JPH0216011Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a muffler for internal combustion engines of automobiles and the like.

[Conventional technology]

Conventionally, this type of silencer generally divides the inside of the cylinder into multiple chambers using partition plates, communicates each compartment with a connecting pipe, and sends the exhaust gas led into the cylinder through the exhaust pipe to each compartment sequentially. The structure is such that the exhaust gas is allowed to flow in and expanded and contracted, thereby reducing exhaust noise and temperature, and then discharging it from the exhaust tail pipe to the outside of the cylinder.

Water is passed through the lower part of each partition plate in order to discharge the water vapor contained in the exhaust gas that condenses as the temperature decreases and accumulates at the bottom of the vessel outside the vessel. It is known that by providing a hole and opening the exhaust gas inlet end of the exhaust tail pipe at the bottom of the tube, water accumulated in the tube can be discharged out of the tube along with the exhaust gas.

However, in cold regions, there was a risk that the water that had accumulated inside the cylinder would freeze and block the exhaust tail pipe that opened at the bottom of the cylinder, making it impossible to start the engine.

Therefore, conventionally, for example, in Japanese Utility Model Publication No. 56-46023 (Japanese Utility Model Publication No. 55-137211), in the middle of an exhaust tail pipe whose exhaust introduction side end opened at the bottom of the cylinder, By providing a small communicating hole with the compartment through which the exhaust tail pipe passes, and by providing an exhaust hole in the partition plate between the compartment and the compartment through which the inlet end of the exhaust tail pipe opens. ,
It has been proposed that when the inlet end of the exhaust tail pipe is blocked by frozen water as described above, the exhaust gas inside the vessel is discharged from the exhaust tail pipe to the outside of the vessel via the above-mentioned exhaust hole and small communication hole. ing.

[The problem that the idea attempts to solve]

However, in the conventional type mentioned above, if the exhaust hole or small communication hole is small, the exhaust gas cannot be discharged smoothly when starting the engine when it freezes, which may cause trouble in starting. During normal operation, a portion of the exhaust gas is discharged from the exhaust hole or the small communication hole to the outside of the device before it is sufficiently muffled, resulting in a deterioration in the muffling performance. Particularly when the compartment through which the exhaust tail pipe passes is a resonance chamber, it tends to have an adverse effect on its unique delicate silencing performance. Furthermore, if a hole is provided in the middle of the exhaust tail pipe as in the conventional example above, it will sensitively affect the timbre and noise level of the exhaust sound emitted from the tail pipe, making it difficult to adjust noise reduction measures and reducing drainage performance. There are other problems.

The present invention aims to solve the above problems with a simple configuration.

[Means to solve the problem]

In order to achieve the above object, the silencer of the present invention has the following configuration.

That is, the inside of the muffler cylinder 1 is divided into a plurality of chambers 5 to 8 by partition plates 2 to 4, and a water passage hole 13 is provided at the lower part of each partition plate 2 to 4, and a water passage hole 13 is provided at the bottom of each partition plate 2 to 4. In a silencer for an internal combustion engine, the end of which is opened at the bottom of the cylinder 1 so that the water accumulated in the cylinder 1 is discharged outside the cylinder together with the exhaust air, an exhaust tail pipe is provided separately from the exhaust tail pipe 12. A pipe 11 is provided, and the end of the exhaust tail pipe 11 on the exhaust gas introduction side is opened at a position above the bottom of the chamber 1.

[Effect]

In the above configuration, when it is cold, the silencer cylinder 1
If the water that has accumulated at the bottom of the cylinder freezes and blocks the exhaust tail pipe 12 that opens at the bottom, the exhaust tail pipe 12 that opens at a higher level than the exhaust tail pipe 12 opens into the cylinder. The exhaust gas inside the cylinder is smoothly discharged out of the cylinder through another exhaust tail pipe 11, and the engine can be started without any problems.Furthermore, after starting, the heat of the exhaust gas melts frozen ice. The exhaust tail pipe 12, which had been blocked due to this, will soon open, and the melted water will be discharged from the tail pipe 12 to the outside of the vessel along with the exhaust gas.

〔Example〕

1 and 2, the inside of the chamber 1 is divided into three expansion chambers 5 to 7 and a resonance chamber 8 by partition plates 2 to 4, and each of the expansion chambers 5 to 7 is communicated with each other by connecting pipes 9 and 10. Exhaust gas entering the vessel cylinder from the exhaust gas introduction pipe 14 is sequentially transferred to the expansion chamber 5,
6 to the final expansion chamber 7. 15 indicates a throat tube communicated with the resonance chamber 8.

In the case of the figure, two exhaust tail pipes are provided to discharge the exhaust gas that has entered the final expansion chamber 7 to the outside of the device.
One of the exhaust tail pipes 12 has a central part 12b formed into a gently sloping pipe, and an exhaust introduction side end 12a that is substantially horizontal and opens near the bottom of the final expansion chamber 7. The exhaust gas introduction side end is opened at a higher position above the bottom of the chamber 1.

A water passage hole 13 is provided at the bottom of each of the partition plates 2 to 4, and the water accumulated in the chamber 1 is drained into the expansion chamber 7, which is opened at the exhaust introduction side end of the exhaust tail pipe 12. After being guided, the gas is discharged to the outside of the vessel through the exhaust tail pipe 12 together with the exhaust gas. When the water accumulated at the bottom of the cylinder 1 freezes and the exhaust tail pipe 12 is blocked, the exhaust gas can be smoothly discharged from the other exhaust tail pipe 11 and the engine can be started without any problems. be.

3 and 4 show that the inside of the chamber 1 is divided into two expansion chambers 5, 7 and a resonance chamber 8 by partition plates 2, 4, and the exhaust gas introduction side end of one of the two exhaust tail pipes 11, 12 is shown in FIG. Part 12
An example where a is bent substantially vertically downward in the final expansion chamber 7, and its lower end is opened at the bottom of the chamber 7, and the exhaust introduction side end of the other exhaust tail pipe 11 is opened at a position higher than that. shows.

Figures 5 and 6 show a modification in which the two exhaust tail pipes 11 and 12 having the above-mentioned relationship are merged within the chamber 1 so that there is only one exhaust tail pipe on the exhaust side.

Note that when the exhaust tail pipe 12 is provided with a bent portion as described above, airflow noise is likely to occur. In order to cope with this problem, it is preferable to form a small hole 16 in the exhaust tail pipe behind the bent portion and provide a sound absorbing material 17 around the small hole 16, as shown in FIG. The same applies to the examples shown in FIG. 3 and FIG. 5.

[Effect of idea]

Since the present invention has the above-mentioned configuration, as described in the operation section, the water accumulated at the bottom of the muffler cylinder 1 freezes, and the exhaust tail pipe 12 with one end opened at the bottom is formed. Even if it is blocked, the exhaust gas can be smoothly discharged through the other exhaust tail pipe 11 without any resistance, so the engine can be started without any problem. tube 12
The water accumulated in the container 1 can be discharged through the container 1. Therefore, as in the conventional case, the exhaust holes and communication holes used to form the exhaust passage when freezing are too small, which may impede engine starting, or too large, which impairs the noise reduction performance under normal conditions. The problem can be solved very easily.

Furthermore, by forming a small communicating hole in the middle of the exhaust tail pipe as in the conventional method, it does not adversely affect the timbre or noise level of the exhaust sound emitted from the tail pipe, so it is possible to adjust the silencing performance. It is easy to use and has the advantage of not impairing the drainage function.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the silencer of the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a longitudinal sectional front view of another embodiment.
FIG. 4 is a side view thereof, FIG. 5 is a longitudinal sectional view of a modified example, and FIG. 6 is a side view thereof. 1 is a muffler cylinder, 2 to 4 are partition plates, 5 to 8 are compartments, 9 and 10 are coupling pipes, 11 and 12 are exhaust tail pipes,
13 is a water hole.

Claims (1)

[Scope of claim for utility model registration] The interior of the silencer cylinder is divided into multiple chambers by partition plates,
A water hole is provided at the bottom of each partition plate, and the exhaust introduction side end of the exhaust tail pipe is opened at the bottom of the tube to drain water accumulated in the tube through the exhaust tail pipe. In a muffler for an internal combustion engine that discharges air outside the cylinder, an exhaust tail pipe is provided separately from the exhaust tail pipe, and the end of the exhaust tail pipe on the exhaust introduction side is opened at a position above the bottom part. A silencer for an internal combustion engine characterized by: