JPS6131132Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a motorcycle muffler that prevents dirt on the muffler outer cylinder.

As shown in Figure 1, a motorcycle has an engine A.
A cylindrical muffler D is connected to the tail end of the exhaust pipe C connected to the exhaust hole B of the exhaust pipe C. The muffler D may extend rearward in a long and narrow manner along the side of the vehicle body, and its rear end may be directed diagonally upward and rearward. In this case, tar such as lubricating oil is mixed with the exhaust gas and discharged from the opening provided at the tail end of the muffler D. This tar drips along the rear end plug of the muffler D and the outer cylinder of the muffler D. Dirt and the like adhere to this, and dirt E forms mainly on the lower part of the outer cylinder of the muffler D.

This invention has been improved to avoid this problem, and the embodiments of the invention shown in FIGS. 2 to 4 will be described below.

The muffler outer cylinder 1 has an elongated cylindrical shape, and has a small gap 2 inside thereof, into which an inner cylinder 3 is inserted. The inside of the inner cylinder 3 is partitioned into a plurality of silencing chambers 5 by welding a plurality of partition walls 4,
The partition wall 4 at the front end is sandwiched between the muffler outer cylinder 1 and the inner cylinder 3 to form a small gap 2. The rear end of the inner cylinder 3 is welded to the rear end closing plate 6. A passage pipe 7 is provided in each of the partition wall 4 and the rear end closing plate to communicate with the silencing chamber 5. A through hole 8 is provided in the lower part of the rear end closing plate 6 to communicate with the small gap 2. Further, a punch hole 9 is provided in the lower surface of the muffler outer cylinder 1 at the front end of the small gap 2. The front end of the muffler outer cylinder 1 is connected to an exhaust pipe 10 connected to an exhaust hole of the engine.

The effect will be explained.

Exhaust gas discharged through the exhaust pipe 10 passes through the muffler chamber 5 in the muffler outer cylinder 1, passes through the pipe 7 one after another, and is repeatedly expanded and compressed to be muffled. Finally, it is released into the atmosphere from the passage tube 7 of the rear end closing plate 6. At this time, the tar contained in the exhaust gas is also released, but since the tar is heavier than the exhaust gas,
It hangs down along the rear end closing plate 6. This dripping tar enters the small gap 2 through the through hole 8 and falls to the ground through the extraction hole 9. In this way, the tar passes through the small gap 2 and escapes from the hole 9 in the front of the muffler outer cylinder 1.
Most of the muffler outer cylinder 1 can be prevented from becoming dirty.

As explained above, this invention creates a small gap inside the muffler outer cylinder and inserts the inner cylinder, and a through hole is drilled in the lower part of the rear end blocking plate to communicate with the small gap, and the front end of the small gap Since a vent hole is provided on the lower surface of the muffler outer cylinder, tar and moisture dripping from the rear end plug pass through the hole, enter the small gap, flow through the small gap, and fall from the vent hole.
For this reason, the muffler outer cylinder does not drip directly from the rear end blocking plate, and it is possible to prevent the muffler outer cylinder from becoming dirty. Furthermore, since the muffler outer cylinder and inner cylinder are double-layered, it is possible to prevent a reduction in radiated sound and reduce noise.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional example, Figures 2 to 4
The drawings show an embodiment of the present invention, in which Fig. 2 is a longitudinal side view, Fig. 3 is an enlarged view of the part seen in the direction of arrow A in Fig. 2, and Fig. 4 is an enlarged view of the part seen in the direction of arrow B in Fig. 2. . 1...Muffler outer cylinder, 2...Small gap, 3...Inner cylinder,
6... Rear end closing plate, 8... Through hole, 9... Extraction hole.

Claims (1)

[Scope of utility model registration request] Create a small gap inside the muffler outer cylinder and insert the inner cylinder, drill a through hole at the bottom of the rear end blocking plate to communicate with the small gap, and make a punch hole on the lower surface of the muffler outer cylinder at the front end of the small gap. A motorcycle muffler characterized by: