JPH06129586A - Hose structure with check valve - Google Patents

Abstract

PURPOSE:To provide a hose structure which is embodied light and small and which has a check valve in a single piece structure without use of any clip. CONSTITUTION:A hose structure fitted with check valve is composed of a resin pipe 1 having hose insertion parts 10, 11 and a branch cylinder 12, hose 2 connected with the hose insertion parts 10, 11, a check valve 3 coupled with the branch cylinder 12, and a covering part 4 which is formed through die molding from a high-polymer material, which covers from outside at least the connection part of the hose insertion parts 10, 11 and the hose 2 with each other and the coupling part of the branch cylinder 12 and check valve 3 with each other, and which fixes them rigidly in a single piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose structure in which a check valve is integrally held.

[0002]

2. Description of the Related Art For example, a fuel hose connected to a canister is provided with a check valve that communicates with the outside of the hose in order to prevent negative pressure inside the canister including the inside of the hose. It is being provided. Conventionally, three hoses were connected and fixed by clips etc. to a metal branch pipe branched in three directions,
Two of them were used as a flow path, and a check valve was inserted into the remaining one hose and fixed with a clip or the like.

In recent years, a structure as shown in FIG. 3 has also been proposed for the purpose of eliminating clips and reducing weight. This hose structure has a resin-made branch pipe 10 branched in three directions.
0, a check valve 300 is inserted into a valve hose 200 connected to one of the branch pipes, and is fixed with a clip 301 or the like. In addition, a hose 400 is connected to each of the remaining two branch pipes,
Ends of three hoses 200 and 400 and branch pipe 10
No. 0 is integrally fastened and fixed by a resin coating portion 500 formed by injection molding.

[0004]

However, even in the hose structure shown in FIG. 3, a fixing tool such as a clip 301 is still necessary for fixing the valve hose 200 and the check valve 300, and the number of parts and the number of assembling steps are reduced. Further reduction is an issue. Further, the distance from the branch portion to the check valve requires the length of the valve hose 200, which is disadvantageous in terms of space.

Further, since the mounting density in the engine room has been increasing in recent years, it has been an object to reduce the size of each component and to eliminate the protrusions such as clips. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hose structure that has a check valve integrally without using a clip and has a reduced size and weight.

[0006]

SUMMARY OF THE INVENTION A hose structure with a check valve according to the present invention for solving the above-mentioned problems is a resin pipe having a hose insertion portion and a branch cylinder portion, and a hose connected to the hose insertion portion of the pipe. And a check valve connected to the branch cylinder, and at least a connecting portion between the hose insertion portion and the hose and a connection portion between the branch cylinder and the check valve, which are formed by molding from a polymer material, are externally covered and integrally formed. It is characterized by comprising a covering portion to be fixed.

[0007]

In the hose structure with a check valve for a hose of the present invention, the check valve is directly connected to the branch cylinder of the pipe and is integrally held and fixed to the pipe by the covering portion.
Therefore, the clip is not required and the conventional valve hose is not required, so that the overall size is reduced.

[0008]

EXAMPLES The present invention will be specifically described below with reference to examples. (Embodiment 1) FIG. 1 shows a hose structure with a check valve according to an embodiment of the present invention. This hose structure has a branch pipe 1 made of fiber reinforced nylon, two rubber hoses 2,
Check valve 3 and sheath 4 made of fiber reinforced nylon
It consists of and.

The branch pipe 1 includes a pair of hose insertion portions 10 and 11 which are respectively inserted into the hose 2, and a branch cylindrical portion 12.
It consists of and. A plurality of ring-shaped protrusions 13 for preventing the hose from coming off are formed on the outer peripheral surfaces of the hose insertion portions 10 and 11, respectively. A flange portion 14 is formed at the tip of the branch tube portion 12. The hose 2 is inserted into the hose insertion portions 10 and 11, respectively, and is sandwiched and fixed between the hose insertion portions 10 and 11 and the covering portion 4.

The check valve 3 comprises a pressure regulating chamber 30, and a first tubular portion 31 and a second tubular portion 32 extending 180 degrees in opposite directions from the pressure regulating chamber 30, respectively. The first tubular portion 31 becomes a large-diameter portion 33 having an enlarged diameter at the opening end and is engaged with the branch tubular portion 12. That is, the flange portion 14 of the branch tube portion 12 contacts the bottom portion of the large diameter portion 33, and the large diameter portion 3
An elastic seal ring 5 is interposed and sealed between the inner peripheral surface of 3 and the outer peripheral surface of the branched cylindrical portion 12. On the other hand, the second tubular portion 3
2 is open to the atmosphere.

The check valve 3 operates only when the pressure in the hose 2 becomes a negative pressure from the atmospheric pressure, and the hose 2 passes from the second tubular portion 32 via the pressure adjusting chamber 30 and the first tubular portion 31.
It is configured to supply atmosphere to the inside. The end portion of the hose 2 connected to the hose insertion portions 10 and 11 and the contact portion between the check valve 3 and the branch cylinder portion 12 are covered with the covering portion 4.
Are integrally fastened.

Here, the covering part 4 includes the entire branch pipe 1,
The connection part between the hose insertion parts 10 and 11 and the hose 2 and the connection part between the check valve 3 and the branch tube part 12 are arranged in a mold and formed by injection molding. Therefore, the hose 2 and the check valve 3 are firmly fastened by the injection pressure during molding and the contraction during cooling. The hose structure is
It was manufactured as follows. First, the branch pipe 1 is formed by injection molding, and the hose 2 is inserted into the hose insertion portions 10 and 11, respectively. The insertion depth is a position where the end surface of the hose 2 is in contact with the thick portion in the center of the branch pipe 1. On the other hand, the branch cylinder 12 is engaged with the first cylinder 31 of the check valve 3 and the seal ring 5 is interposed.

Next, the branch pipe 1 having the hose 2 and the check valve 3 is arranged in the split mold, and the covering portion 4 is integrally formed by injection molding. The molten resin filled in the cavity is injected into the hose 2 and the seal ring 5 by the injection pressure.
Is cooled and solidified while being compressed, and the end of the hose 2 is covered with the hose insertion portions 10 and 11 by the covering portion 4 along with shrinkage due to cooling.
It is strongly pressed against the surface and firmly fastened. Further, the seal ring 5 is compressed and comes into pressure contact with the branch cylindrical portion 12 and the large diameter portion 33, and seals between the branch pipe 1 and the check valve 3.

That is, according to the hose structure having the check valve of this embodiment, since the hose 2 is firmly sandwiched between the covering portion 4 and the hose inserting portions 10 and 11, no clip or the like is required. In addition, the check valve 3 also has a covering portion 4.
Since it is fixed at, the distance from the bifurcation is short and no clip or the like is required. Therefore, according to this hose structure, the hose structure is smaller than the conventional one and the check valve 3 is assembled, so that the number of assembling steps is reduced and the degree of freedom in space is improved. (Embodiment 2) FIG. 2 shows a hose structure according to a second embodiment of the present invention. In this embodiment, the branch tube portion 12 of the branch pipe 1
Is the same as the first embodiment except that the connecting means for connecting the check valve 3 to the first tubular portion 31 is different.

At the tip of the branch tube portion 12, the hose insertion portion 1
A ring-shaped protrusion 13 is formed as in the case of 0 and 11. Further, a flared expanded portion 34 is provided at the tip of the first tubular portion 31.
The outer diameter is the same as that of the branch tubular portion 12, and the end surface of the branch tubular portion 12 and the end surface of the first tubular portion 31 are in contact with each other. Then, the rubber tube 6 is inserted through the outer peripheral portions of the branch tubular portion 12 and the first tubular portion 31, and the covering portion 4 crosses the contact portion between the branch tubular portion 12 and the first tubular portion 31 from the branch tubular portion 12. 1st tube part 3
The tube 6 is compressed radially inward from the outer circumference. That is, the covering portion 4 fastens the check valve 3 via the tube 6. Therefore the first
The tubular portion 31 is pressed against the tube 6 and the expanded diameter portion 3
The presence of 4 prevents it from coming off the tube 6. Further, the tube 6 is also prevented from coming off from the branch cylindrical portion 12 due to the presence of the protrusion 13 and the fastening force of the covering portion 4. Further, the tube 6 includes the branch cylinder portion 12 and the first cylinder portion 31.
Since it is pressed against the contact portion, it is possible to seal the contact portion without using the seal ring 5 or the like.

That is, according to this embodiment, the branch pipe 1 which has been conventionally used can be used as it is, and the cost for manufacturing a die can be reduced. In the second embodiment, the end portion of the first tubular portion 31 of the check valve 3 is flared, and the rubber tube 6 is provided between the check valve 3 and the covering portion 4.
However, if the diameter of the first tubular portion 31 is the same as the diameter of the branched tubular portion 12, the conventional check valve 3 can be used as it is. Also in this case, a sufficient fastening force can be obtained by the injection pressure at the time of molding the covering portion 4 and the contraction at the time of cooling.

[0017]

According to the hose structure with a check valve of the present invention, the hose structure with a check valve can be downsized as compared with the conventional structure, which is advantageous in terms of arrangement space and can be easily attached to an attached portion. Moreover, since the entire assembly can be assembled, the number of assembling steps can be significantly reduced. Further, since there is no protrusion such as a clip, it is possible to prevent interference with other parts in the engine room or the like.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a hose structure according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional hose structure.

[Explanation of symbols]

1: Branch pipe 2: Hose 3: Check valve 4: Cover part 5: Seal ring 6: Tube 10, 11: Hose insertion part 12:
Branch tube

Claims (1)

[Claims] 1. A resin pipe having a hose insertion portion and a branch cylinder portion, a hose connected to the hose insertion portion of the pipe, a check valve connected to the branch cylinder portion, and a polymer material. And a covering portion that is formed by molding from at least the hose inserting portion, the connecting portion of the hose, and the connecting portion of the branch cylinder portion and the check valve from the outside and integrally fixed. Check valve hose structure.