Bearing device

Abstract

To provide technique capable of suppressing adverse effect caused by a preload of a tilting pad.SOLUTION: A bearing device 30 according to an embodiment includes a tilting pad 32A which faces a rotating shaft, a pivot 32B which supports the tilting pad 32A from the radial outer side with respect to a rotation axis AX of the rotating shaft 20, an elastic body 32C which energizes the pivot 32B toward the radial inner side, and a regulating portion 31C which regulates movement of the pivot 32B to the radial inner side so that a gap is formed between the tilting pad 32A and the rotating shaft 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a bearing device and the like. [Background technology]

[0002] BACKGROUND ART A tilting pad type bearing is known in the art (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-140876 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, a preload may be applied by an elastic part that presses the tilting pad against the rotating shaft via a support part that supports the tilting pad from the radial outside of the axis of the rotating shaft, which can suppress vibration during high-speed rotation.

[0005] However, when a preload is set, for example, contact between the tilting pad and the rotating shaft when the rotating shaft starts to rotate may result in frictional resistance loss between the tilting pad and the rotating shaft, or may accelerate wear and damage to the tilting pad.

[0006] In view of the above problem, an object of the present invention is to provide a technology that can suppress the adverse effects of the preload on the tilting pad. [Means for solving the problem]

[0007] In order to achieve the above object, in one embodiment of the present disclosure, a tilting pad facing the rotation axis; a support portion that supports the tilting pad from the outside in a radial direction based on the axis of the rotation shaft; an elastic portion that biases the support portion toward the inside in the radial direction; a restricting portion that restricts movement of the support portion toward the inside in the radial direction so as to generate a gap between the tilting pad and the rotation shaft, A bearing arrangement is provided. [Effects of the Invention]

[0008] According to the above-described embodiment, the adverse effects of the preload on the tilting pad can be suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a side view showing the structure of an example of an expansion turbine. [Figure 2] 1 is a cross-sectional view showing the structure of an example of an expansion turbine. [Figure 3] FIG. 4 is a cross-sectional view showing an example of the structure of a restricting portion. [Figure 4] FIG. 1 is a diagram illustrating an example of a hydrogen gas filling system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings.

[0011] [Expansion turbine structure] The structure of an expansion turbine 1 according to this embodiment will be described with reference to FIGS.

[0012] Fig. 1 is a side view showing the structure of an example of an expansion turbine 1. Fig. 2 is a cross-sectional view showing the structure of an example of an expansion turbine 1.

[0013] 1, the housing 31 is drawn as a vertical cross section in order to clearly show the main components of the expansion turbine 1. Hereinafter, in this specification, the axial direction, radial direction, and circumferential direction based on the rotation axis AX of the expansion turbine 1 may be simply referred to as the "axial direction," the "radial direction," and the "circumferential direction" unless otherwise specified. In addition, in FIG. 2, the rotation shaft 20 rotates clockwise.

[0014] As shown in FIG. 1, the expansion turbine 1 includes a rotating shaft 20, a bearing device 30, an impeller 40, and an energy consuming section 50.

[0015] The rotary shaft 20 is disposed so that its axis coincides with the rotary axis AX of the expansion turbine 1 .

[0016] An impeller 40 for expanding a process gas is attached to one end (the lower end in this example) of the rotating shaft 20. The process gas is, for example, hydrogen gas. Alternatively, the process gas may be helium gas, nitrogen gas, or air.

[0017] An energy consuming unit 50 is attached to the other end (the upper end in this example) of the rotating shaft 20. The energy consuming unit 50 can consume the rotational energy of the rotating shaft 20 driven by the process gas. The energy consuming unit 50 is, for example, an impeller of a compressor 410 (see FIG. 5) described below. The energy consuming unit 50 may also be a brake fan for braking or a generator.

[0018] The bearing device 30 supports the radial load and thrust load on the rotating shaft 20 rotating at high speed.

[0019] The bearing device 30 includes a housing 31, a radial bearing 32, a collar 33, and a thrust bearing 34.

[0020] The housing 31 supports a radial bearing 32 and a thrust bearing 34 .

[0021] In this example, the rotating shaft 20 passes through the housing 31 in the vertical direction. Also, as described above, the rotation axis AX of the expansion turbine 1 may be arranged along the horizontal direction, in which case the rotating shaft 20 passes through the housing 31 in the horizontal direction. The impeller 40 is attached to one end (in this example, the lower end) of the rotating shaft 20 that is exposed from one end (in this example, the lower end) of the housing 31, and the energy consuming unit 50 is attached to the other end (in this example, the upper end) of the rotating shaft 20 that is exposed from the other end (in this example, the upper end) of the housing 31.

[0022] The radial bearing 32 supports a radial load on the rotating shaft 20. For example, as shown in Fig. 1, the radial bearing 32 is a tilting pad type radial bearing.

[0023] In this example, two radial bearings 32 are provided, one at each end in the axial direction inside the housing 31.

[0024] The radial bearing 32 includes a tilting pad 32A, a pivot 32B, an elastic body 32C, and an adjustment portion 32D.

[0025] The tilting pad 32A is disposed so as to face the rotating shaft 20 in the radial space between the rotating shaft 20 and the housing 31. A plurality of tilting pads 32A (three in this example) are disposed in the circumferential direction. For example, the tilting pads 32A are disposed at angular positions set at approximately equal intervals in the circumferential direction. The inner peripheral surface 32A1 of the tilting pad 32A facing the rotating shaft 20 is formed into an arc-shaped curved surface that follows the outer shape of the rotating shaft 20 when viewed along the axial direction, for example. The outer peripheral surface 32A2 of the tilting pad 32A that abuts against the pivot 32B is formed into a curved surface, for example, a spherical surface. The inner peripheral surface 32A1 and the outer peripheral surface 32A2 of the tilting pad 32A are, for example, coated with a special coating to increase hardness.

[0026] The pivot 32B is disposed so as to abut against the radial outside of the tilting pad 32A (specifically, the outer peripheral surface 32A2). One pivot 32B is provided for each tilting pad 32A. That is, the same number of pivots 32B as the number of tilting pads 32A (three in this example) are provided, and the multiple pivots 32B are disposed at circumferential positions (angular positions) where they can abut against the outer peripheral surface 32A2 of the corresponding tilting pad 32A. The contact portion of the pivot 32B with the tilting pad 32A is formed into a curved surface, such as a spherical surface. This allows the tilting pad 32A, which has the curved outer peripheral surface 32A2, to move freely while abutting against the pivot 32B. The contact portion of the pivot 32B with the tilting pad 32A is, for example, coated with a special coating to increase hardness.

[0027] When the rotating shaft 20 is stationary, the outer peripheral surface 32A2 of the tilting pad 32A and the pivot 32B are in surface contact. This is because the pivot 32B is pressed against the tilting pad 32A from the radially outer side by the action of the elastic body 32C described below. Also, the tilting pad 32A is pressed against the rotating shaft 20 from the radially outer side via the pivot 32B by the action of the elastic body 32C, and the rotating shaft 20 presses the other tilting pads 32A against the pivot 32B. On the other hand, when the rotational speed of the rotating shaft 20 increases to a certain extent, a gas film is formed between the outer peripheral surface 32A2 of the tilting pad 32A and the pivot 32B by lubricating gas (hereinafter referred to as "bearing gas" for convenience) supplied into the housing 31 through the injection holes 34A. As a result, when the rotation speed of the rotary shaft 20 is relatively high, the outer circumferential surface of the tilting pad 32A and the pivot 32B are in a non-contact state.

[0028] The elastic body 32C abuts against the radially outer side of the pivot 32B and generates a biasing force for pressing the tilting pad 32A toward the rotation shaft 20 via the pivot 32B. The elastic body 32C is, for example, a coil spring, and is also referred to as a "preload spring." For example, as shown in FIG. 2, the elastic body 32C may be provided for only some of the pivots 32B (in this example, three pivots 32B) among the multiple pivots 32B. Alternatively, the elastic body 32C may be provided for each pivot 32B. That is, the same number of elastic bodies 32C as the number of pivots 32B (in this example, three) may be provided.

[0029] The pivot 32B, or a combination of the pivot 32B and the elastic body 32C, is disposed in a radially extending through-hole provided in the housing 31. The housing 31 is provided with the same number of through-holes as the pivots 32B (three in this example), and the multiple through-holes are formed at circumferential positions corresponding to the angular positions at which the multiple tilting pads 32A are disposed.

[0030] The housing 31 is provided with a restricting portion 31C that restricts radially inward movement of the pivot 32B biased by the elastic body 32C. Specifically, the restricting portion 31C defines the radially inner limit to which the pivot 32B can move due to the biasing force of the elastic body 32C, and when the pivot 32B abuts against the restricting portion 31C from the radially outer side, it cannot move radially inward beyond that position. The details of the restricting portion 31C will be described later.

[0031] The adjustment unit 32D is disposed so as to abut against the radially outer side of the elastic body 32C. An adjustment unit 32D is provided for each combination of pivot 32B and elastic body 32C. That is, the same number of adjustment units 32D (one in this example) as the number of pivots 32B and elastic bodies 32C are provided. The adjustment unit 32D is attached to the housing 31 so as to be able to adjust the radially outer end position of the elastic body 32C. This makes it possible to adjust the expansion / contraction state of the elastic body 32C and adjust the biasing force with which the elastic body 32C presses the tilting pad 32A against the rotation shaft 20 via the pivot 32B.

[0032] For example, the adjustment portion 32D is a male screw member that can be screwed from the outside in the radial direction into a female screw portion that is formed on the radial inner surface of a through hole that houses the pivot 32B and the elastic body 32C in the housing 31. This makes it possible to adjust the radial outer end position of the elastic body 32C by adjusting the amount of screwing of the male screw member that serves as the adjustment portion 32D.

[0033] The collar 33 is attached to the rotary shaft 20 and has a disk shape centered on the rotary shaft 20. The collar 33 is provided inside the housing 31 at the center in the axial direction.

[0034] The collar 33 is configured to be able to receive a reaction force (hereinafter referred to as a "thrust reaction force") generated by the thrust bearing 34 in response to the thrust load of the rotary shaft 20.

[0035] The thrust bearing 34 supports a thrust load on the rotary shaft 20. Specifically, the thrust bearing 34 generates a thrust reaction force on the collar 33.

[0036] The thrust bearing 34 is disposed so as to face the collar 33 in the axial direction. For example, as shown in Fig. 1, two thrust bearings 34 are provided, and each is disposed so as to be adjacent to both one end (in this example, the lower end) and the other end (in this example, the upper end) of the rotating shaft 20 when viewed from the collar 33.

[0037] For example, as shown in FIG. 1 , the thrust bearing 34 is a hydrostatic gas bearing. Specifically, the thrust bearing 34 has injection holes 34A that inject bearing gas toward the collar 33. For example, the injection holes 34A are provided at predetermined intervals in the circumferential direction. The injection holes 34A are provided in the housing 31 and communicate with a gas supply path 31A that connects to the outside of the expansion turbine 1, and lubricating gas (bearing gas) is supplied to the injection holes 34A from the outside of the expansion turbine 1. The bearing gas is, for example, the same type of gas as the process gas introduced into the expansion turbine 1 (specifically, the impeller 40). In this case, as described below, the process gas before being introduced into the expansion turbine 1 is branched and supplied to the thrust bearing 34. Alternatively, the bearing gas may be a type of gas dedicated to the bearing device 30 that is different from the process gas introduced into the expansion turbine 1.

[0038] The injected bearing gas is discharged to the outside of the expansion turbine 1 through a through-hole 31B provided at a location radially outward from the collar 33 in the housing 31. For example, the bearing gas discharged through the through-hole 31B is released into the atmosphere. Furthermore, if the bearing gas is the same type of gas as the process gas, the bearing gas discharged through the through-hole 31B may be reused by being returned to the path of the process gas before being introduced into the expansion turbine 1.

[0039] The injection holes 34A are provided on the surface of the thrust bearing 34 facing the collar 33, and are formed so that the injection direction of the bearing gas is in the axial direction. This allows the bearing gas injected from the injection holes 34A to generate a thrust reaction force in the collar 33. Furthermore, even if the rotating shaft 20 tilts due to runout or vibration of the rotating shaft 20, causing the collar 33 to approach the thrust bearing 34, the action of the injected bearing gas can suppress abnormal approach due to an increase in the tilt of the rotating shaft 20. As a result, contact between the collar 33 and the thrust bearing 34 can be suppressed.

[0040] 1, the thrust bearing 34 may be a dynamic pressure gas bearing that supports the thrust load of the rotating shaft 20 by gas film pressure between it and the collar 33. In this case, the injection holes 34A are omitted. The thrust bearing 34 may also be a combination of both the dynamic pressure type and the static pressure type.

[0041] [Structure of the restrictor] Next, an example of the structure of the restricting portion 31C according to this embodiment will be described with reference to FIG. 3 in addition to FIGS.

[0042] FIG. 3 is a diagram showing an example of the structure of the restricting portion 31C.

[0043] 1 to 3, the restricting portion 31C is provided so as to protrude from the inner surface of a through-hole in the housing 31, in which the combination of the pivot 32B and the elastic body 32C is disposed. Specifically, at the circumferential position where the combination of the pivot 32B and the elastic body 32C is disposed, the through-hole is provided so as to extend in the radial direction, and the restricting portion 31C is formed as a convex portion that protrudes from the inner surface of the through-hole toward the pivot 32B in a direction perpendicular to the radial direction. The restricting portion 31C includes a surface 31Ca and a surface 31Cb.

[0044] The surface 31Ca corresponds to a side surface of the protrusion. The surface 31Ca is a surface perpendicular to the radial direction at a circumferential position where the combination of the pivot 32B and the elastic body 32C is disposed, and is disposed so as to face the surface 32Ba of the pivot 32B, which is located radially outward. The restricting portion 31C restricts the pivot 32B from moving further radially inward by abutting, specifically, by surface contact, the surface 31Ca with the surface 32Ba of the pivot 32B. For example, the surface 31Ca is provided so that the tilting pad 32A does not come into contact with the rotating shaft 20 at the position where it comes into contact with the surface 32Ba of the pivot 32B. This allows the tilting pad 32A and the rotating shaft 20 to be kept out of contact, for example, when the expansion turbine 1 stops rotating. Therefore, the restricting portion 31C can suppress friction loss caused by contact between the tilting pad and the rotating shaft 20 when the rotating shaft 20 of the expansion turbine 1 starts rotating, for example. Furthermore, the regulating unit 31C can suppress a situation in which, for example, when the rotating shaft 20 of the expansion turbine 1 starts to rotate or when it decelerates and stops, the rotating shaft 20 and the tilting pad 32A come into contact with each other, accelerating wear and damage to the tilting pad 32A due to friction. Furthermore, the regulating unit 31C can suppress a situation in which, for example, when the rotating shaft 20 accelerates after the expansion turbine 1 starts to rotate and the rotating shaft 20 and the tilting pad 32A transition from a contact state to a non-contact state, the rotating shaft 20, released from friction, suddenly accelerates. As a result, the regulating unit 31C can suppress a situation in which excessive vibration occurs or excessive rotation or overspeeding exceeding the design rotation speed occurs due to sudden acceleration.

[0045] The surface 31Cb corresponds to the tip surface of the protrusion. The surface 31Cb faces the surface 32Ba of the pivot 32B in a direction perpendicular to the radial direction at a circumferential position where the combination of the pivot 32B and the elastic body 32C is disposed. The surface 31Cb is provided to have a gap GP with the surface 32Ba. This prevents the surface 31Cb of the restricting portion 31C and the surface 32Bb of the pivot 32B from coming into contact and sliding with each other when the pivot 32B moves without the surface 32Ba of the pivot 32B abutting the surface 31Ca of the restricting portion 31C. Therefore, the restricting portion 31C prevents a situation in which the movement of the pivot 32B is hindered and friction loss occurs when the surface 32Ba of the pivot 32B abuts the surface 31Ca of the restricting portion 31C.

[0046] In this way, in this example, when the surface 31Ca abuts against the surface 32Ba of the pivot 32B, the restricting portion 31C can restrict the radially inward movement of the pivot 32B. Therefore, by appropriately setting the surfaces 31Ca and 32Ba, it is possible to suppress contact between the tilting pad 32A and the rotating shaft 20.

[0047] In this example, the restricting portion 31C is provided so that other portions (for example, the surface 31Cb) do not come into contact with the pivot 32B when the surface 31Ca is not in contact with the surface 32Ba of the pivot 32B. This makes it possible to prevent the restricting portion 31C from interfering with the movement of the pivot 32B.

[0048] [Example of expansion turbine application] Next, an application example of the expansion turbine 1 according to this embodiment will be described with reference to FIG.

[0049] FIG. 4 is a diagram showing an example of a hydrogen gas filling system SYS.

[0050] The hydrogen gas filling system SYS is installed, for example, in a hydrogen station for filling a vehicle VCL with hydrogen gas.

[0051] As shown in FIG. 4, the hydrogen gas filling system SYS includes a hydrogen gas compression facility 100, an expansion valve 200, a hydrogen gas line 300, a pre-cooling system 400, and a dispenser 500.

[0052] The hydrogen gas compression equipment 100 compresses hydrogen gas supplied from a tank as a process gas, boosts the pressure to a predetermined level, and outputs the compressed hydrogen gas.

[0053] The expansion valve 200 adiabatically expands (isenthalpic expands) the hydrogen gas output from the hydrogen gas compression equipment 100. At this time, since the temperature of the hydrogen gas before expansion is higher than the inversion temperature (-58°C), the temperature of the hydrogen gas after expansion rises due to the Joule-Thomson effect.

[0054] The hydrogen gas line 300 supplies the expanded hydrogen gas output from the expansion valve 200 to the pre-cooling system 400 .

[0055] The pre-cooling system 400 cools the hydrogen gas supplied from the hydrogen gas line 300 and supplies it to the dispenser 500 .

[0056] The pre-cooling system 400 includes a compressor 410 , a chiller 420 , a cold source 430 , and an expansion section 440 .

[0057] The compressor 410 compresses the hydrogen gas supplied from the hydrogen gas line 300 .

[0058] The cooler 420 exchanges heat between a refrigerant supplied from a cold heat source 430 and the hydrogen gas compressed by the compressor 410, thereby cooling the hydrogen gas.

[0059] The cold heat source 430 supplies a refrigerant having a temperature lower than that of the hydrogen gas output from the compressor 410 to the cooler 420 and circulates it.

[0060] A cooler similar to the cooler 420 may be provided upstream of the compressor 410, and the hydrogen gas in the hydrogen gas line 300 may be introduced into the compressor 410 after being cooled by the cooler.

[0061] The expansion section 440 expands the hydrogen gas cooled by the cooler 420. This allows the hydrogen gas to expand and lower its temperature. Furthermore, by expanding the hydrogen gas compressed by the compressor 410, the expansion ratio becomes relatively large, and as a result, the temperature of the hydrogen gas can be lowered more significantly. Therefore, the temperature of the hydrogen gas can be lowered to an appropriate level without requiring a pre-cooling system that requires a refrigerator equipment including, for example, a compressor, a condenser, an expansion valve, an evaporator, an accumulator, and the like.

[0062] In this example, the compressor 410 and the expansion section 440 are realized by the expansion turbine 1. Specifically, the expansion turbine 1 realizes the function of the expansion section 440 by expanding hydrogen gas with the impeller 40 at one end of the rotary shaft 20, and realizes the function of the compressor 410 by compressing the hydrogen gas with the impeller serving as the energy consumption section 50 at the other end of the rotary shaft 20.

[0063] The dispenser 500 fills the hydrogen tank TNK of the vehicle VCL with high-pressure hydrogen gas supplied from the pre-cooling system 400. The vehicle VCL is, for example, a fuel cell vehicle equipped with a fuel cell capable of generating electricity using hydrogen gas as fuel.

[0064] In this way, the expansion turbine 1 can be applied to the pre-cooling system 400 of the hydrogen gas filling system SYS.

[0065] [Other embodiments] Next, another embodiment will be described.

[0066] The above-described embodiment may be modified or changed as appropriate.

[0067] For example, in the above-described embodiment, the restricting portion 31C is not limited to the above-described embodiment. For example, the restricting portion 31C may be formed as a recess having surfaces 31Ca and 31Cb, and the pivot 32B may be formed as a protrusion having surfaces 32Ba and 32Bb.

[0068] Furthermore, in the above-described embodiment and its modified and altered examples, the bearing device 30, particularly the radial bearing 32, may be applied to other rotary machines other than the expansion turbine 1. Examples of other rotary machines include jet engines, gas turbines, superchargers, compressors, pumps, and water turbines.

[0069] In the above-described embodiment and its variations and modifications, the radial bearing 32 may use a liquid such as oil as a lubricant instead of a gas (bearing gas).

[0070] [Effect] Next, the operation of the bearing device according to this embodiment will be described.

[0071] For example, a preload may be applied by an elastic part that presses the tilting pad against the rotating shaft via a support part that supports the tilting pad from the outside in the radial direction based on the axis of the rotating shaft, thereby suppressing vibration during high-speed rotation.

[0072] However, when a preload is applied, for example, friction loss may occur due to contact between the tilting pad and the rotating shaft when the rotating shaft starts to rotate. Furthermore, when a preload is applied, the rotating shaft and the tilting pad come into contact when the rotating shaft starts to rotate or when it decelerates and stops, which may accelerate wear and damage to the tilting pad due to friction. Furthermore, when a preload is applied, the rotating shaft accelerates from the start of rotation, and when the rotating shaft and the tilting pad transition from a contact state to a non-contact state, the rotating shaft, released from the frictional force, may rapidly accelerate. This may result in excessive vibration or over-rotation or overspeeding beyond the design rotation speed.

[0073] In contrast, in a first aspect of this embodiment, the bearing device includes a tilting pad, a support portion, an elastic portion, and a regulating portion. The bearing device is, for example, the bearing device 30 described above. The tilting pad is, for example, the tilting pad 32A described above. The support portion is, for example, the pivot 32B described above. The elastic portion is, for example, the elastic body 32C described above. The regulating portion is, for example, the regulating portion 31C described above. Specifically, the tilting pad faces a rotation shaft. The rotation shaft is, for example, the rotation shaft 20 described above. The support portion supports the tilting pad from the outside in the radial direction based on the axis of the rotation shaft. The axis is, for example, the rotation axis AX described above. The elastic portion urges the support portion toward the inside in the radial direction. The regulating portion regulates the movement of the support portion toward the inside in the radial direction so as to create a gap between the tilting pad and the rotation shaft.

[0074] This allows the bearing device to suppress contact between the tilting pad and the rotating shaft due to the preload on the tilting pad, thereby suppressing the above-mentioned adverse effects due to the preload on the tilting pad.

[0075] Furthermore, in a second aspect of this embodiment, based on the first aspect described above, the regulating portion may regulate the movement of the support portion toward the inside in the radial direction when the support portion abuts against the regulating portion from the outside in the radial direction, and may not come into contact with the support portion when the movement of the support portion toward the inside in the radial direction is not being regulated.

[0076] This allows the bearing device to avoid contact with the support part except when the restricting part restricts the radially inward movement of the support part. Therefore, the bearing device can prevent a situation in which the support part slides in contact with the restricting part and causes friction loss when the support part moves radially outward in response to the formation of a fluid film between the tilting pad and the rotating shaft, for example, from the start of rotation to steady-state rotation.

[0077] In a third aspect of this embodiment, based on the second aspect described above, the restricting portion may have a first surface against which the support portion abuts from the outside in the radial direction at a circumferential position based on the axis of the rotating shaft where the support portion is disposed, thereby restricting the movement of the support portion toward the inside in the radial direction, and a second surface facing the support portion across a gap in a direction perpendicular to the radial direction. The first surface is, for example, the above-described surface 31Ca. The second surface is, for example, the above-described surface 31Cb. The gap is, for example, the above-described gap GP.

[0078] This allows the regulating portion to regulate the first surface from moving radially inward of the support portion, and also prevents the support portion from sliding against the second surface while in contact with it when the support portion moves radially, thereby preventing friction loss from occurring.

[0079] Although the embodiments have been described in detail above, the present disclosure is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist described in the claims. [Explanation of symbols]

[0080] 1. Expansion turbine 20 Rotation axis 30 Bearing device 31 Case 31C Regulatory Department 31Ca,31Cb plane 32 Radial bearing 32A Tilting Pad 32B Pivot 32Ba,32Bb surface 32C Elastic body 32D adjustment section

Claims

1. a tilting pad facing the rotation axis; a support portion that supports the tilting pad from the outside in a radial direction based on the axis of the rotation shaft; an elastic portion that biases the support portion toward the inside in the radial direction; a restricting portion that restricts movement of the support portion toward the inside in the radial direction so as to generate a gap between the tilting pad and the rotation shaft, Bearing device.

2. the restricting portion restricts movement of the support portion toward the inside in the radial direction when the support portion abuts against the restricting portion from the outside in the radial direction, and does not come into contact with the support portion when the restricting portion is not restricting movement of the support portion toward the inside in the radial direction. The bearing device according to claim 1 .

3. The restricting portion has a first surface against which the support portion abuts from the outside in the radial direction at a circumferential position based on the axis of the rotation shaft where the support portion is disposed, thereby restricting movement of the support portion toward the inside in the radial direction, and a second surface that faces the support portion via a gap in a direction perpendicular to the radial direction. The bearing device according to claim 2 .

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