JP3146137B2 - Insulator for exhaust system of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in an insulator used for an exhaust system of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as an insulator for cutting off heat and noise emitted from an exhaust system such as an exhaust manifold or an exhaust pipe, a covering member made of one or two steel plates, and a heat insulating material or a resin are used. 2. Description of the Related Art A cover member formed by press-molding between two members is known.

FIG. 6 shows an example of the structure of an exhaust manifold insulator. In the figure, 1 is an engine cylinder head, 2 is an exhaust manifold, 3 is an insulator having a single steel plate as a cover member, and one end of the cover member 3 is fixed to the manifold side.

FIG. 7 shows a structural example of an exhaust pipe insulator. In the figure, reference numeral 4 denotes an exhaust pipe, and 5 denotes an insulator having a pair of half-cylinder portions 5a, 5a formed by pressing a steel plate into a half-cylindrical shape, and the insulator half-cylinder portions 5a, 5a.
The flanges are opposed to each other with a flange 4a provided on the exhaust pipe side as a center, and are integrally connected by bolts and nuts (not shown).

[0005]

In recent years, as automobiles have become lighter, the thickness of exhaust system components such as exhaust manifolds and exhaust pipes of internal combustion engines has become thinner, and the noise emitted from the exhaust system has increased. Are also increasing. Further, noise regulations and exhaust gas regulations in domestic and foreign countries (particularly in the United States and Europe) are becoming stricter, and it is becoming more difficult for conventional insulators to comply with the regulations.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problem, and has as its main object to provide an insulator for an exhaust system of an internal combustion engine capable of significantly improving sound absorption and heat insulation functions.

[0007]

According to the present invention, there is provided an insulator for an exhaust system of an internal combustion engine according to the present invention, comprising: a metal cover member; a mat member made of inorganic fibers adhered to the inside of the cover member; An inorganic heat-resistant cloth member bonded to the cover member and a mat member provided at an edge of the cover member.
After protruding longer, turn it back to form a double flange
And bending the tip of the folded part into a key shape
With the protrusions made, the outer periphery of the mat member via the cross member
Assembled by the clinch mechanism that was pressed
The gist is an integrated configuration.

The cover member is preferably made of a steel plate, but not limited thereto, and various metal materials such as stainless steel and aluminum alloy can be arbitrarily selected and used. Examples of the inorganic fiber mat portion include glass fiber, silica fiber, and ceramic fiber. It is preferable to use a glass cloth or a silica cloth for the inorganic heat-resistant cloth member.

[0009]

1 to 3 show an example of an exhaust manifold insulator. In the figure, 1 is a cylinder head of an engine, 2 is a manifold, and an insulator A is a cover member 10 made of a steel plate, a mat member 11 made of glass fiber bonded inside the cover member 10, and a mat member and a cross member 12 made of glass fibers bonded together in 11 surface, covering described later
It has a structure that is integrated by assembling it with a clinch mechanism using the edges of the members . In the above configuration, the covering member 10 has a heat shielding function as in the conventional insulator. On the other hand, the mat member performs a sound absorbing function,
The cloth member has a function of preventing the fibers of the mat member from scattering and collapsing.

[0010]

1 to 3 show an embodiment in which the present invention is applied to an exhaust manifold. The same or similar members as those in FIG. 4 are denoted by the same reference numerals. 1 and 2, reference numeral 1 denotes a cylinder head of an engine, 2 denotes a manifold, and an insulator A is a cover member 1 made of a steel plate.
0, a mat member 11 made of glass fiber adhered to the inside of the cover member 10, and a cross member 12 made of glass fiber adhered to the surface of the mat member 11.

[0011] In the above embodiment, the covering member 10, the leading end of the folded portion of the flange portion 10a so as to form after folding a double flange portion 10a which projects long its edge outward from the mat member 11 The mat member 1 is formed via a cross member 12 with a projection 10b formed by bending into a key shape.
1, a covering member 10, a mat member 11, and a cross member 1
2 and are integrated. This way,
The mat member 11 and the cross member 12 can be assembled and integrated at the time of pressing the cover member 10 without using a special mounting tool, and the scattering of the fibers due to the exposed end surface of the mat member 11 is reliably prevented. can do.

Further, a cross-shaped washer B shown in FIGS. 2 and 3 (a) and (b) is used for a portion of the mat member 11 stuck to the cover member 10 where a slack is likely to occur. The washer B is fixed by spot welding from the outside of the cross member 12 to the pedestal C previously fixed to the inside, and the cross-shaped washer B prevents the mat member from sagging via the cross member. FIG. 4 shows another example of a slack preventing structure using the cruciform washer B. In this example, the cruciform washer B is bent in a concave shape with four arms, and the mat member 11 is partially cut out from a round hole formed in the cross member 12 so as to enter a space, and the center of the washer is inserted. The portion is fixed to the cover member 10 by spot welding to prevent the mat member from sagging at the tip of the arm portion.

In the conventional insulator, a heat insulating and sound insulating function is provided by a covering member made of a steel plate. However, according to the configuration of the above embodiment, the inner surface of the covering member 10 facing the surface where sound and heat are generated is provided. Since the mat member 11 made of inorganic fiber is bonded and the cloth member 12 made of inorganic fiber is bonded to the surface of the mat member 11, the fiber mat member 11 has an excellent sound absorbing function, and the fiber of the mat member Can be prevented by the cross member.

FIG. 5 shows an example in which the present invention is applied to an exhaust pipe. Note that members that are the same as or similar to those in FIGS. 7 and 1 are denoted by the same reference numerals. That is, 4 is an exhaust pipe, 4
a is a flange part provided in a part thereof. A 'is an insulator, 13 and 13 are a pair of half-cylinder parts formed by press-forming a steel plate into a half-cylinder shape, 14 is a mat member made of glass fiber bonded to the inside of the half-cylinder part, and 15 is bonded to the mat member surface. A cross member made of glass fiber, 13a is a double flange portion which is formed by protruding the edge of the semi-cylindrical portion outward from the mat member and then is folded, and 13b is a projection which is formed by bending the tip of the folded portion of the flange into a key shape. The half-cylinder portion 13, the mat member 14, and the cross member 15 are assembled and integrated by a clinch mechanism using the projections. Even in the configuration of the exhaust pipe insulator, the same sound absorbing and heat insulating functions as those of the manifold insulator can be obtained.

[0015]

As described above in detail, according to the present invention, it is possible to obtain an insulator having both a heat insulating function and an excellent sound absorbing function in terms of the function of an exhaust system insulator for an internal combustion engine. In addition, the exhaust system insulator according to the present invention is a metal covering member as a component,
Since the fiber mat member having the sound absorbing function and the cloth member for preventing scattering of the fibers of the mat member are integrated, the fiber mat member can be easily attached to the exhaust system.

Further, the edge of the metal covering member is protruded outward from the mat member so as to protrude longer than the mat member, and then is folded to form a double flange portion, and the tip of the folded portion is bent in a key shape to form a cross. With a structure integrated by a clinch mechanism that presses the outer periphery of the mat member through the member, the mat member and the cross member can be assembled and integrated when pressing the cover member without using special mounting tools. And the scattering of the fibers due to the exposed end surface of the mat member can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an exhaust manifold insulator showing one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view including an insulator clinch mechanism portion and a slack preventing structure portion of a mat member.

FIG. 3 is a plan view and a side view of a cruciform washer used for a slack preventing structure of a mat member.

FIG. 4 is a cross-sectional view showing another example of a sag preventing structure of a mat member.

FIG. 5 is a longitudinal sectional view of an exhaust pipe insulator showing another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional insulator for an exhaust manifold.

FIG. 7 is a longitudinal sectional view of a conventional exhaust pipe insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head of engine 2 Exhaust manifold 3 Insulator 4 Exhaust pipe 4a Flange part 5 Covering member forming insulator A Insulator for exhaust manifold 10 Covering member 10a Flange part 10b Projection 11 Mat member 12 Cross member B Cross washer C Pedestal A 'Exhaust pipe insulator 13 Half cylindrical portion 13a Flange portion 13b Projection 14 Mat member 15 Cross member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 51-71424 (JP, U) Japanese Utility Model Utility Model Hei 2-3732 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F01N 7/14 F01N 7/10 F01N 7/16 F02B 77/11 F02B 77/13

Claims (3)

(57) [Claims] 1. A metal cover member, and a metal cover member
A mat member made of inorganic fiber attached to the side
Inorganic heat-resistant cloth bonded to the surface of the mat member
Material, the edge of the covering member is extended outside the mat member.
And then folded to form a double flange
And bent the tip of the folded part into a key shape
Press the outer periphery of the mat member via the cross member with the projection
Assembled and integrated with clinch mechanism
Insulation for an exhaust system of an internal combustion engine, characterized in that
Data. 2. An exhaust manifold for covering said cover member with an exhaust manifold.
Molded into a shape to obtain
A mat member made of the mixed inorganic fiber and the mat portion
The inorganic heat-resistant cloth member attached to the surface of the material
By clinch mechanism, assembled and integrated
An exhaust system for an internal combustion engine according to claim 1, wherein
Ta. 3. A pair of cover members which can cover an exhaust pipe.
Formed as a semi-cylindrical part, bonded to the semi-cylindrical part and inside
A mat member made of the mixed inorganic fiber and the mat portion
The inorganic heat-resistant cloth member attached to the surface of the material
By clinch mechanism, assembled and integrated
An exhaust system for an internal combustion engine according to claim 1, wherein
Ta.