JP3971863B2 - Bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing device in which it is difficult to perform regular replenishment work of oils and fats including grease, and relates to a bearing device that is incorporated in, for example, a main motor and rotatably supports an armature shaft of the main motor.
[0002]
[Prior art]
For example, as shown in FIG. 8, a main motor A mounted on a railway vehicle or the like incorporates a bearing 2 that rotatably supports the armature shaft 1. As shown in FIG. 9, the bearing 2 has end face members 5, 6 in which grease pockets 3, 4 storing grease (not shown) are recessed on both end faces, and the bearing 2 and the end face are disposed adjacent to each other. The members 5 and 6 constitute a rolling bearing device. In this rolling bearing device, the oil contained in the grease in the grease pockets 3 and 4 is supplied into the bearing 2 so that the bearing 2 is lubricated for a long time.
[0003]
As shown in FIG. 10, the bearing 2 described above is formed on the inner ring 7 that is externally fitted and fixed to the armature shaft 1, the outer ring 8 that is positioned and fixed to a housing (not shown), and the inner diameter surfaces of the inner and outer rings 7 and 8. A main part is composed of a rolling element 11 such as a cylindrical roller inserted between the rolling surfaces 9 and 10. Note that flanges 12 and 13 projecting radially inward from the rolling surface 10 are provided at both axial ends of the outer ring 8.
[0004]
On the other hand, the end surface members 5 and 6 are disposed adjacent to both end surfaces of the bearing 2, and grease pockets 3 and 4 are formed so as to communicate with the open end portion between the inner and outer rings 7 and 8 of the bearing 2. Lubrication is performed by the oil content of the grease stored in the grease pockets 3 and 4 flowing into the bearing 2 through the inner diameter surfaces of the flange portions 12 and 13 of the outer ring 8.
[0005]
[Problems to be solved by the invention]
By the way, as described above, the inner ring 7 of the bearing 2 rotates because it is fitted and fixed to the armature shaft 1, and the outer ring 8 is fixed to the housing or the like. The oil component of the grease supplied to the air flows into the bearing 2 through the flanges 12 and 13 at the lower part of the outer ring 8.
[0006]
However, the amount of oil in the grease to be supplied is very small, and the flanges 12 and 13 of the outer ring 8 serve as a barrier, so that it is difficult to sufficiently supply the oil because the oil remains at that portion. When it becomes difficult to perform good lubrication in this way, there has been a problem that the durability of the bearing 2 is greatly reduced and the life of the bearing 2 is shortened.
[0007]
Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to easily realize good lubrication by oil exudation from grease, to improve the durability of the bearing and to achieve a long service life. An object of the present invention is to provide a bearing device that can be made simple.
[0008]
[Means for Solving the Problems]
As a technical means for achieving the above-mentioned object, the present invention provides an inner ring rotating with respect to a fixedly arranged outer ring , on at least one end face of a bearing formed with an insulating coating that exhibits an electrolytic corrosion preventing function . An end face member having a recessed grease pocket is disposed adjacent to each other, and the inner diameter surface of the flange portion of the outer ring constituting the bearing is not more than flush with the inner peripheral surface of the grease pocket of the end face member , The inner diameter end surface of the insulating coating formed of resin on the outer surface of the outer ring is flush with the flange inner diameter surface of the outer ring . In addition, this invention is applicable not only when either end surface of a bearing but when the end surface member is arrange | positioned at the both end surfaces of a bearing.
[0009]
In this way, the flange inner diameter surface of the outer ring is equal to or less than the inner surface of the grease pocket of the end face member, and the inner diameter end surface of the insulating coating formed of resin on the outer surface of the outer ring is the surface of the outer ring flange inner surface. As a result, the flange portion of the outer ring does not become a barrier from the grease pocket of the end face member to the inside of the bearing, and a step is formed between the inner diameter surface of the outer ring flange portion and the grease pocket inner peripheral surface of the end face member. Since it can be eliminated, it becomes easy to sufficiently supply the grease oil from the grease pocket to the inside of the bearing.
[0010]
Further, the present invention is a taper that expands the inner ring surface of the outer ring toward the raceway surface, or a taper that expands the inner peripheral surface of the grease pocket of the end surface member toward the inner ring surface of the outer ring. In this case, the oil content of the grease flows down from the grease pocket toward the inside of the bearing, which is desirable in that the supplied oil content of the grease can smoothly flow into the raceway surface. The tapered portion may be one or both of the flange inner diameter surface of the outer ring and the grease pocket inner peripheral surface of the end surface member.
[0012]
The bearing described above can be applied to a main motor for a railway vehicle or the like and rotatably supporting the armature shaft.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the bearing device according to the present invention will be described in detail below. The bearing device of the present invention is incorporated in, for example, a main motor (see FIG. 8) mounted on a railcar or the like and rotatably supports its armature shaft. Of course, the invention can be applied to other than the above.
[0014]
In the rolling bearing device of the embodiment shown in FIG. 1, grease pockets 22 and 23 storing grease are recessed in both end faces of a bearing 21 that rotatably supports an armature shaft 1 of a main motor mounted on a railway vehicle. The end face members 24 and 25 are arranged adjacent to each other, and the oil contained in the grease in the grease pockets 22 and 23 is supplied into the bearing 21 so that the bearing 21 is lubricated for a long period of time.
[0015]
The bearing 21 includes an inner ring 26 fitted and fixed to the armature shaft 1, an outer ring 27 positioned and fixed to a housing (not shown), and rolling surfaces 28 formed on the inner diameter surfaces of the inner and outer rings 26 and 27. A main part is constituted by a rolling element 30 such as a cylindrical roller inserted between 29. Note that flanges 31 and 32 projecting radially inward from the rolling surface 29 are provided at both ends of the outer ring 27 in the axial direction.
[0016]
On the other hand, the end face members 24 and 25 are disposed adjacent to both end faces of the bearing 21, and grease pockets 22 and 23 are formed so as to communicate with the open end portions between the inner and outer rings 26 and 27 of the bearing 21. Lubrication is performed by the oil component of the grease stored in the grease pockets 22 and 23 flowing into the bearing 21 through the flange portions 31 and 32 of the outer ring 27.
[0017]
In the embodiment shown in FIG. 1, the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27 and the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 of the end surface members 24 and 25 are flush with each other. The inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27 may be equal to or less than the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 of the end surface members 24 and 25. For example, FIG. As shown in the embodiment, the inner diameter surfaces 33 ′ and 34 ′ of the flange portions 31 and 32 of the outer ring 27 are radially outward with respect to the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 of the end surface members 24 and 25. You may make it locate in this.
[0018]
In this way, the inner diameter surfaces 33 (33 ′) and 34 (34 ′) of the flange portions 31 and 32 of the outer ring 27 are not more than flush with the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 of the end surface members 24 and 25. As a result, the flanges 31 and 32 of the outer ring 27 do not become barriers from the grease pockets 22 and 23 of the end face members 24 and 25 to the inside of the bearing 21, so that the grease is transferred from the grease pockets 22 and 23 to the inside of the bearing 21. It becomes easy to supply a sufficient amount of oil.
[0019]
If the inner diameter surfaces 33 ″ and 34 ″ of the flange portions 31 and 32 of the outer ring 27 are tapered toward the raceway surface 29 as in the other embodiment shown in FIG. Since the oil flows down from the grease pockets 22 and 23 toward the inside of the bearing 21, the oil component of the supplied grease can smoothly flow into the raceway surface 29 of the outer ring 27. Further, as in the embodiment shown in FIG. 4, the inner peripheral surfaces 35 ′ and 36 ′ of the grease pockets 22 and 23 of the end surface members 24 and 25 are expanded toward the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27. It is also possible to have a tapered shape with a diameter. Although not shown, both the inner diameter surfaces of the flanges 31 and 32 of the outer ring 27 and the inner peripheral surfaces of the grease pockets 22 and 23 of the end surface members 24 and 25 can be tapered.
[0020]
On the other hand, in the bearing 21 incorporated in the main motor of a railway vehicle or the like, in order to prevent a phenomenon in which leakage current from the housing or the armature shaft 1 flows between the rolling elements 30 and the inner and outer rings 26 and 27 and thus electrolytic corrosion occurs. As shown in FIG. 5, an electrically insulating film 37 (insulating film) is formed on the outer diameter surface and the end surface, which are the outer surfaces of the outer ring 27, so as to cut off current from the outside.
[0021]
However, in this type of bearing 21 having an electrolytic corrosion preventing function, a step is formed between the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27 and the inner diameter end surfaces 38 and 39 of the insulating coating 37, and A concave groove may be formed between the flange portions 31 and 32 and the grease pockets 22 and 23 of the end surface members 24 and 25. If it does so, the oil component of grease will accumulate in a ditch | groove, and it may become difficult to supply the oil component of grease to the inside of the bearing 21 from the grease pockets 22 and 23.
[0022]
Therefore, in the bearing 21 of the embodiment shown in FIG. 6, the inner diameter end surfaces 41 and 42 of the insulating coating 40 formed on the outer surface of the outer ring 27 are flush with the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27. To do. In this way, even when an insulating coating is formed in order to exhibit the electrolytic corrosion prevention function, there is a step between the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27 and the inner diameter end surfaces 41 and 42 of the insulating coating 40. Can be continued from the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 to the inner diameter surfaces 33 and 34 of the flanges 31 and 32 of the outer ring 27, and the grease is transferred from the grease pockets 22 and 23 to the inside of the bearing 21. It becomes easy to supply a sufficient amount of oil.
[0023]
In addition, the above-mentioned insulating coatings 37 and 40 can improve the creep resistance by being formed of a material mainly composed of PPS (polyphenylene sulfide) resin containing glass fibers and alumina ceramics. High thermal conductivity can be obtained.
[0024]
In the above-described embodiment, the end portions 41 and 42 of the insulating coating 40 made of PPS resin are extended to the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27 so that the step is eliminated. Even in the case where the insulating coating 37 (see FIG. 5) is formed on the outer surface of the outer ring 27 as in the other embodiment shown, the groove formed between the flange portions 31 and 32 and the end surface members 24 and 25 By embedding insulating coatings 43 and 44 made of another resin having the same insulating property as the PPS resin of the insulating coating 37, for example, polyethylene resin, the inner diameter end surfaces 45 and 46 of the insulating coatings 43 and 44 are made the outer ring 27. The flanges 31 and 32 can be flush with the inner diameter surfaces 33 and 34, and the above-described steps can be eliminated.
[0025]
Also in this case, the grease can be continued from the inner peripheral surfaces 35 and 36 of the grease pockets 22 and 23 to the inner diameter surfaces 33 and 34 of the flange portions 31 and 32 of the outer ring 27, and the grease is transferred from the grease pockets 22 and 23 to the inside of the bearing 21. It becomes easy to supply a sufficient amount of oil.
[0026]
【The invention's effect】
According to the present invention, the inner diameter surface of the outer ring is made equal to or less than the inner peripheral surface of the grease pocket of the end face member, and the inner diameter end surface of the insulating coating formed of resin on the outer surface of the outer ring is used as the inner diameter of the outer ring By making it flush with the surface , the flange part of the outer ring does not become a barrier from the grease pocket of the end face member to the inside of the bearing, and between the inner diameter face of the outer ring flange part and the grease pocket inner peripheral surface of the end face member in it is possible to eliminate the difference in level, it is easy to sufficiently supply oil of the grease from the grease pocket into the bearing.
[0027]
If the inner ring surface of the outer ring has a tapered shape that expands toward the raceway surface, or the inner surface of the grease pocket of the end surface member has a tapered shape that expands toward the inner surface of the outer ring. Since the oil component of the grease flows down from the grease pocket toward the inside of the bearing, the supplied oil component of the grease can smoothly flow into the raceway surface of the outer ring.
[0029]
As described above, according to the present invention, good lubrication with grease can be easily realized, so that the durability and long life of the bearing can be improved, and its practical value is great.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view showing a main part of a bearing device according to an embodiment of the present invention, in which a flange inner diameter surface of an outer ring and an inner peripheral surface of a grease pocket of an end surface member are flush with each other. FIG. 3 is an enlarged cross-sectional view of a main part showing a case where the inner diameter surface of the flange portion of the outer ring is positioned radially outward with respect to the inner peripheral surface of the grease pocket of the end face member in the bearing device of another embodiment. FIG. 4 is an enlarged cross-sectional view of a main part showing a case where the inner diameter surface of the flange portion of the outer ring is tapered in the bearing device of another embodiment. FIG. 4 is a view of the inside of the grease pocket of the end face member in the bearing device of another embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of a main part showing a bearing device for explaining problems in the case where an insulating film for preventing electrolytic corrosion is formed on the surface of the outer ring. FIG. 6 shows an electrolytic corrosion preventing bearing device according to another embodiment of the present invention. FIG. 7 is an electrolytic corrosion prevention bearing device according to another embodiment of the present invention in which the surface and the inner diameter end surface of the insulating coating are flush with each other. Fig. 8 is an enlarged cross-sectional view of the main part showing a case where the inner peripheral surface of the grease pocket is continuous with another insulating coating. Fig. 8 is a cross-sectional view including a part of the main motor mounted on a railcar. FIG. 10 is a cross-sectional view including a partially omitted portion showing a bearing device incorporated in a vehicle main motor. FIG. 10 is an enlarged cross-sectional view of the main part of FIG.
21 Bearings 22 and 23 Grease pockets 24 and 25 End face member 26 Inner ring 27 Outer rings 28 and 29 Raceway surfaces 31 and 32 Inner surface 33 and 34 Inner surface 35 and 36 Inner surface 37 and 40 Insulating coating 41 and 42 Inner end surface 43 and 44 Insulation coating 45, 46 Inner diameter end face

Claims (5)

The inner ring rotates with respect to the fixedly arranged outer ring, and an end face member with a recessed grease pocket is placed adjacent to at least one end face of the bearing formed with an insulating coating that exhibits the function of preventing electric corrosion. And the inner diameter surface of the flange portion of the outer ring constituting the bearing is equal to or less than the inner peripheral surface of the grease pocket of the end surface member, and the inner diameter end surface of the insulating coating formed of resin on the outer surface of the outer ring is provided. A bearing device characterized by being flush with a flange inner diameter surface of an outer ring .   2. The bearing device according to claim 1, wherein the outer ring has a tapered shape in which the inner diameter surface of the flange portion expands toward the raceway surface.   The bearing device according to claim 1, wherein the inner peripheral surface of the grease pocket of the end surface member is tapered to expand toward the inner diameter surface of the flange portion of the outer ring.   The inner ring surface of the outer ring has a tapered shape that expands toward the raceway surface, and the inner peripheral surface of the grease pocket of the end surface member has a tapered shape that expands toward the inner surface of the outer ring of the flange. The bearing device according to claim 1, wherein The bearing apparatus according to claim 1, 2, 3 or 4, wherein the bearing with the outer ring is integrated into the main motor.

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