JPH0632752U - Air-cooled bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the outflow of bearing lubricant and to extend the life of the bearing by the air cooling function. [Structure] The bearing box 2 is provided with an air supply port 5,
The sealing means between the rotary shaft 1 and the rotary shaft 1 is constituted by the labyrinth seal 7, and the bearing 3 is filled with so-called plastic grease 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air-cooled bearing device, and is mainly an air-cooled bearing device suitable for steel table rollers, rolling mill roll necks, and the like.

[0002]

[Prior art]

 Bearing devices used for steel table rollers, rolling mill roll necks, etc. are equipped with a bearing box around the rotating shaft, with a rolling bearing interposed between the rotating shaft and the bearing box. A labyrinth seal is provided between the shaft and the shaft. Grease lubrication or oil mist lubrication is used to lubricate the above bearings.

[0003]

[Problems to be solved by the device]

 When grease lubrication is applied to the bearing device as described above, the leaked grease and the grease remaining during cleaning cause stains around the bearing device. In addition, even if an external seal is installed, ingress of water such as cooling water is unavoidable, and there is no action to cool the inside of the bearing to lower the bearing temperature. It is necessary to replenish and replace various greases.

Further, in the case of oil mist lubrication, there is a flow of oil mist, so there is some cooling effect, but it is difficult to reduce the oil content contained in the drain mist discharged to the outside to zero. There is a problem of polluting the air around the bearing device.

Therefore, an object of the present invention is to provide a bearing device that eliminates the inconvenience caused by grease lubrication and oil-miss lubrication and has an air cooling action.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is directed to a rotary shaft and a bearing housing mounted around the rotary shaft, a rolling bearing interposed between the rotary shaft and the bearing box, and a space between the bearing box and the rotary shaft. In the bearing device including the sealing means interposed in the above, the bearing box is provided with an air supply port, the sealing means is constituted by a labyrinth seal, and ultra high molecular weight polyethylene or ultra high molecular weight is provided inside the rolling bearing. It is configured to be filled with a solid lubricating composition (hereinafter referred to as "plastic grease") composed of a mixture of polyolefin and lubricating grease.

[0007]

[Action]

 The pressurized air supplied from the air supply port cools the inside of the bearing and is discharged to the outside from the labyrinth seal. The plastic grease lubricates the bearing with oil that gradually exudes from now on, but since it is a solid substance, it is not discharged to the outside by pressurized air. The air discharged from the labyrinth seal, on the other hand, blocks the ingress of water and other foreign matter.

[0008]

【Example】

 The bearing device according to the first embodiment shown in FIG. 1 includes a rotary shaft 1, a bearing box 2 mounted around the shaft end of the rotary shaft 1, and an interposition between the rotary shaft 1 and the bearing box 2. It has a self-aligning roller bearing 3. Further, one end of the bearing box 2 is closed by a blind lid 4, and the rotating shaft 1 penetrates the other end. An air supply port 5 is provided on the outer peripheral surface of the bearing box 2 near the blind lid 4.

A labyrinth seal member 6 is attached to an outer diameter surface of a portion of the rotating shaft 1 penetrating the bearing housing 2. The labyrinth seal member 6 forms a labyrinth seal 7 with a concave convex surface on the inner peripheral surface of the end of the bearing box 2.

The self-aligning roller bearing 3 is interposed between an inner ring 8 fitted and fixed on the outer peripheral surface of the rotating shaft 1, an outer ring 9 fitted and fixed on the inner peripheral surface of the bearing housing 2, and both. It is composed of two rows of rollers 10 and a cage 11 of each roller 10.

The internal space of the bearing 3 is filled with the plastic grease 12 described above. The plastic grease 12 is 95 to 1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and lubricating grease 5 to 99 wt% having a dropping point higher than the gelation temperature of the ultrahigh molecular weight polyethylene. %, And the mixture was filled in the predetermined space, heated to a temperature higher than the gelling temperature of the ultrahigh molecular weight polyethylene, and then cooled and solidified (see Japanese Patent Publication No. 63-23239).

[0012] 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 bearing device of the first embodiment is as described above, and the bearing 3 is lubricated by the oil gradually leaching from the plastic grease 12. The pressurized air supplied from the air supply port 5 passes through the gap between the inner and outer rings 8, 9 and 10 and the gap between the inner and outer rings 8, 9 and the plastic grease 12 to the inside of the bearing 3 to produce the labyrinth. It is discharged from the seal 7 to the outside. At this time, the air takes heat generated in the bearing 3 to cool it.

Further, water and other foreign matters that enter the inside of the bearing housing 2 from the labyrinth seal 7 are blocked by the air discharged from the labyrinth seal 7, and the entry is prevented.

The bearing device of the second embodiment shown in FIG. 2 is of a type in which the rotary shaft 1 penetrates both sides of the bearing housing 2. In this case, the air supply port 5'is provided in the central portion of the outer peripheral surface of the bearing box 2 and communicates with the air hole 13 provided in the central portion of the outer ring 9 of the bearing 3. Further, similar labyrinth seals 7 and 7'are formed between the inner diameter surface of both ends of the bearing box 2 and the rotary shaft 1, respectively.

In this case, the pressurized air supplied from the air supply port 5'is divided into both sides and is discharged to the outside from both labyrinth seals 7 and 7 '.

In the bearing device of the third embodiment shown in FIG. 3, one of the sealing means of the bearing box 2 causes the seal member 14 mounted on the inner peripheral surface of the end of the bearing box 2 to contact around the rotary shaft 1. This is the case for contact seals.

In this case, the air supply port 5 is formed close to the sealing member 14 side as in the case of the first embodiment described above. The pressurized air supplied from the air supply port 5 traverses the bearing 3 and is discharged from one labyrinth seal 7.

[0020]

[Effect of device]

 As described above, according to the present invention, since lubrication is performed by using the plastic grease which is a solid composition, there is no risk of the grease leaking to the outside, and therefore the bearing periphery can be kept clean.

Further, the air-cooling action can lower the bearing temperature and prevent foreign matter from entering by the air discharged to the outside, so that the life of the bearing can be extended.

[Submission date] October 26, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention is directed to a rotary shaft and a bearing housing mounted around the rotary shaft, a rolling bearing interposed between the rotary shaft and the bearing box, and a space between the bearing box and the rotary shaft. In the bearing device including the sealing means interposed in the rolling bearing, the bearing box is provided with an air supply port, the sealing means is constituted by a labyrinth seal, and the ultrahigh molecular weight polyolefin and the lubricating grease are provided inside the rolling bearing. It is configured to be filled with a solid lubricating composition composed of a mixture (hereinafter referred to as "plastic grease").

[Brief description of drawings]

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

FIG. 2 is a sectional view of a second embodiment.

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

[Explanation of symbols] 1 rotating shaft 2 bearing box 3 bearing 4 blind cover 5, 5'air supply port 6 labyrinth seal member 7, 7'labyrinth seal 8 inner ring 9 outer ring 10 roller 11 cage 12 plastic grease 13 air hole 14 seal Element

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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. A rotary shaft and a bearing box mounted around the rotary shaft, a rolling bearing interposed between the rotary shaft and the bearing box,
And a sealing device interposed between the bearing box and the rotating shaft, wherein the bearing box is provided with an air supply port, and the sealing means is constituted by a labyrinth seal, and the superposition is provided inside the rolling bearing. An air-cooled bearing device filled with a solid lubricating composition comprising a mixture of high-molecular-weight polyethylene or ultra-high-molecular-weight polyolefin and lubricating grease.