JP2853360B2 - Exhaust heat shield - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat shield provided in an exhaust system of an automobile, and more particularly to an exhaust heat shield holding a sound absorbing material such as glass wool.

[0002]

2. Description of the Related Art In an exhaust system of an automobile, exhaust gas from an engine is guided to the outside, cooled, purified, and exhausted. At that time, it is required to insulate other vehicle parts and the like. Is done. Therefore, for example, a heat shield is connected to the exhaust pipe via a heat-resistant sound absorbing material such as glass wool.

As this type of exhaust heat shield, there is, for example, one shown in FIG. In the figure, 1 is an exhaust pipe, 2A and 2B are heat shield plate bodies vertically opposed to each other across the exhaust pipe 1, and 3A and 3B are interposed between the exhaust pipe 1 and the heat shield plate bodies 2A and 2B. It is glass wool that has been made. The glass wools 3A and 3B are bonded to the heat shield plate main bodies 2A and 2B by an adhesive (not shown). Further, the heat shield plate main bodies 2A, 2B are connected in a tubular shape by a plurality of connecting members 4 such as screws, and at the time of the connection, the glass wools 3A, 3B come into close contact with the exhaust pipe 1 so that the exhaust pipe 1 Is to be held.

[0004]

However, in such a conventional exhaust system heat shield, glass wool 3
A and 3B are bonded to the heat shield main bodies 2A and 2B, and when the heat shield main bodies 2A and 2B are combined, the exhaust pipe 1 is brought into close contact with and held by the glass wools 3A and 3B. Heat shield plate body 2A, 2
There is a problem in that the workability of the glass wool 3A, 3B is impaired, and the glass wool 3A, 3B is easily scattered.

Accordingly, the present invention provides a sound absorbing material, such as glass wool, which is wrapped by a metal net member, thereby holding the sound absorbing material on the net member and reducing the contact area of the sound absorbing material with an exhaust pipe. The object of the present invention is to facilitate the work of attaching the sound absorbing member to the heat shield plate body and to improve the durability of the sound absorbing material.

[0006]

SUMMARY OF THE INVENTION The present invention provides a heat shield plate body provided so as to cover a part of an exhaust pipe, and a heat shield plate body attached to the heat shield plate body. An intervening heat-resistant sound-absorbing material, and an exhaust system heat-insulating plate, comprising: a metal net member wrapped around the heat-resistant sound-absorbing material and fixed to the heat insulating plate main body; The exhaust pipe is partially contacted to form a gap between the two.

[0007]

According to the present invention, the metal net member enclosing the sound absorbing material and fixed to the heat shield plate body partially contacts the exhaust pipe, and a gap is formed between the two. Therefore, the sound absorbing material is held by the mesh member, the contact area of the sound absorbing material with the exhaust pipe is reduced, and the durability of the sound absorbing material is improved. Further, by attaching the net member to the heat shield main body, the work of attaching the sound absorbing material to the heat shield main body is facilitated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 are views showing a first embodiment of an exhaust system heat shield according to the present invention. In both figures, 11 is an exhaust pipe, 12A, 12
B is a heat shield main body, and 13A and 13B are glass wools interposed between the exhaust pipe 11 and the heat shield main bodies 12A and 12B. The exhaust pipe 11 is connected at one end to an exhaust manifold of an engine (not shown), and discharges combustion exhaust gas of the engine to the outside air from the other end. The heat shield plate bodies 12A and 12B are vertically opposed to each other with the exhaust pipe 11 interposed therebetween, and are provided so as to cover a part of the exhaust pipe 11. The heat shield plate bodies 12A and 12B have a plurality of heat shield plate bodies 12A and 12B. A small hole 14 is formed. In addition, the heat shield plates 12A, 12B
Are a plurality of connecting members (eg, screw members) at both ends of each other
They are joined by 18 to form a tubular body in that state.
Glass wool 13A, 13B is the exhaust pipe 11 and the heat shield plate body
It is a heat-resistant sound-absorbing material interposed between 12A and 12B.

The glass wools 13A and 13B are surrounded by metal net members 15A and 15B made of, for example, stainless steel or another metal (preferably a corrosion-resistant metal). For example, FIG.
At a plurality of locations S11, S12, S13, and S14 as shown in FIG. 7A, they are fixed to the heat shield plate bodies 12A and 12B by spot welding or the like. Further, the net members 15A, 15B are bent in a substantially W-shaped cross section so as to partially come into contact with the exhaust pipe 11 and the heat shield plate bodies 12A, 12B, respectively, whereby the exhaust pipe 11 and the glass wool 13A are bent. , 13B, two clearance spaces 16A, 16A extending in the axial direction of the exhaust pipe 11.
B is formed, and two gap spaces 17A, 17B are also formed between the heat shield plate bodies 12A, 12B and the glass wools 13A, 13B.

In this embodiment having such a structure, the net member 15 enclosing the glass wools 13A and 13B is used.
A and 15B partially contact the exhaust pipe 11 to form gaps 16A and 16B therebetween. Therefore, the contact (heat transfer) area of the glass wool 13A, 13B with the exhaust pipe 11 is reduced, and the glass wool 13A, 13A,
Vibration or the like is not directly transmitted to 13B, and scattering of glass wools 13A and 13B is prevented. As a result,
Glass wool 13A, 13A against high heat from exhaust pipe 11
The durability (heat resistance) of B is improved. In addition, the net member 15A,
Since 15B can be attached to the heat shield main bodies 12A, 12B by a simple fixing method such as spot welding, the glass wools 13A, 13B can be very easily attached to the heat shield main bodies 12A, 12B. Further, since the heat shield plate bodies 12A and 12B have a plurality of (many) small holes 14, the heat radiation from the exhaust pipe 11 to the outside is further improved,
The durability of the glass wools 13A and 13B is further improved.

FIG. 3 is a sectional view showing a second embodiment of the exhaust heat shield according to the present invention. Since the main configuration of the second embodiment may be the same as that of the first embodiment, only different configurations will be described with reference to FIG. In the figure, 22A,
22B is a heat shield plate body provided so as to cover a part of the exhaust pipe 11, and 25A and 25B are net members surrounding the glass wools 13A and 13B. Here, the mesh members 25A, 25B form gaps 26A, 26B with the exhaust pipe 11, and also form gaps 27A, 27B with the heat shield plate main bodies 22A, 22B. Specifically, protrusions 28A and 28B are formed on the heat shield plate bodies 22A and 22B so as to protrude outward from the heat shield plate bodies 22A and 22B.
Net member 25 fixed to the inner peripheral side of heat shield plate main bodies 22A, 22B
A, 25B and the inner wall of both projecting portions 28A, 28B
A and 27B are partitioned. The mesh members 25A, 25B
Are spot-welded to the heat shield plate main bodies 22A and 22B at a plurality of circumferential positions indicated by S21, S22, S23 and S24 in the figure, for example.

In this embodiment, the same effects as in the first embodiment can be obtained. Further, since the shapes of the net members 25A and 25B are simplified, the manufacturing cost is reduced. FIG. 4 is a sectional view showing a third embodiment of the exhaust heat shield according to the present invention. The main configuration of the third embodiment is the same as that of the first embodiment.
Since the configuration may be the same as that of the embodiment, only different configurations will be described with reference to FIG.

In FIG. 1, reference numerals 35A and 35B denote wavy net members which enclose the glass wools 13A and 13B and form a plurality of irregularities in the radial direction (not necessarily continuous in the axial direction of the exhaust pipe 11). And the net member 35
A and 35B form a plurality of gaps 36 with the exhaust pipe 11 and also form a plurality of gaps 37 with the heat shield plate bodies 12A and 12B. And this net member 35A, 35B
Are spot-welded to the heat shield plate bodies 12A and 12B at a plurality of circumferential positions indicated by, for example, S31, S32, S33 and S34 in the figure.

In this embodiment, the same effects as those of the above embodiments can be obtained. Further, the mesh members 35A, 35A
B is formed in a wavy shape and the exhaust pipe 11 has a small contact area.
Glass wool 13A, 13B
Can sufficiently exhibit the sound absorbing effect.

[0015]

According to the present invention, the sound absorbing material is wrapped by the metal net member fixed to the heat shield main body, and the net member is partially brought into contact with the exhaust pipe to form a gap therebetween. As a result, the contact area of the sound absorbing material with the exhaust pipe can be reduced and the durability of the sound absorbing material can be improved, and the heat insulating plate of the sound absorbing material can be attached by attaching the net member to the heat insulating plate body. The work of attaching to the main body can be made extremely easy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of an exhaust heat shield according to the present invention.

FIGS. 2A and 2B are views showing an exhaust heat shield of one embodiment, wherein FIG. 2A is a cross-sectional view thereof, and FIG. 2B is a perspective view of a mesh member thereof.

FIG. 3 is a sectional view showing a second embodiment of the exhaust heat shield according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the exhaust heat shield according to the present invention.

FIG. 5 is a perspective view of an example of a conventional exhaust heat shield.

[Explanation of symbols]

 11 Exhaust pipe 12A, 12B, 22A, 22B Heat shield main body 13A, 13B Glass wool (heat-resistant sound absorbing material) 15A, 15B, 25A, 25B, 35A, 35B Mesh members 16A, 16B, 26A, 26B, 36 Gap

Claims (1)

(57) [Claims] 1. A heat shield plate body provided to cover a part of an exhaust pipe, a heat-resistant sound absorbing material attached to the heat shield plate body and interposed between the exhaust pipe and the heat shield plate body. And a metal mesh member wrapped around the heat-resistant sound absorbing material and fixed to the heat shield plate main body, and partially contacting the mesh member with the exhaust pipe. An exhaust heat shield plate wherein a gap is formed between the two.