JP3695246B2 - Branch connection pipe and its manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch connection pipe that guides a fluid flowing through a passage of a main hose from the passage to the outside at a branch point, and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, as this kind of branch connection pipe, for example, the one shown in FIG. 17 is known. As shown in the cross-sectional view of FIG. 17, a sub hose 230 is branched and connected from the main hose 220 using a branch pipe main body 250. In FIG. 17, the secondary hose 230 is connected to the main hose 220 via the branch pipe body 250 and the rubber molding portion 260. That is, a branch port 225 is formed in the main hose 220, and one end portion of the branch pipe body 250 is inserted into the branch port 225 and covered with the rubber molding portion 260, so that the main hose 220 and the sub hose 230 are connected. It is connected. In this configuration, a flange portion 252 is provided at the lower end portion of the branch pipe main body 250, and the flange portion 252 prevents the branch pipe main body 250 from coming off the main hose 220.
[0003]
[Problems to be solved by the invention]
However, in the conventional branch connection pipe, since the branch pipe main body 250 is generally made of resin, a gap is easily generated between the root portion of the branch pipe main body 250 protruding into the passage 221a and the inner peripheral wall surface of the passage 221a. Since the root portion of the branch pipe body 250 is constantly exposed to the fluid, peeling is likely to occur at the joint end portion between the main hose 220 and the branch pipe body 250. For this reason, there is a problem that the fluid flowing through the passage 221a enters from the separated gap and the joining state between the main hose 220 and the branch pipe main body 250 is easily impaired.
[0004]
An object of the present invention is to solve the above-described problems of the prior art, and to provide a branch connection pipe capable of maintaining a high bonding force with respect to a main hose.
[0005]
[Means for solving the problems and their functions and effects]
In order to solve such a problem, the first branch connection pipe of the present invention includes:
A branch connection pipe for guiding fluid flowing through a passage of a main hose made of a rubber material to the outside from the passage at a branch point;
A branch connection portion that forms a branch passage for guiding the fluid to the outside in communication with the passage;
The branch connection is
A branch passage first forming portion extending along an inner peripheral wall of the main hose so as to form an end portion of the branch passage in the passage of the main hose;
A branch passage second forming portion having a flange located at a distance from an outer peripheral wall of the main hose, and forming a tip portion of the branch passage outside the main hose;
A branch passage third forming portion that forms the branch passage between the branch passage end portion of the branch passage first forming portion and the branch passage tip portion of the branch passage second forming portion;
The branch portion of the main hose has a covering portion formed on the outer peripheral wall of the main hose so as to cover the flange,
The branch passage first forming portion, the branch passage third forming portion, and the covering portion are formed of a rubber material that can be integrated by vulcanization,
The branch passage first forming portion is in close contact with the inner peripheral wall of the main hose by a vulcanization process at a portion extending along the inner peripheral wall of the main hose.
It is characterized by that.
[0006]
In the branch connection pipe of the present invention having the above-described configuration, a branch passage for guiding fluid from the passage of the main hose to the outside is formed by the first to third branch passage forming portions of the branch connection portion, and this branch passage is formed. Communicate with the aisle. Then, the flange of the branch passage second forming portion is disposed with a gap from the main hose outer peripheral wall, and this flange is covered with the covering portion from the main hose outer peripheral wall side. Thereby, since the flange is embedded in the covering portion, the branch passage second forming portion is secured to the covering portion by this flange.
[0007]
  On the other hand, the branch passage first forming portion extending along the inner peripheral wall in the main hose passage is integrated with the coating portion by vulcanization with the branch passage third forming portion interposed therebetween. Thereby, the branch connection part which formed the branch passage becomes a branch connection pipe united with the main hose. Since this integration is by vulcanization of rubber materials, separation of the branch passage first forming portion, the branch passage third forming portion, and the covering portion is unlikely to occur. Since the outer wall-side covering portion and the inner wall-side branch passage first forming portion are integrated with the main hose peripheral wall in between, the branch passage first is prevented from being removed from the covering portion as well as the covering portion. 2 formation part is stopped with respect to the main hose. Moreover, the close contact between the branch passage first forming portion and the main hose at the portion extending along the inner peripheral wall in the main hose passage is close contact by the vulcanization treatment and close contact of the rubber material which is a homogeneous material. Therefore, even if this close contact portion is constantly exposed to the fluid, peeling at the close contact portion is difficult to occur, so that it is possible to maintain a high bonding force with respect to the main hose in combination with the above-described preventing action of each portion.. In addition, the first passage forming portion of the branch passage has a tapered inclined surface having a large diameter on the side of the inner peripheral wall of the main hose, so that the resistance of the fluid flowing through the passage at a portion extending along the inner peripheral wall in the main hose passage And the fluid flow in the main hose passage is not hindered.
[0008]
Here, as a preferred aspect of the branch connection portion, the covering portion may be formed so as to cover the entire circumference of the outer peripheral wall of the main hose at the branch point.
In this way, even if the internal pressure is increased due to the fluid branch flow at the branch location of the main hose and the stress for expanding the hose diameter is increased, the expansion of the hose diameter can be suppressed by the covering portion around the outer wall of the main hose.
[0010]
The branch connection pipe manufacturing method of the present invention comprises:
A method of manufacturing a branch connection pipe for guiding fluid flowing through a passage of a main hose made of a rubber material to the outside from the passage at a branch point,
A step of preparing a main hose with a branch opening in the peripheral wall of the hose;
Inserting a first core material having a concave portion formed larger in diameter than the branch port into the outer periphery of the main hose, and setting the first core material so that the concave portion overlaps the branch port;
A lump of unvulcanized or unvulcanized rubber material is inserted from the branch port, and the inserted lump is expanded and deformed so as to follow the shape of the recess, and is expanded to the peripheral edge of the branch port. Interposing the mass after deformation; and
Providing a branch passage tip portion forming member having a flange and forming a tip portion of the branch passage for guiding the fluid to the outside outside the main hose;
A mold setting step of setting the main hose on which the first core material has been set and the lump has been interposed, and the branch passage tip portion forming member in a mold; A second core material inserted at the tip of the branch passage is disposed through the branch port, and a cavity surrounding the flange and the gap is positioned at a distance from the outer peripheral wall of the hose. The mold setting step to be formed at the branch point of the hose;
And a step of performing a rubber material injection into the cavity and a subsequent vulcanization process.
It is characterized by that.
[0011]
According to the manufacturing method of the present invention having the above-described configuration, the branch connecting pipe of the present invention can be easily manufactured as described below.
[0012]
When the rubber material is injected into the cavity of the mold in which the main hose and the branch passage tip portion forming member are set, the cavity is filled with the rubber material. Therefore, the flange of the branch passage tip portion forming member is covered with the above-mentioned filled rubber material from the main hose outer peripheral wall side with a gap from the main hose outer peripheral wall. That is, the branch passage tip portion forming member becomes the branch passage second forming portion in the above-described branch connection pipe of the present invention, and the rubber material of the portion covering this from the main hose outer peripheral wall side becomes the covering portion.
[0013]
In addition, the injected rubber material reaches a lump that has been inserted into the main hose from the lower end of the flange of the branch passage tip portion forming member around the second core material inserted into the branch passage tip portion of the branch passage tip portion forming member. It fills up to the area (second core material surrounding area). At this time, the rubber material reaches the gap between the branch port of the main hose and the second core material and fills this gap. As a result, the mass that has been expanded and deformed following the concave shape of the first core material in the main hose passage interposes the rubber material in the portion surrounding the second core material at the lower end of the flange, and the flange is mainly used. Continuing with the rubber material (covering part) of the part covered from the hose outer peripheral wall side That is, the portion of the rubber material filled in the region surrounding the second core material becomes the third branch passage formation portion in the above-described branch connection pipe of the present invention, and is expanded and deformed following the concave shape of the first core material in the main hose passage. The lump is the branch passage first forming portion. Then, after vulcanization after injecting the rubber material, the rubber material filled in each part and the lump are integrated as described above, and this lump is vulcanized and adhered to the inner peripheral wall of the main hose of the rubber material. Thereafter, the branch connection pipe of the present invention is obtained by releasing the mold and removing the core material, and the second core material forms a branch passage that follows the branch passage tip portion of the branch passage tip portion forming member. If the branch passage following the branch passage tip portion of the branch passage tip forming member does not penetrate the lump, a through hole is made in the lump by a process such as punching, and this is used as the end of the branch passage. Good.
[0014]
Here, as a preferred embodiment, the mold setting step may form the cavity around the outer peripheral wall of the main hose over the entire circumference at the branch point.
If it carries out like this, the branch connection pipe which has a coating | coated part over the main hose outer peripheral wall periphery can be manufactured in a branch location.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.
[0016]
FIG. 1 is a perspective view of a main part of a branch connection pipe according to an embodiment of the present invention, and is a perspective view showing a branch point of a main hose 20 connecting an automobile engine and a radiator (not shown). 2 is a cross-sectional end view of the hose branching section cut along line 2-2 in FIG. 1, and FIG. 3 is a cross-sectional end view of the hose branching section cut along the hose longitudinal direction.
[0017]
As shown in FIG. 1, the branch connection pipe BK of this embodiment includes a branch connection of a main hose 20 to a sub hose 30 via a branch connection portion 40 at a branch point of the main hose 20. The main hose 20 is connected to the lower part of the radiator at one end and connected to the engine at the other end. The sub hose 30 is connected to the reservoir at the other end.
[0018]
As shown in FIGS. 2 and 3, the main hose 20 includes an inner tube layer 21 and an outer tube layer 22 made of an EPDM rubber material, and a main passage 21a through which a cooling medium flows. A thread layer 23 is interposed between the inner tube layer 21 and the outer tube layer 22 to reinforce the main hose 20. A branch port 25 is opened at a branch point of the main hose 20.
[0019]
The auxiliary hose 30 has substantially the same configuration as the main hose 20 except that the diameter is 1/3 to 1/2 that of the main hose 20. That is, even in the secondary hose 30, it is formed of an EPDM rubber material, and the inner tube layer 31, the outer tube layer 32, and the thread layer 33 are laminated, and the inner tube layer 31 is used as the sub passage 31a.
[0020]
The branch connection portion 40 for connecting the main hose 20 and the sub hose 30 includes a branch pipe main body 42 located outside the main hose 20, an in-pipe annular body 44 located in the main passage 21a, and a branch portion covering body 46. With. And this branch connection part 40 is provided with the hole which penetrates each of these members as the branch channel | path 41 for guide | inducing the fluid (cooling medium) outside from the main channel | path 21a.
[0021]
The branch pipe main body 42 is formed in a tubular shape with a resin material, and the central through hole 42a serves as a tip end portion 41a of the branch passage 41 outside the main hose. The lower end of the branch pipe main body 42 is a flange 42b positioned with a gap from the outer wall of the main hose, and the upper end of the branch pipe main body 42 is connected to a connection end 42c bulged to prevent the sub hose 30 from being pulled out. Has been.
[0022]
The in-pipe annular body 44 is an EPDM rubber material product that has been vulcanized in the branch pipe manufacturing process, and has a curved disk shape that spreads along the inner peripheral wall of the main passage 21a. This in-pipe annular body 44 has a through hole 44a in the center, and this through hole 44a serves as a terminal portion 41b of the branch passage 41 in the main passage 21a. As shown in the figure, the peripheral portion of the annular inner body 44 is a tapered inclined surface 44b having a large diameter on the inner peripheral wall side of the main passage 21a.
[0023]
The branch cover 46 is formed on the outer peripheral wall of the main hose 20 by vulcanizing the EPDM rubber material injected into the mold cavity during the branch pipe manufacturing process. This branch portion covering body 46 includes a flange covering portion 46a that covers the flange 42b from the outside and a flange lower end region portion 46b that fills the gap at the lower end of the flange. The flange lower end region portion 46b is joined and integrated with the in-pipe annular body 44. ing. The flange lower end region portion 46b fills the periphery of the branch port 25 of the main hose 20, and the branch passage 41 extends from the end portion 41b of the inner annular body 44 to the tip end portion 41a of the branch tube main body 42 through the through hole 46c. Intermediate portion 41c.
[0024]
Next, the manufacturing method of a branch connection pipe is demonstrated. 4 to 10 are explanatory views for explaining a series of manufacturing steps of the branch connection pipe. As shown in FIG. 4, first, an unvulcanized hose extrudate 20 </ b> A for forming the main hose 20 is manufactured, and a hose extrudate 30 </ b> A for forming the auxiliary hose 30 is manufactured. The hose extrudates 20A and 30A are manufactured by a normal method, that is, by spirally winding reinforcing yarns for forming the yarn layers 23 and 33 while extruding a rubber material by an extruder. Here, as the shapes of the hose extrudates 20A and 30A, for example, the inner diameter D1 of the hose extrudate 20A is 30 to 37 mm, the thickness t1 is 4.5 mm, and the inner diameter D2 of the hose extrudate 30A is 5.8 to 16 mm. can do.
[0025]
Subsequently, the hose extrudate 20A is vulcanized and simultaneously brazed into a predetermined shape. 5 and 6 are diagrams for explaining the vulcanization process and the brazing process. The brazing and vulcanization steps are performed using a mandrel MD and a vulcanizer (not shown). The mandrel MD is a rod having the same thickness as the inner diameter D1 of the hose extrudate 20A, and is bent into a predetermined shape. In this step, the hose extrudate 20A is pushed into the mandrel MD, and then loaded into a vulcanizer, and vulcanized under vulcanization conditions at 150 ° C. for 30 minutes to form the main hose 20. When the main hose 20 is pulled out of the mandrel MD, the main hose 20 brazed according to the bent shape of the mandrel MD is obtained. Then, as shown in FIG. 6, the branch port 25 is formed in the branch location of the main hose 20 with a drill Dr or the like.
[0026]
Next, the process of connecting the sub hose 30 to the main hose 20 via the branch pipe main body 42 (refer FIG. 2, FIG. 3) is performed. Here, the branch pipe main body 42 is previously formed by injection molding. 7 and 8 are explanatory views for explaining the first center setting step for the main hose 20 and the step for setting the in-hose forming mass 48 to be the ring-in-tube annular body 44 after the completion of the manufacturing process. FIGS. 7A and 8A are explanatory diagrams for explaining a state along the longitudinal direction of the hose. FIG. 7B and FIG. 8B are explanatory views for explaining a state from the cross-sectional direction of the hose.
[0027]
As shown in these drawings, the first core 61 is composed of a first core upper half 61a and a first core lower half 61b which are divided into upper and lower parts, and the insertion point to the hose is the main hose. A cylindrical shape having substantially the same outer diameter as the inner diameter D1 of 20 is formed, and an end portion is an expansion base 61c. Further, the first core 61 has a recess 62 formed on the top outer peripheral portion of the first core upper half 61 a so as to have a larger diameter than the branch port 25 of the main hose 20. The recess 62 has a recessed shape that is curved along the outer periphery of the first core upper half 61a, and the recessed peripheral edge 62a is a tapered inclined surface having a large diameter on the outer peripheral side. An air vent hole 62b is formed at an appropriate location in the concave portion 62, so that air in the concave portion is discharged through the air vent hole 62b and the through hole 61d in the center of the core when the annular body forming block 48 is press-fitted. Has been. The first core 61 is inserted into the main hose 20 from the front end side of the cylindrical portion, and the main hose 20 is attached to the first core 61. At this time, the concave portion 62 and the branch port 25 overlap substantially concentrically.
[0028]
Subsequently, the annular body forming lump 48 is loaded into the recess 62 from the outside of the hose. The mass 48 for forming an annular body is a cylindrical body having substantially the same diameter as that of the branch port 25, and is formed of an unvulcanized EDPM rubber material. When loading the annular body forming block 48, the main hose 20 with the first core 61 already set is held in a so-called V block 63, and the insertion jig 64 is set on the main hose 20. The insertion jig 64 has a cylindrical portion 64 a continuous to the branch port 25, and the cylindrical portion 64 a serves as a guide for loading the mass 48 for forming an annular body. Following such jig setting, the annular body forming block 48 is put into the cylindrical portion 64a of the insertion jig 64, and the piston 65 is lowered in the cylindrical portion 64a by an air cylinder, a hydraulic cylinder or the like. Thereby, the annular body forming lump 48 is pushed by the piston and loaded into the recess 62 from the branch port 25. In the state where the piston 65 is lowered to the stroke end, as shown in FIG. 8, the annular body forming lump 48 is expanded and deformed following the depressed shape of the recess 62, spreads to each part of the recess 62, and has a branch port. Fill the 25 peripheral areas. Next, the piston 65 is raised, and the insertion jig and the V block are removed. Even when the piston 65 is removed, the annular body forming lump 48 remains in the recess 62 while being expanded and deformed following the depressed shape of the recess 62. Prior to filling of the annular body forming block 48, a treatment such as polishing (roughening and removing dirt on the surface) of the outer peripheral wall of the main hose at the peripheral wall of the branch port 25 or the peripheral edge of the branch port 25 is performed. It is preferable to improve the vulcanization adhesion.
[0029]
Subsequently, as shown in FIG. 9, the cylindrical portion 71 a of the second core 71 is inserted into the through hole 42 a of the branch pipe main body 42, and the branch pipe main body 42 is positioned and mounted on the second core 71. And an adhesive agent is apply | coated to the outer surface part area | region of the branch pipe main body 42 including the upper and lower surfaces of the flange 42b. This adhesive acts to increase the adhesive force between the branch pipe main body 42 and the branch portion covering body 46.
[0030]
Subsequently, as shown in FIG. 10, a step of setting the main hose 20 supported by the first core 61, the branch pipe body 42 supported by the second core 71, and the like on the mold 80 is performed. That is, the main hose 20 is set in the mold 80 via the first core 61 and the second core is in a state where the tip 71c of the second core 71 is inserted into the branch port 25 of the main hose 20. 71 is set in the mold 80. At this time, the connecting end 42c of the branch pipe main body 42 is fitted and supported in the recess 80a of the mold 80, and the flange 42b of the branch pipe main body 42 is positioned with a gap from the outer peripheral wall of the main hose 20. Also, the annular body forming block 48 in the recess 62 is pressed by the tip 71 c of the second core 71. A through hole may be formed in the annular body forming lump 48 when the annular body forming lump 48 is pressed at the tip 71c. By the above-described setting process, a cavity 83 surrounding the flange 42 b and the flange lower end region of the branch pipe main body 42 and the branch port 25 is formed in the mold 80 on the outer peripheral wall side of the main hose 20.
[0031]
In the next step, after the mold 80 is clamped, rubber injection molding is performed. That is, a rubber material is injected into the cavity 83 from an injection molding machine (not shown). Thereafter, press vulcanization is performed to vulcanize the rubber material in the cavity 83 by heating the mold 80. As vulcanization conditions, 20 minutes can be taken at 160 ° C. As a result, the rubber material of the cavity 83 and the mass 48 for forming the annular body of the recess 62 are vulcanized and integrated into a branch portion covering body 46 and an in-pipe annular body 44. Then, after the mold 80 is opened, the first intermediate core 61 and the second intermediate core 71 are removed, whereby the branch pipe main body 42 is integrated with the branch portion covering body 46 and the pipe annular body 44. The main hose 20 having 40 is completed. When removing the first core 61, the first core lower half 61b is removed first, and then the first core upper half 61a is removed. If it carries out like this, the 1st core upper half part 61a can be easily removed in the state which released | separated the annular body 44 from the recessed part 62. FIG. If the first core 61 is not vertically divided, the main hose 20 is slightly expanded by blowing air into the recess 62 through the air vent hole 62b. What is necessary is just to remove 61.
[0032]
If the through-hole is not made in the annular body forming block 48 when the second core 71 is set, the die is removed and then inserted into the through-hole 42a of the branch pipe body 42 with the punched shaft, A through hole 44 a (the end portion 41 b of the branch passage 41) may be formed in the body 44.
[0033]
According to the branch connecting pipe according to the above embodiment, the branch passage 41 from the main hose 20 to the sub hose 30 is connected to the pipe annular body 44, the flange lower end region 46b of the branch cover 46 and the branch pipe main body 42. Each through hole is formed. Then, the pipe annular body 44 and the branch portion covering body 46 were integrated by vulcanization, and the branch pipe main body 42 was vulcanized and bonded to the branch portion covering body 46 with the flange 42b embedded therein. Therefore, the branch passage 41 becomes a continuous hole from the front end to the end, and fluid leakage can be reliably prevented.
[0034]
Further, the flange 42 of the branch pipe main body 42 is separated from the outer peripheral wall of the main hose 20 and is covered from the outside with the branch portion covering body 46. Therefore, the flange 42 b embedded in the branch portion covering body 46 thus reliably prevents the branch pipe body 42 from being removed from the branch portion covering body 46. In addition, this branch portion covering body 46 is integrated with the curved disk-shaped annular annular body 44 that spreads around the periphery of the branch port 25 in the main passage 21a through vulcanization, and the annular annular body 44 is connected to the main hose 20. Vulcanized and bonded to the inner wall of the main passage 21a. Therefore, separation of the branch portion covering body 46 and the pipe inner annular body 44 and separation of the pipe inner annular body 44 from the inner wall of the main passage 21a are less likely to occur, and the branch connection portion 40 can be fixed to the main hose 20 with a high bonding force. , Dropping off from the main hose 20 can be reliably prevented.
[0035]
Further, in the pipe annular body 44 existing in the main passage 21a of the main hose 20, the peripheral edge thereof is a tapered slope 44b having a large diameter on the side of the passage inner peripheral wall. Therefore, the resistance when the fluid (cooling medium) passing through the main hose 20 flows through the main passage 21a can be reduced, and the fluid flow in the main passage 21a is not hindered.
[0036]
In addition, the taper slope 44b makes it difficult for the tubular annular body 44 to be peeled off, so that fluid intrusion into the yarn layer 23 due to the peeling can be suppressed. In addition, since the pipe annular body 44 is joined (vulcanized and bonded) with a wide area along the inner wall surface of the main passage 21a at the periphery of the branch port 25, fluid intrusion into the yarn layer 23 can be prevented more reliably.
[0037]
The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.
[0038]
(1) FIG. 11 is a cross-sectional view showing a branch connection pipe BKA according to the second embodiment, and FIG. 12 is an explanatory view for explaining a mold setting state at the time of manufacturing the branch connection pipe BKA. In FIG. 11, the branch connection pipe BKA of this embodiment is replaced with the above-described branch portion covering body 46, and a branch portion covering body 46 </ b> A having a main hose covering portion 46 d in addition to the flange covering portion 46 a and the flange lower end region portion 46 b. Have Since the main hose 20 is covered around the outer peripheral wall at the branch point by the main hose covering portion 46d, expansion of the main hose 20 can be suppressed even if the internal pressure increases at the branch point.
In the manufacture of such a branch connection pipe BKA, the cavity 83 formed by a mold is formed to the periphery of the outer wall of the main hose 20 as shown in FIG.
[0039]
(2) FIG. 13 is a schematic perspective view showing an annular body forming lump 48 according to a modification. As shown in the drawing, in the annular body forming lump 48 of the modified example, slits 48a are formed at equal intervals on the lower end side thereof. Since the lower end side of the annular body forming lump 48 of this modified example easily spreads around the slit 48 a as a boundary, the annular body forming lump 48 is placed in the recess 62 of the first core 61 with a small force. Easy to load.
It should be noted that the annular body forming lump 48 of this modified example or the above-described embodiment may be a cylindrical one having a through hole in the center. If it carries out like this, it will become easy to spread only by the part which a through-hole exists, and the loading to the recessed part 62 will become easy.
[0040]
(3) FIG. 14 is a sectional end view showing a branch connection pipe BKB according to the third embodiment. This embodiment is characterized in that the hose end portion 130a of the branch hose 130 corresponding to the sub hose 30 has a flange shape (flared shape), and the hose end portion 130a is embedded in the branch portion covering body 146. are doing. That is, an in-pipe annular body 144 is tightly formed in the hose passage at the branch port 125 of the main hose 120, and this in-pipe annular body 144 is formed to cover the flange-like hose end portion 130a from the outside. It is integrated with the body 146 through vulcanization. In this branch connection pipe BKB, the flange-like hose end portion 130 a performs the same function as the flange 42 b in the branch pipe main body 42, and the branch hose 130 is securely stopped and fixed to the main hose 120. Note that the branch passage 141 in the branch connection pipe BKB is formed by an end pipe line portion of the in-pipe annular body 144, the branch portion covering body 146, and the branch hose 130.
[0041]
(4) FIG. 15 is an explanatory view showing the flange portions of the branch pipe main bodies 150A, 150B, and 150C that replace the branch pipe main body. That is, the flange portion 152A of FIG. 15A is formed in a disc shape, and through holes 152Aa are formed in four directions thereof. The through hole 152Aa has an effect of enhancing the integrity with the branch portion covering body 46 and preventing the periphery of the branch pipe main body 150A. 15B, the flange portion 152B may be formed in a gear shape, or the flange portion 153C may be formed in a square plate shape as shown in FIG. .
[0042]
(5) The rubber material for forming the annular body forming mass 48 (see FIGS. 7, 8, and 13) to be the tubular annular bodies 44, 144 shown in FIG. 2 and the like is not vulcanized but also vulcanized. Incomplete, specifically semi-vulcanized. By using such a semi-vulcanized rubber material, it is possible to stably expand and deform following the depressed shape of the recess 62.
[0043]
(6) FIG. 16 is a sectional end view showing the vicinity of a branch connection portion 40D according to another embodiment. The present embodiment is characterized in that the branch passage 41 from the branch pipe main body 142 to the in-pipe annular body 44 can be closed by the plug 60D when the secondary hose is not connected to the branch connection portion 40D. In FIG. 16, a female screw 143 is formed on the inner wall surface of the branch passage 41 in the branch pipe main body 142. Moreover, said 1 plug 60D is a member which closes the branch channel | path 41, and is integrally formed from head 61Da, external thread part 61Db, and sealing part 61Dc. In this case, the male screw portion 61Db can be screwed into the female screw 143 in a watertight manner. The outer diameter d1 of the sealing portion 61Dc is slightly larger than the flange lower end region 46b of the branch covering body 46 and the inner diameter d2 of the branch passage 41 in the pipe annular body 44.
[0044]
In the above configuration, when the male screw portion 61Db of the plug 60D is screwed into the female screw 143 of the branch tube main body 142, the branch passage 41 of the branch pipe main body 42D is sealed by the male screw portion 61Db and the sealing portion 61Dc of the plug 60D. Is done. Thus, by forming the female screw 143 on the inner surface of the branch passage 41 of the branch pipe main body 42D, the branch passage 41 can be sealed by the plug 60D when the secondary hose is not connected. In the branch pipe body 142, a female screw 143 is formed in advance at the time of injection molding.
[0045]
Further, since the outer diameter d1 of the sealing portion 61Dc of the plug 60D is formed larger than the inner diameter d2 of the branch passage 41 as described above, when the plug 60D is attached to the branch pipe body 42D, the sealing portion 61Dc. Presses the branch covering 46. Therefore, high sealing performance can be obtained without using a sealing member such as an O-ring.
[0046]
The plug 60D in FIG. 16 is configured as a sealing member that is screwed to the branch pipe main body 142 to completely close the branch passage 41. However, the present invention is not limited to this, and a communication hole for air or water drainage is formed. The main passage 21a may be configured as a member for communicating with the outside. Further, the plug 60D can be used as a member for mounting the water temperature sensor in the main passage 21a of the main hose 20, assuming that the water temperature sensor penetrates the plug 60D.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a branch portion of a main hose 20 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional end view of a hose branch portion taken along line 2-2 in FIG.
FIG. 3 is a cross-sectional end view in which a hose branch portion is cut along a hose longitudinal direction.
FIG. 4 is an explanatory diagram for explaining a process for manufacturing a main hose 20;
FIG. 5 is an explanatory diagram illustrating a process of setting the hose extrudate 20A to the mandrel MD.
FIG. 6 is an explanatory diagram for explaining a process of forming a branch port 25 with a drill Dr or the like in the branch protrusion 26 of the main hose 20;
7 is an explanatory diagram for explaining a first center setting step for the main hose 20 and a step for setting the in-hose forming mass 48 to be the ring-in-tube annular body 44 after the completion of the manufacturing process; FIG. (A) is explanatory drawing explaining the mode along the hose longitudinal direction before loading the annular body formation lump 48, FIG.7 (b) is explanatory drawing explaining the mode from a hose cross-section direction.
8 is an explanatory diagram for explaining a first center setting step for the main hose 20 and a step for setting the in-hose forming mass 48 to be the ring-in-tube annular body 44 after the completion of the manufacturing process; FIG. (A) is explanatory drawing explaining a mode along the hose longitudinal direction at the time of the annular body formation lump 48 loading, FIG.8 (b) is explanatory drawing explaining the mode from a hose cross-sectional direction.
FIG. 9 is an explanatory diagram for explaining a process of positioning and setting the branch pipe main body on the second core 71;
10 is a cross-sectional view showing a state where the main hose 20 and the like are set in a mold 80. FIG.
FIG. 11 is a cross-sectional view showing a branch connection pipe BKA according to a second embodiment.
FIG. 12 is an explanatory diagram for explaining a mold setting state at the time of manufacturing this branch connection pipe BKA.
FIG. 13 is a schematic perspective view showing an annular body forming lump 48 according to a modification.
FIG. 14 is a sectional end view showing a branch connection pipe BKB according to a third embodiment.
FIG. 15 is an explanatory view for explaining a modification of the flange portion 152A and the like of the branch pipe main body.
FIG. 16 is a cross-sectional view showing a peripheral portion of a branch connection portion 40D according to still another embodiment.
FIG. 17 is a cross-sectional view showing a branch connection pipe according to a conventional technique.
[Explanation of symbols]
20 ... Main hose
20A, 30A ... hose extrudate
21 ... Inner tube layer
21a ... Main passage
22 ... Outer tube layer
23, 33 ... Yarn layer
25 ... Branch
26: Branch protrusion
30 ... Sub hose
31 ... Inner tube layer
31a ... Secondary passage
32 ... Outer tube layer
40 ... Branch connection
40D ... Branch connection
41 ... Branch passage
41a ... tip portion
41b ... Terminal part
41c ... middle part
42 ... Flange
42 ... Branch pipe body
42D ... Branch pipe body
42a ... through hole
42b ... Flange
42c ... Connection end
44. In-pipe annular body
44a ... through hole
44b ... Tapered slope
46 ... Branched part covering
46A ... Branched part covering
46a ... Flange coating
46b ... flange lower end region
46c ... through hole
46d ... Main hose covering part
48 ... Mass for forming annular body
48a ... Slit
60D ... stopper
61 ... first core
61 Da ... head
61Db ... Male thread
61Dc ... Sealing part
61a ... First core upper half
61b ... lower half of the first core
61c ... Expansion base
61d ... through hole
62 ... concave
62a ... Sinking margin
62b ... Air vent hole
63 ... V block
64 ... Insert jig
64a ... cylindrical portion
65 ... Piston
71: Second core
71a ... Cylindrical part
71c ... tip
80 ... Mold
80a ... recess
83 ... cavity
120 ... main hose
125 ... Branch
130 ... Branch hose
130a ... Hose end
141 ... Branch passage
142 ... Branch pipe body
143 ... Female thread
144: Annular pipe
146 ... Branched part covering
150A, 150B, 150C ... Branch pipe body
152A ... Flange
152Aa ... Through hole
152B ... Flange
153C ... Flange
220 ... Main hose
221a ... passage
225 ... fork
230 ... Sub hose
250 ... Branch pipe body
252 ... Flange
260 ... Rubber molding part
BK ... Branch connection pipe
BKA ... Branch connection pipe
BKB ... Branch connection pipe
Dr ... Drill
MD ... Mandrel

Claims (4)

A branch connection pipe for guiding fluid flowing through a passage of a main hose made of a rubber material to the outside from the passage at a branch point;
A branch connection portion that forms a branch passage for guiding the fluid to the outside in communication with the passage;
The branch connection is
A branch passage first forming portion extending along an inner peripheral wall of the main hose so as to form an end portion of the branch passage in the passage of the main hose;
A branch passage second forming portion having a flange located at a distance from an outer peripheral wall of the main hose, and forming a tip portion of the branch passage outside the main hose;
A branch passage third forming portion that forms the branch passage between the branch passage end portion of the branch passage first forming portion and the branch passage tip portion of the branch passage second forming portion;
The branch portion of the main hose has a covering portion formed on the outer peripheral wall of the main hose so as to cover the flange,
The branch passage first forming portion, the branch passage third forming portion, and the covering portion are formed of a rubber material that can be integrated by vulcanization,
The branch passage first forming portion, the flared portion along said main hose wall, Rutotomoni in close contact to the main hose wall by vulcanization, the inner peripheral wall of the side large-diameter taper of the main hose Branch connecting pipe characterized by having an inclined surface . The branch connection pipe according to claim 1,
The said covering part is a branch connection pipe | tube formed so that the circumference | surroundings of the outer peripheral wall of the said main hose may be coat | covered over the perimeter in the said branch location. A method of manufacturing a branch connection pipe for guiding fluid flowing through a passage of a main hose made of a rubber material to the outside from the passage at a branch point,
A step of preparing a main hose with a branch opening in the peripheral wall of the hose;
Inserting a first core material having a concave portion formed larger in diameter than the branch port into the outer periphery of the main hose, and setting the first core material so that the concave portion overlaps the branch port;
A lump of unvulcanized or unvulcanized rubber material is inserted from the branch port, and the inserted lump is expanded and deformed so as to follow the shape of the recess, and is expanded to the peripheral edge of the branch port. Interposing the mass after deformation; and
Providing a branch passage tip portion forming member having a flange and forming a tip portion of the branch passage for guiding the fluid to the outside outside the main hose;
A mold setting step of setting the main hose on which the first core material has been set and the lump has been interposed, and the branch passage tip portion forming member in a mold; A second core material inserted at the tip of the branch passage is disposed through the branch port, and a cavity surrounding the flange and the gap is positioned at a distance from the outer peripheral wall of the hose. The mold setting step to be formed at the branch point of the hose;
A method of manufacturing a branch connection pipe, comprising: a step of performing a rubber material injection into the cavity and a subsequent vulcanization process. A claim 3 Symbol mounting method of manufacturing,
The mold setting step includes
A method for manufacturing a branch connection pipe, wherein the cavity is formed around the outer peripheral wall of the main hose over the entire circumference at the branch point.

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