JPS6141529A - Manufacture of rubber sleeve - Google Patents

Abstract

PURPOSE:To prevent problems due to overlapping of reinforcing members and occurrence of cracks in inner and outer rubber layer surfaces, by winding reinforcing layr forming materials each of which has an edge rubber having a certain width at least one side thereof in the cord width direction helically on the outer side of a vulcanized or unvulcanized inner rubber layer. CONSTITUTION:An inner rubber layer forming material 5, reinforcing layer forming materials 6, 6 and an outer rubber layer forming material 7 are placed away from a mandrel successively on a molding table 1 with prescribed intervals between them. Each reinforcing layer forming material 6 has an edge rubber with a certain width at leat one side of its width, and is placed on the molding table 1 slantly in such a manner that the reinforcing layer forming materials 6, 6 are overlapped at the central part of the edge rubber 6a. Then the mandrel 2 is rotated and moved relative to the molding table 1, so that the layer forming materials 5, 6, 7 are wound around the mandrel 2 successively to form the unvulcanized inner rubber layer, the reinforcing double layers, and the outer rubber layer.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a rubber sleeve having an inner rubber layer, a reinforcing layer, and an outer rubber layer, and is suitable for use as a diaphragm of an air spring, for example. The present invention relates to a manufacturing method.

(Prior Art) Diameter 7 of an air spring that has been widely used in recent years... A conventionally known rubber sleeve used as a ram 1 is a reinforcing member in the form of a band formed inside and outside of a cylinder made of rubber, for example. This reinforcing layer is formed by embedding them in a spiral shape so as to be symmetrical to each other at an interaxial angle of 80° to 60°, to prevent punctures of the cylindrical body.

In order to prevent a decrease in manufacturing accuracy due to winding misalignment,
In the axial direction of the cylinder, the widthwise end portion of each reinforcing member is 1
Since they are overlapped with a width of ~10W, when using a rubber sleeve, the stiffness of each overlapped part of the reinforcing member is 1.0% higher than that of other parts. .

This change in rigidity along the length of the cylinder causes localized stress concentration on the diaphragm, and this stress concentration often causes diaphragm failure.
There was a problem that the overlapping part of the supplementary member was exposed from the cylindrical body and air leaked from there.

Therefore, the applicant first proposed a method (Japanese Utility Model Application No. Sho 58-168752 C Utility Application No. Sho Fi 7-60441), in which the width direction edges of the reinforcing members were not overlapped, in other words, the width direction edges were brought into contact with each other. Let it happen! ... is a rubber sleeve that is spirally wound with some separation between the sleeves.

According to this rubber sleeve, the problem caused by the reinforcing members overlapping in the width direction can be sufficiently and effectively solved.

(C) Problems to be Solved by the Invention) However, on the other hand, the technology for manufacturing the rubber sleeve proposed earlier by the applicant as expected has not yet been established, and in particular, the intersection angle of the reinforcing member cannot always be adjusted. Since it is extremely difficult to reliably set the predetermined value, the edges of the reinforcing members in the width direction should be brought into contact with each other. .

Although the intention was to have the edges touch each other, the end portions in the width direction would end up overlapping, and even though the edges in the width direction were intended to be separated from each other by a predetermined distance, a gap of more than a predetermined distance would result between those edges. Depending on the former phenomenon, it is 1- compared to conventional rubber sleeves.

A similar problem occurs due to the latter phenomenon. During vulcanization, at least one of the inner rubber layer and the outer rubber layer flows into the inner rubber layer and the outer rubber layer into the inner rubber layer. There was a problem in that cracking occurred on either or both of the surface and the outer surface of the outer rubber layer.

The present invention advantageously solves the problems of the prior art, and even if some error occurs in the spiral winding angle of the reinforcing member, the problem caused by the overlap of the reinforcing member and the problem of the inner and outer rubber layer surfaces can be solved. Raw cracks.

The present invention provides a method for manufacturing a rubber sleeve that does not cause damage.

(Means for Solving the Problems) The method for manufacturing a rubber sleeve according to the present invention has the following advantages: 1. In particular, when a blind weave cord is coated with rubber. .

In addition, by spirally winding a reinforcing layer forming material, which can be configured by providing an ear rubber of a constant width on at least one side in the width direction of the cord, around the outside of the vulcanized or unvulcanized inner rubber layer, In other words, the embedded portion of the cord in the reinforcing layer forming material forms an unvulcanized reinforcing layer that overlaps only with the ear rubber or contacts the side end surface of the ear rubber.

(Function) In this manufacturing method, since the ear rubber is present at the side end of the reinforcing layer forming material, one reinforcing layer forming material is added at the center of the ear rubber having an appropriately selected width of 2. When the cords are spirally wound to overlap each other, even if the spiral winding angle is somewhat different from the expected angle, the overlap between the cord-embedded portions of the reinforcing layer forming material and the reinforcing layer forming material side edge,

This effectively prevents the edges from separating from each other. In other words, by selecting the ear rubber width in anticipation of deviations in the spiral winding angle, even if the maximum deviation occurs, the cord in the reinforcing layer forming material will be able to bury the cord in the adjacent reinforcing layer forming material. It is adjacent to the part, and 1° is in contact with the end surface on the side of the ear rubber.

(Example) This invention will be explained below based on the drawings.

FIG. 1 is a plan view illustrating an embodiment of the present invention;
In the figure, 1 is a molding table, and 2 is a mandrel placed on the molding table 1 in contact with the molding table 1. This mandrel 2 is rotatably supported at both ends by bearings 8, 8. , and each of these bearings is oriented in the length direction of the molding table 1, and the guide rail 4 is placed on the molding table 1 in the direction perpendicular to the mandrel axis. .
You will be guided at 4.4.

Here, when forming the unvulcanized inner rubber layer, reinforcing layer, and outer rubber layer on the mandrel 2, first, the inner rubber layer forming material 6, the reinforcing layer forming material 6.6, and the reinforcing layer forming material 6.6 are placed on the molding table 1. The outer rubber layer forming materials 7 are sequentially arranged from the mandrel side at predetermined intervals 11, respectively.

As the reinforcing layer forming material 6 here, for example, a material obtained by applying a rubber coating to a blind weave cord can be used, and this reinforcing layer forming material 6 is such that the card is aligned with one axis of the rubber sleeve to be formed. In this example, the molding table 1 is arranged so as to form a predetermined angle with respect to the length direction of the molding table 1. In this example, two The reinforcing layer forming materials 6.6 are arranged, but the number of the reinforcing layer forming materials 6.6 can be changed as needed.
...Of course it can be changed.

Furthermore, the reinforcing layer forming material 6.6 in the present invention has an ear rubber having a constant width as required on one side or both sides in the width direction (in the illustrated example, one side). Reinforcement layer forming material 6.

For example, at the time of spiral winding, the reinforcing layer forming material 6 is arranged on the forming table 1 at an inclination angle such that the reinforcing layer forming material 6 overlaps each other at the center of the ear rubber 6a in its width direction.

Then, the rotational movement of the mandrel 2 and the forming table 1. .

1, each layer-forming material 5, 6.7 is wound sequentially around the outside of the mandrel 2, based on their inherent adhesive strength, forming an unvulcanized inner rubber layer and a reinforcing layer of the two layers. and an outer rubber layer, respectively.

Here, the materials 5 and 7, which are arranged without tilting with respect to the forming table 1, are not changed in their arrangement posture depending on the action of external force on the materials 5 and 7 when they are wound around the outside of the mandrel. On the other hand, the reinforcing layer forming material 6 is tilted and arranged on the molding table 1.
is subjected to an external force in a compressive or tensile direction due to the indirect contact of the mandrel 6 thereto, and in many cases, its disposition is somewhat changed.

However, in the present invention, even if the posture of the reinforcing layer forming material 6 is changed due to the presence of the ear rubber 6a whose width is selected in consideration of the change in posture, after the spiral winding,
The cord-embedded portions of the material 6 do not overlap each other, and conversely, the pieces 6 are never separated from each other in the width direction.

In other words, the reinforcing layer forming material 6 is
Receives an external force in the compression direction from the mandrel 2 as shown in
The inclination angle α with respect to the axis of the forming table increases, and the material 6 is placed in the above-mentioned arrangement position by 1°, that is, the material 6 is arranged to overlap in the width direction at the center of the ear rubber 6a in its wound state. Even if the posture is changed significantly, the reinforcing layer forming material 6 after winding remains intact between the cord-embedded part and the ear rubber side, as is clear from the inner reinforcing layer 16a shown in the cross-sectional view in Fig. 2. It will come into contact with the end face, and no large gap will occur between them. Conversely, when the reinforcing layer forming material 6 receives an external force in the tensile direction and its inclination angle α becomes small, the material 6 after spiral winding is
As is clear from the outer reinforcing layer 16b in the figure, only the ear rubber portion overlaps with the cord-embedded portion, and the cord-embedded portions do not overlap with each other.

As described above, when the reinforcing layer forming material 6 receives external forces in both compression and tension directions from the mandrel 2, 1. .

However, when forming the reinforcing layers 16a and 16b, it is common for only one of the external forces to act on the material 6. It is possible to set the posture to a posture that can compensate only for the change in posture in either direction.In other words, the cord-embedded portion of the material 6 can be placed in an arrangement posture in which it comes into contact with the ear rubber side end surface, or the cord-embedded portion is in the position of the material 6. As a result, the width of the ear rubber can be narrowed and the material flow can be improved.2.
Wear.

Note that the unvulcanized reinforcing layer 16a as described above.

16b can be formed regardless of whether or not the inner rubber layer 15 is vulcanized, and these reinforcing layers 16a,
16b is after the outer rubber layer 17 is formed.

By vulcanization, each layer is bonded to each other.

(Effects of the Invention) Therefore, according to the present invention, even if the posture of the reinforcing layer forming material placed on the molding table changes to some extent, the overlap between the cord embedded portions and the width direction of the reinforcing layer forming material It is possible to reliably prevent the rubber sleeve from separating, and the durability of the rubber sleeve can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating an embodiment of the present invention, and FIG. 2 is an axial cross-sectional view showing a rubber sleeve according to the present invention. 5... Inner rubber layer forming material 6... Reinforcement layer forming material 7
...Outer rubber layer forming material, 15...Inner rubber layer 16
a, 16b... Reinforcement layer, 17... External rubber layer. Patent applicant Brideston Co., Ltd. (11' +

Claims (1)

[Claims] 1. When manufacturing a rubber sleeve having an inner rubber layer, a reinforcing layer, and an outer rubber layer, on the outside of the vulcanized or unvulcanized inner rubber layer, at least one side in the width direction has a constant width. By spirally winding a reinforcing layer forming material having an ear rubber, a cord within the reinforcing layer forming material forms an unvulcanized reinforcing layer that overlaps only with the ear rubber or contacts the side end surface of the ear rubber. A method of manufacturing a rubber sleeve, characterized by: