JPH10259825A - Self-lubricating bearing device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve resistance to wear and low friction torque of a self- lubricating bearing device. SOLUTION: PTFE(polytetrafluoroethylene) members 15, 17 filled with glass fiber are laminated on the radial sliding surface 5 and the thrust sliding surface 6 of a self-lubricating bearing 2 via porous layers 14, 16. Since the PTFE members 15, 17 filled with glass fiber have good resistance to wear and low friction characteristics, the resistance to wear and the low friction torque of the radial sliding surface 5 and the thrust sliding surface 6 are improved. The PTFE members filled with glass fiber are laminated also on the side of an oil ring 19 and a sealing surface of a floating seal 22 via porous layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a self-lubricating bearing device and a method of manufacturing the same, and more particularly to a self-lubricating bearing device having a cylindrical radial bearing and a disk-type thrust bearing, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Various types of bearing devices are used for rotating equipment to support the rotating shaft. Generally, these bearing devices supply lubricating oil to a bearing sliding surface to form a lubricating oil film, thereby reducing friction on the sliding surface. Bearing devices can be broadly classified into forced oil bearing devices and self-lubricating bearing devices according to the lubricating oil supply system.

FIGS. 13 to 15 show a conventional self-lubricating bearing device. A rotating shaft 1 extending in a horizontal direction has a small-diameter portion 1a, and the small-diameter portion 1a is a self-lubricating bearing 2 made of iron.
It is rotatably supported by. This self-lubricating bearing 2 has a lower bearing 2a and an upper bearing 2b which are divided into upper and lower parts.
And is supported inside the bearing housing 3. The lower bearing 2a and the upper bearing 2b are tightened by tightening bolts 4 as shown in FIG. The self-lubricating bearing 2 has a radial sliding surface 5 for supporting the radial load of the rotating shaft 1 and a thrust sliding surface 6 for supporting the thrust load of the rotating shaft 1. White metal 7 is fusion bonded to the surface 6.

[0004] An oil ring guide groove 8 is engraved on the radial sliding surface 5 at the center of the upper bearing 2b, and an oil ring 9 made of brass is inserted through the oil ring guide groove 8.
The oil ring 9 passes through the oil ring guide groove 8 while the upper part is in contact with the outer peripheral surface of the rotating shaft 1, and the lower part is immersed in the lubricating oil 10 in the bearing housing 3. Further, as a lubricating oil supply passage, an oil supply groove 11 shown in FIG. 14 is formed at a joint between the lower bearing 2a and the upper bearing 2b, and a white metal 7 on the thrust sliding surface 6 is formed as shown in FIG. The indicated radiation groove 12 is engraved.

At both ends of the bearing housing 3, labyrinth seals 13 made of aluminum for sealing between the bearing housing 3 and the outer peripheral surface of the rotating shaft 1 are mounted. Between the labyrinth seal 13 and the rotating shaft 1, the floating of the rotating shaft 1 due to the generation of a lubricating oil film on the radial sliding surface 5, the whirling of the rotating shaft 1, and the thermal expansion of the rotating shaft 1 due to the temperature rise are considered. Thus, a relatively large gap is formed. In particular,
This gap is set to be about twice as large as the gap between the radial sliding surface 5 and the rotating shaft 1.

When the rotating shaft 1 rotates, the oil ring 9 rotates while slipping due to frictional force with the rotating shaft 1. Since the lower portion of the oil ring 9 is immersed in the lubricating oil 10, the lubricating oil adheres to the oil ring 9 and is transported upward to reach the rotating shaft 1 as the oil ring 9 rotates. The lubricating oil that has reached the rotating shaft 1 is then transferred to the lower bearing 2
The oil is supplied to the bearing gap D shown in FIG. The lubricating oil that has reached the radial sliding surface 5 of the lower bearing 2a generates a dynamic oil film pressure P according to the rotation speed of the rotating shaft 1, and the oil film pressure P resists the radial load W of the rotating shaft 1. Push up the rotating shaft 1.

Further, the lubricating oil is discharged to the end portion of the bearing width, that is, both ends in the axial direction by the oil film pressure P, and is mainly supplied to the thrust sliding surface 6 through the radial groove 12. The lubricating oil supplied to the thrust sliding surface 6 generates a dynamic oil film pressure against the thrust load of the rotating shaft 1 between itself and the side surface 1 b of the rotating shaft 1. The labyrinth seal 13 prevents leakage of lubricating oil from the gap between the bearing housing 3 and the rotating shaft 1. As described above, the self-lubricating bearing device supplies the lubricating oil to the radial sliding surface 5 and the thrust sliding surface 6 by using the rotational force of the rotating shaft 1, and thus has a simpler structure than the forced lubricating bearing device. Has the advantage that

[0008]

However, it can be said that the conventional self-lubricating bearing device described above does not form a sufficient lubricating oil film as compared with the forced lubricating bearing device, and is not necessarily excellent in wear resistance and the like. Since no white metal is used for the bearing sliding surface, the friction torque of the bearing sliding surface is large and the amount of wear is large, so large changes in the shape of the bearing sliding surface and wear marks are liable to occur. The function of forming an oil film is reduced, and the sliding surface of the bearing comes into solid contact with the rotating shaft, causing a sudden increase in frictional force. The heat generated causes white metal to melt and adhere to the rotating shaft, leading to a major accident. Such a problem exists.

In particular, in recent years, in order to improve the efficiency and reliability of rotating equipment, a small and high surface pressure self-lubricating bearing device capable of operating even in a state in which the bearing sliding area is small and the lubricating oil film is thin has been developed. Such small and high surface pressure self-lubricating bearing devices are basically required to have a thin lubricating oil film, and furthermore, it is difficult to form a lubricating oil film in the low-speed rotation region when starting and stopping the rotating shaft. Therefore, the above-mentioned problem becomes more apparent.

In a high-speed rotating device, the whirling of the rotating shaft increases, which increases the radial load and the thrust load, and reduces the oil film thickness on the radial sliding surface and the thrust sliding surface. Due to the inclination of the rotating shaft due to the alignment, a load is concentrated on the end of the bearing width, that is, both ends in the axial direction of the bearing, and the oil film there becomes very thin, so that the bearing is easily damaged.

In addition, the gap between the labyrinth seal and the rotary shaft of the conventional self-lubricating bearing device is set relatively large in consideration of the floating of the rotary shaft and the whirling of the rotary shaft, so that the sealing function deteriorates. However, there is also a problem that a relatively large amount of lubricating oil leaks.

Further, in the conventional self-lubricating bearing device, when the rotating shaft rotates at a high speed, the oil ring swings in the axial direction due to minute whirling of the rotating shaft, whereby the oil ring made of brass is used for the upper bearing made of iron. The side surface of the oil ring and the side surface of the oil ring guide groove are worn by colliding with the side surface of the oil ring guide groove, and metal wear powder is generated. This abrasion powder penetrates into the bearing sliding surface and damages the bearing.

An object of the present invention is to provide a self-lubricating bearing device having excellent wear resistance and reduced friction torque. An object of the invention described in claim 5 is to provide a self-lubricating bearing device that can prevent damage to a bearing even when a load is concentrated on both axial ends of the bearing due to a fall of a rotating shaft or the like. is there.

It is an object of the present invention to provide a self-lubricating bearing device capable of reducing generation of metal wear powder due to collision of an oil ring. An object of the invention described in claim 11 is to provide a self-lubricating bearing device capable of improving sealing performance between a bearing housing and a rotating shaft. An object of the invention described in claim 12 is to provide a method of manufacturing a self-lubricating bearing device having excellent wear resistance and reduced friction torque.

[0015]

In order to achieve the above object, the present invention is directed to a bearing housing for containing a lubricating oil, and a rotating shaft disposed in the bearing housing and extending horizontally. A self-lubricating bearing device comprising: a cylindrical radial bearing having a radial sliding surface rotatably supporting an outer periphery of a cylindrical fiber bearing, wherein a glass fiber filling layer is laminated on at least a part of the radial sliding surface of the cylindrical radial bearing. It is characterized by comprising a polytetrafluoroethylene member.

The glass fiber-filled polytetrafluoroethylene member is excellent in abrasion resistance and reduces friction torque, so that a lubricating oil film is easily formed on the radial sliding surface. Therefore, it is possible to prevent the cylindrical radial bearing from being damaged when the rotating shaft is started and stopped or during high-speed rotation.

According to a second aspect of the present invention, in the self-lubricating bearing device according to the first aspect, a porous layer is interposed between the glass fiber-filled polytetrafluoroethylene member and the cylindrical radial bearing. It is characterized by doing. The presence of the porous layer prevents compression creep and peeling of the glass fiber filled polytetrafluoroethylene member.

According to a third aspect of the present invention, in the self-lubricating bearing device according to the first aspect, the cylindrical radial bearing is composed of an upper bearing and a lower bearing divided into upper and lower parts, and the glass fiber-filled bearing is used. The polytetrafluoroethylene member is characterized in that it is laminated on the radial sliding surfaces of both the upper bearing and the lower bearing. Since the glass fiber filled polytetrafluoroethylene member is laminated on the radial sliding surfaces of both the upper bearing and the lower bearing, its wear resistance and low friction torque characteristics are exhibited in both the upper bearing and the lower bearing. You.

According to a fourth aspect of the present invention, in the self-lubricating bearing device according to the first aspect, the cylindrical radial bearing is composed of an upper bearing and a lower bearing divided into upper and lower parts, and the glass fiber-filled bearing is used. The polytetrafluoroethylene member is not laminated on the radial sliding surface of the upper bearing, but is laminated on the radial sliding surface of the lower bearing. The glass fiber-filled polytetrafluoroethylene member is laminated on the radial sliding surface of the lower bearing where the bearing sliding surface is easily damaged.

According to a fifth aspect of the present invention, in the self-lubricating bearing device according to the first aspect, the glass fiber-filled polytetrafluoroethylene member is provided with the radial slides at both axial ends of the cylindrical radial bearing. The radial sliding surface is laminated on a moving surface, and is not laminated on the radial sliding surface at a central portion in the axial direction of the cylindrical radial bearing. Since the glass fiber filled polytetrafluoroethylene member is laminated on the radial sliding surfaces at both axial ends of the cylindrical radial bearing, even if whirling of the rotating shaft occurs due to misalignment of the rotating shaft, the axial direction Prevents damage to radial sliding surfaces at both ends.

According to a sixth aspect of the present invention, in the self-lubricating bearing device according to the first aspect, a disk-type thrust bearing having a thrust sliding surface for thrust-bearing the rotating shaft; A glass fiber-filled polytetrafluoroethylene member laminated on the thrust sliding surface of the bearing. The glass fiber-filled polytetrafluoroethylene member has excellent wear resistance and reduces friction torque, so that a lubricating oil film is easily formed on the thrust sliding surface. Accordingly, it is possible to prevent the disk-type thrust bearing from being damaged when the rotating shaft is started and stopped or during high-speed rotation.

According to a seventh aspect of the present invention, in the self-lubricating bearing device according to the sixth aspect, the glass fiber filled polytetrafluoroethylene member laminated on the thrust sliding surface has a spiral groove and a tapered land. It is characterized in that one of the grooves is engraved. The spiral groove or the tapered land groove efficiently supplies the lubricating oil to the thrust sliding surface.

According to an eighth aspect of the present invention, there is provided the self-lubricating bearing device according to the sixth aspect, wherein the glass fiber filled polytetrafluoroethylene member laminated on the thrust sliding surface and the disc type thrust bearing are provided. A porous layer is interposed between the sliding surface and the thrust sliding surface. By interposing a porous layer between the thrust sliding surface and the glass fiber filled polytetrafluoroethylene member, compression creep and peeling of the glass fiber filled polytetrafluoroethylene member are prevented.

According to a ninth aspect of the present invention, in the self-lubricating bearing device according to the first aspect, a disk-type thrust bearing having a thrust sliding surface for thrust-bearing the rotating shaft; And a glass fiber-filled polytetrafluoroethylene member laminated on the sliding surface of the rotating shaft in contact with the thrust sliding surface of the bearing. Even if the glass fiber filled polytetrafluoroethylene member is laminated on the sliding surface of the rotating shaft in contact with the thrust sliding surface of the disk-type thrust bearing, instead of the thrust sliding surface, the same effect can be obtained.

The invention described in claim 10 is the first invention.
In the self-lubricating bearing device according to the above, an oil ring housed in an oil ring guide groove engraved on the radial sliding surface of the cylindrical radial bearing and supplying the lubricating oil to the radial sliding surface, And a glass fiber-filled polytetrafluoroethylene member laminated on both side surfaces of the oil ring. Because glass fiber filled polytetrafluoroethylene members are laminated on both sides of the oil ring,
Even if the oil ring collides with the side surface of the oil ring guide groove, the generation of wear powder from the side surface of the oil ring guide groove is reduced. Further, the abrasion powder generated from the glass fiber-filled polytetrafluoroethylene member has a lubricating effect and does not damage the bearing sliding surface.

The invention described in claim 11 is the first invention.
The self-lubricating bearing device according to the above, wherein a floating seal attached to the bearing housing and seals between the outer periphery of the rotating shaft and the bearing housing, and a glass fiber filled polytetra laminated on a sealing surface of the floating seal. And a fluoroethylene member. Since the glass fiber-filled polytetrafluoroethylene member is laminated on the sealing surface of the floating seal, the gap between the sealing surface and the outer peripheral surface of the rotating shaft can be set sufficiently small, reducing leakage of lubricating oil. can do.

According to a twelfth aspect of the present invention, there is provided a bearing housing accommodating a lubricating oil, and a radial sliding surface disposed in the bearing housing and rotatably supporting the outer periphery of a horizontally extending rotary shaft. A method for manufacturing a self-lubricating bearing device comprising: a cylindrical radial bearing having a porous layer fixed to the radial sliding surface of the cylindrical radial bearing; It is characterized in that the fluoroethylene member is pressure-formed. Since the porous layer is fixed to the radial sliding surface of the cylindrical radial bearing and then the glass fiber-filled polytetrafluoroethylene member is pressure-formed, compression creep and peeling of the glass fiber-filled polytetrafluoroethylene member are prevented. be able to.

The invention described in claim 13 is the first invention.
2. In the method of manufacturing a self-lubricating bearing device according to 2, the pressure molding of the glass fiber-filled polytetrafluoroethylene member is performed by simultaneously applying a plurality of divided molds to the glass fiber-filled polytetrafluoroethylene member. It is characterized by being performed by applying pressure. By simultaneously pressing a plurality of split molds, the glass fiber-filled polytetrafluoroethylene member can be pressed uniformly.

The invention described in claim 14 is the first invention.
2. The method of manufacturing a self-lubricating bearing device according to item 2, wherein the self-lubricating bearing device includes a disk-type thrust bearing having a thrust sliding surface that thrust-bears the rotating shaft, and the thrust of the disk-type thrust bearing is provided. A porous layer is fixed to the sliding surface, and then a glass fiber-filled polytetrafluoroethylene member is pressure-formed on the porous layer using a mold. To fix the porous layer on the thrust sliding surface of the disk-type thrust bearing, and then press-mold the glass fiber-filled polytetrafluoroethylene member on the porous layer using a mold, Compression creep and peeling of the fluoroethylene member can be prevented.

The invention described in claim 15 is the first invention.
4. In the method of manufacturing a self-lubricating bearing device according to 4, the die is provided with a spiral groove or a tapered land groove on a surface of the glass fiber-filled polytetrafluoroethylene member during the pressure molding. It is a feature. The spiral groove or the tapered land groove is formed at the same time as the glass fiber-filled polytetrafluoroethylene member is press-molded by a mold.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a self-lubricating bearing device and a method of manufacturing the same according to the present invention will be described below with reference to FIGS. I will explain. FIG. 1 shows a first embodiment of a self-lubricating bearing device according to the present invention. The rotating shaft 1 extending in the horizontal direction has a small diameter portion 1a, and the small diameter portion 1a is rotatably supported by a self-lubricating bearing 2 made of iron. The self-lubricating bearing 2 is composed of a lower bearing 2a and an upper bearing 2b which are divided into upper and lower parts, and is supported inside a bearing housing 3. The self-lubricating bearing 2 has a radial sliding surface 5 that supports the radial load of the rotating shaft 1 and a thrust sliding surface 6 that supports the thrust load of the rotating shaft 1. On the entire surface of the radial sliding surface 5, for example, a porous layer 14 composed of a multilayer punched plate, a wire layer, a ball layer, or the like and a glass fiber-filled polytetrafluoroethylene (hereinafter, referred to as
PTFE) member 15. Similarly, a porous layer 16 and a glass fiber-filled PTFE member 17 are also laminated on the thrust sliding surface 6. As shown in FIG. 2, a spiral groove 18 is formed in the thrust sliding surface 6, specifically, the glass fiber filled PTFE member 17.

An oil ring guide groove 8 is engraved on the radial sliding surface 5 at the center of the upper bearing 2b, and a pure gold oil ring 19 is inserted through the oil ring guide groove 8.
The oil ring 19 passes through the oil ring guide groove 8 while the upper part is in contact with the outer peripheral surface of the rotating shaft 1, and the lower part is immersed in the lubricating oil 10 in the bearing housing 3. As shown in FIG. 3 on an enlarged scale, the oil ring 19 has a porous layer 20 and glass fiber-filled PTFE members 2 on both sides thereof.
1 are stacked.

As shown in FIG. 1, floating seals 22 made of light metal such as aluminum are attached to both ends of the bearing housing 3 to seal between the bearing housing 3 and the outer peripheral surface of the rotary shaft 1. On the sealing surface of the floating seal 22, a porous layer 23 and a glass fiber filled PTFE member 24 are laminated. FIG. 4 shows a detailed structure of the floating seal 22. The floating seal 22 has a plurality of, in the illustrated example, four segments 22a.
The divided segments 22a, 22b, 22c, and 22d are surrounded by a coil spring 25 on their outer circumferences, and maintain a ring shape as a whole by the urging force of the coil spring 25. In addition, the floating seal 22 is attached to the bearing housing 3 by a detent pin 26. In this manner, the floating seal 22 is set in a state where the gap between the glass fiber filled PTFE member 24 and the outer peripheral surface of the rotating shaft 1 is set to be very small.
The rotating shaft 1 is sealed. The porous layers 16, 20, and 23 and the glass fiber-filled PTFE members 17, 21, and 24 laminated on the thrust sliding surface 6, the oil ring 19, and the floating seal 22, respectively, are made of the porous layer 14 and the glass fiber-filled PTFE members. It is made of the same material as the PTFE member 15. The other configuration is the same as the configuration shown in FIGS.

Next, the operation of the first embodiment will be described. When the rotating shaft 1 rotates, the oil ring 19 rotates with a slip due to the frictional force with the rotating shaft 1, and transfers the lubricating oil 10 in the bearing housing 3 to the radial sliding surface 5. The lubricating oil that has reached the radial sliding surface 5 is
A dynamic oil film pressure corresponding to the rotation speed of the rotating shaft 1 is generated, and this oil film pressure pushes up the rotating shaft 1 against the radial load of the rotating shaft 1. Due to the oil film pressure, the lubricating oil is discharged to the end portion of the bearing width, that is, to both end portions in the axial direction, and mainly to the spiral groove 18.
Is supplied to the thrust sliding surface 6. The lubricating oil supplied to the thrust sliding surface 6 generates a dynamic oil film pressure against the thrust load of the rotating shaft 1 between itself and the side surface 1 b of the rotating shaft 1. The spiral groove 18 generates a large oil film pressure on the thrust sliding surface 6 by the dynamic pumping action of the fluid by the rotation shaft 1 at the time of high speed rotation of the rotation shaft, and makes the oil film sufficiently thick. Therefore, a large thrust load can be supported, and vibration in the thrust direction of the rotating shaft 1 can be suppressed. In addition, since the gap between the glass fiber filled PTFE member 24 and the outer peripheral surface of the rotary shaft 1 is set to be sufficiently small, the floating seal 22 can reliably prevent the leakage of the lubricating oil.

Next, the function or action of the glass fiber filled PTFE members 15, 17, 21, 24 will be described. FIG. 5 is a graph comparing the friction and wear characteristics of glass fiber filled PTFE with the friction and wear characteristics of other materials including white metal. This graph shows the results of an experiment in which the friction and wear characteristics of various sliding materials in lubricating oil were measured using a ring-on-disk friction / wear tester. As is clear from this graph, the glass fiber-filled PTFE is superior in friction and wear characteristics to PTFE filled with other fillers, and compared to white metal used in conventional self-lubricating bearings. It is much better. Specifically, the glass fiber-filled PTFE has a wear amount of 1/50 or less and a frictional force of 1/5 or less as compared with white metal. Further, the glass fiber-filled PTFE member 15 is an elastic material having excellent adhesion resistance.

Therefore, since the radial sliding surface 5 is laminated with the glass fiber filled PTFE member 15, the wear resistance in the low-speed rotation region when the rotating shaft 1 is started and stopped is high, and the friction torque is low. The lubricating oil film can be easily formed, and the radial sliding surface 5 can be reduced in size and increased in surface pressure. Due to the small size and high surface pressure of the radial sliding surface 5, the lubricating oil film generation pressure at the rated rotation speed exhibits a high pressure.
Since the oil film is elastically deformed in accordance with the oil film pressure, the oil film pressure distribution is smoothed by the elastic deformation, the oil film becomes thicker as a whole, and stable operation becomes possible. Further, the glass fiber-filled PTFE member 15 has a sliding surface of the rotating shaft 1 made to have a mirror-like surface due to the contact with the rotating shaft 1 and also has an anti-adhesion property, so that a stable operation becomes possible.

The glass fiber filled PTFE member 17 formed on the thrust sliding surface 6 via the porous layer 16 is also
It has exactly the same function or function as the glass fiber-filled PTFE 15.

The oil ring 19 largely swings in the axial direction as shown by the arrow in FIG. 3 due to minute radial vibration of the rotating shaft 1 during high-speed rotation, and the swing causes the side surface 8a of the oil ring guide groove 8 to move. Crash into. However, since the oil ring 19 is formed by laminating the glass fiber filled PTFE member 21 having excellent wear resistance and low frictional force on both sides thereof, no metal wear powder is generated from the oil ring 19 and the oil ring guide groove is formed. The generation of metal abrasion powder from the side surface 8a of the metal plate 8 is extremely reduced. Further, the abrasion powder of the glass fiber-filled PTFE member 21 itself has a lubricating effect, so that mixing it with the lubricating oil 10 has no adverse effect.

Further, the floating seal 22 is formed by laminating a glass fiber-filled PTFE member 24 having excellent wear resistance and low frictional force on the sealing surface thereof.
And the gap can be set sufficiently small. FIG. 6 shows a second embodiment of the self-lubricating bearing device according to the present invention. In the lower bearing 2a, a PTFE member 15 filled with glass fiber is laminated via the porous layer 14 only at the center of the radial sliding surface, that is, the lowermost region, and white metal is formed on the remaining portion of the radial sliding surface. 7 are fusion bonded. Although the upper bearing 2b is not shown, a white metal 7 is fusion-bonded to the entire surface of the radial sliding surface. As described above, the second embodiment is different from the first embodiment in that the PTFE member 15 filled with the glass fiber is provided via the porous layer 14 only in the lowermost region of the radial sliding surface where the radial load from the rotating shaft 1 acts intensively. Are laminated.

Also in this embodiment, since the PTFE member 15 filled with glass fiber is elastically deformed, it is easy to form a lubricating oil film. Therefore, the oil film thickness Hn in this embodiment is larger than the oil film thickness Ho of the conventional self-lubricating bearing device shown in FIGS. 13 and 14, and the oil film pressure Pn is larger than that of the conventional self-lubricating bearing device. It becomes uniform and smaller than the oil film pressure Po.

FIG. 7 shows a third embodiment of the self-lubricating bearing device according to the present invention. On the radial sliding surface 5 of the lower bearing 2a, a PTFE member 15 filled with glass fiber is laminated on both ends in the axial direction via a porous layer 14, and the remaining portion of the radial sliding surface 5, that is, in the axial direction. A white metal 7 is fusion-bonded to the center of the. FIG. 7 shows only the lower bearing 2a and the upper bearing 2a.
Although not shown in the drawing, a porous layer 14 and a glass fiber-filled PTFE member 15 are laminated on both axial ends of the radial sliding surface of the upper bearing 2b, similarly to the lower bearing 2a. The white metal 7 is laminated at the center in the direction.

As described above, the PTFE member 15 filled with glass fiber is laminated on both ends of the bearing 2 in the axial direction, and the white metal 7 is laminated on the central portion of the bearing 2 in the axial direction. This is effective when the bearing 2 is concentrated on both ends in the axial direction due to whirling of the rotating shaft 1 due to misalignment of the shaft 1 or the like. The oil film pressure in the case of the present embodiment is smaller than the conventional maximum oil film pressure Po,
It is the maximum Pn, which is more uniform than before.

FIGS. 8 and 9 show a fourth embodiment of the self-lubricating bearing device according to the present invention. The thrust sliding surface 6 is filled with glass fiber filled P through a porous layer 16.
The TFE members 17 are stacked. The glass fiber-filled PTFE member 17 is provided with a tapered land groove 27 instead of the spiral groove 18 shown in FIG. The tapered land groove 27 is formed in the land portion 27 which is the uppermost flat portion.
a, a tapered portion 27b inclined downward from the land portion 27a, and a groove portion 27c which is the lowermost portion.
The tapered land groove 27 having such a configuration also has the same operation as the spiral groove 18 in FIG.

FIG. 10 shows a fifth embodiment of the self-lubricating bearing device according to the present invention. Upper and lower bearing 2
A porous layer 14 and a glass fiber-filled PTFE member 15 are laminated on the radial sliding surface 5 of the upper and lower bearings 2a and 2b. And glass fiber filled P
TFE members are not laminated, upper and lower bearings 2
Iron, which is the material of a and 2b, is exposed as it is. A glass fiber filled PTFE member 29 is laminated on a side surface 1 b of the rotating shaft 1 facing the thrust sliding surface 6 via a porous layer 28. As described above, by laminating the porous layer 28 and the glass fiber filled PTFE member 29 on the side surface 1b of the rotating shaft 1 facing the thrust sliding surface 6, the case where the porous layer 28 and the glass fiber filled PTFE member 29 are laminated on the thrust sliding surface 6 can be obtained. An equivalent effect can be achieved. In addition, such a configuration,
There is an advantage that the configuration of the thrust bearing portion of the bearing device can be simplified.

FIG. 11 shows an embodiment of a method of manufacturing a self-lubricating bearing device according to the present invention. Iron lower bearing 2a
On the radial sliding surface 5, a porous layer 14 composed of, for example, a multilayer punched plate, a wire layer, a ball layer, or the like is fixedly joined. This bonding is performed by brazing with a low melting point metal such as silver brazing, HIP or liquid phase sintering. Thereafter, a glass fiber-filled PTF is formed on the porous layer 14.
The E member 15 is pressed and fired and joined.

In this pressure molding, a semi-cylindrical mold 30 is placed on the glass fiber filled PTFE member 15,
The plate-like pressing plate 31 on the die 30 is placed the performed by pressurizing the pressing plate 31 with a load W ₀ from the press. The semi-cylindrical mold 30 is divided into a plurality,
In the illustrated example, it is constituted by three divided molds 30a, 30b, 30c, and each of the cross sections of these divided molds 30a, 30b, 30c is a sector having a central angle of about 60 ° as shown. Applied force by the application of the heavy _{W 0,} split mold 30a,
30b and 30c mutually slip in the direction of arrow A,
Due to this slip, the pressing loads W ₁ , W ₂ , W ₃ by the split molds 30a, 30b, 30c become substantially equal, and the glass fiber filled PTFE member 15 is uniformly pressed.
Thus, the glass fiber-filled PTFE member 15 having a substantially uniform thickness and strength is laminated over the entire radial sliding surface 5 of the lower bearing 2a.

For the upper bearing 2b, the porous layer 14 and the glass fiber-filled PTF are formed in exactly the same manner.
The E member 15 is stacked. FIG. 12 shows the thrust sliding surface 6.
Layer 16 and PTFE member 1 filled with glass fiber
7 shows a method of laminating No. 7.

After the porous layer 16 is fixedly joined to the thrust sliding surface 6 of the bearing 2 as in the case of the radial sliding surface 5,
A glass fiber-filled PTFE member 17 is formed on the porous layer 16 by pressure molding and firing. This pressure molding is performed by pressing the glass fiber filled PTFE member 17 with a convex spiral groove mold 32. The convex spiral groove mold 32 is provided with the spiral groove 18 shown in FIG.
Is formed in the glass fiber filled PTFE member 17 at the same time as the pressure molding. Of course, the tapered land groove 27 shown in FIG. 9 can be formed by changing the shape of the mold 32.

The self-lubricating bearing device of the above embodiment has a configuration including both a radial bearing and a thrust bearing. However, the present invention is also applicable to a self-lubricating bearing device having only a radial bearing. Further, in the self-lubricating bearing device of the above embodiment, each of the glass fiber filled PTFE members 15, 17, 21, 24, 29 has a sliding surface or the like via the porous layers 14, 16, 20, 23, 28. However, according to the present invention, the glass fiber-filled PTFE member can be directly laminated on a sliding surface or the like without passing through the porous layer. Further, the present invention provides a glass fiber filled PTFE member 15, 17,
21, 24, 29 and the porous layers 14, 16, 20, 23,
Further, another material may be interposed between the first and second members.

[0050]

As is apparent from the above description, claim 1
According to the invention described in the above, glass fiber filled PT
Since the FE member is laminated on at least a part of the radial sliding surface of the cylindrical radial bearing, the wear resistance and low friction torque of the radial sliding surface are greatly improved, thereby preventing damage to the bearing. Can be. According to the invention described in claim 5, the glass fiber filled PTFE member is laminated on the radial sliding surfaces at both ends in the axial direction of the cylindrical radial bearing. Even when a radial load is concentrated on both axial ends of the bearing, damage to the bearing can be prevented. According to the invention described in claim 10, glass fiber filled PTF
Because the E member is laminated on both sides of the oil ring,
Generation of wear powder from the oil ring guide groove can be greatly reduced, and damage to the bearing due to the wear powder can be prevented.

According to the eleventh aspect of the present invention, the floating seal is used, and the glass fiber filled PTFE member is laminated on the sealing surface of the floating seal. The gap with the outer peripheral surface can be set very small, so that leakage of lubricating oil can be reliably prevented.

According to the twelfth aspect of the present invention, the porous layer is fixed on the radial sliding surface of the cylindrical radial bearing, and then the glass fiber-filled PTFE member is pressure-formed. Compression creep and peeling of the member can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing a first embodiment of a self-lubricating bearing device according to the present invention.

FIG. 2 is a side view showing a thrust sliding surface of the first embodiment.

FIG. 3 is an enlarged sectional view showing an oil ring guide groove of the first embodiment.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a graph showing the friction and wear characteristics of a material.

FIG. 6 is a sectional view schematically showing a second embodiment of a self-lubricating bearing device according to the present invention.

FIG. 7 is a sectional view schematically showing a third embodiment of a self-lubricating bearing device according to the present invention.

FIG. 8 is a side view schematically showing a fourth embodiment of a self-lubricating bearing device according to the present invention.

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

FIG. 10 is a sectional view schematically showing a fifth embodiment of a self-lubricating bearing device according to the present invention.

FIG. 11 is a sectional view showing an embodiment of a method of manufacturing a self-lubricating bearing device according to the present invention.

FIG. 12 is a sectional view showing an embodiment of a method of manufacturing a self-lubricating bearing device according to the present invention.

FIG. 13 is a sectional view schematically showing a conventional self-lubricating bearing device.

FIG. 14 is a sectional view taken along the line XIV-XIV of FIG. 13;

FIG. 15 is a side view showing a thrust sliding surface of a conventional self-lubricating bearing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotary shaft 2 Self-lubricating bearing 2a Lower bearing 2b Upper bearing 3 Bearing housing 5 Radial sliding surface 6 Thrust sliding surface 8 Oil ring guide groove 14, 16, 20, 23, 28 Porous layer 15, 17, 21, 24 , 29 Glass fiber filled PTFE member 19 Oil ring 22 Floating seal

Claims (15)

[Claims] 1. A bearing housing for storing lubricating oil, and a cylindrical radial bearing having a radial sliding surface rotatably supporting an outer periphery of a horizontally extending rotary shaft, which is disposed in the bearing housing. A self-lubricating bearing device, comprising: a glass fiber-filled polytetrafluoroethylene member laminated on at least a part of the radial sliding surface of the cylindrical radial bearing. 2. The self-lubricating bearing device according to claim 1, wherein a porous layer is interposed between the glass fiber filled polytetrafluoroethylene member and the cylindrical radial bearing. 3. The cylindrical radial bearing comprises an upper bearing and a lower bearing divided into upper and lower parts, and the glass fiber-filled polytetrafluoroethylene member is provided on the radial sliding surfaces of both the upper bearing and the lower bearing. The self-lubricating bearing device according to claim 1, wherein the self-lubricating bearing device is laminated. 4. The cylindrical radial bearing comprises an upper bearing and a lower bearing which are divided into upper and lower parts. The glass fiber filled polytetrafluoroethylene member is not laminated on the radial sliding surface of the upper bearing. The self-lubricating bearing device according to claim 1, wherein the self-lubricating bearing device is laminated on a radial sliding surface of the lower bearing. 5. The glass fiber-filled polytetrafluoroethylene member is laminated on the radial sliding surfaces at both ends in the axial direction of the cylindrical radial bearing, and is provided at the central portion in the axial direction of the cylindrical radial bearing. The self-lubricating bearing device according to claim 1, wherein the self-lubricating bearing device is not laminated on the radial sliding surface. 6. A disk-type thrust bearing having a thrust sliding surface for thrust-bearing the rotating shaft, a glass-fiber-filled polytetrafluoroethylene member laminated on the thrust sliding surface of the disk-type thrust bearing. The self-lubricating bearing device according to claim 1, further comprising: 7. The glass fiber-filled polytetrafluoroethylene member laminated on the thrust sliding surface has one of a spiral groove and a tapered land groove engraved thereon. Self-lubricating bearing device. 8. A porous layer is interposed between the glass fiber filled polytetrafluoroethylene member laminated on the thrust sliding surface and the thrust sliding surface of the disc type thrust bearing. The self-lubricating bearing device according to claim 6. 9. A disk-type thrust bearing having a thrust sliding surface for thrust-bearing the rotating shaft, and a sliding surface of the rotating shaft contacting the thrust sliding surface of the disk-type thrust bearing. The self-lubricating bearing device according to claim 1, further comprising a glass fiber-filled polytetrafluoroethylene member. 10. An oil ring guide groove engraved on said radial sliding surface of said cylindrical type radial bearing,
The oil ring according to claim 1, further comprising: an oil ring for supplying the lubricating oil to the radial sliding surface; and a glass fiber-filled polytetrafluoroethylene member laminated on both side surfaces of the oil ring. Self-lubricating bearing device. 11. A floating seal mounted on the bearing housing and sealing between the outer periphery of the rotating shaft and the bearing housing, and a glass fiber-filled polytetrafluoroethylene member laminated on a sealing surface of the floating seal. The self-lubricating bearing device according to claim 1, further comprising: 12. A bearing housing for accommodating a lubricating oil, and a cylindrical radial bearing having a radial sliding surface disposed in the bearing housing and rotatably supporting the outer periphery of a horizontally extending rotary shaft. In a method of manufacturing a self-lubricating bearing device, a porous layer is fixed to the radial sliding surface of the cylindrical radial bearing, and then a glass fiber-filled polytetrafluoroethylene member is pressure-formed on the porous layer. A method of manufacturing a self-lubricating bearing device, characterized in that: 13. The glass fiber-filled polytetrafluoroethylene member is pressure-formed by simultaneously pressing a plurality of divided molds against the glass fiber-filled polytetrafluoroethylene member. The method for manufacturing a self-lubricating bearing device according to claim 12. 14. The self-lubricating bearing device includes a disk-type thrust bearing having a thrust sliding surface for thrust-bearing the rotating shaft, and a porous layer is provided on the thrust sliding surface of the disk-type thrust bearing. 2. The glass fiber-filled polytetrafluoroethylene member is pressure-molded on the porous layer using a mold, and then the mold is pressed.
3. The method for manufacturing a self-lubricating bearing device according to item 2. 15. The mold according to claim 14, wherein the mold has a spiral groove or a tapered land groove formed on the surface of the glass fiber-filled polytetrafluoroethylene member during the pressure molding. Manufacturing method of self-lubricating bearing device.