JPH03244821A - Underwater bearing device - Google Patents

Abstract

PURPOSE:To improve reliability and safety by installing a ceramics member between a plurality of synthetic resin bearings supporting a rotary shaft, installing an elastic supporting member on the inner peripheral surface of a bearing base metal and gradually reducing the gap between the synthetic resin bearings along the bearing side edge part. CONSTITUTION:An elastic supporting member 2 is supported on the inner peripheral surface of a bearing base metal 1, and a rotary shaft 3 is supported by installing a plurality of synthetic resin bearings 4 which are divided in the peripheral direction on the inner peripheral surface of the elastic supporting member 2. A ceramics member 5 is installed between the synthetic bearings 4, and formed into a tapered form so that the gap between the inner peripheral surface of the bearing base metal 1 and the synthetic resin bearing gradually reduces along the side edge part of the synthetic resin bearing in the peripheral direction. The impact force in the radial direction of the rotary shaft 3 is absorbed by the deformation of the elastic supporting member 2, and the shock applied on the synthetic resin bearing 4 is little. Further, the outer peripheral surface of the synthetic resin bearing 4 gradually reduces along the side edge part in the same direction, and the load of the rotary shaft in eccentricity is taken in share by a ceramics member. Accordingly, reliability and safety are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an underwater bearing device used, for example, as a water-lubricated bearing in a hydraulic machine such as a water wheel or a pump water wheel.

(Prior art) Submersible bearing devices used in this type of water-lubricated bearings that have already been proposed are generally bearings that support a rotating shaft using water or seawater as a lubricant. significantly lower viscosity compared to

Therefore, the load capacity (the weight of the rotating shaft that can be supported by the pressure of the lubricating fluid in the bearing) is small, and the lubricating film is damaged during transitions such as when starting or stopping the rotating shaft, or when a sudden external force is applied to the rotating shaft. It has the disadvantage of making it easier. As a countermeasure for this, the above-mentioned water-lubricated bearing has a
Materials that do not cause any immediate abnormalities are used.

In other words, the above-mentioned water-lubricated bearings include a bearing equipped with a lubricating means for supplying grease or lubricating oil using a metal material such as white metal, and a lubricating means for supplying fresh water using a soft synthetic resin such as phenolic resin. A bearing equipped with a water supply means has been proposed.

(Problem to be Solved by the Invention) However, since the water-lubricated bearing using the above-mentioned lubricating means for supplying grease or lubricating oil uses grease or lubricating oil, this grease or lubricating oil may leak into rivers. It causes environmental pollution and there are problems with collection and maintenance of the oil supply and drainage system.

On the other hand, water-lubricated bearings using a lubricating water supply means that uses synthetic resin such as phenol resin to supply fresh water use synthetic resin such as phenol resin, and bearings made of resin have low wear resistance, especially when used in slurry. If water containing such substances is used as a lubricant, there are problems with reliability and safety as a bearing material from a long-term perspective.

On the other hand, hard rubber bearings developed as marine bearings can respond to foreign objects by deforming the rubber. However, the effect of removing foreign matter is limited to the case where water as a lubricant is constantly replenished, and if the supply of water is insufficient for some reason, there is a risk of immediate seizure and burnout.

In addition, since the surface pressure (load per unit area) cannot be large, it is difficult to support a rotating shaft with a high load.Furthermore, in order to reduce the surface pressure, the bearing surface is There are also structural constraints such as the need to set a long length, making it difficult to design with a high degree of freedom.

On the other hand, there has already been proposed a bearing in which a ceramic material having superhard properties is formed into a cylindrical shape and fixed in a bearing casing as a bearing body. However, if a ceramic bearing body is used as is in a bearing device, since the ceramic material itself is not brittle, it is likely to break due to impact or the like, resulting in problems with the reliability and safety of the bearing device.

Furthermore, when the rotating shaft is eccentric, the bearing body that supports the rotating shaft rarely follows and is displaced, so there is a problem that excessive stress acts on the bearing body and the bearing body is easily damaged.

The present invention has been made in view of the above-mentioned circumstances, and
In addition to using a ceramic material that has excellent wear resistance and is not limited by surface pressure, it prevents damage due to brittleness and improves the quality of the bearing as a wear-resistant bearing.In addition, it is stable even when the rotating shaft is eccentric. The purpose of the present invention is to provide a highly reliable and safe underwater bearing device that achieves a stable rotational state.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, an underwater bearing device according to the present invention includes:
An elastic support member installed on the inner peripheral surface of the bearing base metal, a plurality of synthetic resin bearings that are divided and evenly attached in the circumferential direction of the inner peripheral surface of the elastic support member and support the rotating shaft, and the above-mentioned synthetic resin bearings that are adjacent in the circumferential direction. A ceramic material is attached to the inner circumferential surface of the elastic support member between the synthetic resin bearings, and the gap between the inner circumferential surface of the bearing base metal and the outer circumferential surface of the synthetic resin bearing gradually decreases along the circumferential edge on the synthetic resin bearing side. It is characterized by being formed into a tapered shape.

Alternatively, a spring material may be installed between circumferentially adjacent synthetic resin bearings, and a ceramic material may be attached to this spring material.

(Function) According to the underwater bearing device having the above configuration, since the ceramic material with excellent wear resistance is arranged on the inner circumferential surface of the bearing base metal through the elastic support member, it is possible to instantaneously move the bearing in the radial direction. Even if a large impact force is applied to the ceramic material, the impact force is absorbed by the elastic body, so there is little chance of damage to the ceramic material.

Also, there is little loss of wear due to the rotating shaft.

Therefore, when using ceramic materials with low impact resistance, it is possible to effectively utilize the wear resistance of the ceramic material while imparting impact resistance properties with an elastic support member that has elasticity, thereby improving the reliability of the bearing device. Safety can be significantly improved.

(Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an underwater bearing device according to the present invention, and shows an example in which the underwater bearing device is applied to a hydraulic machine such as a pump water wheel, a ship, etc.

The underwater bearing device according to the present embodiment includes an elastic support member 2 installed on the inner peripheral surface of a bearing base metal 1, and an elastic support member 2 that is divided and attached evenly in the circumferential direction of the inner peripheral surface of the elastic support member 2. A ceramic material 5 is attached to the inner circumferential surface of the elastic support member 2 between a plurality of synthetic resin shafts 4 supporting the bearings 3 and the synthetic resin bearings 4 adjacent in the circumferential direction, and the inner circumferential surface of the bearing base metal 1 is The synthetic resin bearing 4 is tapered so that the gap between the synthetic resin bearing 4 and the synthetic resin bearing 4 gradually decreases along the side edges of the synthetic resin bearing 4 in the circumferential direction.

In the underwater bearing device according to this embodiment, when the rotating shaft 3 rotates at high speed, the synthetic resin bearing 4 and the rotating shaft 3 are separated by a lubricating film and held so as not to come into direct contact with each other. However, if an impact force is applied in the radial direction of the rotating shaft 3 for some reason, the impact force is absorbed by the deformation of the elastic support member 2, and the impact force is rarely applied to the synthetic resin bearing 4.

Furthermore, if the rotating shaft 3 rotates eccentrically between the synthetic resin bearing 4 and the circumferentially adjacent synthetic resin bearing 4, it is difficult to isolate the synthetic resin bearing 4 and the rotating shaft 3 by the lubricating film. Therefore, the rotating shaft 3 and the synthetic resin bearing 4 are in contact with each other. According to this embodiment, the synthetic resin bearing 4 is formed in a tapered shape so that the outer circumferential surface gradually decreases along the side edges in the circumferential direction. Approach Gold 1. At this time, due to the deformation of the elastic support member 2, the ceramic material 5 attached to the elastic support member 2 moves toward the rotation shaft 3 and comes into contact with the rotation shaft 3, transferring the load of the rotation shaft 3 to the synthetic resin bearing. Since it is supported by the synthetic resin bearing 4 and the ceramic material 5, the amount of wear on the synthetic resin bearing 4 can be reduced. Note that the rotating shaft 3 is coated with cemented carbide 6.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, instead of the elastic support member 2 (see FIG. 1), a spring material 7 is installed on the inner peripheral surface of the bearing base metal 1, and the ceramic material 5 is attached to the spring material 7. It is. Therefore, this embodiment also exhibits the same effects as the embodiment shown in FIG.

〔Effect of the invention〕

As explained above, according to the underwater bearing device according to the present invention, the ceramic material with excellent wear resistance is arranged on the inner peripheral surface of the bearing base metal through the elastic support member, so that Even when a large impact force is applied to the rotary shaft, the impact force is absorbed by the elastic support member, so that the ceramic material is less likely to be damaged and there is also less loss of weight due to abrasion caused by the rotating shaft.

As described above, according to the underwater bearing device according to the present invention, when using ceramic materials with low wear resistance, the wear resistance characteristics of the ceramic materials can be effectively exhibited while imparting impact resistance characteristics with the elastic support member having elasticity. This makes it possible to reduce the amount of wear on synthetic resin bearings and significantly improve the reliability and safety of bearing devices.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of an underwater bearing device according to the present invention, and FIG. 2 is a sectional view showing another embodiment. 1... Bearing base metal, 2... Elastic support member, 3...
-Rotating shaft, 4...Synthetic resin bearing, 5...Ceramics material, 6...Cemented carbide, 7.Spring material.

Claims (2)

[Claims] (1) An elastic support member installed on the inner peripheral surface of the bearing base metal, a plurality of synthetic resin bearings that are divided and evenly attached in the circumferential direction of the inner peripheral surface of the elastic support member and support the rotating shaft, and A ceramic material is attached to the inner circumferential surface of the elastic support member between the adjacent synthetic resin bearings, and the gap between the inner circumferential surface of the bearing base metal and the outer circumferential surface of the synthetic resin bearing is at the synthetic resin bearing side end in the circumferential direction. An underwater bearing device characterized by being formed into a tapered shape so as to gradually decrease along the length. (2) A plurality of synthetic resin bearings are provided on the inner peripheral surface of the bearing base metal, divided in the circumferential direction and equally attached to support the rotating shaft, and the outer peripheral surface of the synthetic resin bearings and the inner peripheral surface of the bearing base metal are connected to each other. A gap is formed in a tapered shape that gradually decreases along the circumferential edge of the synthetic resin bearing, a spring material is installed between the synthetic resin bearings adjacent in the circumferential direction, and a ceramic material is attached to the spring material. An underwater bearing device featuring: