JP2000266040A - Slide bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide bearing having a stable characteristic in a high- speed rotary machine. SOLUTION: Notches 5 are provided in plural places in the inner peripheral side of an annular base ring 2, an elastically deformable supporting member 9 is fixed in each notch 5 by a bolt 13, and a circular-arc bearing pad 6 is fixed to the supporting member 9 by the bolt 13. Since the bearing pad 6 is integrally fixed to the base bearing 2 via the supporting member 19, even if used for a high-speed rotary machine, no damage or wear occurs in the backside of the bearing pad 6. When wear or the like occurs in the sliding part 7 of the bearing pad 6, since the bearing pad 6 is easily removed from the base ring 2 by removing the bolt 13, the repairing of the sliding part 7 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing for supporting a load via a fluid film, and more particularly to a tilting pad type sliding bearing capable of exhibiting stable characteristics in a high-speed rotating machine.

[0002]

2. Description of the Related Art A plain bearing is a bearing that supports a load through a fluid film, and has a large load capacity, a good high-speed performance, a semi-permanent life, and a vibration absorption. It is widely used as a bearing for rotating machinery because it has characteristics such as "high resistance and impact resistance".

There are various types of slide bearings having such characteristics. For example, in a high-speed rotating machine, a tilting pad type slide bearing 41 as shown in FIG. I have.

That is, the plain bearing 41 is provided with an annular base ring 42, an arc-shaped bearing pad 45 provided on the inner peripheral side of the base ring 42, and provided between the bearing pad 45 and the base ring 42. And a pivot 47 for movably supporting the bearing pad 45. The rotating shaft (not shown) can be rotatably supported on the inner surface side of the bearing pad 45 via a fluid film. Since the bearing pad 45 moves (oscillates) following the movement of the shaft, stable characteristics can be exhibited in a high-speed region. Therefore, the bearing pad 45 is often used as a bearing for rotating machines such as a steam turbine and a compressor.

[0005] However, recent rotary machines are becoming increasingly faster,
Since the sliding bearing 41 having the above-described configuration is used because the size tends to be reduced and the load tends to be increased, "the pivot 47 is damaged by applying a high load, and the operation of the rotary machine becomes impossible."", The pivot 47 is excessively worn by the flexible movement (oscillation) of the bearing pad 45, the bearing gap is increased, and the shaft vibration is increased.

In order to avoid such a problem, as shown in FIG. 5, a tilting pad type plain bearing 51 in which a bearing pad 55 and a base ring 52 are integrally formed is provided on the market.

[0007] This sliding bearing 51 has a column 57 between a base ring 52 and a bearing pad 55 instead of a pivot.
Is provided, and the base ring 52 and the bearing pad 55 are integrally connected via the support column 57. In this case, since the column 57, the base ring 52, and the bearing pad 55 are formed integrally, even if the bearing pad 55 is flexibly movable (oscillates), the pivot 47 is moved as in the above-described slide bearing 41. There is no possibility that the bearing clearance is increased due to excessive wear and the shaft vibration is increased.

However, in the plain bearing 51, since the bearing pad 55 and the support column 57 cannot be replaced as a single product, the bearing pad 5 and the support column 57 may be used when the shaft diameter is slightly changed.
It is not possible to respond by changing the dimensions of 5 and the strut 57.

If the sliding portion 56 made of white metal or the like of the bearing pad 55 is damaged during use,
Because the bearing pad 55 cannot be replaced by itself,
The entire bearing must be replaced with a new one, which increases repair costs.

Further, the sliding portion 56 made of white metal or the like on the inner peripheral surface of the bearing pad 55 has a diameter of 0.1 mm by wire electric discharge machining. Since the bearing is formed as thin as several mm, it takes a lot of time to obtain the coaxiality between the inner peripheral surface of the bearing pad 55 and the outer peripheral surface of the bearing when the outer diameter of the bearing is large.

Furthermore, if the sliding portion 56 is found to be damaged during wire electric discharge machining, the bearing pad 55 cannot be replaced as a single product, and the entire bearing must be rebuilt.

Since the entire bearing must be made of a hard material in order to give rigidity to the column 57, the machinability is very poor and the machining cost is high.

The present invention solves the above-mentioned problems of the prior art. "Even if the bearing pad is movable (swings) flexibly, the bearing pad can be moved like a conventional tilting pad bearing. The back side of the shaft will not wear excessively and the bearing clearance will not increase, increasing the shaft vibration. "," Even if the shaft diameter is slightly changed, I can respond. "
"If the sliding part made of white metal or the like of the bearing pad is damaged during use, the replacement cost can be reduced by replacing part of the bearing without rebuilding the entire bearing." If damage is found in the sliding part, it can be dealt with by replacing the parts without rebuilding the whole bearing. "," To make the columns rigid, the whole bearing is made of a hard material It is intended to provide a "no need" slide bearing.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an annular base ring, which is provided on the inner peripheral side of the base ring, and rotates a rotating shaft via a fluid film. An arc-shaped bearing pad that is freely supported and is movable in accordance with the movement of the rotating shaft, and is provided between the bearing pad and the base ring to integrally connect the two; And an elastically deformable supporting member for movably supporting the supporting member.
Further, a means is employed in which one end of the support member is fixed to a back portion of the bearing pad by a fastening member such as a bolt, and the other end is fixed to an inner peripheral portion of the base ring by a fastening member such as a bolt. It is. Further, a means is employed in which one end of the support member is fixed to the back surface of the bearing pad by fitting, and the other end is fixed to the inner peripheral portion of the base ring by fitting. Further, one end of the support member is fixed to the back surface of the bearing pad by a fastening member such as a bolt or the like, and the other end is fixed to the inner peripheral portion of the base ring by a fastening member such as a bolt. That is, the above-mentioned means are adopted. Then, one end of the support member is fixed to the back surface of the bearing pad via connection means such as welding or bonding, and the other end is connected to the inner peripheral part of the base ring via connection means such as bonding. And fixed means.

[0015]

According to the present invention having the above-described structure,
The bearing pad is movably supported by a flexibly elastically deformable support member, and moves (oscillates) following the movement of the rotating shaft. In addition, the support member has one end fixed to the bearing pad side and the other end fixed to the base ring side by a coupling member such as a bolt or other fastening member, fitting or welding, or bonding. Bearing pads are
By removing a fastening member such as a bolt, releasing the fitted state, or releasing connection means such as welding or bonding, replacement can be easily performed.

[0016]

Embodiments of the present invention shown in the drawings will be described below. FIG. 1 shows a first embodiment of a plain bearing according to the present invention. The plain bearing 1 is a tilting pad type plain bearing, comprising an annular base ring 2 and a base ring 2. Arc-shaped bearing pad 6 provided on the inner peripheral side of
And a support member 9 provided between the base ring 2 and the support pad 6 for movably supporting the bearing pad 6.

The base ring 2 is formed in two, and the two semi-annular ring halves 3, 3 are integrally connected by bolts 4 between the circumferential ends thereof.
The whole is formed in a ring shape. The base ring 2 is not limited to two.

On the inner peripheral side of the base ring 2, notches 5 are provided at a plurality of locations (two locations on each ring half 3 in total) at predetermined intervals in the circumferential direction. The support member 9 is attached inside.

The bearing pad 6 has a sliding portion 7 made of white metal or the like formed integrally on the inner peripheral surface thereof with a predetermined thickness, and thereafter, the whole is divided into a plurality in the circumferential direction and formed in an arc shape. A flat mounting portion 8 is provided in the center of the rear surface, and the mounting portion 8 is provided with a screw hole having a predetermined depth.

The support member 9 has two flat plate-like mounting portions 10 and 11 facing each other at a predetermined interval, and both mounting portions 1 and 11.
0 and 11 are formed to have a substantially H-shaped cross section including a flat support portion 12 that integrally connects the central portions of the opposing surfaces, and screw holes or bolt insertions are provided in both mounting portions 10 and 11. A through hole is provided.

Then, the support member 9 is located in the notch 5 of the base ring 2, and a bolt 13 is inserted from the outer peripheral side of each ring half 3 into the screw insertion hole of each ring half 3, The support member 9 is mounted in each notch 5 by screwing a screw portion into a screw hole of one mounting portion 10 of the support member 9 and tightening it with a predetermined torque.

Then, in this state, the mounting portion 8 of the bearing pad 6 is brought into close contact with the other mounting portion 11 of the support member 9, and
The bolt 13 is inserted into the screw insertion hole of the other mounting portion 11, and the screw portion is screwed into the screw hole of the bearing pad 6 and tightened with a predetermined torque. It is attached.

In this case, the other mounting portion 1 of the support member 9
1 is in a free state without being fixed to the base ring 2 side, so that the bearing pad 6 attached to the other attachment portion 11 is movable on the inner peripheral side of the base ring 2 due to the bending elastic deformation of the support member 9. It is free.

Then, the sliding bearing 1 according to this embodiment configured as described above is mounted on a rotating part of a rotating machine,
When the rotating machine is started to rotate the rotating shaft, the rotating shaft (not shown) is supported via the fluid film on the inner peripheral surface side of the bearing pad 6 and follows the movement of the rotating shaft. The bearing pad 6 moves (oscillates) via the support member 9, and can exhibit stable bearing characteristics in a high-speed rotating machine.

In this case, the support member 9 is fixed to the base ring 2 by the bolt 13 and the bearing pad 6 is fixed to the support member 9 by the bolt 13, that is, the bearing pad 6 is fixed to the support member. Since the bearing pad 6 is integrally fixed to the base ring 2 via the base 9, even if the bearing pad 6 is flexibly movable (oscillates), the bearing pad 6 is fixed as in the above-described conventional tilting pad type plain bearing. There is no case where the back surface is excessively worn to increase the bearing clearance and increase the shaft vibration.

Furthermore, the support member 9 is detachable from the base ring 2 and the bearing pad 6 is detachable from the support member 9, so that the shaft diameter can be slightly changed when the shaft diameter is slightly changed. By replacing the support member 9 and the bearing pad 6, it is possible to respond flexibly.

Further, if the sliding portion 7 made of white metal or the like of the bearing pad 6 is damaged during use,
The bearing pad 6 can be removed from the support member 9 for repair,
Since the bearing pad 6 can be replaced with a new one, there is no need to rebuild the entire bearing, and the repair cost can be reduced.

Since only the support member 9 is formed of a material having high rigidity and the other bearing pads 6 and the base ring 2 can be formed of carbon steel for general structure which is softer than that, the entire structure is formed. Unlike a material formed of a hard material, the machinability does not deteriorate, and the time required for processing can be greatly reduced.

FIG. 2 shows a second embodiment of the sliding bearing according to the present invention.
Is a tilting pad type plain bearing, 2
One mounting portion 23 of the support member 22 is fitted into a notch 18 on the inner peripheral side of a base ring 15 formed by connecting the two ring halves 16 and 16 with bolts 17 (shrink fit and cooling). And the other mounting portion 24 of the support member 22 is fitted (shrink fit, cold fit, etc.) into the mounting groove 21 of the bearing pad 19 located on the inner peripheral side of the base ring 15. ), And the other configuration is the same as that shown in the first embodiment.

The sliding bearing 14 according to this embodiment exhibits the same operation and effect as those of the first embodiment, and the one mounting portion 23 of the support member 22 is fitted. Is fixed to the base ring 15 side, and the other mounting portion 24 of the support member 22 is fixed to the bearing pad 19 side by fitting, that is, the bearing pad 19 is connected to the base ring 15 via the support member 22.
Since the bearing pad 19 is integrally fixed to the side, even if the bearing pad 19 is flexibly movable (oscillates), the back surface of the bearing pad is worn and the bearing clearance is reduced as in the above-mentioned conventional tilting pad type slide bearing. It does not increase to increase the shaft vibration.

Further, the support member 22 is connected to the base ring 15.
And the bearing pad 19 is detachable by fitting, so that when the shaft diameter is slightly changed, the supporting member 2
By replacing the bearing 2 and the bearing pad 19, it is possible to respond flexibly.

Further, if the sliding portion 20 made of white metal or the like of the bearing pad 19 is damaged during use, the bearing pad 19 is removed from the support member 22 for repair, or the bearing pad 19 is replaced with a new one. Therefore, there is no need to rebuild the entire bearing, and the repair cost can be reduced.

Since only the support member 22 can be formed of a material having high rigidity, and the other bearing pads 19 and the base ring 15 can be formed of carbon steel for general structural use which is softer than that, the whole is hard. The machinability does not deteriorate as in the case of the material formed, and the time required for processing can be greatly reduced.

FIG. 3 shows a third embodiment of the sliding bearing according to the present invention.
Is a tilting pad type plain bearing, 2
One mounting portion 36 of the support member 35 is attached to a notch 31 on the inner peripheral side of the base ring 28 formed by connecting the two ring halves 29, 29 with bolts 30 by an adhesive, welding, or the like. While fixing, base ring 2
8, the other mounting portion 37 of the support member 35 is bonded to the mounting portion 34 on the back side of the bearing pad 32 located on the inner peripheral side of the bearing pad 32.
It is fixed by connecting means such as welding, and the other configuration is the same as that shown in the first embodiment.

The sliding bearing 27 of this embodiment exhibits the same operation and effects as those of the first embodiment, and the one mounting portion 36 of the support member 35 is bonded and adhered. Base ring 2 by connecting means such as welding
8 and the other mounting portion 37 of the support member 35 is fixed to the mounting portion 34 of the bearing pad 32 by connecting means such as adhesion or welding. As a result, even if the bearing pad 32 is flexibly movable (swings), the back surface of the bearing pad is worn as in the above-described conventional tilting pad type plain bearing. Therefore, the bearing clearance does not increase and the shaft vibration does not increase.

Further, the support member 35 is connected to the base ring 28.
And the bearing pad 32 is also fixed via the connecting means. Therefore, when the shaft diameter is slightly changed, the supporting member 35 is fixed.
By replacing the bearing pad 32 and the bearing pad 32, it is possible to respond flexibly.

Further, if the sliding portion 33 made of white metal or the like of the bearing pad 32 is damaged during use, the bearing pad 32 is removed from the support member 35 for repair, or the bearing pad 32 is replaced with a new one. Therefore, there is no need to rebuild the entire bearing, and the repair cost can be reduced.

Since only the support member 35 is formed of a material having high rigidity and the other bearing pads 32 and the base ring 28 can be formed of carbon steel for general structure which is softer than that, the whole is hard. The machinability does not deteriorate as in the case of the material formed, and the time required for processing can be greatly reduced.

In the first embodiment,
One of the mounting portions 10 of the support member 9 is fixed to the base ring 2 side by bolts 13, and the bearing pad 6 is fixed to the other mounting portion 11 by bolts. One mounting portion 23 was fixed to the base ring 15 side by fitting, and the other mounting portion 24 was fixed to the bearing pad 19 side by fitting.
Although not shown, one of the mounting portions of the support member is fixed to the base ring side by bolts or fitting, and the other mounting portion is configured to be fixed to the bearing pad side by fitting or bolts. The same effects as those of the first and second embodiments can be obtained with such a configuration.

[0040]

According to the present invention, since the base ring and the bearing pad are integrally connected via the support member, the bearing pad can be flexibly moved (oscillated). However, even in the case of the conventional tilting pad type slide bearing, the rear surface of the bearing pad is not excessively worn to increase the bearing clearance and increase the shaft vibration.

In addition, with the configuration as described in claims 2 to 5, the support member can be freely attached to and detached from the base ring, and the bearing pad can be freely attached to and detached from the support member. Therefore, when the shaft diameter is slightly changed, the support member and the bearing pad can be flexibly handled by exchanging the support member and the bearing pad.

Further, if the sliding portion of the bearing pad is damaged for some reason during use, the bearing pad can be removed from the support member and repaired, or the bearing pad can be replaced with a new one. There is no need to rebuild the entire bearing, and repair costs are reduced.

Then, only the support member is formed of a material having high rigidity, and the other bearing pads and the base ring are
Because it is possible to use softer general structural carbon steel than it, as if it were formed entirely of a hard material,
The machinability is not deteriorated, and the time required for processing can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire slide bearing according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an entire slide bearing according to a second embodiment of the present invention;

FIG. 3 is a plan view showing an entire slide bearing according to a third embodiment of the present invention.

FIG. 4 is a plan view showing an example of a conventional slide bearing.

FIG. 5 is a plan view showing another example of the conventional slide bearing.

[Explanation of symbols]

1, 14, 27, 41, 51 ... sliding bearing 2, 15, 28, 42, 52 ... base ring 3, 16, 29 ... ring half 4, 13, 17, 30 ... bolt 5, 18, 31 Notch 6, 19, 32, 45, 55 Bearing pad 7, 20, 33, 56 Sliding part 8, 10, 11, 23, 24, 34, 36, 37 Mounting part 9 , 22, 35 ... Support member 12, 25, 38 ... Support part 21 ... Mounting groove 47 ... Pivot 57 ... Support

Claims (5)

[Claims] 1. An annular base ring, a circle provided on an inner peripheral side of the base ring, rotatably supporting a rotating shaft via a fluid film, and being movable following the movement of the rotating shaft. An arcuate bearing pad, and an elastically deformable support member provided between the bearing pad and the base ring to integrally connect the two and to movably support the bearing pad. Sliding bearing. 2. An end of the support member is fixed to a back surface of the bearing pad by a fastening member such as a bolt, and the other end is fixed to an inner peripheral portion of the base ring by a fastening member such as a bolt. The sliding bearing according to 1. 3. The sliding bearing according to claim 1, wherein one end of said support member is fixed to a rear surface of said bearing pad by fitting, and the other end is fixed to an inner peripheral portion of said base ring by fitting. 4. An end of the support member is fixed to a back surface of the bearing pad by a fastening member such as a bolt or a fitting, and the other end is fitted to an inner peripheral portion of the base ring or a fastening of a bolt or the like. The sliding bearing according to claim 1, wherein the sliding bearing is fixed by a member. 5. One end of the support member is fixed to the back surface of the bearing pad through a connection means such as welding or bonding, and the other end is connected to the inner peripheral part of the base ring by welding or bonding. 2. The plain bearing according to claim 1, wherein said plain bearing is fixed by means.