JPH0223777Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to muffler improvement for internal combustion engines.

Generally, a long cylindrical muffler is used for an internal combustion engine used in a motorcycle or the like. Normally,
Insert multiple partition plates into the muffler outer cylinder and weld them together.
A plurality of silencing chambers are arranged in tandem inside the muffler outer cylinder. Then, a thin communication pipe is passed through and welded to the partition plate to communicate between the silencing chambers. Depending on the silencing frequency of exhaust gas, one silencing chamber may be connected to the next silencing chamber by skipping over the next silencing chamber, and is a communication pipe that is passed through and welded to the partition plate. There are a large number of parts, welding work is difficult, and manufacturing costs are high. Also, since it cannot be disassembled, it cannot be cleaned with items such as two-stroke engines that collect tar.

In view of this point, this invention divides the interior of the buttful pipe penetrated by the partition plate so as to form a plurality of passages in the axial direction, and the communication between each sound deadening chamber is as follows.
The present invention is improved by concentrating the passages in the buffle pipe, and the present invention will be described below with reference to an embodiment shown in the drawings.

Insert the partition plate 2 into the muffler outer cylinder 1 and weld it,
A first silencing chamber 3, a second silencing chamber 4, and a third silencing chamber 5 are provided in tandem. The front side of the first silencing chamber 3 is an expansion chamber 6. A hole is provided in the center of the partition plate 2, and the buttful pipe 7 is inserted through it from the rear end. The baffle pipe 7 has a separating plate 8 inserted thereinto to provide a plurality of passages in the axial direction. The separation plate 8 is welded or press-fitted into the buttful pipe 7. The separation plate 8 is formed of a formed steel plate bent as appropriate as shown in FIG. 2 or FIG. 6, and the passages shown in FIGS. , 12, and 13 are provided, and in the one shown in FIG. 6, four channels are provided, 9, 10, 11, and 12. Each passage has holes 14a, 14b, 14
c, 14d, 14e, 14f, and 14g as appropriate to the silencing chambers 3, 4, and 5, and a closing plate 15 is provided to prevent exhaust gas from flowing into the excess portion.

That is, in the muffling chamber 3, holes 14a and 14b are provided in the buff-full pipe 7 to communicate the muffling chamber 3 with the passages 11 and 12, and a hole 14c is provided in the separation plate 8 to communicate with the passages 12 and 13. In addition, in the silencing room 4, the full pipe 7
Holes 14d and 14e are provided in the silencing chamber 5 to communicate the silencing chamber 4 with the passage 10 and the passage 11, respectively, and in the silencing chamber 5, holes 14f and 14e are provided in the buff-full pipe 7 to communicate the silencing chamber 5 with the passage 10 and the passage 9, respectively.
14g is provided. Further, the end of the passage 13 on the expansion chamber 6 side, the rear end of the passages 9 and 10, the end of the passage 10 on the expansion chamber 6 side, and the first silencing chamber 3 and the second silencing chamber 4 in the passage 10. A closing plate 15 is provided between the two.

Therefore, in FIGS. 1 to 5, the expansion chamber 6
The exhaust gas enters the third silencing chamber 5 through the passage 9 and is muffled, then enters the second silencing chamber 4 through the passage 10, and further passes through the passage 11 into the first silencing chamber 3.
flows to Then, it passes through the passage 12 and the passage 13 and is discharged from the rear end of the passage 13. The passage 12 acts as a resonance tube. Batsuful pipe 7 is
It can be pulled out to the rear for cleaning.

As explained above, the rear of the muffler is constructed by partitioning the inside of the muffler outer cylinder into multiple vertical rows of silencing chambers with a partition plate, passing a buttful pipe through the hole provided in the partition plate, and forming a formed steel plate with appropriate bends inside the buttfull pipe. By inserting a separation plate, a plurality of passages in the axial direction are provided, and the silencing chambers are communicated through the passages, so that the passages connecting the silencing chambers are centrally provided in the Batsuful pipe. The structure can be simplified and manufacturing costs can be reduced. By removing the buttful pipe, all the passages can be removed and cleaned easily, so even in a two-stroke engine where tar accumulates, the engine can be properly cleaned and its functionality restored. Furthermore, the number of passages can be freely designed by appropriately selecting the cross-sectional shape of the separation plate.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a vertical side view, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line B-B in Fig. 1.
Fig. 4 is a cross-sectional view taken along the line C-C in Fig. 1, Fig. 5 is a partial perspective view showing the inside of the buttful pipe, and Fig. 6 is an enlarged cross-sectional view showing another embodiment of the buttful pipe. . 1...Muffler outer cylinder, 2...Partition plate, 3, 4, 5
...Soundless room, 7...Batsuful pipe, 9,10,
11, 12, 13...Aisle.

Claims (1)

[Scope of utility model registration request] A plurality of silencing chambers are formed in vertical lines inside the muffler outer cylinder using partition plates, a buttful pipe is passed through the hole provided in the partition plate, and a separating plate made of a formed steel plate bent appropriately is inserted into the buttful pipe. A plurality of passages are provided in the axial direction that are distinguished from each other by the above-mentioned method, and a hole is provided in the buttful pipe to communicate each passage with a predetermined silencing chamber, and a blocking plate is provided at an appropriate position of each passage, and the passage is A muffler for an internal combustion engine, characterized in that predetermined silencing chambers are communicated with each other by.