JPH0234413Y2 - - Google Patents

Description

[Detailed description of the invention] A. [Purpose of the invention] (1) Field of industrial application] The present invention relates to an improvement of a muffler for an internal combustion engine, particularly a small two-stroke engine.

(2) Prior Art A disassembly type silencer as shown in Fig. 3 has been previously proposed in order to improve maintainability in the case of silencers for small two-stroke engines, in order to deal with troubles caused by clogging with tar, etc. This disassembly type silencer has a silencer main body 1 and a silencer lid 3 made of sheet metal or die-casting, which are detachably attached with screws 4 as shown in the figure, to form a silence chamber 10 inside. It fulfills the function of In addition, in the figure, 2 is a gasket interposed between the open end surface of the muffler main body 1 and the muffler lid 3, and 5 is a gasket interposed between the screw 4 and the muffler lid 3 as shown in the figure. 1a indicates a muffler inlet provided at a proper position on the front wall of the muffler main body 1, and 1b indicates a muffler outlet provided at a suitable position on the side wall of the muffler main body 1, respectively.

Although this conventional disassembled silencer has a simple structure and good maintainability, it does not sufficiently reduce the number of exhaust persons.

(3) Problems to be solved by the invention In the conventional muffler described above, exhaust gas flows from the engine cylinder through the muffler inlet 1a and into the muffler chamber 10.
When the gas enters the engine, it collides with the muffler lid 3, and the sound transmitted from the lid 3 and the sound generated from the lid 3 itself due to vibrations caused by the exhaust gas collision are the main causes of noise in two-stroke engines. Therefore, there are problems such as not being able to sufficiently reduce exhaust noise.

B [Structure of the invention] (1) Means for solving the problem The present invention was proposed to solve the above-mentioned drawbacks of the conventional technology. In a silencer in which a silencer lid is removably attached to the open end surface of a silencer body having a muffler outlet, a bowl-shaped partition is provided in the silencer body so that its bottom plate is located on the side of the silencer lid. The present invention relates to a structure of a silencer, which is attached to a silencer body together with the lid, and the bowl-shaped partition wall divides a silencing chamber in the silencer body into an inner silencing chamber and an outer silencing chamber. This is a solution to the problem.

(2) Function The silencer of the present invention is characterized by the above-mentioned configuration, and the exhaust gas entering from the silencer inlet 1a is blocked by the bowl-shaped partition wall 6 and is prevented from colliding directly with the silencer lid 3. Never. Therefore, there is no transmitted sound from the muffler lid 3, and the lid 3 itself does not vibrate and emit sound.

(3) Example Hereinafter, according to the example shown in Fig. 1 and Fig. 2,
The present invention will be explained in detail. In those figures,
1 is the muffler body, 1a is the muffler inlet, 1b is the muffler outlet, 2 is the gasket, 3 is the muffler lid, 4 is the screw, 5 is the gasket, and 10 is the muffler chamber. The related structure is almost the same as that of the conventional decomposable silencer mentioned above. (Equivalent parts are given the same reference numerals.) 6 is arranged so that the bottom plate 6a is located on the muffler lid 3 side and the opening 6b is located on the muffler inlet 1a side in the muffler main body 1. , a bowl-shaped partition placed inside the muffler main body 1, and the partition 6 has a bottom plate 6a.
It is fixed to the muffler body 1 together with the muffler lid 3 by a screw 4 at the center of the muffler body 1 . Silencer body 1
The inner silencing chamber 10 is divided by a bowl-shaped partition 6 into an inner silencing chamber 10a and an outer silencing chamber 10b.

As a means of attaching the bowl-shaped partition wall 6 to the silencer body 1, instead of fixing it together with the lid 3 with screws 4 as in the above example, the lid 3 and the bowl-shaped partition wall 6 may be fixed by welding or the like. .

One embodiment of the silencer of the present invention is constructed as described above, and when exhaust gas enters from the silencer inlet 1a side, the gas flows through the bowl-shaped partition wall 6 as shown by arrow a (FIG. 1). It expands once inside the inner muffling chamber 10a, and then passes through the gap between the muffler main body 1 and the bowl-shaped partition wall 6 on the muffler inlet 1a side, that is, the inside of the outer muffler chamber 10b, and then from the muffler outlet 1b as shown by arrow b. It is released into the atmosphere as shown by arrow c. Therefore, the exhaust gas entering from the muffler inlet 1a does not collide directly with the muffler lid 3, causing sound to be transmitted through the muffler lid 3, or causing the lid 3 itself to vibrate and emit sound. There is no such thing.

C [Effects of the invention] Since the silencer of the present invention has the above-described configuration and function, the present invention eliminates the drawbacks of the conventional example and achieves sufficient reduction of exhaust noise. This has the practical effect of making it possible to realize a muffler with improved performance.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a conventional example. FIG. 1: Silencer body, 1a: Silencer inlet, 1b: Silencer outlet, 2: Packing, 3: Silencer lid, 4: Screw, 5: Packing, 6: Bowl-shaped bulkhead, 10a: Inner sound damping chamber, 10b: Outside sound deadening room.

Claims (1)

[Scope of utility model registration request] A silencer in which a silencer lid is removably attached to the open end face of a silencer body which has a silencer inlet at an appropriate position on the front wall and a silencer outlet at an appropriate position on the side wall. A partition wall is attached to the silencer body together with the lid so that the bottom plate thereof is located on the side of the silencer lid, and the bowl-shaped partition wall forms a silencing chamber in the silencer body into an inner silencing chamber and an outer silencing chamber. A silencer that is characterized by