JPH0783369A - Hose connecting structure and pipe fitting used therein - Google Patents

Abstract

PURPOSE:To provide a hose connecting structure and a pipe fitting used therein excellent in reliability relating to a leak by preventing a hose end part and a rubber layer from easily separating. CONSTITUTION:In a hose connecting structure for connecting a plurality of hoses 2, 3 through a pipe fitting 10, annular protrusions 11, 12 for press spreading an engaged hose internal peripheral surface to the outside are protrusively provided in each hose connecting engaging part 10a, 10b of the pipe fitting 10, and by these annular protrusions 11, 12, a clearance is formed by floating engaging edge parts of the hoses 2, 3 from the periphery of a main unit of the pipe fitting 10, to coat the hoses 2, 3 containing this clearance part and a connecting part total unit of the pipe fitting 10 with a rubber layer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connecting structure for connecting a plurality of hoses via a pipe joint and a pipe joint used for the structure.

[0002]

2. Description of the Related Art Conventionally, when a fluid is diverted from a main hose to a sub hose, a collar 1a engaging with the main hose and a cylindrical portion 1b engaging with the sub hose are provided as shown in FIG. 5 (a). The main hose and the sub hose are connected using the pipe joint 1 described above. That is, as shown in FIG. 2B, a hole 4 is opened in advance in the main hose 2, the collar 1a of the pipe joint 1 is inserted into the hole 4, and only the cylindrical portion 1b is provided outside the hole 4. To make it stick out. Then, after the sub-hose 3 is externally fitted to the cylindrical portion 1b, the connecting portion is arranged in a predetermined mold and the mold is closed. 2 and the auxiliary hose 3 can be integrated via the pipe joint 1. Reference numeral 5 denotes a vulcanized rubber layer, and reference numeral 6 denotes a plurality of steps provided to prevent the auxiliary hose 2 from coming off easily.

When a plurality of, for example, three hoses are connected instead of connecting the main hose 2 and the sub-hose 3 as described above, the same one as the cylindrical portion 1b projects in three directions. A T-shaped pipe joint is used as a whole.
FIG. 6 shows a state in which three hoses 8 are connected using this pipe joint 7 and covered with the rubber layer 5.

Further, when the hose 8 is simply extended instead of branching the hose passage, the cylindrical portion 1b is used.
The same as the above-mentioned one projects to the left and right, and one tubular pipe joint is used as a whole. FIG. 7 shows a state where two hoses 8 are connected using this pipe joint 9 and covered with the rubber layer 5.

[0005]

However, in these hose connection structures, since the unvulcanized rubber is coated around the already vulcanized hoses 2, 3, 8 and vulcanized and molded, the hoses 2, 3 are not formed. The adhesive force between the surfaces of the molded rubber layers 8 and 8 and the molded rubber layer 5 is lower than the bonding force between the unvulcanized rubbers. Therefore, when the hoses 2, 3 and 8 are bent or vibrated and a twisting stress or a tensile stress is applied to the edge of the hose opening, the rubber layer 5 that covers the connecting portion is changed to the hose 2, 3 or 8.
8 is easily peeled off from the open end, and there is a problem that reliability against leakage is lacking.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a hose connection structure which is difficult to separate the hose end portion and the rubber layer from each other and has excellent reliability against leakage, and a pipe joint used therefor. And

[0007]

In order to achieve the above object, the present invention provides a hose connecting structure for connecting a plurality of hoses through a pipe joint, and each hose connecting engaging portion of the pipe joint. An annular projection is provided on the projection for pushing the inner peripheral surface of the engaged hose outward, and the engagement edge of the hose is lifted from the outer periphery of the pipe joint body by the annular projection to form a gap. The first gist is a hose connection structure in which the entire connection part between the hose and the pipe joint including the part is covered with a rubber layer, and a plurality of hose connection engagement parts are provided, and each engagement part is associated with this part. An annular projection is provided to project the inner peripheral surface of the compatible hose to the outside, and the annular projection allows the engaging edge of the hose to float above the outer periphery of the pipe joint body to form a gap. The second gist of the present invention is a pipe joint.

[0008]

That is, according to the present invention, as a pipe joint for connecting a hose, a special pipe joint having a function of pushing the inner peripheral surface of the hose outward is used, and the engaging edge portion of the hose is connected to the outer periphery of the pipe joint body. The rubber layer is made to float so as to form a gap, and the rubber layer also enters this gap so that the rubber layer also enters the inner surface of the hose. Therefore, the rubber layer seems to be caught in the engaging edge portion of the hose, and the hose engaging edge portion and the rubber coating layer are not separated even when the hose is subjected to twisting stress or tensile stress. Further, since the adhesive area of the rubber layer is larger than that of the conventional one, the adhesive force of the rubber layer is also improved. This makes it possible to maintain high reliability against leakage even when the internal pressure of the fluid is high, or when the hose vibrates or moves frequently.

Next, the present invention will be described in detail based on examples.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and FIG. 2 (AA 'sectional view of FIG. 1)
Shows an embodiment of the present invention. This hose connection structure is used when a sub-hose 3 is connected to the main hose 2 to form a branch path, and like the conventional structure shown in FIG. The collar 10a of the pipe joint 10 is inserted into the hole 4, the sub-hose 3 is externally fitted to the cylindrical portion 10b protruding outward from the hole 4, and the periphery of the connecting portion is vulcanized and molded. It has a structure covered with a rubber layer 5.

The pipe joint 10 has a collar 10a and a cylindrical portion 10b as in the conventional one, but the collar 1
An annular protrusion 11 that stands up vertically is formed on the peripheral portion of the surface of the 0a that is engaged with the hole 4 of the main hose 2.
Further, from the substantially central portion of the cylindrical portion 10b toward the root side,
The outer peripheral surface is gradually enlarged to a large diameter to form a tapered annular projection 12. Therefore, the pipe joint 1
0, the inner peripheral surfaces of the main hose 2 and the sub-hose 3 at the engaging portions of the main hose 2 and the sub-hose 3 are expanded outward by the annular projections 11 and 12, respectively. The engaging edges of the hoses 2 and 3 float up from the outer circumference of the main body of the pipe joint 10 to form a gap.
The rubber layer 5 has entered.

According to the above structure, the rubber layer 5 has the hose 2,
Since the engagement state is such that the engagement edge portion of No. 3 is bitten in, the hose engagement edge portion may be separated from the rubber layer 5 even if the hose 2, 3 is subjected to twisting stress or tensile stress. It is possible to maintain high reliability against leakage.

In the present invention, the main hose 2 and the auxiliary hose 3 are used.
The present invention is not limited to the case of connecting to and, but can be applied to the case of connecting a plurality of, for example, three hoses. in this case,
As shown in FIG. 3, a hose engaging cylindrical portion 10b projects in three directions, and a T-shaped pipe joint 10 'is used as a whole. In this pipe joint 10 ', a tapered annular projection 12 is formed on each cylindrical portion 10b, as in the above embodiment,
The fitting edge of each hose 8 fitted onto this portion is connected to the pipe joint 1
The rubber coating layer 5 can be made to float up from the outer periphery of the main body of 0'and reach the inner peripheral surface side of the hose 8. As a result, the hose connection structure of FIG. 3 can maintain high reliability against leakage, as in the above embodiment.

The present invention can also be applied to the case where the hose 8 is simply extended. In this case, as shown in FIG. 4, the cylindrical portion 10b for hose engagement projects to the left and right, and a single tubular pipe joint 10 ″ is used as a whole.
Also in this pipe joint 10 ″, the left and right cylindrical portions 10b are
Similar to the above embodiment, the tapered annular projection 12 is formed, and the same effect as the above can be obtained.

Furthermore, the pipe joints 10 and 1 used in the present invention
The materials of 0 ′ and 10 ″ may be the same as those of the conventional pipe joint, and any kind of unvulcanized rubber used to form the rubber layer 5 may be used. The material of the hoses 2, 3, 8 may be rubber, nylon, or any other material.

[0016]

As described above, according to the present invention, in the hose connection structure, since the special pipe joint having the function of pushing the inner peripheral surface of the hose outward is used, the engaging edge portion of the hose is connected to the pipe. Floating from the outer periphery of the joint body, a gap is formed,
The rubber layer also enters this gap and enters the inner peripheral surface of the hose. Therefore, the rubber coating layer seems to be caught in the engaging edge portion of the hose, and the hose engaging edge portion and the rubber coating layer are not separated even when twisting stress or tensile stress is applied to the hose. Further, the adhesion area of the rubber layer is also increased as compared with the conventional case, so that the adhesion force of the rubber layer is improved. This makes it possible to maintain high reliability against leakage even when the internal pressure of the fluid is high, or when the hose vibrates or moves frequently.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

FIG. 3 is a vertical sectional view of another embodiment of the present invention.

FIG. 4 is a vertical sectional view of still another embodiment of the present invention.

FIG. 5A is a front view showing an example of a pipe joint used in a conventional hose connection structure, and FIG. 5B is a longitudinal sectional view showing a conventional hose connection structure using the pipe joint.

FIG. 6 is a vertical cross-sectional view showing another conventional hose connection structure.

FIG. 7 is a vertical sectional view showing still another conventional hose connection structure.

[Explanation of symbols]

 2 Main hose 3 Sub hose 5 Rubber layer 8 Hose 10, 10 ', 10 "Pipe joint 11, 12 Annular protrusion

Claims (2)

[Claims] 1. A hose connection structure for connecting a plurality of hoses via a pipe joint, wherein the hose inner peripheral surface engaged with each hose connection engaging portion of the pipe joint is expanded outward. An annular protrusion is provided so that the engagement edge of the hose floats up from the outer periphery of the pipe joint body to form a gap, and the entire connection between the hose and the pipe joint including this gap is covered with a rubber layer. Hose connection structure characterized by being 2. A plurality of hose connecting engaging portions, each of which is provided with an annular protrusion projecting outwardly to expand an inner peripheral surface of the hose capable of engaging with this portion. The fitting edge of the hose floats up from the outer periphery of the fitting body to form a gap.