JPS62271919A - Muffler for motorcycle - Google Patents

Abstract

PURPOSE:To enable a sound absorbing material to be easily washed by fitting detachably a muffling member, which is made up of a pipe material and a sound absorbing material provided on the outer circumference thereof, to a muffler body. CONSTITUTION:On the rear end of a muffler body 20, a cover member 28 is detachably fixed by means of screw members 29. One end of a muffling member 30 is fitted to the cover member 28. In the cylindrical hollow space between an inside pipe 31 and an outside pipe 32, a sound absorbing material 33 such as glass wool or the like is fitted. After the screw members 29 have been removed and the muffling member 30 together with the cover member 28 has been drawn out from the muffler body 20, the sound absorbing material 33 is taken away to be washed. Thus, the washing of sound absorbing material can be easily carried out.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a muffler provided on the exhaust side of an internal heat engine, and particularly relates to a muffler for a motorcycle. is Japanese Patent Publication No. 57-8310
As shown in the publication, a muffler body is constructed by inserting and attaching a muffling member from the rear end of the muffler body, which communicates with the outside air from an expansion chamber within the muffler body.

This sound deadening member has a double-tube structure including an inner tube having a plurality of punched holes formed on one circumferential surface and an outer tube that covers the hole-forming portion of the inner tube. The cylindrical gap between the inner and outer tubes is filled with a sound absorbing material such as glass wool. So.

The expansion chamber of the muffler cancels and absorbs the pressure fluctuations of the exhaust explosion sound, and the reduced sound is further absorbed and reduced by the sound-absorbing material.

Problems to be Solved by the Invention However, if the sound-absorbing member is used for a long time, tar and the like contained in the exhaust gas will adhere to and stain the sound-absorbing material, reducing the sound-dampening effect of the sound-absorbing member. Therefore, it is necessary to clean the sound deadening member and remove dirt from the sound absorbing material.

However, in the conventional muffler structure, the sound-absorbing member is fixed to the muffler body, and maintenance work such as cleaning the sound-absorbing material of the sound-absorbing member is extremely difficult and time-consuming. Furthermore, even if the sound-absorbing member is removable, the sound-absorbing member is constructed by forming punching holes in the inner tube of a double-pipe structure, so it is not possible to check the degree of cleaning of the sound-absorbing material, and it is difficult to ensure that the sound-absorbing material is properly cleaned. It was impossible to clean properly.

The present invention has been made in view of the above points, and an object of the present invention is to provide a muffler for a motorcycle in which the sound absorbing material of a sound deadening member can be cleaned reliably and easily.

Means for Solving the Problems The present invention provides a sound deadening member that serves as a passage communicating from an expansion chamber in a muffler main body to the outside air side, and a pipe member that forms the passage;
A sound absorbing section is provided on the outer periphery of the pipe material, and the sound absorbing section is located within the muffler main body, and the sound damping member is detachably attached to the muffler main body.

According to the present invention, the sound deadening member is detachably attached to the muffler body, so that the sound deadening member can be removed from the muffler body and cleaned. Furthermore, since the sound-absorbing part is provided on the outer periphery of the sound-absorbing member, maintenance work such as cleaning the sound-absorbing part, which is particularly easily soiled, can be easily performed.

Examples Nine examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a schematic structure of a motorcycle to which an embodiment of the present invention is applied, FIG. 2 is a sectional view showing the structure of a muffler for a motorcycle according to the present invention, and FIG. 3 is a main part thereof. FIG. 3 is a cross-sectional view showing the structure.

In FIG. 1, an engine 11 is mounted in the center of a vehicle body 10 of a motorcycle. One end of an exhaust pipe 12 is attached to the exhaust side of the engine 11. exhaust pipe 1
2 extends between the rear portions of the vehicle body 10 along the lower portion of the vehicle body 10. A muffler 13 is connected to the other end of the exhaust pipe 12. The muffler 13 is a driving rear wheel 1 of the vehicle body 10.
It is attached to extend along one side of the vehicle body 10 toward the rear of the vehicle body 10.

The muffler 13 has a cross-sectional structure shown in FIG. 2, for example. The muffler main body 20 of the muffler 13 is formed of a hollow tube with a tapered cane that gradually widens from the front end toward the rear end. The rear end of the exhaust pipe 12 is fitted into the front end of the muffler main body 20. In the hollow of the muffler body 20.

A first partition plate 21 and a second partition plate 22 that partition the inside of the muffler main body 20 into three chambers in the front-rear direction are attached at intervals. The partition plates 21 and 22 define a first expansion chamber 23, a third expansion chamber 25, and a second expansion chamber 24 from the front of the muffler body 20. In the first partition plate 21.

A hole 211 for draining the plating solution and a hole 212 for attaching a pipe are formed. A lid 213 is provided on the first expansion chamber 23 side of the plating solution draining hole 211 to prevent exhaust gas colliding with the first partition plate 21 surface from flowing into the third expansion chamber 25 through the hole 211. is installed. On the other hand, the second partition plate 22 has holes 221 and 222 for attaching pipes.
Three holes are formed: and a hole 223 for attaching a sound deadening member. Hole 212 for installing hole pipe in first partition plate 21
The first inner pipe 26 is fitted into one pipe attachment hole 221 of the second partition plate 22, and the first inner pipe 26
6 are interposed and installed in the first and second expansion chambers 23, 24, respectively. by this first inner pipe 26.

A passage is formed that communicates the first expansion chamber 23 and the second expansion chamber 24. A second inner pipe 27 is provided in the other pipe attachment hole 222 of the second partition plate 22.
is installed. This second inner pipe 27
Thus, a passage is formed that communicates the second expansion chamber 24 and the third expansion chamber 25.

A lid member 28 that closes the second expansion chamber 24 to the outside air is removably attached to the rear end of the muffler main body 20. The lid member 28 is! ! ! It is formed approximately in the shape of a cylindrical disk,
It is fitted and attached to the rear end of the muffler main body 20. On the circumferential surface of the lid member 28, female screw portions 281, 282, . . . are formed at several locations at regular intervals. On the other hand, the rear end peripheral edge of the muffler body 20 has screw mounting holes 201 corresponding to the female threads 281, . . . of the lid member 28.・・・
・is formed. The lid member 28 is attached to the muffler main body 20
Screw member 29 from the outside. It is fixed with screws through ....

One end of a tubular sound deadening member 30 is attached to the lid member 28 . The sound deadening member 30 extends forward from the lid member 28, and the other end is removably fitted into the sound deadening member mounting hole 223 of the second partition plate 22 described above.

The other end of the muffling member 30 is inserted into the third expansion chamber 25 .

This muffling member 30 forms a passage that communicates the third expansion chamber 25 with the outside air side.

As shown in FIGS. 2 and 3, the sound deadening member 30 has a double pipe structure including an inner pipe 31 and an outer vibrator 32. Both ends 32L 322 of the outer pipe 32 are folded inward, and both ends 321, 322 of the outer pipe 32 are welded to both ends of the inner pipe 31. A cylindrical hollow space between the outer pipe 32 and the inner vibe 31 thus formed is filled with a sound absorbing material 33 such as glass wool. The outer pipe 32 has a large number of punching holes 323, 323. ... is formed. Hole 323 of this outer pipe 32.・When the sound deadening member 30 is installed as shown in FIG. 2, the second expansion chamber 24
It is formed around the entire circumference between the second partition wall plate 22 and the lid member 28 located at.

In this way, the sound-absorbing member 30 includes a sound-absorbing material 33 on the outer circumference of the inner pipe 31, which serves as a passageway communicating the third expansion chamber 25 with the outside air side, and a large number of punching holes 323 covering the sound-absorbing material 33. A sound muffling section is provided, which consists of an outer pipe 32 formed with an outer pipe 32. Therefore, this sound deadening member 30 is
Inside the second expansion chamber 24, the sound absorbing material 33 has a muffling effect of absorbing the exhaust explosion sound.

Maintenance for cleaning the sound deadening member 30, particularly the sound absorbing material 33, of the muffler 13 configured as described above is performed by removing the sound deadening member 30 together with the lid member 28 from the muffler main body 20, as shown in FIG. This removal is performed using the screw member 29 that fixes the lid member 28. . . , and pull out the muffler body 20 along with the cover member 28 from the muffler body 20. The installation is carried out by inserting the IF sound member 30 into the muffler main body 20 and fitting its tip into the sound deadening member mounting hole 223 of the second partition plate 22, and then inserting the cover member 28 into the rear end of the muffler main body 20. This is done by fitting the lid member 28 into the muffler body 20 and screwing it onto the muffler body 20. In this way, the structure is such that the sound deadening member 30 can be easily attached and detached.

In this way, the muffling member 30 is removed from the muffler main body 20 and cleaned. This sound deadening member 30 has a large number of punching holes 3211 formed in the outer pipe 32, so that the outer pipe 32 and the inner pipe 32
The degree of cleaning of the sound absorbing material 33 packed between the two can be confirmed. Further, since a large number of punching holes are formed in the outer pipe, the sound absorbing material 33 of the sound deadening member 30 can be easily and reliably cleaned.

Effects of the Invention As explained above, according to the muffler for motorcycles of the present invention, the sound deadening member is removable from the muffler body, and the outer circumference of the pipe material serves as the sound deadening part, so that the sound deadening member can be easily removed from the muffler body. Cleaning can be performed easily and reliably. Therefore, it becomes easier to perform maintenance on the muffler by performing r'51i.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic structure of a motorcycle to which a muffler according to the present invention is applied, FIG. 2 is a sectional view showing the structure of a muffler for a motorcycle according to the present invention, and FIG. 3 is a main part thereof. FIG. 2 is an enlarged sectional view of main parts showing the structure of FIG. 13...Muffler, 20...φ muffler body, 21.22...O partition plate, 23.24.25...expansion chamber, 26.27.Inner vibe forming the head passage 28...
・Lid member, 30-・O sound deadening member, 31-・Inside pipe, 32・・Cloudy outside pipe, 321・・Punching hole, 33・・Sound absorbing material.

Claims (1)

[Claims] (1) A sound-absorbing member that becomes a passage communicating with the outside air side from the expansion chamber in the muffler main body is formed by a pipe material forming the passage and a sound absorbing part provided on the outer periphery of this pipe material, and the sound absorbing part is A muffler for a motorcycle, characterized in that the muffler is located within a muffler main body, and the muffler is detachably attached to the muffler main body.