JP2976674B2 - Small engine muffler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a small engine used in a motorcycle or the like.

[0002]

2. Description of the Related Art In a motorcycle, a cylindrical muffler is connected to an exhaust pipe of an engine, and the muffler is attached to a rear side surface of a vehicle body.
The muffler is used to mute the sound. In the muffler, an expansion chamber is provided at the front, a muffler is formed at the rear with a plurality of mufflers separated by a partition plate, and the mufflers are connected to each other by a baffle pipe. The baffle pipe at the front end protrudes into the expansion chamber. The tip of the baffle pipe protruding into the expansion chamber is welded to the inner wall of the expansion chamber using a stay to prevent the baffle from oscillating.

[0003]

If the front end of the baffle pipe is welded to the inner wall of the expansion chamber with a stay,
Since the front expansion chamber and the rear silencing chamber cannot be separately formed with high working efficiency, the work is complicated and the cost is increased.

[0004] In view of the above, the present invention makes it possible to separately manufacture the front expansion chamber and the rear muffling chamber and insert and weld the muffling chamber to the expansion chamber in the final step, thereby improving productivity. To obtain a muffler for a small engine that can reduce costs.

[0005]

In order to achieve the above object, a muffler for a small engine according to the present invention has a front expansion chamber formed by left and right mating plates and a rear silencing chamber formed by a cylindrical plate. That is, the front end of the baffle pipe protruding forward from the sound deadening chamber is welded to the front protrusion of the cylindrical plate using a stay, and the front end of the sound deadening chamber is inserted and welded to the rear end of the expansion chamber.

[0006]

[Function] The baffle pipe at the front end, which protrudes forward from the sound deadening chamber, is welded to the front projecting part of the cylindrical plate with a stay, so the relationship with the expansion chamber can be cut off. can do. Then, in the final step, the front end of the sound deadening chamber is inserted into the rear end of the expansion chamber to be welded together. Thereby, productivity can be improved and cost can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In front of the muffler is a large volume expansion chamber 1
Is provided. The expansion chamber 1 is configured such that the left and right mating plates 2 are fitted in the middle and welded to each other, and an inner plate 4 having a number of small holes 3 provided therein. A sound absorbing material 5 such as glass wool is packed between them. The inlet pipe 6 is inserted deep into the expansion chamber 1 and fixed. At the rear part, three muffling chambers 9 are provided by partitioning the inside of the inner cylinder plate 7 back and forth with a partition plate 8, and the three muffling chambers 9 are communicated by baffle pipes 10.

The baffle pipe 10 at the front end is protruded forward and inserted into the expansion chamber 1. The cylindrical plate 7 is partially provided with a forward protruding portion 11 on the lower side, and the tip end of the baffle pipe 10 at the front end is welded and connected via a stay 12 to prevent the baffle from oscillating. The sound deadening chamber 9 is integrally formed by inserting the front end into the rear end of the expansion chamber 1 and welding all around.

The expansion chamber 1 formed by the left and right mating plates 2 and the sound deadening chamber 9 formed by the cylindrical plate 7 and the partition plate 8 can be separately formed. Then, in the final step, the expansion chamber 1 and the sound deadening chamber 9 can be assembled and integrally formed.

[0010]

As described above, since the present invention is constructed as described above, the front end of the baffle pipe 10 at the front end is welded to the front protruding portion 11 of the cylindrical plate 7 via the stay 12. Front expansion chamber 1 and rear silencer 9
Can be separated and produced separately, productivity can be increased, and costs can be reduced. The expansion chamber 1 and the muffling chamber 9 can be welded together in the final step.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1 showing the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion chamber 2 Lamination board 7 Cylindrical board 9 Silence room 10 Baffle pipe 11 Front projection 12 Stay

Claims (1)

(57) [Claims] 1. The front expansion chamber is formed by left and right plywood,
The rear silencer is formed by a cylindrical plate, and the end of the baffle pipe protruding forward from the silencer is welded to the forward protrusion of the cylindrical plate using a stay, and the front end of the silencer is attached to the rear end of the expansion chamber. A muffler for a small engine, which is inserted and welded.