JP3981224B2 - Connector and resin tube connection structure using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connector for connecting a resin tube and a mating member such as a pipe for transferring fuel , and a resin tube connection structure using the connector.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various connectors have been used to connect various resin tubes of automobiles and pipes having an annular protrusion at an insertion end as a male function. Such a conventional connector is configured so that a female connector body can receive an insertion end portion of a pipe with a large diameter portion on one end side, and a hose such as a resin tube can be fitted on the outer periphery of a small diameter portion on the other end side. For this reason, there exists a problem that the length of a female connector main body will become long.
[0003]
Recently, fuel and air piping in automobiles have been replaced with inexpensive resin tubes from rubber hoses, and downsizing of piping devices is desired.
[0004]
As a hose connection structure that can be shortened and made compact, for example, a piping device having a connector described in Utility Model Registration No. 2554347 for connecting an elastic hose such as a rubber hose has a male female connector body with an annular protrusion. Since the shaft hole for receiving the member is provided and the end of the hose is fitted to the outer periphery of the cylindrical wall in which the shaft hole is formed, the hose connection structure can be configured compactly. However, since the hose of this connector is a rubber hose, it is easy to insert the hose into the outer periphery of the other end of the female connector, but an annular fastening member is required on the outer peripheral surface of the hose end.
[0005]
Further, the connection structure of the resin tube and the mating member shown in FIG. 6 has an advantage that the connection structure can be configured compactly because the end of the mating pipe 2 is substantially directly connected to the resin tube 1. . However, in this connection structure, the resin tube 1 needs to be blow-molded, and the first engagement portion 4 provided with the engagement claw 4b at the tip of the elastic arm 4a at the time of molding is formed on the outer periphery of the end portion of the resin hose 1. It is necessary to form the corresponding second engaging portion 5 at the other end of the mating pipe 2. For this reason, there existed a fault that a connection structure became expensive, such as requiring the metal mold | die for a some shaping | molding, and a manufacturing process becoming complicated.
[0006]
[Problems to be solved by the invention]
In view of such a conventional situation, the present invention can be made compact in the axial direction as well as the structure is simple, the cost can be reduced, and the end portion of the resin tube is easy. It is an object of the present invention to provide a connector that can be inserted into the connector, that does not require a fastening member, and that can securely seal and connect a resin tube and a male member, and a resin tube connection structure using the connector.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the connector for connecting a resin tube provided by the present invention can be fitted with an end of a resin tube extruded on the outer periphery on one end side, and an end of a male member on the inner periphery on the other end side. A fuel system resin tube connector for connecting parts,
The tubular body comprising an insertion end having an outer peripheral surface extending in parallel with the axis from the front end to the other end and projecting radially outward from the outer peripheral surface spaced apart from the front end and provided with an annular protrusion. A male member;
A parallel outer peripheral surface that extends substantially parallel to the shaft and that can be fitted with the resin tube on the other end side, and a tapered taper that is extended so that the outer diameter gradually decreases from the parallel outer peripheral surface toward one end. An outer peripheral surface, an annular concavo-convex portion provided on the parallel outer peripheral surface, an annular groove provided on the tapered outer peripheral surface, and a large-diameter portion having an inner diameter larger than the inner diameter on one end on the other end side, A female connector body having a shaft hole suitable for receiving the insertion end portion of the male member from the other end side, and having a pair of opposed opening windows formed in the cylindrical wall on the other end side When,
A holding member fixed to the female connector body;
A first seal member having an inner peripheral surface fitted to an inner peripheral surface of the large-diameter portion of the female connector main body and engaged with an outer peripheral surface of the male member;
A second seal member fitted in an annular groove provided on the outer peripheral surface of the taper of the female connector body,
When the insertion end of the male member is inserted into the shaft hole of the female connector body, the male member overlaps with the resin tube mounted on the outer periphery of the female connector body with the first seal member interposed therebetween. And the annular protrusion of the male member is snap-engaged with the holding member, and the female connector body and the male member are connected so as not to be detached without using a fastening member. To do.
[0008]
The resin tube connection structure provided by the present invention is a fuel-based resin tube connection structure in which a resin tube and a male member are fluid-tightly connected,
The tubular body comprising an insertion end having an outer peripheral surface extending in parallel with the axis from the front end to the other end and projecting radially outward from the outer peripheral surface spaced apart from the front end and provided with an annular protrusion. A male member;
A parallel outer peripheral surface extending substantially parallel to the axis on the other end side, a tapered tapered outer peripheral surface extending so that the outer diameter gradually decreases from the parallel outer peripheral surface toward one end, and the parallel outer peripheral surface Provided with an annular concavo-convex portion provided and an annular groove provided on the outer peripheral surface of the taper , and provided with a large diameter portion having an inner diameter larger than an inner diameter on one end side on the other end side, A female connector main body having a shaft hole suitable for receiving an insertion end portion and having a pair of opposed opening windows formed in a cylindrical wall on the other end side;
A holding member fixed to the female connector body;
An extruded resin tube having an end attached to the outer periphery of one end of the female connector body; and
A first seal member having an inner peripheral surface fitted to an inner peripheral surface of the large-diameter portion of the female connector main body and engaged with an outer peripheral surface of the male member;
A second seal member fitted in an annular groove provided on the outer peripheral surface of the taper of the female connector body,
The resin tube having an insertion end of the male member inserted into a shaft hole on the other end side of the female connector body, the male member being mounted on an outer periphery of the female connector body with the first seal member interposed therebetween; The male connector body and the male member are connected so that they overlap and the annular protrusion of the male member snap-engages with the holding member and the fastening member is not used. It is characterized by.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The resin tube connection structure of the present invention connects a resin tube and a male member using a connector having a simple structure with a small number of parts, and between the resin tube and the connector and without using a fastening member such as a clamp. And the male member can be reliably sealed, and particularly in the axial direction. Hereinafter, specific examples of the resin tube connection structure of the present invention and connectors used therein will be described in detail with reference to the drawings.
[0010]
As shown in FIGS. 1 to 3, the connector used in the resin tube connection structure of the present invention includes a cylindrical female connector body 10 provided with a pair of opening windows 16, 16 on the other end side, and the female connector body 10. And the first seal member 20 and the second seal member 21. A resin tube 35 can be fitted and fixed to the outer periphery of one end of the connector, and the male member 30 inserted and held on the inner periphery of the other end is an annular protrusion protruding radially outward from the outer peripheral surface of the insertion end 31. 32 is engaged with and connected to the holding member 17.
[0011]
The female connector main body 10 has a shaft hole 11 suitable for receiving the insertion end portion 31 of the male member 30 from the other end side, and as an outer peripheral surface thereof, the female connector main body 10 extends substantially parallel to the shaft on the other end side. The outer peripheral surface 12a and the taper outer peripheral surface 12b of the taper extended toward this end from this parallel outer peripheral surface 12a are provided. Further, a pair of opening windows 16, 16 facing each other are provided on the cylindrical wall on the other end side of the female connector main body 10, and a ring-shaped other end wall portion 15 is provided on the other end side of the pair of opening windows 16, 16. And a pair of opposing connecting wall portions 14, 14 extending in the axial direction are left between the pair of opening windows 16, 16 arranged in the circumferential direction.
[0012]
The large diameter portion provided on the other end side of the female connector main body 10 has a larger inner diameter than the one end side, and the inner diameter is larger than the outer diameter of the annular protrusion 32 protruding radially outward from the insertion end portion 31 of the male member 30. Is also formed large. A cylindrical first seal member 20 is fitted on the inner peripheral surface of the large-diameter portion so as to be flush with the inner peripheral surface of the small-diameter portion at one end of the female connector body 10. 20 end portions may protrude slightly into the opening windows 16 and 16. Further, at least one annular groove 13 is provided on the tapered outer peripheral surface 12b on one end side of the female connector body 10 by utilizing a thick portion between the small diameter portion of the shaft hole 11 and the inside of the annular groove 13. A ring-shaped second seal member 21 is fitted into the ring.
[0013]
The holding member 17 has a substantially U-shape including a pair of parallel leg portions 19, 19 and a cross portion 18 connecting the base portions of the pair of parallel leg portions 19, 19. , 19 are respectively provided with locking claws 19a, 19a protruding outward. When the parallel leg portions 19 and 19 of the holding member 17 are inserted through the pair of opening windows 16 provided in the female connector main body 10 from the radial direction, the locking claws 19a and 19a are connected to the connecting wall portions 14 and 14, respectively. Simultaneously with the locking, the parallel leg portions 19, 19 are engaged with the annular protrusion 32 of the male member 30 inserted into the shaft hole 11 of the female connector main body 10 from the other end, whereby the male member 30 is engaged with the female member 30. The connector body 10 is held so as not to move in the axial direction.
[0014]
Next, assembly of the resin tube connection structure of the present invention will be described. First, as shown in FIG. 1, the cylindrical first seal member 20 is fitted into the inner peripheral surface of the large-diameter portion on the other end side of the female connector main body 10. At that time, a pair of flange portions 20a, 20a facing the other end of the first seal member 20 are provided, and the flange portions 20a, 20a are inserted into the respective opening windows 16, 16 of the female connector body 10, and a female It is preferable to abut on the other end side surface of the connector body 10. An annular second seal member 21 such as an O-ring is fitted into the annular groove 13 provided in the tapered outer peripheral surface 12 b at one end of the female connector body 10.
[0015]
As shown in FIGS. 2 and 3, the end portion of the extruded resin tube 35 is inserted into the outer periphery of the female connector main body 10 and fixed. The outer peripheral surface on one end side of the female connector main body 10 is composed of a parallel outer peripheral surface 12a and a tapered outer peripheral surface 12b , and an annular second seal member 21 such as an O-ring is disposed in the annular groove 13 of the tapered outer peripheral surface 12b. Therefore, it is easy to fit and seal the extruded resin tube 35. Further, the end portion of the resin tube 35 can be firmly fixed by shrinking as usual after being fitted to the outer periphery of the one end side of the female connector main body 10. In order to prevent the resin tube 35 from being securely attached and prevented from coming off, as shown in FIGS. 2 and 3, a plurality of annular concavo-convex portions are formed on the parallel outer peripheral surface 12a on one end side of the female connector body 10. Is preferably provided.
[0016]
Thus, the insertion end 31 of the male member 30 is inserted into the connector having the resin tube 35 fastened to the outer periphery on one end side from the other end. The insertion end 31 of the male member 30 is inserted into a large diameter portion on the other end side of the female connector body 10 formed to have a larger diameter than the annular protrusion 32, and the annular protrusion 32 is the first seal member 20. It stops in contact with the flange 20a. At this time, the insertion end portion 31 of the male member 30 is inserted into the large diameter portion on the other end side of the female connector main body 10, and the annular protrusion 32 is positioned in the pair of opening windows 16 and 16. In this state, as shown in FIG. 2, the parallel leg portions 19, 19 of the holding member 17 are inserted from one opening window 16 of the female connector body 10 and are inserted through the other opening window 16.
[0017]
As shown in FIGS. 4 and 5, the parallel leg portions 19 and 19 of the holding member 17 inserted into the one opening window 16 are elastically deformed in the axial center direction and pass through the connecting wall portions 14 and 14, respectively. When the parallel leg portions 19 and 19 return to their original positions, the respective locking claws 19a and 19a are snap-locked to the connecting wall portions 14 and 14, respectively. On the other hand, each of the parallel leg portions 19 and 19 of the holding member 17 is inserted between the other end wall portion 15 remaining on the other end side of the opening windows 16 and 16 and the annular protrusion 32 of the male member 30. Since the annular projecting portion 32 is engaged with the flange portion 32a of the first seal member 20, the male member 30 is held by the connector so as not to move in the axial direction.
[0018]
In the resin tube connection structure thus assembled, the space between the female connector main body 10 and the insertion end 31 of the male member 30 is sealed with the cylindrical first seal member 20, and at the same time, the female connector main body 10 and the resin tube 35 are sealed. Is sealed by an annular second seal member 21 such as an O-ring disposed on the tapered outer peripheral surface 12b of the female connector body 10.
[0019]
The first sealing member 20 is formed by forming the first sealing member 20 slightly longer than the large-diameter portion of the female connector body 10 or by forming a flange portion 20a at the other end of the first sealing member 20. Are arranged so as to protrude slightly from the other end of the female connector body 10 into the pair of opening windows 16 and 16, even if there are some dimensional variations in the position of the annular protrusion 32 provided on the male member 30. Since it becomes easy to absorb, reliability is improved.
[0020]
【The invention's effect】
According to the present invention, the structure is simple, the cost can be reduced, the axial direction can be reduced, the end portion of the resin tube can be easily inserted, and the fastening member is unnecessary. And the connector which can seal and connect a resin tube and a male member reliably, and a resin tube connection structure using the same can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of each member for explaining assembly of a resin tube connection structure according to the present invention.
FIG. 2 is a schematic partially cutaway side view showing a specific example of a resin tube connection structure according to the present invention.
FIG. 3 is a schematic side view showing the resin tube connection structure of FIG. 2;
4 is a schematic cross-sectional view of the resin tube connection structure along the line AA in FIG. 3;
5 is a schematic front view of the resin tube connection structure of FIG. 3 as seen from the male member side (the other end side).
FIG. 6 is a schematic partially cutaway side view showing an example of a conventional resin tube connection structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin tube 2 Opposite pipe 3 O ring 4 1st engaging part 5 2nd engaging part 10 Female connector main body 11 Shaft hole 12a Parallel outer peripheral surface 12b Tapered outer peripheral surface 13 Annular groove 14 Connecting wall part 15 Other end wall part 16 Opening Window 17 Holding member 18 Cross portion 19 Parallel leg portion 19a Locking claw 20 First seal member 20a Collar portion 21 Second seal member 30 Male member 31 Insertion end 32 Annular protrusion 35 Resin tube

Claims (3)

A connector for a fuel system resin tube for connecting the end of a male member to the inner periphery of the other end side, making it possible to attach the end of the extruded resin tube to the outer periphery of the one end,
The tubular body comprising an insertion end having an outer peripheral surface extending in parallel with the axis from the front end to the other end and projecting radially outward from the outer peripheral surface spaced apart from the front end and provided with an annular protrusion. A male member;
A parallel outer peripheral surface that extends substantially parallel to the shaft and that can be fitted with the resin tube on the other end side, and a tapered taper that is extended so that the outer diameter gradually decreases from the parallel outer peripheral surface toward one end. An outer peripheral surface, an annular concavo-convex portion provided on the parallel outer peripheral surface, an annular groove provided on the tapered outer peripheral surface, and a large-diameter portion having an inner diameter larger than the inner diameter on one end on the other end side, A female connector body having a shaft hole suitable for receiving the insertion end portion of the male member from the other end side, and having a pair of opposed opening windows formed in the cylindrical wall on the other end side When,
A holding member fixed to the female connector body;
A first seal member having an inner peripheral surface fitted to an inner peripheral surface of the large-diameter portion of the female connector main body and engaged with an outer peripheral surface of the male member;
A second seal member fitted in an annular groove provided on the outer peripheral surface of the taper of the female connector body,
When the insertion end of the male member is inserted into the shaft hole of the female connector body, the male member overlaps with the resin tube mounted on the outer periphery of the female connector body with the first seal member interposed therebetween. And the annular protrusion of the male member is snap-engaged with the holding member, and the female connector body and the male member are connected so as not to be detached without using a fastening member. A connector for connecting fuel resin tubes . The holding member includes a pair of parallel leg portions and a cross portion connecting between the base portions of the pair of parallel leg portions, and the pair of parallel leg portions extends from one opening window of the pair of opening windows to the other. The connector for connecting a fuel system resin tube according to claim 1, wherein the connector is connected to the female connector body by being inserted into each of the opening windows. A fuel-based resin tube connection structure in which a resin tube and a male member are fluid-tightly connected,
The tubular body comprising an insertion end having an outer peripheral surface extending in parallel with the axis from the front end to the other end and projecting radially outward from the outer peripheral surface spaced apart from the front end and provided with an annular protrusion. A male member;
A parallel outer peripheral surface extending substantially parallel to the axis on the other end side, a tapered tapered outer peripheral surface extending so that the outer diameter gradually decreases from the parallel outer peripheral surface toward one end, and the parallel outer peripheral surface Provided with an annular concavo-convex portion provided and an annular groove provided on the outer peripheral surface of the taper , and provided with a large diameter portion having an inner diameter larger than an inner diameter on one end side on the other end side, A female connector main body having a shaft hole suitable for receiving an insertion end portion and having a pair of opposed opening windows formed in a cylindrical wall on the other end side;
A holding member fixed to the female connector body;
An extruded resin tube having an end attached to the outer periphery of one end of the female connector body; and
A first seal member having an inner peripheral surface fitted to an inner peripheral surface of the large-diameter portion of the female connector main body and engaged with an outer peripheral surface of the male member;
A second seal member fitted in an annular groove provided on the outer peripheral surface of the taper of the female connector body,
The resin tube having an insertion end of the male member inserted into a shaft hole on the other end side of the female connector body, the male member being mounted on an outer periphery of the female connector body with the first seal member interposed therebetween; The male connector body and the male member are connected so that they overlap and the annular protrusion of the male member snap-engages with the holding member and the fastening member is not used. A fuel-based resin tube connection structure characterized by the above.

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