JPH0632745U - Lubricating sealing device for bearings - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lubrication sealing device that eliminates the outflow of grease used for lubricating a bearing and exerts a sealing effect without using a sealing member. [Structure] Grooves 7 and 8 are provided on both sides of each raceway 3 and 4 of an inner ring 1 and an outer ring 2 of a bearing, and the inner ring 1 including the grooves 7 and 8 is provided.
A so-called plastic grease 12 is filled between the inner surfaces of the outer ring 2 and the outer ring 2 facing each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating and sealing device for a bearing.

[0002]

[Prior art]

 An example of a conventional lubrication and sealing device for a bearing will be described with reference to FIG. FIG. 2 shows a well-known deep groove ball bearing, in which balls 6 held at regular intervals by a retainer 5 can be freely rolled between raceways 3 and 4 provided on opposing surfaces of an inner ring 1 and an outer ring 2. Intervening.

Further, grooves 7 and 8 are formed on both sides of the tracks 3 and 4 on the inner peripheral surfaces of the inner ring 1 and the outer ring 2, respectively, and the outer peripheral edges of the annular seal member 9 are formed in the grooves 7 and 8 of the outer ring 2. The lip 10 which is fitted and bifurcated at the inner peripheral edge thereof is pressed against both side edges of the grooves 7 and 8 of the inner ring 1.

Cores 11 and 11 are integrally provided on the inner surfaces of the seal members 9 and 9, respectively.

Further, the space inside the seal members 9 and 9 is filled with grease.

The seal member 9 prevents grease from flowing out and prevents foreign matter from entering from the outside.

[0007]

[Problems to be solved by the device]

 In the bearing as described above, frictional sliding occurs between the lip 10 of the seal member 9 and the inner peripheral surface of the inner ring 1, so that the lip 10 gradually wears out, and finally the outflow of grease and the intrusion of foreign matter are completely prevented. It may not be possible to prevent it.

Therefore, an object of the present invention is to solve the above problems and provide a lubrication sealing device for a bearing that can maintain a lubrication sealing function for a long period of time.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a bearing in which rolling elements are interposed between an inner race and an outer race, and circumferential grooves are provided on both sides of the races of the respective races. The gap between the opposing inner surfaces is filled with a solid lubricating composition (hereinafter referred to as a plastic grease) composed of ultra-high molecular weight polyethylene or a mixture of ultra-high molecular weight polyolefin and lubricating grease.

[0010]

[Action]

 The above-mentioned plastic grease gradually exudes oil to lubricate the rolling elements. The gap between the plastic grease and the concave surface of the groove on the inner and outer races forms a labyrinth gap to prevent foreign matter from entering.

[0011]

【Example】

 The ball bearing shown in FIG. 1 is provided with the tracks 3 and 4 on the facing surfaces of the inner ring 1 and the outer ring 2, and the ball bearing held by the cage 5 between the tracks 3 and 4 as in the conventional case. 6 is a deep groove ball bearing.

Grooves 7 and 8 similar to the conventional ones are provided on both sides of each track 3 and 4, respectively.

The space between the facing inner surfaces of the inner ring 1 and the outer ring 2 is filled with the above-mentioned plastic grease 12 including the above-mentioned grooves 7 and 8.

The above plastic grease 12 is a lubricating grease having 95-1 wt% of ultra-high molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and a dropping point higher than the gelation temperature of the ultra-high molecular weight polyethylene. After filling the above-mentioned space with a mixture consisting of 5 to 99 wt%, the mixture was heated to above the gelation temperature of the ultrahigh molecular weight polyethylene and then cooled and solidified (see Japanese Patent Publication No. 63-23239). ).

[0015] Other examples of plastic greases, particle size 1 to lubricating grease 5～99Wt% with an average molecular weight of about ^{1 × 10 6 ~5 × 1 0} 6 ultra high molecular weight high dropping point above the gelling point of the polyolefin It is also possible to mix 95 to 1 wt% of the ultra-high molecular weight polyolefin powder of 100 μm and disperse and hold it at a temperature equal to or higher than the gel point.

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

The plastic grease 12 is a solid lubricating composition as described above and gradually exudes oil to lubricate the inside of the bearing. In addition, foreign matter that enters the gaps between the plastic grease 12 and the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2 has labyrinth gaps in the grooves 7 and 8. Blocked at.

Although the deep groove ball bearing has been described above, the present invention can be applied to a lubricating and sealing device for various bearings.

[0019]

[Effect of device]

 As described above, according to the present invention, circumferential grooves are provided on both sides of each race, and plastic grease is filled between the facing inner surfaces of each race including these grooves, so the bearing interior is lubricated with the plastic grease. To be done. In addition, since the plastic grease is a solid lubricating composition, it does not flow out, and in the grooves on both sides, the gap between the groove recess and the plastic grease becomes a labyrinth gap, which exerts a sealing effect. It can be omitted.

[Submission date] October 26, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention provides a bearing in which rolling elements are interposed between an inner race and an outer race, and circumferential grooves are provided on both sides of the races of the respective races. The gap between the opposing inner surfaces is filled with a solid lubricating composition (hereinafter referred to as plastic grease) composed of a mixture of ultra- high molecular weight polyolefin and lubricating grease.

[Brief description of drawings]

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

FIG. 2 is a partially omitted sectional view of a conventional example.

[Explanation of symbols] 1 inner ring 2 outer ring 3, 4 orbit 5 cage 6 balls 7, 8 groove 9 seal member 10 lip 11 core metal 12 plastic grease

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[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]

Claims (1)

[Scope of utility model registration request] 1. In a bearing having rolling elements interposed between inner and outer races, circumferential grooves are provided on both sides of the races of the respective races, and a gap between opposed inner surfaces of the respective races including the groove is provided. A lubricating and sealing device for a bearing, which is filled with a solid lubricating composition comprising a mixture of ultra-high molecular weight polyethylene or ultra-high molecular weight polyolefin and lubricating grease.