JPS62128741A - Preparation of rubber bush - Google Patents

Abstract

PURPOSE:To make it possible to increase the hardness of a rubber bush in a center line orthogonal direction without lowering the rotatable angle between an inner cylinder and an outer cylinder, by separately compressing rubbers of layers before integrating the same by inlaying mutually. CONSTITUTION:An inner cylinder 3 and an outer cylinder 4 are arranged in a concentrical circular form and unvalcanized rubber is injected between the inner cylinder 3 and the outer cylinder 4 to be vulcanized to form an inside rubber bush 1 wherein the inner cylinder 3 and the outer cylinder 4 are connected by the uncompressed rubber 5 inserted between the inner cylinder 3 and the outer cylinder 4. In the same way, an outside bush 2 wherein an inner cylinder 7 and an outer cylinder 8 are connected by uncompressed rubber 9 is formed. The outer cylinder 4 is formed so as to have an outer diameter and a wall thickness capable of being adjusted to an outer diameter having a size capable of being introduced into the inner cylinder 7 by drawing processing. A core is introduced into the inner cylinder 7 and the outer cylinder 8 is drawn from the outer periphery thereof to make the diameter thereof small. A core is received in the inner cylinder 3 and the outer cylinder 4 is drawn from the outer periphery thereof so as to obtain an outer diameter capable of being introduced into the inner cylinder 7. Next, the outer cylinder 4 is introduced into the inner cylinder 7 to form a rubber bush.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is mainly used as a buffer member that is inserted in the middle of a rotation transmission shaft and buffers shocks at the start and stop of rotation between the drive shaft and the driven shaft. Regarding rubber boots.

[Conventional technology]

A rubber bushing has a metal inner cylinder and a metal outer cylinder arranged concentrically, and the inner cylinder and the outer cylinder are connected through rubber inserted in a compressed state between the inner cylinder and the outer cylinder. It is publicly known.

In order to increase the rotatable angle between the inner cylinder and the outer cylinder in this rubber bushing, the thickness of the rubber inserted between the inner cylinder and the outer cylinder can be increased. However, when the thickness of the rubber is increased, it becomes difficult to compress the rubber in a manner that reduces the hardness in the direction perpendicular to the center line and reduces the run-out between the shafts. This is because there is a limit to the amount of drawing that can be done to the outer cylinder in order to compress the rubber by squeezing the outer cylinder.

Furthermore, if the amount of compression applied to the rubber is small, there is also the problem that durability is poor.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a rubber bushing that increases the hardness in the direction perpendicular to the center line without reducing the rotatable angle between the inner cylinder and the outer cylinder.

[Means for solving problems]

In order to achieve this object, the present invention has an inner tube in which an inner tube and an outer tube are arranged concentrically, and the inner tube and the outer tube are connected by uncompressed rubber inserted between the inner tube and the outer tube. A rubber bushing and an outer rubber bushing with the same structure are prepared, and the outer cylinder is drawn into a small diameter to compress the rubber between the inner and outer cylinders.The outer cylinder is then drawn into the inner cylinder of the outer rubber bushing. Forming a rubber bushing made of multiple rubber layers by press-fitting the outer cylinder of the inner rubber bushing, which has an outer diameter that can be press-fitted into the inner cylinder of the outer rubber bushing and compressing the rubber between the inner cylinder and the outer cylinder. It is in.

[Effect]

In the present invention, each layer of rubber is compressed separately and then integrated by fitting, so the rubber can be compressed to a greater extent than when each layer of rubber is combined into a single layer, and the rigidity in the direction perpendicular to the centerline is increased. It is possible to manufacture rubber bushings with a large twist angle and a desired twist angle.

〔Example〕

As shown in FIG. 1, an inner cylinder 3 and an outer cylinder 4 are arranged concentrically, and unvulcanized rubber is injected and vulcanized between the inner cylinder 3 and outer cylinder 4. An inner rubber bushing 1 is made in which an inner cylinder 3 and an outer cylinder 4 are connected by an uncompressed rubber 5 inserted between the outer cylinder 4 and the inner cylinder 3. Similarly, the inner cylinder 7 and the outer cylinder 8 are arranged concentrically, and the inner cylinder 7 and the outer cylinder 8 are joined by the uncompressed rubber 9 inserted between the inner cylinder 7 and the outer cylinder 8. Make rubber bush 2. The outer cylinder 4 of the inner rubber bushing 1 has an outer diameter and a wall thickness that can be drawn to a size that can be press-fitted into the inner cylinder 7 of the outer rubber bushing 2. A mandrel is placed in the inner cylinder 7 of the outer rubber bush 2, and the outer cylinder 8 is squeezed from the outer periphery to make the diameter small. A mandrel is placed in the inner cylinder 3 of the inner rubber bushing 1, and the outer cylinder 4 is squeezed from the outer periphery, so that the outer cylinder 4 has an outer diameter that can be press-fitted into the inner cylinder 7 of the outer rubber bush 2. Next, the outer cylinder 4 of the inner rubber bushing 1 is press-fitted into the inner cylinder 7 of the outer rubber bushing 2 to form a rubber bushing as shown in FIG.

In the illustrated example, the rubber bushing is made up of two layers, inner and outer rubber bushings 1 and 2, but it may be made of three layers, four layers, etc.

〔Effect of the invention〕

According to the present invention, the rotatable angle between the innermost inner cylinder and the outermost outer cylinder can be easily increased, and the hardness in the direction perpendicular to the centerline can be increased.

[Brief explanation of drawings]

FIG. 1(a) is a cross-sectional view of the inner rubber bushing with the rubber uncompressed, FIG. 1(b) is a cross-sectional view of the outer rubber bushing with the rubber uncompressed, and FIG. 2 is a cross-sectional view of the outer rubber bushing after assembly by the method of the present invention. FIG. 1.Inner rubber bushing, 2.Outer rubber bushing, 3
．． 7.Inner cylinder, 4.8.Outer cylinder, 5.9.Rubber.

Claims (1)

[Claims] (1) An inner rubber bushing in which an inner cylinder and an outer cylinder are arranged concentrically and the inner cylinder and the outer cylinder are connected by uncompressed rubber inserted between the inner cylinder and the outer cylinder; An outer rubber bush is prepared in which the inner and outer cylinders are arranged concentrically and the inner and outer cylinders are joined by uncompressed rubber inserted between the inner and outer cylinders, and the outer cylinder is reduced to a small diameter by drawing. Inside the inner cylinder of the outer rubber bushing, which has been processed to compress the rubber between the inner cylinder and the outer cylinder, the outer cylinder is drawn to have an outer diameter that can be press-fitted into the inner cylinder of the outer rubber bushing. A method of manufacturing a rubber bushing in which an outer cylinder is press-fitted into an inner rubber bushing made of compressed rubber between the cylinder and the cylinder.