JP2005262674A - Method for manufacturing rubber hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a rubber hose capable of suppressing decreasing in a clamping force and decreasing in sealing properties with time by using an ordinal clamping member without using a special clamping member. <P>SOLUTION: When an unvulcanized rubber hose 10A molded into a tube-like shape is vulcanized, the unvulcanized rubber hose 10A is vulcanized by using a partial compression mold 20 with a projected mold part 26 for partially pushing a scheduled clamping position into a diameter decreasing direction by the clamping member and pressing it, and a recessed part is made by partially compression-molding in advance the scheduled clamping position at the same time as the vulcanization processing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a rubber hose, and more particularly to a method for manufacturing a rubber hose that is connected and fixed to a mating member by a clamp member.

Conventionally, as a method for fixing and fixing a rubber hose, there is a method in which a rubber hose is connected and fixed to a mating member by tightening the outer peripheral surface of the end of the rubber hose in a reduced diameter direction with a clamp member in a state where the mating member is inserted into the rubber hose in the axial direction. Widely adopted.
4 and 5 show specific examples.
In the figure, reference numeral 200 denotes a rubber hose, and 202 denotes a mating member made of a metal pipe or the like for connecting and fixing the rubber hose 200.

In FIG. 4 (III), reference numeral 204 denotes a clamp member for fixing the connection of the rubber hose 200, which has a tightening band 206 and a tightening mechanism 208.
Here, the tightening mechanism 208 includes a cylindrical housing 210 and a screw member 212 that is screwed into the housing 210.
In order to connect and fix the rubber hose 200 to the mating member 202 using the clamp member 204, a fastening band 206 wound around the outer peripheral surface of the end portion of the rubber hose 200 with the mating member 202 inserted in the rubber hose 200 in the axial direction. Is tightened in the direction of diameter reduction by screwing the screw member 212.

4I shows the rubber hose 200 alone before the mating member 202 is inserted, and FIG. 4II shows a state where the mating member 202 is inserted into the rubber hose 200.
FIG. 4 (III) shows a state in which the outer peripheral surface of the end portion of the rubber hose 200 is tightened in the diameter reducing direction by the clamp member 204 thereafter.

Further, FIG. 5 (IV) shows a state in which the tightening band 206 of the clamp member 204 bites into the outer peripheral surface of the end portion of the rubber hose 200 in the diameter reducing direction.
At this time, a strong compressive force in the diameter reducing direction acts on the clamp portion of the rubber hose 200 by the clamp member 204.
The rubber hose 200 is held in a state of being strongly fixed to the mating member 202 by a stress based on the compression force.

By the way, in such a hose connection structure, if such a state continues for a long time, the clamp portion by the clamp member 204 of the rubber hose 200 causes compression set, so-called sag, and the clamping force by the clamp member 204 decreases with time. End up.
Particularly in automobile hoses and the like disposed in the engine room or the like, such a phenomenon is promoted by application of heat from the engine.
As a result, the clamping force by the clamping member 204 with respect to the rubber hose 200 is reduced, resulting in a problem that the sealing performance is lowered.

FIG. 5 (V) shows a state in which the rubber hose 200 has undergone such compression set or sag, that is, irreversible permanent deformation. When such permanent deformation occurs as shown in the drawing, the clamp member 204 is shown. Even if the rubber hose 200 is removed, the recessed portion 214 remains in a ring shape at the tightening portion by the clamp member 204 in the rubber hose 200.
The depth of the concave portion 214, that is, the permanent deformation is a decrease in the clamping force by the clamp member 204.

Conventionally, attempts have been made to solve such problems.
For example, Patent Document 1 below discloses that a leaf spring is assembled to a clamp member as a bias device, and a reduction in clamping force due to permanent deformation of a rubber hose is prevented by using an elastic force of the leaf spring. ing.
However, the one disclosed in Patent Document 1 has a problem that a bias device composed of a special leaf spring or the like must be added to the clamp member, that is, a special clamp member must be used.

JP-A-5-209699

  In view of such circumstances, the present invention provides a method for manufacturing a rubber hose that can suppress a decrease in clamping force and a decrease in sealing performance over time without using a special clamping member. It was made as a purpose.

  Thus, according to the first aspect of the present invention, there is provided a method for manufacturing a rubber hose in which the outer peripheral surface is tightened in the direction of diameter reduction by the clamp member and connected and fixed to the mating member. In the treatment, the unvulcanized rubber hose is vulcanized using a partial compression mold having a convex portion that presses and presses a predetermined tightening portion by the clamp member in the diameter-reducing direction, and the vulcanization treatment is performed. At the same time, a predetermined tightening location by the clamp member is previously compression-molded partially in a concave shape along the circumferential direction.

  According to a second aspect of the present invention, in the first aspect of the present invention, the partial compression mold is a cap mold that is fitted on the outer peripheral surface of the end portion of the unvulcanized rubber hose in an outer fitting state.

Effects and effects of the invention

As described above, in the present invention, when an unvulcanized rubber hose molded into a tube shape is vulcanized, a portion to be tightened by a clamp member is compression-molded into a concave shape in a reduced diameter direction using a partial compression mold. is there.
According to the present invention, in order to preliminarily compress and compress the planned tightening location by the clamp member in the reduced diameter direction, the rubber hose is connected and fixed to the counterpart member by tightening the same location with the clamp member, It is possible to prevent the tightening portion by the clamp member of the rubber hose from being permanently deformed due to the change with time or the action of heat, thereby reducing the clamping force, and accompanying this, reducing the sealing performance.

Since the tightening portion by the clamp member of the rubber hose is in a compressed state in advance, permanent deformation after clamping can be suppressed less than when the portion is not compressed at all.
As a result, a decrease in clamping force and a decrease in sealing performance can be satisfactorily suppressed.

The production method of the present invention also has the following advantages.
That is, in the rubber hose manufactured according to the present invention, the planned tightening portion by the clamp member on the outer peripheral surface of the end portion is in a state of being formed into a concave shape in advance. It becomes possible to carry out easily and accurately.
Alternatively, it is possible to eliminate the need for marking in advance on the outer peripheral surface of the end portion of the rubber hose in order to display the position for clamping by the clamp member.

In this invention, the said partial compression type | mold can be comprised as a cap type | mold fitted to the outer peripheral surface of the edge part of an unvulcanized rubber hose by the external fitting state (Claim 2).
In this way, the partial compression mold can be easily mounted on the outer peripheral surface of the end of the unvulcanized rubber hose, and the unvulcanized rubber hose can be vulcanized under the mounted state.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 2, reference numeral 10 denotes a rubber hose manufactured by the manufacturing method of this embodiment, which has a laminated structure of an inner rubber layer 12, a reinforcing layer 14, and an outer rubber layer 16.
The rubber hose 10 has an annular recess 18 formed on the outer peripheral surface of the end.
The recessed portion 18 is formed by compressing and deforming the outer peripheral surface of the unvulcanized rubber hose 10A, which will be described later, partially in the reduced diameter direction (portion indicated by a two-dot chain line in the figure), and vulcanizing in the compressed deformation state. It is a part generated by processing.
The annular recess 18 functions as a mounting groove for the clamp member 204 shown in FIG.

In FIG. 1, the manufacturing method of this rubber hose 10 is specifically shown step by step.
In this embodiment, as shown in FIGS. 1 (II) and (A), the mandrel 19 is inserted into the unvulcanized rubber hose 10A formed into a tube shape as shown in FIG. 1 (I). A partially compressed die 20 made of a cap is fitted into the outer peripheral surface of the end of the unvulcanized rubber hose 10A.

Here, as shown in FIGS. 1 (II) and 1 (B), the partial compression mold 20 has a split configuration (here, a split configuration) in the direction perpendicular to the axis (vertical direction in the figure). Is fitted to the outer peripheral surface of the end of the unvulcanized rubber hose 10A in the direction perpendicular to the axis.
As shown in FIGS. 1 (II) and (A), the partial compression mold 20 is provided with an annular protrusion 22 for positioning, and the protrusion 22 is positioned on the mandrel 19. The partial compression mold 20 is positioned with respect to the mandrel 19 by being fitted in the annular recess 24 for use.
In this partial compression mold 20, convex portions 26 protruding in the centripetal direction are formed in an annular shape on the inner peripheral portion, and these convex portions 26 are the outer peripheral surfaces of the end portions of the unvulcanized rubber hose 10A. The portion to be tightened by the clamp member 204 is partially pressed in the reduced diameter direction to pressurize it.
As a result, the unvulcanized rubber hose 10A is in a state where the portion corresponding to the convex portion 26 is compressed in the diameter reducing direction.

In this embodiment, as shown in FIG. 1 (III) in this state, they are charged into a vulcanizing can and subjected to heat vulcanization over a predetermined time.
When the vulcanization treatment operation for a predetermined time is finished, the rubber hose 10 after the vulcanization treatment is taken out of the vulcanization can together with the mandrel 19 and the partial compression mold 20, and the partial compression mold 20 and the mandrel 19 are further vulcanized. By removing from the rubber hose 10, the rubber hose 10 shown in FIG. 2 is obtained.
In the rubber hose 10, the portion where the convex portion 26 of the partial compression mold 20 was located is partially compression-molded in the diameter reducing direction, and the portion where the convex portion 26 was located is an annular concave portion. It remains as 18.

In order to connect the rubber hose 10 to the mating member 202 of FIG. 4, the mating member 202 is inserted into the rubber hose 10 in the axial direction, and in this state, the clamp member 204 is attached to the recessed portion 18 in a positioned state. Tighten in the direction of diameter reduction.
Here, the inner peripheral side portion of the recessed portion 18 at the end of the rubber hose 10 is tightened in the diameter reducing direction by the clamp member 204, and the end of the rubber hose 10 is connected and fixed to the mating member 202 in a tightened state with the tightening force. .

According to the manufacturing method of the rubber hose 10 of the present embodiment as described above, the concave portion 18 is fastened with the clamp member 204 and the rubber hose 10 is connected and fixed to the mating member 202, or by the change of time or the action of heat. It can be suppressed that the tightening portion by the clamp member 204 is permanently deformed and the clamping force is reduced, and that the sealing performance is deteriorated due to the reduction of the clamping force.
Specifically, the permanent deformation after clamping is less than that in the case where the tightening portion by the clamp member 204 is not compressed in advance, and therefore it is possible to satisfactorily suppress a subsequent decrease in clamping force and a decrease in sealing performance.

  Furthermore, in this embodiment, since the recessed part 18 is formed in the outer peripheral surface of the end part of the rubber hose 10, the clamping member 204 can be positioned easily and accurately when performing the clamping work by the clamping member 204, or the clamping It is possible to eliminate the need for marking the end of the rubber hose 10 in advance for positioning the member 204.

  In the present embodiment, the partial compression mold 20 is configured as a cap mold that is fitted to the outer peripheral surface of the end portion of the unvulcanized rubber hose 10A. It can be attached to the outer peripheral surface of the end portion of 10A, and vulcanization can be performed while maintaining the attached state.

FIG. 3A shows another embodiment of the present invention. Here, the partial compression mold 20 is an integral structure made of an elastic body.
In this case, the partial compression mold 20 is pushed in and fitted into the unvulcanized rubber hose 10A in the axial direction.
At this time, by partially fitting the partial compression mold 20 in the axial direction with respect to the mandrel 19 while elastically deforming the elastic protrusion 22 in the diameter increasing direction, and elastically fitting the protrusion 22 to the recess 24 of the mandrel 19, The partial compression mold 20 is positioned with respect to the mandrel 19.
Also by doing in this way, the planned tightening location by the clamp member 204 of the rubber hose 10 can be compression molded in advance, and at the same time, the mounting groove of the clamp member 204 can be formed.

FIG. 3B shows still another embodiment.
In this example, the partial compression mold 20 is an integral structure made of an inelastic material, and the O-ring 28 having elasticity is used to position the partial compression mold 20 with respect to the mandrel 19.
Here, the O-ring 28 is fitted over the annular groove 30 of the partial compression mold 20 and the recess 24 of the mandrel 19 to position the partial compression mold 20.
Further, when the integral partial compression mold 20 is axially pushed and fitted into the mandrel 19 and the unvulcanized rubber hose 10A, the elastic O-ring 28 is elastically deformed, whereby the partial compression mold 20 is pushed into the mandrel 19. Is possible.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied when manufacturing a curved rubber hose or when manufacturing a straight tubular rubber hose. The present invention can be implemented in variously modified forms without departing from the spirit of the invention.

It is a figure which shows the manufacturing method of the rubber hose of one Embodiment of this invention. It is a figure which shows an example of the rubber hose manufactured according to the procedure shown in FIG. It is a figure which shows the manufacturing method of the rubber hose of other embodiment of this invention. It is a figure which shows the manufacturing method of the conventional rubber hose. It is explanatory drawing of the malfunction of the manufacturing method of the rubber hose of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rubber hose 10A Unvulcanized rubber hose 18 Concave part 20 Partial compression type 26 Convex part

Claims (2)

A method for manufacturing a rubber hose, the outer peripheral surface of which is tightened in a reduced diameter direction by a clamp member and connected and fixed to a counterpart member,
When vulcanizing the unvulcanized rubber hose formed into a tube shape, the uncompressed portion is used by using a partial compression mold having a convex portion that partially presses and presses a predetermined tightening portion by the clamp member in the diameter reducing direction. A method for producing a rubber hose, characterized in that a vulcanized rubber hose is vulcanized, and at the same time as the vulcanization treatment, a portion to be tightened by the clamp member is previously compression-molded partially in a concave shape along the circumferential direction.   2. The method for manufacturing a rubber hose according to claim 1, wherein the partial compression mold is a cap mold that is fitted onto an outer peripheral surface of an end portion of the unvulcanized rubber hose.

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