JPH07102963A - Attaching method for exhaust pipe damper - Google Patents

Abstract

PURPOSE:To remarkably improve adhesion of a vibration proof member, formed by a cloth form matter formed by knitting thin metal wire shaped matters, to an exhaust pipe and thereby, to reduce radiation sound of the exhaust pipe efficiently. CONSTITUTION:In a method for attaching a damper of an exhaust pipe for attaching a cylindrical vibration proof member 2 formed by a cloth form matter formed by knitting a thin metal wire shaped matter 2a on the surface of an exhaust pipe 1, the exhaust pipe 1 is inserted in the vibration proof member 2 after the vibration proof member 2 is heated and thermally expanded and the vibration proof member 2 is welded to both end parts 1a of a straight pipe shaped part of the exhaust pipe and then the vibration proof member 2 is cooled and contracted to closely adhere to the surface of the exhaust pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a damper on an exhaust pipe, and more particularly to a method for mounting a damper on an exhaust pipe so as to increase the contact ratio of a vibration damping member to the exhaust pipe.

[0002]

2. Description of the Related Art Radiated sound from an exhaust pipe is often a problem as external noise of an automobile. The exhaust pipe is generally made of a thin steel pipe and has almost no vibration damping effect by itself, so that when the vibration from the engine is transmitted to the exhaust pipe, it causes a radiated sound from the exhaust pipe.

Therefore, as a means for preventing the above-mentioned radiated sound, the present inventor has conducted various researches on them, and as a result, the vibration-proof member formed of a cloth-like material in which thin metal linear bodies are braided is adhered to the surface of the exhaust pipe. By holding it, even if the exhaust pipe resonates at a predetermined frequency, the closely attached metal linear bodies are displaced following the oscillating movement of the exhaust pipe. It has been found that friction is generated, and the vibration effectively attenuates the vibration of the exhaust pipe to effectively attenuate the radiated sound.

By the way, when attaching the above-mentioned vibration isolator to the exhaust pipe, the exhaust pipe is fitted into the tubular vibration isolator, and both ends of the vibration isolator are welded to be fixed to the exhaust pipe, or a belt-like anti-vibration member is attached. The vibration damping member is wound around the exhaust pipe and fixed by welding, and the vibration damping member is brought into close contact with the surface of the exhaust pipe. With these methods, the vibration damping member is pressed against the exhaust pipe to be in close contact. There is a problem that the adhesion ratio is low, and the original damping effect of the vibration damping member in which the thin metal linear body is braided cannot be sufficiently obtained.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to significantly improve the adhesion ratio of a vibration-damping member formed of a cloth-like material in which thin metal linear bodies are braided to an exhaust pipe, and thus to radiate the exhaust pipe. An object of the present invention is to provide a method for mounting a damper on an exhaust pipe that effectively reduces noise.

[0006]

DISCLOSURE OF THE INVENTION In order to achieve the above object, the present invention is directed to mounting an exhaust pipe damper in which a tubular vibration-damping member made of a cloth-like material in which thin metal linear bodies are braided is mounted on the surface of the exhaust pipe. In the method, after the vibration isolating member is heated and thermally expanded, the exhaust pipe is inserted into the vibration isolating member, and the vibration isolating member is welded to both ends of a straight tubular portion of the exhaust pipe, The vibration-proof member is cooled and shrunk to be in close contact with the surface of the exhaust pipe.

[0007]

The present invention is constructed as described above, and after the thermal damping of the vibration-proof member formed of the cloth-like material in which the thin metal linear body is braided, the exhaust pipe is inserted, and both ends of the straight pipe portion of the exhaust pipe are inserted. After welding the anti-vibration member to the portion, the anti-vibration member is cooled and shrunk to adhere to the surface of the exhaust pipe.Therefore, it is possible to attach the anti-vibration member to the exhaust pipe with a significantly high adhesion ratio while pressing the anti-vibration member. It will be possible.
As a result, even if the exhaust pipe resonates at a predetermined frequency, the metal linear body of the vibration-damping member that has a high adhesion rate is always effectively displaced following the vibration of the exhaust pipe, and the metal linear bodies come into contact with each other. It is possible to generate a high frictional force at the contact portion, and to effectively damp the vibration of the exhaust pipe by the friction, and to significantly reduce the radiation sound of the exhaust pipe.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a method for mounting a damper of an exhaust pipe according to the present invention, in which 1 is a straight pipe-shaped exhaust pipe connected to an engine or the like (not shown), and 2 is a cloth-like object in which a thin metal linear body 2a is braided. It is a cylindrical vibration damping member formed in. The damper mounting method for the exhaust pipe of the present invention can be performed as follows.

First, the cylindrical vibration damping member 2 is heated to be thermally expanded. Subsequently, as shown in FIG. 1A, the exhaust pipe 1 is inserted into the vibration-proof member 2 that has been thermally expanded. Figure 1 (b) after insertion
As shown in FIG. 2, both ends of the straight pipe-shaped exhaust pipe 1, that is, both end portions 2b of the vibration-damping member 2 corresponding to both ends 1a of the straight pipe portion are welded and fixed to the both ends 1a of the straight pipe portion. And
The vibration-damping member 2 welded to the exhaust pipe 1 is cooled and contracted, and is brought into close contact with the surface of the exhaust pipe 1.

By mounting the cylindrical vibration damping member 2 made of a cloth-like material in which the thin metal linear body 2a is braided on the surface of the exhaust pipe 1, the vibration damping member 2 is pressed against the exhaust pipe 1. It can be attached in a state where the contact rate is significantly increased. Therefore, even if the exhaust pipe 1 resonates at a predetermined frequency, the metal linear member 2a of the vibration isolating member 2 having a high adhesion ratio is constantly displaced in accordance with the vibration of the exhaust pipe 1, and the metal linear member is displaced. The vibration of the exhaust pipe 1 can be effectively damped by the high frictional force due to the mutual contact of the 2a.

FIG. 2 shows another embodiment of the present invention, in which a curved tubular exhaust pipe 1A is used in place of the straight tubular exhaust pipe 1 used in the above-described embodiment. Even when the curved exhaust pipe 1A is used, after the vibration damping member 2 is heated and thermally expanded, the exhaust pipe 1 is inserted into the thermally expanded vibration damping member 2 as shown in FIG. 2A. 2B, the curved portion and both ends of the bent pipe-shaped exhaust pipe 1A, that is, the location 2b of the vibration-damping member 2 corresponding to both ends 1a of the straight pipe-shaped portion of the exhaust pipe 1A, as shown in FIG. It is welded and fixed to both ends 1a of the straight tubular portion. Then, the vibration damping member 2 welded to the exhaust pipe 1A is cooled and shrunk to be brought into close contact with the surface of the exhaust pipe 1. Even with the curved exhaust pipe 1A, the same effects as described above can be obtained by the mounting method of the present invention.

In the above-described embodiment, the metal linear body 2a
Is made of a metallic wire or a thin band, and a steel wire or a thin steel band can be preferably used. As the braided structure of the metal linear bodies 2a, for example, a plurality of metal linear bodies 2a arranged in parallel and braided so as to be orthogonal to each other can be used, but the braided structure is not particularly limited thereto. The vibration-proof member 2 is attached to the exhaust pipe 1 so that the metal linear members 2a intersect in the opposite direction at the same angle with respect to the vibration transmission direction of the exhaust pipe 1, but the present invention is not limited to this. Absent. It is needless to say that the straight tubular portion may be a linear portion having a slight bend and does not always have to be a straight line.

[0013]

As described above, according to the present invention, the exhaust pipe is inserted after the vibration isolating member made of the cloth-like material in which the thin metal linear body is braided is thermally expanded and the exhaust pipe is inserted into both end portions of the straight tubular portion. After the vibration isolating member is welded to and then the vibration isolating member is cooled and shrunk so as to be brought into close contact with the surface of the exhaust pipe, the adhesion ratio of the vibration isolating member to the exhaust pipe can be significantly improved. Therefore, the metal linear body of the vibration isolating member is always effectively displaced in accordance with the vibration of the exhaust pipe, and the emission sound of the exhaust pipe can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for mounting a damper of an exhaust pipe of the present invention, (a) is an explanatory view showing a step of inserting the exhaust pipe into a heat-expanded vibration isolating member, and (b) is a vibration isolating to the exhaust pipe. It is explanatory drawing which shows the process of welding a member.

2A and 2B are explanatory views showing another embodiment of the exhaust pipe damper mounting method of the present invention, in which FIG. 2A is an explanatory view showing a step of inserting the exhaust pipe into a heat-expanded vibration isolating member, and FIG. It is explanatory drawing which shows the process of welding a vibration isolator to an exhaust pipe.

[Explanation of symbols]

1, 1A Exhaust pipe 1a Straight tubular portion both ends 2 Anti-vibration member 2a Metal linear body

Claims (1)

[Claims] 1. A method of mounting a damper for an exhaust pipe, wherein a tubular vibration-damping member formed of a cloth-like material in which a thin metal linear body is braided is mounted on the surface of the exhaust pipe by heating the vibration-damping member. After thermal expansion, the exhaust pipe is inserted into the vibration isolating member, and the vibration isolating member is welded to both ends of a straight tubular portion of the exhaust pipe,
A method for mounting an exhaust pipe damper, which cools and contracts the vibration isolating member to adhere to the surface of the exhaust pipe.