JP2516476Y2 - Rubber bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rubber bearing in which the inner peripheral surface of a cylindrical metal shell is coated with rubber, such as a cutless bearing for seawater pumps.

[Prior Art] Such a conventional rubber bearing is generally designated by reference numeral 1 in FIG. In this bearing 1, a rubber lining 3 is adhered, vulcanized and coated on the inner peripheral surface of a cylindrical metal shell 2. Here, in order to have seawater resistance, the material of the metal shell 2 is austenitic SUS304.
(SCS13) or SUS316 (SCS14) is used.

However, when the rubber bearing as shown in FIG. 2 is used in liquid, especially in seawater, crevice corrosion is generated from the connection part of the cylindrical end face on the metal shell 2 side between the metal shell 2 and the rubber lining 3. However, there is a problem in that peeling occurs at the boundary surface C and the life of the rubber bearing is significantly shortened.

On the other hand, it is conceivable that the entire metallic shell 2 is made of a crevice corrosion resistant material, but the crevice corrosion resistant material is expensive, and thus the cost is high and it is not practical.

As another prior art, for example, a microfilm of Japanese Utility Model Application No. 52-34413 (Japanese Utility Model Application Laid-Open No. 53-130347) discloses a rubber bearing provided with a step portion for stopping peeling of rubber. However, this technique is intended to prevent the peeling of rubber from advancing, and is not intended to prevent the peeling of rubber. Therefore, when the shell corrodes at the interface with the rubber, the rubber peels off, and at that time, the rubber rotates together with the shaft, and the function as the rubber bearing is not fulfilled.

Further, JP-A-58-216759 discloses a technique in which a corrosion resistant material is built up. However, this technique is a peeling prevention technique when the joint is entirely covered with a lining, and is not intended to prevent peeling at the joint end face between the metal and the lining material. Therefore, it is impossible to apply this technique to rubber bearings.

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above-mentioned problems of the prior art. In the both ends of the metal shell in the longitudinal direction, between the rubber on the inner peripheral surface side of the shell. It is an object of the present invention to provide a rubber bearing in which peeling does not occur and manufacturing cost does not increase.

[Means for Solving the Problems] A rubber bearing of the present invention is a rubber bearing in which the inner peripheral surface of a cylindrical metal shell is coated with rubber, and the boundary between the longitudinal end portions of the metal shell and the rubber coating layer. A crevice corrosion-resistant metal material is welded on the outer sides in the radial direction of both ends in the longitudinal direction of the rubber coating layer so that the portion does not come into contact with the working fluid.

Here, working fluid means seawater in the case of a seawater pump. In other words, the working fluid means a liquid or fluid handled by the pump to which the rubber bearing of the present invention is applied.

[Preferred Embodiment] As the material of the metal shell, 300 series austenitic stainless steel is preferably used.

Also, as the crevice corrosion resistant metal material, a nickel-based alloy, which is a nickel-based alloy to which chromium and molybdenum are added, and Klevalloy (trademark), triballoy in which molybdenum, chromium, and silicon are added to a base of cobalt or nickel. (Trademark) type alloys are preferably used.

Further, the rubber is preferably coated on the inner peripheral surface of the metal shell by a method such as adhesion or vulcanization.

[Explanation of Operation and Effect] According to the present invention having the above-mentioned configuration, the inner peripheral surface of the shell is made of metal so that the boundary between the longitudinal ends of the shell and the rubber coating layer does not come into contact with the working fluid. Since the crevice corrosion resistant metal material is welded and built up on the outside in the radial direction at both ends of the rubber located at, even when the rubber bearing is used in a liquid (working fluid such as seawater), Although rubber end faces are formed on both end faces of the rubber bearing, the interface between the metal shell and the rubber does not come into direct contact with the working fluid such as seawater. Therefore, crevice corrosion does not occur from the boundary surface, and peeling of the boundary surface between the metal shell and rubber does not occur.

Here, the crevice corrosion-resistant metal material is welded to both ends of the metal shell, more specifically, to the outer ends in the radial direction of the rubber located on the inner peripheral surface of the shell in the radial direction. It is only built up and its usage is relatively small. Therefore, even if an expensive crevice corrosion resistant metal material is used, the manufacturing cost does not increase.

Further, since the crevice corrosion resistant metal material is welded and built up, the boundary between the crevice corrosion resistant metal material and the metal shell is not melted or welded to form a gap.

In addition, a crevice corrosion resistant metal material can be appropriately selected to prevent the diffusion of harmful elements into the stainless steel. Alternatively, by controlling the heat input for welding, reducing the carbon content of the metal shell material, and performing heat treatment after welding, it is possible to prevent the metal shell material from being sensitized in the heat-affected portion of the weld overlay. Further, the weld overlay does not impair the corrosion resistance of the metal shell material. When the present invention is applied to a pump, both end faces of the metal shell need to be used as pushing margins when the pump is assembled or disassembled.
It is preferable that the tough metal is exposed.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1A and 1B.

In FIG. 1A, the rubber bearing according to the present invention has a reference numeral 10 as a whole.
And includes a metal shell 12 and a rubber lining 14 coated on its inner peripheral surface. And, at both ends of the metal shell 12 in the axial direction, there is a crevice corrosion resistant metal material.
16 are built up.

As is clear from FIG. 1A and FIG. 1B, the boundary surface C (FIG. 1A) between the metal shell 12 and the rubber lining 14 is not exposed to the outside, and the clearance Only the interface C1 between the corrosive metal material 16 and the rubber lining 14 is exposed. Here, since crevice corrosion is unlikely to occur in the crevice corrosion resistant metal material 16 and peeling is unlikely to occur at the boundary surface C1, liquid (seawater) is not present at the boundary surface C between the metal shell 12 and the rubber lining 14. There is no contact and no crevice corrosion occurs, so no peeling occurs.

In addition to this, the crevice resistant material 16 is a metal shell 12
Since it is used only at both ends, its usage is relatively small.

Further, as shown in FIG. 1 (A), since both end surfaces D of the metallic shell 12 are made of a crevice corrosion resistant metallic material,
When implemented in a pump, it can provide a push allowance during assembly and disassembly of the pump.

[Effects of the present invention] The effects of the present invention are listed below.

(1) The liquid (seawater) does not contact the interface between the metal shell and the rubber lining, and crevice corrosion does not occur in the metal shell.

(2) Peeling does not occur because crevice corrosion does not occur at the interface between the crevice corrosion resistant metal material and the rubber lining.

(3) The life of the rubber bearing is extended.

(4) The amount of expensive crevice corrosion resistant material used is small, and the manufacturing cost is low.

(5) Compared with the conventional rubber bearing, its structure does not become unnecessarily complicated.

(6) Crevice corrosion and peeling do not occur at the interface between the metal shell and the crevice corrosion resistant material.

(7) When the present invention is applied to a pump, a crevice corrosion resistant metal material is welded on both end surfaces of the metal shell,
A good pressing margin can be obtained during assembly and disassembly.

[Brief description of drawings]

FIG. 1A is a side sectional view showing one embodiment of the present invention, and FIG. 1B
2A is a side sectional view showing the prior art, and FIG. 2B is a B arrow view of FIG. 2A. 1,10 …… Rubber bearings 2,12 …… Metal shells 3,14
…… Rubber (lining), 16 …… Gap corrosion resistant metallic material, C, C1 …… Boundary surface, D …… End surface

Claims (1)

(57) [Scope of utility model registration request] 1. A rubber bearing in which a cylindrical metal shell is coated with rubber on its inner peripheral surface so that the boundary between the longitudinal end portions of the metal shell and the rubber coating layer does not come into contact with the working fluid. A rubber bearing, characterized in that a crevice corrosion-resistant metal material is built up by welding on the outer sides in the radial direction at both longitudinal ends of the coating layer.