangement of the three first air holes, second air holes and air passing grooves can better achieve the stability of the input of high-pressure gas, so that the formed air film can be more uniform and stable, and can better achieve the stability of the air floating bearing under high load and high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 It is a schematic structural diagram of a structure of an air floating bearing of the present utility model;

[0018] Figure 2It is a sectional view of an air floating bearing structure of the present utility model;

[0019] Figure 3 It is the first exploded view of the present utility model;

[0020] Figure 4 It is the second exploded view of the present utility model;

[0021] Figure 5 It is the sectional view of the outer ring of the bearing of the present utility model

[0022] Figure 6 It is the schematic bottom view structure of an air floating bearing of the present utility model.

[0023] Reference numerals include: 1, bearing seat; 11, first air hole; 12, limiting groove; 2, inner bearing ring; 21, first boss; 3, outer bearing ring; 31, second air hole; 32, air passage groove; 33, second boss; 34, accommodating groove; 4, thrust piece; 5, first rubber ring; 6, second rubber ring; 7, front end cover; 8, rear end cover; 9, limiting piece. Detailed implementation manners

[0024] The following are only the preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly.

[0025] As Figures 1 to 6 shown, an air floating bearing structure provided by the present utility model includes a bearing seat 1, an inner bearing ring 2 and an outer bearing ring 3. The outer bearing ring 3 is assembled on the bearing seat 1, the inner bearing ring 2 is assembled inside the outer bearing ring 3. The bearing seat 1 is provided with a first air hole 11 for air input, the outer bearing ring 3 is provided with a second air hole 31 for cooperating with the first air hole 11, the outer bearing ring 3 is provided with an air passage groove 32 for cooperating with the second air hole 31, and the material of the inner bearing ring 2 is a microporous material.

[0026] During actual use, the high-pressure gas input through the first air hole 11 and the second air hole 31 flows into the air passage groove 32, and the gas radially passes through the inner bearing ring 2 to form an air film between the inner bearing ring 2 and the external shaft for bearing the external shaft.

[0027] Specifically, the number of the first air holes 11, the number of the second air holes 31 and the number of the air passage grooves 32 are all multiple, and the first air holes 11, the second air holes 31 and the air passage grooves 32 correspond to each other one by one.

[0028] During actual use, the arrangement of multiple first air holes 11, second air holes 31 and air passage grooves 32 can make the input high-pressure gas more evenly and stably distributed.

[0029] Specifically, the bearing housing 1 is fixedly connected to the outer bearing ring 3. A plurality of air passage grooves 32 are arranged along the central axis direction of the outer bearing ring 3. The air passage grooves 32 are recessed from the inner wall of the outer bearing ring 3 and do not penetrate through the outer bearing ring 3.

[0030] Specifically, a plurality of first air holes 11 penetrate through the side wall of the bearing housing 1, and a plurality of second air holes 31 penetrate through the side wall of the outer bearing ring 3. The plurality of first air holes 11 and the plurality of second air holes 31 are respectively communicated.

[0031] Specifically, there are three first air holes 11, second air holes 31, and air passage grooves 32 respectively.

[0032] During actual use, the high-pressure gas input through the three communicated first air holes 11 and second air holes 31 flows into the three air passage grooves 32. The three first air holes 11, second air holes 31, and air passage grooves 32 are linearly arranged, forming a more stable air film between the inner bearing ring 2 and the external shaft.

[0033] Specifically, the material of the inner bearing ring 2 is microporous graphite.

[0034] During actual use, the inner bearing ring 2 is distributed with nano-scale micropores. The high-pressure air radially passes through the inner bearing ring 2 to form a stable air film between the inner bearing ring 2 and the external shaft.

[0035] Specifically, a first boss 21 protrudes from one side of the inner bearing ring 2, and a second boss 33 that is in blocking fit with the first boss 21 protrudes from one side of the outer bearing ring 3. A thrust member 4 for restricting the axial position of the first boss 21 is provided on the other side of the first boss 21. The thrust member 4 is arranged on the external shaft, and the second boss 33 is connected to the bearing housing 1.

[0036] Specifically, a first rubber ring 5 for sealing the gap between the two is provided between the first boss 21 and the second boss 33. The second boss 33 is provided with a receiving groove 34 for receiving the first rubber ring 5. The first rubber ring 5 axially protrudes out of the receiving groove 34 and abuts against the first boss 21.

[0037] During actual use, the first rubber ring 5 is used to seal the gap between the first boss 21 and the second boss 33 to prevent the high-pressure gas from escaping, and the thrust member 4 is used to restrict the axial position of the first boss 21.

[0038] Specifically, a rear end cover 8 is connected and provided on one side of the outer bearing ring 3. A second rubber ring 6 for sealing the gap between the inner bearing ring 2 and the outer bearing ring 3 is provided between the outer bearing ring 3 and the rear end cover 8. The rear end cover 8 is connected to the bearing housing 1; the second rubber ring 6 annularly covers the connection between the outer bearing ring 3 and the inner bearing ring 2, and the rear end cover 8 covers the second rubber ring 6.

[0039] In actual use, when the air bearing is not in the working state, the second rubber ring 6 is used to limit the axial position of the inner ring 2 of the bearing. When the air bearing is in the working state, the second rubber ring 6 can play a sealing role.

[0040] Specifically, the outer ring 3 of the bearing is fixedly connected to the rear end cover 8. The bearing seat 1 is provided with a groove for accommodating the rear end cover 8. The rear end cover 8 is detachably connected with a limiting member 9. The bearing seat 1 has a limiting groove 12 for accommodating the limiting member 9.

[0041] In actual use, when the air bearing is not in the working state, the axial position of the inner ring 2 of the bearing is limited by the thrust member 4 and the rear end cover 8, and the outer ring 3 of the bearing limits the radial position of the inner ring 2 of the bearing. When the air bearing is in the working state, high-pressure gas is input through the second air holes 31 of the outer ring 3 of the bearing and the first air holes 11 of the bearing seat 1. The high-pressure gas fills the air passage groove 32 on the inner wall of the outer ring 3 of the bearing. At the same time, the high-pressure gas forms an air film for bearing the external shaft between the inner ring 2 of the bearing and the external shaft through the inner ring 2 of the bearing. The thickness of the air film can reach 0.01 - 0.03 mm. The outer ring 3 of the bearing is fixedly connected to the bearing seat 1 in the radial direction and is fixedly connected to the front end cover 7 and the rear end cover 8 in the axial direction. The inner ring 2 of the bearing is matched with the outer ring 3 of the bearing in the radial direction. The inner ring 2 of the bearing realizes the sealing function through the first rubber ring 5 and the second rubber ring 6. At the same time, the arrangement of the three first air holes 11, the second air holes 31 and the air passage groove 32 better realizes the uniformity and stability of the high-pressure gas, so that the formation of the air film is more stable, and the stability of the air bearing under high load and high speed can be better realized.

[0042] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An air bearing structure, characterized in that: The invention comprises a bearing seat (1), a bearing inner ring (2) and a bearing outer ring (3), wherein the bearing outer ring (3) is assembled on the bearing seat (1), and the bearing inner ring (2) is assembled in the bearing outer ring (3), the bearing seat (1) is provided with a first air hole (11) for air transmission, the bearing outer ring (3) is provided with a second air hole (31) for cooperating with the first air hole (11), the bearing outer ring (3) is provided with an air groove (32) for cooperating with the second air hole (31), and the bearing inner ring (2) is made of a microporous material.

2. An air bearing structure according to claim 1, characterized in that: The number of the first air holes (11), the number of the second air holes (31) and the number of the air passage grooves (32) are all multiple, and the first air holes (11), the second air holes (31) and the air passage grooves (32) correspond to each other one by one.

3. An air bearing structure according to claim 2, characterized in that: The bearing seat (1) is fixedly connected to the bearing outer ring (3), and a plurality of air grooves (32) are arranged along the central axis direction of the bearing outer ring (3). The air grooves (32) are recessed from the inner wall of the bearing outer ring (3), and the air grooves (32) do not penetrate the bearing outer ring (3).

4. The air bearing structure according to claim 2, characterized in that: A plurality of first air holes (11) penetrate the side wall of the bearing seat (1), a plurality of second air holes (31) penetrate the side wall of the bearing outer ring (3), and the plurality of first air holes (11) and the plurality of second air holes (31) are respectively connected.

5. The air bearing structure according to claim 2, characterized in that: There are three first air holes (11), three second air holes (31) and three air passage slots (32).

6. The air bearing structure according to claim 1, characterized in that: The bearing inner ring (2) is made of microporous graphite.

7. The air bearing structure according to claim 1, characterized in that: One side of the bearing inner ring (2) protrudes to form a first boss (21), and one side of the bearing outer ring (3) protrudes to form a second boss (33) that cooperates with the first boss (21) to stop. The other side of the first boss (21) is provided with a thrust piece (4) for limiting the axial position of the first boss (21). The thrust piece (4) is arranged on an external shaft, and the second boss (33) is connected to the bearing seat (1).

8. An air bearing structure according to claim 7, characterized in that: A first rubber ring (5) for sealing a gap between the first boss (21) and the second boss (33) is provided, and the second boss (33) is provided with a receiving groove (34) for receiving the first rubber ring (5). The first rubber ring (5) axially protrudes out of the receiving groove (34) and contacts the first boss (21).

9. The air bearing structure according to claim 1, characterized in that: A rear end cover (8) is connected to one side of the bearing outer ring (3); a second rubber ring (6) for sealing the gap between the bearing inner ring (2) and the bearing outer ring (3) is provided between the bearing outer ring (3) and the rear end cover (8); the rear end cover (8) is connected to the bearing seat (1); the second rubber ring (6) is annular and covers the connection between the bearing outer ring (3) and the bearing inner ring (2); the rear end cover (8) covers the second rubber ring (6).

10. An air bearing structure according to claim 9, characterized in that: The outer ring of the bearing (3) is fixedly connected to the rear end cover (8), the bearing seat (1) is provided with a groove for accommodating the rear end cover (8), the rear end cover (8) is detachably connected to the limiting member (9), and the bearing seat (1) has a limiting groove (12) for accommodating the limiting member (9).

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