JPH0560279A - Connecting structure of hose - Google Patents

Abstract

PURPOSE:To further improve the fastening strength of a hose by forming a space between the hose top end surface and the thick part of a pipe member, and charging the space with a resin cover material. CONSTITUTION:A pipe member 2 is formed of a cylinder part 20 having a plurality of ring projections for stopping on the surface and a thick part 22 in the center. The thick part 22 is radially protruded from the cylinder part 20 in a thickness corresponding to the thickness of a hose 1, and its boundary part with the cylinder part 20 forms a tapered surface. The hoses 1 are inserted to the cylinder part 20 from both sides and the hose top ends are brought into contact with the tapered surface of the thick part. The pipe member 2 to which the hoses 1 are inserted is put in a molding die, and a resin cover part 3 is formed by injection molding. The fused resin is charged in the space between the end surfaces of the hoses 1 and the tapered surface of the thick part 22 to form filling parts 30. The hose 1 end parts are laid in the compressed state between the ring projections and the filling parts 30 to improve stopping force and seal air-tightness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bidirectional branch hose, 3
The present invention relates to a hose connection structure used for a branch portion such as a directional branch hose.

[0002]

2. Description of the Related Art Conventionally, as a hose connection structure, for example, one disclosed in Japanese Patent Laid-Open No. 62-233591 is known. As shown in FIG. 4, this connection structure includes branch pipes 100 that branch in three directions, and hoses 201 and 202 inserted into the branch pipes of the branch pipes 100.
203, and a resin coating portion 300 that covers the joint between the hose and the branch pipe.

In order to form this hose connection structure, the branch pipes of the branch pipe 100 are respectively connected to the hoses 201 to 203.
To insert. Then each hose and branch pipe 10
The joint portion of 0 is arranged in the mold, and the resin covering portion 300 is formed on the joint portion by molding. At this time, since the resin coating portion 300 contracts and solidifies at a contraction rate of 0.5% or more, a diameter reducing force acts on each hose. As a result, each hose is strongly sandwiched between the resin coating portion 300 and the branch pipe 100, and a high sealing pressure is obtained.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to further improve the fastening strength of a hose in the above hose connection structure.

[0005]

A hose connection structure of the present invention which solves the above-mentioned problems includes a hose, a cylindrical portion having an annular projection for preventing the stopper from being inserted into the hose, and an opening of the cylindrical portion. A hose consisting of a pipe member formed at the rear for positioning the insertion of the hose, and a resin covering part formed by molding over the entire circumference of the connecting part of the hose and the pipe member. In the connection structure, a gap is formed between the thick wall portion and the hose end surface, and the resin coating portion fills the gap.

The hose connection structure of the present invention comprises a pipe member, a hose, and a resin coating portion. As the hose, various hoses can be used as in the conventional case. Above all, it is preferable to use a reinforcing hose in which a reinforcing yarn layer is braided in the middle. The pipe member is composed of a plurality of tubular portions and a thick portion provided between the plurality of tubular portions. On the surface of the cylinder,
An annular protrusion for retaining is formed as in the conventional case.
The thick-walled portion is formed in the rear portion from the opening of the tubular portion, and has a function mainly as a positioning for inserting the hose.

The resin coating portion is the same as the conventional one, which is formed by molding over the entire circumference of the connecting portion between the hose and the pipe member. The greatest feature of the present invention is that a gap is formed between the thick wall portion and the hose tip surface, and the resin coating portion fills the gap. With such a configuration, a force that is pressed toward the annular projection on the surface of the tubular portion of the pipe member acts on the end of the hose due to the injection pressure during molding and the pressure during contraction of the resin coating portion. .. As a result, the retaining property and the seal airtightness can be further improved. The gap may be partially formed in the circumferential direction of the pipe member, or may be formed in a ring shape that makes one round.

Further, when a reinforcing hose is used as the hose, a reinforcing thread layer is exposed on the end face, and it is expected that the molten resin is impregnated into the reinforcing thread layer during molding of the resin coating portion. As a result, the exposed portion of the reinforcing yarn layer and the resin coating portion are integrally coupled, and the reinforcing yarn layer is prevented from falling off the end surface due to pulsation of the hose during use. Therefore, the reinforcing thread layer is surely present in the fastening portion, and it is possible to prevent the hose strength from being lowered due to the lack of the reinforcing thread layer.

[0009]

In the hose connection structure of the present invention, a gap is formed between the hose tip surface and the thick wall portion,
The resin coating portion fills the gap. Therefore, on the end surface of the hose, a resultant force of forces from the resin coating portion inward in the substantially axial direction and in the radial direction acts, and the resultant force acts in a direction toward the annular projection provided on the surface of the tubular portion. As a result, the end portion of the hose is sandwiched between the resin coating portion and the annular protrusion, and the retaining performance can be further improved. Further, since the end portion of the hose is compressed and deformed by the resultant force, an elastic reaction force is generated at the end portion, and the sealing property is improved. Further, it is expected that the reinforcing yarn layer will be impregnated with the resin, so that the reinforcing yarn can be prevented from coming off.

Due to these functions, the hose connection structure of the present invention can improve the hose retention performance and durability as compared with the conventional connection structure.

[0011]

Embodiments will be specifically described below with reference to embodiments. (Embodiment 1) FIG. 1 is a sectional view of a connection structure according to an embodiment of the present invention. This connection structure includes two hoses 1 and a pipe member 2 inserted into each hose 1 and branched in two directions.
And a resin covering portion 3 covering the entire circumference of the connecting portion between the hose 1 and the pipe member 2.

As shown in the enlarged view of FIG. 2, the hose 1 comprises an inner tube rubber layer 10, an outer rubber layer 11, and a reinforcing thread layer 12 interposed between the inner tube rubber layer 10 and the outer rubber layer 11. It is a reinforcing hose. First of all, this hose 1 has an inner tube rubber layer 10
Is extruded, and a reinforcing yarn is braided on the surface thereof to form a reinforcing yarn layer 1
Form 2. Further, the outer rubber layer 11 is further formed on the surface thereof.
Is extruded and integrally vulcanized.

The pipe member 2 is composed of a tubular portion 20 that extends to the left and right sides and has a plurality of annular projections 21 on its surface for preventing slipping off, and a thick portion 22 formed between the tubular portions 20 on both sides. To be done. The annular projection 21 has a tapered surface whose diameter gradually increases from the opening side of the tubular portion 20 toward the thick wall portion 22 side, and has a ring-shaped wall portion 21a at the rear end that forms a plane perpendicular to the axial direction. With. Further, the thick portion 22 has a thickness substantially corresponding to the thickness of the hose 1 and projects radially from the tubular portion 20, and the boundary portion with the tubular portion 20 is a tapered surface 22a whose diameter increases toward the central portion. There is.

The resin coating portion 3 is provided at a position to cover almost the entire pipe member 2, and a cross section for filling a gap portion formed between the tapered surface 22a of the thick portion 22 and the tip end surface of the hose 1. It has a triangular ring-shaped filling portion 30. In order to form this connection structure, first, the two tubular portions 20 extending in the left and right directions are inserted into the hose 1, respectively. At this time, a part of the end surface of the hose 1 has a tapered surface 22a of the thick portion 22.
The position of insertion is determined by contacting with. And hose 1
The pipe member 2 in which is attached is placed in a molding die, and the resin coating portion 3 is formed by injection molding. At this time, the molten resin is also filled in the ring-shaped gap formed between the end surface of the hose 1 and the tapered surface 22a of the thick portion 22, and the filled portion 3
0 is formed.

According to the connection structure of this embodiment, the filling portion 30
At the position where is present, a force for pressing the end surface of the hose 1 acts due to the resin pressure and the contraction pressure at the time of molding, and a force for pressing toward the wall portion 21a of the annular projection 21 acts on the end portion of the hose 1. To do. Therefore, the end of the hose 1 is
1 and the filling portion 30 are in a compressed state, and a compressive deformation also occurs and the reaction force improves the retaining force and the seal airtightness.

Further, the filling portion 30 is partially impregnated into the reinforcing yarn layer 12 and hardened integrally, so that the reinforcing yarn layer 12 is prevented from falling out. This improves durability. (Embodiment 2) FIG. 3 shows a hose connection structure according to a second embodiment of the present invention. This embodiment is the same as Embodiment 1 except that the pipe member 2 is a branch pipe that branches in three directions, and the thick portion 22 of the tubular portion 20 and the hose 1 that branch in three directions.
And a ring-shaped filling portion 30 are formed between them and. Also in the connection structure of the present embodiment, the same operational effects as those of the connection structure of Embodiment 1 can be obtained, and the effect of improving the retaining strength and the durability can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a hose connection structure according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of a hose connection structure according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional hose connection structure.

[Explanation of symbols]

1: Hose 2: Pipe member
3: Resin coating part 21: Cylindrical part 21: Annular protrusion
22: Thick part 12: Reinforcing yarn layer 30: Filling part

Claims (1)

[Claims] 1. A hose, a tubular portion having a ring-shaped projection for retaining the surface of the hose and inserted into the hose, and a thick portion formed rearward from the opening of the tubular portion for positioning the insertion of the hose. In the connection structure of the hose, which comprises a pipe member made of, and a hose and a resin-made coating part which is formed on the entire connection part of the pipe member by molding and is formed, the thick part and the hose tip surface. A gap is formed between
A connection structure for a hose, wherein the resin coating portion fills the gap.