Heat and sound insulation device

Details Heat and sound insulation device Heat and sound insulation device

1984-11-08

1986-07-08

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181272, F01N 110

Patent

active

045987904

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a heat and sound insulation device for use in a high-temperature exhaust passage such as an exhaust pipe for an internal combustion engine.


BACKGROUND ART

So-called mufflers are connected to exhaust pipes for reducing the noise of an exhaust gas discharged from a heat source such as an internal combustion engine in which the exhaust pressure widely varies. As shown in FIGS. 17 and 18, one conventional muffler is constructed of an outer muffler panel (91), filamentary glass fibers (92) attached to an inner surface of the outer muffler panel (91), and punched panels (93) held against inner surfaces of the glass fibers to hold the glass fibers. This construction is poor in heat insulation since the punched panels (93) which is a good thermal conductor and the outer muffler panel (91) are held in contact with each other through wide areas (94).
As shown in FIG. 19, there has been proposed a muffler for being mounted on a motorcycle engine which has a small displacement, the muffler comprising a silencer (96) made of glass fibers baked and pressed into a mat with an organic binder and attached to an inner surface of an outer panel (95). Since the binder is organic, the proposed muffler is of poor heat resistance. The heat resistance has been improved by employing an inorganic binder. However, the muffler is disadvantageous in that the silencer (96) has a low density of 150 Kg/m.sup.3, the glass fibers are joined together with small binding forces, the surfaces of the glass fibers of the silencer tend to split finely due to an exhaust gas flow, resulting in poor durability and an increased resistance to the exhaust gas flow thereby to impair the exhaust gas inertia.


Disclosure of the Invention:

The present invention has been made in an effort to eliminate the above difficulties with the heat and sound insulation device of the type in which glass fibers are attached to an inner wall.
It is an object of the present invention to provide a heat and sound insulation device in which fibers are joined with strong binding forces, and which is highly heat-resistant and durable.
To achieve the above object, a heat and sound insulation material is exposed on the surface of an inner surface of an exhaust passage, and comprises a laminated body composed of elongate glass fibers with fibrous ceramic mixed therewith.
Embodiments of the present invention will hereinafter be described in detail with reference to the accompanying drawings. Specific constructions and advantages of the present invention will be understood from the description of the invention.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal cross-sectional view of a muffler for an internal combustion engine according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line 2--2 of FIG. 1;
FIG. 3 is a diagram showing the relationship between a ceramic fiber mixture ratio and a scattering resistance ratio of a heat and sound insulation material;
FIG. 4 is a diagram illustrative of the relationship between a ceramic fiber mixture ratio and a heat resistant temperature of the heat and sound insulation material;
FIG. 5 is a fragmentary longitudinal cross-sectional view of a modification;
FIG. 6 is a longitudinal cross-sectional view of a second embodiment;
FIG. 7 is an enlarged cross-sectional view taken along line 7--7 of FIG. 6;
FIG. 8 is an enlarged cross-sectional view taken along line 8--8 of FIG. 6;
FIG. 9 is a longitudinal cross-sectional view of a third embodiment;
FIG. 10 is a cross-sectional view taken along line 10--10 of FIG. 9;
FIG. 11 is a cross-sectional view taken along line 11--11 of FIG. 10;
FIG. 12 is an exploded perspective view of the muffler according to the third embodiment;
FIG. 13 is a longitudinal cross-sectional view of a fourth embodiment;
FIG. 14 is a cross-sectional view taken along line 14--14 of FIG. 13;
FIG. 15 is a longitudinal cross-sectional view of a fifth embodiment;
FIG. 16 is a cross-sectional view taken along line 16--16

REFERENCES:
patent: 3233697 (1966-02-01), Slayter et al.
patent: 4015683 (1977-04-01), Williams
patent: 4192402 (1980-03-01), Nakagawa et al.
patent: 4234054 (1980-11-01), Chapin
patent: 4332307 (1982-01-01), Ito
patent: 4456091 (1984-06-01), Blanchok

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