JPH0221536Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a silencer for an internal combustion engine.

In the past, it was common sense that a muffler was installed in an internal combustion engine via an exhaust manifold, but attempts were also made to attach a muffler directly to the engine. This is also seen in 67244 etc.

The above method is somewhat difficult in practice, as gas does not flow smoothly within the muffler, making it difficult to achieve its effectiveness.

This invention further improves the above points, and by smoothing the flow of gas, the sound deadening effect is improved, and by introducing gas into a wide space, the adiabatic expansion effect makes it highly effective in sound deadening and heat insulation. The purpose is to provide the following.

Next, embodiments of the present invention will be described based on the drawings.

Hole 1 corresponding to the exhaust port of the cylinder on the engine...
is formed in the container body 2 provided below the back wall of the container body 2, a silencing mechanism 3 is provided above the hole 1 in the container body 2, and an exhaust pipe 4 is provided at an appropriate position of the container body 2. As shown in FIGS. 1 and 2, the silencing mechanism 3 in the container body 2 is
...With two semi-circular arc-shaped perforated plates 5, 5 facing each other inside the upper container body 2, and as can be seen from the drawings, a plate of a size that closes about 80% of the volume of the container body 2 is placed. A space is formed, and a heat insulating material 6 such as glass wool is filled at the top of the container body 2 via a rectangular perforated plate 7, and approximately between the two perforated plates 5 and the rectangular perforated plate 7 is formed. A triangular cylindrical space is provided, and this part is defined as an interference part 8. Note that 9 in the drawings are mounting holes for bolts 10 for mounting the container body 2 to the engine. In addition, in order to attach the container body 2 to the engine,
The bolt hole for attaching a conventional manifold may be used for attachment, and in this case, the packing used for the manifold can also be used as is.

Note that it is of course possible to incorporate a conventional sound damping mechanism such as a small cylinder with a large number of holes as the structure of the sound deadening mechanism 3, and therefore,
For example, if the product of the present invention is manufactured for a 4-cylinder engine, when it is used in a 6-cylinder engine, there will be enough space for 2 cylinders. It is also possible to provide a drain pipe in the container body and connect each drain pipe to the lower side of the container body 2 of the product of the present invention.
Furthermore, if the horsepower of the engine is large and the displacement is large,
A space projecting upward and forward of the container body 2 may be provided, and the second noise reduction mechanism 11 may be provided in this space.

The present invention will be explained based on the embodiment shown in FIGS. 1 and 2 when the present invention is constructed as described above and is used.

When the container body 2 is attached to the engine and the engine is started, the exhaust gas flows from the exhaust port to the hole 1 of the container body 2, rather than through the manifold as in the conventional case.
...The exhaust gas enters directly into the container body 2, is introduced into a wide space, receives an adiabatic expansion effect, dissipates internal energy, and is extremely fast directly from inside the engine by the semicircular arc-shaped perforated plate. The flow of gas exhausted at high speed is guided smoothly and noise and high temperature are eliminated.It can withstand the high heat and noise of gas without using materials that can withstand high heat like conventional exhaust manifolds. It is extremely compact without the use of a manifold, has a good appearance, and requires less assembly time and parts.
It has extremely high practical effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is an enlarged sectional view along line ABCD in Fig. 1, and Fig. 3 is an enlarged sectional view of an embodiment of the present invention.
The figure is a sectional view showing the second embodiment, and FIG. 4 is a sectional view showing the third embodiment.
An enlarged cross-sectional view taken along the EFGH line in the figure. 1... Hole, 2... Container body, 4... Exhaust pipe, 5...
...Semicircular arc-shaped perforated plate, 6...Insulating material, 7...Rectangular perforated plate, 8...Interference part.

Claims (1)

[Scope of utility model registration request] A container body is provided with holes corresponding to the exhaust gas exhaust ports of each cylinder of an internal combustion engine, and the exhaust ports of the engine are aligned with the holes so that the container body can be directly attached. Inside the body, two half-circular perforated plates are placed opposite each other above the hole to occupy a large space, and the top of the container body is filled with a heat insulating material via the rectangular perforated plates. Said 2
A silencer characterized in that a triangular cylindrical interference part is provided between two semicircular arc-shaped perforated plates and a rectangular perforated plate.