JPH0624636Y2 - Hose connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a hose connection structure used when connecting a hose by branching it in three or more directions.

[Prior Art] When a hose is branched and connected, for example, JP-A-62-1
The structures disclosed in the publications such as 233591 and JP-A-62-233592 are known. As shown in FIG. 6, this connecting structure has a coupling pipe 100 that branches in three directions.
And the hoses 201, 202, 203, and the resin coating portion 3
00 and the like. To form this hose connection structure, the coupling pipe 100 is connected to the hoses 201, 202, 20.
Insert in 3 respectively. After that, the connecting portion between the hose and the connecting pipe 100 is placed in a molding die, and the resin coating portion 300 is molded with a fiber reinforced polyamide resin or the like. At this time, since the resin coating portion 300 contracts and solidifies at a contraction rate of 1% or more, the diameter reducing force acts on the surface of each hose. As a result, each hose has a resin coating 30
It is strongly clamped between 0 and the coupling pipe 100, and a high sealing pressure is obtained.

[Problems to be Solved by the Invention] In the above-described conventional hose connection structure, the volume of the branch pipe may be relatively large, and the number of portions protruding into the flow path may be large, resulting in a large resistance to fluid flow. It was In addition, since the branch structure is complicated, the structure of the mold becomes complicated, and the cost required for the mold also becomes inconvenient. There is also a problem that the weight is further increased.

The present invention has been made in view of such circumstances,
The purpose is to provide a connection structure with a simpler configuration.

[Means for Solving the Problems] The hose connection structure of the present invention is a plate-like structure having a main hose having a branch hole communicating with the center hole on the peripheral surface and a curved contact surface along the inner peripheral surface of the main hose. Of the abutment seat and a branch pipe having a central hole projecting from the abutment surface of the abutment seat and a ring-shaped groove formed on the outer peripheral surface of the root of the branch pipe, and inserted into the main hose. A core member in which the abutment seat is pressed against the inner surface of the main hose, the auxiliary hose inserted into the outer circumference of the branch pipe protruding from the branch hole, and the connecting portion of the main hose and the sub hose. A resin coating portion that is disposed in the mold and formed by molding to cover the joint portion and also fills the groove portion and is integrally joined to the core member;
The core member and the resin coating part sandwich the main hose and the sub-hose, respectively.

In the conventional connection structure described above, three hoses were used, but in the present invention, the auxiliary hose is branched from the branch hole of the main hose. The most important feature of the present invention is the configuration of the core member inserted in the main hose and the sub hose.

The core member includes an abutment seat and a branch pipe. The abutment seat has a shape along the inner peripheral surface of the branch hole portion of the main hose. A branch pipe is provided so as to project from the contact surface of the contact seat, which contacts the inner peripheral surface of the main hose. It is desirable that the contact seat be provided with a ring-shaped ridge protruding outside the branch pipe toward the inner peripheral surface of the main hose. In this way, the ridge portion bites into the inner peripheral surface of the main hose, and the sealability can be secured at that portion. This core member can usually be manufactured from a resin such as a polyamide resin.

A branch pipe projects from a core member placed in the main hose into a branch hole, and a sub hose is inserted and connected to the branch pipe. A resin coating portion is formed on the connecting portion. Here, the resin coating portion is integrally connected to the core member. In order to do so, the diameter of the branch hole may be made larger than the outer diameter of the branch pipe so that the contact seat is exposed in the cavity when the covering portion is molded. Further, the insertion allowance of the auxiliary hose inserted into and coupled to the branch pipe may be shortened to expose the outer peripheral surface of the branch pipe. This allows the molten resin to come into contact with the core member during molding of the covering portion, and the core member and the covering portion can be integrally joined by welding. Further, it is desirable that a groove or the like is provided in the core member at the contact portion and the covering portion is filled in the groove to lock the core member. Further, it is also preferable that the surface of the core member in the contact portion is roughened so as to increase the contact area with the covering portion.

In order to form the hose connection structure of the present invention, first, the core member is arranged in the main hose, and the branch pipe is projected from the branch hole.
In this case, the branch hole may be made larger and the abutment seat of the core member may be inserted into the main hose through the branch hole. The entire core member may be inserted into the central hole from the end surface of the hose so that the branch pipe projects from the branch hole. Then, the auxiliary hose is inserted and connected to the branch pipe protruding from the branch hole.

In this case, the contact seat needs to be pressed against the inner peripheral surface of the main hose near the branch hole. To do this, the main hose may be pressed from the outer surface of the main hose on the side opposite to the branch hole, and the abutment seat may be pressed on the inner peripheral surface of the main hose on the side opposite to the branch hole. The tool can be inserted into the main hose to keep the contact seat pressed against the inner peripheral surface of the main hose in the vicinity of the branch hole.

Then, while maintaining the state in which the contact seat is pressed against the inner peripheral surface of the main hose in the vicinity of the branch hole, the joint portion is arranged in the mold and the covering portion is formed on the joint portion by molding. As a result, the covering portion and the core member are integrally joined by welding or the like.

[Operation and Effect of the Invention] In the hose connection structure of the present invention, the core member is composed of one branch pipe and the abutment seat along the inner peripheral surface of the hose, and has an extremely compact structure.

Therefore, the portion protruding into the main hose can be made smaller than in the conventional case, and the resistance of the fluid can be prevented. Further, the weight can be reduced. Further, the cost required for the mold for forming the core member is reduced, and the overall cost can be reduced.

[Examples] Specific examples will be described below.

(Embodiment 1) FIG. 1 shows a hose connection structure according to an embodiment of the present invention. This connection structure includes a main hose 1, a core member 2, and a sub hose 3.
And a resin coating portion 4.

The main hose 1 has a branch hole 11 on the peripheral surface that communicates with the central hole 10.

As shown in the perspective view of FIG. 2, the core member 2 has an abutment seat 2 having a shape in which a disc is curved along the inner peripheral surface of the main hose 1.
0 and a branch pipe 21 protruding from the convex contact surface 20a of the contact seat 20. Contact surface 20a of contact seat 20
On the outer side of the branch pipe 21, there are formed two ring-shaped projecting ridges 22 extending concentrically. Further, the outer peripheral surface of the branch pipe 21 has a collar portion 23 in the vicinity of the contact seat 20, and the collar portion 23
A plurality of ring-shaped protrusions 24 having a saw-toothed cross section are coaxially formed on the front end side. A ring-shaped groove 25 is formed between the collar 23 and the contact seat 20. Further, as shown in FIG. 3, a rough surface 26 is formed on the surfaces of the collar portion 23 and the groove portion 25.

In the hose connection structure of this embodiment, the abutment seat 20 is arranged in the center hole 10 of the main hose 1, and the branch pipe 21 is arranged in the branch hole 11.
A ring-shaped protruding portion 22 protruding further extends into the inner peripheral surface of the main hose 1. The auxiliary hose 3 is inserted and coupled to the branch pipe 21 that projects at a right angle to the axial direction of the main hose 1. The inner diameter of the branch hole 11 is larger than the outer diameter of the branch pipe 21, and a ring-shaped gap is formed between the branch hole 11 and the branch pipe 21.

The covering portion 4 fills the gap between the branch pipe 21 and the branch hole 11 to cover the surface of the main hose 1 at the peripheral portion of the branch hole 11, and further extends along the branch pipe 21 to cover the end of the auxiliary hose 3. is doing. Therefore, the collar portion 23 acts as a stopper for the covering member 4 with which the groove portion 25 is filled, and the relative movement between the covering portion 4 and the branch pipe 21 in the axial direction of the branch pipe 21 is prevented. Further, since the contact area is increased by the rough surface 26 formed on the core member 2, the connection is further strengthened. Further, the covering portion 4 and the core member 2 are made of the same kind of resin, and the heat of the molten resin at the time of forming the covering portion 4 melts a part of the surface of the core member 2 to weld the core member 2 and the covering portion 4 together. Good.

To form the connection structure of this embodiment, first, the contact seat 20 of the core member 2 is inserted into the main hose 1 through the branch hole 11. The inner diameter of the branch hole 11 is increased, and the contact seat 20 is press-fitted and arranged in the main hose 1. Next, the wall surface of the main hose 1 on the side opposite to the branch hole 11 in the radial direction is pressed from the outside toward the branch hole 11. Therefore, the abutment seat 20 is pressed by the wall surface of the main hose 1 against the inner peripheral surface of the main hose 1 in the vicinity of the branch hole 11, and the ridge portion 22 bites into the inner peripheral surface. The branch pipe 21 is inserted into the auxiliary hose 3 while maintaining this state. The sub-hose 3 is inserted into the collar 2
3 functions as a sputter, and the insertion is positioned at that position.

Then, while maintaining the state in which the contact seat 20 is pressed against the inner peripheral surface of the main hose 1, the coupling portion is arranged in the mold and the covering portion 4 is formed by injection molding. At this time, the molten resin is also filled in the gap between the branch hole 11 and the branch pipe 21, and the groove portion 2 of the branch pipe 21 is filled.
5 and the surface of the collar portion 23, and further the surface of the contact seat 20 in the vicinity of the branch pipe 21. As a result, the covering portion 4 and the core member 2 are locked by the portion filled in the groove portion 25.

After forming the covering portion 4, the pressure applied to the main hose 1 is released and the shape of the main hose 1 is restored by the elastic force to obtain the connection structure of this embodiment.

Therefore, according to the connection structure of the present embodiment, since the covering portion 4 and the core member 2 are integrally joined, the joint strength can be maintained high. In addition, since the projecting ridge portion 22 of the ring ridge digs into the inner peripheral surface of the main hose 1, high sealing performance is ensured. Further, the abutment seat 20 only partially exists in the main hose 1 in the circumferential direction and the axial direction, so that the resistance of the fluid is reduced as compared with the conventional case. And since the shape of the core member 2 is simple, the man-hour required for manufacturing is reduced,
Moreover, the weight can be reduced.

(Embodiment 2) FIGS. 4 and 5 show a hose connection structure according to a second embodiment of the present invention. In this connection structure, the outer diameter of the contact seat 20 is smaller than that of the first embodiment, the outer diameter of the resin coating portion 4 is larger than the outer diameter of the contact seat 20, and the peripheral edge portion 40 has the contact seat 20.
It is similar to the first embodiment except that it is bent so as to be close to the peripheral edge portion 27.

In the connection structure of this embodiment, the peripheral edge portion 40 of the resin coating portion 4 is
Since the main hose 1 is sandwiched between and the peripheral edge portion 27 of the contact seat 20, a higher sealing property is secured.

[Brief description of drawings]

1 to 3 relate to a hose connection structure of an embodiment of the present invention, FIG. 1 is a sectional view thereof, FIG. 2 is a perspective view of a core member,
FIG. 3 is an enlarged cross-sectional view of the main parts of FIG. 4 and 5 relate to the hose connecting structure of the second embodiment, FIG. 4 is a sectional view thereof, and FIG. 5 is a perspective view of a core member. FIG. 6 is a sectional view showing a conventional hose connection structure. DESCRIPTION OF SYMBOLS 1 ... Main hose, 2 ... Core member 3 ... Sub hose, 4 ... Resin coating part 10 ... Central hole, 11 ... Branch hole 20 ... Abutment seat, 21 ... Branch pipe 22 ... Ridge part, 23 ... Collar part 25 ... Grooves, 26 ... Rough surface

Claims (1)

[Scope of utility model registration request] 1. A main hose having a branch hole communicating with a central hole on its peripheral surface, a plate-shaped contact seat having a curved contact surface along the inner peripheral surface of the main hose, and a corresponding contact of the corresponding seat. A branch pipe projecting from the surface and having a central hole, and a ring-shaped groove formed on the outer peripheral surface of the root of the branch pipe, inserted into the main hose, and the branch pipe projecting from the branch hole to the outside A core member whose seat is pressed against the inner peripheral surface of the main hose, an auxiliary hose inserted and connected to the outer periphery of the branch pipe projecting from the branch hole, and a connecting portion of the main hose and the auxiliary hose in a mold. A resin-made covering portion that is formed by molding and covers the joint portion and fills the groove portion and is integrally joined to the core member. A hose connection characterized in that the main hose and the sub-hose are sandwiched respectively. Elephants.