JP2578951Y2 - Double row rolling bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a double row rolling bearing, and more particularly to a lubricating structure thereof.

[0002]

2. Description of the Related Art Grease is generally used for lubrication in double row rolling bearings in which rolling elements of rolling bearings such as cylindrical roller bearings, tapered roller bearings, and self-aligning roller bearings are arranged in double rows.

[0003] However, grease requires maintenance for replenishment, and if leakage occurs, there is a problem that the periphery of the bearing is stained.

In order to solve such a problem, it can be considered that it is effective to use a solid lubricating composition instead of grease. In a double row rolling bearing filled with a solid lubricating composition, as shown in FIG. The composition 3 around the rolling elements 4 and 4 in each row is continuously and integrally solid.

[0005]

Generally, in a double-row rolling bearing, there is a difference in the revolution speed of the rolling elements in each row due to variations in processing dimensions and load conditions. For this reason, when a double-row rolling bearing is filled with a solid lubricating composition, the composition around the rolling elements in each row is integrated as described above, so that the difference in the revolution speed of the rolling elements in each row is reduced. If this occurs, there is a problem that the composition cracks and causes peeling and falling off.

Therefore, the present invention prevents the occurrence of cracks in the double row rolling bearing when a solid lubricating composition is used instead of the conventional grease due to the difference in the revolution speed of the rolling elements in each row. That is the task.

[0007]

In order to solve the above problems, the present invention provides a double row rolling bearing having a plurality of rolling elements interposed between an inner ring and an outer ring. Are filled with an independent solid lubricating composition for each row of rolling elements.

[0008]

In the double row rolling bearing having the above structure, since the solid lubricating composition is independent for each row of rolling elements, the solid lubricating compositions of each row are mutually reciprocated even if the revolution speed of the rolling elements is different. Not be affected by

[0009]

The embodiment shown in FIG. 1 is a double-row cylindrical roller bearing, in which the inner ends of two inner rings 1, 1 are abutted with each other, and the raceways 5, 5 of each of these inner rings 1, 1 are arranged on both sides. Two rows of cylindrical rollers 4, 4 are arranged between the two tracks 6, 6 of the common outer ring 2. Further, the inner diameter surfaces of the inner ends of the inner rings 1 and 1 are connected to each other by a connection fitting 7.

In the double row cylindrical roller bearing described above, the solid lubricant compositions 3, 3 independent of each row are filled around the cylindrical rollers 4, 4 of each row. This solid lubricating composition 3,3
At the outer periphery of the butted portion of the inner rings 1 and 1
They face each other in the gap 8.

The above solid lubricating composition is known under trade names such as "Plastic grease" and "Polyloop", and has an ultra-high molecular weight polyethylene 95 having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ^6. After filling a mixture of １1 wt% and 5-99 wt% of lubricating grease having a drop point higher than the gelling temperature of the ultra-high molecular weight polyethylene into the space around the rolling element 4, It is heated and fired at a temperature higher than the gelation temperature, and then cooled and solidified (see Japanese Patent Publication No. 23239/1988).

As another example of a plastic grease, lubricating grease having a drop point higher than the gel point of an ultrahigh molecular weight polyolefin having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ has a particle size of 1 to 100 μm. 95-1 wt% of the ultrahigh molecular weight polyolefin powder described above may be mixed and dispersed and maintained at a temperature equal to or higher than the gel point.

In any of the above cases, an additive for suppressing oozing of oil such as solid wax may be added.

FIG. 2 shows an apparatus for manufacturing a double row cylindrical roller bearing as described above. In the figure, 9 is an outer jig, 10 is an inner jig, 11 is a bolt connecting both jigs 9 and 10, and 12 is a dummy outer ring.

The outer jig 9 and the inner jig 10 oppose each other with the inner side 1 interposed therebetween. On the opposing inner surface of the outer jig 9, a ridge 13 is formed in an annular shape so as to closely fit in a gap between the outer end surface of the inner end 1 and the outer end surface of the outer end of the dummy outer ring 12. An air vent hole 14 is provided in a part of the ridge 13.

Also, on the opposing inner surface of the inner jig 10, a ridge 15 that fits tightly into a gap between the inner end portion outer diameter surface of the inner ring 1 and the inner end portion inner diameter surface of the dummy outer ring 12 is provided. Formed in a ring,
A material supply hole 16 is formed in a part of the ridge 15.

In the state shown in FIG. 2, the material of the solid lubricating composition 3 is supplied from the material supply hole 16. At this time, the internal air is discharged from the air vent hole 14. Thereafter, the air vent hole 14 and the material supply hole 16 are closed, and the material is fired and solidified, so that the solid lubricating composition 3 is filled in the void around the cylindrical roller 4.

The other inner ring 1 and the cylindrical rollers 4 arranged therearound are filled with the solid lubricating composition 3 in the same manner as described above. In this way, after two sets of combined bodies composed of the inner ring 1, the rolling elements 4 and the solid lubricating composition 3 are manufactured, they are inserted from both ends of the outer ring 2 (see FIG. 1), and the inner ends of the inner rings 1, 1 are respectively inserted. The two inner rings 1 and 1 are joined together by butting each other, fitting the connecting fitting 7. Thus, a double row cylindrical roller bearing as shown in FIG. 1 is completed.

Next, the second embodiment shown in FIG. 3 is a case of a double-row tapered roller bearing. Also in this case, the solid lubricating compositions 3 in each row face each other with a gap 8 therebetween. And are independent of each other. This case is the same as the above-described first embodiment except that the spacer 17 is interposed between the inner rings 1 and 1 and the tapered roller 4 ′ is held by the retainer 18.

FIG. 4 shows an apparatus for manufacturing a tapered roller bearing according to the second embodiment. In the figure, 9 is an outer jig, 10 is an inner jig, 11 is a connecting bolt, 12 is a dummy outer ring, and 19 and 20 are seal rubbers. Also, 21
Is a holding rubber that also serves as a seal.
1 pushes up the retainer 18 to the large diameter side of the tapered roller 4 ′, and prevents a gap from being formed between the tapered roller 4 ′ and the large diameter collar 22 of the inner ring 1.

The material of the solid lubricating composition 3 is supplied from the material supply hole 16 as in the first embodiment, and the internal air is exhausted from the air vent hole 14 at this time. Thereafter, the material is fired and solidified.

In the same manner, another set of the combined bodies is manufactured and assembled as shown in FIG.

[0023]

As described above, in the present invention, since the solid lubricating composition is independent for each row of rolling elements, even if a revolution difference occurs for each row of rolling elements, the solid lubricating composition is applied to each row. Revolves independently of each other and does not crack.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a cross-sectional view of the same manufacturing apparatus.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a cross-sectional view of the manufacturing apparatus of the above.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Solid lubricating composition 4 Cylindrical roller 4 'Tapered roller 5 Track 6 Track 7 Connecting bracket 8 Gap 9 Outer jig 10 Inner ring jig 11 Bolt 12 Dummy outer ring 13 Ridge 14 Air vent hole 15 Ridge 16 Material Supply hole 17 Spacer 18 Cage 19, 20 Seal rubber 21 Pressing rubber

Claims (1)

(57) [Scope of request for utility model registration] 1. A double row rolling bearing having a plurality of rows of rolling elements interposed between an inner ring and an outer ring, wherein a solid lubricating composition is provided for each row of rolling elements in a gap between the inner ring and the outer ring. Double row rolling bearing characterized by being filled with.