JP2585135Y2 - Rolling bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing, and more particularly to a ball bearing for a polygon scanner motor used for a laser printer, a laser beam facsimile or the like.

[0002]

2. Description of the Related Art Bearings for polygon scanner motors are required to have characteristics such as low torque and low torque fluctuation. For this reason,
In conventional grease-filled ball bearings, measures are taken by lowering the viscosity of the base oil or reducing the amount of grease.

[0003]

However, according to the grease lubrication, it is unavoidable that the torque increases due to the stirring resistance of the grease or the torque fluctuation increases, and it is difficult to sufficiently cope with the improvement of the required characteristics. ing. On the other hand, in order to satisfy the demand for longer life of the bearing, it is necessary to increase the base oil viscosity and increase the amount of grease.
This is inconsistent with the above method. As described above, while the bearing is moving at high speed and high temperature, lubrication with grease has a problem that cannot be solved.

[0004] Therefore, an object of the present invention is to solve these problems by a method instead of grease lubrication.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a rolling bearing having a rolling element interposed between an inner ring and an outer ring at fixed intervals by a retainer. A lubricating member is fitted to a pillar portion between the rolling element holding portions, and the lubricating member is formed of a solid lubricating composition (hereinafter, referred to as a plastic grease) composed of a mixture of an ultrahigh molecular weight polyolefin and a lubricating grease. It is what it was.

[0006]

When the lubricating member made of plastic grease rotates at a high speed together with the retainer by use of the above-mentioned rolling bearing, oil oozes out of the plastic grease, and the oil is used to lubricate the bearing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The ball bearing of the embodiment shown in FIGS. 1 and 2 has a rolling element 4 interposed between an inner ring 1 and an outer ring 2 at a predetermined interval by a retainer 3, and the inner ring 1 Rotating with the shaft, the outer ring 2 is integrated with the bearing housing.

A lubricating member 6 is fitted to a column 9 between the rolling element holding portions 8 of the retainer 3. The lubricating member 6 has a hole 10 for fitting around the column 9, a narrow opening 11 is provided in a part of the hole 10, and a surface facing the opening 11 is formed as a tapered surface 12. The column 9 also has a tapered surface 13.

When the tapered surface 12 of the lubricating member 6 is pressed against the tapered surface 13 of the column portion 9 and pushed in strongly, the opening 11 is expanded and the column portion 9 is fitted into the hole 10. Then, the opening 11 returns to the original state due to the elasticity of the lubricating member 6 itself, thereby preventing the lubricating member 6 from coming off.

The lubricating member 6 is made of plastic grease. This plastic grease is composed of 95 to 1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ , and 5 to 99 wt% of lubricating grease having a drop point higher than the gelation temperature of the ultrahigh molecular weight polyethylene. Is filled into a predetermined mold, heated to a temperature higher than the gelling temperature of the ultrahigh molecular weight polyethylene, then cooled and solidified, and demolded.

As another example of a plastic grease, lubricating grease having a drop point higher than the gel point of an ultra-high molecular weight polyolefin having an average molecular weight of about 1 × 10 ⁶ 5 × 10 ⁶ is added to 5-99 wt% of a lubricating grease having a particle size of 1-100 μm. The ultrahigh molecular weight polyolefin powder of 95 to 1 wt% 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.

When the ball bearing of each of the above embodiments is used, for example, as a bearing for a polygon scanner motor, the lubricating member 6 rotates at a high speed together with the retainer 3 and the plastic grease forming the lubricating member 6 has centrifugal force and vibration. Under the influence, oil oozes out, and the oil lubricates the rolling surface.

[0014]

[Effects of the Invention] As described above, in the present invention, the lubricating member fitted to the pillar portion of the retainer of the bearing is formed of plastic grease. In addition, there is no need for detailed management at the time of grease filling, and further, there is no danger of grease scattering when the bearing rotates at high speed.

Further, the motor does not require initial aging (stabilizing operation), and only the oil oozing out of the plastic grease exists in the rolling elements and the raceway surface, so that the torque fluctuation is very small. Further, since there is no possibility of torque fluctuation, there is the convenience that the type of plastic grease can be appropriately selected.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view of a first embodiment.

FIG. 2 is a partially exploded sectional view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Retainer 4 Rolling element 6 Lubricating member 8 Rolling element holding part 9 Column part 10 Hole 11 Opening 12 Tapered surface 13 Tapered surface

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI C10N 40:02 50:08 50:10

Claims (1)

(57) [Scope of request for utility model registration] In a rolling bearing having a rolling element held at a predetermined interval by an retainer between an inner ring and an outer ring, a pillar portion between the rolling element holding sections of the retainer.
A lubricating member is fitted to the rolling bearing, and the lubricating member is formed of a solid lubricating composition comprising a mixture of an ultrahigh molecular weight polyolefin and a lubricating grease.