JPH0618730U - Rolling bearing - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate problems caused by grease lubrication in rolling bearings, such as bearings for polygon scanner motors, which require low torque and low torque fluctuation. [Structure] The lubrication member 6 that rotates together with the rotation of the bearing is composed of so-called plastic grease.
The oil content was exuded from the plastic grease by high speed rotation and vibration, and lubricated by the oil content.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rolling bearing, and mainly to a ball bearing for a polygon scanner motor used in a laser printer, a laser beam fax, or the like.

[0002]

[Prior 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, the base oil viscosity is reduced and the amount of grease is reduced.

[0003]

[Problems to be solved by the device]

 However, grease lubrication inevitably increases torque due to grease agitation resistance or torque fluctuations, making it difficult to adequately respond to the improvement in required characteristics. On the other hand, in order to satisfy the demand for longer bearing life, it is necessary to increase the viscosity of the base oil and increase the amount of grease, which is contrary to the above method. As described above, there is a problem that lubrication with grease is difficult to solve as the bearing speed and temperature increase.

Therefore, an object of this invention is to solve these problems by a method instead of grease lubrication.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a rolling bearing in which rolling elements held by a retainer at a constant interval are interposed between an inner ring and an outer ring. A configuration in which an annular lubricating member is fitted on the inner diameter surface, and the lubricating member is formed by a solid lubricating composition (hereinafter referred to as plastic grease) composed of a mixture of ultra-high molecular weight polyethylene or ultra-high molecular weight polyolefin and lubricating grease. It is what

The retainer itself may be made of plastic grease by omitting the lubricating member.

Further, it is also possible to adopt a configuration in which a lubricating member made of plastic grease is fitted to the pillar portion between the rolling element holding portions of the retainer.

[0008]

[Action]

 In the above-mentioned rolling bearing, when a lubricating member made of plastic grease or a retainer made of plastic grease itself rotates at high speed due to its use, oil content oozes out from the plastic grease and the oil content lubricates the bearing.

[0009]

【Example】

 In the ball bearing of the first embodiment shown in FIG. 1, rolling elements 4 held at regular intervals by a retainer 3 are interposed between an inner ring 1 and an outer ring 2, and shields are provided at both ends of an inner diameter surface of the outer ring 2. The plates 5 and 5 are attached, and the inner ring 1 rotates together with the shaft, and the outer ring 2 is integrated with the bearing housing.

An annular lubricating member 6 is fitted on the outer diameter surface of the inner ring 1 between the rolling element 4 and one shield plate 5. There is a slight gap between the outer diameter surface of the lubricating member 6 and the inner diameter surface of the outer ring 2.

The above-mentioned lubrication member 6 is formed of plastic grease. The plastic grease, ultrahigh molecular weight Po Riechiren 95～1Wt% to about 1 × 10 ⁶ ~5 × 10 ⁶ average molecular weight, lubricating grease 5~99wt with the ultra-high molecular weight gelling temperature than has high dropping point of polyethylene %, And the mixture was heated at a temperature not lower than the gelling temperature of the ultrahigh molecular weight polyethylene, then cooled and solidified, and then demolded.

As another example of the plastic grease, 5 to 99 wt% of lubricating grease having a dropping point higher than the gelation point of an ultrahigh molecular weight polyolefin having an average molecular weight of about 1 × 10 ⁶ 5 × 10 ⁶ has a particle size of 1 to 100 μm. It is also possible to mix 95 to 1 wt% of the ultra-high molecular weight polyolefin powder and disperse and hold it at a temperature of the gel point or higher.

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

By forming a recess 7 as shown in FIG. 2 on the side of the lubrication member 6 facing the rolling element 4, the lubrication member 6 can be arranged inside the bearing as much as possible.

The second embodiment shown in FIG. 3 is of a type in which the outer ring 2 rotates, and a lubricating member 6 is fitted on the inner diameter surface of the outer ring 2. Other configurations are similar to those of the first embodiment.

The ball bearing of the third embodiment shown in FIG. 4 is the same as the conventional ball bearing in structure, but is different in that the retainer 3 is formed of the above-mentioned plastic grease.

In the ball bearing of the fourth embodiment shown in FIGS. 5 and 6, a lubricating member 6 ′ is fitted to the column portion 9 between the rolling element holding portions 8 of the retainer 3.

This lubrication member 6 ′ has a hole 10 for fitting around the above-mentioned column portion 9, a narrow opening 11 is provided in a part of the hole 10, and the facing surface of the opening 11 is a tapered surface. 12 is formed, and the tapered portion 13 is also formed on the column portion 9. When the taper surface 12 of the lubricating member 6 ′ is pressed against the tapered surface 13 of the column portion 9 and is strongly pressed, the opening 11 widens and the column portion 19 is fitted in the hole 10. Then, due to the elasticity of the lubricating member 6 ', the opening 11 returns to its original state, and the lubricating member 6'is prevented from slipping out. The above-mentioned lubricating member 6'is also formed of plastic grease.

When the ball bearing of each of the above embodiments is used as a bearing for a polygon scanner motor, for example, in the case of the first embodiment, the lubricating member 6 rotates at high speed together with the inner ring 1, and in the case of the second embodiment. The lubricating member 9 rotates at high speed together with the outer ring 2. Then, the plastic grease forming the lubrication member 6 is affected by centrifugal force and vibration so that oil content oozes out, and the oil content lubricates the rolling surface.

Further, in the case of the third embodiment, the retainer 3 itself is made of plastic grease, and in the case of the fourth embodiment, the lubricating member 6 ′ fitted to the retainer 3 is made of plastic grease. Therefore, as the retainer 3 rotates at high speed, oil also oozes out in this case, and the rolling surface is lubricated.

[0021]

[Effect of device]

 As described above, in the present invention, since the lubricating member or retainer that rotates with the rotation of the bearing is formed of plastic grease, there is no stirring resistance due to grease, which has been a problem in the conventional grease lubrication, and when grease is filled. There is no need for detailed control, and there is no need to worry about grease splashing when the bearing rotates at high speed.

Further, the motor does not require initial aging (stabilization operation), and only the oil exuded from the plastic grease is present in the rolling elements and the raceway surface, and the torque fluctuation is very small. In addition, since there is no risk of torque fluctuations, it is convenient to select the type of plastic grease.

[Submission date] October 26, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a rolling bearing in which rolling elements held by a retainer at a constant interval are interposed between an inner ring and an outer ring. An annular lubricating member is fitted on the inner diameter surface, and the lubricating member is formed of a solid lubricating composition (hereinafter referred to as plastic grease) composed of a mixture of ultra- high molecular weight polyolefin and lubricating grease. is there.

[Brief description of drawings]

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

FIG. 2 is a partially omitted sectional view of a modified example of the above lubricating member.

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

FIG. 4 is a partially omitted sectional view of a third embodiment.

FIG. 5 is a partially omitted front view of the fourth embodiment.

FIG. 6 is a partially exploded sectional view of the fourth embodiment.

[Explanation of symbols]

 1 Inner ring 2 Outer ring 3 Retainer 4 Rolling element 5 Shield plate 6, 6'Lubrication member 7 Recess 8 Rolling element holding part 9 Column part 10 Hole 11 Opening 12 Tapered surface 13 Tapered surface

[Procedure amendment]

[Submission date] October 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

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Claims (3)

[Scope of utility model registration request] 1. A rolling bearing comprising rolling elements held at a constant interval by a retainer between an inner ring and an outer ring, wherein an annular lubricating member is fitted to the outer diameter surface of the inner ring or the inner diameter surface of the outer ring. And a lubrication member formed of a solid lubricating composition comprising a mixture of ultra-high molecular weight polyethylene or ultra-high molecular weight polyolefin and lubricating grease. 2. A rolling bearing comprising rolling elements held at a constant interval by a retainer between an inner ring and an outer ring, wherein the retainer is formed of the solid lubricating composition according to claim 1. Characteristic rolling bearing. 3. In a rolling bearing having rolling elements held at a constant interval by a retainer between an inner ring and an outer ring, a lubricating member is fitted to a column portion between rolling element holding portions of the retainer. A rolling bearing, wherein the lubricating member is formed of the solid lubricating composition according to claim 1.