JPH0968229A - Manufacture of rubber bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture even by a user side a rubber bearing which dispenses with the finishing process such as grinding, in which the manufacturing cost is reduced, and whose inner surface is smooth and highly precise. SOLUTION: The polyurethane resin rubber 5A of normal temperature hardening type is poured and hardened between an inner circumferential surface of a metallic shell 1 and an outer circumferential surface to which the releasing agent 3 of a core 2 is applied in the condition in which the metallic shell 1 is positioned and held in a concentric manner with the core 2 in which the releasing agent 3 is applied to the outer circumferential surface so as to obtain the outer diameter equal to the finished inner diameter of the rubber bearing to be manufactured. A cylindrical rubber body to be fitted and fixed to the inner circumferential side of the metallic shell 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a method of manufacturing a rubber bearing, and more particularly to a submersible bearing of a pump, etc., so as to exert a cushioning function between a shaft or a sleeve fitted on the shaft. Further, the present invention relates to a method for manufacturing a rubber bearing in which a tubular rubber body is fitted and fixed to the inner peripheral side of a metal shell.

[0002]

2. Description of the Related Art In a conventional rubber bearing of this type, a tubular rubber body and a metal shell are manufactured separately, and then the tubular rubber body is fitted on the inner peripheral side of the metal shell to connect the two. It was manufactured by fixing with an adhesive.

[0003]

The conventional rubber bearing manufactured as described above causes rattling or uneven wear between the outer peripheral surface of the cylindrical rubber body and the inner peripheral surface of the metal shell due to uneven contact. In order to prevent the occurrence of a gap that causes the above, the outer diameter of the tubular rubber body is formed to be slightly larger than the inner diameter of the metal shell, and such a tubular rubber body is elastically contracted and deformed. However, since the inner surface of the rubber shell is fitted and adhered, the inner surface of the rubber body easily undergoes strain deformation, and the inner surface of the rubber body is obtained in order to eliminate such strain deformation and obtain a predetermined finished inner diameter. A complicated and highly accurate finishing process such as polishing is required, and it is difficult for the user side such as a pump manufacturer to manufacture, and it is necessary to rely on manufacturing by a bearing manufacturer, which reduces the manufacturing cost. When it gets higher There was a problem.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and it is possible to reduce the manufacturing cost by eliminating the finishing process such as polishing, but the inner surface is smooth and the precision is high. It is an object of the present invention to provide a method for manufacturing a rubber bearing that allows the rubber bearing to be easily manufactured on the user side as well.

[0005]

In order to achieve the above object, a method of manufacturing a rubber bearing according to the present invention comprises a metal shell and a cylindrical rubber fitted and fixed to the inner peripheral side of the metal shell. A method of manufacturing a rubber bearing consisting of a body, which concentrically positions and holds the metal shell and a mold core whose outer peripheral surface is coated with a mold release agent so as to have an outer diameter equal to the finished inner diameter of the rubber bearing. Then, in this state, the room temperature curable polyurethane resin-based rubber is injected between the inner peripheral surface of the metal shell and the outer peripheral surface of the mold core coated with the mold release agent to cure the cylindrical rubber body. Is formed.

Here, the mold release agent is a mixture of paraffin hydrocarbon with addition of normal propanol and hydrated aluminosilicate. Particularly, the paste containing paraffin hydrocarbon at 70 wt% or more is used. By making it into a shape, it is possible to make the releasability superior to that of the liquid. In addition, as the constituent material of the mold core, it is preferable to use a thermoplastic such as polypropylene or vinyl chloride that is melted by applying heat.

Further, as the room temperature curable polyurethane resin type rubber, a main agent composed of a mixture of methylenebis-4-cyclohexyl isocyanate (PICM) and a polyether prepolymer of PICM and the like, an aromatic amine, a polyalkylene glycol and an aromatic amine are used. By mixing with a curing agent consisting of a eutectic mixture and a mixture of carbon black to cause a chemical reaction, it cures and extends in 12 to 24 hours at room temperature of 20 to 25 ° C., and has high elasticity, tensile strength and tear strength. In addition, it becomes a rubber elastic body having excellent wear resistance and chemical resistance. Specifically, the product name of "IT W Industry Co., Ltd.", "Devcon Flexan 80P, Flexan 8"
0L, Flexan 94L "and the like.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing each component prepared before manufacturing the rubber bearing according to the present invention. In FIG. 1, reference numeral 1 is a metal shell, and a cylindrical portion 1a and It is composed of a flange portion 1b formed so as to project radially outward from one end portion of the tubular portion 1a in the axial direction. Reference numeral 2 denotes a mold core formed of a thermoplastic such as polypropylene into a cylindrical shape. In addition to this, the above-mentioned mold release agent and room temperature curable polyurethane resin-based rubber are prepared.

FIG. 2 is a longitudinal sectional view showing a state where a rubber bearing is manufactured by using each of the above-mentioned preparations. In FIG. 2, 4 is an outer diameter of the cylindrical portion 1a of the metal shell 1. And a through hole 4b having an inner diameter equal to, and a depth equal to the axial length of the tubular portion 1a, and a through hole 4b having an inner diameter equal to the diameter d0 of the mold core 2. The metal shell 1 is fitted in the recess 4a of the manufacturing positioning tool 4, and the mold core 2 is inserted and held in the through hole 4b to position and hold the two cores 1 and 2 concentrically. In this state, An outer diameter d equal to the finished inner diameter D of the rubber bearing to be manufactured by applying the above-mentioned release agent to the outer peripheral surface portion of the mold core 2 corresponding to the inner peripheral surface of the tubular portion 1a of the metal shell 1 After forming the release layer 3 having a thickness t (d-d0) of By injecting the room temperature curable polyurethane resin-based rubber 5A into the annular space between the inner peripheral surface of the tubular portion 1a of FIG. 1 and the release layer 3 corresponding thereto and curing it at room temperature, As shown in FIG. 3, a rubber bearing 6 in which a tubular rubber body 5 is fitted and fixed to the inner peripheral side of the metal shell 1 is manufactured.

The rubber bearing 6 manufactured in this way is
Due to the presence of the release layer 3, the inner surface of the cylindrical rubber body 5 is made smooth and is finished to a predetermined finish inner diameter D with high precision, so that no finishing step such as polishing is required. Therefore, for example, a pump manufacturer. On the user side as well, it is possible to easily manufacture the above-mentioned constituent elements 1 and 2, the constituent material, and the positioning tool 4, if necessary, simply by preparing them.

[0011]

As described above, according to the present invention, the cylindrical rubber body fitted and fixed to the inner peripheral side of the metal shell is provided with the inner peripheral surface of the metal shell and the release agent corresponding thereto. By forming and curing the room temperature curing type polyurethane resin rubber between the outer surface of the mold core and curing, the inner surface of the cylindrical rubber body can be finished into a perfect circle with a smooth surface without distortion or deformation. Therefore, it is possible to reduce the manufacturing cost by eliminating the need for a complicated and highly accurate finishing process such as polishing. Further, therefore, it is possible to easily manufacture a highly accurate rubber bearing even on the user side such as a pump manufacturer.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of each component prepared before manufacturing a rubber bearing according to the present invention.

FIG. 2 is a vertical sectional view showing a manufacturing state of a rubber bearing.

FIG. 3 is a vertical sectional view of a manufactured rubber bearing.

[Explanation of symbols]

 1 Metal Shell 2 Type Core 3 Release Layer (Release Agent) 5 Cylindrical Rubber Body 5A Room Temperature Curable Polyurethane Resin Rubber 6 Rubber Bearing

Claims (1)

[Claims] 1. A method of manufacturing a rubber bearing comprising a metal shell and a tubular rubber fitted and fixed to an inner peripheral side of the metal shell, wherein a finish inner diameter of the metal shell and the rubber bearing is The mold core coated with a mold release agent on the outer peripheral surface is positioned and held concentrically so as to have the same outer diameter, and in this state, the mold mold release agent for the inner peripheral surface of the metal shell and the mold core is coated. A method for producing a rubber bearing, characterized in that a room temperature curable polyurethane resin-based rubber is injected between the outer peripheral surface and the cured outer peripheral surface and cured to form the tubular rubber body.