JP3757725B2 - Branch hose - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch hose in which a sub hose is connected to a main hose.
[0002]
[Prior art]
Conventionally, as this kind of branch hose, for example, it is used for a hose for a radiator of an engine, and JP-A-6-101791 is known.
[0003]
FIG. 14 is a cross-sectional view showing a conventional branch hose 110. In FIG. 14, the branch hose 110 joins a main hose 111 and a sub hose 112 with a bonding rubber 113. In the main hose 111 and the sub hose 112, a reinforcing thread 111a and a reinforcing thread 112a are embedded, respectively. Further, the joint end portion 112b of the sub hose 112 is formed in a diverging shape toward the outside, and has a configuration in which the coupling strength between the main hose 111 and the sub hose 112 is increased.
[0004]
[Problems to be solved by the invention]
However, in the conventional branch hose 110, no consideration is given to the ingress of liquid from the thread layer on the end surface of the main hose 111 or the sub hose 112, and the opening peripheral edge 111b of the branch port of the main hose 111 or the sub hose 112 There has been a problem that the pressure resistance is lowered by the intrusion of water from the connection end. For example, when the end of the reinforcing thread 112a is in contact with the joint rubber 113 at the joint end 112b of the sub hose 112 and there is a joint failure between the joint rubber 113 and the joint end 112b, liquid enters from this gap. Furthermore, it penetrates into the reinforcing yarn 112a. Such intrusion of the liquid into the reinforcing yarn 112a expands the sub hose 112 and reduces pressure resistance.
[0005]
An object of the present invention is to solve the above-described problems of the prior art, and to provide a branch hose that has no pressure penetration from the end of the hose and has excellent pressure resistance.
[0006]
[Means for solving the problems and their functions and effects]
The present invention made to solve the above problems
A branch hose made of a rubber material, comprising a main hose and a sub hose embedded with a yarn layer made of a reinforcing thread, joined to the main hose at a branch connection portion formed of a rubber material,
The auxiliary hose includes a connection end that is subjected to a terminal treatment in which the yarn end of the yarn layer is bent in the outer peripheral direction and the yarn end is taken out from the outer peripheral side end of the auxiliary hose,
Connecting the auxiliary hose to the main hose by burying the connection end in the branch connection part;
It is characterized by.
[0007]
In the branch hose according to the present invention , the sub hose is connected to the main hose via the branch connection portion. The main hose and the sub hose have improved pressure resistance by burying a yarn layer made of reinforcing yarn. In addition, since the terminal treatment is applied to the connection end of the secondary hose so that the yarn layer does not appear on the surface of the secondary hose, the fluid flowing in the hose from the yarn end of the yarn layer does not enter, High pressure resistance can be maintained. In the branch hose according to the present invention, the resistance against the thread drop can be increased by bending the thread layer in the outer peripheral direction at the connecting end of the sub hose.
[0008]
As a preferred embodiment of the present invention, the resistance against thread drop can be further increased by bending the thread layer substantially at right angles to the passage of the auxiliary hose. Therefore, compared with the case where the yarn layer is gently bent and embedded along the flange as in the prior art, the present invention has a greater resistance to yarn removal. Here, the angle of the yarn layer may be a value that can increase the resistance to yarn dropout. For example, if it exceeds 70 °, a remarkable yarn drop prevention effect can be obtained.
[0014]
Moreover, as a preferable aspect of the above-described invention, the opening peripheral edge portion of the branch port of the main hose connected to the sub hose can be configured to be embedded in the branch connection portion. According to this aspect, it is possible to prevent liquid from entering the thread layer from the opening peripheral edge of the branch opening of the main hose.
[0015]
Furthermore, a preferred aspect of the present invention is:
In a branch hose made of a rubber material, provided with a plurality of hoses embedded with a thread layer made of a reinforcing thread, these hoses joined at a branch connection formed of a rubber material,
At least one of the above hoses is vulcanized in a state in which the connecting end connected to the other hose is expanded and the connecting end of the hose is crushed so as to sandwich the yarn layer at the connecting end of the hose. It has a flange that is terminal-treated so that the yarn end of the yarn layer does not come out of the hose,
A plurality of hoses were connected by embedding the flange in the branch connection part,
It is characterized by.
[0016]
According to another preferred embodiment of the present invention, in a hose connecting a plurality of hoses to each other, the connection end of at least one hose is subjected to a terminal treatment so that the thread is removed from the hose and the liquid enters from the yarn end of the yarn layer. Can be prevented.
[0017]
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.
[0018]
FIG. 1 is a front view showing a branch hose 10 according to an embodiment of the present invention, and shows a part where a sub hose 30 is branched from a main hose 20 connecting an automobile engine and a radiator (not shown). ing. FIG. 2 is a sectional end view of the branch hose 10 cut. 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, while the auxiliary hose 30 is connected to the reservoir at the other end. The main hose 20 and the sub hose 30 are connected by a branch connection portion 40.
[0019]
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.
[0020]
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. Further, a flange 34 extended in the radial direction is formed at the connection end of the sub hose 30. FIG. 3 is an enlarged sectional view showing the periphery of the flange 34. The end 34a of the flange 34 is subjected to a terminal treatment so that the yarn end of the yarn layer 33 is covered with rubber so as not to be exposed from the surface of the flange 34. The lower surface of the flange 34 is bent in a direction perpendicular to the longitudinal direction of the auxiliary hose 30, and the thread layer 33 is also bent in the radial direction along the lower surface in the flange 34. Note that the angle of the flange 34 may be any suitable angle to increase resistance to thread drop as will be described later, and is preferably 70 ° or more.
[0021]
Returning to FIG. 2, the branch connection portion 40 fixes the sub hose 30 to the main hose 20 and connects the main passage 21 a to the sub passage 31 a. The branch connection portion 40 is formed by embedding the end portion of the sub hose 30 including the flange 34 around the entire circumference of the main hose 20 by injection molding of EPDM rubber.
[0022]
In the branch hose 10 having such a connection structure, a flange 34 is formed at the end of the sub hose 30, and the flange 34 is expanded in a direction perpendicular to the longitudinal direction and embedded in the branch connection 40. Therefore, it acts as a retaining for the main hose 20, and a large bonding strength can be obtained.
[0023]
Further, when a fluid flows from the main passage 21a of the main hose 20 into the sub passage 31a of the sub hose 30 and an internal pressure is applied to the sub hose 30, this internal pressure is a force in a direction in which the sub hose 30 is expanded in the radial direction. Acts as The thread layer 33 suppresses the expansion of the auxiliary hose 30 with respect to the expanding force. However, when the expanding force exceeds the restraining force of the thread layer 33, the force that causes the thread layer 33 to escape from the auxiliary hose 30. Acts as However, the yarn layer 33 is bent at a substantially right angle within the flange 34, and has a high resistance to the pulling force. Therefore, the sub hose 30 can maintain a large pressure resistance because a portion where the yarn layer 33 is not partially lost, that is, a portion where the yarn is missing around the flange 34 does not occur. Therefore, as described in the prior art, it is possible to obtain a great effect of preventing the thread from dropping compared to the case where the bending angle of the yarn layer is less than 70 °.
Moreover, in the flange 34 of the sub hose 30, the contact resistance is increased by the thread layer 33 being crushed by the inner tube layer 31 and the outer tube layer 32.
[0024]
Further, as shown in FIG. 3, since the auxiliary hose 30 is bent at a substantially right angle by the flange 34, the distance L1 from the yarn end of the yarn layer 33 to the auxiliary passage 31a is the distance L2 when not bent. It will be longer. As described above, since the distance from the yarn end of the yarn layer 33 to the sub-passage 31a is increased, the intrusion of fluid into the yarn layer 33 can be prevented. In addition, since the yarn end of the yarn layer 33 is filled with rubber, the ingress of water is further prevented.
[0025]
Next, the manufacturing method of the said branch hose 10 is demonstrated. 4 to 6 are explanatory views for explaining a series of manufacturing steps of the branch hose 10. As shown in FIG. 4, first, an unvulcanized hose extrusion HA for forming the main hose 20 is manufactured, and a hose extrusion HB for forming the auxiliary hose 30 is manufactured. The hose extrudates HA and HB are manufactured by a normal method, that is, by winding a reinforcing yarn for forming the yarn layers 23 and 33 in a spiral manner while extruding a rubber material by an extruder. Here, as the shapes of the hose extrudates HA and HB, for example, the inner diameter of the hose extrudate HA is 30 to 37 mm, the thickness is 4.5 mm, and the inner diameter of the hose extrudate HB is 5.8 to 16 mm. it can.
[0026]
Subsequently, the hose extrudate HB is vulcanized and simultaneously brazed so that the end of the sub hose 30 becomes the flange 34. FIG. 5 is an explanatory diagram for explaining the step of brazing. The brazing process is performed using the terminal forming jig 50. As shown in FIG. 5A, the terminal forming jig 50 includes a supporting jig 51 having a supporting plate 51, a mandrel 52 protruding from the center upper surface of the supporting board 51, and a pressing jig 54. Yes.
[0027]
In order to braze the flange 34 using the terminal forming jig 50, as shown in FIG. 5B, the hose extrudate HB is inserted into the mandrel 52 of the terminal forming jig 50, and further the hose extrudate. The end of the HB is pressed against the support plate 51 to shape the flare HBa. Subsequently, as shown in FIG. 5C, the pressing jig 54 is externally mounted on the outer periphery of the hose extrudate HB through the insertion hole 54 a of the pressing jig 54, and the flare HBa is attached by the pressing jig 54. It is crushed by pinching with the support plate 51. At this time, the thread layer 33 in the hose extrudate HB moves slightly inward at the connection end of the hose extrudate HB. In this state, the hose extrudate HB is vulcanized with a vulcanizer (not shown). Thereby, the hose extrudate HB becomes the sub hose 30 having the flange 34. At this time, since the yarn end of the yarn layer 33 is sandwiched between the support plate 51 and the pressing jig 54, it is filled with rubber and is not exposed to the outside.
[0028]
Next, a step of connecting the sub hose 30 to the main hose 20 is performed. FIG. 6 is an explanatory view illustrating an injection molding process using rubber. The injection molding process is performed using a molding die 60 of an injection molding machine. The molding die 60 forms a cavity 62 for forming the branch connection portion 40 together with the core 61. In this step, the hose extrudate HA and the sub hose 30 described with reference to FIG. 5 are set in the molding die 60, and the core 61 is further set, and then the mold is clamped. A branch port 25 is formed in advance in the hose extrudate HA. In this state, a rubber material is injected into the cavity 62 and further vulcanized. Thereby, the branch hose 10 which integrated the main hose 20 and the sub hose 30 by the branch connection part 40 is formed.
[0029]
Through such a process, the auxiliary hose 30 having the flange 34 can be easily manufactured to the main hose 20 via the branch connection portion 40.
[0030]
FIG. 7 is a cross-sectional view showing a branch hose 10B according to a reference example . The branch hose 10B is characterized in that the peripheral edge of the branch port 25B of the main hose 20B and the connection end 30Ba of the sub hose 30B are flared and integrally vulcanized.
[0031]
The opening peripheral edge of the branch port 25B of the main hose 20B is shaped like a flare, and the connection end 30Ba of the sub hose 30B also has a flange formed in a flare shape, and these are connected together to form a terminal connection portion. It has become. That is, since the branch hose 10B is a terminal connection portion that is continuous and integrated in a flare shape with the main hose 20B at the connection end 30Ba, the yarns of the yarn layers 23B and 33B in the main hose 20B and the sub hose 30B. The end is not exposed to the outer surface at the connection part of both hoses. And the branch connection part 40B is formed so that this terminal connection part may be covered. In this way, the yarn ends of the yarn layers 23B and 33B are covered with the branch connection portion 40B without coming out of both the hoses, so that the intrusion of fluid from the sub passage 31Ba can be prevented. Further, since the auxiliary hose 30B is formed in a flared shape at the connection end, a large resistance can be obtained for the yarn layer 33B to come off, and the yarn does not easily come off and has excellent pressure resistance. In addition, the resistance force against the thread dropout can be adjusted by the angle of the flange of the sub hose 30B in consideration of factors such as connection workability. In addition, when the terminal connecting portion of the main hose 20B and the connecting end of the sub hose 30B are pressure-bonded to each other, the thread layers 23B and 33B are also pressed and clamped by the rubber, thereby further increasing the resistance against thread dropout. be able to.
[0032]
The branch hose 10B according to the reference example can be manufactured through the following steps. FIG. 8 is an explanatory view illustrating a process of manufacturing the branch hose 10B. First, the branch port 25B is formed in the unvulcanized or semi-vulcanized hose extrudate HA, and the periphery of the branch port 25B is further widened with a jig (not shown) (state shown in FIG. 8A). Next, the hose extrudate HB is inserted into the branch port 25B (state shown in FIG. 8B). Further, as shown in FIG. 8 (C), the support jig 71 is pressed against the opening of the hose extrudate HB from below, and subsequently, the core 72 is inserted into the hose extrudate HA, and the hose extrudate. The connecting portion between the HA and the hose extrudate HB is pressed by the fixing jig 73 from the outer peripheral side to crush the connecting portion (state shown in FIG. 8D). At this time, the thread end of each hose is not exposed from the end of the hose. Then, the hose extrudate HA and the hose extrudate HB are vulcanized , and the branch connection 40B is injection-molded in the same manner as in FIG. 6 to bond the main hose 20B and the sub hose 30B at the branch connection 40B. The branch hose 10B shown in FIG.
[0033]
FIG. 9 is a cross-sectional view showing a branch hose 10C according to a reference example . The branch hose 10C is characterized in that the connection end 30Ca of the sub hose 30C is thickened and the yarn end of the thread layer 33C is prevented from coming out of the sub hose 30C.
[0034]
That is, the connection end 30Ca of the sub hose 30C is a terminal extension portion, that is, is formed thicker and is embedded in the branch connection portion 40C to strengthen the connection between the sub hose 30C and the main hose 20C. Yes. Further, the connection end 30Ca is thickened to increase the distance between the yarn end of the yarn layer 33C and the sub-passage 31Ca, thereby preventing fluid from entering.
[0035]
The branch hose 10C can be manufactured through the following steps. FIG. 10 is an explanatory view illustrating a process of manufacturing the sub hose 30C. In FIG. 10A, the end surface of the hose extrudate HB is pressed onto the support jig 81 having the flare-shaped molding surface 81a. Thereby, the connection end 30Ca of the hose extrudate HB is expanded in a flare shape. At this time, the yarn end of the yarn layer 33C of the hose extrudate HB comes out upward in the drawing. Subsequently, the hose extrudate HB is inserted into the support rod 83 of the holding jig 82 shown in FIG. The holding jig 82 is formed with a holding hole 84 having an expanded bottom. Therefore, when vulcanization is performed with the holding jig 82 supporting the hose extrudate HB, the lower hose extrudate HB has an expanded joist and a sub hose 30C in which a hole for thread removal is filled is formed. Is done. As described above, the sub hose 30C is connected to the main hose 20C via the branch connection portion 40C. In addition, in order to increase the resistance against the thread dropout, the connection end 30Ca is formed in a ball shape by tying the end of the yarn layer 33C or shrinking it by applying heat before the step of FIG. 10 (A). May be.
[0036]
FIG. 11 is a cross-sectional view showing a branch hose 10D according to the present embodiment . The branch hose 10D has a configuration in which the sub hose 30D is inclined and connected to the main hose 20D via the branch connection portion 40D. In order to connect the inclined sub hose 30D, the yarn layer 33D It has a feature in the configuration in which the yarn end is extended to the outer peripheral side end of the sub hose 30.
[0037]
That is, since the auxiliary hose 30D is inclined with respect to the main hose 20D and forming a flange, it becomes a hindrance at the time of molding or the like, and thus the flange is not formed. Further, when the yarn end of the yarn layer 33D of the sub hose 30D comes out from the lower end surface, the distance to the sub passage 31Da is shortened, so that the distance from the outer end is increased.
[0038]
Branch hose 10D concerning this Embodiment can be manufactured through the following processes. FIG. 12 is an explanatory view illustrating a process of manufacturing a branch hose. In FIG. 12A, the flange HBd is formed at the connection end of the hose extrudate HB as described with reference to FIG. At this time, the yarn end of the yarn layer 33D is bent sideways. Then, as shown in FIG. 12B, the flange HBd is deleted. As a result, the yarn ends of the yarn layer 33D are exposed at predetermined intervals on the outer peripheral side end of the sub hose 30D. Then, the branch hose 10D is manufactured by setting the main hose 20D and the sub hose 30D in a molding die and injecting a rubber material. Thus, it is effective when the angle between the main hose 20D and the sub hose 30D is an acute angle and small, and the flange of the sub hose 30D cannot be formed large.
[0039]
In addition, the part which cut | disconnects a flange may be a perimeter or a part, for example, it is set as the structure which deletes only the flange of the part where an auxiliary hose makes an acute angle with respect to a main hose, and is a main hose with the flange which is not deleted. You may make it increase the joint strength of a sub hose.
[0040]
Furthermore, the thread ends of the thread layer 33D exposed as shown in FIG. 12B can be used as means for preventing the thread from being removed by connecting adjacent ones by sewing, or by hardening with an adhesive. In this case, it is possible to take various means such as applying heat to shrink the ball to form a ball.
[0041]
FIG. 13 is a cross-sectional view showing a branch hose 10E according to a reference example . The branch hose 10E connects the main hoses 20E, 20E and the sub hose 30E on both sides in a three-way connection with the branch connection portion 40E, and the connection ends 20Ea, 20Ea of the main hoses 20E, 20E and the connection end 30Ea of the sub hose 30E are flared. Thus, the structure is characterized by integrally vulcanizing and bonding them.
[0042]
The connection ends 20Ea and 20Ea of the main hoses 20E and 20E each have a flange formed in a flared shape, and the connection end 30Ea of the auxiliary hose 30E also has a flange formed in a flared shape, which are terminal connection portions. It has become. And the branch connection part 40E is formed so that this terminal connection part may be covered. Thus, the yarn ends of the yarn layers 23E, 23E of the main hoses 20E, 20E and the yarn layer 33E of the sub-hose 30E are further covered with the branch connection portion 40E without coming out of the respective hoses. Intrusion of liquid from the connection end can be prevented.
[0043]
Furthermore, since not only the auxiliary hose 30E but also the main hoses 20E and 20E are formed in a flared shape at the connection ends, the yarn layers 23E and 23E and the yarn layer 33E have a great resistance to the thread dropout, and therefore the pressure resistance. Excellent in properties. In addition, the resistance force against the thread dropout can be adjusted not only by the auxiliary hose 30E but also by the main hoses 20E and 20E according to the angle of the flange while considering factors such as connection workability.
[Brief description of the drawings]
FIG. 1 is a front view showing a branch hose 10 according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the branch hose 10 cut.
FIG. 3 is an enlarged cross-sectional view showing the periphery of a flange 34;
FIG. 4 is an explanatory diagram for explaining a hose extrudate HA and a hose extrudate HB.
FIG. 5 is an explanatory diagram illustrating a step of brazing.
6 is an explanatory view illustrating an injection molding process which is one process for manufacturing the branch hose 10. FIG.
FIG. 7 is a cross-sectional view showing a branch hose 10B according to a reference example .
FIG. 8 is an explanatory diagram illustrating a process for manufacturing the branch hose 10B.
FIG. 9 is a cross-sectional view showing a branch hose 10C according to a reference example .
FIG. 10 is an explanatory diagram for explaining a process for manufacturing the auxiliary hose 30C.
FIG. 11 is a cross-sectional view showing a branch hose 10D according to the present embodiment .
FIG. 12 is an explanatory diagram for explaining a process for manufacturing a branch hose.
FIG. 13 is a cross-sectional view showing a branch hose 10E according to a reference example .
14 is a cross-sectional view showing a conventional branch hose 110. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Branch hose 10B ... Branch hose 10C ... Branch hose 10D ... Branch hose 10E ... Branch hose 20 ... Main hose 20B ... Main hose 20C ... Main hose 20D ... Main hose 20E ... Connection end 21 ... Inner pipe layer 21a ... Main passage 22 ... Outer tube layer 23 ... Thread layer 23E ... Thread layer 25 ... Branch port 25B ... Branch port 30 ... Sub hose 30B ... Sub hose 30Ba ... Connection end 30C ... Sub hose 30Ca ... Connection end 30D ... Sub hose 30E ... Sub hose 30Ea ... Connection end 31a ... Sub passage 31Ba ... Sub passage 31 ... Inner tube layer 31Ca ... Sub passage 31Da ... Sub passage 33 ... Yarn layer 32 ... Outer tube layer 33B ... Yarn layer 33C ... Yarn layer 33D ... Yarn layer 33E ... Thread layer 34a ... End 34 ... Flange 40 ... Branch connection 40B ... Branch connection 40C ... Branch connection 40D ... Branch connection 40E ... Branch connection 50 ... Terminal formation Tool 51 ... Support plate 52 ... Mandrel 53 ... Support jig 54 ... Pressing jig 54a ... Insertion hole 60 ... Mold 61 ... Center 62 ... Cavity 71 ... Support jig 72 ... Center 73 ... Fixing jig 81 ... support jig 81a ... molding surface 82 ... holding jig 83 ... support bar 84 ... holding holes HA, HB ... hose extrusion HBa ... flare HBd ... flange

Claims (2)

A branch hose made of a rubber material, comprising a main hose and a sub hose embedded with a yarn layer made of a reinforcing thread, joined to the main hose at a branch connection portion formed of a rubber material,
The auxiliary hose includes a connection end that is subjected to a terminal treatment in which the yarn end of the yarn layer is bent in the outer circumferential direction and the yarn end is extracted from the outer peripheral side end of the auxiliary hose
Connecting the auxiliary hose to the main hose by burying the connection end in the branch connection part;
Branch hose characterized by. The branch hose according to claim 1 ,
A branch hose in which the opening peripheral edge portion of the branch port of the main hose connected to the sub hose is embedded in the branch connection portion.

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