JPH0124326Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a muffler used in engines of automobiles, motorcycles, etc.

Conventionally, there are various types of mufflers that reduce engine exhaust noise, but this idea has a cylindrical body with multiple small holes drilled inside the muffler body, and the peripheral wall inside the muffler body and the cylindrical body This invention relates to an improvement in a muffler having a structure in which a sound absorbing material is filled between the muffler and the muffler. Conventionally, this type of muffler has a cylindrical body with a plurality of small holes, and a rope-like wire made of a bundle of thin metal wires is spirally wound around the outer periphery of the cylindrical body. was introduced into the sound absorbing material through the small holes and the gaps between the rope-like wires to muffle the sound. For this reason, during use, suspended matter such as carbon in the exhaust air often gets stuck in the gaps between the rope-shaped wires, reducing the sound-dampening effect.

The purpose of this invention is to provide a muffler that overcomes the drawbacks of the conventional example and provides a good silencing effect, and the silencing effect does not deteriorate during use.

The feature of this invention is that a coiled wire, which is made by winding a thin metal wire into a coil, is wound spirally around the outer surface of a cylinder with a plurality of small holes in the side.

Embodiments of this invention will be described below with reference to the drawings.

1 is the muffler body, and the exhaust introduction pipe 2 is in front of it.
is installed, and two exhaust pipes 3, 3 are installed at the rear. Inside the muffler body 1, two cylindrical bodies 4, 4 are provided. One end of these cylindrical bodies 4, 4 is connected to the exhaust introduction pipe 2 after being joined inside the muffler main body 1, and the other end is connected to the two exhaust pipes 3, 3, respectively.

On the sides of the cylinders 4, 4, as shown in Fig. 3,
A large number of small holes 5 are bored, and an exhaust passage 6 is formed inside the holes 5.
It is said that Furthermore, a coiled wire 7 made of a thin metal wire wound into a coil is spirally wound around the outer periphery of the wire. In this embodiment, the coiled wire 7 is made by winding a thin band-shaped metal wire with a rectangular cross section into a coil having a diameter of several mm. The coiled wire 7 produced in this manner is spirally wound around the entire outer surface of the cylinder body 4 except for the connecting portions between the exhaust gas introduction pipe 2 and the exhaust pipe 3 at both ends. Therefore, all the small holes 5 of the cylinder 4 are covered with the coiled wire 7, and a spiral space is formed around the outer periphery of the cylinder 4.

Between the inner circumferential wall of the muffler body 1 and the cylindrical body 4,
A sound absorbing material 8 made of glass fiber such as glass wool is filled.

Next, the usage condition of the muffler according to this invention will be explained.

Exhaust discharged from an engine (not shown) of an automobile or the like passes through an exhaust introduction pipe 2 to a muffler body 1.
It is guided to two cylindrical bodies 4, 4 provided inside. Then, at the same time as it is diffused in the exhaust passages 6, 6 of the cylinders 4, 4, a part of the air is diffused into the cylinders 4 through the small holes 5 of each cylinder 4.
It flows out to the outside and further reaches the sound absorbing material 8 through the spiral space formed inside the coil wire 7. Then, since the sound absorbing material 8 absorbs the exhaust sound,
A good sound deadening effect can be obtained. The exhaust gas that has been muffled in the exhaust passage 6 is discharged into the atmosphere through the two exhaust pipes 3, 3.

In this invention, since the coiled wire 7 is wound around the outer surface of the cylindrical body 4, the gap between the wires is larger than that of a conventional rope-shaped wire, and there is also a spiral between the cylindrical body 4 and the sound absorbing material 8. A shaped space is formed. Therefore,
The exhaust gas flowing out of the cylinder 4 through the small holes 5 can easily reach the sound absorbing material 8 through the gaps between the wire rods, and also reaches the sound absorbing material 8 while being diffused within the spiral space. , the noise reduction effect is improved, and floating substances such as carbon in the exhaust gas are less likely to get stuck between the wires.

This device has the above-mentioned configuration, and has excellent practical effects, such as having a good noise-damping effect and not reducing the sound-damping effect due to the adhesion of floating objects in the exhaust gas during use. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the muffler according to this invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 3 is a perspective view of a cylinder around which a coiled wire is wound. 1...Muffler body, 2...Exhaust introduction pipe, 3...
... Exhaust pipe, 4 ... Cylindrical body, 5 ... Small hole, 6 ... Exhaust passage, 7 ... Coiled wire, 8 ... Sound absorbing material.

Claims (1)

[Scope of utility model registration request] An exhaust introduction pipe 2 is attached to the front part of the muffler body 1, and an exhaust pipe 3 is attached to the rear part, and a cylindrical body 4 with a plurality of small holes 5 bored on the side is provided inside the muffler body 1. Both ends of the cylindrical body 4 are connected to the exhaust introduction pipe 2 and the exhaust pipe 3, respectively, and a coiled wire 7 made of a thin metal wire wound in a coil shape is wound helically on the outer surface of the cylindrical body 4. , a muffler characterized in that a sound absorbing material 8 is further filled between the inner circumferential wall of the muffler main body 1 and the cylinder body 4.