JP3064633B2 - Quick joint for hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quick joint for connecting an end of a hose for transferring a fluid to another pipe.

2. Description of the Related Art Conventionally, a quick joint of this type has two joints: a large-diameter cylindrical body as a male type and a small-diameter cylindrical body as a female type inserted into the male type. Are known (for example, see Japanese Patent Application Laid-Open No. 64-1219).
No. 5). The large-diameter tubular body is attached to the connection source-side pipe, and the small-diameter tubular body is fitted and attached to the connected-side pipe, and an annular convex portion is formed on an outer peripheral surface of the small-diameter tubular body, A pair of claws are formed on the inner peripheral surface of the distal end opening of the large-diameter cylindrical body so as to be opposed to each other in the radial direction and engage with the annular convex portion. When connecting the small-diameter cylinder and the large-diameter cylinder, the small-diameter cylinder is press-fitted from the distal end opening of the large-diameter cylinder so that the two claw portions are mutually expanded, and the annular shape is formed. The convex portion is engaged over both claw portions, and conversely, at the time of pulling work, the two portions of the distal end opening portion in the other radial direction orthogonal to the radial direction connecting the both claw portions are reduced in diameter, and By forcibly expanding the two claw portions, the annular convex portion reversely moves over the claw portions and is disengaged, thereby being detachable.

However, in the above-mentioned conventional quick joint, since the large-diameter cylindrical body is attached by being fitted inside the connection source side pipe, the connection between the two is not sufficiently strong. Absent. For this reason, it is conceivable that the connection source side tube is tightened from the outer periphery to the inner large-diameter cylinder by a clamp means or the like. However, in this case, in addition to the connection work, the mounting work of the clamp means is required, and when the hose is fixed by the clamp means, the rubber hose may be set, deteriorated, cracked from the tightened portion, leaked, and the like. Moreover, since the large-diameter cylinder and the small-diameter cylinder are formed of a synthetic resin, they may be deformed by long-term use, and may particularly deteriorate the sealing performance. Further, in the conventional quick joint, the distal end opening of the large-diameter cylindrical body is pressed and sandwiched from outside on both sides, so that the engagement is released. When the pressing force acts on the portion, there is a possibility that the engagement between the two claw portions is released. In this case, since the flow pressure of the fluid flowing inside acts on the inner peripheral surface of the connection source or the connected side pipe, the small-diameter cylinder comes off the large-diameter cylinder at the same time as the disengagement of the engagement. There is a risk. In other words, as the attachment / detachment is free and the attachment / detachment operation is easy, the possibility of pull-out due to careless handling tends to increase. In particular, when the internal fluid is a fuel such as gasoline, it is required that the reliability of the joint connection be extremely high. Therefore, the above-mentioned conventional quick joint has insufficient reliability in the connection state, and thus has a problem in application as a joint such as the fuel hose. To cope with this, it is conceivable to add another reinforcing means to the joint between the small-diameter cylinder and the large-diameter cylinder after the connection. However, the demands for simplification of the joining work and reduction of the number of assembling steps have conventionally been issues in applying robot assembling in the field of automobile manufacturing, for example. This is contrary to the above request, because the work is increased and complicated. In the joint of the fuel hose, it is extremely important to confirm whether the joint is securely connected in the joining operation. However, in the conventional joint, the expanded claws cross over the annular convex portion and contract again. This is a subjective confirmation that you perceive changes in the outer shape of the opening at the tip of the large-diameter cylindrical body when the diameter is increased, or sounds when engaging with the above-mentioned projections, which is a sufficiently reliable confirmation. Not something. Furthermore, the conventional joint employs a configuration in which a concave groove is formed on the outer peripheral surface of the small-diameter cylindrical body, and a seal ring is fitted into the concave groove to prevent displacement. The diameter of the ring must be once expanded against the elastic force of the material, and this operation is troublesome, and the seal ring may be twisted to deteriorate the sealing performance. In addition, in the application to fuel hoses, it is necessary to consider the alcohol gasoline mixed with methanol or ethanol, which is expected to be adopted in the future, and to prevent the joint deterioration of the above alcohol gasoline in addition to the conventional gasoline. There is. The present invention has been made in view of such circumstances, and a first object of the present invention is to make it possible to firmly connect a main body portion of a joint and a hose, and to further form the main body portion. In that it can be reliably maintained. Also,
A second object is that the joining operation can be easily performed, and after joining, even if a pressing force is applied due to careless handling, the joining state is surely maintained. is there. Another object is to ensure the confirmation of the connection state, facilitate the installation of the seal ring, and improve the durability against new gasoline.

In order to achieve the above object, the invention according to claim 1 is characterized in that a bulging portion protruding radially outward on an outer peripheral surface of a pipe on a connection side, A rigid inner cylinder coaxially coupled to the end of the hose, and a joint body integrally formed by injection molding using a thermoplastic resin so as to cover the outer periphery of the rigid inner cylinder and the outer periphery of the end of the hose; And The rigid inner cylindrical body accommodates the connecting portion press-fitted into the distal end portion of the hose and the distal end portion of the pipe on the connected side, which is disposed so as to protrude outward from the distal end portion of the hose in the axial direction of the hose. And an accommodating section. The joint body, a hose fastening portion coupled to the distal end of the hose, and a pair of a pair projecting outward in the hose axial direction from respective positions radially opposed to each other at the distal end of the housing portion of the rigid inner cylinder. It consists of an extension part. The hose fastening portion is coupled to the hose in a state where the hose between the inner peripheral surface and the outer peripheral surface of the connection portion of the rigid inner cylinder is compressed and deformed inward in the radial direction. On the opposing surfaces of the two extending portions, a housing recess for housing the bulging portion of the pipe on the connected side, and in a direction facing each other from positions adjacent to the outer sides of the housing recesses in the hose axial direction. A projection is formed to form a lock claw that stops the outward movement of the bulging portion in the axial direction of the hose by hitting the bulging portion. The two extensions are connected to each other by a spring ring. Then, the spring ring is connected to a ring portion which is fitted around the outer periphery of each extension portion at the hose axial position where the both lock claws are formed, and another radial direction orthogonal to the direction connecting the both lock claws. The outer peripheral surface of the pipe on the connection side or the bulging portion protrudes from each position of the ring portion facing to the hose axial position different from the two lock claws, and protrudes inward in the radial direction. And a pair of restricting claws abutting on the outer peripheral surface. According to a second aspect of the present invention, in the first aspect of the present invention, holes are formed in each of the extending portions on the outer peripheral surface and the inner surface of the housing recess, and a connection state checking pin is formed in each of the holes. Place. One end of each pin contacts the outer peripheral surface of the bulging portion of the connected pipe, with one end thereof protruding inward from the outer peripheral surface position of the bulging portion of the connected pipe. In this configuration, a state in which the other end of the pin is in contact with and protrudes from the outer peripheral surface of the extension portion is held so as to be able to advance and retreat. According to a third aspect of the present invention, in the first aspect of the invention, a portion of the joint body that covers the housing portion of the rigid inner cylinder is divided into at least four parts in a circumferential direction, and radially opposed to each other. Each of the pair of divided pieces has an extension. Then, each of the divided pieces provided with the extending portions is configured to be releasably brought into contact with the outer peripheral surface of the accommodation portion. According to a fourth aspect of the present invention, in the first aspect of the present invention, the housing portion of the rigid inner cylinder is formed to have a diameter larger than that of the connecting portion, and a step is formed at a boundary between the two.
Then, at least one seal ring and two spacer rings sandwiching both sides of the seal ring in the axial direction of the hose are inserted into the accommodation portion, and one of the two spacer rings is applied to the inner peripheral surface of the step portion. The seal ring is positioned at a predetermined position. further,
According to a fifth aspect of the present invention, in the invention of the fourth aspect, at least the inner peripheral surface of the hose is formed of fluororesin or fluororubber, the rigid inner cylinder is formed of metal, and the seal ring and the spacer ring are formed of fluorine. The structure is made of resin or fluoro rubber.

According to the above-mentioned structure, according to the first aspect of the present invention,
The outer peripheral surface of the hose is compressed and deformed radially inward with respect to the outer peripheral surface of the connecting portion of the inner rigid inner cylinder by the resin pressure at the time of injection molding of the joint body. Since the hose fastening portion that is in close contact with the surface is formed, the joint body and the hose are firmly connected. In addition, since the rigid inner cylinder is disposed inside the joint main body, the rigid inner cylinder functions as a core material, and the shape of the joint main body is reliably maintained. Further, since the two regulating claws of the spring ring are in contact with the bulging portion, the diameter of the spring ring in the radial direction connecting the two regulating claws is prevented. As a result, the expansion of the spring ring in other radial directions orthogonal to the radial direction is prevented,
The expansion of the other lock claws in the other radial directions is prevented.
For this reason, in the coupled state where the pipe on the connected side is inserted into the joint body side and the regulating claws abut against the bulging portion, the locked state of the lock claws with the bulging portion is reliably maintained. Is done. According to the second aspect of the present invention, in addition to the effect of the first aspect, the pipe on the connected side is inserted into the joint body side and the swelling portion enters the housing portion, so that one end of each pin is connected. The other end is pushed by the bulging portion and the other end projects from the outer peripheral surface of the extending portion. According to the third aspect of the present invention,
In addition to the operation according to the described invention, since each extension provided with the lock claw can be separated from the rigid inner cylinder together with the division covering the accommodating portion of the rigid inner cylinder, each of the divisions is formed of the joint body. The two locking claws are fully expanded by bending from the hose fastening portion side, and restored. In the invention according to claim 4,
In addition to the operation according to the first aspect of the present invention, at the time of press-fitting the rigid inner cylinder into the hose, the rigid inner cylinder is press-fitted to the stepped position to thereby position the rigid inner cylinder relative to the hose. Is surely at a predetermined position. Also, when installing the seal ring, the spacer ring is inserted into the spacer by applying it to the inner peripheral surface of the step, so that the processing seal ring sandwiched between this spacer ring and other spacer rings is based on the step. Is arranged at a predetermined position. further,
Because the seal ring is inserted into the rigid inner cylinder, that is, the mounting operation can be performed by alternately dropping the spacer ring and the seal ring into the rigid inner cylinder, The work is easy. According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect of the present invention, even if the internal transfer fluid is a new type of gasoline to which methanol or the like is added, the portion directly in contact with the gasoline is a counterpart. Since it is formed of a fluororesin or fluororubber having excellent solvent properties and chemical resistance, those portions do not deteriorate.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a quick joint according to an embodiment in which the present invention is applied to a fuel hose. Reference numeral 1 denotes a hose on a connection source side, and reference numeral 2 denotes a metal rigidity fitted inside the hose 1 coaxially with a hose axis X thereof. An inner cylinder 3, a joint body covering the outer circumference of the hose and the rigid inner cylinder 2, a spring ring 4, and an insertion pipe which is a pipe on the connection side inserted into the rigid inner cylinder 2 It is. Main part 1a of the hose 1
Is formed of synthetic rubber, and a reinforcing layer 1b is embedded in the main portion 1a. Further, a thin film layer 1c made of a fluororesin is formed in the innermost layer portion constituting the inner peripheral surface of the hose 1. Here, as the synthetic rubber used for the main part 1a, ECD (ethylene oxide / epichlorohydrin copolymer), CHR (epichlorohydrin rubber), NBR (acrylonitrile butadiene rubber), AR (acryl rubber), AR / FKM (acryl rubber) / Fluorine rubber blend) or CSM (chlorosulfonated polyethylene rubber). Also,
The fluororesin used for the thin film layer 1c is PTF
E (polytetrafluoroethylene), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkylvinyl ether copolymer), PCTFE (polychlorotrifluoroethylene), PVDF (polyfluorinated) Vinylidene), ETFE (ethylene / tetrafluoroethylene copolymer), ECTFE (ethylene / chlorotrifluoroethylene copolymer) and the like may be used. The rigid inner cylinder 2 is formed on the inner side (the left side in FIG. 1) of the hose axis X direction, and is formed on the connection part 6 with the hose 1 and on the outer side (the right side in FIG. 1). A housing 7 for accommodating the distal end portion 5a of the insertion pipe 5, two O-rings 8 and 8 made of a fluoro rubber, which are seal rings fitted on the inner peripheral surface of the housing 7, and three fluororesins. And spacer rings 9, 9, 9 made of the same. Here, the fluoro rubber used for the O-ring 8 is mainly composed of VDF (vinylidene fluoride), HFP (hexafluoropropylene), TFE (tetrafluoroethylene), P
Binary or ternary VDF-HFP, VDF-HFP- containing FP (pentafluoropropylene), PFMVE (perfluoromethylvinyl ether), CTFE (chlorotrifluoroethylene) or the like as its copolymerization component
TFE system, VDF-PFP system, VDF-PFP-TFE
System, VDF-PFMVE-TFE system, VDF-CTFE
A fluorocarbon rubber, a P / TFE (propylene / tetrafluoroethylene) fluorocarbon rubber, or the like may be used. The fluororesin used for the spacer ring 9 may be selected from the same fluororesins used for the thin film layer 1c of the hose 1. The connecting portion 6 has an outer diameter smaller than the outer diameter of the hose 1, and the housing portion 7 has an outer diameter substantially the same as the outer diameter of the hose 1. A tapered surface constituting the portion 2a is formed. The rigid inner cylinder 2 is provided with the stepped portion 2a.
Are arranged so that an annular groove is formed between the tapered surface of the hose 1 and the end face of the distal end opening 1d of the hose 1.
A plurality of annular convex portions 6a, 6a,... Protruding radially outward on the outer peripheral surface of the connection portion 6, and annular concave portions 6b, 6b,. They are formed alternately. And the connection part 6 is a hose 1
When the hose 1 is press-fitted into the inside through the opening, the inner peripheral surface of the hose 1 is in close contact with the outer peripheral surface of the irregularities formed by the convex portions 6a and the concave portions 6b. 1 are connected. The O-rings 8 and the spacer rings 9 are alternately fitted on the inner peripheral surface of the housing portion 7, and the O-rings 8 are sandwiched between the spacer rings 9 and mutually attached in the hose axis X direction. It is designed to be positioned at a predetermined distance. That is, the left end of the first spacer ring 9 on the inner side in the hose axis X direction is positioned by being stopped against the inner surface of the stepped portion 2 a of the rigid inner cylinder 2. The first O-ring 8 is fitted on the right side, and
Spacer ring 9, second O-ring 8, and third ring
The inner peripheral edge of the right end of the third spacer ring 9 is fixed by caulking the distal opening edge 2b of the rigid inner cylindrical body 2 inward in the radial direction. I have. The inner peripheral surface of each of the spacer rings 9 is formed to have substantially the same inner diameter as both the inner diameter of the hose 1 and the outer diameter of the distal end portion 5a of the insertion pipe 5.
The joint body 3 includes a hose fastening portion 3a that covers an outer peripheral surface of the hose 1, a root portion 3b that covers a distal end portion of the hose 1 and a step 2a of the rigid inner cylinder 2, and a root portion 3b.
b, a pair of holding pieces 3c, 3c extending outward in the direction of the hose axis X to cover the outer peripheral surface of the accommodating section 7 of the rigid inner cylindrical body 2 from the positions opposed in the radial direction of b. 3c, a pair of engaging pieces 3d, 3d extending rightward from the base 3b and protruding outward from the housing 7 in the hose axis X direction.
These are integrally formed by injection molding using, for example, a thermoplastic resin such as a polyamide resin.
The hose fastening portion 3a is formed on the outer peripheral surface of the hose 1 in substantially the same range as the range in which the connecting portion 6 of the rigid inner cylindrical body 2 is fitted inside the hose 1, and cuts into the outer peripheral surface. The hose 1 is in a state of being tightened radially inward. That is, due to the resin pressure at the time of the injection molding, the peripheral wall portion of the hose 1 is compressed and deformed inward in the radial direction with respect to the uneven outer peripheral surface of the connection portion 6 of the rigid inner cylindrical body 2 and caulked. I have. The root portion 3b is formed such that the molding resin bites into and adheres to the concave groove portion formed by the distal end opening edge portion 1d of the hose 1 and the step portion 2a, and the root portion 3b bulges outward in the radial direction. The two holding pieces 3c, 3c
Are arranged so as to oppose each other in the radial direction, and hold the housing portion 7 in close contact with the respective portions obtained by dividing the outer peripheral surface of the housing portion 7 of the rigid inner cylindrical body 2 into substantially four parts. Further, the pair of engaging pieces 3d, 3d are connected to the two holding pieces 3c, 3d.
c and an arm 3e which is disposed opposite to another radial direction orthogonal to the radial direction and which comes into contact with the other four divided parts of the outer peripheral surface of the housing portion 7 in a releasable manner. ,
An extension 3f protruding outward from the hose axis X from the arm 3e. The extending portion 3f is fitted with a lock claw 10 protruding inward in the radial direction from the inner circumferential surface and a spring ring 4 described later formed on the outer circumferential surface at a radially outer position surrounding the lock claw 10. A concave groove 11, an accommodation concave portion 12 formed in the inner peripheral surface between the lock claw 10 and the distal end opening edge portion 2 b of the rigid inner cylindrical body 2 by being radially outwardly recessed; And a hole 13 which is opened in the radial direction and penetrates in the radial direction. Each of the lock claws 10 is connected to an insertion pipe 5 described later.
And a tapered guide surface 10a whose diameter gradually increases outward in the direction of the hose axis X of each lock claw 10 and the hose of each lock claw 10 A radial stopper surface 10b which forms a part of the inner surface of the accommodation recess 12 is provided on the inner side in the axis X direction. A pin 14 is inserted and held in each of the holes 13 so as to be able to advance and retreat in the radial direction. Up to the position protruding inward from the position.
2 so as to protrude. The spring ring 4 is
As shown in detail in FIG. 5 and FIG.
And a pair of restricting claws 4b, 4b protruding in the hose axis X direction from radially opposed positions on one end face of the ring portion 4a. The restricting claws 4b are arranged so as to face each other in the other radial direction orthogonal to the radial direction connecting the lock claws 10, and the hose shaft X from the fitting concave groove 11 to the housing concave portion 12 is provided. Projecting in a radial direction from a position shifted in the hose axis X direction by substantially the same length as the distance in the direction of the hose, and a later-described bulging portion 5b of the insertion pipe 5 in a connected state (a state shown by a chain line in FIG. 6). To come into contact with the outer peripheral surface. The insertion pipe 5 has a tip portion 5 a having substantially the same length as the housing portion 7 of the rigid inner cylinder 2 in the hose axis X direction and having an outer diameter substantially equal to the inner diameter of each spacer ring 9. A bulging portion 5b formed on the inner side of 5a and protruding outward in the radial direction and having a predetermined outer diameter. Next, a method of manufacturing the quick joint having the above configuration will be described with reference to FIG. First,
An annular convex portion 6a, 6a,... And a circular concave portion 6b, 6b,... Having a predetermined diameter are formed on one side of the rigid inner cylindrical body 2 by press working or roll working to form the connecting portion 6, which is the other side. The three spacer rings 9, 9, 9 and the two O-rings 8, 8 are alternately fitted in the housing 7. Then, after caulking the distal end opening edge 2b of the rigid inner cylindrical body 2 to fix the positions of the spacer rings 9 and the O-rings 8, the connection portion 6 is pressed into the hose 1 from the distal end opening. Next, the rigid inner cylinder 2 and the hose 1 in this state are put into an injection mold, and the joint body 3 is injection-molded with a predetermined resin pressure. Thus, the hose 1 is compressed radially inward by the resin pressure and caulked, and the hose 1 is connected to the hose 1 while the inner peripheral surface of the hose 1 is pressed against the outer peripheral surface of the connection portion 6. A portion 3a is formed. Then, the fitting groove 1 of the pair of extending portions 3f, 3f is formed.
The ring portion 4a of the spring ring 4 is fitted into the first and the first 11 so that the pair of regulating claws 4b and 4b are arranged toward the inside of the accommodation recess 12, and the pin 14 is inserted into both holes 13 and 13 at the tip. Each of them is inserted into the recess 12 until it protrudes.
Then, a bulging portion 5b having a predetermined diameter is formed at a predetermined position from the distal end of the insertion pipe 5 by leaving a portion having a length corresponding to the distal end portion 5a, for example, by bulging. Thus, the manufacture of the quick joint ends. Next, a procedure for connecting the insertion pipe 5 to the joint body 3 will be described with reference to FIGS. 1, 8 and 9. First, insert pipe 5
Are arranged opposite to each other on the hose axis X with respect to the joint body 3. Next, the tip 5a is connected to a pair of lock claws 1.
Insert into the joint body 3 from between 0 and 10,
When the bulging portion 5b is pushed into the housing concave portion 12 until the bulging portion 5b hits the opening edge 2b of the rigid inner cylinder 2, the joining operation is completed. At the time of the insertion, the bulging portion 5b hits each guide surface 10a of each of the lock claws 10, and slides along each guide surface 10a.
3f is pushed radially outward. As a result, the arms 3e, 3e bend from the base 3b and move away from the outer peripheral surface of the housing 7, so that the lock pawls 10, 10 are expanded and pushed by the extensions 3f, 3f. The spring ring 4 is deformed into an elliptical shape. The spring ring 4 is maximally deformed when the bulging portion 5b is inserted up to the positions of the lock claws 10 and 10 (the state shown in FIGS. 8 and 9). The claws 4b, 4b are displaced to a position close to the outer peripheral surface of the distal end portion 5a of the insertion pipe 5. Then, the bulging portion 5b is connected to both lock claws 10, 1
0, the locking pawls 10 and 10 are restored and closed by the elastic restoring force of the material and the elastic restoring force of the spring ring 4 at the same time as they enter the housing recess 12. The bulging portion 5 into which the 4b has entered.
b comes into contact with the outer peripheral surface to be connected. When the lock claws 10, 10 are expanded, the arm 3e is not adhered to the rigid inner cylindrical body 2, and each engagement piece 3d is elastically deformed in a range from the base 3b to the extension 3f. Since the joint body 3 is made of a relatively hard resin, the extension portions 3f, 3f can be reliably expanded and restored to a predetermined amount even when the joint body 3 is formed of a relatively hard resin, and the insertion work of the insertion pipe 5 is facilitated. Can be done. In the coupled state, both sides of the bulging portion 5b of the insertion pipe 5 in the direction of the hose axis X are sandwiched between the stopper surfaces 10b of the lock claws 10 and the distal end opening edge 2b of the rigid inner cylinder 2. Therefore, the relative movement of the insertion pipe 5 and the joint body 3 in the hose axis X direction can be reliably stopped. In addition, the tip 5
Since each O-ring 8 is compressed between a and the accommodation portion 7,
The space between the two 5a and 7 can be reliably sealed. Further, the two regulating claws 4b, 4b abut on the bulging portion 5b, and the radial spring ring 4 connecting the two regulating claws 4b, 4b.
As a result, the deformation of the spring ring 4 in the direction in which the lock claws 10, 10 expand can be surely prevented. For this reason, even if a pressing force in any direction acts on each of the extending portions 3f and the spring ring 4 from the outside, it is possible to reliably prevent the locking claws 10, 10 from expanding. In addition, the swelling portion 5b is not
2, the bulging portion 5b hits each pin 14 and pushes each pin 14 outward in the radial direction.
Each pin 14 protrudes from the outer peripheral surface of each extension 3f.
An operator sees the protrusion of each pin 14 from the outside, and confirms that the bulging portion 5b has climbed over each of the lock claws 10 and entered the housing recess 12, that is, has been brought into a connected state. be able to. When it is necessary to remove the insertion pipe 5 after the insertion pipe 5 is connected to the joint body 3, the spring ring 4 may be cut by, for example, a wire cutter. In this case, after the insertion pipe 5 is pulled out, another similar spring ring 4 can be fitted into the two extension portions 3f, 3f again, so that the insertion pipe 5 can be reconnected. The hose 1 and the joint body 3 are connected to each other by the hose fastening portion 3a.
Is tightly coupled to the hose 1 in a radially inwardly compressed state and is tightly and securely sealed without using any other clamping means. Can be integrated. Also,
Since the rigid inner cylinder 2 disposed inside the joint main body 3 functions as a core material, the shape of the joint main body 3 can be reliably maintained. Further, since the joint main body 3 is formed around the outer periphery of the metal rigid inner cylinder 2 press-fitted into the hose 1, even if the transfer medium in the hose 1 is a fuel such as gasoline, the gasoline is used as the joint main body. 3 can be prevented from directly contacting, and the deterioration of the joint body 3 due to the gasoline or the like can be reliably prevented. In addition, since the rigid inner cylinder 2 is arranged inside the joint body 3, the rigidity of the entire joint is maintained by the rigid inner cylinder 2, so that the joint body 3 is relatively softly engaged. The piece 3d can be formed of a material that is easily bent, and the insertion work of the insertion pipe 5 can be facilitated. Further, since the thin film layer 1c on the inner peripheral surface of the hose 1 and the seal ring 8 and the spacer ring 9 that come into contact with the transfer fluid are formed of fluororesin or fluororubber having excellent solvent resistance and chemical resistance, Even if the transfer medium is a newly developed gasoline in which methanol or ethanol is added to conventional gasoline, extremely excellent non-permeability to the fuel can be exerted and the fuel can be reliably sealed. Degradation can be reliably prevented. When the connecting portion 6 is press-fitted into the hose 1, a step 2 a is formed at the boundary between the connecting portion 6 of the rigid inner cylinder 2 and the housing portion 7. It is sufficient to press-fit the hose 1 to the position of the step 2a, so that the press-fitting operation can be performed easily and reliably.
In addition, since the stepped portion 2a is provided, when each of the spacer rings 9 and the like are inserted, the respective spacer rings 9 are simply dropped into the accommodation portion 7 so that the spacer rings 9 are removed.
Stops at the step portion 2a and can be reliably positioned at a predetermined position, so that the mounting work of each spacer ring 9 and each O-ring 8 can be easily and reliably performed. It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications. That is, in the above-described embodiment, the rigid inner cylinder 2 is formed of metal. However, the present invention is not limited to this. For example, if the rigid inner cylinder 2 has predetermined rigidity and has solvent resistance and chemical resistance, for example, It may be formed of a synthetic resin. In the above embodiment, the two restricting claws 4 of the spring ring 4 are used.
Although the diameter reduction is prevented by bringing the b and 4b into contact with the bulging portion 5b, the present invention is not limited to this. You may make it. The spring ring 4 in the above embodiment is
As long as it has a predetermined elastic force, any material may be selected from, for example, spring steel and synthetic resin. In the above embodiment, the bulging portion 5b of the insertion pipe 5 is formed by bulging. However, the present invention is not limited to this. Further, in the above embodiment, the hose fastening portion 3a is formed by the resin pressure at the time of the injection molding to form the hose 1
However, in addition to this, the outer peripheral surface of the hose 1 may be preliminarily chlorinated and the both may be adhered. Furthermore, in the above-described embodiment, the case where the present invention is applied to a fuel hose has been described. However, the present invention is not limited to this, and can be applied to uses other than the fuel hose by appropriately changing the material of each part. For example, when applied to a cooler hose, a synthetic rubber such as NBR (acrylonitrile butadiene rubber), EPDM (ethylene propylene diene terpolymer rubber) or CSM (chlorosulfonated polyethylene rubber) is used for the main portion 1a of the hose 1. . In addition, 6 nylon, 66 nylon, 11 nylon are provided on the thin film layer 1 c and the spacer ring 9 constituting the peripheral surface of the hose 1.
A polyamide resin such as nylon or 12 nylon is used. Further, the above-mentioned fluorine rubber may be used for the seal ring 8. In addition, the quick joint can be applied to various fluid hoses by changing the rubber layer and the reinforcing thread layer according to the properties and pressure of the transfer fluid. In addition, various modifications made by those skilled in the art can be made without departing from the spirit of the present invention.

As described above, according to the hose quick joint according to the first aspect of the present invention, the peripheral wall portion of the hose between the hose fastening portion and the rigid inner cylinder is compressed and deformed radially inward. In the swaged state, the hose fastening portion can be brought into close contact with the outer peripheral surface of the hose, and the hose and the joint body are firmly and securely sealed without using other clamping means or the like. Can be integrated with each other. In addition, since the rigid inner cylindrical body disposed inside the joint main body functions as a core material, the shape of the joint main body can be reliably maintained. Furthermore, since the pipe on the connection side is accommodated inside the rigid inner cylinder, it is possible to prevent the fluid transferred inside from directly contacting the joint body, and the fluid by the fluid Deterioration of the joint body can be prevented. In addition, the two restricting claws come into contact with the bulging portion of the pipe on the connected side, so that the above-described deformation of the spring ring in the direction in which the two locking claws expand can be reliably prevented, and each of the extending portions and the springs can be prevented. Even if a pressing force in any direction acts on the ring or the like from outside, it is possible to reliably prevent the above-mentioned lock claws from expanding. This makes it possible to reliably prevent the connection-side pipe from being pulled out after being connected to the connection-source hose. According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, each of the pins is pushed by the bulging portion entering the housing concave portion, so that the pin is pushed from the outer peripheral surface of each extending portion. Since the pins protrude, the protrusion of each pin can be seen from the outside by an operator. Can be confirmed. According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the described invention, since each extension provided with the lock claw can be separated from the rigid inner cylinder together with the divided piece covering the accommodating portion of the rigid inner cylinder, the extension of the lock claw can be prevented. When a force is applied, the range from the hose fastening portion of the joint body to the distal end side can be elastically deformed and bent, and even if the joint body is formed of a relatively hard resin, the lock pawl can be securely expanded to a predetermined amount. Can be opened and restored,
The work of inserting the pipe on the connected side can be easily performed. According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, it is possible to press-fit the rigid inner cylindrical body into the hose using the step as a guide. Can be easily and reliably performed. In addition, since the step portion is provided, the seal ring can be reliably positioned at a predetermined position by applying each spacer ring to the step portion, and furthermore, it is only necessary to simply drop each spacer ring into the accommodation portion. Therefore, the mounting work of each spacer ring and each O-ring can be performed easily and reliably. According to the invention of claim 5, in addition to the effect of the invention of claim 4, the inner peripheral surface and the seal ring of the hose are formed of a fluorine resin or the like having excellent solvent resistance and chemical resistance. Therefore, even if the transfer fluid is a new type of gasoline in which methanol or ethanol is added to conventional gasoline, the hose can be surely prevented from deteriorating, and is suitable as a quick joint for such gasoline. Things can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a front view of a spring ring.

FIG. 6 is a sectional view taken along line DD of FIG. 5;

FIG. 7 is a cross-sectional view of the disassembled state showing the manufacturing method of the embodiment.

FIG. 8 is a partially cutaway side view showing a state where the insertion pipe is being inserted.

FIG. 9 is a sectional view taken along line EE in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hose 2 Rigid inner cylindrical body 2a Step part 3 Joint main body 3a Hose fastening part 3d Engagement piece part (divided piece) 3f Extension part 4 Spring ring 4b Restriction claw 5 Insertion pipe (tube on connection side) 5a Insertion pipe Tip part 5b Swelling part 6 Connection part 7 Housing part 8 O-ring (seal ring) 9 Spacer ring 10 Lock claw 12 Housing concave part 14 Pin X Hose shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 37/00-37/58

Claims (5)

(57) [Claims] 1. A swelling portion protruding radially outward on an outer peripheral surface of a pipe on a connection side, a rigid inner cylinder body coaxially coupled to a distal end of a hose on a connection source side, and the rigid inner cylinder. And a joint body integrally formed by injection molding using a thermoplastic resin so as to cover each outer periphery of the body and the distal end of the hose. The rigid inner cylinder is press-fitted into the distal end of the hose. A connecting portion, and a housing portion that protrudes outward from the distal end portion of the hose in the axial direction of the hose and accommodates the distal end portion of the pipe on the connected side. A hose fastening portion coupled to the distal end portion, and a pair of extending portions projecting outward in the hose axial direction from respective positions radially opposed to each other at the distal end of the housing portion of the rigid inner cylindrical body. And the hose fastening portion has an inner peripheral surface and the rigid inner cylinder. The hose between the outer peripheral surface of the connecting portion and the hose is connected to the hose in a state of being compressed and deformed inward in the radial direction. A housing recess for accommodating the bulge portion of the tube, and projecting in opposite directions from respective positions adjacent to the outer sides of the two housing recesses in the hose axial direction and hitting the bulge portion by hitting the bulge portion. A lock claw for stopping outward movement in the axial direction of the hose is formed, and the extending portions are connected to each other by a spring ring.
Ri, the spring ring, the both locking claws are formed hose
A ring part fitted around the outer periphery of each extension part at the axial position
And the other radial direction perpendicular to the direction connecting the lock claws
From each position of the ring part facing each other,
Are projected to different hose axial positions and
Outer peripheral surface of the pipe on the connected side
A quick joint for a hose, comprising a pair of regulating claws abutting on an outer peripheral surface of the bulging portion . 2. An opening is formed in each of the extending portions on the outer peripheral surface and the inner surface of the accommodation recess, and a pin for confirming a connection state is arranged in each of the holes. A state in which one end protrudes inward from the outer peripheral surface position of the bulging portion of the connected pipe into the housing concave portion, and the other end of the pin is in contact with the outer peripheral surface of the bulging portion of the connected pipe. the extended portion hose quick joint movably held claims 1 Symbol placement between a state of protruding from the outer peripheral surface of the. 3. A joint body portion covering a housing portion of the rigid inner cylinder is divided into at least four parts in a circumferential direction,
An extended portion is provided on each of a pair of radially opposed divided pieces, and each of the divided pieces provided with the extended portion is releasably contacted with the outer peripheral surface of the housing portion. and has claim 1 Symbol placement quick joint hose. 4. A housing portion of the rigid inner cylindrical body is formed to have a larger diameter than the connection portion, and a step is formed at a boundary position between the two, and at least one seal ring is provided in the housing portion. Two spacer rings sandwiching both sides in the axial direction of the hose are inserted therein, and the seal ring is positioned at a predetermined position in a state where one of the two spacer rings is in contact with the inner peripheral surface of the step portion. claim 1 Symbol placement quick joint hose. At least the inner circumferential surface of 5. hose is formed by a fluororesin or fluororubber, rigid inner cover is formed by a metal, according to claim 4 in which the seal ring and spacer ring is formed by a fluororesin or fluororubber Quick joint for hoses as described.