JPH0650330A - Double row roller bearing and its manufacture - Google Patents

Abstract

PURPOSE:To provide a double row roller bearing filled with so-called plastic grease and having rollers held in the normal position. CONSTITUTION:Double row tracks 6 on the inner ring 1 are inclined inward and a guide roller 8 is provided between the respective tracks 6 in a double row roller bearing. The inner end faces of the respective rollers 3 are brought into contact with both side surface of the guide collar 8 and a space existing between the inner and outer rings 1, 2 inside the outer end faces of rollers 3 in the respective rows and gaps between respective drop-out preventing collars 7 in the inner ring and the outer end faces of rollers 3 are respectively filled with plastic grease 5.

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 manufacturing method thereof.

[0002]

2. Description of the Related Art Here, the plastic grease means 95 to 1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and a dropping point higher than the gelation temperature of the ultrahigh molecular weight polyethylene. Lubricating grease 5-9
After filling the bearing cavity with a mixture consisting of 9 wt%,
It is obtained by heating and burning above the gelling temperature of the ultrahigh molecular weight polyethylene, and then cooling and solidifying.

As another example of the plastic grease, a lubricating grease having a dropping point higher than the gelation point of an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ ultra high molecular weight polyolefin has a particle size of 1 to 100 μm in 5 to 99 wt% of the lubricating grease. It is also possible to mix 95 to 1 wt% of the ultrahigh molecular weight polyolefin powder and disperse and hold it at a temperature equal to or higher than the gel point. In any of the above cases, an oil exudation suppressing additive such as a solid wax may be added.

When the double-row roller bearing is filled with the above-mentioned plastic grease, it is convenient to realize both sealing and lubrication.

3 and 4 show an example of a self-aligning roller bearing filled with the above 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, and 5 is a cage. It is a plastic grease filled in the bearing space.

The bearing of FIG. 3 is obtained by firing the plastic grease 5 in a standing state, and the bearing of FIG. 4 is obtained by firing the plastic grease 5 in a state of being laid sideways.

[0007]

The bearing shown in FIG. 3 is one in which the axis of the bearing is kept horizontal and the plastic grease 5 is filled therein. In this case, the outer end surface of each roller 3 of the double row comes into contact with the fall-off preventing collar 7 on the outer side of the double row raceway 6 of the inner ring 1, and the space between the inner end surface of each roller 3 and the central guide collar 8 of the inner ring 1. A gap is created in the gap, and the gap is filled with the plastic grease 5.

This is because the plastic grease 5 has fluidity when it is unfired, so that the roller 3 moves along the inclination of the raceway 6 and comes into contact with the outer fall-off preventing collar 7, and the unfired raw material of the plastic grease is used. But each time 3 and guide brim 8
The cause is that it enters into the space between the and and is baked and solidified as it is.

Further, the bearing shown in FIG. 4 is a case where the plastic grease 5 is filled while holding the posture in which the axis is vertical. In this case, the inner end surfaces of the rollers 3 in one row come into contact with the guide collars 8, but the inner end surfaces of the rollers 3 in the other row are separated from the guide collars 8 to form a gap, and the plastic grease 5 that has entered the gap. The unsintered raw material is solidified as it is.

As described above, when the roller 3 is separated from the guide collar 8 or the guide wheel that replaces it, the roller 3 is in a skewed state, which causes trouble 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 surface of each roller 3, and this portion 5a may fall off during rotation.

Similar to the self-aligning roller bearing, the above problems also apply to the double-row tapered roller bearing in which the raceways formed on both sides of the guide collar of the inner ring have inwardly inclined raceways.

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

[0014]

In order to achieve the above object, a double row roller bearing of the present invention has a guide collar between two rows of raceways and a fall prevention collar at the outer end of each raceway. A double row roller bearing comprising an inner ring, an outer ring having a raceway facing each of the above raceways, and two rows of rollers interposed between the races of the inner race and the outer race, wherein each raceway of the inner race is inclined inward. In, the inner end surface of each row of rollers is brought into contact with both side surfaces of the guide collar, and a space existing between the inner ring and the outer ring inside the roller outer end surface of each row and each fall prevention collar of the inner ring and The gap between the outer ends of the rollers in each row facing each other is filled with plastic grease.

The method for manufacturing the double row roller bearing described above is
Encapsulating the unfired raw material of the plastic grease in the bearing space by using two encapsulating firing templates that are fitted on both sides of the bearing and that have ribs on the inner surface that press the outer ends of the rollers in each row. 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, so that the inner end surfaces of the rollers in each row are on both sides of the guide collar of the inner ring. The unfired raw material of the plastic grease is fired in contact with the surface.

[0016]

FIG. 1 shows a spherical roller bearing according to an embodiment of the present invention. The same parts as those shown in FIGS. 3 and 4 are given the same reference numerals, and the description thereof will be omitted.

The structure different from that described above is firstly that the inner end surface of the roller 3 in each row is in contact with both side surfaces of the guide collar 8, and secondly, the plastic grease 5 is outside the roller 3 in each row. A space filled inside the end face between the inner ring 1 and the outer ring 2 is filled with a plastic grease on the outside of the outer end face of the rollers 3 in each row except for a portion facing the fall prevention collar 7 described below. 5 does not exist, and thirdly, there is a gap between each of the fall prevention collars 7 of the inner ring 1 and the outer end surface of the rollers 3 of each row, and each gap is filled with the plastic grease 5. Is.

The rollers 3 in each row have a fall prevention brim 7 and 3
The plastic grease 5 filled in the gap between the outer end surface of the inner wall and the outer end surface keeps the inner end surface in contact with the guide flange 8 at all times and maintains a normal posture.

Next, with reference to FIG. 2, a method for manufacturing the above-described double row roller bearing, particularly a method for filling the plastic grease 5, will be described.

In FIG. 2, an encapsulating firing template 11 designated by reference numeral 11 has a collar 12 fitted on the outer peripheral surface of the outer ring 2, and a rib 13 for pressing the outer end surface of the roller 3 on the inner surface thereof.
Is provided all around. The surface of the rib 13 is formed to have an inclination that matches the outer end surface of the inclined roller 3. When the rib 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 brim 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 the unbaked raw material of plastic is put into the inner space of the bearing, and then the other template plate 11 is attached to the other end surface. Fit. After that, firing is performed to solidify the unfired raw material. After cooling, both template 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 slip-prevention collars on both sides of the inner ring and the plastic grease filled in the gap between the outer end surfaces of the rollers of each row are used to prevent the row of 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 retained inside the bearing and the thin portion is not exposed to the outside, there is no risk of falling off.

According to the method for manufacturing a double row roller bearing described above, plastic grease is enclosed in the bearing cavity using the encapsulating firing template, and firing is performed, and the rollers are inwardly moved by the ribs of the template. Since it is pushed in, the plastic grease is fired and solidified regardless of the posture of the bearing while the rollers maintain the normal posture.

[Brief description of drawings]

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

FIG. 2 is a partially enlarged cross-sectional view of the same as above during manufacturing.

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

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

[Explanation of symbols]

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

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[Procedure amendment]

[Submission date] August 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

Claims (2)

[Claims] 1. An inner ring having guide ribs between two rows of raceways and a fall-preventing collar at an outer end of each raceway, an outer race having a raceway facing each of the raceways, and raceways of the inner race and the outer race. In a double-row roller bearing consisting of two rows of rollers interposed therebetween, in which each race of the inner ring is inwardly inclined, the inner end surfaces of the rollers of each row are brought into contact with both side surfaces of the guide collar to thereby Ultra-high-molecular-weight polyethylene or a space between the inner ring and the outer ring on the inner side of the roller outer end surface of the row and the gap between each fall-off preventing collar of the inner ring and the outer end surface of the roller of each row facing it, respectively. A double row roller bearing, which is filled with a solid lubricating composition (hereinafter referred to as a plastic grease) made of a mixture of ultra-high molecular weight polyolefin and lubricating grease. 2. A method of manufacturing a double-row roller bearing, wherein a bearing space is filled with plastic grease, wherein ribs are fitted on both sides of the bearing and have inner surfaces for pressing outer end surfaces of the rollers of each row. Using the two enclosed firing templates provided, the unsintered raw material of the plastic grease is enclosed in the bearing space, and then the templates are fitted on both sides of the bearing, and the ribs on the inner surface of the templates are used to A double row roller bearing, characterized in that the unfired raw material of the plastic is fired in a state where the outer end surfaces of the rollers of the row are pressed to bring the inner end surfaces of the rollers of each row into contact with both side surfaces of the guide collar of the inner ring. Manufacturing method.