JP3470158B2 - Hose with joint - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a hose having a joint formed by processing the hose itself. [0002] For example, a nylon tube excellent in gasoline impermeability is used as a fuel supply hose of an automobile. However, a hose made of resin such as nylon has a high rigidity, and it is difficult to fasten it with a clip or the like like a rubber hose. Therefore, in order to detachably connect to a pipe or the like, a connecting structure using a connector has conventionally been adopted. As a connection structure, for example, as shown in FIG. 7, a structure is known in which a connector 200 is connected to a nylon tube 100 and a pipe 300 is connected to the connector 200. Here, the connector 200 includes a first cylindrical portion 201 inserted into the nylon tube 100,
And a second cylindrical portion 202 into which the pipe 300 is inserted. A plurality of ring-shaped protrusions 203 for retaining are formed on the outer periphery of the first cylindrical portion 201. An O-ring 204 is held on a part of the outer periphery. [0004] Two pairs of O-rings 205 are also held on the inner peripheral surface of the second cylindrical portion 202. And the second cylindrical portion 20
A tapered tube-shaped retainer 400 is fitted from the opening at the end of the pipe 2, and is engaged with a ring-shaped bead portion 301 formed on the pipe 300 to prevent the pipe 300 from coming off from the connector 200. In order to form this connection structure, first, the first cylindrical portion 2 is placed in the nylon tube 100.
By press fitting 01, the nylon tube 100 and the connector 200 are airtightly integrated via the O-ring 204. Then, the pipe 300 is inserted from the other end of the connector 200. At this time, the outer peripheral surface of the pipe 300 and the second cylindrical portion 20
The O-ring 205 is pressed against the inner peripheral surface of the pipe 2 to obtain a seal structure, and the retainer 400 is fitted into the cylindrical space between the second cylindrical portion 202 and the pipe 300, and the retainer 400
By bringing the tip into contact with the bead part 301, the tip of the second cylindrical part 202 is engaged with the engagement groove 401 provided in the retainer 400. Thereby, the retainer 400 is held in the second cylindrical portion 202 and functions as a stopper for the pipe 300. When the pipe 300 is pulled out of the connector 200, the retainer 400 is pulled from a direction not in contact with the bead portion 301 at the tip of the retainer 400 protruding from the end face.
By inserting a jig for increasing the outer diameter of the abutment with the bead portion 301, the retainer 400 is disengaged from the second cylindrical portion 202 while releasing the engagement between the engagement groove 401 and the second cylindrical portion 202. Pull out. Thereby, the pipe 300 can be removed from the connector 200. [0006] However, in the above-mentioned connection structure, a connector and a retainer are required, and there is a problem that the number of parts is large, the material cost and the man-hour for management are large. Further, it is necessary to fix the connector to the nylon tube in advance, and the man-hour has been increased. SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to eliminate the need for a connector and to enable one-touch connection with a mating member while maintaining the sealing and retaining properties of the hose itself. And A hose having a joint according to the present invention comprises a resin hose body and a ring-shaped bulge formed by processing the hose body at one end of the hose body. And a plate that protrudes radially inward from the tube wall of the hose body and is inclined with respect to the axial direction so that the protruding amount becomes greater toward the back.
Joint having a hook-shaped locking projection and covering the surface of the joint
A second layer, comprising a seal ring on the inner periphery of the bulging portion, inserting a mating member into the joint portion, and pressing the seal ring against the outer peripheral surface of the mating member and the inner peripheral surface of the bulging portion. In addition to sealing, the locking projection is configured to be engaged with a projection provided on the outer peripheral surface of the mating member so as to be prevented from falling off. In the hose having the joint according to the present invention, a mating member is inserted into the joint. Then, by inserting the mating member deeper than the position of the seal ring, the seal ring is pressed against the outer peripheral surface of the mating member and the inner peripheral surface of the bulging portion, and a high sealing structure is obtained. And, on the convex portion provided on the outer peripheral surface of the mating member,
By engaging the locking projection so as to regulate the movement of the mating member in the pulling direction, the movement of the mating member in the direction in which the mating member comes off from the hose is regulated. When the mating member is removed from the hose, the engagement between the locking projection and the projection is released by a jig or the like.
The mating member can be easily pulled out. Hereinafter, the present invention will be described more specifically with reference examples and examples. In the present reference example and examples, the present invention is applied to a fuel supply hose of an automobile. ( Reference Example 1 ) FIG. 1 shows a hose of this reference example together with a pipe to be inserted and connected. The hose includes a hose body 1 and a joint 10 formed by processing an end of the hose body 1. The hose body 1 is made of a nylon tube having a flexural modulus of 1000 or more, and is formed by extrusion. If the flexural modulus is smaller than 1000, the strength of the joint portion 10 is reduced and the pipe 2 is easily pulled out, which is not preferable. The joint portion 10 has a first enlarged diameter portion 11 larger than the diameter of the hose body 1 and a first enlarged diameter portion 11 formed at the tip of the first enlarged diameter portion 11.
A second enlarged diameter portion 12 having a larger diameter than the enlarged diameter portion; and a ring-shaped bulging portion 13 formed at an intermediate portion of the first enlarged diameter portion 11.
And a plurality of locking projections 14 arranged in the second enlarged diameter portion 12 at intervals in the circumferential direction and projecting radially inward. The joint 10 is formed by extruding the hose main body 1, cutting the hose into a fixed length, placing the end of the hose main body in a mold, and performing blow molding. In addition,
Only the plurality of locking projections 14 are formed by punching after blow molding, and the locking projections 14 are formed so as to be inclined with respect to the axial direction such that the amount of protrusion inward in the radial direction increases toward the back. The metal pipe 2 shown in FIG. 1 is connected to the joint 10. The pipe 2 has a bulge portion 20 formed at a position away from the distal end by a predetermined distance. Then, the pipe 2 is inserted into the joint portion 10 deeper than the bulge portion 20 and joined, and the dimensional relationship between the two is as follows. First, the inner diameter of the first enlarged diameter portion 11 is substantially equal to the general outer diameter of the pipe 2. The second enlarged diameter portion 1
The inner diameter of the pipe 2 is substantially equal to the outer diameter of the bulge portion 20 of the pipe 2. The distance from the inner surface of the boundary between the first enlarged diameter portion 11 and the second enlarged diameter portion 12 to the tip of the locking projection 12 is equal to the bulge portion 20.
Is configured to be substantially equal to the width of. In the bulging portion 13, a first seal ring 30 and a ring-shaped partition member 31 are sequentially arranged from the hose body 1 side.
And the second seal ring 32 are arranged side by side in the axial direction. The inner diameter of the first seal ring 30 and the second seal ring 32 is smaller than the general outer diameter of the pipe 2 under no load, and the inner diameter of the partition member 31 is substantially the same as the general outer diameter of the pipe 2. In order to connect the pipe 2 to the joint 10, the pipe 2 is inserted into the opening of the second enlarged diameter portion 12 from the tip. The pipe 2 moves forward while increasing the inner diameters of the first seal ring 30 and the second seal ring 32, and is inserted by the bulge portion 20 riding over the locking projection 14 and abutting on the end surface 15 of the first enlarged portion 11. Is regulated. In this state, as shown in FIG. 2, since the locking projection 14 has restored its original shape by its own elastic force after climbing over the bulge section 20, the bulge section 20 is located between the end face 15 and the locking projection 14. As a result, the pipe 2 is held in the axial direction, and the relative movement of the pipe 2 in the axial direction with respect to the hose body 1 is restricted. In this state, the first seal ring 30
The second seal ring 32 is pressed into contact with the inner peripheral surface of the bulging portion 13 and the outer peripheral surface of the pipe 2, thereby ensuring the sealing between the hose body 1 and the pipe 2. That is, in the hose having the joint according to the present embodiment, the pipe 2 can be joined by one-touch only by inserting the pipe 2 into the joint 10. Since a connector as a separate component is not required as in the related art, the weight can be reduced and the cost can be reduced by reducing the number of components and the number of assembly steps. When the pipe 2 is detached from the joint 10 of the hose of the present embodiment , a half-split cylindrical jig 4 as shown in FIG. It is inserted between the outer peripheral surfaces of the pipe 2. As a result, the locking projection 14 is pressed outward in the radial direction to expand its diameter, so that the engagement with the bulge portion 20 is released and the pipe 2 can be pulled out from the joint portion 10. ( Embodiment 1 ) FIG. 4 shows a hose having a joint according to this embodiment . This hose has a reference except that the joint 50 has a two-layer structure.
The same as in the first embodiment . In this hose, the joint portion 50 is composed of a first layer 51 continuous from the hose body 5 and a second layer 52 coated on the surface of the first layer 51. The first layer 51 is a reference example.
The structure is the same as that of the first joint portion 10. And the first layer 51
The second layer 52 of the same material as that of the first layer 51 covers the entire first layer 51. Therefore, in the present embodiment, the strength of the joint portion 50 is improved as compared with the first embodiment. The hose of the present embodiment can be easily manufactured by coating a heat-shrinkable tube on the end of the hose after forming the first layer 51 and heating the tube in a heating tank. ( Reference Example 2 ) A hose having a joint portion of Reference Example 2 is shown in FIG. 5 together with an inserted pipe. This hose has a hose body 6
And a joint 60 formed by processing the tip of the hose body 6. The joint portion 60 includes a first enlarged diameter portion 61, a second enlarged diameter portion 62 formed at the end of the first enlarged diameter portion and having a diameter larger than the first enlarged diameter portion 61, and a first enlarged diameter portion 61. to a pair of ring-shaped bulging portion 63 formed, the distal end of the second enlarged diameter portion 62 and the locking projection 64 which is bent inward in cross section hooked, except that consist of the same manner as in reference example 1 Configuration. This joint 60
The pipe 7 is inserted from the distal end of the second enlarged-diameter portion 62, and a pair of seal rings 8 held by the bulging portion 63 are pressed against and sealed to the pipe 7. The bulge portion 70 of the pipe 7 is inserted while expanding the diameter of the locking projection 64, and
When the locking projection 64 is restored to the original shape in a state where the pipe 7 is located inside the pipe 2, the locking projection 64 is engaged with the bulge portion 70 and the pipe 7 is prevented from coming off. In this embodiment , the locking projections 64 are formed in a ring shape. However, as shown in FIG. 6, a plurality of locking projections 64 are formed at intervals in the circumferential direction by forming radial slits 65 as shown in FIG. It can also be. This facilitates elastic deformation of the locking projection 64 and facilitates insertion of the pipe 7. According to the hose having the joint portion of the present invention, the hose can be attached and detached with a single touch like the hose to which the conventional connector is connected, and the connector is unnecessary, so that the weight is reduced. Cost reduction can be achieved by reducing the number of parts and the number of connector assembly steps.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a hose having a joint according to a reference example of the present invention together with a pipe. FIG. 2 is a cross-sectional view showing a state in which a hose having a joint according to a reference example of the present invention is connected to a pipe. FIG. 3 is an explanatory sectional view showing a method of removing a pipe from a hose having a joint according to one embodiment of the present invention. FIG. 4 is a sectional view of a hose having a joint according to an embodiment of the present invention. It is sectional drawing which shows a state. 5 is a cross-sectional view showing a coupling state of the pipe a hose with a joint portion of the second reference example of the present invention. FIG. 6 is a side view of a hose having the joint shown in FIG. 5; FIG. 7 is a cross-sectional view showing a state in which a hose having a conventional joint is connected to a pipe. [Explanation of Signs] 1: Hose body 2: Pipe (partner member)
4: jig 10: joint 13: bulge
14: locking projection 20: bulge portion (convex portion) 30: first seal ring
32: Second seal ring

Claims (1)

(1) A resin hose main body , a ring-shaped bulge formed by processing the hose main body at one end of the hose main body, and a tube of the hose main body. wall
A joint portion having a plate-shaped locking projection that projects radially inward from the inner side and that is inclined with respect to the axial direction so that the projection amount becomes greater toward the back, and a second layer that covers the surface of the joint portion. A seal ring is held on the inner periphery of the bulging portion, a mating member is inserted into the joint portion, and the seal ring is pressed against the outer peripheral surface of the mating member and the inner peripheral surface of the bulging portion to seal. A hose having a joint portion, wherein the locking projection is configured to be engaged with a projection provided on an outer peripheral surface of the counterpart member to prevent the projection from coming off.