JPH0586028U - Bearing device - Google Patents

Abstract

(57) [Summary] [Purpose] In a bearing device consisting of a combination of a plummer block and a bearing, the grease filled inside the plummer block in order to supplement the sealing function of the seal member of the plummer block exudes to the outside and stains the surrounding area. In view of the cause of this, the purpose is to prevent this stain. [Structure] Instead of the above grease, a solid lubricating composition 12 composed of a mixture of ultra-high molecular weight polyethylene or ultra-high molecular weight polyolefin and a lubricating grease was filled in the plummer block 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a bearing device using a plummer block.

[0002]

[Prior Art]

 A plummer block that has shaft insertion holes formed in both end walls of the bearing howling and a seal member is provided on the inner diameter surface of each shaft insertion hole, and the center of the plummer block that is common to the above-mentioned bearing insertion holes in the bearing housing. A bearing device including a bearing mounted with an axis is conventionally known (see, for example, Japanese Utility Model Publication No. 55-42049).

In the conventional bearing device as described above, a seal member is provided on the inner diameter surface of the shaft insertion hole in order to prevent water or dust from entering the plummer block. As the seal member, a labyrinth seal member is used in addition to a member such as rubber or felt. Also, in places where there is a lot of water or dust, the above seal members alone do not have a sufficient sealing action, so grease is filled in the plummer block.

[0004]

[Problems to be solved by the device]

 However, when the grease is filled as described above, there is a problem that the grease exudes to the outside of the bearing housing, and dust is attached to the exuded grease to stain the peripheral portion.

Therefore, an object of the present invention is to solve the above-mentioned problems by filling a lubricating composition which is unlikely to seep out, instead of the conventional grease.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention relates to the above-mentioned bearing device, in which the inner surface of the end wall between both sides of the bearing and the seal member is in contact with the outer surface of the shaft of ultra-high molecular weight polyethylene or It is filled with a solid lubricating composition consisting of a mixture of ultra-high molecular weight polyolefin and lubricating grease.

The same lubricating composition may be filled inside the bearing.

[0008]

[Action]

 The lubricating composition filled in the inner surface of the end wall between both sides of the bearing and the seal member so as to make sliding contact with the outer diameter surface of the shaft prevents water and dust from entering through the gap between the seal member and the shaft. And protect the bearings.

Further, the lubricating composition filled inside the bearing performs a lubricating action on the bearing itself.

[0010]

【Example】

 The bearing device of the embodiment shown in FIG. 1 includes a plummer block 1 and a bearing 2.

The plummer block 1 has end walls 4 integrally joined to both ends of the bearing housing 3, and each end wall 4 is provided with a shaft insertion hole 5 having a common axis. A seal member 6 is attached to the inner diameter surface of each shaft insertion hole 5. As the seal member 6, a labyrinth seal member may be used in addition to members such as rubber and felt as in the conventional case.

The bearing 2 is fitted between the inner diameter surface of the bearing housing 3 and the outer diameter surface of the shaft 7 inserted into the shaft insertion hole 5. One surface of the bearing 2 is abutted against the step portion 8 of the shaft 7, and the other surface is a washer 9. The washer 9 is pressed against the bearing 2 by a nut 10 screwed together.

Ribs 11 parallel to both end surfaces of the bearing 2 are formed on the inner diameter surface of the end wall 4, and an annular lubrication is formed on the inner surface of the end wall 4 between the rib 11 and the seal member 6. Composition 12 is loaded. The inner diameter surface of the lubricating composition 12 is brought into sliding contact with the outer diameter surface of the shaft 7. The same lubricating composition 12 is also filled inside the bearing 2.

The above-mentioned lubricating composition is a so-called plastic grease, which comprises 95 wt% to 1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and its ultrahigh molecular weight. A mixture consisting of 5 wt% to 99 wt% of lubricating grease having a dropping point higher than the gelling temperature of polyethylene is filled in the above-mentioned predetermined space and then heated to a temperature above the gelling temperature of the ultra-high molecular weight polyethylene and then cooled. It has been 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 lubricating composition 12 filled in the bearing 2 gives the bearing 2 self-lubricating property with long-term durability. Further, what is filled inside the end wall 4 prevents water and dust that have entered through the gap between the seal member 6 and the shaft 7 from reaching the bearing 2. Further, since the lubricating composition 12 is solid, the composition itself does not exude to the outside.

[0018]

[Effect of the device]

 As described above, according to the present invention, so-called plastic grease is added to the inner surface of the end wall between the bearing and the seal member so as to be in sliding contact with the outer diameter surface of the shaft, thereby further improving the sealing function. In addition, since the oil does not seep out of the bearing device, dust and the like do not adhere and the surrounding area can be kept clean. Further, since the grease supply device is not necessary, the cost of the bearing device can be reduced.

Further, by filling the inside of the bearing with the above-mentioned plastic grease, maintenance-free can be promoted.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

[Explanation of symbols]

 1 Plummer Block 2 Bearing 3 Bearing Housing 4 End Wall 5 Shaft Insertion Hole 6 Seal Member 7 Shaft 8 Step 9 Washer 10 Nut 11 Rib 12 Lubricating Composition

Claims (2)

[Scope of utility model registration request] 1. A plummer block in which a shaft insertion hole is formed in both end walls of a bearing housing and a seal member is provided on an inner diameter surface of each shaft insertion hole, and the shaft insertion holes in the bearing housing of the plummer block. And a bearing mounted with a common central axis line, an ultra high molecular weight polyethylene or an ultra high molecular weight polyolefin slidingly contacting the outer diameter surface of the shaft on the inner surface of the end wall between both sides of the bearing and the seal member. A bearing device characterized by being filled with a solid lubricating composition consisting of a mixture of a lubricant and a lubricating grease. 2. The bearing device according to claim 1, wherein the inside of the bearing is also filled with the lubricating composition.