JPH0219541Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to a muffler for a small engine.

Technical background of the invention and its problems Traditionally, engines have been fitted with mufflers to prevent the noise generated during explosion and combustion.
Exhaust gas generated within the combustion chamber of the engine is discharged into the atmosphere through the muffler. By the way, unburned components accumulate inside the combustion chamber of an engine, and when these deposits reach a certain thickness and are exposed to a flow of high-temperature gas, they peel off and become high-temperature particles.
It is discharged into the atmosphere along with exhaust gas from the exhaust port of the muffler. However, with engine-driven mowers, chainsaws, etc. used in the mountains and fields, if high-temperature particles are emitted into the atmosphere, there is a risk of starting a forest fire, so it is necessary to prevent the emission of high-temperature particles into the atmosphere. No.

Conventionally, as shown in FIGS. 1 and 2, a wire mesh 3 is attached to the tip of the exhaust discharge pipe 2 of the muffler body 1, and the wire mesh 3 traps high-temperature particles. 4 to prevent it from being released into the atmosphere. By the way, this wire mesh 3 is
Since it is attached by a cap 5 which is formed separately and welded to the muffler body 1, the number of parts increases and welding takes time and effort. Furthermore, it has drawbacks such as the inability to easily replace the wire mesh 3 or to clean the inside of the exhaust discharge pipe 2.

Purpose of the invention This invention was developed in view of the above points, and is a small engine that can reliably capture high-temperature particles emitted from the inside of the engine, and also allows easy attachment and removal and cleaning of the wire mesh that captures high-temperature particles. The purpose is to obtain a muffler.

Summary of the invention This invention attaches a wire mesh to the exhaust port side of the muffler body, and the wire mesh captures high-temperature particles emitted from inside the engine, preventing the high-temperature particles from being emitted into the atmosphere. The shape of the muffler is shaped like a hat with a brim around the periphery, and a plurality of cut-and-raised parts are formed on the periphery of the exhaust port of the muffler body toward the center of the exhaust port, and the wire mesh is attached to the wire mesh. By engaging the flange-like part with the cut-and-raised part and oriented so that it becomes convex toward the exhaust direction of the exhaust port, force is applied from the circumferential direction of the wire mesh to cause it to bend in the diameter-reducing direction. The structure is such that the wire mesh can be easily attached and detached, and the wire mesh can be easily cleaned.

Embodiment of the invention An embodiment of the invention will be described based on FIGS. 3 and 4. Connected to one side of the muffler body 6 is a connecting pipe 7 that is connected to an exhaust port (not shown) of an engine (not shown). Further, an exhaust discharge pipe 9 in which a plurality of small holes 8 are formed is built into the muffler body 6, and one end of the exhaust discharge pipe 9 is joined to the inner surface of the muffler body 6 to be closed. The other end opens on the outer surface of the muffler body 6 and exhaust port 1
It is considered to be 0. Exhaust port 10 of the muffler main body 6
A plurality of cut and raised portions 11 are formed on the periphery to open toward the center of the exhaust port 10.

Next, a hat-shaped wire mesh 13 having a flange-like portion 12 formed on its periphery is provided. Then, this wire mesh 13 has the brim portion 12 cut out from the raised portion 11.
to cover the exhaust port 10 and the exhaust port 1
It is removably attached in a direction that is convex toward the exhaust direction from zero.

In such a configuration, exhaust gas discharged from the engine into the muffler body 6 through the connecting pipe 7 enters the exhaust discharge pipe 9 through the small hole 8, and enters the exhaust port 1.
0, is discharged into the atmosphere through the wire mesh 13. The exhaust gas discharged from the engine into the muffler body 6 may contain high-temperature particles, and these high-temperature particles are transferred to the wire mesh 13 when the exhaust gas passes through the wire mesh 13.
captured by. Therefore, only the exhaust gas is discharged into the atmosphere, and it is possible to prevent forest fires and the like from occurring due to the scattering of high-temperature particles. Moreover, the wire mesh 13 is attached in a convex direction in the exhaust gas discharge direction, so that the filtration area becomes large and the exhaust resistance becomes small, thereby preventing a decrease in engine output. Further, since the surface area of the wire mesh 13 is large, it takes a long time until clogging occurs, and the effort of frequently cleaning the wire mesh 13 can be saved. moreover,
The wire mesh 13 is attached by engaging the collar portion 12 with the cut and raised portion 11.
The collar portion 12 can be removed from the cut and raised portion 11 by pinching the convex portion 14 of the wire mesh 13 with fingers and applying force in the direction of diameter reduction. Therefore, the wire mesh 13 can be easily attached and removed without using any tools, and the inside of the wire mesh 13 and the exhaust discharge pipe 9 can be cleaned easily.

Effects of the invention Since this invention is configured as described above, the wire mesh reliably captures high-temperature particles contained in exhaust gas from the engine, thereby preventing dangers such as forest fires due to high-temperature particles being emitted into the atmosphere. The wire mesh can be easily attached and removed without the use of tools, making it easy to clean the wire mesh and the inside of the exhaust port.The wire mesh's filtration area can be increased to reduce engine damage caused by exhaust gas exhaust resistance. This has effects such as being able to prevent a decrease in output.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a sectional view showing an enlarged part of it, Fig. 3 is a vertical sectional side view showing an embodiment of this invention, and Fig. 4 is a state in which the wire mesh is installed. It is a front view which expands and shows. 6...Muffler body, 10...Exhaust port, 11...
Cut and raised portion, 12...Brim portion, 13...Wire mesh.

Claims (1)

[Scope of utility model registration request] A plurality of cut-and-raised parts are formed on the periphery of the exhaust port of the muffler body toward the center of the exhaust port, and a hat-shaped wire mesh with a flange-shaped portion formed on the periphery is provided. A muffler for a small engine, characterized in that the muffler is detachably mounted in such a direction that a portion engages with the cut-and-raised portion and becomes convex toward the exhaust direction of the exhaust port.