JPS6335157Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a muffler for a two-stroke engine mounted on a motorcycle or the like.

Since a two-stroke engine contains tar such as lubricating oil in the exhaust gas, the buttful pipe is assembled so that it can be inserted and removed from the rear end of the muffler, so that the buttful pipe and the inside of the muffler can be cleaned as needed. Also, recently, sound absorbing material has been wrapped around the rear part of the buttful pipe to further enhance the sound deadening effect. However, some people remove the sound absorbing material when cleaning the Batsuful pipe and use it without the sound absorbing material. Without sound absorbing material, the set sound reduction cannot be achieved, and the exhaust noise becomes louder, causing a nuisance to society.

In view of these points, this invention is an improvement in which the sound-absorbing material placed around the butt-full pipe is fixed to the muffler cylinder side and does not come off, while the butt-full pipe can be inserted and removed for cleaning. An example shown in will be described.

The muffler tube 1 has a silencing chamber 3 vertically partitioned by partition plates 2, and communicates with each other by a buttful pipe 4 penetrating through the partition plates 2.
The holder 5 has a cylindrical shape with a stepped portion, and has a number of small holes 6 in its narrow portion, into which a sound absorbing material 7 made of glass wool or the like is inserted. The holder 5 extends from the rear end of the muffler tube 1 to the last muffling chamber 3.
It is press-fitted into the muffler tube 1 and fixed to the muffler tube 1 with rivets 8 or the like. The baffle pipe 4 is provided with ventilation holes 9 and a large number of small holes 10 corresponding to the positions of the large number of small holes 6 of the holder 5. The buttful pipe 4 is inserted removably into the muffler cylinder 1 through the inside of the holder 5, and is fixed at the rear end to the holder 5 with a screw 11.

Thus, the buttful pipe 4 can be inserted or removed by removing the screw 11, and can be cleaned by removing it from the muffler tube 1. Since the sound absorbing material 7 is fixed to the muffler tube 1 side together with the holder 5, it cannot be removed. The exhaust gas passing through the buttful pipe 4 passes through the many small holes 10 of the buttful pipe 4 and the many small holes 6 of the holder 5, and the noise is absorbed by the sound absorbing material 7.
The sound silencing effect can be improved.

As explained above, this idea involves inserting a cylindrical sound-absorbing material around the outer periphery of a cylindrical holder with many small holes, and inserting the holder into the muffler cylinder from the rear end of the muffler cylinder. Since the buttful pipe, which is fixed to the cylinder and has many small holes inside the holder, can be inserted and removed, the buttful pipe can be removed and cleaned. Since the sound absorbing material is fixed to the muffler tube along with the holder, it cannot be removed. Furthermore, the noise can be absorbed by the sound absorbing material through the large number of small holes in the holder and the buttful pipe, resulting in a high sound deadening effect. Furthermore, although the muffler tube is sometimes plated, the holder with the sound-absorbing material attached can be inserted and fixed after the plating finish, so the plating liquid does not get on the sound-absorbing material, and workability is good. In this way, the inconvenience of removing the sound absorbing material for use can be avoided.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. 1...muffler tube, 4...butsuful pipe, 5...
...Holder, 6...Small hole, 7...Sound absorbing material, 10...
...Small hole.

Claims (1)

[Scope of utility model registration request] A cylindrical sound-absorbing material is fitted around the outer circumference of a cylindrical holder with many small holes, and the holder is inserted into the muffler cylinder from the rear end of the muffler cylinder and fixed to the muffler cylinder. A muffler for a two-stroke engine, characterized in that a buttful pipe with small holes is inserted and removed in a removable manner.