JP2004257441A - Fluid bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid bearing device which is capable of reliably eliminating dust generation attributable to a structure for preventing detachment or side deviation of a shaft, or any wear and seizure caused during the low-speed rotation, and excellent in simplicity and maintainability. <P>SOLUTION: The fluid bearing device in which a shaft 15 of a rotating body 1 is supported by a bearing surface 28 in a non-contact manner with fluid S fed between the bearing surface 28 and the shaft 15 from a fluid feed means 3 has an injection unit 29 for preventing side deviation which is provided facing a side surface 11 across the axis of the rotating body 1 and connected to the fluid feed means 3 so that the fluid S fed from the fluid feed means 3 is injected from the injection unit 29 to keep the distance between a bearing body 2 and the rotating body 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hydrodynamic bearing device for supporting a shaft of a rotating body in a non-contact state by using a fluid pressure, and more particularly to a hydrodynamic bearing device suitable for use in a liquid together with a rotating body.
[0002]
[Prior art]
A fluid bearing device supplies a fluid such as oil or water between a shaft of a rotating body and a bearing surface of a bearing body, and uses a fluid pressure to support the shaft in a non-contact manner. It is used when it is difficult to adopt such. The fluid lubrication system is roughly classified into a dynamic bearing system and a hydrostatic bearing system. The dynamic pressure bearing system has, for example, a structure in which a fluid is drawn into a narrow gap between the bearing surface and the so-called wedge action as the rotating body rotates, and a pressure is generated by a so-called wedge action, and the pressure supports the shaft of the rotating body. It is. The static pressure bearing system has a structure in which, for example, an external fluid supply mechanism supplies a pressurized fluid to a gap between a shaft and a bearing surface and supports the entire circumference of the shaft at a constant pressure (static pressure). These include magnetic bearings. The features of the bearing are that the rotating body shaft is supported in non-contact with the bearing body, so that the rotational wear of the bearing part is small and the seizure phenomenon can be prevented and the generation of dust is small, and the finishing accuracy of the shaft and bearing surface in manufacturing is high. It has advantages such as relaxation, reduction of frictional force and its fluctuation, maintenance of a long life, and no problem of rotational noise.
[0003]
By the way, in the fluid bearing device, the rotating body is likely to be unstable due to the influence of vibration or the like due to the shaft being supported in a non-contact manner. It is difficult to receive the load in the direction. For this reason, for example, in the case of supporting a load in the radial direction, the shaft of the rotating body moves in the horizontal or lateral direction when receiving a load in the thrust direction, and if there is nothing to suppress the movement, it will come off from the bearing body or laterally shift. Occurs. As such a structure for preventing the shaft from slipping out and lateral displacement, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-182287, a mechanical stopper (to prevent the rotor as a rotating body from slipping in the thrust direction). In this case, the rotating body comes into contact with the retaining member, and dust is generated from the contact portion. The benefits are not exploited.
[0004]
In addition, when the shaft is supported by the fluid lubricating film formed with the rotation, the versatility is excellent. At the time of start, stop, and low-speed rotation, boundary lubrication (the shaft contacts the bearing surface) occurs, and a seizure phenomenon occurs. Therefore, it cannot be used for a shaft system that repeats these frequently. As an example of such a measure, there is a supporting device disclosed in the following document 1. In this structure, the shaft is supported by rolling bearings during low-speed rotation, and the shaft is supported by fluid bearings during high-speed rotation, so that it can handle from low-speed rotation to high-speed rotation. Since both bearings are provided, the structure becomes complicated and there are problems in cost and maintenance.
[0005]
[Patent Document 1]
JP-A-5-138407 [Problems to be Solved by the Invention]
In the above-described conventional hydrodynamic bearing device, there is a risk of dust generation due to a mechanical stopper for preventing members from coming into contact with each other or a structure for preventing lateral displacement, and a seizure phenomenon at the time of low-speed rotation and the like, and the application field is limited. Therefore, an object of the present invention is to provide the advantages of the above hydrodynamic bearing device, that is, in addition to the non-abrasion, long life, low noise, the possibility of dust generation due to the above-mentioned retaining and side slip prevention structure, and the low speed rotation. An object of the present invention is to provide a hydrodynamic bearing device that reliably eliminates the risk of abrasion and seizure that occur, and that is excellent in simplicity and maintainability.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention, when specified with reference to the drawings, is configured such that the shaft 15 of the rotating body 1 is supported on the bearing surface 28 of the bearing main body 2, and the bearing surface 28 and the shaft A fluid bearing device which is supported in a non-contact state by a fluid S supplied between the rotating body 1 and the fluid supply means 15 and is provided so as to face a side surface 11 intersecting the axis of the rotating body 1. 3 for ejecting the fluid S supplied from the fluid supply means 3 from the ejecting unit 29, between the bearing body 2 and the rotating body 1. It is characterized by maintaining the distance (adjusting and maintaining the distance almost constant).
[0007]
In the above hydrodynamic bearing device, the distance between the bearing main body and the rotating body is maintained by the fluid ejected from the ejecting unit via the fluid supply means, thereby preventing the shaft from slipping off or laterally shifting, which is likely to occur in the conventional fluid bearing. be able to. Structurally, the fluid supply means also serves to supply the fluid between the bearing surface and the shaft to bring the fluid into a non-contact state (hereinafter, this may be referred to as "floating"). And maintenance is easy because of the fluid type. Operationally, fluid injection, that is, fluid pressure is used instead of mechanical contact between the above members, and there is no fear of wear or dust generation. Here, in the rotating body of the present invention, the “side surface” means a portion that receives a fluid pressure or an injection pressure injected from the side slip prevention injection portion, and is not limited to the side surface 11 in the drawing, and is on the axis of the shaft portion 15. Side surfaces (end surfaces) that intersect with. In the latter case, for example, the bearing body is substantially L-shaped, the L-shaped horizontal piece is used as a bearing surface, and a side-shift preventing injection portion is provided on the L-shaped vertical piece. Therefore, the “fluid receiving portion” in claim 5 is not limited to the side surface 11 in the drawing, but may be the side surface (end surface) of the shaft portion 15.
[0008]
The present invention described above can be developed as in claims 2 to 7. That is,
The second aspect is characterized in that the rotating body 1 is rotated in the fluid S contained in the housing 20 and the fluid supply means 3 takes out the fluid in the housing directly or once out of the housing, and then the injection unit 29. It is a structure to supply to. In this case, since the fluid to be ejected is gas or liquid used in the housing, and since the total amount of fluid in the housing does not decrease, the maintenance cost can be reduced. In addition, there is no risk of impurities mixing into the fluid in the housing as compared with the case where a dedicated fluid is used.
In the third aspect, since the injection portion 29 for preventing lateral displacement is provided in the bearing main body 2, a dedicated member for supporting the injection portion can be unnecessary, and the device structure and the housing can be handled without complication. Excellent in simplicity and simplifies installation.
-Claim 4 has a rotary injection unit 4 connected to the fluid supply unit 3, and the fluid S supplied from the fluid supply unit 3 is supplied from the injection unit 4 to the rotating body 1 or the shaft 15. This is a configuration in which the rotating body 1 is rotated by jetting. In this case, since the floating fluid supply means is used for preventing lateral displacement and rotating, the simplification is achieved and the cost is reduced rationally.
-Claim 5 is a configuration in which the rotation injection unit 4 is provided on the bearing main body 2 and injects fluid toward a fluid receiving unit 17 provided on a side surface 11 of the rotating body 1. In this case, the fluid pressure received from the rotation jetting portion is received by the fluid receiving portion so that the rotating body can be efficiently rotated.
[0009]
According to claim 6, the bearing body 2 forms a bearing 25 attached to a bottom portion in the housing 20 or an installation plate 35 provided in the housing 20, and a bearing surface 28 to form the bearing body 28 And a bearing 27 rotatably mounted. This is because, for example, when the supply of fluid for floating is stopped to stop the rotation of the rotating body, the rotating body lands on the bearing surface by its own weight, but at this time, the shaft deviates from the axis of the bearing surface during the floating and landing process. May not be able to land normally. For this reason, in this structure, the bearing is made rotatable with respect to the holder, and when the shaft lands, even if the shaft is displaced from the axis, the shaft can be reliably received with the rotation of the bearing. Here, “rotatably” includes, for example, a rotation configuration close to swinging such as a pivot bearing.
In claim 7, the bearing main body 2 has a relay pipe portion 37 for connecting the fluid supply pipe portion 33 constituting the fluid supply means 3 to the jetting portions 28a, 29 and the like. Therefore, the simplification of the device, the ease of installation, and the ease of handling can be improved.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
A hydrodynamic bearing device as an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a principle view schematically showing a relationship between a hydrodynamic bearing device and a shaft of a rotating body, and FIG. 2 shows a modification. 3 to 6 show an application example of the hydrodynamic bearing device. FIG. 3 is a schematic diagram showing a cross section of one side of the housing, FIG. 4 is a schematic diagram showing a cross section of the front side of the housing and a part thereof is omitted, and FIG. FIG. 6 is a vertical cross-sectional view of the device shown in FIG. In the following description, reference will be made to the basic structure of the hydrodynamic bearing device, a modified example of FIG. 2, an application example using the device of FIG. 1 based on FIGS. 3 to 6, and an operation based on the application example.
[0011]
(Basic Structure) In the hydrodynamic bearing device of the present invention, referring to FIGS. 1 and 6, the shaft 15 of the rotating body 1 is supported by the bearing body 2, and the fluid supply means 3 and the bearing surface 28 of the bearing body 2 and the shaft 15 The shaft 15 (the rotator 1) is levitated by the fluid S supplied between them and supported in a non-contact manner. In the example of FIG. 1, the bearing body 2 includes a holder 25, a holding member 26 mounted on the holder 25, and a bearing 27 that is rotatably positioned at the center of the holding member 26. The retainer 25 is provided with a hollow pipe portion in the vertical direction, a downstream pipe portion 37 disposed therein, a concave portion for bearing arrangement provided in the upper central portion, and a rotary injection portion 4 provided on one side of the bearing body. have. The downstream pipe section 37 is connected to one of the upstream pipe sections 36 and is connected to the other of the pipe sections 36 and the pipe section 37 a communicating with the concave section which is the lower surface of the bearing 27 provided on the holder 25. And a tube portion 37b extending to substantially the middle of the holder 25 in the vertical direction and further communicating with the liquid discharging portion 4. As shown in FIG. 5, the injection unit 4 is provided with a substantially L-shaped upward nozzle 4a or formed as a hole inclined upward. These are slightly displaced from the hole line of the lateral displacement prevention injection unit 29 described later.
[0012]
The holding member 26 is fixed to the upper surface of the holder 25. A through hole for a bearing and a large-diameter hole whose diameter is slightly larger on the lower side of the through hole are provided at the center. On the upper surface, a pair of regulating rods 26a that keep a gap larger than the outer diameter of the shaft 15 is provided. Each restriction bar 26a restricts the movement of the shaft 15 when the shaft 15 on the bearing 27 attempts to move largely horizontally or horizontally. The bearing 27 has a cylindrical shape and has a concave arc-shaped bearing surface 28 formed on the upper surface, a flange portion 27 a formed around the fitting surface and fitted to the large-diameter hole of the holding member 26, and a lower surface formed on the lower surface. A conical hollow portion 27b for receiving the fluid S introduced from the pipe portion 37a of the downstream pipe portion 37, an injection portion 29 for preventing lateral displacement that penetrates substantially horizontally from the hollow portion 27b to one side of the bearing body; A floating injection part 28a, which is a large number of through-holes provided in the vertical direction, is provided integrally between the surface 28 and the hollow part 27b. As shown in FIG. 4, a nozzle 29a is attached to the ejection unit 29 as needed.
[0013]
After the lower side of the bearing 27 is fitted and arranged in the concave portion of the holder 25, the holding member 26 is fixed on the holder 25 (not shown in FIGS. 1 and 2, but the screw shown in FIG. 5). 26b). Then, the bearing 27 is assembled to the holder 25 in a state where the position of the flange 27a is restricted to the large-diameter hole of the holding member 26, and the hydrodynamic bearing device of the present invention is obtained. On the other hand, the fluid supply means 3 is designed according to use conditions as described in an application example. In short, it is only necessary that the fluid can be supplied to the injection unit 4, the injection unit 29, and the injection unit 28a through the piping units 33, 36, 37, and the like at the designed pressure and flow rate through a pump or the like. Further, the fluid may be a gas such as an inert gas or a reaction gas, or a liquid such as an oil or a chemical solution. In the above hydrodynamic bearing device, the fluid supplied from the fluid supply means 3 is pressure-fed and ejected to the ejection unit 4, the ejection unit 29, and the ejection unit 28a, respectively. Of these, the ejection unit 28a ejects a fluid toward the outer periphery of the shaft 15, and the shaft 15 is floated from the bearing surface 28 by the fluid pressure to make a non-contact state. The ejection unit 4 ejects a fluid toward (the fluid receiving unit 17 provided on) the side surface 11 of the rotating body 1 and rotates the rotating body 1 in one direction by the fluid pressure. The ejection unit 29 ejects a fluid toward the side surface 11 of the rotating body 1 so that the distance between the bearing main body 2 and the rotating body 1 does not approach carelessly due to the fluid pressure. The point is a structure for preventing the shaft from coming off or laterally shifting, which is likely to occur in the fluid bearing system. This has the advantage that it is simple, can be implemented with minimal expense, and can be easily maintained because it is fluid.
[0014]
(Modification) The hydrodynamic bearing device shown in FIG. 2 is different from the device shown in FIG. 1 in that the number of members is reduced by first omitting the above-described holding member 26 and fixing the bearing 27A to the holder 25A. Simplified. In addition, the bearing 27A has a regulating surface 26d that extends upward continuously with the concave arc shape of the bearing surface 28 because the pressing member 26 is omitted. The shape of the bearing surface 28 is designed in consideration of the floating efficiency of the shaft 15, and the shape of the regulating surface 26d is designed to be slightly larger than the outer diameter of the shaft 15 and in consideration of the floating height of the shaft 15. As described above, the hydrodynamic bearing device of the present invention can be changed as necessary. For example, a nozzle may be attached to a hole as the levitation injection unit 28a in the same manner as the injection units 4 and 29, or the angle of the nozzle may be changed. The position and the like are also arbitrarily designed. In addition, the pipe portion 37 of the bearing main body 2 may be configured by the through hole itself formed in the bearing main body, that is, may not be the dedicated pipes 37a and 37b.
[0015]
(Application Example) Here, in order to clarify the mode of using the hydrodynamic bearing device of FIG. 1 described above, that is, the usefulness when actually implemented as a bearing element of a rotating body, a hydraulic machine, a processing vessel, and the like are configured. An example will be described in which the rotating body 1 is supported in oil. In this example, the rotating body 1 has shaft portions 15 on both sides and is supported by a bearing assembly 5 that is provided in a housing 20 and is a unit of the bearing main body 2. It floats and rotates while being immersed in S.
[0016]
Among these, the rotating body 1 has a substantially cylindrical shape whose periphery 10 is capable of taking in and out devices and solutions and the like, and is provided on both side surfaces 11 and protrudes outside the center of the end face. The same) 15 and fluid receiving portions 17 provided on the outer end surfaces of both side surfaces 11. The fluid receiving portion 17 is entirely designed in a water wheel shape, is provided concentrically with the shaft 15 with respect to the outer end surface, and has a plurality of blades 18 on the outer periphery of the trunk portion which is considerably larger in diameter than the shaft 15. I have. Each of the blades 18 has a long gear shape as a whole. The point is that the blade 18 may have any shape so that when the blade 18 receives a fluid pressure from the outside, the blade 18 can easily receive the fluid pressure. The shaft portion 15 of the rotating body 1 is formed to have a length protruding outside the bearing surface 28 of the bearing body 2 so that the rotating body 1 can be set or moved by the automatic carrier, so that the rotating body 1 can be gripped by a robot hand. ing.
[0017]
The housing 20 is divided by a peripheral side wall 20a and a bottom wall 20b, and has a size such that the rotating body 1 is set with a margin with respect to a bearing assembly 5 installed therein. In this example, the upper opening is opened and closed by the lid 21 as necessary, and the fluid supply means 3 is configured as a path for circulating the oil S in the housing 20. The circulation path includes a processing unit 30, a hydraulic pressure pump 31, a valve device 32, and the like, which are connected by a piping unit 33 connected to the joint 22 on the housing 20 side. The processing unit 30 performs, for example, heating and / or filtration on the oil S taken out of the housing 20. Of course, structurally, the processing unit 30 is used to introduce oil S into the housing 20 from external equipment, or to connect a piping unit extending to the bottom 20b inside the joint 22 instead of a discharge unit (not shown). The oil S in the housing 20 may be exchangeable. The valve device 32 is interposed between the pump 31 and the bearing assembly 5 and includes a three-way valve and a control unit for adjusting the distribution flow rate thereof, although details are omitted. Thus, the fluid supply means 3 constitutes the hydrodynamic bearing device of the present invention, and also has a function of controlling the oil S in the housing 20. Then, the oil S in the housing 20 is taken out from the upstream pipe 33a and provided on the bottom wall 20b of the housing 20 and the two pipes 33c branched from the processing unit 30 and the pump 31 and the pipe 33b from the valve device 32. Through the bearing assembly 5, the fuel is returned into the housing 20 from each of the injection parts 4, 29 and 28 a described above. In terms of structure, the fluid supply means 3 may be configured exclusively for the hydrodynamic bearing device, or a necessary part such as the pump 31 may be built in the housing 20 and externally controlled.
[0018]
The bearing assembly 5 is formed into a unit corresponding to the rotating body 1 described above, and the bearing main body 2 is provided on a mounting plate 35 as a pair so that the shafts 15 on both sides can be supported. As shown in FIGS. 5 and 6, details of the mounting plate 35, the bearing body 2 mounted on the left and right sides of the mounting plate 35, a pipe portion 36 provided inside the mounting plate 35 and connected to the pipe 33c, A downstream piping section 37 is provided in each bearing body 2 and connected to the corresponding piping section 36. The installation plate 35 has a rectangular plate shape, and has a hollow piping portion, in which each piping portion 36 is disposed. The installation plate 35 is provided with a mounting hole corresponding to the bearing body 2 on both sides, a communication hole for communicating the pipe portion 36 to the bearing body 2 side, a mounting hole 35a for fixing the bottom wall 20b of the housing 20 with a screw or the like. ing. Reference numeral 34 in FIG. 5 denotes a joint that connects the pipe sections 36 corresponding to the pipes 33c. The joint 34 is schematically illustrated, but may be attached to, for example, a side surface or a bottom surface of the installation plate 35.
[0019]
(Operation) In the above structure, after the oil S in the housing 20 is appropriately processed in the processing unit 30, the oil is branched in two directions by the valve device 32 from the pump 31 through the pipe 33b, and the installation plate 35 is connected to each pipe 33c. At a designed flow rate and hydraulic pressure to two pipe sections 36 piped in the pipe. Then, after the oil S is pressure-fed from one of the pipe portions 36 to the pipe portion 37a of the holder 25 and the hollow portion 27b of the bearing 27, a part of the oil S is jetted upward from the jetting portion 28a, and a portion is jetted out of the jetting portion 29. (Nozzle 29a) is injected in a substantially horizontal direction. At the same time, the oil S is injected obliquely upward from the injection part 4 (nozzle 4a) from the pipe part 37b of the holder 25 from the other pipe part 36. In the above structure, all the oil S taken out of the housing 20 is injected from the injection units 28a, 29, and 4. However, depending on the design used, the excess liquid portion of the oil S taken out of the housing 20 is directly returned to the housing 20.
[0020]
As the fluid bearing structure, when the rotating body 1 is held by the bearing bodies 2 on both sides, a force for pushing up the shaft 15 onto the bearing surface 28 by the jet flow or liquid pressure of the oil S injected from the injection portion 28a. Act as The rotating body 1 floats from the bearing surface 28 of the bearing body 2 and is brought into a non-contact state, so that there is no contact force with the bearing surface 28. This is a floating mode belonging to the hydrostatic bearing system, and when the rotating body 1 is rotated, the frictional force with respect to the bearing surface 28 is lost and the risk of generation of impurities easily generated in the shaft holding portion can be eliminated. At the same time, the rotating body 1 starts rotating by a jet flow or a liquid pressure which is jetted from the (nozzle 4 a) of the jetting unit 4 toward the corresponding blade 18 of the fluid receiving unit 17. Since the rotation of the rotator 1 is in a floating state, the rotator 1 is rotated even by a weak force as the injection force of the injection unit 4, and the rotation speed is also variable by controlling the injection force. This is an advantage of the hydrodynamic bearing. In this structure, the rotary power source can be performed by the existing pump 31, and there is no risk of impurity contamination as compared with the mechanical type. When replacing the rotating body 1, for example, the passage to the pipe portion 37a via the valve device 32 is closed to stop the injection from the injection unit 4 or the like. Then, the rotating body 1 lands on the bearing surface 28 by its own weight. In this structure, since the bearing 27 is rotatable with respect to the holder 25 and the holding member 26, when the rotating body 1 lands after floating, the bearing 27 changes its direction as necessary to move the corresponding shaft 15 to the bearing surface. At 28, it can be reliably received. At the same time, in this structure, in the above-described floating and rotating process of the rotating body 1, the rotating body 1 is caused by the jet flow or the liquid pressure of the oil S injected from each of the injection portions 29 (nozzles 29 a) of the dual-bearing main body 2. Centering adjustment is performed between the two bearing bodies 2. This is because, for example, when the rotating body 1 moves horizontally or in the axial direction of the shaft 15 in a floating state, the side surface 11 (the fluid receiving portion 17 in this example) of the rotating body 1 may collide with the corresponding bearing body 6, There is a possibility that impurities may be generated due to this. However, in this structure, all such fears can be eliminated by the above-described centering adjustment by the fluid pressure instead of the conventional structure for preventing slippage or lateral displacement.
[0021]
Note that the present invention is not limited at all by the above-described embodiment. The hydrodynamic bearing device of the present invention only needs to satisfy the requirements specified in claim 1, and can be changed as necessary with reference to the above embodiment. For example, the material of each member is appropriately selected according to the target fluid, the constituent members and the shape of the bearing main body are changed, and the rotating body may be anything.
[0022]
【The invention's effect】
As described above, the hydrodynamic bearing device of the present invention has the risk of dust generation due to the retaining and side-slip prevention structures mentioned above without impairing the advantages of the hydrodynamic bearing, and the seizure during low-speed rotation and stoppage. The phenomenon and the danger of dust generation due to the phenomenon can be surely eliminated, and a component having few constituent members and having excellent simplicity, low cost, and excellent maintainability can be provided. Accordingly, the present invention expands the application opportunities and application fields of the fluid bearing, for example, when a rotating body constituting a hydraulic machine or the like is continuously supported in a liquid for a long time, various reactions and dispersions are performed at a temperature. This is useful when, for example, supporting a rotating body performed in a stable liquid.
[Brief description of the drawings]
FIG. 1 is a principle diagram showing a relationship between a hydrodynamic bearing device of the present invention and a shaft.
FIG. 2 is a diagram showing an example in which the device of FIG. 1 is modified.
FIG. 3 is a schematic sectional view showing an application example of the hydrodynamic bearing device.
FIG. 4 is a schematic sectional view in the application example.
FIG. 5 is a schematic external view showing an assembly of a bearing main body in the application example.
FIG. 6 is a schematic longitudinal sectional view showing a main part of the assembly of FIG. 4;
[Explanation of symbols]
1. Rotating body (15 is a shaft, 17 is a fluid receiving part, 18 is a blade)
2 ... Bearing body (25 is a holder, 27 is a bearing)
3. Fluid supply means (31 is a pump, 32 is a valve device, 33 and 37 are piping sections)
4 Housing 7 Floating injection unit (fluid supply means)
8: Side-shift prevention injection unit (fluid supply means)
9 ... Rotating injection unit (fluid supply means)
33a, 33b, 33c: Piping 37a, 37b: Piping S: Oil (fluid)

Claims (7)

A fluid bearing device in which a shaft of a rotating body is supported by a bearing surface of a bearing body and is supported in a non-contact state by a fluid supplied between the bearing surface and the shaft from a fluid supply unit.
A side-shift preventing ejection unit provided opposite to a side surface intersecting on the axis of the rotating body and connected to the fluid supply unit, and supplying a fluid supplied from the fluid supply unit from the ejection unit. A fluid bearing device, which injects and maintains a distance between the bearing main body and the rotating body. 2. The fluid bearing according to claim 1, wherein the rotating body is rotated in a fluid accommodated in a housing, and the fluid supply unit supplies the fluid in the housing to the ejection unit directly or once after taking the fluid out of the housing. 3. apparatus. 3. The hydrodynamic bearing device according to claim 1, wherein the lateral displacement prevention injection unit is provided on the bearing main body. 4. 2. The apparatus according to claim 1, further comprising: a rotating ejection unit connected to the fluid supply unit, wherein the fluid supplied from the fluid supply unit is ejected from the ejection unit to the rotating body or the shaft to rotate the rotating body. 3. 4. The hydrodynamic bearing device according to any one of the above items 3. The fluid bearing device according to claim 4, wherein the rotation ejection unit is provided on the bearing main body, and ejects the fluid toward a fluid receiving unit protruding from a side surface of the rotating body. The said bearing main body consists of the holding | maintenance attached to the bottom part in the said housing or the installation board provided in the said housing, and the bearing which forms a bearing surface and is rotatably attached with respect to the said holding | maintenance. 6. The hydrodynamic bearing device according to any one of 2 to 5. The fluid bearing according to any one of claims 1 to 6, wherein the bearing main body includes a relay piping portion that connects the fluid supply piping portion and the injection portion or the like that constitute the fluid supply unit. apparatus.

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