JP2017160966A - Tilting pad thrust bearing and rotary machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilting pad thrust bearing which secures strength, inhibits one-side contact of a bearing pad itself, can be simply designed, and enables improvement of the load capacity.SOLUTION: A tilting pad thrust bearing includes: multiple tilting pads 20A; and a bearing stand 10A supporting the tilting pads 20A. The bearing stand 10A includes: housing spaces 11 which respectively house parts of the tilting pads 20A; movable support parts 12 which movably support the tilting pads 20A in a thrust direction; and biasing force application parts 41, each of which contacts with a center part of the tilting pad from a back surface and applies an elastic biasing force. A pivot 50 is provided at a contact portion of one of the tilting pad 20A and the biasing force application part 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tilting pad thrust bearing that supports a thrust direction force of a rotating machine that rotates at high speed, such as a supercharger, and a rotating machine that includes the tilting pad thrust bearing.

For example, in a rotating machine that rotates at high speed such as a supercharger, a thrust bearing is used for a rotating shaft.
FIG. 5 is a schematic configuration diagram of the rotor 110 constituting the supercharger disclosed in Patent Document 1. As shown in FIG. 5, the rotor 110 includes a rotating shaft 111 and an exhaust turbine wheel 112 and a compressor wheel 113 attached to both ends of the rotating shaft 111.

  The rotor 110 rotates at high speed in the direction indicated by the arrow a by the energy of the combustion exhaust gas supplied to the exhaust turbine wheel 112. At this time, a thrust load acts on the rotating shaft 111 by the energy of the combustion exhaust gas. For this reason, the rotating shaft 111 is rotatably supported by the thrust bearing 120 together with the journal bearing 114.

  The thrust bearing 120 shown in FIG. 5 normally includes a thrust disk (thrust collar) 130 that rotates integrally with the rotary shaft 111 and a fixed-side disk 140 that is installed to face the thrust disk 130. The thrust disk 130 and the stationary disk 140 are in sliding contact with each other via an oil film, and the thrust load applied to the rotating shaft 111 is supported via the thrust disk 130 and the stationary disk 140.

  However, when the thrust load is large, the thrust disk 130 is inclined to be in a one-piece state. As a result, the surface pressure applied to the stationary disk 140 becomes non-uniform, and accordingly, the formation of an oil film between the thrust disk 130 and the stationary disk 140 may be affected.

  On the other hand, according to a tilting pad thrust bearing (hereinafter also referred to as a tilting pad bearing) using a tilting pad (hereinafter also simply referred to as a pad) on the stationary disk, the pad follows the inclination of the thrust disk. Therefore, the contact between the pad and the thrust disk is suppressed, and an oil film is easily formed properly between the pad and the thrust disk.

  In the tilting pad bearing, the pad is supported so as to be able to follow the inclination of the thrust disk via the pad support member. For example, in the tilting pad bearing disclosed in Patent Document 2, as shown in FIG. 6, the pad 160 is cantilevered by a pad support member 150 fixed to the base.

  That is, a plurality of (eight in this case) cantilever beams 152 are formed on the side of the annular pad support member 150 facing the thrust disk 130. The base end of the cantilever 152 is supported by the main body 151 of the pad support member 150 and extends in an annular direction parallel to the disk surface direction of the thrust disk 130. A pad support portion 153 is provided at the tip portion extending in the annular direction.

  The pad support portion 153 is movable in the thrust direction (direction away from and contacting the disk surface of the thrust disk 130) by elastic deformation of the cantilever 152, and a pad support hole 154 is formed in the pad support portion 153. Is done. The pad 160 is supported by each cantilever 152 by fitting a pin portion 161 provided on the back surface of the pad 160 into the pad support hole 154. Therefore, the pad 160 is movable in the thrust direction by the elastic deformation of the cantilever 152. A hole 155 is formed on the back side of the cantilever 152 of the main body 151 to facilitate elastic deformation of the base of the cantilever 152.

  Thus, the pad 160 follows the inclination of the thrust disk 130 by the elastic support structure that supports the pad 160 movably in the thrust direction. Accordingly, when the thrust disk 130 is inclined, each pad 160 is inclined according to the pressure distribution from the thrust disk 130.

As a result, a wedge-shaped space is formed between the sliding contact surfaces of the thrust disk 130 and the pad 160, and the lubricating oil enters the wedge-shaped space by sliding of both. The load capacity can be obtained by this lubricating oil.
Each pad 160 can be supported while the load capacity is secured and the distribution of the thrust load from the thrust disk 130 is made uniform.

JP 2013-1113412 A JP-T 8-502115

  As described above, the tilting pad thrust bearing is effective in dealing with the case where the thrust load is large and the thrust disk is tilted to be in a single contact state. The structure supported by the cantilever has the following problems.

The cantilever structure may weaken the strength. Further, when the pad is tilted, the pad itself may come into contact with the thrust disk.
In addition, it is necessary to design in consideration of two deformations: elastic deformation at the base of the cantilever and elastic deformation of the beam from the base of the cantilever to the pad support at the tip, which is complicated. Therefore, the design cost is high.
Furthermore, for example, since the supercharger uses lubricating oil containing foreign matters such as engine lubricating oil, when the oil film thickness becomes thin, the foreign matters may be caught and seized. For this reason, it is necessary to ensure the oil film thickness and to further improve the load capacity.

  The present invention was devised in view of such problems, can ensure strength, can suppress the occurrence of per-tilting of the tilting pad pad itself, can be designed simply, and can further improve the load capacity. It is an object of the present invention to provide a tilting pad thrust bearing and a rotating machine using the same.

  (1) In order to achieve the above object, a tilting pad thrust bearing according to the present invention includes a plurality of tilting pads arranged in an annular shape and a bearing base that supports the plurality of tilting pads, A tilting pad thrust bearing that slides a tilting pad on a thrust disk of a rotating shaft to support a force in a thrust direction, wherein the bearing stand accommodates a part of the tilting pad; and A movable support portion that movably supports the tilting pad in the thrust direction; and a biasing force imparting portion that abuts against a central portion of the tilting pad from the back side to impart an elastic biasing force, the tilting pad and the A pivot is provided at any one of the contact portions with the urging force applying portion.

  (2) The urging force applying portion is configured to have a thinned structure in which a portion corresponding to the center portion of the tilting pad of the bearing base is partially thinned and configured to be elastically deformable in the thrust direction. It is preferable.

  (3) The biasing force applying portion is configured by a leaf spring that is attached to a notch portion formed in a portion corresponding to the center portion of the tilting pad of the bearing base and is elastically deformable in the thrust direction. It is preferable.

  (4) The biasing force applying portion is mounted on a notch portion formed in a portion corresponding to the center portion of the tilting pad of the bearing base, and is configured by a beam structure that is elastically deformable in the thrust direction. Preferably it is.

  (5) It is preferable that the urging force applying portion has a beam structure that extends in the annular direction in which the tilting pads are arranged and is supported at both ends in the annular direction.

  (6) Grooves having a U-shaped cross-sectional shape are formed on both sides of the outer periphery of the tilting pad in the annular direction, and the movable support portion is formed on both sides of the thrust disk on the annular direction of the inner wall portion of the housing space. It has a ridge that extends in a direction parallel to the disk surface and projects toward the housing space, and fits in the groove of the tilting pad with play in the thrust direction. Is preferred.

  (7) The accommodation space is configured to open at the annular outer peripheral portion of the bearing stand, and to be able to enter and exit the accommodation space from the opening side of the tilting pad, and is inserted into the outer periphery of the accommodation space. It is preferable that a cover for preventing the tilting pad from being detached from the opening is attached.

  (8) It is preferable that a lubricating oil supply hole for supplying lubricating oil from the annular outer peripheral portion of the bearing base to the sliding contact portion between the tilting pad and the thrust disk is formed in the bearing base.

  (9) The tilting pad is preferably formed in a circular shape.

  (10) A rotating machine according to the present invention includes the tilting pad thrust bearing according to any one of (1) to (9).

  According to the present invention, when the thrust load applied to the rotating shaft is large and the thrust disk is tilted, a part of the tilting pad comes into contact with the thrust force from the thrust disk increasing. In this case, the thrust force moves the pushing pad against the elastic biasing force of the biasing force applying portion (pushing it). For this reason, locally increasing surface pressure is suppressed, and a lubricating oil film having a required thickness is reliably formed between the sliding contact surfaces of the tilting pad and the thrust disk. Thereby, damage due to seizure of the bearing is prevented. Further, while the tilting pad is movably supported by the movable support portion, the biasing force applying portion applies an elastic biasing force to the tilting pad from the back surface, so that the support of the tilting pad and the biasing force application are shared. Therefore, it is easy to ensure the strength of the bearing and can be designed simply.

  Further, since the tilting pad can be tilted with the pivot at its center as a pivot, the thrust disk is inclined, and the sliding surface of each tilting pad comes into contact with the sliding surface of the thrust disk. If this is done, the wedge action between the two sliding surfaces will prevent the tilting pad from tilting and the one-sided contact will be prevented. The sliding surface of the tilting pad will be used widely and will receive the thrust force of the thrust disk. The capacity can be increased.

It is a figure which shows the tilting pad thrust bearing concerning 1st Embodiment of this invention, (a) is the top view seen from the front, (b) is a side view which shows the support structure of the tilting pad (FIG. 1) It is an outer peripheral surface expanded view along the AA arrow of (a). It is a side view which shows the operation | movement with respect to the increase in the thrust load of the tilting pad thrust bearing concerning 1st Embodiment of this invention, (a) shows the state before the operation, (b) shows the state after the operation. Show. It is a side view (figure corresponding to Drawing 1 (b)) showing the support structure of the tilting pad of the tilting pad thrust bearing concerning a 2nd embodiment of the present invention. It is a side view (figure corresponding to Drawing 1 (b)) showing the support structure of the tilting pad of the tilting pad thrust bearing concerning a 3rd embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the thrust bearing concerning the background art applied to the rotor while showing the rotor of the supercharger which is an example of the rotary machine to which this invention is applied. It is a figure which shows the tilting pad thrust bearing concerning background art, (a) is the rear view, (b) is a perspective view which shows the support structure of the tilting pad, (c) is the support structure of the tilting pad FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that each embodiment described below is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the following embodiments can be implemented with various modifications without departing from the spirit thereof, and can be selected as necessary or can be appropriately combined.

Further, the tilting pad thrust bearing according to each embodiment is used as a thrust bearing of a rotating shaft of a rotating machine that rotates at a high speed such as a supercharger.
If the rotating machine is, for example, a supercharger, as described with reference to FIG. 5, the thrust bearing 120 is provided so as to sandwich the thrust disk (thrust collar) 130 of the rotating shaft 111 of the rotor 110 constituting the supercharger. However, the tilting pad thrust bearing is applied in place of the thrust bearing 120.

[First Embodiment]
(Constitution)
A tilting pad thrust bearing (hereinafter also referred to as a tilting pad bearing) according to the first embodiment will be described with reference to FIGS.
As shown in FIG. 1, the tilting pad bearing 1 </ b> A has a bearing base 10 </ b> A formed in an annular shape (here, an annular shape), and is arranged and supported on the bearing base 10 </ b> A in an annular shape (here, an annular shape). A plurality of (herein, eight) tilting pads (hereinafter simply referred to as pads) 20A.

  The pad 20A is formed in a circular shape when viewed from the front, and the pad surface (sliding contact surface with the thrust disk 130) 20f is also formed in a circular shape. A groove 21 having a U-shaped cross section is formed on the outer periphery of the pad 20A. The groove 21 having the U-shaped cross-sectional shape may not be the entire circumference of the pad 20A, but may be formed at least on both sides of the pad 20A in the annular direction. However, if the groove 21 is formed over the entire circumference as in the present embodiment, the pad 20A can be rotated, and the wear of the pad surface 20f is made uniform.

  For the pad 20A, for example, a different material is used for the steel thrust disk 130. As long as it is a metal material, for example, a white metal, a copper alloy, an aluminum alloy, or the like can be used, and a non-metal material such as a resin material can also be used.

  In the bearing stand, the accommodation space 11 for accommodating a part of the pad 20A (the part excluding the pad surface 20f side) and the pad 20A can be moved in the thrust direction (direction in which the thrust force is received from the thrust disk 130 and vice versa). The movable support part 12 to support is provided, and the biasing force provision part 41 which contact | abuts to the center part of the pad 20A from a back surface, and provides an elastic biasing force is provided.

  The accommodation spaces 11 are provided by the number of pads 20A (eight in this case) at equal intervals in the circumferential direction of the annular bearing stand 10A. The accommodation space 11 opens to the surface 10f side of the bearing base 10A on which the pad 20A is mounted in a side view shown in FIG. 1 (b), and has an annular shape of the bearing base 10A in a plan view shown in FIG. 1 (a). It opens to the outer periphery 10c side and is formed in a closed bag shape on the inner periphery side of the bearing stand 10A.

  The movable support portion 12 is a protrusion that extends in a direction parallel to the disk surface of the thrust disk 130 (a direction perpendicular to the thrust direction) on the inner wall portion 11 w of the accommodation space 11 and projects toward the center of the accommodation space 11. It is formed by strips. The ridge portion 12 extends in a U shape so as to follow the inner wall portion 11w of the accommodating space 11, and is fitted in the groove 21 of the pad 20A with play in the thrust direction. Thereby, the protrusion 12 supports the pad 20A so as to be movable in the thrust direction.

  In the present embodiment, the ridge 12 is formed by a continuation extending in a U-shape, but the ridge 12 is provided on both sides in the annular direction across the pad 20A of the inner wall 11w of the accommodation space 11. It may be formed, and may be formed individually.

  The urging force applying portion 41 is configured to have a thinned structure in which the portion corresponding to the center portion of the mounted pad 20A is partially thinned and elastically deformable in the thrust direction in the bearing base 10A. Yes. That is, a groove (slit) having a width W1 in the radial direction from the outer peripheral side to the inner peripheral side of the bearing base 10A is formed on the back side of the housing space 11 of the bearing base 10A (the side opposite to the mounting side of the pad 20A). 41a is formed, and the thinned structure 41 extending in the radial direction is formed by the groove 41a.

As shown in FIG. 1B, the thinned structure 41 has a double-supported beam structure that extends in the annular direction in which the tilting pads 20A are arranged and is supported at both ends in the annular direction.
The thinned structure 41 is in contact with the center portion of the pad 20A via a pivot 50 described later, and elastically deforms when the pad 20A receives a thrust force, thereby allowing the pad 20A to shift in the thrust direction.

  On the back surface of the pad 20A, a pivot 50 that supports the pad 20A so as to be tiltable by the pad 20A and the thinned structure 41 is provided. The pivot 50 has an outer surface formed in a spherical shape, and abuts the pad 20A and the thinned structure 41 by point contact or surface contact close to a point. The pivot 50 may be formed on either the pad 20A or the thinned structure 41.

  The beam length (= width of the groove 41a) W1 of the thinned structure 41 is set to be larger than the diameter W2 of the pivot 50, and how the pivot 50 abuts against the thinned structure 41. Also, the elastic force of the thinned structure 41 is applied to the pad 20A.

Further, on the outer periphery of the accommodation space 11, that is, on the outer periphery 10c of the bearing stand 10A, the pads 20A inserted into the accommodation space 11 are prevented from being detached from the opening on the outer periphery 10c side of the accommodation space 11. A ring-shaped cover 30 is attached.
The bearing base 10A is formed with a lubricating oil supply hole 13 for supplying lubricating oil from the annular outer periphery 10c to the sliding contact portion 20f between the pad 20A and the thrust disk 130.
Note that the cover 30 is mounted so as to avoid a portion that opens to the annular outer peripheral portion 10 c of the lubricating oil supply hole 13.

(Function and effect)
Since the tilting pad thrust bearing 1A according to the present embodiment is configured as described above, when the thrust load applied to the rotating shaft is large and the thrust disk 130 is inclined, a part of the tilting pad is provided. In 20A, the one-side contact where the thrust force from the thrust disk 130 becomes strong occurs.

  For example, FIG. 2 illustrates a case where a strong thrust force (see a white arrow) is applied to a part of the three adjacent pads 20A (here, the center pad 20A) and the thrust disk 130 comes into contact with each other.

  If the thrust force from the thrust disk 130 is not strong in any of the pads 20A, as shown in FIG. 2A, each pad 20A is moved to the thrust disk 130 side (in FIG. 2, by the elastic force of the thinned structure 41). Pressed upward). In the example shown in FIG. 2A, in any of the pads 20A, one wall portion (lower wall portion) 23 of the groove 21 abuts on the ridge portion 12 and is on the thrust disk 130 side (upward in FIG. 2). It is in a protruding state.

  In this state, when the thrust disk 130 hits the center pad 20A and a strong thrust force is applied, the thrust force resists the elastic force of the thinned structure 41 and separates the pad 20A from the thrust disk 130 (see FIG. 2), move downward (push it). Here, the other wall portion (upper wall portion) 22 of the groove 21 is in contact with the protruding portion 12. As a result, the local increase in the surface pressure is suppressed, and a lubricating oil film having a required thickness is reliably formed between the sliding contact surfaces of the pad 20A and the thrust disk 130. Thereby, damage due to seizure of the pad 20A is prevented, and the life of the pad 20A is improved. In addition, while the pad 20A is movably supported by the movable support part 12, the urging force applying part 41 applies an elastic urging force to the pad 20A from the back, so that the support of the pad 20A and the urging force application are shared, and the bearing It is easy to ensure the strength and can be designed simply. In particular, the thinning structure 41 that is the urging force applying portion has a double-supported beam structure, and the urging force is applied to the pad 20A with the double-supported beam structure, so that it is easier to ensure the strength of the bearing.

  Further, since the pad 20A can be tilted about the central portion thereof by the pivot 50, the thrust disk 130 is tilted, and the sliding surface of each pad 20A comes into contact with the sliding surface of the thrust disk 130. Even in this case, the pad 20A is tilted by the wedge action of the lubricating oil generated between the two sliding surfaces, and the one-sided contact is prevented. As a result, the sliding surface of the pad 20A can be widely used to receive the thrust force of the thrust disk 130, and the load capacity can be increased.

[Second Embodiment]
(Constitution)
With reference to FIG. 3, the tilting pad bearing 1B concerning 2nd Embodiment is demonstrated.
The tilting pad bearing 1B of the present embodiment is obtained by changing only the urging force applying portion 42 with respect to that of the first embodiment. Hereinafter, description of the same configuration as that of the first embodiment will be omitted, and description will be given focusing on the urging force applying unit 42.

  As shown in FIG. 3, in the present embodiment, in the bearing base 10 </ b> B, a notch portion 14 that is partially cut out so as to communicate with the accommodation space 11 at a location corresponding to the center portion of the attached pad 20 </ b> A. It is formed. The urging force applying portion 42 is configured by a leaf spring that is attached to the notch portion 14 and is elastically deformable in the thrust direction.

  The notch 14 in this case may be formed to extend in the radial direction from the outer peripheral side to the inner peripheral side of the bearing base 10B, similarly to the groove 41a of the bearing base 10A of the first embodiment. What is necessary is just to be provided in the location corresponding to the center part of 20A, and may be formed partially in radial direction. Further, the notch portion 14 is formed so as to penetrate the bearing base 10A downward in the thickness direction (vertical direction in FIG. 3), but may not penetrate the bearing base 10A downward in the thickness direction.

  The leaf spring 42 extends along a tangential direction with respect to the circumferential direction (annular direction) of the bearing base 10B, and both end portions (left and right end portions in FIG. 3) are fixed to corresponding portions of the bearing base 10B by welding or the like. . Therefore, like the thinned structure 41, the leaf spring 42 also has a double-supported beam structure that extends in the annular direction in which the pads 20A are arranged and is supported at both ends in the annular direction.

  The length W3 of the beam of the leaf spring 42 is also set larger than the diameter W2 of the pivot 50, and the elastic force of the leaf spring 42 is applied to the pad 20A no matter how the pivot 50 comes into contact with the leaf spring 42. It comes to work.

(Function and effect)
Since the tilting pad thrust bearing 1B according to the present embodiment is configured as described above, the same operations and effects as those of the first embodiment can be obtained.
In particular, in this embodiment, since the urging force applying portion 42 is configured by a leaf spring, the elastic characteristics of the urging force applying portion 42 in the thrust direction can be easily set, and the urging force optimum for the pad 20A is obtained. Can be added.

[Third Embodiment]
(Constitution)
A tilting pad bearing 1C according to the third embodiment will be described with reference to FIG.
The tilting pad bearing 1 </ b> C of the present embodiment is obtained by changing the biasing force applying portion 43 with respect to those of the first and second embodiments and providing the pivot 51 toward the biasing force applying portion 43. Hereinafter, the description of the same configuration as that of the first embodiment will be omitted, and the urging force applying unit 43 will be mainly described.

  As shown in FIG. 4, in the present embodiment, in the bearing base 10 </ b> C, a notch portion 15 that is partially cut out so as to communicate with the accommodation space 11 at a location corresponding to the central portion of the mounted pad 20 </ b> C. It is formed. The urging force imparting portion 43 is mounted on the cutout portion 15 and is formed of a beam structure that can be elastically deformed in the thrust direction.

  The notch 15 in this case may be formed to extend in the radial direction from the outer peripheral side to the inner peripheral side of the bearing base 10C in the same manner as the groove 41a of the bearing base 10A of the first embodiment. What is necessary is just to be provided in the location corresponding to the center part of 20C, and you may form partially in radial direction. Further, the notch 15 does not penetrate the bearing base 10C to the lower side in the thickness direction, and the wall 15a that supports the beam structure 43 in the anti-thrust direction (upper in FIG. 4) remains.

  The beam structure 43 includes a beam-like portion 43a extending along a tangential direction with respect to the circumferential direction (annular direction) of the bearing base 10C, and both ends (left and right end portions in FIG. 4) corresponding to the bearing base 10C. And both leg portions 43b fixed to the head. Therefore, similarly to the thinned structure 41, the beam-like portion 43a of the beam structure 43 has a double-supported beam structure extending in the annular direction in which the pads 20C are arranged and supported at both ends in the annular direction.

  The length W4 of the beam-like portion 43a is also set larger than the diameter W2 of the pivot 51, and the elastic force of the beam-like portion 43a is not affected by the pad 20C regardless of how the pivot 51 comes into contact with the pad 20C. It comes to act on.

(Function and effect)
Since the tilting pad thrust bearing 1C according to the present embodiment is configured as described above, the same operations and effects as those of the first embodiment can be obtained.
In particular, in this embodiment, since the biasing force applying portion is configured by the beam structure 43 that is separate from the bearing base 10C, the elastic characteristics of the beam structure 43 in the thrust direction can be easily set. An optimal biasing force can be applied to the pad 20C.

(Other)
As mentioned above, although embodiment which concerns on this invention was described, this invention can be implemented by changing said embodiment suitably.
For example, in each of the above-described embodiments, the urging force applying portions 41 to 43 of various aspects have been exemplified, but it is important that the urging force applying portion abuts against the center portion of the tilting pad from the back surface to apply an elastic urging force. However, the present invention is not limited to the above embodiment. However, the urging force applying portion preferably has a beam structure that extends in an annular direction in which the tilting pads are arranged and is supported at both ends in the annular direction.

  Further, since the pads 20A and 20C are circular, they are preferable in manufacturing, but are not limited to this shape. However, in load distribution, it is preferable that the planar height position of each pad is the same.

1A, 1B, 1C Tilting pad thrust bearing 10A, 10B, 10C Bearing base 10c Outer circumference of bearing base 10A 11 Housing space 11w Inner wall portion of housing space 11 12 Projection portion (movable support portion)
14, 15 Notch 20A, 20C Tilting pad (pad)
20f Pad surface (sliding contact surface with thrust disc)
30 Cover 41 Thin-walled structure (biasing force applying part)
42 leaf spring (biasing force applying part)
43 Beam structure (energizing part)
43a Beam-shaped portion 43b of beam structure 43b Leg portions 50 and 51 of beam structure 43 Pivot 110 Rotor 111 Rotating shaft 130 Thrust disk (thrust collar)

Claims (10)

A plurality of tilting pads arranged in an annular shape and a bearing base that supports the plurality of tilting pads are provided, and the tilting pads are slidably contacted with a thrust disk of a rotating shaft via lubricating oil in the thrust direction. A tilting pad thrust bearing for supporting force,
The bearing stand is
An accommodating space for accommodating a part of the tilting pad;
A movable support portion that movably supports the tilting pad in the thrust direction;
An urging force applying portion that abuts against the center portion of the tilting pad from the back surface and applies an elastic urging force; and
A tilting pad thrust bearing, wherein a pivot is provided at one of the abutting portions of the tilting pad and the urging force applying portion. The urging force applying portion is configured to have a thinned structure in which a portion corresponding to the center portion of the tilting pad of the bearing base is partially thinned and configured to be elastically deformable in the thrust direction. The tilting pad thrust bearing according to claim 1. The biasing force applying portion is configured by a leaf spring that is attached to a notch portion formed in a portion corresponding to the center portion of the tilting pad of the bearing stand and is elastically deformable in the thrust direction. The tilting pad thrust bearing according to claim 1. The urging force applying portion is mounted on a notch portion formed in a portion corresponding to the center portion of the tilting pad of the bearing base, and is configured by a beam structure that is elastically deformable in the thrust direction. The tilting pad thrust bearing according to claim 1. 5. The till according to claim 1, wherein the urging force applying portion has a beam structure that extends in the annular direction in which the tilting pads are arranged and is supported at both ends in the annular direction. Ting pad thrust bearing. On both sides of the annular direction of the outer periphery of the tilting pad, grooves having a U-shaped cross section are formed,
The movable support portion extends in a direction parallel to the disk surface of the thrust disk on both sides of the annular wall of the inner wall portion of the housing space and protrudes toward the housing space, and the groove of the tilting pad The tilting pad thrust bearing according to any one of claims 1 to 5, further comprising a protrusion that fits in the thrust direction with play. The accommodation space is configured to be opened at the annular outer peripheral portion of the bearing base, and to be able to enter and exit the accommodation space from the opening side of the tilting pad.
The tilting pad according to any one of claims 1 to 6, wherein a cover for preventing the inserted tilting pad from being removed from the opening is attached to an outer periphery of the accommodation space. Thrust bearing. 2. A lubricating oil supply hole is formed in the bearing base for supplying lubricating oil from an annular outer peripheral portion of the bearing base to a sliding contact portion between the tilting pad and the thrust disk. The tilting pad thrust bearing according to any one of? 7. The tilting pad thrust bearing according to claim 1, wherein the tilting pad is formed in a circular shape. A rotating machine comprising the tilting pad thrust bearing according to any one of claims 1 to 9.

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