JPH0651537U - Self-aligning plain bearing unit - Google Patents

Abstract

(57) [Summary] [Purpose] Excellent bearing durability is obtained even when used under adverse conditions. [Structure] A bearing box 2 having a circumferential bearing guide groove having an arcuate cross section, a cylindrical sleeve 8, and an outer peripheral surface formed in an arcuate cross section which is interposed between the bearing box and the sleeve. A self-aligning slide bearing unit composed of a cylindrical slide bearing ring 6 slidingly contacting a groove, wherein a bearing box and a sleeve are made of austenitic stainless steel, and a slide bearing ring is made of a sintered bearing alloy. Self-aligning plain bearing unit. The material of the sintered bearing alloy is bronze alloy, lead bronze alloy, special bronze alloy, Ni-Cu-Fe.
Alloys, iron-based alloys, Fe-Ni alloys, Ni-based alloys, etc. It is effective to uniformly and finely disperse the solid lubricant in the sintered bearing alloy. As the solid lubricant, graphite, molybdenum disulfide, tungsten disulfide, or boron nitride is preferably used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a self-aligning plain bearing unit, and in particular, it is used in an environment that is affected by various liquids due to contact, adhesion, etc., in contact with various atmospheric gases, or in an environment exposed to high temperatures. It concerns a plain bearing unit.

[0002]

[Prior Art and Problems to be Solved by the Invention]

 Conventionally, ball bearings are often used in the above-mentioned environment, which is not preferable for metal materials. However, the ball bearing has a drawback of being unreliable due to a so-called locking phenomenon in which its function suddenly stops during use. On the other hand, with sliding bearings, the locking phenomenon does not occur like with ball bearings, but when used under adverse conditions such as high temperature, high humidity, and no lubrication, the wear of the sliding parts is severe and the durability is extremely poor. There is. If the sliding part is worn, the rotating shaft supported by the bearing will not rotate smoothly, and an abnormal load will be applied to the drive mechanism components, resulting in early damage.

The present invention was created under such a technical background, and an object thereof is to provide a self-aligning plain bearing unit that exhibits excellent durability even when used under adverse conditions. It is to be. A self-aligning slide bearing unit consists of a bearing box having a circumferential bearing guide groove with an arcuate cross section, a cylindrical sleeve, and the outer periphery of the bearing box, which is interposed between the sleeve and the arcuate cross section. It is usually composed of a sliding bearing ring whose surface is in sliding contact with the bearing guide groove. Generally, the slide bearing ring is made of copper alloy, cast iron, resin material or the like, and the bearing box and the sleeve are made of structural plain steel, cast iron or the like. In order to improve the durability of the self-aligning sliding bearing unit, the present inventors have made efforts to improve the material of the bearing ring, which is easily worn, and obtained a considerable result, but it was not satisfactory. However, when attention was paid to the material of the bearing box, a lot of rust was generated, and these fine rust particles entered the sliding surface, and the bearing ring inside the bearing box became eccentric, resulting in loss of alignment. It was revealed that the wear was accelerated. Therefore, we decided to change the materials of the components other than the bearing ring. The self-aligning plain bearing unit obtained as a result is the following structure, and the object of the present invention can be achieved by this structure.

[0004]

[Means for Solving the Problem and Its Action]

 A bearing box having a circumferential bearing guide groove with an arcuate cross section, a cylindrical sleeve, and an outer peripheral surface formed in an arcuate cross section interposed between the bearing box and the sleeve, and the bearing guide groove described above. It is a self-aligning slide bearing unit consisting of a cylindrical slide bearing ring that slides in contact with, the bearing housing and the sleeve are made of austenitic stainless steel, and the slide bearing ring is made of a sintered bearing alloy. Formed self-aligning plain bearing unit. Bronze-based alloys, lead bronze alloys, special bronze alloys, Ni-Cu-Fe alloys, iron-based alloys, Fe-Ni alloys, Ni-based alloys, etc. are selected as materials for the sintered bearing alloys that make up the plain bearing ring. It is possible to choose. Also, it is effective to disperse the solid lubricant uniformly and finely in the sintered bearing alloy, and it is not necessary to replenish the lubricant from the outside, and stable lubricity is guaranteed throughout use. . As the solid lubricant, graphite, molybdenum sulfide, tungsten sulfide, or boron nitride is preferably used. The solid lubricant is added and mixed as powder or fine particles into the raw material powder of the bearing alloy, pressed together with the bearing alloy, and then sintered. The preferable addition amount of the solid lubricant in the sintered bearing alloy is 1 to 27% by weight, and specifically, 1 to 16% by weight for graphite, 1 to 7% by weight for molybdenum sulfide, and 1 to 7% by weight for boron nitride. In the case of 1 to 10% by weight, in the case of tungsten disulfide, 1 to 27% by weight is suitable.

In using the self-aligning plain bearing unit of the present invention, a rotary shaft is fitted in a cylindrical sleeve, and the rotary shaft rotates together with the sleeve. During the rotation, the sleeve and the slide bearing ring make sliding contact, and the slide bearing ring makes sliding contact with the inner wall surface of the cylindrical bearing guide groove formed in the bearing housing. According to the self-aligning plain bearing unit of the present invention, the durability is remarkably improved as compared with the conventional product, and the environment in which the temperature and humidity are repeatedly changed (room temperature to 130 ° C, It has been confirmed that it has at least 4 times the service life of 2500 to 3000 hours of use under steam to water to dryness. The effect obtained by properly selecting the material of the parts used other than the bearing material is far beyond the range of prediction.

[0006]

【Example】

 The illustrated self-aligning plain bearing unit 1 is mainly composed of a bearing box 2, a plain bearing ring 6 and a cylindrical sleeve 8 both of which are incorporated inside the bearing box 2. The bearing box 2 is made of austenitic stainless steel and includes a base portion 3 fixed to a pedestal (not shown) and a main ring portion 4 having a circular center opening for accommodating the bearing. A circumferential bearing guide groove 5 having an arc-shaped cross section is formed on the inner peripheral wall surface of the central opening of the main ring portion 4. The cylindrical plain bearing ring 6 is made of a sintered bearing alloy made by powder metallurgy, and the outer peripheral surface 7 of which slides in contact with the inner wall surface of the bearing guide groove 5 is formed on the bearing housing 2. The shape is substantially the same as the shape of the guide groove 5. The arcuate shape of the outer peripheral surface 7 in the axial direction has its center of curvature coincident with the axis of the plain bearing ring 6 as a cylindrical body. The slide bearing ring 6 is fitted into the bearing guide groove 5 of the bearing housing 2 in a fitting manner. In the case of the present embodiment, a counterbore is formed on the side of the bearing box 2, the bearing ring 6 is placed sideways into the bearing box, and then the bearing ring is erected to be fitted. The cylindrical sleeve 8 is made of austenitic stainless steel, and is dimensioned so that it can be inserted into the slide bearing ring 6. A flange-shaped protrusion 9 is formed at one end of the sleeve 8 on the outer peripheral side, and the side of the protrusion 9 engages with the side surface of the slide bearing ring 6 in the assembled state.

The self-aligning slide bearing unit having such a structure was applied to an actual sterilization device to examine the durability. The test conditions were such that the temperature was changed in the range from room temperature to 130 ° C., and the environmental atmospheres of steam, water, and drying were repeatedly changed. In the actual machine test, the amount of wear of the plain bearing ring was reduced by 0.1 to 0.2 mm on the inner peripheral surface. On the other hand, in the conventional self-aligning plain bearing device, wear of the plain bearing ring with a thickness reduction of several mm was confirmed under the same conditions, and the sleeve was corroded. The following table shows the material of each bearing device.

[0008]

[Table 1] Table 1

[0009]

[Effect of device]

 According to the self-aligning plain bearing unit of the present invention, the bearing housing and the sleeve are made of austenitic stainless steel, and the plain bearing ring is made of the sintered bearing alloy. Even during use, corrosion of the equipment is effectively prevented, wear of the plain bearing ring is reduced, and its durability can be significantly improved due to its excellent corrosion resistance, wear resistance, and high temperature resistance. .

[Brief description of drawings]

FIG. 1 is a front view of a self-aligning plain bearing unit according to the present invention.

FIG. 2 is a side view of the self-aligning slide bearing unit with its main part broken away.

FIG. 3 is a perspective view of a main part of the self-aligning slide bearing unit.

[Explanation of symbols]

 1 self-aligning sliding bearing unit 2 bearing box, 3 stem portion, 4 main ring portion, 5 bearing guide groove, 6 sliding bearing ring, 7 outer peripheral surface, 8 sleeve, 9 collar-shaped protruding portion

Front page continuation (72) Inventor Munehiko Ito 3-409 Shinmachi, Komaki-shi, Aichi 102 Grace Shinmachi 102 (72) Inventor Toshiya Hashiguchi 2-8-19 Noge, Setagaya-ku, Tokyo Noge Green Corp 301

Claims (4)

[Scope of utility model registration request] 1. A bearing box (2) having a circumferential bearing guide groove having an arcuate cross section, a cylindrical sleeve (8), and an intermediate section formed between the bearing box and the sleeve. In a self-aligning slide bearing unit having a cylindrical slide bearing ring (6) whose outer peripheral surface is in sliding contact with the bearing guide groove, the bearing box and the sleeve are formed of austenitic stainless steel. , A self-aligning slide bearing unit, wherein the slide bearing ring is made of a sintered bearing alloy. 2. The self-aligning sliding bearing unit according to claim 1, wherein the sintered bearing alloy contains a solid lubricant uniformly and finely dispersed therein. 3. The self-aligning sliding bearing unit according to claim 1, wherein the sintered bearing alloy is a bronze-based bearing alloy. 4. The solid lubricant is at least one selected from the group consisting of graphite, molybdenum disulfide, molybdenum sulfide, tungsten sulfide, and boron nitride, and is contained in the sintered bearing alloy in an amount of 1 to 27% by weight. The self-aligning slide bearing unit according to claim 2 or 3, wherein