JPH0557087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for processing a hose with a protector, in which a protector layer is provided on the outer periphery of a rubber hose such as a water hose or a heater hose for an automobile.

<Prior Art> Conventionally, hoses for connecting automobile radiators, heater units, etc. are made of rubber or synthetic rubber, and are disposed in places such as engine compartments where various parts converge.

As a result, the hose may come into contact with the frame or other members due to the vibrations of the vehicle, which poses a problem of reducing the service life of the hose.

On the other hand, the same applicant as the present application filed the patent application
-252086, a hose having at least the outermost layer of unvulcanized rubber is fitted onto a mandrel having a bent shape, and a tube-shaped protector made of unvulcanized rubber is fitted onto the hose. We proposed a method for manufacturing a hose with a protector, in which the protector and the protector are simultaneously vulcanized and a protector layer is adhesively attached to the outer periphery of the hose.

<Problems to be Solved by the Invention> However, in the above method for processing a hose with a protector, when the protector is fitted onto the hose,
There was a problem in that it was difficult to position the edge of the protector that was fitted onto the outside. Therefore, if the protruding length L of the hose 2 protruding from the protector 3 shown in FIG. 9 varies, and the protruding length L is smaller than the specified value, the hose 2
If the hose cannot be securely fastened to equipment such as a radiator with clips, or if the protrusion length L is larger than the specified value, the exposed portion of the hose 2 will be excessive when fastened, reducing the protector's effectiveness. .

Furthermore, if the straight line length a of the end of the protector 3 is short (for example, 60 mm or less), the protector end 3a will deform as shown in FIGS. ). When the protector end portion 3a is opened in this way, there is a problem in that water, heat, etc. enter through the gap, reducing the protector effect.

The present invention has been made in view of the above, and an object of the present invention is to provide a method for processing a hose with a protector, which can accurately form the protruding length for tightening the end of the hose and form the shape of the protector end appropriately. It is something to do.

<Means for Solving the Problems> The present invention has been made to achieve the above object, and includes fitting a hose having at least the outermost layer of an unvulcanized rubber layer onto a mandrel having a bent shape; In the method for processing a hose with a protector, in which a tube-shaped protector made of unvulcanized rubber is fitted onto the hose, and then the hose and the protector are simultaneously vulcanized, the end of the hose is attached to at least one end of the mandrel. This is a method of processing a hose with a protector, in which a retaining molding tool is attached that defines the protruding length for tightening and also defines the outer shape of the end of the protector, and then is vulcanized.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 7.
This will be explained based on the diagram.

The mandrel 1 used in this method is an iron core mandrel that has been given a predetermined curved shape and has a retention shaping tool 10 attached to its tip. In addition, at the end of the mandrel 1, a retention forming tool 20 is provided.
An annular groove 1a is provided in which a holder can be attached.

As shown in FIG. 2, the retention forming tool 10 is formed into a two-step cylindrical shape consisting of a small diameter part 12 and a large diameter part 16, and the inner wall 13 of the small diameter part 12 corresponds to the outer diameter of the hose 2. diameter, the inner end of which has a central hole 19
A step portion 14 is formed.

Further, the inner wall 17 of the large diameter portion 16 is connected to the protector 3.
and has a diameter corresponding to the outer diameter of the protector end 3
It is formed as the outer shape defining part of a. The inner end of this inner wall 17 forms a step 18 that is continuous with the inner wall 13, and the distance in the axial direction between the step 14 and the step 18 is the protrusion length L of the hose 2 from the protector end 3a. A predetermined length is given as . In addition,
The outer ends of the inner walls 13 and 17 are formed in a shape that widens toward the outside so as to facilitate insertion of the hose 2 and the protector 3, respectively.

This retention forming tool 10 has a central hole 1
The tip of the mandrel 1 is inserted into 9 and attached to the mandrel 1 by welding or the like.

An unvulcanized rubber (for example,
A tube-shaped hose 2 made of EPDM, NBR, etc.) is fitted onto the outside (see Figure 4). And hose 2
As shown in FIGS. 1 and 5, the distal end portion of the retaining mold 10 contacts the stepped portion 14 of the retaining mold 10, and its outer diameter is equal to the inner wall 1.
3.

Then, unvulcanized rubber (e.g. EPDM, CR, etc.)
A tube-shaped protector 3 made of
(See Figure 5). and,
As shown in FIGS. 1 and 6, the distal end of the protector 3 abuts against the step 18 of the retaining mold 10, its outer diameter is defined by the inner wall 17, and the protruding length L of the distal end of the hose 2 is , is defined by the distance between the stepped portions 14 and 18.

Next, a retaining mold 2 is attached to the end of the mandrel 1.
0, and its locking mechanism 23 is attached to the mandrel 1.
the annular groove 1a.

As shown in FIG. 3, the retention forming tool 20 is made up of a small diameter part 12, a large diameter part 16 formed in the same manner as the retention forming tool 10, and a spring holder part 22 extending from the small diameter part 12. It is formed into a three-stage cylindrical shape, and a locking mechanism 23 is added to the cylindrical body.

This lock mechanism 23 is connected to the spring holder portion 2.
a slide ring 24 provided inside the spring holder portion 22 and movable in the axial direction; and a sleeve 26 provided outside the spring holder portion 22 and movable in the axial direction, with one end cut off into a flap shape. The spring holder portion 22 is mainly composed of balls 29 each of which is movably disposed in three holes (not shown) drilled in the radial direction at predetermined positions of the spring holder portion 22.

This slide ring 24 is biased toward the small diameter portion 12 by a spring 25 interposed between it and a cap 22a screwed onto the end of the spring holder portion 22. And when unlocked,
While contacting the opening of the center hole 19, the ball 2
9 is received on the outer periphery of the slide ring 24.

Further, the sleeve 26 is connected to the small diameter portion 12 by a spring 27 interposed between the sleeve 26 and the cap 22a.
When the lock is unlocked, the end thereof contacts the ball 29 and presses the ball 29 inward.

When the retaining mold 20 formed in this manner is attached to the distal end of the mandrel 1, the distal end of the mandrel 1 passes through the central hole 19 as shown in FIG. move it towards As a result, the ball 29 loses its support on the outer periphery of the slide ring 24 and, due to the pressing force of the sleeve 26, fits into the annular groove 1a of the mandrel 1 that has entered. Then, the sleeve 26 moves to the left in the figure and comes over the ball 29, closes the outside of the ball 29, and attaches the retaining mold 20 to the mandrel 1.
is installed and locked. Note that this locked state can be released by pulling the sleeve 26 axially outward, thereby releasing the restriction on the ball 29 and freeing the engagement between the ball 29 and the annular groove 1a.
The retention forming tool 20 can be removed from the mandrel 1.

When this retaining mold 20 is attached to the distal end of the mandrel 1, each end of the hose 2 and the protector 3 is connected to the stepped portion 14 of the retaining mold 20, as shown in FIGS. 1 and 6. , 18, and their outer diameters are defined by the inner walls 13, 17, respectively. The protruding length L of the hose 2 is the step portion 14,
18.

Next, with the mandrel 1 inserted, the unvulcanized hose 2 and protector 3, each having retaining molding tools 10 and 20 attached to both ends thereof, are placed in a vulcanizer and vulcanized.

After the vulcanization is completed, the lock by the locking mechanism 23 is released, the retaining forming tool 20 is removed, and the mandrel 1 is pulled out from the hose 2. As shown in FIG. is completed.

In the hose with a protector manufactured in this way, the protruding length L for tightening the end of the hose 2 is accurately defined by the distance between the stepped portions 14 and 18 of the retention forming tools 10 and 20, and the protector 3 Since the outer shape of the end portion was vulcanized and molded while maintaining a proper shape by the inner wall 17, a hose with a protector having an accurate protrusion length L and an appropriate shape of the protector end portion 3a was obtained.

It should be noted that the present invention is not limited to the above-described embodiments; for example, the hose may have a multilayer structure including a reinforcing fiber layer, and the outermost layer may be formed of unvulcanized rubber.

Further, if the protector end 3a is separated from the hose 2 end by a large distance or the axes of the two are different, a retaining mold 30 as shown in FIG. 8 may be used. This retention forming tool 30 has a small diameter portion 12 and a large diameter portion 16 similar to the retention forming tool 10 of the above embodiment.
The small diameter portion 12 and the large diameter portion 16 are formed separately and are integrally connected by a connecting member 31. This retention mold 3
According to 0, the protrusion length L of the hose 2 is long,
Even if the axes of the hose 2 and the protector 3 are different, the position of the protector end 3a and its outer shape can be maintained appropriately. Note that 39 is a through hole through which the hose 2 can pass.

Furthermore, depending on the location where the hose with protector is used, vulcanization molding may be performed according to the protrusion length L and external shape of the retaining mold 10 only on the tip side.

<Effects of the Invention> As explained above, the method for processing a hose with a protector of the present invention involves fitting a hose having at least the outermost layer of an unvulcanized rubber layer onto a mandrel that has been given a bent shape; In a method for manufacturing a hose with a protector, in which a tube-shaped protector made of unvulcanized rubber is fitted onto the outside, and the hose and protector are simultaneously vulcanized, a protruding length for securing the end of the hose is attached to at least one end of the mandrel. This method allows vulcanization to be carried out by attaching a retaining mold that defines the external shape of the protector end, so it is possible to precisely define the protrusion length for tightening the end of the hose during vulcanization, and its dimensional accuracy can be improved. can be improved.

Further, since the outer shape of the protector end is vulcanized while maintaining an appropriate shape, deformation such as opening of the mouth of the protector end can be prevented, and a hose with a protector having an appropriate shape can be obtained.

With these, it is possible to prevent deterioration of the protector effect and produce a highly reliable curved hose with a protector.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the protrusion length of the hose and the defined outer shape of the protector by the retention forming tool in an embodiment of the method for processing a hose with a protector of the present invention, and FIG. FIG. 3 is a front sectional view of a mandrel equipped with a retention shaping tool to be used, FIG. 3 is a front sectional view of a retention shaping tool attached to the distal end of the mandrel, and FIGS. FIG. 4 is an explanatory diagram showing how the hose is fitted onto the mandrel, FIG. 5 is an explanatory diagram showing how the protector is fitted onto the hose, and FIG. 6 is a diagram showing how the protector is removed. An explanatory diagram showing a state in which a retaining shape is attached to the end of a fitted hose, FIG. 7 is an explanatory diagram showing a hose with a protector having a curved shape obtained by the method of the present invention, and FIG. FIG. 9 is a front sectional view showing an example of a retaining mold, FIG. 9 is a front view showing an end of a conventional hose with a protector, and FIG. 10 is a side view of FIG. 9. 1... Mandrel, 2... Hose, 3... Protector, 3a... Protector end, 10, 20...
...Retention forming tool, L...Protrusion length.

Claims (1)

[Claims] 1. After fitting a hose whose outermost layer is at least an unvulcanized rubber layer onto a mandrel that has been given a bent shape, and fitting a tube-shaped protector made of unvulcanized rubber onto the hose. , in the method for processing a hose with a protector, in which the hose and the protector are simultaneously vulcanized, a protruding length for tightening the end of the hose is defined at at least one end of the mandrel, and an external shape of the end of the protector is defined. A method of processing a hose with a protector, which is characterized by attaching a retention molding tool and vulcanizing it.