JPH10231977A - Hose connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose connecting structure which has a very simple structure and can be provided at low cost, can secure uniform sealing effect by pressurizing uniformly a hose from the periphery at one end, and which does not allow ordinary user to remove easily once it is attached. SOLUTION: One end 10 of a hose 1 is fastened by a ring-shaped cylinder member 16 arranged at the periphery of the outer cylinder at the end 10 to the insert pipe part 20 of a fluid pipe 2 inserted to the end 10, wherein the cylinder member 16 has a circumferential wall having uniform wall thickness, and the circumferential wall stretches annularly on the same circle. This permits uniform contact of the hose end 10 with the cylinder member 16 in straight ring form, and as a result, fastening of the hose end 10 to the insert pipe part 20 by the cylinder member 16 can be made uniformly and strongly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connection structure in which an insertion pipe portion of a fluid pipe such as a pipe is connected to one end of a hose. More specifically, the present invention relates to a simple hose connection structure in which an insertion pipe portion of a fluid pipe used to transfer a fluid such as gasoline, oil, water, air, and the like in an automobile or the like is not easily detached from one end of a rubber hose. .

[0002]

2. Description of the Related Art Heretofore, as a simple hose connection structure of this kind, there has been known a clamp connection using a hose clamp. Conventionally, this type of hose clamp is roughly divided into a spring-type clamp having grip portions for expanding the diameter at both ends of a plate material formed in a ring shape so as to reduce the diameter of a flat spring material, and a substantially ring shape. There is a screw clamp in which both ends of the formed plate material are tightened with a screw portion to reduce the diameter. Regarding the sealing property of the hose connection structure that connects the insertion tube part and one end of the hose by these hose clamps,
The clamping force to the hose by the clamp and the adhesiveness of the joint surface between the outer periphery of the insertion tube and the inner periphery of the hose formed by the clamp are ensured. Each of the hose clamps has the advantage that the number of parts is small and the connecting operation is simple, so that the connecting structure is provided at low cost.

[0003] However, such a conventional hose connection structure,
The structure is such that the general user can easily remove the hose clamp by operating the gripping part or screw part.If the hose clamp is once removed, the hose will deteriorate during use even if the connection part is connected again. Due to the reduced elasticity, it is not expected to reproduce the initial sticking properties after retightening, and the sticking properties of the outer circumference of the insertion tube and the inner circumference of the hose are extremely weakened, and the initial sealing There is a problem that it becomes impossible to secure. Further, such a conventional hose connection structure cannot be tightened in a perfect circular shape, and there is a problem that the entire outer periphery of the hose cannot be uniformly tightened.

[0004] When a screw clamp is used, the hose is thermally degraded to cause sagging at the connection portion, and when the tightening force of the clamp is weakened, the sealing property of the connection portion is determined by attaching the hose to the pipe. Although it depends on the force, there is a problem that such a sticking force gradually decreases, and it is impossible to always maintain excellent sealing properties, and the reliability of the sealing properties is lacking.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and has a very simple structure, is inexpensive, and has a uniform sealing property by uniformly pressing the hose from one end of the hose. It is a first object of the present invention to provide a hose connection structure which can secure the hose connection and is difficult for a general user to remove once attached. Desirably, a second object is to provide an inexpensive hose connection structure that can always maintain excellent sealing performance by following the set at one end connection portion of the hose and that is difficult for a general user to remove once connected. .

[0006]

Means for Solving the Problems and Effects of the Invention
In order to achieve the object of (1), a structural feature of the invention according to claim 1 is that a metal or resin fluid pipe having an insertion pipe inserted into at least one end of a hose, On the other hand, the annular tubular member disposed on the outer periphery of the hose with one end of the hose fastened has a peripheral wall having a uniform thickness, and the peripheral wall extends annularly on the same circle.

In the first aspect of the present invention, as shown in FIG. 3, the thickness of the peripheral wall of the cylindrical member 16 is uniform, and the cylindrical member 16 has a straight annular shape. The contact between the one end 10 of the first tubular member 1 and the cylindrical member 16 is made uniform, and as a result, the cylindrical member 16
, The end 10 of the hose 1 can be uniformly and strongly tightened, and the pull-out resistance and the sealing property are improved, and a strong connection structure can be obtained despite an inexpensive and extremely simple structure. In particular, by providing a fixing layer mainly composed of rubber or resin on the inner peripheral surface of one end of the hose proposed by the present applicant in Japanese Patent Application No. 7-307027, the pull-out resistance and sealing property of the connection structure are further improved. Can be enhanced.

According to the first aspect of the present invention, the sealability and pull-out resistance of the connection portion can be enhanced to the same level as that of the conventional metal fitting type, and an inexpensive connection structure equivalent to the clamping can be obtained. In addition, since a straight annular tubular member is externally fitted to the hose, this connection structure gives an impression that it is difficult to disassemble one end of the hose and the insertion tube portion in appearance, so that the connection structure is removed by a general user. Can be prevented, and the reliability of the connection structure is maintained.

Further, the structural feature of the invention according to claim 2 is that the annular tubular member has spring elasticity, and the peripheral wall substantially crosses from one end in the axial direction to the other end, and is spaced apart from each other in the circumferential direction. The present invention has a pair of opposed ends which are provided with a clearance and are circumferentially opposed to each other, and a tightening force acts on the annular tubular member in a radially-reducing direction. In the invention according to claim 2 configured as described above, in addition to the effect of the invention of claim 1, due to the spring characteristic of the cylindrical member having a right circular ring shape, it follows the set at one end of the hose in use. Therefore, the pull-out resistance and the sealability of the connection structure can be ensured for a long period of time because the hose acts on the hose.

According to a third aspect of the present invention, the pair of opposed ends of the annular tubular member according to the second aspect are fitted in an uneven relationship in a circumferential direction. And the clearance is formed in an uneven shape from one end to the other end in the axial direction. In the invention according to claim 3 configured as described above, in addition to the effects of the invention according to claim 1 or 2, the clearance 32a is formed to have an uneven shape, so that the clearance according to claim 2 is formed. In comparison, since a pair of opposing end parts overlap in the circumferential direction,
Furthermore, it is possible to tighten the one end 10 of the hose uniformly over the entire circumference.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a main part of an embodiment of the present invention in a crushed cross section. Yes,
A straight annular tubular member 12 is attached to the outer periphery of both ends or one end 10 of the hose 1 with a reduced diameter, and then the insertion tube portion 20 of the fluid pipe 2 made of a metal pipe is inserted. One end 10 is fastened with a straight annular tubular member 16 to form a hose connection structure.

The hose 1 is basically made of rubber,
The present invention can be applied not only to a rubber alone but also to a rubber having a thin resin layer in an innermost layer or an intermediate layer. Regardless of the presence or absence of a reinforcing layer, when a reinforcing layer is applied, a fiber-based material is suitable. Therefore, in addition to a fuel system such as a fuel supply hose for a vehicle, a water system, a brake system, an air system, an oil system, and the like, a general piping hose used for general equipment is also targeted.
In the present embodiment, a fuel supply hose for a vehicle will be described in detail with reference to FIGS.

In FIG. 2, the hose 1 has an inner layer 1a and an outer layer 1b, and a reinforcing layer 1c made of vinylon or polyester fiber is provided at a boundary between the two. The inner layer 1a is made of gasoline-resistant rubber,
b is made of weather-resistant rubber. At one end 10 of the hose 1,
A straight annular tubular member 16 made of metal having an inner diameter substantially the same as or somewhat smaller than the outer diameter of the hose is externally fitted to form one end 10 of the hose. One end 10 of the hose 1 is provided with a fitting groove 10c in which an outer peripheral surface thereof is polished as necessary to form an annular concave portion having a predetermined width, and a straight annular cylindrical member 16 is fitted to the fitting groove 10c of the one end 10 of the hose. To be fitted. As shown in the figure, the peripheral wall of the cylindrical member 16 has a uniform thickness and has a right circular ring shape, so that the one end 10 of the hose 1 and the right circular cylindrical member 16 are in contact with each other. As a result, the one end 10 of the hose 1 can be uniformly and strongly tightened by the tubular member 16 with respect to the insertion tube portion 20.

More specifically, the inner diameter d of the hose at one end 10 is formed smaller than the outer diameter D of the insertion tube portion 20. In addition, the inner peripheral surface of the hose may be generally in a vulcanized state, but if necessary, a fixing layer mainly composed of rubber or resin may be provided so as to adhere to the outer periphery of the insertion tube portion 20. The properties can be further improved. Examples of the material of the fixing layer include a fluororubber coating agent, a phenolic resin coating agent, a silane coupling agent, a polymer-modified silicone oil, or a modified silicone rubber modified with fluorine, polyether, alcohol, or a mixture thereof. Is used. By providing these fixing layers, a good seal between the one end 10 of the hose and the insertion tube 20 is ensured.

Since the insertion pipe portion 20 is a part of the fluid pipe 2 of an automobile, a machine, a structure, or the like, the insertion pipe portion 20 may be a tip of a pipe for piping, but is a tubular portion formed to protrude from a functional portion. In some cases. The outer diameter D of the insertion tube portion 20 is slightly larger than the inner diameter d of the hose 10, and as shown in FIG. 2, a predetermined position (inner direction) away from the insertion tube portion 20 in the axial direction. (Behind) is formed a bead formed with a stopper 21 projecting outward in the radial direction for determining the insertion position of the one end 10 of the hose. An outer peripheral surface 20b extending from the distal end of the insertion tube portion 20 toward the flange-shaped stopper 21 has a protruding portion 22 having a saw-tooth cross section whose diameter decreases toward the distal end.
“a” is a nipple portion formed continuously from a plurality of portions, and the pull-out resistance with one end 10 is improved. As shown in FIGS. 5A and 5B, the shape of the insertion pipe 20 of the pipe (fluid pipe) is as follows.
There is no problem if a bulge portion 23 bulging radially outward is provided at the tip of 0, and a ring-shaped spool portion 24 is provided coaxially between the bulge portion 23 and the stopper 21.

Next, the insertion tube portion 20 of one end 10 of the hose
The connection to is described. First, one end 10 of a hose formed by fitting a straight annular tubular member 12 to the distal end portion in advance at the outer peripheral portion of the insertion tube portion 20 is fitted, and as shown in FIG. The inserted cylindrical member 16 is inserted until the tip of the fitted cylindrical member 16 contacts the side surface of the stopper 21.

At this time, the insertion tube portion 20 having an outer diameter larger than the inner diameter of the hose 1 is inserted into the one end 10 of the hose, so that it tries to expand in the radial direction. Member 12 prevents radial expansion of one end 10 of the hose. Therefore, the tightening force of the one end 10 of the hose with respect to the insertion tube portion 20 is relatively increased, and the fitting portion 10a between the straight annular tubular member 12 and the one end 10 of the hose is provided.
By changing the fitting state of, the tightening force can be changed to a corresponding one. Desirably, when the outer peripheral surface of the fitting portion 10a of the one end 10 of the hose is formed into a perfect circular shape by polishing, the fitting of the straight annular tubular member 16 to the one end 10 of the hose is performed reliably, Since the thickness of the peripheral wall of the cylindrical member 12 becomes more uniform and is in very uniform contact with the outer peripheral surface of the fitting portion 10a, the fastening to the insertion tube portion 20 is performed more uniformly. In addition, the present invention
The method for connecting the one end 10 of the hose to the insertion tube section 20 is not limited. That is, a hose connection structure can be configured by a method of connecting one end 10 of another hose to the insertion tube portion 20.

According to the present invention, one end of the hose is fastened to the insertion tube portion, and the annular tubular member 1 disposed on the outer periphery is tightened.
6 has a uniform thickness of the peripheral wall and a right circular ring shape, so that one end 10 of the hose 1 and the right circular ring cylindrical member 1
6 is uniformly performed. As a result, the one end 10 of the hose 1 can be uniformly and strongly tightened by the tubular member 16 with respect to the insertion tube portion 20. The pull-out property and the sealing property are enhanced, and a strong connection structure between the fluid pipe and the hose is obtained. In addition, since the straight annular tubular member 12 is fitted around the outer periphery of the one end 10 of the hose, the hose connection structure has no removing means, so that the connection portion can be prevented from being removed by a general user, and the hose and the pipe can be connected. Connection reliability is maintained.

Next, a second embodiment will be described. The second embodiment is different from the first embodiment only in the form of the annular tubular member, and the other configuration is the same as the first embodiment. As an example of the second embodiment, FIG.
As shown in (a), the straight annular tubular member 31 has spring elasticity, one circumferential portion of the peripheral wall is divided, and a clearance 31a is provided from one end in the axial direction to the other end. A pair of opposing end portions 31c and 31d are formed. If necessary, one end 10 of the hose to which the C-shaped right circular cylindrical member 31 having spring elasticity is fitted, as shown in FIG. An annular fitting groove 10c polished corresponding to the width of the cylindrical member 31 is provided. The outer diameter of the fitting groove 10c is
It is formed to be larger than the inner diameter of the cylindrical member 31 of a right annular shape.

Therefore, in the second embodiment, in addition to the effect of the invention of the first embodiment, due to the spring characteristic of the straight annular tubular member, it follows the set at one end of the hose in use. Since the tightening force always acts on the one end 10 of the hose, the set-up of the one end 10 of the hose 1 in use can be compensated for, and the pull-out resistance and the sealing property of the connection structure can be ensured for a long time. The hose can be used without forming the fitting portion 10a (fitting groove 10c) of one end 10 of the hose, but the axial position of the annular tubular member 31 is defined at a predetermined position by the fitting groove 10c. it can.

Next, a modification of the second embodiment will be described. As a first modification, as shown in FIG. 5 (b), a straight annular cylindrical member 32 is formed into a C shape in which a peripheral wall is axially divided at one location in the axial direction, and has a spring elasticity capable of expanding the diameter. In addition, a pair of opposed ends 32c and 32d facing each other in the circumferential direction are fitted in the circumferential direction in an uneven relationship to form an uneven clearance 32a. The hose shape is the same as that of the above-described embodiment. Similarly to the above-described tubular member 32, in addition to the effect of the invention of the above-described first embodiment, the hose in use is formed by the spring characteristics of the straight annular tubular member. Since the tightening force always acts on one end 10 of the hose following the set at one end of the hose, the set at the one end 10 of the hose 1 in use is compensated for, and the pull-out resistance and sealability of the connection structure are maintained for a long time. In this embodiment, the gap is 3
By forming the irregularities 2a, the clearance 31 described above can be obtained.
Since the pair of opposed end portions 32c and 32d overlap in the circumferential direction as compared with c, uniform tightening of the one end 10 of the hose over the entire circumference becomes possible.

As a second modification, as shown in FIG. 5 (c), a plurality of elongated holes 33a extending in the axial direction in the radial direction are provided at the intermediate position in the axial direction in the cylindrical member 33 in the shape of a circular cylinder. Things. Thereby, the one end 10 of the hose is connected to the insertion tube portion 2.
When the outer end is fitted to zero, one end 10 of the hose is cut into the elongated hole 33a, and the connection between the one end 10 of the hose and the insertion tube portion 20 is further improved in pull-out resistance and sealing performance. In addition, the bite of the one end 10 of the hose into the elongated hole 33a can prevent the rotation of the straight annular tubular member 33. Note that the gap 33b may be a straight line or an uneven shape.

In the above embodiment, the metal pipe 2 is used as the mating member (fluid pipe) to be inserted into the one end 10 of the hose, but other fluid pipes may be used. Further, the fluid pipe is not limited to metal and may be made of resin. As shown in FIGS. 5A and 5B, the shape of the insertion pipe portion 20 of the pipe (fluid pipe) is such that the bulge portion 23 bulges radially outward at the tip of the insertion pipe portion 20. May be provided, and a ring-shaped spool portion 24 may be provided coaxially between the bulge portion 23 and the stopper 21.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an embodiment of the present invention in a crushed section.

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

FIG. 3 is a perspective view of the annular tubular member of FIG. 2;

FIG. 4 is a cross-sectional view illustrating another example of the insertion tube portion of the fluid tube of the present invention.

FIG. 5 is a perspective view showing a plurality of typical annular cylindrical members for explaining another embodiment of the present invention.

[Explanation of symbols]

1: Rubber hose, 10: One end of hose, 10b, 1
0c: fitting groove, 2: fluid pipe, 20: insertion pipe part, 1
6, 31, 32, 33: straight annular tubular member, 31a, 3
2a, 33a: Clearance

Claims (3)

[Claims] 1. A rubber hose, a metal or resin fluid pipe having an insertion pipe inserted into at least one end of the hose, and the insertion pipe of the fluid pipe disposed around the outer circumference of the one end of the hose. A metallic annular tubular member having one end of the hose fastened to a portion thereof, the metallic annular tubular member having a peripheral wall having a uniform thickness, and the peripheral wall being annular in substantially the same circle. A hose connection structure, characterized in that the hose connection structure extends. 2. The hose connection structure according to claim 1, wherein the annular tubular member has spring elasticity, and the peripheral wall substantially crosses from one end in the axial direction to the other end, and is spaced at a circumferential interval. A hose connection structure having a pair of circumferentially opposed ends provided with a clearance, wherein a tightening force acts on the annular tubular member in a radially-reducing direction. 3. The hose connection structure according to claim 2, wherein said pair of opposed end portions of said annular tubular member are fitted in a circumferentially uneven relationship with each other, and said clearance is formed by a shaft. A hose connection structure characterized by being formed in an uneven shape from one end to the other end in the direction.