JP2515261Y2 - Exhaust silencer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an exhaust silencer for a small two-cycle engine, which is mainly installed in an engine, particularly a backpack power spreader, a brush cutter, and the like, and is specifically caused by a bee entering inside. The present invention relates to an exhaust silencer that can eliminate the obstacles.

[0002]

2. Description of the Related Art A backpack power sprayer for spraying powdery or granular chemicals on a field and a brush cutter for mowing grass in a green belt of a park or a street are equipped with a small two-cycle engine as a power source. In this case, in order to reduce the exhaust noise, it is common to release the exhaust gas to the atmosphere through the exhaust silencer.

[0003]

By the way, the exhaust outlet of the conventional exhaust silencer of this kind is formed as a simple hollow having a hollow cylindrical shape, and its inner diameter is set to a size suitable for a bee to enter. At the same time, the unburned lubricating oil contained in the exhaust gas accumulates inside the exhaust silencer as a tar, and the bees prefer this tar. It may get inside and form a nest, which obstructs the flow of exhaust gas and eventually causes malfunction of the small two-cycle engine.

[0004]

According to the present invention, in an exhaust muffler for an engine, an engagement groove (7) is formed in an inner wall near an opening of an exhaust outlet (6) of the exhaust muffler (2). Then, an elastic locking body (8) detachably attached to the engaging groove (7) is provided with an engaging portion (9) locked in the engaging groove (7) and the engaging portion (9). And a needle-like protrusion (10) that is integrally formed with the exhaust outlet (6) and projects toward the center of the cross section of the exhaust outlet (6). is there.

[0005]

In the exhaust silencer having the above structure, when a bee tries to enter the silencer body from the exhaust outlet, the inner diameter of the exhaust outlet is such that the bee can pass through the exhaust silencer. You cannot get inside because you are blocked. Moreover, since the needle-shaped protrusions occupy only a small area with respect to the cross-sectional area of the exhaust outlet, there is no possibility of adversely affecting the flow of exhaust gas.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the invention will be described with reference to the illustrated embodiments. FIG. 6 shows an exhaust silencer 2 for a small Nicycle engine 1.
FIG. 1 is a conceptual diagram showing a combined state of the small two-cycle engine 1 including a backpack-powered sprayer for spraying powdery granular chemicals or the like on a field, and a brush cutter for mowing grass in a park, green space or street. Is equipped as a power source on a small working machine such as
An exhaust port 4 is formed, and the exhaust silencer 2 is connected to the exhaust port 4.

Exhaust gas that has undergone a predetermined silencing function within the silencer body 5 of the exhaust silencer 2 is discharged from the exhaust outlet 6 to the atmosphere.

FIG. 7 is a side view of the exhaust silencer 2.
FIG. 1 is an enlarged sectional view of the exhaust outlet 6, and FIG. 2 is an enlarged front view of the exhaust outlet 6 seen from the opening side. The exhaust outlet 6 projects from the main body 5 at the lower part of the silencer main body 5 and has a hollow cylindrical shape, and the inner diameter thereof has a dimension that allows a bee to pass through.

An engaging groove 7 is formed around the inner wall of the exhaust outlet 6 in the vicinity of the opening, and an elastic body 8 is locked in the engaging groove 7. , The engaging groove 7
And an acicular projection 10 that is integrally formed with the engagement section 9 and projects toward the center of the cross section of the exhaust outlet 6.

In practice, the engaging portion 9 of the elastic locking body 8 is
The example shown in FIGS. 1 and 2 is formed as a notched annular snap ring as shown in FIG.
It may have a triangular shape as described above, or may have another shape. The point is that it has only to have a function of being removably and elastically locked to the engaging portion 9.

The end of the needle-like protrusion 10 should have a flat cut 11 as shown in FIG. 3 and a sharp cut 12 as shown in FIG. It is effective in that it makes the bee feel more injured. In any case, the presence of the needle-shaped protrusions 10 has a function of preventing the invasion of bees, and this has only a small occupied area as viewed from the cross-sectional area of the exhaust outlet 6, so that the exhaust gas is exhausted. There is no risk of adversely affecting the gas flow.

[0012]

According to the above structure of the present invention, from the exhaust outlet of the exhaust silencer of the small two-cycle engine used for work in the field, green areas, streets, etc., such as a backpack power spreader and a brush cutter. It is extremely useful in that it can prevent the invasion of bees and nest formation inside, and can prevent obstacles caused by blocking the exhaust outlet, and the elastic locking body is detachable. Therefore, it can be removed for cleaning and inspection of the exhaust silencer, and the needle-like protrusions of the elastic locking body have a small occupied area compared to the cross-sectional area of the exhaust outlet. It does not hinder the flow of exhaust gas and does not adversely affect engine performance.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a front view of the portion shown in FIG.

FIG. 3 is a front view of an example of components of the present invention.

FIG. 4 is a front view of another example of the components of the present invention.

FIG. 5 is a front view of still another example of the components of the present invention.

FIG. 6 is a conceptual diagram showing a connection state of an exhaust silencer with a small two-seat engine.

FIG. 7 is a side view of the exhaust silencer shown in FIG.

[Explanation of symbols]

 2 Exhaust silencer 6 Exhaust outlet 7 Engagement groove 8 Elastic locking body 9 Engagement portion 10 Needle-like protrusion

Claims (1)

(57) [Scope of utility model registration request] 1. An exhaust silencer for an engine, wherein an engaging groove (7) is formed on an inner wall of the exhaust silencer (2) near an opening of an exhaust outlet (6), and the engaging groove (7) is formed in the engaging groove (7). On the other hand, an elastic locking body (8) which can be attached and detached to and from the engaging portion (9) locked in the engaging groove (7) is integrally formed with the engaging portion (9), and An exhaust silencer characterized by comprising a needle-like protrusion (10) that once protrudes toward the center of the cross section of the exhaust outlet (6).