JPH0819210A - Bearing device - Google Patents

Abstract

PURPOSE:To provide a long-life bearing device by preventing the shortage of of the lubricating oil of the bearing device by collecting a lubricating oil which comes out of an oil retaining bearing. CONSTITUTION:Ring-form oil retaining sintered resins 21, 27, 31 are disposed around the oil retaining bearing 21 of a shaft 20, and oil cutting means 33, 34 are provided in the shaft 20 on the upper and lower sides of the bearing 21 to collect a lubricating oil into the bearing 21, thereby achieving the long life of a bearing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device having a bearing for supporting a shaft.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a bearing device used in a conventional electric motor described in Japanese Utility Model Laid-Open No. 60-174453 and Japanese Utility Model Laid-Open No. 5-43761. A bearing supporting portion 3 is integrally formed with the body 2, a bearing 4 is arranged on the bearing supporting portion 3, and an oil-impregnated member 5 made of a felt material is brought into contact with the periphery of the bearing 4, and a metal pressing spring 6 is provided.
After forming the bearing portion 8 with the metal cover 7, the rotating shaft 11 having the collar 9 and the washer 10 inserted therein is supported by the bearing 4, and the washer 10 is brought into contact with the bearing 4 at this time. With this structure, it is not necessary to supply lubricating oil to the bearing 4 from the outside.

Further, as shown in FIG. 7, a housing 4 of an electric motor 1 holds a bearing 4, and the oil-impregnated member 5 is circumscribed around the bearing 4.
Is provided, an oil recovery member 12 made of a felt material is provided so as to surround the rotary shaft 11 in the direction of the rotary shaft 11 inserted into the bearing 4 so as to be adjacent to the oil impregnated member 5, and is further surrounded by the oil recovery member 12. It is known that the oil removing collar 12a is attached to the rotary shaft 11, the lubricating oil is scattered from the oil removing collar 12a to collect the lubricating oil, and the external lubrication of the bearing 4 is not necessary (for example, 62-149
50, JP-A-4-244758, etc.).

[0004]

In the conventional bearing device as described above, there is a problem that the bearing 4 is burnt and the life of the bearing is shortened if the lubricating oil is not reduced to the bearing 4, or if the amount of reduction is small. is there. That is, the reason why the lubricating oil is not reduced to the bearing 4 is that the lubricating oil drips out of the bearing 4 and does not flow back, but if dust or the like adheres to the shaft, it prevents circulation of the lubricating oil. It will be stopped and will further promote non-reduction. In particular, when the oil impregnation member 5 and the oil recovery member 12 are made of felt material as in the above-mentioned conventional example, fluff is easily generated from the felt material, and the fluff adheres to the rotating shaft 11 side together with other dust. There is a problem in that the oil that has come out of the bearing is prevented from scattering to the oil recovery member 12 side, and the oil recovery efficiency is further reduced. Therefore, there is a problem in that the amount of lubricating oil supplied to the bearing 4 is reduced, resulting in shortening the life of the bearing device.

Further, depending on the installation posture of the electric motor 1, oil may be transmitted to the outside of the electric motor 1 along the rotary shaft 11, and thus the amount of oil supplied to the bearing may be insufficient and the life of the bearing device may be shortened. was there.

The present invention has been made in order to solve the above-mentioned conventional problems, and in a bearing device that does not require oiling of the bearing, prevents a decrease in oil recovery efficiency due to generation of fluff or dust, An object of the present invention is to provide a bearing device that can have a longer life. Another object of the present invention is to provide a bearing device having a longer life by preventing the lubricating oil of the bearing from flowing out of the bearing device. Another object of the present invention is to provide a bearing device which can prevent the generation of fluff and dust to prolong the life of the bearing and reduce the number of parts.

[0007]

To this end, the present invention comprises a bearing made of a porous oil-impregnated material for holding a rotating shaft and a holding member for holding the bearing at a predetermined position. It is characterized in that an oil-impregnable resin member that abuts against the shaft and collects the oil discharged from the shaft and returns it to the bearing is attached to the holding member.

Further, a bearing made of a porous oil-impregnated material for holding the rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. And a second member axially contacting the first member and located around the shaft, the first and second members being made of a porous resin capable of containing oil. It is characterized by being configured.

Further, it is characterized in that the contact surfaces of the first member and the second member are in contact with each other in an uneven shape.

Further, the present invention is characterized in that the first member and the second member are constituted by a single member.

Further, a bearing made of a porous oil-impregnated material for holding a rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. Member, which is in contact with the first member in the axial direction, and is in contact with the oil-impregnating means that is located around the shaft and is capable of impregnating oil, and the surface on the shaft side of the oil-retaining device, and surrounds the shaft. 2 members, and the first and second members are each made of an oil-containing porous resin.

Further, the surface of the second member facing the shaft is characterized in that the part farther from the bearing is closer to the shaft than the part closer to the bearing.

Further, a bearing made of a porous oil-impregnated material for holding the rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. And a second member that axially contacts the first member and is located around the shaft, and the first and second members are each porous and contain lubricating oil. A second member is provided on both end surfaces of the first member in the axial direction of the first member so as to sandwich the first member, and the shafts at positions facing the respective second members are Oil removing means for cutting off the lubricating oil adhering to the shaft are provided around the shaft.

[0014]

When the holding member is provided with an oil-impregnated porous resin member that collects the oil coming out of the shaft by contacting the bearing and returning it to the bearing, the resin member does not fluff like a felt material and does not dust. Is not generated, so that fluff etc. do not adhere to the rotating shaft. Further, the oil discharged from the shaft returns from the resin member to the bearing due to the capillary phenomenon, so that the oil supply work to the bearing is unnecessary.

Further, it comprises a first member and a second member,
In the case where the first and second members are each made of a porous resin capable of containing oil, unlike the felt material, the first and second members do not fluff, so that the fluff does not adhere to the rotating shaft. Further, since the oil that has come out of the shaft returns from the resin member to the bearing due to the capillary phenomenon, it is not necessary to supply oil to the bearing. Furthermore, the first and second members can be manufactured separately, and it is easy to form a complicated shape.

Further, since the contact surfaces of the first member and the second member are in contact with each other in an uneven shape, the contact area can be made larger than that in which the single planes contact each other, and the recovery of oil is further improved. It will be easy.

Further, in the case where the first member and the second member are constituted by a single member, the number of parts is further reduced, the manufacturing process is simplified, and at the same time, the oil can be easily returned to the bearing. Becomes

In addition, in the case where the oil impregnating means and the second member which come into contact with the first member in the axial direction are provided, the first and second members do not fluff like the felt material, and therefore fluff or the like is not generated. Does not adhere to the rotating shaft. Furthermore, the oil that comes out of the shaft returns from the resin member to the bearing due to the capillary phenomenon,
No need to refuel the bearings. Further, since the oil impregnating means is separated from the shaft, a conventional felt or the like can be used for this oil impregnating means.

Further, of the surface of the second member facing the shaft, the portion farther from the bearing is closer to the shaft than the portion on the bearing side, so that the oil scattered from the shaft can be easily collected. , Contamination of other equipment is reduced.

A second member is provided on both end surfaces of the first member in the axial direction so as to sandwich the first member, and the shafts at the positions facing the respective second members are connected to this shaft. In the case where each of the oil removing means for cutting off the adhered lubricating oil is provided, when the shaft rotates, the lubricating oil is moved to the second member by the oil removing means by the centrifugal force, and the recovery of the lubricating oil is facilitated.
Further, since the second member and the oil draining means are present on both sides in the axial direction of the bearing, when the bearing device is used vertically, no matter which of the shafts is positioned above, leakage of lubricating oil from the bearing or the like is prevented. Easy to prevent.

[0021]

EXAMPLES Examples in which the bearing device of the present invention is used in an electric motor will be described below. Example 1. In FIG. 1, reference numeral 20 denotes a shaft of an electric motor, which is supported by a bearing 21 made of a porous oil-impregnated material. The bearing 21 is made of sintered metal in this embodiment, and is held in the housing 2 of the electric motor 2 by a circular upper plate 22 and a middle plate 23 as a holding member and a bracket 23. The upper plate 22 and the middle plate 23 are provided with holes 25 at four locations, respectively.

On the outer peripheral side of the bearing 21, a resin member 26 as a first member made of an annular sintered resin and containing lubricating oil is in contact, and this sintered resin is a sintered metal. A similar manufacturing method, that is, it is manufactured by heating and compressing a granular resin, has a large number of fine small holes, and lubricating oil is contained in advance in the small holes.

Reference numeral 27 denotes a resin member as a second member, which is made of the same material as the resin member 26. The resin member 27 has a convex portion 28 that penetrates the hole 25 of the middle plate 23.
Are provided in four places on the upper surface and are held by the lower plate 29. The tip of the convex portion 28 is fitted into the concave portion 30 formed at the corresponding position on the resin member 26. Three
Reference numeral 0 denotes a resin member made of the same material as the resin members 26 and 27, which has four convex portions 32 penetrating the hole 25 of the upper plate 22 at its lower end and is held by the upper plate 22 and the bracket 24. Further, like the convex portion 25, the convex portion 32 has its tip fitted into the concave portion 30 on the upper surface of the resin member 26. The convex portion 28 and the concave portion 30 of the resin member may be reversed. That is, it is possible to eliminate the convex portion 28 formed on the resin members 27 and 31 and replace it with the concave portion 30 and eliminate the concave portion 30 of the resin member 26 and replace it with the convex portion 28.

Reference numeral 33 denotes an annular collar as an oil removing means, which is made of rubber in the present embodiment and closely surrounds the circumference of the shaft 20 so as to face the inner wall surface of the resin member 27. It is located in. 34 is also an annular collar as a color oil removing means, and is positioned so as to face the inner wall surface of the resin member 31. Axis 2 of lower plate 29
The end edge 29a facing 0 is closer to the shaft 20 than the end edge 33a of the collar 33 extending from the shaft 20. With this configuration, even if the lubricating oil dripping from the collar 33 is received.

In the bearing device having the above structure, the resin member 26
The lubricating oil contained in is transmitted to the bearing 21 made of sintered metal by the capillary phenomenon, and is transmitted from the bearing 21 to the shaft 20. If the shaft 20 is installed vertically and stopped without rotating, the lubricating oil is transmitted from the shaft 20 through the collar 33, and the lower plate 29
Drop on. When the shaft 20 rotates, the lubricating oil is blown to the inner wall surface of the resin member 27 directly from the shaft 20 or through the collar 33 by the centrifugal force. The lubricating oil transmitted to the resin member 27 is sucked by the capillary phenomenon of the resin member 27 and returned to the resin member 26.

When the lubricating oil oozing from the shaft 20 reaches the upper side of the collar 34, the lubricating oil is similarly spilled from the collar 34 to the resin member 31, and due to the capillary phenomenon of the resin member 31, the lubricating oil is discharged. It is returned to the 26 side.

According to the above bearing device, since the resin members 26, 27, 31 for reducing the lubricating oil to the bearing 20 are the resin which is porous and contains the lubricating oil, it is fluff like the conventional felt. Is not generated, it is possible to eliminate the factor that obstructs the circulation of the lubricating oil, improve the oil recovery efficiency, and prevent the life of the bearing device from being shortened due to running out of the lubricating oil. Further, since the resin member is significantly easier to form as compared with the felt, various shapes can be appropriately realized, and it is extremely useful as an oil recovery means particularly used for a bearing device such as a small electric motor. Further, since the resin members 27 and 31 are located on both axial end surfaces of the resin member 26, it is possible to prevent the lubricating oil from flowing out of the bearing device. Further, since the convex portions 28 and 32 of the resin members 27 and 31 enter the concave portions 30 and 30 of the resin member 26 and have a large contact area with each other, the lubricating oil can be more reliably reduced.

Embodiment 2 FIG. FIG. 3 shows the resin member 2 of the first embodiment.
7 shows a configuration having an overhanging portion 35 in which the resin member 27 is projected along the overhanging edge 33a, and other configurations show a bearing device that is the same as that of the above-described embodiment. That is, of the inner wall surface of the resin member 27 facing the shaft, the portion farther from the bearing is closer to the shaft than the portion closer to the bearing, and the protruding portion is larger than the diameter of the collar 33. The diameter of the space formed by 35 is smaller. With this configuration, the shaft 20 is installed vertically, and even if the lubricating oil drops from the collar 33 when the shaft 20 is not rotating, the resin member 27 can immediately absorb the lubricating oil, and the lubricating oil can be transferred to the outside of the bearing device. Outflow can be well prevented.

Example 3. FIG. 4 shows a bearing device in which the resin members 26 and 27 in the first embodiment are formed of an integral resin member 37. The integral resin member 37 directly holds the bearing 21, but the resin member 37 itself is held by the bracket 38. In the figure, 39 is a notch formed as an oil removing means on the shaft 20, and when the shaft 20 rotates, the lubricating oil transmitted to this notch 39 is directly applied to the inner wall surface of the resin member 37 by centrifugal force. It is skipped and absorbed. According to the bearing device having this configuration, the number of parts is reduced, and the assembly can be made extremely easy. Moreover, since the resin member 37 does not fluff like ferrite and rarely adheres to the shaft 20 as dust, the inner wall surface of the resin member 37 that directly faces the shaft 20 is as close as possible to the shaft 20. It is possible to bring the same into close proximity to, and it is possible to further improve the recovery efficiency of the lubricating oil. Although the resin member 31 (of the first embodiment) above the bearing 21 is not provided in this embodiment, the resin member 31 is not provided.
May be integrally formed as the resin member 37.

Example 4. FIG. 5 shows the resin member 2 of the first embodiment.
Instead of No. 7, an annular felt 40 is provided as an oil impregnating means, and a thin annular resin member 41 is closely provided on the felt 40 on the inner wall surface side of the felt 40. That is, the convex portions 43 are evenly arranged at four positions on the upper end surface of the felt 40 and are in contact with the lower end surface of the resin member 26. The felt 40 is held by the bracket 42. A stop ring 44 is provided in the notch 39 of the shaft 20 and fixes the collar 45. Other configurations are basically the same as those of the first embodiment except that the resin member 31 (of the first embodiment) is not provided.

According to this embodiment, a resin member thinner than the resin member 27 of the first embodiment is sufficient, so that the manufacturing cost can be reduced, and even if felt is used, the felt 40 can be used.
Is isolated from the shaft 20, it contributes to prolonging the life of the bearing device without fear of reducing the recovery efficiency of the lubricating oil. In addition, the concave portion 30 is formed on the lower end surface of the resin member 26 in the present embodiment.
However, the lubricating oil can be circulated only by bringing the convex portion 43 into contact with the lower end surface without providing the concave portion 30.

[0032]

As described above, in the case where the holding member is provided with the oil-containing porous resin member that comes into contact with the bearing, collects the oil that has come out of the shaft, and returns it to the bearing, the capillarity phenomenon is generated from the resin member. Since it returns to the bearing by the above, it is not only necessary to refuel the bearing, but also the resin material does not fluff like felt material and does not generate dust, so fluff does not adhere to the shaft and interferes with the oil recovery function. Can eliminate the factors that
This has the effect of extending the life of the bearing.

Further, the first member and the second member are provided,
In the case of the resin made of oil-containing porous resin, the second member returns to the bearing through the first member due to the capillary phenomenon, so that the oiling work to the bearing can be made unnecessary, and the first and second Unlike the felt material, the second member does not fluff and does not generate dust, so that fluff or the like does not adhere to the shaft, a factor that interferes with the oil recovery function can be eliminated, and the life of the bearing can be extended. Furthermore, since the first and second members can be manufactured separately, it is easy to form a complicated shape and the degree of freedom in designing the bearing is increased. The mold for molding the second member can be easily processed, and the cost can be reduced.

Further, since the abutting surfaces of the first member and the second member are in contact with each other in an uneven shape, the contact area can be made larger than that in which flat surfaces simply contact, and oil recovery is easier. Has the effect.

Further, in the case where the first member and the second member are constituted by a single member, the number of parts can be reduced, the manufacturing process can be simplified, and at the same time, the oil can be prevented from returning to the bearing. Since there is nothing to do, it has an effect of realizing high oil recovery efficiency that facilitates oil reduction. Therefore, there is an effect that the automatic manufacture of a particularly small electric motor can be facilitated.

Further, in the case where the second member is provided with the oil impregnating means that comes into axial contact with the first member, the second member returns to the bearing through the oil impregnating member and the first member due to the capillary phenomenon. Not only can lubrication of bearings be unnecessary, but the first and second members do not fluff like felt materials and do not generate dust, so fluff does not adhere to the shaft and interferes with the oil recovery function. This has the effect of eliminating the factor causing the increase in the life of the bearing. Moreover, the oil impregnating means is kept away from the shaft, and even if fluff or the like is scattered, the oil impregnating means does not directly adhere to the shaft. Therefore, a conventional felt or the like can be used for this oil impregnating means, and the porous resin can be used more effectively. It has an effect that it can be a small amount.

Further, of the surface of the second member facing the shaft, the part farther from the bearing is closer to the shaft than the part on the bearing side, so that the oil scattered from the shaft can be easily collected. Therefore, it is possible to reduce the pollution of other devices.

Further, a second member is provided on both axial end faces of the first member so as to sandwich the first member, and the shafts at the positions facing the respective second members are attached to this shaft. In the case where each of the oil removing means for cutting off the adhered lubricating oil is provided, when the shaft rotates, the lubricating oil is moved to the second member by the oil removing means by the centrifugal force, so that the lubricating oil can be easily collected,
Further, since the second member and the oil draining means are present on both sides in the axial direction of the bearing, when the bearing device is used vertically, no matter which of the shafts is positioned above, leakage of lubricating oil from the bearing or the like is prevented. This is easy to prevent and has the effect of extending the life of the bearing even when used in a vertical electric motor or the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a resin member according to an embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional bearing device.

FIG. 7 is a cross-sectional view showing another conventional bearing device. 20 shaft 21 bearing 22 upper plate 23 middle plate 24 bracket 26 resin member 27 resin member 28 convex portion 29 lower plate 30 concave portion 31 resin member 32 convex portion 33 color 34 color 35 overhang portion 37 resin member 38 bracket 39 notch portion 40 felt 41 resin member 42 bracket 43 convex portion 45 color

Claims (7)

[Claims] 1. A bearing comprising a porous oil-impregnated material for holding a rotating shaft, and a holding member for holding the bearing in a predetermined position, the bearing being brought into contact with the bearing to recover the lubricating oil. A bearing device characterized in that a resin member containing a porous lubricating oil, which is reduced to, is attached to the holding member. 2. A bearing made of a porous oil-impregnated material for holding a rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. And a second member that axially contacts the first member and is located around the shaft, and the first and second members are each porous and contain lubricating oil. A bearing device comprising a resin. 3. The bearing device according to claim 2, wherein the contact surfaces of the first member and the second member are in contact with each other in an uneven shape. 4. The bearing device according to claim 2, wherein the first member and the second member are constituted by a single member. 5. A bearing made of a porous oil-impregnated material for holding a rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. Member, which is in contact with the first member in the axial direction, and is in contact with the oil-impregnating means that is located around the shaft and is capable of impregnating oil, and the surface on the shaft side of the oil-retaining device, and surrounds the shaft. And a second member, wherein each of the first and second members is made of a resin that is porous and contains lubricating oil. 6. The surface of the second member facing the shaft is arranged such that a portion farther from the bearing is closer to the shaft than a portion closer to the bearing. Either bearing device. 7. A bearing made of a porous oil-impregnated material for holding a rotating shaft, a holding member for holding the bearing at a predetermined position, and a first member which is in contact with the bearing and is located around the bearing. And a second member that axially contacts the first member and is located around the shaft, and the first and second members are each porous and contain lubricating oil. A second member is provided on both end surfaces of the first member in the axial direction of the first member so as to sandwich the first member, and the shafts at positions facing the respective second members are A bearing device characterized in that oil removing means for cutting off lubricating oil adhering to the shaft are provided around the shaft, respectively.