JP2934573B2 - Automotive muffler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a motor vehicle, and more particularly to an improvement of a muffler provided at a rear portion of an exhaust pipe of a vehicle for traversing a river or a puddle.

[0002]

2. Description of the Related Art In a conventional vehicle which crosses a river having a water level of 800 mm or more in water depth, a head difference is provided between an exhaust pipe in an engine room and a vehicle to prevent water from entering through a rear opening of the exhaust pipe. Are provided specially for forming a trap. However, in the system in which the head difference is provided in the engine room, a new device is provided in a place where there is essentially no space, so that the space is inevitably difficult. Therefore, it is conceivable to bring such a trap portion or the like into, for example, a rear wheel house.

[0003]

Therefore, a case where the above-described trap portion or the like is installed in the wheel house 9 of the rear wheel as shown in FIG. 4 will be considered. In this case, the space of the rear wheel house (rear wheel house) 9 is also limited. Therefore, when the trap portion 10 is to be stored in the rear wheel house 9 having a limited space, the trap portion 10 must be bent so as to have an extremely small radius of curvature. In particular, since the exhaust pipe is formed of a cylindrical pipe, if the bending is performed integrally with a small radius of curvature, the cross-sectional area of the exhaust pipe must be reduced. For this reason, as shown in FIG.
The front and rear portions 20 and 30 connected to the U-shaped forming portion (trap portion) 10 are formed as separate parts, and these are joined by welding or are connected by bolts and nuts at the flange portion. Or the like. To solve such problems,
It is an object (problem) of the present invention to provide an automotive muffler having a simple trap portion.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, a large-diameter muffler for an automobile, which is provided near the rear end of the exhaust pipe and has a trap portion having a predetermined head difference (H) with respect to the lowest portion of the exhaust pipe. An outer shell having an inlet port connected to an exhaust pipe at a lower portion thereof, and an outer shell housed inside the outer shell, and a distal end portion thereof near an upper end surface of the outer shell. And a tail pipe installed at a position lower than the upper end face. Further, the upper end face of the outer shell is sealed with a cap, and the lower end face of the outer shell has a ring shape between the tail pipe and the tail pipe. It was decided to adopt a configuration sealed with a cap.

[0005]

According to the present invention, the following effects are exhibited in the present invention. That is, in FIG. 2, the exhaust gas discharged from the engine side is introduced into the cylindrical outer shell 1 from the inlet port 13 through the exhaust pipe 5. Incidentally, a tail pipe 2 forming the rear end of the exhaust pipe is inserted into most of the outer shell 1, and the outer shell 1 and the tail pipe 2 form a double pipe structure. .
An expansion chamber 19 is formed by the double pipe structure. At the expansion chamber 19, the exhaust gas introduced from the inlet port 13 expands, is further sucked into the tail pipe 2 from the front opening 22 of the next tail pipe 2, and is discharged from the rear opening 21. Is done. The exhaust gas discharged from the engine is released into the atmosphere or water while being silenced by the series of expansion and discharge.

[0006] Further, when traversing the inside of a river or a puddle, water enters through the rear opening 21 of the tail pipe 2 in FIG.
Does not flow into the exhaust pipe 5 unless it goes beyond the front opening 22 of FIG. That is, in the range not exceeding the head difference (H), intrusion of water into the exhaust pipe 5 is prevented.

Furthermore, in the muffler 7 of the present invention, the tail pipe 2 forming the rear end of the exhaust pipe is inserted into the cylindrical outer shell 1, thereby forming a double pipe structure.
The trap portion and the expansion chamber (muffling mechanism) 19 are formed by the double tube structure. And the muffler 7 forming these traps and the silencing mechanism is
As shown in FIG. 2 and FIG. 3, it is compactly stored in the rear wheel house 9 or the like. As a result, the surrounding space in which the muffler 7 is stored is effectively used.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the present embodiment has a trap portion 10 and an expansion chamber 19 having a double pipe structure formed by a cylindrical outer shell 1 and a tail pipe 2 inserted into the outer shell 1. It is basically composed of a configuration.

In such a basic configuration, the cylindrical outer shell 1 is formed of a rolled can or the like formed by rolling a metal plate into a cylindrical shape, and is provided below the rolled can type outer shell 1. Is provided with an inlet port 13 for introducing exhaust gas from the engine, and a flange 131 used at the end of the inlet port 13 to be connected to the engine-side exhaust pipe 5 is provided. It has a configuration. The engine-side exhaust pipe 5 connected via the flange 131 is provided with a flange 51 in the same manner. The flanges 51 and 131 are joined and fastened with bolts and nuts. In addition, an exhaust pipe for an automobile is formed. Further, as shown in FIG. 2, the lowest portion 6 of the exhaust pipe for a vehicle formed as described above is formed on a part of the exhaust pipe 5 on the engine side.

[0010] Next, the tail pipe 2 inserted into the inside of the outer shell 1 of the above-mentioned can type is made of a circular pipe, and forms a rear end portion of an exhaust pipe for an automobile. Further, the upper end (front opening) of the portion of the tail pipe 2 inserted into the outer shell 1.
Reference numeral 22 denotes a position near the upper end surface of the outer shell 1 and lower than the upper end surface (lower position) as shown in FIG.
It is provided in. Then, a head difference (H) is formed between the front opening portion 22 and the exhaust pipe lowest portion 6, and the head difference (H) causes water to enter through the rear opening portion 21 of the tail pipe 2. Is prevented from flowing into the exhaust pipe lowest part 6.

An upper end surface 11 of a muffler 7 having a double pipe structure formed by the outer shell 1 and the tail pipe 2.
Is sealed with a cap 3 on a disk, and a lower end surface (a lower end surface 12 of the outer shell 1) is sealed with a ring-shaped cap (lower cap) 4 between the tail pipe 2 and the tail pipe 2. Has become. Thereby, the space formed by the double pipe forms the expansion chamber 19 of the muffler 7 and the rear end (rear opening) of the tail pipe 2.
Thus, the trap portion 10 for the water invading from 21 is formed.

The cylindrical muffler 7 having such a configuration
Are compactly stored in the rear wheel house 9 or in a dead space at the rear of the vehicle body.

The operation and the like of this embodiment having the above configuration will be described with reference to FIGS. That is, in FIG. 2, the exhaust gas discharged from the engine side is introduced into the cylindrical outer shell 1 from the inlet port 13 via the engine side exhaust pipe 5. Incidentally, a tail pipe 2 forming the rear end of the exhaust pipe is inserted into the outer shell 1 over most of the outer shell 1, and an expansion chamber 1 formed by the outer shell 1 and the tail pipe 2 is formed.
At 9, the exhaust gas introduced from the inlet port 13 expands, is sucked into the tail pipe 2 from the front opening 22 of the next tail pipe 2, and is further discharged from the rear opening 21. The exhaust gas discharged from the engine is released into the atmosphere or water while being silenced by the series of expansion and discharge.

When crossing a river having a certain depth of water, water tends to enter from the rear opening 21 of the tail pipe 2 as shown in FIG. 2. In this case, in this embodiment, The water does not flow into the engine-side exhaust pipe 5 unless it exceeds the front opening 22. That is, as long as the value does not exceed the value of the head difference (H), water is prevented from entering the engine-side exhaust pipe 5 and the lowest part of the exhaust pipe 6.

Further, in the muffler 7 of this embodiment, the tail pipe 2 forming the rear end of the exhaust pipe is inserted into the cylindrical outer shell 1, thereby forming a double pipe structure.
The trap section 10 and the expansion chamber 1 are formed by the double pipe structure.
9 is formed. Then, the muffler 7 forming the trap portion 10 and the expansion chamber 19 is the
As shown in FIG. 3, it is compactly stored in the rear wheel house 9 or in a dead space at the rear of the vehicle body. As a result, the surrounding space in which the muffler 7 is stored is effectively used.

[0016]

According to the present invention, the trap portion provided near the rear end of the exhaust pipe and having a predetermined head difference (H) with respect to the lowest portion of the exhaust pipe is provided. An automobile muffler having an outer shell having an inlet port connected to an exhaust pipe in a lower portion thereof, a tip end portion of the outer muffler being housed inside the outer shell. A tail pipe near the upper end surface of the outer shell and installed at a position lower than the upper end surface, and further, the upper end surface of the outer shell is sealed with a cap, and the lower end surface of the outer shell is Since the configuration between the tail pipe and the tail pipe is sealed by a ring-shaped cap, a double pipe structure is formed by the outer shell and the tail pipe, It has become possible to form expansion chamber as the muffler at the portion of the double pipe structure. In addition, it is possible to form a trap portion for preventing water from entering from the rear end of the exhaust pipe when crossing a river. In addition, the muffler that performs these functions is integrated in a cylindrical outer shell, which simplifies the overall shape of the muffler and is compactly housed in the rear wheel house or in the dead space at the rear of the vehicle. It was decided. Therefore, the space around the rear wheel house can be effectively utilized.

[Brief description of the drawings]

FIG. 1 is a developed perspective view showing the overall configuration of the present invention.

FIG. 2 is a perspective view showing the overall configuration of the present invention.

FIG. 3 is a diagram showing a state in which the muffler according to the present invention is housed in a rear wheel house.

FIG. 4 is a perspective view showing an overall configuration of the trap portion when a trap portion for providing a head difference is provided in a rear wheel house.

[Explanation of symbols]

 Reference Signs List 1 outer shell 11 upper end surface 12 lower end surface 13 inlet port 131 flange 19 expansion chamber 2 tail pipe 21 rear opening 22 front opening (upper end) 3 cap 4 ring-shaped cap (lower cap) 5 exhaust pipe (engine side exhaust pipe) ) 51 flange 6 lowest part of exhaust pipe 7 muffler 9 rear wheel house 10 trap part

Continuation of the front page (56) References JP-A-5-33628 (JP, A) JP-A 63-136219 (JP, U) JP-A 62-158120 (JP, U) JP-A 63-151920 (JP) , U) Japanese Utility Model Hei 2-87924 (JP, U) Japanese Utility Model Utility Model Hei 5-75433 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F01N 1/08 F01N 7/08 F01N 7/12

Claims (1)

(57) [Claims] 1. A large-diameter cylindrical member, comprising:
An outer shell having an inlet port connected to an exhaust pipe at a lower portion thereof, and the outer shell is housed inside the outer shell, and a tip portion thereof is installed near an upper end surface of the outer shell and lower than the upper end surface. And the upper end surface of the outer shell is sealed by a cap, and the lower end surface of the outer shell is sealed by a ring-shaped cap from the tail pipe. Characteristic automotive muffler.