CN219888506U - Gas hydrostatic bearing with damping - Google Patents
Gas hydrostatic bearing with damping Download PDFInfo
- Publication number
- CN219888506U CN219888506U CN202321143249.9U CN202321143249U CN219888506U CN 219888506 U CN219888506 U CN 219888506U CN 202321143249 U CN202321143249 U CN 202321143249U CN 219888506 U CN219888506 U CN 219888506U
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- bearing
- damping
- sleeve
- housing
- damped
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- 238000013016 damping Methods 0.000 title claims abstract description 90
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 18
- 239000007770 graphite material Substances 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 17
- 238000009826 distribution Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Landscapes
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The utility model belongs to the technical field of bearings, and particularly relates to a gas hydrostatic bearing with damping, which comprises a shell body and an end cover, wherein the shell body is arranged in a circumferential multi-layer manner, the end cover is arranged at the end part of the shell body, the shell body comprises a bearing sleeve and a shell, the inner side and the outer wall of a cavity are respectively provided with a damping sleeve gasket, and damping of the bearing sleeve is increased through the damping sleeve gasket; the bearing sleeve and the damping sleeve pad are tightly pressed through a fastening structure arranged in the radial direction, so that the whole aerostatic bearing is of an integrated structure, and the high-speed stability of the bearing is improved. Through setting up porous restrictor and bearing housing as a whole, increased the damping sleeve pad outside the bearing housing, utilize the damping characteristic of damping sleeve pad, the bearing housing can take place tiny displacement under the effect of damping sleeve pad, makes damping sleeve pad play damping effect.
Description
Technical Field
The utility model relates to the technical field of bearings, in particular to a gas hydrostatic bearing with damping.
Background
The aerostatic bearing is one of the sliding bearing forms. When the external compressed gas enters the bearing gap through the restrictor, a lubricating gas film with certain bearing capacity and rigidity is formed in the gap, and the shaft is floated in the bearing by virtue of the lubricating supporting function of the gas film. For the aerostatic bearing, external pressure air supply is adopted as a basic working mode, a throttle is a key of the structure of the aerostatic bearing, and when the main shaft works, the eccentric caused by dead weight and load establishes a corresponding bearing and rigidity machining center mechanism of the bearing.
The gas hydrostatic bearing is widely applied to industrial equipment such as high-precision motion platforms, high-precision spindles and the like, but because of low viscosity of gas and poor damping characteristics, unstable subsynchronous vibration is easily generated when the gas hydrostatic bearing is applied to high-speed rotation, and the safe and stable operation of a system is seriously affected.
In search, CN111720442a discloses a hydrostatic bearing comprising a bearing, a journal cooperating with the bearing, said bearing comprising a body, further comprising: at least three pressing plates which are uniformly arranged on the inner cylindrical surface of the body at intervals; the elastic film is arranged on the inner cylindrical surface of the body in a surrounding manner through the pressing plate; the cylindrical cavity is arranged between two adjacent pressing plates of the inner cylindrical surface of the body; the number of the cylindrical cavities corresponds to the number of the pressing plates; the driving piece is arranged in the cylindrical cavity. The piezoelectric ceramic driver is stretched and shortened to act on the thrust hemisphere to push the film plane to move radially and further drive the air cushion to move radially, so that the size of the air cushion gap is actively controlled, the size of the air film pressure is controlled, and the piezoelectric ceramic driver can be used for improving the rotation precision of the journal, inhibiting the vibration of the journal and actively controlling the axis track.
The utility model relates to a novel aerostatic bearing with damping, which aims to further improve the damping characteristic of the aerostatic bearing and improve the high-speed stability of the aerostatic bearing, and therefore, the novel aerostatic bearing with damping is very necessary in actual production and use.
Disclosure of Invention
The utility model aims at the defects of the prior art, and provides the aerostatic bearing with damping, wherein the porous restrictor and the bearing sleeve are arranged as a whole, the damping sleeve gasket is additionally arranged outside the bearing sleeve, and the bearing sleeve can slightly displace under the action of the damping sleeve gasket by utilizing the damping characteristic of the damping sleeve gasket, so that the damping sleeve gasket plays a damping role.
Further, by adjusting the fastening structure, the minute vibration range of the bearing housing can be adjusted. When the bearing sleeve and the damping sleeve pad are pressed tightly, the smaller the movable range is, the smaller the damping effect is, and the position of the center of the bearing can be finely adjusted by adjusting the position of the fastening structure. Compared with the traditional installation mode of the O-shaped ring, the installation mode of locking by adopting the fastening structure reduces the difficulty of bearing installation and ensures the reliability of installation.
The compression of the fastening structure enables the whole aerostatic bearing to be of an integrated structure so as to improve the high-speed stability of the bearing.
The utility model adopts the technical means for solving the problems that:
the shell comprises a bearing sleeve and a shell, wherein the bearing sleeve and the shell are respectively arranged on the inner side and the outer wall of a cavity, a damping sleeve gasket is arranged between the bearing sleeve and the shell, and damping of the bearing sleeve is increased through the damping sleeve gasket; the bearing sleeve and the damping sleeve pad are tightly pressed through a fastening structure arranged in the radial direction, so that the whole aerostatic bearing is of an integrated structure, and the high-speed stability of the bearing is improved.
The damping hydrostatic bearing with damping provided by the utility model has the advantages that the shell is of a multi-layer structure, the damping characteristic of the damping sleeve gasket is effectively utilized, and the resonance amplitude of a mechanical structure between layers of the shell is reduced, so that the structural damage caused by the fact that the dynamic stress reaches the limit is avoided. A damping sleeve gasket is arranged between the bearing sleeve and the shell, so that the bearing can quickly recover to a stable state after being subjected to instantaneous impact when in use.
Further, the inner wall of the bearing sleeve is provided with a porous restrictor, and the porous restrictor is in clearance fit with the bearing sleeve and is pressed into a whole through a fastening structure.
Further, the porous restrictor is a porous graphite material. The porous material has small pores and uniform pore distribution, and the porous graphite material has a self-lubricating effect, and the rotor and the bearing are not seriously damaged by slight collision, so that the porous graphite material is a good throttling element. In the static pressure gas bearing, the porous static pressure gas bearing has the characteristics of good rigidity, small gas consumption, uniform pressure distribution and uniform rigidity distribution. Because of low viscosity coefficient of gas, the damping characteristic is poor, and subsynchronous vibration is easy to generate during high-speed operation.
Further, the fastening structure comprises a screw and an adjustable nut matched with the screw; one end of the screw rod is fastened with the bearing sleeve and is rigidly connected; the other end and the adjustable nut are adjusted in the counter bore of the shell.
Further, the screw rod is arranged on the bearing sleeve, penetrates through the damping sleeve gasket, the bearing sleeve and the shell, and is screwed in and out of the counter bore of the shell and the through hole of the bearing sleeve. The small vibration range of the bearing sleeve can be adjusted by adjusting the nut. When the bearing sleeve and the damping sleeve pad are pressed more tightly, the smaller the moving range is, the smaller the damping effect is; meanwhile, the position of the center of the bearing can be finely adjusted by adjusting the position of the nut. The effect of shell is the convenience of guaranteeing the bearing installation, and the nut adjustment does not influence the installation of bearing, compares with the mounting means of o type circle in the past, adopts the mounting means of bearing shell, has reduced the degree of difficulty of bearing installation, has guaranteed the reliability of installation.
Further, the outer diameter of the adjustable nut is smaller than the inner diameter of the counter bore of the housing. The way can effectively screw the stroke of the adjustable nut, and the adjustable nut can be hidden in the counter bore after being installed, but the installation and the use of other structures are interfered.
Further, the damping sleeve gasket, the bearing sleeve and the shell are correspondingly provided with air supply pipeline mounting holes. The air supply pipe passes through the damping sleeve gasket and the bearing shell, so that the air supply pipe is ensured to be conveniently connected with the air supply pipeline mounting hole.
Further, the damping sleeve gasket is made of a porous metal material or a high damping alloy material.
Compared with the prior art, the utility model has the beneficial effects that:
the damping sleeve gasket is additionally arranged outside the bearing sleeve, and the bearing sleeve can slightly displace under the action of the damping sleeve gasket by utilizing the damping characteristic of the damping sleeve gasket, so that the damping sleeve gasket plays a damping role.
The damping hydrostatic bearing with damping provided by the utility model has the advantages that the shell is of a multi-layer structure, the damping characteristic of the damping sleeve gasket is effectively utilized, and the resonance amplitude of a mechanical structure between layers of the shell is reduced, so that the structural damage caused by the fact that the dynamic stress reaches the limit is avoided. A damping sleeve gasket is arranged between the bearing sleeve and the shell, so that the bearing can quickly recover to a stable state after being subjected to instantaneous impact when in use.
Meanwhile, the damping sleeve gasket is beneficial to reducing the sound radiation generated by mechanical vibration and reducing mechanical noise. In particular to a precision machine tool, which needs higher shock resistance and dynamic stability when working in a dynamic environment, and the dynamic performance of the precision machine tool can be greatly improved through various damping treatments.
The static pressure gas bearing can be widely applied to industrial equipment such as high-precision motion platforms, high-precision spindles and the like, and is beneficial to reducing the capability of structure for transmitting vibration.
Drawings
Fig. 1 is a schematic structural view of a damped aerostatic bearing according to the present utility model.
Figure 2 is a quarter cut-away view of a damped aerostatic bearing according to the present utility model.
Fig. 3 is a top view of a damped aerostatic bearing according to the present utility model.
FIG. 4 is a schematic cross-sectional view of an A-A structure of the damped aerostatic bearing of FIG. 3.
The device comprises a 10-bearing sleeve, a 11-annular mounting seat, a 20-shell, a 30-damping sleeve gasket, a 40-porous restrictor, a 2-end cover, a 3-fastening structure, a 31-screw, a 32-adjustable nut, a 40-porous restrictor, a 41-counter bore, a 42-air supply pipeline mounting hole, a 43-through hole, a 5-air supply pipe, a 51-hose, a 6-quick connector and a 7-air pipe protective sleeve.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1-4, the aerostatic bearing with damping in this embodiment includes a housing with multiple layers arranged in a circumferential direction and an end cover 2 mounted at an end of the housing, the housing includes a bearing sleeve 10 and a housing 20 respectively arranged at an inner side and an outer wall of a cavity, a damping sleeve pad 30 is arranged between the bearing sleeve 10 and the housing 20, and damping of the bearing sleeve is increased by the damping sleeve pad 30; the damping sleeve pad 30 is made of a porous metal material or a high damping alloy material, and in this embodiment, the porous metal material has many excellent properties, such as high specific surface area, high porosity, high permeability, high strength, high corrosion resistance, etc.; when the damping is improved in the aerostatic bearing, the whole aerostatic bearing is enabled to reduce vibration and noise, and high-speed stability is improved.
Meanwhile, the air hydrostatic bearing with damping changes the mounting mode of the conventional o-shaped ring and is compressed by adopting a fastening structure; the bearing sleeve 10 and the damping sleeve pad 30 are compressed through the fastening structure 3 which is arranged radially, so that the whole aerostatic bearing is integrated, and the high-speed stability of the bearing is improved. The porous restrictor 40 is provided on the inner wall of the bearing housing 10, and the porous restrictor 40 in this embodiment is formed by a porous graphite material in a clearance fit with the bearing housing, and is pressed into a whole by a fastening structure. The porous material has small pores and uniform pore distribution, and the porous graphite material has a self-lubricating effect, and the rotor and the bearing are not seriously damaged by slight collision, so that the porous graphite material is a good throttling element. In the static pressure gas bearing, the porous static pressure gas bearing has the characteristics of good rigidity, small gas consumption, uniform pressure distribution and uniform rigidity distribution. Because of low viscosity coefficient of gas, the damping characteristic is poor, and subsynchronous vibration is easy to generate during high-speed operation.
The fastening structure 3 comprises a screw 31 and an adjustable nut 32 matched with the screw 31; one end of the screw 31 is fastened with the bearing sleeve 10 and is rigidly connected; the other end is adjusted with the adjustable nut 32 in the counterbore 41 of the housing 20.
Specifically, the screw 31 is disposed on the bearing housing 10, and the screw 31 passes through the damping sleeve pad 30 and the bearing housing 10 and the outer housing 20, and is screwed in and out in the counter bore 41 of the outer housing 20 and the through hole 43 of the bearing housing 10. The minute vibration range of the bearing housing 10 can be adjusted by adjusting the nut. When the bearing sleeve 10 and the damping sleeve pad 30 are pressed tightly, the smaller the moving range is, the smaller the damping effect is; meanwhile, the position of the center of the bearing can be finely adjusted by adjusting the position of the nut. The shell 20 is used for guaranteeing the convenience of bearing installation, the nut is adjusted to not influence the installation of the bearing, and compared with the traditional installation mode of the o-shaped ring, the installation mode of the bearing shell is adopted, the difficulty of bearing installation is reduced, and the reliability of the installation is guaranteed.
In order to effectively tighten the travel of the adjustable nut, and after installation, the adjustable nut may be hidden in the counterbore, but interfere with the installation and use of other structures. The adjustable nut 32 will have an outer diameter that is less than the inner diameter of the housing counterbore 41. The damping sleeve gasket 30, the bearing sleeve 10 and the shell 20 are correspondingly provided with an air supply pipe 5, a quick connector 6 is arranged in the air supply pipe 5, the upper end of the quick connector 6 is connected with a hose 51, and the lower end of the quick connector 6 is in butt joint with the bearing sleeve 10; in this embodiment, as an implementation manner of the quick connector 6, a first connection end abutting against the inner wall of the hose 51 is provided at one end of the quick connector 6, and a second connection end plugging into the annular mounting seat 11 of the bearing sleeve 10 is provided at the other end.
And for the safety performance increase, a gas pipe protective sleeve 7 is installed on the outer wall of the gas supply pipe 5, and the gas pipe protective sleeve 7 is connected with the bearing sleeve 10 through gluing. The air supply pipe 5 passes through the damping sleeve gasket 30 and the air supply pipe mounting hole 42 of the bearing housing, so that the air supply pipe 5 is conveniently connected with the air supply pipe mounting hole 42.
The damping sleeve gasket is additionally arranged outside the bearing sleeve, and the bearing sleeve can slightly displace under the action of the damping sleeve gasket by utilizing the damping characteristic of the damping sleeve gasket, so that the damping sleeve gasket plays a damping role.
The damping hydrostatic bearing with damping provided by the utility model has the advantages that the shell is of a multi-layer structure, the damping characteristic of the damping sleeve gasket is effectively utilized, and the resonance amplitude of a mechanical structure between layers of the shell is reduced, so that the structural damage caused by the fact that the dynamic stress reaches the limit is avoided. A damping sleeve gasket is arranged between the bearing sleeve and the shell, so that the bearing can quickly recover to a stable state after being subjected to instantaneous impact when in use.
The above is merely an embodiment of the present utility model, and the present utility model is not limited to the field of the present embodiment, but the specific structure and characteristics of the present utility model are not described in detail. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the present utility model, which should also be considered as the scope of the present utility model, and which does not affect the effect of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (8)
1. The aerostatic bearing with the damping comprises a shell body and an end cover, wherein the shell body is annularly arranged in multiple layers, and the end cover is arranged at the end part of the shell body; the bearing sleeve and the damping sleeve pad are tightly pressed through a fastening structure arranged in the radial direction, so that the whole aerostatic bearing is of an integrated structure, and the high-speed stability of the bearing is improved.
2. The damped hydrostatic bearing of claim 1, wherein said bearing housing inner wall is provided with a porous restrictor in clearance fit with said bearing housing and compressed as a unit by a fastening structure.
3. The damped hydrostatic bearing of claim 2, wherein said porous restrictor is a porous graphite material.
4. The damped hydrostatic bearing of claim 1, wherein said fastening structure comprises a threaded rod and an adjustable nut mated with said threaded rod; one end of the screw rod is fastened with the bearing sleeve and is rigidly connected; the other end and the adjustable nut are adjusted in the counter bore of the shell.
5. The damped hydrostatic bearing of claim 4, wherein said screw is disposed on said bearing housing, said screw passing through said damping sleeve pad and said bearing housing and said housing and being threaded into and out of said housing counterbore and said bearing housing throughbore.
6. The damped hydrostatic bearing of claim 5, wherein said adjustable nut has an outer diameter less than an inner diameter of the counterbore of the housing.
7. The damped hydrostatic bearing of any one of claims 1-6, wherein said damping sleeve gasket and bearing sleeve and housing are provided with air supply conduit mounting holes.
8. The damped hydrostatic bearing of claim 7, wherein said damping sleeve pad is a porous metal material or a high damping alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321143249.9U CN219888506U (en) | 2023-05-12 | 2023-05-12 | Gas hydrostatic bearing with damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321143249.9U CN219888506U (en) | 2023-05-12 | 2023-05-12 | Gas hydrostatic bearing with damping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219888506U true CN219888506U (en) | 2023-10-24 |
Family
ID=88407027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321143249.9U Active CN219888506U (en) | 2023-05-12 | 2023-05-12 | Gas hydrostatic bearing with damping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219888506U (en) |
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2023
- 2023-05-12 CN CN202321143249.9U patent/CN219888506U/en active Active
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