JP3170045B2 - Double row roller bearing and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-row roller bearing such as a self-aligning roller bearing and a double-row tapered roller bearing, and more particularly to a double-row roller bearing filled with so-called plastic grease and a method of manufacturing the same.

[0002]

2. Description of the Related Art Here, plastic grease refers to 95-1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and a drop point higher than the gelling temperature of the ultrahigh molecular weight polyethylene. Lubricating grease having 5-9
After filling the bearing space with a mixture consisting of 9 wt%,
The ultrahigh molecular weight polyethylene is heated and baked at a temperature equal to or higher than the gelation temperature, and then cooled and solidified.

[0003] Other examples of plastic grease, the lubricating grease 5～99Wt% with higher dropping point above the gelling point of the average molecular weight of about 1 × 10 ⁶ ~5 × 10 ⁶ ultra high molecular weight polyolefin having a particle size of 1~100μm 95 to 1 wt% of the ultrahigh molecular weight polyolefin powder may be mixed and dispersed and maintained at a temperature equal to or higher than the gel point. In any of the above cases, oil bleeding-suppressing additives such as solid wax may be added.

[0004] When the double-row roller bearing is filled with the plastic grease as described above, it is convenient to realize both sealing and lubrication.

FIGS. 3 and 4 show an example of a self-aligning roller bearing filled with the above-mentioned plastic grease. In the figures, 1 is an inner ring, 2 is an outer ring, 3 is a double row roller, 4 is a cage, 5 is a cage. Plastic grease filled in the bearing space.

The bearing shown in FIG. 3 is obtained by firing the plastic grease 5 in an upright state, and the bearing shown in FIG. 4 is obtained by firing the plastic grease 5 in a state where the bearing is placed sideways.

[0007]

The bearing shown in FIG. 3 is a case in which the plastic grease 5 is filled while keeping the axis horizontal. In this case, the outer end face of each roller 3 in the double row comes into contact with the fall prevention collar 7 outside the double row track 6 of the inner race 1, and the gap between the inner end face of each roller 3 and the guide flange 8 in the center of the inner race 1 is formed. Is formed, and the plastic grease 5 is filled in the gap.

This is because the plastic grease 5 has fluidity in the unfired state, so that the rollers 3 move along the inclination of the track 6 and come into contact with the outer falling prevention collar 7, and the unfired raw material of the plastic grease 5 But each roller 3 and guide brim 8
This is caused by being baked and solidified as it is.

FIG. 4 shows a case in which the bearing is filled with the plastic grease 5 while keeping its axis perpendicular. In this case, the inner end face of the roller 3 in one row contacts the guide collar 8, but the inner end face of the roller 3 in the other row is separated from the guide collar 8 to form a gap, and the plastic grease 5 that has entered the gap is formed. Is solidified as it is.

As described above, the state where the rollers 3 are separated from the guide flange 8 or the guide wheels instead of the guide flanges is a state in which the rollers 3 are skewed, which causes troubles such as seizure during operation.

Further, according to the conventional method, a thin portion 5a having a triangular cross section is formed in contact with the outer end face of each roller 3, and there is a risk that this portion 5a may fall off during rotation.

[0012] The above problems also apply to double row tapered roller bearings in which the tracks formed on both sides of the guide ring of the inner ring have inwardly inclined tracks, similarly to the self-aligning roller bearing.

Accordingly, an object of the present invention is to provide a double-row roller bearing such as a self-aligning roller bearing and a double-row tapered roller bearing which solve these problems, and a method of manufacturing the same.

[0014]

In order to achieve the above object, a double row roller bearing according to the present invention has a guide flange between two rows of tracks, and has a fall prevention collar at an outer end of each track. A double-row roller bearing comprising an inner ring, an outer ring having a track facing each of the above-mentioned tracks, and two rows of rollers interposed between the tracks of the inner and outer rings, wherein each track of the above-mentioned inner ring is inclined inward. In the above, the inner end faces of the rollers of each row are brought into contact with both side faces of the guide collar, and the inner space between the inner ring and the outer ring and the fall prevention collars of the inner ring and the inner ring are provided inside the outer end faces of the rollers of each row. The gap between the roller and the outer end face of each opposing row is filled with plastic grease.

[0015] Further, the method for manufacturing the double row roller bearing described above includes:
The unfired raw material of the plastic grease is sealed in the bearing space by using two sealing firing mold plates which are fitted on both sides of the bearing and provided on the inner surface with ribs for pressing the outer end surfaces of each row of rollers, respectively. After that, the template is fitted on both sides of the bearing, and the ribs on the inner surface of the template press the outer end surfaces of the rollers in each row, and the inner end faces of the rollers in each row are respectively placed on both sides of the guide ring of the inner race. The unfired raw material of the plastic grease is fired in a state of being in contact with the surface.

[0016]

FIG. 1 shows a self-aligning roller bearing according to an embodiment of the present invention. The same portions as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

The constructions different from those described above are firstly that the inner end faces of the rollers 3 in each row are in contact with both side faces of the guide collar 8, and secondly that the plastic grease 5 is provided outside the rollers 3 in each row. The inside of the end face is filled with a space existing between the inner ring 1 and the outer ring 2, and the outside of the outer end face of the rollers 3 in each row is made of plastic grease other than a portion opposed to a fall prevention collar 7 described below. Thirdly, there is a gap between each fall prevention collar 7 of the inner ring 1 and the outer end face of each row of rollers 3, and the gap is filled with the plastic grease 5. It is.

Rollers 3 in each row are provided at 7 places 3
The inner end face is always brought into contact with the guide flange 8 by the plastic grease 5 filled in the gap between the inner end face and the outer end face, and the normal posture is maintained.

Next, a method for manufacturing the above-described double row roller bearing, particularly a method for filling the plastic grease 5, will be described with reference to FIG.

In FIG. 2, an enclosing firing template 11 indicated by reference numeral 11 has a flange 12 fitted on the outer peripheral surface of the outer race 2 and a rib 13 for pressing the outer end surface of the roller 3 on its inner surface.
Is provided over the entire circumference. The surface of the rib 13 is formed so as to have an inclination that matches the outer end surface of the inclined roller 3. When the collar 12 is fitted to the outer ring 2, the rib 13 presses the outer end surface of the roller 3, 3 is brought into contact with the guide collar 8.

One of the template plates 11 as described above is fitted to one end surface of the inner ring 1 and the outer ring 2, and after the unfired plastic material is put in the internal space of the bearing, another template plate 11 is attached to the other end surface. Fit. Thereafter, firing is performed to solidify the unfired raw material. After the cooling, both mold plates 11 are removed to obtain the desired bearing.

The bearing thus obtained is the same as that shown in FIG.

[0023]

As described above, according to the double row roller bearing of the present invention, the plastic grease filled in the gap between the fall prevention collars on both sides of the inner ring and the outer end faces of the rollers in each row makes it possible to form each row. It is possible to maintain a normal posture in which the inner end surface of the roller is always in contact with the guide collar.

Further, since the plastic grease is held inside the bearing and the thin portion is not exposed to the outside, there is no fear of falling off.

Further, according to the method for manufacturing a double row roller bearing, plastic grease is sealed in the bearing space by using a sealing firing template, and then fired, and the rollers are inwardly moved by the ribs of the template. The plastic grease is fired and solidified in a state where the rollers maintain a normal posture regardless of the posture of the bearing.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of an embodiment.

FIG. 2 is a partially enlarged cross-sectional view during the same manufacturing process.

FIG. 3 is a partially enlarged sectional view of a conventional spherical roller bearing;

FIG. 4 is a partially enlarged cross-sectional view of another conventional spherical roller bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Roller 4 Cage 5 Plastic grease 6 Track 7 Fall-off prevention collar 8 Guide collar 11 Template plate 12 Collar 13 Rib

Claims (2)

(57) [Claims] 1. An inner race having a guide flange between two rows of raceways and having a fall-prevention collar at an outer end of each raceway, an outer race having a raceway facing each raceway, and raceways of these inner races and outer races In the double-row roller bearing, comprising two rows of rollers interposed between each other and each track of the inner ring being inclined inward, the inner end faces of the rollers in each row are brought into contact with both side faces of the guide flange, The gap existing between the inner ring and the outer ring inside the outer end face of the row rollers and the gap between each fall prevention collar of the inner ring and the outer end face of each row of rollers facing the same. A double row roller bearing filled with a solid lubricating composition (hereinafter, referred to as plastic grease) comprising a mixture of an ultrahigh molecular weight polyolefin and a lubricating grease. 2. A method of manufacturing a double-row roller bearing in which a bearing space is filled with plastic grease, wherein ribs are fitted on both surfaces of the bearing, and press on the inner surface thereof to press the outer end surfaces of the rollers in each row. After the unfired raw material of the plastic grease is sealed in the bearing space using the two enclosing and firing templates provided, the templates are fitted on both sides of the bearing, respectively, and the respective ribs on the inner surface of the template are used to fit each of them. A double row roller bearing wherein the unfired raw material of the plastic is fired in a state where the outer end faces of the row rollers are pressed so that the inner end faces of the rollers in each row are in contact with both side faces of the guide collar of the inner ring, respectively. Manufacturing method.