JPH07243448A - Pivotally rolling bearing - Google Patents

Abstract

PURPOSE:To provide a pivotally rolling bearing which is excellent in durability under a severe condition compared to a conventional pivotally rolling bearing, inexpensive compared to a ceramic bearing, and suitable for usage under the condition that a bearing having a usual structure shows problem in durability but not so high durability, such as in the ceramic bearing, is required. CONSTITUTION:An inner ring 2 and an outer ring 3 are made of stainless steel. Seal members 9, 10 blocking a gap 6 between the inner and outer rings are each made of ring plate-like polytetrafuluoroethyrene material. The seal members 9, 10 are fastened to the inner ring 2 or the outer ring 3 under the state of being sandwiched by means of metal backup plates 11, 12 from rear surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slewing rolling bearing, and more particularly to a slewing rolling bearing used in a bad environment.

[0002]

2. Description of the Related Art It is common practice to provide a sealing material at the opening of the gap between the inner ring and the outer ring of a slewing rolling bearing for the purpose of preventing dust and water. A rubber material such as rubber is used. But like a corrosive gas atmosphere or seawater,
If the environment in which the slewing rolling bearing is installed is very bad,
Sufficient durability cannot be obtained with conventional slewing rolling bearings provided with a rubber sealing material. Therefore, a ceramic bearing is used as a bearing used in a very bad environment such as a corrosive gas atmosphere or seawater.

[0003]

The ceramic bearings are
It has excellent durability under adverse environment, but it is very expensive. Therefore, the present invention is far superior in durability under adverse environment as compared with the conventional normal structure slewing rolling bearing, and is much cheaper than the ceramic bearing, and is durable in the normal structure bearing. It is an object of the present invention to obtain a slewing rolling bearing that is particularly suitable for use in an environment in which the durability of the bearing is not required to be as high as that of a ceramic bearing, although there is a problem in performance.

[0004]

In a slewing rolling bearing according to the present invention, an inner ring 2 and an outer ring 3 are made of a stainless material, and a sealing material 9 for closing a gap 6 between the inner ring and the outer ring,
10 is formed of a polytetrafluoroethylene material in the form of a ring plate, and the sealing materials 9 and 10 are fastened to the inner ring 2 or the outer ring 3 while being sandwiched from the back by metal backup plates 11 and 12. It is characterized by that.

The seal members 9 and 10 and the backup plates 11 and 12 are mounted by fixing one side thereof, that is, the inner diameter side or the outer diameter side to the inner ring 2 or the outer ring 3. On the other side of the sealing materials 9, 10, that is, on the outer diameter side when the inner diameter side is fixed, or on the inner diameter side front surface (the surface facing the bearing) when the outer diameter side is fixed, a lip protruding in a circumferential ridge shape. 15, 16
Is provided, and the lips 15 and 16 slidably contact the end surface of the outer ring 3 or the inner ring 2.

The sealing materials 9 and 10 are housed in ring-shaped grooves 7 and 8 formed so as to straddle the opening of the gap 6 between the outer ring 3 and the inner ring 2, and the backup plates 11 and 12 are formed in the grooves 7 and 8. 8 is attached so as to close the outside.

[0007]

In the slewing rolling bearing having the above structure, the outer ring 3 and the inner ring 2 are made of stainless steel, and the sealing materials 9 and 10 are made of polytetrafluoroethylene having high chemical stability. Compared to bearings with a structure, it has excellent corrosion resistance and deterioration resistance in adverse environments and exhibits high durability. In addition, it is easier and cheaper to manufacture than a ceramic bearing.

Further, by using the backup plates 11 and 12, the sealing materials 9 and 10 made of polytetrafluoroethylene are used.
Since it was fixed while sandwiched from the back, the sealing material 9,
10 is stably held, and the stability of the contact state between the seal materials 9 and 10 and the outer ring 3 or the inner ring 2 is also excellent.

Further, since the seal members 9 and 10 are housed in the grooves 7 and 8 and the grooves 7 and 8 are covered with the backup plates 11 and 12, the contact portions between the seal members 9 and 10 and the outer ring 3 or the inner ring 2 are made. Dust and the like will not penetrate into the product, improving durability.

[0010]

FIG. 1 shows an embodiment of the present invention. Inner ring 2 and outer ring 3 holding the rolling element 1 of the bearing
Is made of stainless steel, and each of them is provided with a screw hole 4 and a drill hole 5 for fixing them. The gaps 6 between the outer ring 3 and the inner ring 2 are open on the upper and lower surfaces of the bearing, respectively. Ring-shaped grooves 7 and 8 are provided in the inner ring 2 and the outer ring 3 so as to straddle the opening, and ring-shaped seal members 9 and 10 made of polytetrafluoroethylene are mounted in the grooves 7 and 8. There is. This sealing material 9, 10
Further, ring-shaped metal backup plates 11 and 12 are attached to the outer side of.

The seal material 9 and the backup plate 11 on the upper side of the bearing are fixed to the inner ring 2 by screws 12 on the inner diameter side thereof.
Is fastened to. That is, the seal material 9 is fixed in a state of being sandwiched between the backup plate 11 and the bottom surface of the groove 7 on the inner ring side, and the outer diameter side front surface (the surface facing the bearing side) thereof.
Is in sliding contact with the bottom surface of the groove 7 on the outer ring side. This sealing material 9
A circumferential ridge-shaped lip 15 slightly protruding downward is provided on the outer diameter side front surface of the outer peripheral surface of the groove 7, and the lip 15 is in contact with the bottom surface of the groove 7 on the outer ring side. The outer diameter side back surface (the backup plate side) of the seal material 9 is cut off obliquely to give flexibility to the outer diameter side of the seal material 9. There is a step slightly larger than the thickness of the backup plate 11 between the upper surface of the inner ring 2 and the upper surface of the outer ring 3, and the backup plate 1 mounted so that the outer surface is flush with the upper surface of the inner ring.
The outer diameter side front surface of No. 1 faces the upper surface of the outer ring, leaving a slight gap.

The seal material 10 and the backup plate 12 on the lower side of the bearing are fastened to the outer ring 3 by screws 14 on the outer diameter side thereof. That is, the sealing material 10 is fixed in a state of being sandwiched between the backup plate 12 and the bottom surface of the groove 8 on the outer ring side, and the front surface on the inner diameter side (the surface facing the bearing side) slides on the bottom surface of the groove 8 on the inner ring side. Touching. A circumferential ridge-shaped lip 16 slightly protruding upward is provided on the inner diameter side front surface of the sealing material, and the lip 16 is in contact with the inner ring side bottom surface of the groove 8. The inner diameter side back surface (backup plate side) of the sealing material 10 is cut off obliquely to give flexibility to the inner diameter side of the sealing material 10. There is a step slightly larger than the thickness of the backup plate 12 between the lower surface of the outer ring 3 and the lower surface of the inner ring 2, and the inner diameter side of the backup plate 12 mounted so that the outer surface is flush with the lower surface of the outer ring. The front surface faces the lower surface of the inner ring, leaving a slight gap.

As shown in FIG. 2, the inner ring 2 is provided with an L-shaped grease hole 18 communicating with the guide groove of the rolling element 1, and a grease nipple 19 is attached to the opening end thereof.

[0014]

According to the structure of the present invention described above,
Compared with conventional ceramic rolling bearings, swiveling rolling bearings can be obtained that have much higher durability in adverse environments than conventional rolling bearings, and can be provided at a much lower cost than ceramic bearings. It is possible to obtain a bearing which is particularly suitable as a slewing rolling bearing which is used in a bad environment which does not require the chemical resistance.

Further, by adopting a peculiar structure as the mounting structure of the sealing material, it is possible to obtain more excellent durability in a bad environment and to easily manufacture and assemble and exhibit stable sealing performance.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an embodiment.

FIG. 2 is a sectional view of a main part of the embodiment at a position different from that of FIG.

[Explanation of symbols]

 2 Inner ring 3 Outer ring 6 Gap 7,8 Groove 9,10 Sealing material 11,12 Backup plate 15,16 Lip

Claims (1)

[Claims] 1. A slewing rolling bearing equipped with a sealing material (9, 10) for closing an opening end of a gap (6) between an inner ring (2) and an outer ring (3), wherein an inner ring (2) and an outer ring (3) are provided. ) Is a stainless steel material, and the sealing material (9,10) is a ring-plate-shaped polytetrafluoroethylene material.The sealing material (9,10) is sandwiched from the back by a metal backup plate (11,12). Slewing rolling bearing, characterized in that it is fastened to the inner ring (2) or the outer ring (3) in the locked state.