JP2000329146A - Cylindrical roller bearing using solid lubricant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical roller bearing with an excellent sealing property capable of lengthening a lubrication life and a bearing life. SOLUTION: Solid lubricants 4b, 4a are filled in a space formed between respective rollers 3, 3 and an annular space between outer and inner rings 1, 2 formed at an edge side of the roller 3 in a total roller type cylindrical roller bearing. The solid lubricant 4a at the roller edge side is adhered to an inner ring flange 1b formed on a flange ring 5 or the inner ring 1 and is opposed to an outer ring side flange 2b at a sealing surface of a slide contact or a space, i.e., a labyrinth seal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical roller bearing using a solid lubricant, which is suitable for use in parts requiring low-speed rotation and sealability, for example, for chain conveyors or wheels of steel facilities.

[0002]

2. Description of the Related Art Conventionally, a full-roller type, that is, a cylindrical roller bearing having no retainer as shown in FIG. The cylindrical roller bearing shown in the figure has a cylindrical roller 53 interposed between an inner ring 51 without a flange and an outer ring 52 with a flange, and a collar ring 54 is attached to the inner ring 51. The outer diameter portion of the collar ring 54 on the outer side in the axial direction is close to the inner diameter surface of the outer ring 52, and forms a labyrinth seal 55. Normal grease is sealed in the internal space of the bearing.

[0003]

This type of chain conveyor bearing is used in an environment where cooling water or the like of steel material falls, so that when cooling water or the like enters the inside of the bearing.
It may cause emulsification of grease and rust on bearings. For this reason, it is necessary to periodically grease up, maintenance is troublesome, and it is difficult to extend the life of the bearing, and it is necessary to replace the bearing early.

An object of the present invention is to provide a cylindrical roller bearing using a solid lubricant, which has excellent sealing properties and can prolong the lubrication life and the life of the bearing. Another object of the present invention is to provide a bearing excellent in productivity, which does not require time and effort for enclosing or separating a solid lubricant.

[0005]

SUMMARY OF THE INVENTION A cylindrical roller bearing using a solid lubricant according to the present invention is a full-roller type cylindrical roller bearing having a plurality of rollers arranged in a circumferential direction between an inner ring and an outer ring. The solid lubricant is sealed in the space between the raceway surfaces of the inner and outer races formed between the circumferentially adjacent rollers and the annular space between the inner and outer races formed on the end face side of the rollers.
The solid lubricant on the roller end face side adheres to one of the inner ring-side flange and the outer ring-side flange and faces the other flange with a sliding contact sealing surface or a gap serving as a labyrinth seal. The solid lubricant is obtained by heat-treating a mixture of a resin material and grease or lubricating oil to be solidified. According to this configuration, the solid lubricant covers the gap between the inner and outer rings, and seals with the sealing surface or the labyrinth seal in sliding contact. Therefore, foreign matter, water, and the like are prevented from entering the inside of the bearing, and even when used in an environment where water or the like is falling, the lubrication life is prevented from being shortened due to deterioration of the lubricant due to foreign matter or water entering. The solid lubricant lubricates rolling and sliding surfaces inside the bearing. For these reasons, a bearing having excellent sealing properties and excellent lubrication life and bearing life is obtained.

In the present invention, a non-contact seal member for sealing a gap between the inner and outer rings is provided on the outer race in an axial direction outside of the solid lubricant on the roller end surface side, and the solid lubricant on the roller end surface side is provided. May be attached to the inner ring side flange. In the case of this configuration, a double sealing structure of a sealing member and a sealing surface of a solid lubricant or a labyrinth seal is provided. The non-contact seal member has a labyrinth seal on the inner diameter side and a contact seal or labyrinth seal on the outer diameter side of the solid lubricant. Therefore, the infiltration path of the foreign matter and water is meandering, and the sealing effect is further enhanced in combination with the double sealing structure.

In the present invention, of the outer diameter surface of the inner ring-side flange and the inner diameter surface of the outer ring-side flange, the surface on which the solid lubricant is adhered is more rounded or rougher than the other surface. May be poor. The solid lubricant is solidified by, for example, enclosing the solid lubricant in a bearing in a fluid state and then firing the solid lubricant. When adopting such a solid lubricant encapsulation method, by keeping the surface in which the solid lubricant is in an inaccurate state as described above with low accuracy, after filling and firing, rotating the bearing, The portion filled with the solid lubricant on the roller end face side is unlikely to slip on the face whose accuracy has been deteriorated, and rotates together with the bearing ring having this face. Therefore, the portion of the solid lubricant on the roller end face side and the portion between the rollers are sheared with each other. For this reason, it is not necessary to perform separation work after enclosing the solid lubricant in a lump, or to incorporate the roller end face side portion of the solid lubricant and the portion between the rollers as separate bodies in advance. Enclosure work is easy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This cylindrical roller bearing using solid lubricant is a full-roller type in which a plurality of cylindrical rollers 3 are interposed between an inner ring 1 and an outer ring 2 in a circumferential direction, that is, a cylindrical roller bearing in which a cage is omitted. It is filled with a lubricant 4.

The outer diameter surface of the inner ring 1 is formed as a stepped cylindrical surface whose central portion in the axial direction serving as the raceway surface 1a has a larger diameter than the end portions 1b on both sides with a step. The width of the inner ring 1 is wider than that of the outer ring 2. A collar ring 5 serving as an inner ring-side flange is fitted to the end portion 1b of the inner ring 1 in contact with a step surface between the raceway surfaces 1a. The outer diameter surface of the collar ring 5 has a stepped cylindrical surface shape in which the end portion 5b has a smaller diameter than the central portion 5a. The outer ring 2 is provided on both axial sides of the inner diameter surface,
It has both flanges with a flange 2b. Flange 2b of outer ring 2
A seal mounting groove is formed on the inner diameter surface near the outer end,
The seal member 6 is attached in a fitted state. The seal member 6 is a non-contact seal whose inner diameter surface is close to the end portion 5b on the outer diameter surface of the collar ring 5, is formed of a metal plate, and also serves as a shield plate. Note that the collar 5 is a solid lubricant 4
In the case where a method of enclosing the entire inside of the bearing at once as described below is adopted as the encapsulation method, the outer surface of the collar ring (in this example, the central portion 5) is used to shear the solid lubricant 4 described later.
a) is set to be as poor as possible with respect to accuracy such as roundness and surface roughness as compared with the inner diameter surface of the outer ring flange 2b. Both the roundness and the surface roughness may be worse, or only one of them may be worse.

The solid lubricant 4 is applied to the raceway surfaces 1a, 2a of the inner and outer races 1, 2 formed between the rollers 3, 3 adjacent in the circumferential direction.
The space between the outer ring and the annular space between the inner and outer rings formed on the end face side of the roller 3, that is, between the outer diameter surface of the collar ring 5 and the outer ring flange 2b. The solid lubricant 4a on the roller end face side adheres to the outer diameter surface of the collar ring 5 serving as the inner ring side flange, and faces the outer ring side flange 2b with a sliding contact sealing surface or a gap serving as a labyrinth seal. Solid lubricant 4 on roller end face side
The axial width a is within the width of the central portion 5 a of the collar ring 5. The solid lubricant 4a on the roller end face side and the rollers 3, 3
In use, the solid lubricant 4b is separated from the solid lubricant 4b, for example, in sliding contact.

The solid lubricant 4 is obtained by heat-treating a mixture of a resin material and grease or lubricating oil, and for example, the following various lubricating compositions can be used. A lubricating composition obtained by heat-treating a liquid or semi-solid mixture obtained by mixing a high-molecular-weight polyethylene and a lubricating oil such as a mineral oil. A lubricating composition comprising a mixture of ultra-high molecular weight polyethylene and a lubricating grease having a drop point higher than the melting temperature of the polyethylene, which is heated to the melting temperature and solidified. 5-99 wt% of lubricating grease having a drop point higher than the gel point of an ultra-high molecular weight polyolefin having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ , and 95 to 1 wt% of the ultra-high molecular weight polyolefin powder having a particle size of 1 to 100 μm %, And dispersed and maintained at a temperature equal to or higher than the gel point. 5-99 wt% of lubricating grease having a drop point higher than the gel point of an ultra-high molecular weight polyolefin having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ , and 95 to 1 wt% of the ultra-high molecular weight polyolefin powder having a particle size of 1 to 100 μm % And an additive for suppressing oil bleeding from 1 to 50 wt%, and dispersed and maintained at a temperature equal to or higher than the gel point. Note that the average molecular weight and the proportion of each composition in the above are preferred examples, and need not necessarily be the above average molecular weight and the proportion.

An example of a method for enclosing the solid lubricant 4 will be described. When sealing the raw material of the solid lubricant 4 before solidification into the bearing, the injection jigs 10 and 11 are used to cover the bearing space to be sealed from both axial sides as shown in FIG. . The injection jigs 10 and 11 enclose the annular space between the inner and outer rings 1 and 2, specifically, the annular space between the outer diameter surface of the collar ring 5 and the inner diameter surface of the outer ring flange 2 b, with the solid lubricant 4 filled therein. One jig 10 has an injection hole 10a, and the other jig 11 has a confirmation hole 1
1a. As shown in the drawing, the two jigs 10 and 11 cover the jig 10, and a liquid or fluid material serving as the solid lubricant 4 is injected into the inner space of the bearing from the injection hole 10a of one of the jigs 10. When the solid lubricant material comes out of the confirmation hole 11a of the other jig 11, it is confirmed that the space inside the bearing is completely filled, and the injection is stopped. After the solid lubricant material is sealed in this way, the solid lubricant material is heated together with the bearings and the jigs 10 and 11, that is, fired and solidified.

The solid lubricant 4 thus solidified contracts upon cooling and makes light contact with the inner diameter surface of the outer ring flange 2b.
Alternatively, when a minute gap is formed as a labyrinth seal and the bearing is rotated, the solid lubricant 4a is separated into a ring-shaped solid lubricant 4a on the roller end side and a solid lubricant 4b between the adjacent rollers 3 and 3. In FIG. 2, a portion indicated by oblique lines indicates the separation surface. That is, the solid lubricant 4 contracts by being cooled after being solidified. Due to this contraction, the surface pressure of the solid lubricant 4 is increased with respect to the collar ring 5, and the surface pressure is reduced or a slight gap is generated with respect to the inner diameter surface of the outer ring collar 2b. As described above, in addition to the fact that the surface pressure of the solid lubricant 4 with respect to the collar ring 5 is high, the roundness and surface roughness of the outer diameter surface of the collar ring 5 are deteriorated. Solid lubricant 4
The sliding resistance against the collar ring 5 increases. Therefore, when the bearing is rotated, the portion 4 on the roller end face side of the solid lubricant 4 is formed.
a rotates together with the collar ring 5 or the inner ring 1, whereby the annular solid lubricant 4a on the roller end face side and the solid lubricant 4b between the adjacent rollers 3, 3 are sheared.

The method of enclosing the solid lubricant 4 is not limited to the above-mentioned method.
After the sealing and baking of b, the solid lubricant 4a on the roller end face may be sealed and fired in a later step, and the solid lubricant 4a on the roller end face may be formed into an annular shape outside the bearing. The inner ring 1 and the outer ring of the collar ring 5 may be attached by press fitting.

FIG. 4 shows an example of a chain conveyor equipped with the cylindrical roller bearing 20 using solid lubricant. In this chain conveyor, adjacent links 21 are connected via shafts 22 and bearings 20 for each link 21 connected in tandem. Each link 21 has opposing pieces 21a, 21a on both sides on one end side in the connection direction,
On the other end side, there are opposed pieces 21b, 21b located inside the opposed pieces 21a, 21a. Both ends of the shaft 22 are fixed to outer facing pieces 21a, 21a, and the inner ring 1 of the bearing 20 is rotatably fitted to the outer periphery of the shaft 22 by sliding contact. The end portion 1b of the inner ring 1 is
It is fitted inside the hole 1b. The outer ring 2 of the bearing 20 is used as a roller. This chain conveyor is used, for example, for conveying steel materials in steel facilities, and is used in an environment where cooling water is applied.

In the cylindrical roller bearing 20 of this configuration, since the solid lubricant 4 is sealed in the bearing in this manner, the solid lubricant 4 can have a sealing effect by sliding contact or a labyrinth sealing effect. Cooling water or the like that is likely to enter the bearing can be made harder than before.
As a result, the lubrication life and the life of the bearing can be extended. In this embodiment, since the seal 6 is attached to the outer ring 2, the labyrinth seal portion composed of the seal 6 and the collar ring 5 and the seal portion between the solid lubricant 4 and the outer ring side flange 2 b are doubled. A sealing effect is obtained, and the intrusion of cooling water and foreign matters is further reduced. In addition, the solid lubricant 4 lubricates the rolling and sliding surfaces inside the bearing, but some of the solid lubricants 4 may seep out oil little by little. Thus, a longer lubrication life can be obtained.

[0017]

The cylindrical roller bearing using a solid lubricant according to the present invention has a space between the raceways of the inner and outer rings formed between the circumferentially adjacent rollers and an inner and outer ring formed on the end face side of the rollers. A solid lubricant is sealed in the annular space between the rollers, and the solid lubricant on the roller end face side adheres to one of the inner ring side flange and the outer ring side flange and is in sliding contact with the other flange. Since they face each other with a gap serving as a labyrinth seal, intrusion of foreign matter, water, and the like is prevented by the solid lubricant, and excellent sealing properties are obtained, and a lubrication life and a life extension of the bearing life can be obtained. On the outer ring, a non-contact seal member that seals a gap between the inner and outer rings is provided outside the solid lubricant on the roller end face side in the axial direction, and the solid lubricant on the roller end face side is adhered to the inner ring side flange. In this case, a double seal consisting of a seal member and a seal made of a solid lubricant is provided, and the path of entry of foreign matter and water is meandering, thus providing a bearing with even better sealing properties. Of the outer diameter surface of the inner ring-side flange and the inner diameter surface of the outer ring-side flange, the surface in which the solid lubricant is adhered was determined to have poorer precision such as roundness or surface roughness than the other surface. In this case, when a fluid material is filled in a bearing and a solid lubricant is obtained by firing, there is no need to separate a portion of the solid lubricant on the roller end face side and a portion between the rollers, thereby reducing production. Good nature.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a cylindrical roller bearing using a solid lubricant according to one embodiment of the present invention.

FIG. 2 is a partially enlarged cutaway front view of the bearing.

FIG. 3 is an explanatory view of a solid lubricant enclosing operation of the bearing.

FIGS. 4A and 4B are a partially broken plan view and a partial front view, respectively, of a chain conveyor equipped with the bearing.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 2b ... Outer ring side flange 3 ... Roller 4 ... Solid lubricant 4a ... Solid lubricant on the roller end face side 4b ... Solid lubricant between each roller 5 ... Flange ring (inner ring side flange) 6 ... Seal member 10, 11 ... injection jig

Claims (3)

[Claims] 1. A full-roller type cylindrical roller bearing having a plurality of rollers arranged in a circumferential direction between an inner ring and an outer ring, wherein the inner and outer rings formed between the rollers adjacent in the circumferential direction are provided. Solid lubricant is sealed in the space between the raceway surfaces and the annular space between the inner and outer rings formed on the end face side of the roller, and the solid lubricant on the roller end face side is applied to one of the inner ring side flange and the outer ring side flange. A cylindrical roller bearing using solid lubricant, which is adhered and faces the other flange with a gap that forms a sliding contact seal surface or a labyrinth seal. 2. A non-contact seal member, which seals a gap between an inner ring and an outer ring, is provided on the outer ring in the axial direction outside of the solid lubricant on the roller end face side, and the solid lubricant on the roller end face side comprises: The cylindrical roller bearing using a solid lubricant according to claim 1 attached to the inner ring side flange. 3. An outer diameter surface of the inner ring-side flange and an inner diameter surface of the outer ring-side flange, in which the surface to which the solid lubricant is attached is more accurate than the other surface in terms of roundness or surface roughness. 3. The cylindrical roller bearing using a solid lubricant according to claim 1 or 2, wherein the cylindrical roller bearing has a poor performance.