JPH08284654A - Exhaust silencer for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a conventional baffle plate by making exhaust gas longitudinally pass through an annular chamber formed between a first and a second tubes, providing a third tube concentric with the first and second tubes, and making cooling air pass through the annular chamber formed between the second and third tubes. SOLUTION: This exhaust muffler 1 is provided with an internal first tube 2 where cooling air passes, and a second tube 3 disposed concentrically with the tube 2, and engine exhaust gas flows through an annular chamber partitioned between both tubes 2, 3. An external third tube 3 is disposed concentrically with the second tube 3, and cooling air flows through an annular chamber partitioned between both tubes 3, 4. A spiral horizontal member 5 is interposed in the annular chamber between the tubes 2, 3 where exhaust gas flows, and a reinforcing linear lateral member 6 is disposed in the annular chamber between the tubes 3, 4. The outlet tip 4A of the third tube 4 is formed in tapered shape compared to the body of the tube 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust muffler for an automobile, which has better performance than a conventional muffler using a "baffle".

[0002]

2. Description of the Related Art A conventional baffle is a silencer for automobiles.
(Chicane) was used, and there was a problem in terms of performance.

[0003]

The conventional sound deadening device uses a "baffle", which is structurally complicated and has a problem in terms of sound deadening effect. The present invention has been made under such circumstances, and an object of the present invention is to provide a "baffle plate".
It is an object of the present invention to provide a muffler for automobiles that eliminates the above and has good performance.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to an exhaust muffler for an automobile. The above object of the present invention is to provide an internal first pipe through which cooling air vertically passes, and the first pipe. And a second central pipe that is concentric with the first and second pipes, and an annular chamber formed between the first and second pipes is installed for the exhaust gas of an automobile engine to pass vertically. And a third outer tube concentric with the second tube, the second tube
And an annular chamber formed by a third tube for the cooling air to pass longitudinally.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The automobile exhaust muffler of the present invention should be noted in the following points. That is, the present invention has an internal first tube for longitudinal passage of cooling air,
A second central tube having the same circle as the first tube, an annular chamber provided between the first and second tubes has a longitudinal passage for the exhaust gas of the vehicle engine, and 1 tube and 2
A third external tube having a concentric circle with the second tube is provided, and an annular chamber provided between the second tube and the third tube allows cooling air to pass vertically.

Thus, a silencer structure that does not use "baffles" will cool the exhaust gas of an automobile engine and reduce its volume, and thus its pressure. . Further, when the automobile is running, the intake effect of the exhaust gas is exhibited by the cooling air based on the arrangement of the muffler of the present invention. Then, when stopped, the exhaust gas draws in cooling air. Overall, such a concept makes it possible to save on fuel consumption. Also, a spiral cross member is provided between the first and second pipes to guide the exhaust gas. A straight cross member is preferably installed vertically between the second and third tubes to enhance exhaust guidance. Another feature of the invention is that at the outlet of the muffler the inner tube stops in front of the central tube and the central tube stops in front of the outer tube. Another feature of the invention is that the tip of the outlet of the outer tube is narrower than the body of the tube.

In accordance with the invention, FIG. 1 illustrates a motor vehicle V in which an engine M is connected via a medium C to an exhaust silencer 1 via an exhaust pipe E. Then, as seen in FIG. 2, in the exhaust silencer 1, cooling air (cooling air can be taken in at the front of the vehicle. The pipe for this is not shown in this figure) is arranged vertically. It contains an internal first tube 2 through which it passes. The second pipe 3 in the center is concentric with the second pipe, and the annular chamber provided between the first pipe 2 and the second pipe 3 is exhaust pipe E from the exhaust of the engine M of the automobile. The gas passes vertically. The outer third pipe 4 is concentric with the first and second pipes 3, and the annular chamber provided between the second and third pipes 3 and 4 allows cooling air to pass vertically. It is like this.

Further, a spiral cross member 5 is installed between the first pipe 2 and the second pipe 3 so that the exhaust gas (arrow) is guided according to the spiral process. On top of that, a straight cross member 6 for reinforcement is further installed. In addition to this, at the outlet of the silencer 1, the inner first pipe 2 stops in front of the central second pipe 3, and the central second pipe 3 also extends to the outer third pipe 4.
You can see it stopped in front of. External third tube 4
Has an outlet tip 4A thinner than the tube body 4. That is, the diameter of the outlet is smaller than the diameter of the body of the tube.

[0009]

As already pointed out, the exhaust gas is cooled by the arrangement described above, and the exhaust gas is sucked by the cooling air, so that the above-described effects are exhibited. A ventilator (not shown here) can also be attached to the cooling air delivery tube. Moreover, at the outlet of the catalyst, the exhaust pipe can be branched and connected to the silencer without the "baffle plate" having the above-described structure.

[Brief description of drawings]

1 is a schematic view of an automobile equipped with an exhaust silencer according to the present invention.

FIG. 2 is a schematic sectional view of an exhaust silencer according to the present invention.

[Explanation of symbols]

 1 Exhaust silencer 2,3,4 Pipe 5,6 Horizontal member

Claims (5)

[Claims] 1. An internal first pipe 2 for longitudinal passage of cooling air, and a central second pipe concentric with the first pipe, wherein the first and second pipes are provided. An annular chamber formed between the pipes is installed for longitudinal passage of exhaust gas from an automobile engine, and has a third outer pipe concentric with the first and second pipes, The exhaust silencer for an automobile, wherein the ring-shaped chamber formed by the second and third pipes is installed to vertically pass cooling air. 2. The exhaust silencer for an automobile according to claim 1, wherein a spiral cross member for guiding exhaust gas is installed between the first pipe and the second pipe. 3. A linear cross member for reinforcement is provided on the second side.
1 or 2 installed vertically between the third pipe and the third pipe.
The exhaust silencer for a vehicle according to item 1. 4. The pipe according to claim 1, wherein the first pipe stops at the outlet of the silencer before the second pipe, and the stop pipe stops before the third pipe. Exhaust silencer for automobiles. 5. The exhaust silencer for an automobile according to claim 4, wherein the tip of the outlet of the first pipe is thinner than the main body of the pipe.