An independently movable multi-spring slotted composite air bearing

Abstract

The present invention discloses an independently movable multi-spring-flake slotted composite air bearing, comprising a bearing seat and a rotating shaft, and also comprising a bearing outer ring and an outer sliding spring-flake ring. A left limiting ring and a right limiting ring are symmetrically arranged at both ends of the bearing outer ring. The outer sliding spring-flake ring comprises a slot marking ring and a plurality of independent arch springs arranged on the slot marking ring. When subjected to externally excited vibration, the shaft seat springs and the independent arch springs are deformed to dissipate part of the externally excited vibration energy. The slot sliding ring can rotate around the axis within the range limited by the left limiting ring. Through the mechanical conversion of the independent arch spring system, the circumferential reciprocating vibration maintains the dissipation of linear vibration energy while reducing the system amplitude, and maintains the rigid bearing seat while ensuring the advantage of small clearance of the system pneumatic components. This ensures that the bearing seat can still follow the vibration movement when subjected to externally excited vibration, reduces the load on the bearing, and ensures that the air film between the bearing seat and the rotating shaft will not be unstable or broken due to the externally excited vibration.

Description

Technical Field

[0001] The invention relates to the field of foil-type bearings, in particular to an independently movable multi-elastic-sheet slotted composite air bearing. Background Art

[0002] Air bearings are widely used in the industrial field. The higher the speed of conventional mechanical contact rolling bearings, the higher the requirements for bearing accuracy and lubrication, and the shorter the service life. Air bearings suspend the main shaft in the air, without mechanical contact, using clean air as a lubricant, and reducing the degree of wear to a minimum. However, they are currently widely used in non-road and non-strong external vibration scenarios, and face challenges in strong external vibration scenarios such as road use.

[0003] Different application scenarios have very different requirements for air bearings. Mobile machinery has external vibrations that are quite different from non-mobile machinery operating conditions. Especially in the automotive field, the vehicle vibration caused by the unevenness of the road will give the air bearing a strong external excitation through the tires and the body. This excitation is relatively complex, and its load spectrum is related to the road state, vehicle state, and vehicle operating state. This excitation often causes large changes in the air bearing load, causing the bearing-bearing air film to change, fluctuate, and break, which in turn damages the air bearing or even causes it to fail.

[0004] Problems to be solved by the invention: Mobile rotating machinery has large differences in operating conditions during operation. Due to the harsh road environment and human factors, the externally excited vibrations it is subjected to during operation are transmitted to the existing foil bearings. The vibration acceleration of this externally excited vibration varies greatly, and the vibration frequency also varies greatly. The maximum value of the vibration acceleration often exceeds the maximum bearing capacity of the existing foil bearings. The foil itself is made of a very thin elastic metal sheet, which is very easily deformed by the vibration force. The thin foil deforms under externally excited vibration, causing the "air film formation boundary" to deform. This deformation is uneven along the circumference of the rotating shaft, causing the air film to change, fluctuate, and break, and cannot maintain a continuous, regular, and stable structure, which in turn causes the shaft to fail to rotate normally. It is necessary to ensure that the deformation of the air film boundary meets the requirements of fluid dynamics from aspects such as structural design and foil stiffness, so as to ensure that the air film works normally and efficiently. Summary of the invention

[0005] The purpose of the present invention is to improve the problem of poor stability of existing foil bearings and to provide an independently movable multi-spring slotted composite air bearing. When the air film is in a stable environment, the air film has good stability. The pneumatic components of the system can obtain higher aerodynamic efficiency with a smaller aerodynamic gap, so that the bearing seat can move with the spring, thereby keeping the air film between the bearing seat and the shaft continuous and stable, ensuring stable operation of the bearing system.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An independently movable multi-spring-piece slotted composite air bearing comprises a bearing seat and a rotating shaft, and also comprises a bearing outer ring and an outer sliding spring-piece ring. A left limiting ring and a right limiting ring which are symmetrically arranged are arranged at both ends of the bearing outer ring. The outer sliding spring-piece ring comprises a slot sliding ring and a plurality of independent arch spring pieces arranged on the slot sliding ring, wherein: each independent arch spring piece protrudes inwardly, each independent arch spring piece is sequentially connected end to end, and the slot sliding ring and the bearing outer ring are slidably matched; the bearing seat is located in the outer sliding spring-piece ring, and a plurality of shaft seat spring pieces are arranged on the outer wall of the bearing seat, wherein: the number of shaft seat spring pieces and the number of independent arch spring pieces correspond to each other, and the shaft seat spring pieces and the independent arch spring pieces are fixedly connected to each other. When subjected to external vibration, the bearing seat is displaced first, and then the shaft seat shrapnel connected to the bearing seat is deformed. Therefore, the bearing seat can vibrate with the shrapnel system. The deformation of the shaft seat shrapnel and the independent arch shrapnel will dissipate part of the external vibration energy. The slot slip ring has limits in the radial, circumferential and axial directions and is movable. The slot slip ring can rotate around the axis within the range limited by the left limiting ring. Through the mechanical conversion of the independent arch shrapnel system, the circumferential reciprocating vibration maintains the dissipation of linear vibration energy while reducing the system amplitude, maintaining the rigid bearing seat while ensuring the advantage of small clearance of the system pneumatic components. At the same time, the position of the slot slip ring can be adjusted by vibration and the tension of the shrapnel itself when subjected to external vibration, so as to obtain radially different isotropic vibration modal characteristics of the system. This ensures that the bearing seat can still follow the vibration movement when subjected to external vibration, reduces the load on the bearing, and ensures that the air film between the bearing seat and the rotating shaft will not be unstable or broken due to external vibration.

[0008] Preferably, the left limit ring is provided with multiple left limit strips, and the right limit ring is provided with multiple right limit strips. The left limit ring and the right limit ring are fixed to the outer ring of the bearing, and each left limit strip and right limit strip is located in the cavity formed by the slot slip ring and the independent arch spring piece.

[0009] Preferably, the width of each left limit clamping strip is half of the width of the independent arch spring piece, and the slot slip ring and the independent arch spring piece slide back and forth between two adjacent left limit clamping strips. The independent arch spring piece and the slot slip ring slide in the circumferential direction to buffer and reduce the vibration energy of the system.

[0010] Preferably, the number of the left limit card strips and the number of the right limit card strips are both five, and the left limit card strips are arranged at equal intervals on the left limit ring, and the right limit card strips are arranged at equal intervals on the right limit ring.

[0011] Preferably, the number of the independent arch spring pieces and the number of the shaft seat spring pieces are both five.

[0012] Preferably, in each bearing spring piece: the shaft seat spring piece includes a middle bearing part and two symmetrically arranged elastic support feet, the middle bearing part is arc-shaped, a plurality of wedge-shaped slots are arranged on the outer wall of the bearing seat, and the elastic support feet are clamped on the wedge-shaped slots. The elastic support feet are used to absorb vibration energy after deformation, and the middle bearing part mainly transmits most of the vibration energy to the independent arch spring piece.

[0013] Preferably, the middle bearing part is arc-shaped, and the midpoint of each middle bearing part and the midpoint of the corresponding independent arch spring piece are welded and fixed to each other. The welding fixation makes the transmission efficiency of the independent arch spring piece and the shaft seat spring piece higher and more stable.

[0014] Preferably, the middle bearing portion and the elastic supporting feet are an integrally formed structure.

[0015] The invention also includes a driving motor, which includes a stator and an outer rotor. A coupling is provided between the outer rotor and the slot slip ring. The rotation of the outer rotor drives the slot slip ring to reciprocate along the outer ring of the bearing. The rotation of the outer rotor drives the slot slip ring to rotate along the outer ring of the bearing, which can dissipate the vibration energy received by the circumferential rotation and improve the overall stability.

[0016] The beneficial technical effects of the present invention are as follows: the shaft seat spring piece and the independent arch spring piece are protruded toward each other, and the contact points at the midpoint of each spring piece are welded. The bearing can still follow the vibration movement when subjected to external excitation vibration, and the slot slip ring can rotate around the axis within a limited range. Through the mechanical conversion of the spring piece system, the reciprocating vibration maintains the dissipation of linear vibration energy while reducing the system amplitude. The air film between the bearing seat and the shaft will no longer be unstable or broken due to external excitation vibration. Through the support system structure and material property design, the bearing elastic support system has different stiffness and natural frequency along the circumference of the bearing, and changes along the circumference, so that the system maintains different damping modal characteristics along different directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a schematic cross-sectional view of the present invention;

[0019] Figure 3 It is a schematic diagram of the assembly structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the shaft seat spring piece structure of the present invention;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the external motor of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings. The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solution of the present invention. Any changes to the definitions of components or technical features or formal but not substantial changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention. Example

[0023] like Figure 1 As shown: an independently movable multi-spring slotted composite air bearing includes a bearing seat 2 and a rotating shaft 1, and also includes a bearing outer ring 4 and an outer sliding spring ring 3. The two ends of the bearing outer ring 4 are provided with a left limit ring 5 and a right limit ring 6 which are symmetrically arranged.

[0024] like Figure 2 As shown: the outer sliding spring ring 3 includes a slot slip ring 31 and five independent arch springs 32 arranged on the slot slip ring, wherein: each independent arch spring 32 protrudes inward, and the independent arch springs are sequentially connected end to end to surround the annular outer sliding spring ring 3, and the slot slip ring 31 and the bearing outer ring 4 are slidably matched; the bearing seat 2 is located in the outer sliding spring ring 3, and a plurality of shaft seat springs 21 are arranged on the outer wall of the bearing seat 2, wherein: the number of shaft seat springs 21 and the number of independent arch springs 32 correspond one to one, and the shaft seat springs and the independent arch springs are fixedly connected to each other.

[0025] like Figure 3 As shown: the left limit ring 5 is provided with five left limit strips 51 arranged at equal intervals, and the right limit ring 6 is provided with five right limit strips 61 arranged at equal intervals. The left limit ring and the right limit ring are clamped and fixed to the outer ring of the bearing, and each left limit strip and right limit strip is located in the cavity formed by the slot slip ring 31 and the independent arch spring piece 32.

[0026] The width of each left limit clamping strip 51 is half of the width of the independent arch spring piece 32 , and the slot slip ring 31 and the independent arch spring piece 32 slide back and forth between two adjacent left limit clamping strips.

[0027] like Figure 2 and Figure 4 As shown: in each bearing spring piece: the shaft seat spring piece 21 includes a middle bearing portion 211 and two symmetrically arranged elastic support legs 212, the middle bearing portion is arc-shaped, a plurality of wedge-shaped slots 20 are provided on the outer wall of the bearing seat 2, and the elastic support legs are clamped on the wedge-shaped slots 20. The elastic support legs are used to absorb vibration energy after deformation, and the middle bearing portion mainly transmits most of the vibration energy to the independent arch spring piece.

[0028] Among them: the middle bearing part 211 is arc-shaped, and the midpoint of each middle bearing part 211 and the midpoint of the corresponding independent arch spring piece 32 are welded and fixed to each other. By welding and fixing, the transmission efficiency of the independent arch spring piece and the shaft seat spring piece is higher and more stable. The middle bearing part 211 and the elastic support foot 212 are an integrally formed structure, and the elastic support foot 212 is heat-treated to achieve appropriate elasticity and rigidity.

[0029] like Figure 5 As shown: it also includes a driving motor 7, which includes a stator 71 and an outer rotor 72. A coupling 73 is provided between the outer rotor 72 and the slot slip ring 31. The rotation of the outer rotor 72 drives the slot slip ring 31 to reciprocate along the outer ring of the bearing. The rotation of the outer rotor drives the slot slip ring to rotate along the outer ring of the bearing, which can dissipate the vibration energy received by circumferential rotation and improve the overall stability.

[0030] In this embodiment: when subjected to external vibration, the bearing seat 2 is displaced first, and then the shaft seat spring piece 21 connected to the bearing seat 2 is deformed. Therefore, the bearing seat 2 can vibrate with the spring piece system. The deformation of the shaft seat spring piece and the independent arch spring piece 32 will dissipate part of the external vibration energy. The slot slip ring 31 has limits in the radial, circumferential and axial directions and is movable. The slot slip ring 31 can rotate around the axis within the range limited by the left limiting ring. Through the mechanical conversion of the independent arch spring piece system, the circumferential reciprocating vibration maintains the dissipation of linear vibration energy while reducing the system amplitude, maintaining the rigid bearing seat 2 while ensuring the advantage of small clearance of the system pneumatic components. At the same time, the position of the slot slip ring 31 can be adjusted by vibration and spring piece tension itself when subjected to external vibration, and radially different isotropic vibration modal characteristics of the system can be obtained. This ensures that the bearing seat can still follow the vibration movement when subjected to external vibration, reduces the load on the bearing, and ensures that the air film between the bearing seat 2 and the rotating shaft 1 will not be unstable or broken due to external vibration.

[0031] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An independently movable multi-spring slotted composite air bearing, comprising a bearing seat (2) and a rotating shaft (1), characterized in that: It also includes a bearing outer ring (4) and an outer sliding spring ring (3), wherein two ends of the bearing outer ring (4) are provided with a left limit ring (5) and a right limit ring (6) which are symmetrically arranged, and the outer sliding spring ring (3) includes a slot slip ring (31) and a plurality of independent arch springs (32) arranged on the slot slip ring, wherein: each independent arch spring (32) protrudes inwardly, each independent arch spring is connected end to end in sequence, and the slot slip ring (31) and the bearing outer ring (4) are slidably matched; The bearing seat (2) is located inside the outer sliding spring ring (3), and a plurality of shaft seat springs (21) are provided on the outer wall of the bearing seat (2), wherein: the shaft seat springs (21) and the independent arch springs (32) are in one-to-one correspondence, and the shaft seat springs and the independent arch springs are fixedly connected to each other; In each bearing spring piece: the shaft seat spring piece (21) comprises a middle bearing portion (211) and two symmetrically arranged elastic support legs (212), the middle bearing portion is arc-shaped, a plurality of wedge-shaped slots (20) are provided on the outer wall of the bearing seat (2), and the elastic support legs are clamped on the wedge-shaped slots (20).

2. The independently movable multi-spring slotted composite air bearing according to claim 1, characterized in that: The left limit ring (5) is provided with a plurality of left limit clips (51), and the right limit ring (6) is provided with a plurality of right limit clips (61). The left limit ring and the right limit ring are fixedly connected to the outer ring of the bearing, and each left limit clip and the right limit clip are located in a cavity formed by the slot slip ring (31) and the independent arch spring sheet (32).

3. The independently movable multi-spring slotted composite air bearing according to claim 2, characterized in that: The width of each left limit clamping strip (51) is half of the width of the independent arch spring piece (32), and the slot slip ring (31) and the independent arch spring piece (32) slide back and forth between two adjacent left limit clamping strips.

4. The independently movable multi-spring slotted composite air bearing according to claim 2, characterized in that: There are five left limit card strips and five right limit card strips. The left limit card strips are arranged on the left limit ring at equal intervals, and the right limit card strips are arranged on the right limit ring at equal intervals.

5. The independently movable multi-spring slotted composite air bearing according to claim 1, characterized in that: The number of the independent arched spring pieces (32) and the number of the shaft seat spring pieces (21) are both five.

6. The independently movable multi-spring slotted composite air bearing according to claim 1, characterized in that: in: The middle bearing portion (211) is arc-shaped, and the midpoint of each middle bearing portion (211) and the midpoint of the corresponding independent arch spring piece (32) are welded and fixed to each other.

7. The independently movable multi-spring slotted composite air bearing according to claim 1, characterized in that: The middle bearing portion (211) and the elastic supporting foot (212) are an integrally formed structure.

8. The independently movable multi-spring slotted composite air bearing according to claim 1, characterized in that: The invention also comprises a driving motor (7), the driving motor comprising a stator (71) and an outer rotor (72), a coupling (73) being provided between the outer rotor (72) and the slot slip ring (31), and the outer rotor (72) rotates to drive the slot slip ring (31) to rotate along the inner wall of the bearing outer ring (4).

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