JPS601347Y2 - Flexible tube protector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a protection device for protecting a flexible pipe provided in a part of an exhaust pipe of an automobile engine from flying stones and the like.

As shown in Fig. 1, the exhaust system of an automobile engine guides the exhaust gas emitted from the engine 1 through an exhaust pipe 2 to an exhaust purifier 3 and a muffler 4 to detoxify harmful components in the exhaust gas and remove noise. The structure is such that it is dissipated into the atmosphere after attenuation.

The exhaust system configured in this way is installed under the floor of the car, but because the length of the entire exhaust system is long, the vibrations that occur when the car is running and the vibrations of the engine are not evenly transmitted throughout the exhaust system. As a result, stress is applied to a portion of the exhaust pipe 2 in a twisting direction or a bending direction, causing cracks to occur in the pipe 2.

In order to prevent this, a flexible tube 5 is connected to a part of the exhaust pipe 2, and the flexible tube 5 absorbs the stress. It is weaker than the exhaust pipe 2 and easily cracks due to stones thrown off by tires when the car is running.

For this reason, in the past, as shown in FIG. 2, the flexible tube 5 was protected by a protective tube 6 (roughly woven from ultra-fine stainless steel wire into a thick, flexible, and somewhat stretchable tube shape). By covering the periphery of the flexible tube 5, the flexible tube 5 was protected from flying stones and the like.

Both ends of the protective tube 6 are held down to the outer peripheral surface of the end of the flexible tube 5 by bands 7.7.

However, such a flexible tube protection device has the following disadvantages.

That is, the contact area between the side edge of the band 7 and the protective tube 6 (Fig. 3A)
) and the contact area between the outermost ridge 5a of the flexible tube 5 and the protection tube 6 (section B in FIG. 3) strongly rub against each other, causing the protection tube 6
Not only is the curved part 5b at the outermost end of the flexible tube 5
Stress due to vibrations transmitted to the exhaust system is concentrated at (section C in FIG. 3), and there is a risk that cracks may occur in the curved portion 5b.

The present invention aims to provide a flexible tube protection device that eliminates the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to drawings shown in examples.

FIG. 4 shows an embodiment of the invention.

The structure is similar to the conventional structure in that the flexible tube 5 is surrounded by a protective tube 6 and both ends of the protective tube 6 are pressed against the outer peripheral surface of the end of the flexible tube 5 by bands 8. In the
The inner edge of the band 8 is curved upward over the entire circumference, and the portion where the band 8 and the protection tube 6 rub against each other is formed into a curved shape.

Further, among the several ridges at the end of the flexible tube 5, at least the outermost ridge 5a is formed lower than the other central ridges 5c, 5c, and the protective tube 6 A collar 9 is attached between the inner peripheral surface of the end of the flexible tube 5 and the outer peripheral surface of the end of the flexible tube 5.

The collar 9 includes a cylindrical portion 9a that fits externally onto the end of the flexible tube 5 without a gap, and a curved portion 9b having a substantially S-shaped cross section that continues inward from the cylindrical portion 9a.

The curved portion 9b is in close contact with the outer surface of the curved portion 5b at the outermost end of the flexible tube 5, and its inner (right side in FIG. 4) end is located outside (the fourth upper side) of the outermost ridge 5a. ); Since the flexible tube protector of the present invention is constructed as described above, the protective tube 6 is located at the band 8. There is no strong rubbing against the flexible tube 5, and wear of the protective tube 6 can be effectively prevented.

That is, since the edge of the band 8 that contacts the rising portion of the protective tube 6 is curved, wear at the contact portion can be effectively prevented, and the end edge of the band 8 that contacts the rising portion of the protective tube 6 can be effectively prevented. Since the ridges 5a at the outer ends do not come into contact with each other, abrasion of this portion can also be prevented.

The protection tube 6 comes into contact with the curved portion 9b of the collar 9, but since the collar 9 is immovable with respect to the exhaust pipe 2 connected to the flexible tube 5, the ridge 5a of the flexible tube 5 contacts the curved portion 9b of the collar 9. This is because it does not move against the object.

Furthermore, since the curved portion 9b of the collar 9 is held in close contact with the curved portion 5b at the outermost end of the flexible tube 5, it is effectively prevented that stress is concentrated on the curved portion 5b and cracks occur. can.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an engine exhaust system equipped with a flexible tube, Fig. 2 is a vertical sectional view showing a conventional flexible tube protection device, and Fig. 3 is an enlarged sectional view of the X section in Fig. 2. , FIG. 4 is a sectional view similar to FIG. 3 showing an embodiment of the present invention. 2...exhaust pipe, 5...flexible pipe 5.5a
・・・・・・Protuberance at the outermost end, 5b・・・Curved part at the outermost end, 5c・・・Protuberance at the central part, 6・・・・・・
...Protection tube, 8...Band, 9...Color 9a...Cylindrical part, 9b...Curved part.

Claims (1)

[Scope of utility model registration request] The flexible tube 5, which has many ridges 5a*5c formed around it except for both ends, is covered with a protective tube 6, and the ends of the protective tube 6 are tied with bands 8, 8 to protect the ends of the flexible tube 5. In a flexible tube protector that is pressed against the outer circumferential surface, the inner edges of the bands 8, 8 that contact the rising part of the protective tube 6 are curved upward, so that the ends of the bands 8, 8 are curved upward so that the inner edge of the protective tube 6 and the inner edge of the protective tube 6 are in contact with each other. Between the outer surface of the end of the flexible tube 5,
An inwardly curved portion 9b of the cylindrical portion 9a that tightly fits onto the flexible tube 5.
The collar 9 is connected to the curved part 5 at the outermost end of the flexible tube 5.
One end of the curved portion 9b of the collar 9 is brought into close contact with the outer surface of the collar 9, and the end of the curved portion 9b of the collar 9 is connected to the ridges 5c, 5 of the central portion.
A protective device for a flexible tube, characterized in that it is mounted on the outside of the outermost ridge 5a formed lower than C.