JP2002089568A - Thrust rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a thrust rolling bearing by using a simple means to prevent rollers from dropping and separating from one another, in view of the problem with a conventional thrust rolling bearing: that the use of a cover plate for coupling bearing washers together to prevent the rollers from dropping results in a cost increase. SOLUTION: The thrust tapered roller bearing has tapered rollers 4 incorporated between a pair of bearing washers 2 and 3. A solid lubricant 14 is packed between the bearing washers 2 and 3 and all the tapered rollers 4 are coupled and integrated together by the solid lubricant 14 and thus prevented from dropping and separating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust rolling bearing, and more particularly, to a thrust rolling bearing having means for preventing a rolling element from falling off and separating.

[0002]

2. Description of the Related Art Conventional thrust rolling bearings are integral so that the races cannot be separated because the rolling elements inside fall off from the cage when the pair of races is separated. Is conventionally known. FIG. 5A shows an example of this, and the thrust tapered roller bearing 1 includes a pair of races 2, 3, tapered rollers 4, a retainer 5, and a cover plate 6. The raceway grooves 7, 8 are formed on the facing surfaces of the races 2, 3, respectively. The tapered rollers 4 are radially arranged at regular intervals by a retainer 5 and are interposed between the track grooves 7 and 8. The cross section of the cover plate 6 is bent in an inverted L-shape, and the upper surface of one of the races 3 is
And the bearing ring 9 is held by the caulking portion 9 at the tip, so that the bearing rings 2 and 3 are integrated so that they cannot be separated from each other, whereby the tapered roller 4 is held. Dropping from the vessel 5 is prevented. The inside of the bearing is filled with grease as a lubricant.

The cover plate 6 has a function of preventing the tapered rollers 4 from falling off by connecting the races 2 and 3 and a sealing function of preventing dust and the like from entering the inside of the bearing from the outside. Also have.

FIG. 5B shows an example in which the above-described thrust tapered roller bearing 1 is used for a bearing portion of a caster 11 of a bogie 10. Thrust tapered roller bearing 1
Are mounted around a longitudinal axis 13 by upper and lower bearing housings 12,12.

[0005]

As described above, conventionally, as a means for preventing the tapered rollers 4 of the thrust tapered roller bearing 1 from falling off, the cover plate 6 connecting the races 2, 3 has been used. Since the plate 6 is manufactured by pressing a metal plate, the manufacturing cost of the mold causes the cost of the bearing to increase.

Accordingly, an object of the present invention is to reduce costs by simplifying means for preventing a rolling element having a sealing function from falling off.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a thrust rolling bearing in which a rolling element is incorporated between a pair of bearing rings. And the rolling elements were connected to each other by the solid lubricant.

According to the above configuration, the rolling elements are not separated from each other, and even if the bearing ring is separated, the rolling elements maintain a connected state, so that there is no trouble in handling. Further, since the solid lubricant prevents intrusion of dust and the like from the outside, it exerts substantially the same function as the conventional cover plate. In addition, since the production of the cover plate becomes unnecessary, the cost can be reduced.

It is possible to adopt a configuration in which the rolling elements are held at predetermined intervals by a retainer, or a configuration in which the rolling elements are held at predetermined intervals by the solid lubricant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The first embodiment shown in FIGS. 1A to 1C is a thrust tapered roller bearing, and includes a pair of races 2, 3, a tapered roller 4, a cage 5,
And a solid lubricant 14. Each bearing ring 2, 3
The track grooves 7 and 8 are formed on the opposing surface in the same manner as in the conventional example. The tapered rollers 4 are radially arranged at regular intervals by a retainer 5 and are interposed between the track grooves 7 and 8. As shown in FIG. 1 (c), the retainer 5 has comb teeth 15 formed radially from an inner circumferential circle, and the tapered rollers 4 are interposed between the comb teeth 15.

The inside of the thrust tapered roller bearing is filled with a solid lubricant 14 over the entire circumference. This lubricant 1
No. 4 is mainly composed of lubricating grease and ultra-high molecular weight polyethylene and is grease-like at room temperature, but has a property of hardening by heat treatment while retaining a large amount of lubricant (for example, trade name "Polylube") ).

By the hardening of the solid lubricant 14, all the tapered rollers 4 are joined and held by the solid lubricant 14, and the solid lubricant 14 is joined and integrated with the cage 5, and the cage 5 of the tapered rollers 4 is integrated. From falling off is prevented. Of course, the excellent properties of the solid lubricant 14 itself, that is, performance such as little leakage of the lubricant, maintenance free, and sealing effect are exhibited.

A thrust tapered roller bearing according to a second embodiment shown in FIGS. 2A and 2B comprises the above-described races 2 and 3, a tapered roller 4, and a solid lubricant 14. Unlike the case described above, the interval between the tapered rollers 4 is held by the lubricant 14 without using the retainer 5. The tapered rollers 4 are connected to each other by a solid lubricant 14 to prevent separation.

The third embodiment shown in FIG. 3 is a thrust cylindrical roller bearing, and the fourth embodiment shown in FIG. 4 is a thrust needle roller bearing. Each of these is composed of a pair of races 2 and 3, rolling elements (the former is a cylindrical roller 16, the latter is a needle roller 17), and a lubricant 14, and the rolling elements are mutually connected by a solid lubricant 14. And separation is prevented.

[0015]

As described above, according to the present invention, the inside of the thrust rolling bearing is filled with the solid lubricant to prevent the rolling elements from falling off and separating.
The conventional cover plate becomes unnecessary. For this reason, it is possible to reduce the manufacturing cost of the thrust rolling bearing.

Further, the use of the solid lubricant can prevent intrusion of dust and the like, and has an advantage that grease is not leaked and maintenance is free.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a first embodiment. FIG. 1B is a partially-omitted cross-sectional view taken along line bb of FIG. 1A. FIG.

FIG. 2A is a cross-sectional view of the second embodiment. FIG. 2B is a cross-sectional view partially omitted along the line bb in FIG.

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

FIG. 4 is a sectional view of a fourth embodiment.

5A is a cross-sectional view of a conventional example. FIG. 5B is a cross-sectional view of a conventional example in use.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 thrust tapered roller bearing 2 raceway ring 3 raceway ring 4 tapered roller 5 cage 6 cover plate 7 raceway groove 8 raceway groove 9 caulked portion 10 cart 11 caster 12 bearing box 13 longitudinal axis 14 solid lubricant 16 cylindrical roller 17 needle roller

Claims (3)

[Claims] 1. A thrust rolling bearing in which rolling elements are incorporated between a pair of races, a solid lubricant is filled over the entire circumference between the races, and the rolling elements are connected to each other by the solid lubricant. A thrust rolling bearing, characterized in that: 2. The thrust rolling bearing according to claim 1, wherein said rolling elements are held at predetermined intervals by a cage. 3. The thrust rolling bearing according to claim 1, wherein said rolling elements are held at predetermined intervals by said solid lubricant.