JP2001208280A - Multiple resin hose with binding protector and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multipe resin hose with binding protector and its manufacturing method resinifying a metal pipe used for a fuel pipe, etc., for an automobile, easily manufactured and fitted to the car body, and reducing the cost. SOLUTION: This multiple resin hose comprises a plurality of resin tubes having bending shape and a protector rubber 12 extrusion-covering on its outer circumference and adjacent protector rubbers 12 are connected in the length direction in the connecting part except for the both ends. This multiple resin hose 10 with binding protector is so manufacture that unvulcanized rubbers extrusion-cover in such a state as connected to each other in the outer circumference of a plurality of resin tubes 11 aligned across clearance, are vulcanized, bound by the protector rubber 12, and cut into a prescribed length and the connecting parts 13 of the protector rubbers 12 in the both ends are cut, split, and bending formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin tube or hose used for a fuel pipe of an automobile, and more particularly to a multiple resin hose with a binding protector in which a plurality of resin tubes are bound by a protector.

[0002]

2. Description of the Related Art Conventionally, a multiple metal pipe in which a plurality of metal pipes are partially bound by clips, brackets, or the like has been used as a fuel pipe connecting an automobile fuel tank and an engine. Further, the multiple metal pipe has a complicatedly bent shape for installation at the bottom of the vehicle body, and the lower surface is generally covered with a resin protector to protect it from flying stones and the like.

In recent years, however, it has been required to reduce the weight of vehicles and reduce manufacturing costs. Fuel pipes made of multiple metal pipes are also heavy in weight and have a problem of corrosion due to rust. It has been proposed to. In particular, it is desired that all the pipes from the engine side to the fuel tank side be made of resin, and further, to be one pipe.

In response to such a demand, for example, Japanese Patent Laid-Open
JP-A-346195 discloses that a plurality of hose bodies 1 made of resin and a protector 2 made of foamed silicone rubber having a plurality of insertion holes are linearly formed by an extrusion molding method. A method of manufacturing a convergent resin hose 3 in which a hose body 1 is inserted into an insertion hole to form a hose intermediate body, and then this hose intermediate body is bent is described.

[0005]

However, in the method described in Japanese Patent Application Laid-Open No. Hei 5-346195, after a resin hose body 1 and a protector 2 are separately extruded, a plurality of resin hose bodies 1 are formed. It has to be inserted one by one into each of the insertion holes of the protector 2, and the work efficiency is poor, so it has been difficult to respond to the demand for cost reduction. In particular, when a single converging resin hose 3 is used from the engine side to the fuel tank side, both the resin hose body 1 and the protector 2 become extremely long, so that the insertion work is extremely troublesome and the work efficiency is further improved. It falls further.

In the converging resin hose 3, since the protector 2 has a thick sheath, each resin hose body 1 is exposed from both ends of the protector 2 and must not be protruded long. It cannot be guided to each connection port, nor can a connector be attached by expanding the end of each resin hose body 1. Therefore, each of the resin hose bodies 1 protruding from the protector 2 for a long time has a problem that it is necessary to separately provide a protector for protection, which is not satisfactory.

The present invention has been made in view of such a conventional situation,
To provide a multiple resin hose with a bundling protector and a method for manufacturing the same, in which metal pipes used for automobile fuel pipes and the like are made of resin, and their manufacture and attachment to a vehicle body are easy and cost reduction can be achieved. With the goal.

[0008]

In order to achieve the above object, a multiple resin hose with a binding protector provided by the present invention comprises a plurality of resin tubes aligned in the axial direction with a certain gap therebetween; A multiple resin hose with a bundling protector, comprising a protector rubber in which each of the resin tubes is extruded and covered in a buried state, wherein the adjacent resin tube is an intermediate portion excluding both end portions in a longitudinal direction, and the protector rubber is The connection portion is connected in the length direction to fill the gap, and at least the intermediate portion is provided with a bent portion formed by bending and forming the plurality of resin tubes aligned with the protector rubber. Features.

Further, the method for manufacturing a multiple resin hose with a bundling protector according to the present invention comprises a step of extruding a plurality of resin tubes in advance and a step of aligning the plurality of resin tubes at a predetermined interval with each other. A step of extruding and coating an unvulcanized rubber on the outer periphery of each resin tube so as to fill the gap and connect with each other along the length direction, and vulcanizing the unvulcanized rubber to connect the plurality of resin tubes at a connecting portion. Bundling with a protector rubber connected in the length direction to form a multiple resin hose long body, and cutting the obtained multiple resin hose long body into a predetermined length to obtain a multiple resin hose body A step of cutting a connecting portion of the protector rubber connecting the resin tubes of the multiple resin hose body to each other by a predetermined length at both ends thereof to divide the resin tube into each of the resin tubes; Heat and soften the body Is set in the mold, characterized in that it comprises a step of forming bent into a predetermined curved shape.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, FIGS.
As shown in the figure, a multiple resin hose 10 with a binding protector
Is composed of a plurality of resin tubes 11 having a constant wall thickness and a cylindrical wall extending in parallel with the axis, and protector rubbers 12 each of which is extruded and coated on the outer periphery of each resin tube 11. Except for both end portions 12a, the protector rubber 12 covering the outer periphery of the eleventh portion 11 has an intermediate portion connected to each other in a length direction by a connecting portion 13 that fills a gap between the resin tubes 11.

That is, in the multiple resin hose with a binding protector 10 of the present invention, the resin tubes 11 aligned in parallel with a gap therebetween are substantially covered with a protector rubber 12 having substantially the same thickness. Extrusion coating is performed over the entire length, and both ends 12 a are protected by the protector rubber 12.
Except for being tied together. Accordingly, each protector rubber 12 has substantially the same thickness except for the connecting portion 13, has a substantially cylindrical cross section, and is arranged concentrically with the resin tube 11. In addition, the adjacent protector rubber 12
Is formed by contacting or overlapping a part of the outer peripheral surface of each protector rubber 12.
The width h of 3 is preferably about 1 to 2 mm.

Although FIGS. 1 and 2 show two resin tubes 11 in a row, the present invention is not limited to this. The material of the resin tube is nylon 11
A thermoplastic resin having excellent gasoline resistance such as nylon or nylon 12 is preferable, and a resin tube having a multilayer structure in which a polyamide resin is coated on the outer periphery of an inner layer of ethylene tetrafluoroethylene copolymer can be used. Further, the material of the protector rubber is preferably a solid type or sponge type rubber which can prevent damage to the resin tube, and for example, EPDM which is excellent in weather resistance, heat resistance, flame retardancy and shock absorption can be used. .

In order to manufacture the multiple resin hose with a binding protector of the present invention, first, a long resin tube 11 having a constant thickness and extending substantially straight is extruded, and then a plurality of long resin tubes 11 are formed. While the resin tubes 11 are aligned with a gap therebetween, an unvulcanized rubber is further extrusion-coated to a substantially constant thickness on the outer periphery thereof. At that time, the resin tubes 11 are aligned and supplied to the rubber extruder so that the unvulcanized rubber fills the gap between the resin tubes 11, and the nipple and the die of the rubber extruder are also adjusted accordingly. Make it. As a result, the unvulcanized rubber that covers the outer periphery of each long resin tube 11 in a buried state is formed in a state where the resin tubes adjacent to each other are connected to each other at the connection portion of the unvulcanized rubber along the length direction. You.

Next, the unvulcanized rubber on the outer periphery of each long resin tube 11 is vulcanized to form a protector rubber 12. Thereby, each of the long resin tubes 11 is covered with the protector rubber 12 having a substantially cylindrical shape, and is bound by the protector rubber 12 connected by the connecting portion 13 which fills the gap between the adjacent resin tubes 11. A long hose body is obtained. In order to suppress foaming of the unvulcanized rubber at the time of vulcanization, a resin or lead is further applied to the outer periphery of the unvulcanized rubber to a thickness of 1 to 2 in advance.
It is preferable to perform vulcanization after coating to a thickness of 0.1 mm. The resin or lead coating is peeled off after the vulcanization is completed. Of course,
The unvulcanized rubber can be put into a vulcanization can as it is without coating with resin or lead, and vulcanized by applying temperature and pressure.

Further, as shown in FIG. 3, it is more efficient if the respective steps up to the production of the long continuous resin hose are continuously performed. That is, a plurality of resin tubes are simultaneously extruded from the resin extruder 4 and cooled by the cooling device 4a, and then the plurality of resin tubes are continuously aligned and supplied to the rubber extruder 5 as it is. The rubber extruder 5 continuously coats the outer periphery of each resin tube with unvulcanized rubber, and further coats the resin extruder 6 with a resin for preventing foaming. The obtained multi-piece resin hose long body is continuously supplied to, for example, a rotary drum type vulcanizing device 7, and after vulcanizing rubber beforehand, the peeling device 8 cuts the resin for preventing foaming of the outermost layer. And peel off. The obtained multiple resin hose long body is
It winds up on the drum of the winder 9.

The multi-piece resin hose is cut into a predetermined length to form a multi-piece resin hose body, and the center of the connecting portion 13 is set in the length direction at both ends 12a of the protector rubber 12 connected to each other. And cut along a predetermined length to divide. The length of the multiple resin hose body is appropriately determined according to the application. For example, when piping from the engine side to the fuel tank side is performed with one hose, the length is set to 2 to 4 m according to the length of the automobile.

The reason why the end portions 12a are cut off and divided is to guide the end portions 12a to the connection points on the engine side and the fuel tank side for each resin tube 11, and bend each later. Each protector rubber 1
Numeral 2 has substantially the same thickness and is arranged concentrically with each resin tube 11, and a part of the outer peripheral surface thereof is in contact with or overlaps to form a connecting portion 13. Therefore, each of the two end portions 12a cut and divided by the connecting portion 13 has substantially the same cross-sectional shape in which the protector rubber 12 is concentrically covered on the outer periphery of the resin tube 11, and each of the end portions 12a is a resin tube with a protector rubber. Function.

Finally, the multiple resin hose body manufactured as described above is heated and softened, and the entire body including both end portions 12a is set in a molding die, for example, heated at 170 ° C. for about 20 minutes, and then cooled. At least the intermediate portion, generally the intermediate portion and both end portions 12a are bent into a predetermined bent shape. Thus, the multiple resin hose with the binding protector of the present invention can be manufactured.
In the step of vulcanizing the unvulcanized rubber on the outer periphery of each resin tube 11, the unvulcanized rubber may be completely vulcanized,
In the case of semi-vulcanization, when the multiple resin hose body is heated and softened, it may be completely vulcanized from semi-vulcanized.

Further, when piping the multiple resin hose with a binding protector to an automobile, as shown in FIG. 4, if necessary, the ends of the resin tubes 11 at both ends 12a are expanded by flaring or the like. Then, a connector 14 such as a well-known quick connector is press-fitted into the enlarged end and attached. Thereafter, the multiple automobile hose with the binding protector may be attached to the bottom of the vehicle body with a bracket or a clip, and the connectors 14 at both ends may be connected to connection points on the engine side and the fuel tank side, respectively.

In particular, conventionally, a resin tube with a protector is piped in the vehicle body on the engine side and the fuel tank side, and a metal pipe is arranged on the bottom of the vehicle body in the middle, and these are often connected using connectors. . However, if the multiple resin hose with a binding protector of the present invention is used, the entire bending process is easy. Therefore, the whole from the engine side to the fuel tank side is connected with one multiple resin hose with the binding protector. Thus, the number of connection points can be reduced, and at the same time, the number of components can be reduced, and the cause of liquid leakage from the connection points can be reduced.

[0021]

According to the present invention, a metal pipe used for a fuel pipe of an automobile or the like is made of resin, and its manufacture and mounting on a vehicle body are simple, and cost reduction can be achieved. The present invention can provide a multiple resin hose with a binding protector, which can be piped from the fuel tank side to the fuel tank side, and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a multiple resin hose with a binding protector of the present invention.

FIG. 2 is a perspective view in which the other end side of the multiple resin hose with a binding protector of the present invention is omitted.

FIG. 3 is a process diagram for illustrating a continuous process up to a continuous resin hose long body according to the present invention.

FIG. 4 is a perspective view in which a central portion of a multiple resin hose with a binding protector having connectors attached to both ends is omitted.

FIG. 5 is a perspective view showing a conventional converging resin hose.

[Explanation of symbols]

 Reference Signs List 4 resin extruder 5 rubber extruder 6 resin extruder 7 vulcanizing device 8 peeling device 9 winding machine 10 multiple resin hose with bundling protector 11 resin tube 12 protector rubber 13 connecting part 14 connector

Claims (3)

[Claims] 1. A multiple resin hose with a binding protector comprising: a plurality of resin tubes which are aligned in the axial direction with a certain gap therebetween; and a protector rubber formed by extruding and covering each of the resin tubes in an embedded state. The adjacent resin tube is connected in the length direction by filling the gap by a connection portion of the protector rubber at an intermediate portion excluding both ends in the length direction, and at least the protector is connected to the intermediate portion. A multiple resin hose with a binding protector, comprising a bent portion formed by bending together a plurality of resin tubes aligned with rubber. 2. A step of extruding a plurality of resin tubes in advance, and forming each of the plurality of resin tubes such that the plurality of resin tubes are connected to each other along a length direction while filling the gaps while aligning the plurality of resin tubes at a predetermined interval. A step of extruding and coating an unvulcanized rubber on the outer periphery of the resin tube; vulcanizing the unvulcanized rubber and binding the plurality of resin tubes with a protector rubber connected in a length direction at a connecting portion; A step of forming a long hose body, and cutting the obtained multiple resin hose long body into a predetermined length,
A step of forming a multiple resin hose body; and a step of cutting a connecting portion of the protector rubber connecting the respective resin tubes of the multiple resin hose body to each other by a predetermined length at both ends thereof to divide the resin tube into each of the resin tubes. And a step of heating and softening the multiple resin hose body, setting the same in a mold, and bending the same into a predetermined bent shape. 3. The method according to claim 2, wherein the steps from the step of extruding the plurality of resin tubes to the step of vulcanizing unvulcanized rubber to form a multiple resin hose elongated body are continuously performed. 3. The method for producing a multiple resin hose with a binding protector according to item 1.