JPS588980Y2 - cylindrical roller bearing - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cylindrical roller bearing having a stepped race.

Bearings that perform oscillating motion, such as those used in the oscillating shaft of Roche mills (pulverizers), may suffer from fretting corrosion (fine wear) on the race surface of the bearing.

In other words, as a result of frequent rocking motion, the race surface that is in contact with the rollers may wear out prematurely due to lubrication, due to the contact ridges of the rollers. In this case, the axial movement of the inner and outer rings is restricted, and in the case of the bearing used for the swing shaft of the Rossier mill mentioned above, irregular movement is inevitably also accompanied in the axial direction during swing motion.
If the rocking motion is hindered and the thrust load due to the axial movement becomes excessive, the collar may be damaged, resulting in the failure of the bearing to function as a cylindrical roller bearing.

Incidentally, even with crowning on both sides of the race surface, the stepped wear described above cannot be avoided, resulting in the same drawback.

This invention is an improvement on the above-mentioned conventional drawbacks. Especially in the case of bearings that perform rocking motion accompanied by axial movement, even if some fretting corrosion occurs,
This idea focuses on the fact that if the stepped wear described above does not occur on the race surface, the above-mentioned rocking motion can be performed without any trouble, and therefore the performance of the above-mentioned bearing can be improved. The following is an explanation according to the accompanying drawings showing examples.

In the drawings, 1 is an inner ring of a double-row cylindrical roller bearing having an inner flange 1a, outer flange 1b and 1c at the center and both ends, 2 is an outer ring,
3 and 4 are cylindrical rollers, and 5 is a cage.

The outer ring 2 has a lubricating oil supply hole 2a in the center, and race surfaces 2e and 2f smaller than the effective contact width of the rollers 3 and 4 on both sides of the lubricating oil supply hole 2a.
Race surfaces 2e, 2 are provided on both sides of 2f, that is, at the center and on the inner periphery of both ends.
There are stepped portions 2b, 2c and 2d recessed from f.

The stepped portions 2b, 2c and 2d have race surfaces 2e and 2f widths shorter than the length of the rollers, unlike the generally provided crowning of the rollers, and have stepped portions from both ends of the race surfaces 2e and 2f. It is characterized by being recessed in the attached state.

In the embodiments, a double-row cylindrical roller bearing has been described, but the same applies to a single-row cylindrical roller bearing shown in FIG.

As is clear from the above structure, the cylindrical roller bearing according to this invention has a flange on either the inner or outer bearing ring, in which the cylindrical rollers are straight and not rounded, and the cylindrical rollers on the non-flange side are straight. Since a linear race surface that is smaller than the effective contact width of the cylindrical rollers and is not crowned is formed on the raceway ring, and stepped portions recessed from the race surface are formed on both sides of the race surface of the raceway ring, Even if the race surface of the raceway ring on the non-flange side wears out, the axial movement of the inner and outer rings is not hindered.

That is, in the case 1 in which the race surface is flush with the stepped portions on both sides, step wear does not occur on the race surface, and the axial movement of the inner and outer rings is not impaired.

Further, even if the race surface wears, the contact area with the rollers remains constant, so rotational torque does not increase.

Therefore, the following effects occur.

That is, (1) in a bearing that swings and also requires movement in the axial direction, even if fretting occurs, the movement in the axial direction is not hindered (no jamming occurs).

(2) Since lubricating oil accumulates in the stepped part even when moving in the axial direction,
There is no gnawing.

(3) The space during grinding and finishing is narrow, making it economical.

(4) Since the edge of the roller does not touch the race surface, it has the effect of avoiding misalignment.

(5) Since the race end is stepped, assembly becomes easy.

(6) Oil easily enters the inside from the stepped part.

(7) Since the contact length is short, torque is small and heat generation is small.

(8) Abrasion powder generated by rocking, etc. is likely to be swept out of the race surface.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a double-row cylindrical roller bearing showing a specific embodiment of this invention, and FIG. 2 is a cross-sectional view of a single-row cylindrical roller bearing. 1...Inner ring, 2...Outer ring, 2b, 2c, 2d...
Stepped portion, 2e, 2f... Race surface, 3, 4... Cylindrical roller, 5... Cage.

Claims (1)

[Scope of utility model registration request] In a cylindrical roller bearing that has a flange on either the inner or outer bearing ring, the cylindrical rollers are straight and not crowned, and the bearing ring on the non-flange side is smaller than the effective contact width of the cylindrical rollers and is not crowned. 1. A cylindrical roller bearing characterized in that a straight race surface is formed, and stepped portions recessed from the race surface are formed on both sides of the race surface of the bearing ring.