JPH0645117U - Rolling bearing lubrication structure - Google Patents

Abstract

(57) [Abstract] [Purpose] It is applied to axle bearings for railway vehicles, bearings for industrial machines and machine tools. Maintenance-free, enabling long-term operation. [Structure] The present invention is applied to a double row rolling bearing in which two rows of inner rings 2 and 2 are arranged side by side through an inner ring spacer 4. In this bearing, the inner ring spacer 4 is provided with an engaging portion 4a that engages with the outer circumferences of the inner rings 2 and 2 on both sides, and the inner ring spacer 4 has an inner diameter surface extending between the adjacent ends of the inner rings 2 and 2. A lubricant reservoir recess 11 is provided. A lubricant outflow passage 12 such as a fine hole that opens from the lubricant reservoir recess 11 to the space between the inner and outer races 2, 3 is provided. General lubricant, so-called plastic grease, or the like is filled in the lubricant reservoir recess 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubrication structure for axle bearings for railway vehicles and rolling bearings such as grease lubrication used in industrial machines, machine tools and the like.

[0002]

[Prior art]

 Conventionally, a grease-lubricated double-row tapered roller bearing shown in FIG. 2 has been used as an axle bearing for a rail vehicle. In this bearing, two rows of inner rings 21 and 21 are arranged side by side via an inner ring spacer 23, and one outer ring 22 is shared by both rows, and a cage is provided between the inner and outer rings 21 and 22. Rolling elements 25 of each row held by 24 are interposed. Inner ring retainers 26 are arranged on both sides of the two rows of inner races 21, and a seal mounting ring 27 provided on the outer race 22 is provided with a seal 28 in contact with the outer diameter surface of the inner race retainer 26. In this bearing, the grease G is filled in the inner diameter portion of the cage 24 and the outer diameter portion of the inner ring spacer 23, and for example, grease is filled in a range of about 40% of the total space volume between the inner and outer rings 21, 22. Has been done.

[0003]

[Problems to be solved by the device]

 With the rotation of the bearing, the grease G enclosed in the inner diameter portion of the cage 24 as described above gradually moves to the seal 28 side. The grease G that has moved to the seal 28 side is not used for lubrication and remains as it is because the force that returns it to the inside of the bearing does not act. As described above, even if a large amount of grease G is filled, most of it is difficult to use for lubrication, and it is difficult to improve the lubrication life. When greasing on the way, it is necessary to disassemble the bearing box, etc., and maintenance tends to be troublesome.

An object of the present invention is to provide a lubrication structure for a rolling bearing which is maintenance-free and can be operated for a long period of time.

[0005]

[Means for Solving the Problems]

 The lubrication structure of the present invention is applied to a double row rolling bearing in which two rows of inner rings are arranged side by side through inner ring spacers. In this bearing, the inner ring spacer is provided with an engaging portion that engages with the inner rings on both sides, and the inner surface of the inner ring is provided with a lubricant reservoir recessed portion extending between the adjacent end portions of both inner rings and the inner ring spacer. A lubricant outlet passage is provided which opens from the lubricant reservoir recess to the space between the inner and outer races.

[0006]

[Action]

 According to this structure, the lubricant or its components sealed in the lubricant reservoir recesses flow out from the lubricant outflow passage due to the centrifugal force or the like associated with the rotation of the bearing, and enter the space between the outer rings. At this time, by setting the cross section of the lubricant outflow channel to an appropriate size, the lubricant or its components will flow out in small amounts, so the bearing temperature will rise rapidly due to the stirring resistance of the lubricant, etc. In no case, good lubrication is achieved. In this way, the lubricant or its component is continuously supplied in a minute amount from the lubricant reservoir concave portion, so that the lubrication life is improved and it can be used without long-term maintenance. In addition, the lubricant is filled between the inner and outer rings as usual. In addition, since the engaging portions of the inner ring spacer engage with the inner rings on both sides, the radial position is maintained even if the inner diameter surface is entirely away from the shaft as a lubricant reservoir recess.

[0007]

【Example】

 An embodiment of this invention will be described with reference to FIG. This embodiment shows an example applied to a double row tapered roller bearing. In this double-row bearing, the inner rings 2 and 2 of the bearings 1 and 1 of each example are individually provided and the outer ring 3 is shared, and a ring-shaped inner ring spacer 4 is provided between both inner rings 2 and 2. The inner ring 2 has a collar 2a at the large diameter end, and the small diameter end sides are adjacent to each other. Rolling elements 6 held by a cage 5 are interposed in each row between the inner and outer races 2, 3. Inner ring retainers 7 are arranged on both sides of the inner ring 2 in two rows, and a seal mounting ring 8 provided on the outer ring 3 is provided with a seal 9 that contacts the outer diameter surface of the inner ring retainer 7. Reference numeral 10 denotes a nut for tightening the inner ring retainer 7.

The inner ring spacer 4 has a brim-shaped engaging portion 4 a that engages with the outer periphery of the ends of the inner rings 2 and 2 on both sides. The inner ring spacer 4 has an inner diameter of the inner ring spacer 4 and adjacent ends of the inner rings 2 and 2. The inner diameter is increased to form a circumferential groove-shaped lubricant reservoir recess 11 extending between the inner rings 2 and 2 and the inner ring spacer 4. The inner ring spacer 4 is provided with a lubricant outflow passage 12 composed of radial pores at a plurality of circumferential positions. Since the inner ring spacer 4 is thus formed with a large inner diameter, it separates from the shaft (not shown), but since it engages with the inner ring 2 by the flange-shaped engaging portion 4a, the radial position is maintained.

On the inner diameter surface on the large-diameter end side of both inner rings 2 and 2, end-side lubricant reservoir recesses 14 formed of circumferential grooves are provided, and lubricant formed of radial pores is provided at a plurality of circumferential positions. An outflow passage 15 is provided. The lubricant outflow passage 15 is open to the polishing recessed portion between the raceway surface and the flange portion 2a.

A lubricant A is filled in each of the lubricant reservoir recesses 11 and 15. As the lubricant A, in addition to general semi-solid or solid grease, liquid grease, plastic grease, oil-containing resin, woven cloth or felt containing a lubricant, porous material, etc. may be used. it can. Plastic grease is a composition in which a mixture of a resin such as ultra-high molecular weight polyethylene or ultra-high molecular weight polyolefin and grease is heated and melted and then solidified by cooling, and one in which oil gradually exudes has been developed. . In addition, grease or the like is filled between the inner and outer rings 2 and 3 as in the conventional case.

According to this configuration, the lubricant A or its components enclosed in the central lubricant reservoir recess 11 passes through the lubricant outflow passage 12 between the inner and outer races 2 and 3 due to centrifugal force or the like associated with rotation. Enter the space. When the lubricant A is solid grease, the grease base oil is mainly separated from the thickener and flows out. At this time, by setting the cross-sectional diameter of the lubricant outflow passage 12 to an appropriate size, the lubricant A or its components will come out in small amounts, so that the bearing temperature may rise sharply due to the stirring resistance of the lubricant A or the like. No good lubrication condition. As described above, since the lubricant A or its component is continuously supplied in a small amount from the lubricant reservoir concave portion 11, the lubrication life is improved, and it can be used without long-term maintenance. However, since the lubricant reservoir recess 11 is provided on the inner circumference of the inner ring spacer 4, it is possible to increase the capacity thereof, and from this also the effect of improving the lubricating life can be increased.

Further, with the rotation of the bearing, the lubricant A or its component in the end side lubricant reservoir recess 14 is also supplied from the lubricant outflow passage 15 to the inner and outer races 2 and 3 in small amounts. Therefore, the lubrication life can be further improved. Moreover, the supplied lubricant A or its components flowing out from the lubricant outflow passage 15 is supplied to the inner surface of the collar portion 2a of the inner ring 2, so that the lubrication of the collar portion 2a, which is a sliding surface that easily causes lubrication failure, is performed well. You can do it.

When the lubricant A sealed in the lubricant reservoir recesses 11 and 14 is a plastic grease, the grease itself has a characteristic of bleeding out oil little by little, so that the diameter of the lubricant outlet passage 12 is slightly large. Can supply a small amount for a long time. Also, for maintenance, it can be handled as a solid and workability is good.

It should be noted that the end side lubricant reservoir recess 14 is not necessarily provided. Further, the lubricant outflow passage 12 of the lubricant reservoir recess 11 is not limited to a fine hole, and for example, a minute gap generated by surface roughness on the contact surface between the inner ring spacer 4 and the inner ring 2 may be used as the lubricant outflow passage. Further, it may be a groove having a minute depth formed on the contact surface. Further, the present invention is not limited to the bearing of the type in which one outer ring 3 is shared by two rows as in the above embodiment, but can be applied to a double row rolling bearing in which two independent bearings are combined. You can

[0015]

[Effect of device]

 The lubrication structure of the rolling bearing according to the present invention is provided with a lubricant reservoir recessed portion on the inner diameter surface extending from the inner ring spacer arranged between the inner rings of both rows in the double-row bearing and the adjacent end portions of both inner rings, and from the recessed portion to the inner and outer portions. Since the lubricant outflow passage that opens into the space between the wheels is provided, the lubricant or its components enclosed in the lubricant reservoir recesses are supplied in small amounts between the inner and outer rings during operation. Therefore, the lubrication life is improved and long-term maintenance-free can be achieved.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

2 ... inner ring, 3 ... outer ring, 4 ... inner ring spacer, 5 ... cage, 6 ...
Rolling element, 9 ... Seal, 11 ... Lubricant reservoir recess, 12 ... Lubricant outflow passage

Claims (1)

[Scope of utility model registration request] 1. A double-row rolling bearing in which two rows of inner rings are arranged side by side with an inner ring spacer provided between the inner ring spacers and engaging portions for engaging the inner rings on both sides. A lubrication structure for a rolling bearing, in which a lubricant reservoir recess is provided on the inner diameter surface between the end portion and the inner ring spacer, and a lubricant outflow passage is provided from the lubricant reservoir recess to the space between the inner and outer rings.