JPS609515Y2 - Automotive hose connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device for a hose of an automobile, which is installed in a high-temperature exhaust branch pipe to connect a hose, for example, to extract exhaust gas pressure.

The connecting pipe of such a hose connecting device is made of metal,
Heat from the exhaust branch pipe is conducted to the hose through this metal connecting pipe, which causes thermal deterioration of the hose, such as reduced flexibility, which can lead to hose breakage.

Therefore, in order to prevent thermal deterioration of the hose, it has been proposed to use resin connecting pipes, but resin connecting pipes have low strength and need to be made thicker to have the same strength as metal connecting pipes. It has the disadvantage of being necessary.

An object of the present invention is to relate to an automobile hose connection device that can effectively prevent hose deterioration without increasing the diameter of the connection pipe.

In order to achieve this object distantly, the automotive hose connection device of the present invention has a metal connecting pipe connected to a heat source and fitted around the hose, at least around the outer periphery of the fitting range with the hose. has a coating of thermally insulating material.

Next, embodiments of the present invention will be described with reference to the drawings.

A metal connecting pipe 2 is attached to the exhaust branch pipe 1 which acts as a heat source.

The connecting pipe 2 has, for example, an outer diameter of 4 mm and an inner diameter of 2 to 3 mm.

The outer peripheral surface of the connecting pipe 2 is coated with a resin 3 as a heat insulating material.

In this embodiment, the resin 3 as a coating covers the entire range of the metal connecting pipe 2 except for the insertion range where it is inserted into the exhaust branch pipe 1.
It is provided on the outer periphery of the .

In order to coat the resin 3, a method is used in which the connecting tube 2 is coated with resin, or the connecting tube 2 is surrounded with a heat-shrinkable resin sleeve and heat treated.

The end of the rubber hose 4 is fitted into the outer peripheral surface of the connecting pipe.

In this way, heat conduction from the connecting pipe 2 to the rubber hose 4 is appropriately suppressed by the resin 3 interposed between the connecting pipe 2 and the rubber hose 4, and thermal deterioration of the rubber hose 4 is prevented.

FIG. 2 shows an apparatus used to examine the effects of the present invention.

One end of the connecting tube 11 was fixed to the heat source 12, and the outer surface temperature of the connecting tube 11 at a distance a dimension a (=10 mm) from the heat source 12 was measured by a thermocouple 13.

In FIG. 3, the horizontal axis is the temperature T of the heat source 12, and the vertical axis is the temperature T2 measured by the thermocouple 13.

FIG. 4 shows the life span of the rubber hose estimated from the graph in FIG. 3, the horizontal axis shows the temperature T1 of the heat source 12, and the vertical axis shows the time H until the rubber hose thermally deteriorates to a predetermined hardness.
is expressed as life time on a logarithmic scale.

In Fig. 3 and Fig. 4, A□ to A5 are respectively connected to the uncoated metal connecting pipe A□, the metal connecting pipe with a 150μ resin coating on the outer circumference, and the metal connection pipe with a 300μ resin coating on the outer circumference. Metal connecting tube A4 with a resin coating of 500μ on the outer peripheral surface, and resin connecting tube A,
It shows the characteristics of

It can be seen that by applying a resin coating to the surface of the connecting pipe, heat conduction is suppressed and the life of the rubber hose is significantly increased.

For example, a 150μ resin-coated metal connection pipe 2 has a T□=100'C of 15
℃, Ti ” At 140℃, the temperature is 20℃ lower, and T
When □ = 100℃, the life will be 4 times longer, and when T = 140℃, the life will be 6 times longer.

In the example, resin 3 is used as a coating made of a heat insulating material.
is provided on the outer periphery of the metal connecting pipe 2 in the entire range except for the insertion range where it is inserted into the exhaust branch pipe 1, but the resin 3
It is sufficient that the metal connecting pipe 2 has the resin 3 at least on the outer periphery of the fitting range with the rubber hose 4. It is.

That is, the resin 3 in the area exposed from the rubber hose 4 may not be present.

As described above, according to the present invention, by coating the outer periphery of the metal connecting pipe with a thermally insulating material at least in the range where it fits with the hose, the hose can be secured while ensuring a predetermined strength without making the connecting pipe thicker. It is possible to effectively suppress heat conduction to the hose, prevent thermal deterioration of the hose, and improve the life of the hose.

Furthermore, the resin coating process can be carried out using simple incidental equipment and is inexpensive.

[Brief explanation of the drawing]

Figure 1 shows an example of the invention, Figure 2 shows the experimental equipment used to examine the effects of the invention, and Figure 3 shows that the invention suppresses heat conduction. The experimental graph, FIG. 4, is a graph showing the improvement in the life of the rubber hose based on the experimental results shown in FIG. 1...Exhaust branch pipe, 2...Metal connection pipe, 3...Resin, 4...Rubber hose.

Claims (1)

[Scope of utility model registration request] A connection device for a hose of an automobile, characterized in that a metal connection pipe connected to a heat source and fitted around the outer circumference of the hose is coated with a heat insulating material at least on the outer circumference of the fitting range with the hose. .