JPH0619791Y2 - Muffler structure of portable engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a muffler structure of a portable engine which can be carried with a working machine and has good functionality and a compact structure.

[Prior Art] Conventionally, a structure in which flames in exhaust gas discharged from an engine can be captured by a wire net and the temperature and concentration of exhaust gas can be reduced by an ejector and a diffuser is practically used. It is found in Japanese Kosho 55-2168.

[Problems to be Solved by the Invention] However, such a structure cannot be applied to an exhaust device of an engine provided in a portable working machine such as a brush cutter because of a large tail pipe and a large size. Had a glitch.

[Means for Solving the Problem] The present invention solves such a problem and makes the muffler into a compact structure with good functionality. Therefore, a stainless steel mesh plate is provided at the tip end of the tail pipe of the muffler. A tail pipe extension member having a U-shaped cross section, which extends along the outer surface of the muffler and covers the tip end port, is fixed to the outer peripheral wall of the muffler by fasteners such as bolts, and the tail pipe is The extension member is formed by forming a plurality of louvers on the side surface in the middle thereof.

[Operation] Therefore, the sparks in the exhaust gas are erased by the stainless steel mesh plate arranged at the outlet of the tail pipe, and the temperature of the exhaust gas is also increased by the air from the louvers provided on the intermediate side surface of the tail pipe extension member. It can be lowered by the inflow.

Example Next, an example shown in the drawings will be described.

An engine (E) integrally connected to the rear end of a portable brush cutter
A muffler with a muffler cover (10) attached to the exhaust port (9) side of the
The muffler (1) is connected to the muffler (1), and the communication port (3) formed on one end face of the muffler (1) is matched with the exhaust port (9), and three columns are erected in the muffler (1). Bolt (1) to (11)
2) is attached and the muffler (1) is connected to the side of the engine (E).

The inside of the muffler (1) is divided by the partition plate (2) into the engine (E)
The first chamber (A) on the side of the communication port (3) that communicates with the second chamber (B) that communicates with the tip end port (4a ') of the tail pipe (4a), and the communication port ( A spherical concave portion (5) bulging inward of the second chamber (B) is formed in the part of the partition plate (2) facing the 3), and the other part of the partition plate (2) is formed. , A portion facing the lateral side of the tip opening (4a ′) while letting exhaust gas flow into the second chamber (B) and diverting around the spherical concave portion (5), Three communication guide ports (6) that can be discharged to 4a ') are formed by punching.

Further, the tail pipe (4a) has a muffler (1) at its outer end side.
One end side of the tail pipe extension member (4b) formed in a trough shape having a U-shaped cross section so as to cover the outer side of the tail pipe (4a). The tail pipe extension member (4b) is aligned with the outer peripheral wall portion (1a) of the muffler (1) so that the bent end opening (4b ') on the other end side is opened outward, and four bolts are attached. Fixed by (13),
A stainless steel mesh plate (7) and a pressing plate (14) are sandwiched between the outer end side of the tail pipe (4a) and one end side of the tail pipe extension member (4b) to form the tail pipe extension member. A plurality of louvers (8) are formed on the outer surface in the middle of (4b) at intervals in the longitudinal direction.

Therefore, the exhaust gas flowing into the first chamber (A) through the communication port (3) collides with the inner surface side of the spherical recess (5) as shown by the arrow (a) and expands while the first chamber ( The exhaust gas that flows into the second chamber (B) from each communication guide port (6) as shown by the arrow (B) can be effectively distributed by being widely dispersed in A). , As indicated by arrows (c), (d), and (e), it flows so as to bypass the outer periphery of the spherical recess (5), and the tail pipe extends through the tail pipe (4a) from the tip opening (4a '). Although it will flow into the member (4b), the flame of the exhaust gas at that time is the stainless steel mesh plate (7).
Will be captured by the exhaust gas,
From (4a ′) to the tail pipe extension member (4b), arrow (f)
In the state that it flows out as shown in Fig., The temperature and concentration of the exhaust gas can be lowered while supplying air from each louver (8) as shown by the arrow (g), and the concentration is low without dew condensation. The exhaust gas that has become
It will be discharged from b ') as shown by the arrow (h).

[Effect of the Invention] As described above, according to the present invention, the sparks in the exhaust gas can be satisfactorily eliminated by the stainless net plate (7) of the tail pipe tip opening (4a ′), and the tail pipe extension member (4b) It is possible to lower the temperature of the exhaust gas while inhaling from the louver (8), improving the functionality in this way and making it compact with no protruding parts compared to the conventional exhaust device, suitable for portable work. It has the feature that it can be suitably implemented as an engine muffler.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line I--I of FIG. 2, which is a sectional view of the essential part of an embodiment of the present invention, and FIG. 2 is a sectional view of FIG.
A view taken along line II-II, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is a cross-sectional view of the inside of the muffler. (1) ... muffler, (1a) ... outer peripheral wall (4a) ... tail pipe, (4a ') ... tip opening (4b) ... tail pipe extension member (8) ... louver

Claims (1)

[Scope of utility model registration request] 1. A tip end port (4) of a tail pipe (4a) of a muffler (1).
A mesh plate made of stainless steel (7) is stretched over a ') and the tip opening (4
a tail pipe extension member (4b) having a U-shaped cross section that extends along the outer surface of the muffler (1) and is secured to the outer wall (1a) of the muffler (1) by a fastener such as a bolt. A muffler structure for a portable engine, which is characterized in that a plurality of louvers (8) are formed on an intermediate side surface of the tail pipe extension member (4b).