JPH0337317A - Muffler - Google Patents

Abstract

PURPOSE:To improve the sound absorbing characteristic and heat resistance by forming a cylindrical sound arresting member chamber which communicates to an exhaust passage on the outer periphery of the exhaust passage and arranging a composite sound arresting member having a ceramics material at least on one part of the inside of the sound arresting member chamber. CONSTITUTION:As for a muffler 2 interposed midway in an exhaust pipe 4, a cylindrical inside member 8 having a number of small holes 6 drilled and a cylindrical outside member 10 having a diameter larger than that of the inside member 8 are arranged concentrically, and the annular edge members 12 and 14 are fixedly installed at the both edges. A muffler side exhaust passage 16 is formed inside the inside member 8, and a cylindrical sound arresting material chamber 18 which communicates to the part between the inside and outside members 8 and 10 on the outer periphery of the passage 16 through the small holes 6 is formed. Further, inside the sound arresting material chamber 18, a composite sound arresting member 22 is arranged. Further, at least one member of the composite sound arresting member 22 is made of ceramics material 24, and staineless steel material 26 and glass material 28 are arranged on the both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a muffler, and more particularly to a muffler that can enhance the muffling effect of exhaust noise from an exhaust gas discharging device and improve its durability.

[Conventional technology]

In devices that emit exhaust gas, the exhaust gas is emitted to the outside through a muffler in order to reduce exhaust noise.For example, in an internal combustion engine, a muffler is installed in the middle of the exhaust pipe. It has been installed to reduce exhaust noise. A muffler has an expansion chamber or a muffling material chamber on the outer periphery of an exhaust passage through which exhaust gas flows, and uses the expansion space of the expansion chamber and the muffling material inside the muffler chamber to attenuate the exhaust energy through interference and friction, thereby reducing exhaust noise. It is being reduced.

[Problem that the invention seeks to solve]

By the way, in conventional silencers, a fibrous stainless steel material (stainless wool), a fibrous glass material (glass wool), or the like is used as a sound deadening material in a sound deadening material chamber.

However, although the stainless steel material used as a sound deadening material has excellent heat resistance, it has poor sound absorbing properties, resulting in a disadvantage that the sound deadening effect is low.

On the other hand, glass materials have excellent sound absorption properties, but are inferior in heat resistance, resulting in a disadvantage of low durability.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize a muffler that can enhance the silencing effect of exhaust noise from a device that emits exhaust gas and improve its durability.

[Means for solving problems]

In order to achieve this object, the present invention provides a cylindrical sound-dampening chamber communicating with the exhaust passage on the outer periphery of the exhaust passage through which exhaust gas flows, a composite sound-dampening material is disposed within the sound-dampening material chamber, and the composite It is characterized in that at least one material of the sound deadening material is made of a ceramic material.

[Effect]

According to the configuration of the present invention, at least one material of the composite sound deadening material disposed in the sound deadening material chamber is made of a ceramic material, so that the ceramic material has low thermal conductivity, excellent heat resistance, and sound dispersion. Sound absorption and heat resistance can be improved through the synergistic effect of its excellent properties and the properties of other materials.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of the invention.

In the figure, 2 is a silencer. The muffler 2 is interposed in the middle of an exhaust pipe 4 of an internal combustion engine (not shown). The muffler 2 has a cylindrical inner member 8 formed with a large number of small holes 6 and a cylindrical outer member 10 having a larger diameter than the inner member 8, which are arranged concentrically. Annular edge members 12 and 14 are fixed to both axial ends of the outer member 10 and the outer member 10 by crimping, welding, or the like. As a result, the silencer 2
A muffler-side exhaust passage 16 through which exhaust gas flows is provided in the inner member 8, and a cylindrical noise-reducing member is provided with a small hole 6 communicating between the inner member 8 and the outer member 10 on the outer periphery of the muffler-side exhaust passage 16. An attached room 18 is provided. The muffler side exhaust passage 16 is provided to communicate with the exhaust pipe side exhaust passage 20 of the exhaust pipe 4.

Furthermore, a composite sound-dampening material 22 is disposed within the sound-dampening chamber 18. At least one material of this composite sound deadening material 22 is a ceramic material 24.

That is, in this embodiment, the composite sound deadening material 22 includes a cylindrical fibrous stainless steel material (stainless wool) 26 in the innermost layer, and an intermediate layer in order from the inner member 8 side to the outer member 10 side. The ceramic material 24 is formed into a cylindrical shape by foaming, and the outermost layer is a fibrous glass material (glass wool) 28 formed into a cylindrical shape.

In addition, in this example, the ceramic material 24 is
It is divided into a plurality of cylindrical shapes, each having an annular plate-shaped glass material 30 interposed at both ends in the axial direction to form a cylindrical shape having a required length.

Further, the outermost glass material 28 may be a cylindrical fibrous carbon material (carbon wool).

The muffler 2 configured in this manner is interposed in the middle of an exhaust pipe 4 of an exhaust gas discharging device (not shown), for example, an internal combustion engine. When the exhaust gas emitted from the internal combustion engine flows from the exhaust pipe side exhaust passage 20 into the muffler side exhaust passage 16 of the muffler 2, the energy of the exhaust propagates from the small hole 6 into the muffler chamber 18 and the composite muffler material 22. is attenuated by At this time, at least one material of the composite sound deadening material 22 is replaced with the ceramic material 24.
By configuring this ceramic material 24
Due to its low thermal conductivity, excellent heat resistance, and excellent sound dispersion properties, it can improve sound absorption and heat resistance.

Furthermore, the composite sound deadening material 22 is composed of an innermost layer of stainless steel material 26 and an outermost layer of glass material 28 as other materials. Due to the synergistic effect of the sound absorption properties and the characteristics of the ceramic material 24, the sound absorption properties and heat resistance can be further improved.

For this reason, it is possible to enhance the silencing effect of the silencer 2 and to improve heat resistance.

Note that FIG. 2 shows a modification in which the muffler 2 of the present invention is provided at the discharge end 32 of the exhaust pipe 4.
By separately forming the muffler 2 into a single structure, it can be easily attached and assembled to the existing exhaust pipe 4, which is advantageous in practice.

〔Effect of the invention〕

As described above, according to the present invention, at least one material of the composite sound deadening material disposed in the sound deadening material chamber is made of a ceramic material, so that the ceramic material has a low thermal conductivity, is excellent in heat resistance, and has excellent sound resistance. Due to its excellent dispersibility, it can improve sound absorption and heat resistance, and furthermore, the synergistic effect with the characteristics of other materials can further improve sound absorption and durability.

Therefore, the silencing effect of the silencer can be enhanced and the durability can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a silencer showing an embodiment of the invention. FIG. 2 is a sectional view of a muffler showing a modification of the invention. In the figure, 2 is a silencer, 4 is an exhaust pipe, 6 is a small hole, 8 is an inner member, IO is an outer member, 12 and 14 are edge members, 1
6 is an exhaust passage on the muffler side, 18 is a room with a muffling device, 20 is an exhaust passage on the exhaust pipe side, 22 is a composite sound deadening material, 24 is a ceramic material, 26 is a stainless steel material, and 28 is a glass material.

Claims (1)

[Claims] 1. A cylindrical sound deadening material chamber communicating with the exhaust passage is provided on the outer periphery of the exhaust passage through which exhaust gas flows, a composite sound deadening material is arranged within the sound deadening material chamber, and at least one material of the composite sound deadening material is made of ceramic. A silencer characterized by being constructed from a material.