JPH0414693Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a rubber hose having a spirally wound reinforcing layer. [Prior Art] Manufacturing of reinforced rubber hoses made by spirally wrapping reinforcing materials such as fibers and wires is as shown in Figure 3.
An inner rubber layer 2 is extruded around the outer periphery of a mandrel 1 made of metal, plastic, etc., and a reinforcing material is wound spirally around the outer periphery of the inner rubber layer 2 to form an inner reinforcing layer 3a. One reinforcing material is spirally wound around the outer circumference of the inner reinforcing layer 3a so as to intersect with the reinforcing material of the inner reinforcing layer 3a to form the outer reinforcing layer 3b.
An outer rubber layer 4 is formed on the outer periphery of the outer reinforcing layer 3b.
This is carried out by extrusion molding, further forming a coating layer 5 of plastic or lead on the outer periphery of the outer rubber layer 4, and then heating and vulcanizing. In reinforced rubber hoses vulcanized in this way,
Due to the contraction of the inner reinforcing layer 3a and the outer reinforcing layer 3b, the inner rubber layer 2 passes through the part where the reinforcing materials do not intersect.
tends to bulge out into the outer rubber layer 4. However, in conventional reinforced rubber hoses, each of the reinforcing layers 3a and 3b consists of one reinforcing material, so in order to obtain the desired strength, it is necessary to tightly wrap the reinforcing material, and therefore each of the intersecting reinforcement The opening between the materials became extremely narrow, making it difficult for the inner rubber layer 2 to bulge out from between. Therefore, there was a drawback that the inner rubber layer 2 did not engage with the outer rubber layer 4 due to its bulge, and the adhesive force between the two layers was weak. Furthermore, as a result of aging of the rubber due to heat during heating, the inner rubber layer 2 and the outer rubber layer 4, which have weak adhesive strength, may peel off or become misaligned, leaving behind the reinforcing layers 3a and 3b, resulting in poor sealing performance of the reinforced rubber hose. It had the disadvantage that it was easily damaged. [Problems to be solved by the invention] In view of the above-mentioned conventional circumstances, the present invention solves the problem of adhesive strength between the inner rubber layer and the outer rubber layer in a rubber hose having a reinforcing layer in which a reinforcing material is spirally wound. It also aims to improve sealing performance. [Means for solving the problem] The reinforced rubber hose of the present invention includes an inner rubber layer, an inner reinforcing layer in which two reinforcing materials are aligned and spirally wound around the outer periphery of the inner rubber layer, and an inner reinforcing layer. an outer reinforcing layer in which two reinforcing materials are aligned around the outer periphery and wound spirally so as to intersect with the reinforcing material of the inner reinforcing layer;
and an outer rubber layer formed around the outer periphery of the outer reinforcing layer. It has a protruding part. This reinforced rubber hose can be manufactured by the same method as the conventional method described above, but instead of one reinforcing material, two reinforcing materials are aligned and wound spirally. In this case, by controlling the tension of the two reinforcing materials that are aligned, the two reinforcing materials can be wrapped without twisting. Note that the reinforcing material may be fiber or wire, and the same ones as conventional ones can be used. [Function] In the reinforced rubber hose of the present invention, as shown in FIGS. 1 and 2, the reinforcing materials 6 of the inner reinforcing layer 3a and the outer reinforcing layer 3b are arranged in pairs and spirally wound. , compared with the conventional reinforced rubber hose shown in FIG. 3, if the same spiral braid density is used to obtain the same pressure resistance, the openings between the intersecting reinforcing members 6 will be larger than in the conventional case. If the openings between the reinforcing members 6 become larger, the inner rubber layer 2 will easily bulge out into the outer rubber layer 4 through the openings, and a larger bulging convex portion 7 can be formed. Therefore, as shown in FIG. 2, the inner rubber layer 2 and the outer rubber layer 4 are deeply and firmly interlocked with each other with the reinforcing layer 3 in between, due to the large bulging convex portion 7, so that the inner rubber layer 2 A large adhesive force is obtained between the rubber layer 4 and the outer rubber layer 4, and sealing performance is not impaired even under normal heat aging. Such effects of the present invention are more pronounced when the reinforced rubber hose has a higher spiral braid density. [Example] An example of the reinforced rubber hose of the present invention will be specifically described with reference to FIG. While feeding the mandrel 1 from an unwinding stand, an unvulcanized inner rubber layer 2 is continuously extruded on the outer periphery of the mandrel 1, and a spiral machine is used to form an unvulcanized inner rubber layer 2 on the outer periphery of the inner rubber layer 2.

[Table] For each of the prototype reinforced rubber hoses, the adhesive strength between the inner rubber layer and the reinforcing layer and between the reinforcing layer and the outer rubber layer was measured. Furthermore, the sealing properties were examined under normal conditions and after heat aging at 125°C for 200 hours.

【table】

[Effect of idea]

According to the present invention, the bulging convex portion of the inner rubber layer that bulges into the outer rubber layer through the opening between the crossed reinforcing members can be enlarged, so that the inner rubber layer and the outer rubber layer are firmly bonded. It is possible to provide a reinforced rubber hose with a spiral-wound reinforcing layer that has excellent adhesive strength and sealing properties.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the reinforced rubber hose of the present invention with each layer cut away. FIG. 2 is a cross-sectional view of the reinforced rubber hose shown in FIG. 1, where a is a cross-section taken along line A-A including the intersection of the reinforcing material in FIG. 1, and b is a cross-section taken along line B-B excluding the intersection. It is a diagram. FIG. 3 is a partial cross-sectional view of a conventional reinforced rubber hose.
is a sectional view of a portion including the same intersection as in FIG. 2a, and b is a sectional view of a portion not including the same intersection as in FIG. 2b. 1... Mandrel, 2... Inner rubber layer, 3...
Reinforcement layer, 3a...Inner reinforcement layer, 3b...Outer reinforcement layer, 4...Outer rubber layer, 5...Coating layer, 6...Reinforcement material, 7...Bulging convex portion.

Claims (1)

[Scope of utility model registration request] Two reinforcing materials are placed on the inner rubber layer and the outer periphery of the inner rubber layer.
An inner reinforcing layer that is aligned and wound in a spiral,
The method includes an outer reinforcing layer in which two reinforcing materials are aligned around the outer periphery of the inner reinforcing layer and wound spirally so as to intersect with the reinforcing material in the inner reinforcing layer, and an outer rubber layer formed on the outer periphery of the outer reinforcing layer, A reinforced rubber hose having a bulging convex portion in which an inner rubber layer bulges into an outer rubber layer through an opening between cross reinforcing members of an inner reinforcing layer and an outer reinforcing layer.