JPH06185355A - Exhaust pipe structure for motorcycles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an exhaust pipe structure for a motorcycle that can take out a silencer from a muffler body when disassembling and improve the appearance. [Structure] In an exhaust pipe structure of a motorcycle having a muffler in which a silencer 8 is loaded inside a muffler body 6,
The muffler body 6 is provided with an engaging portion 16 projecting toward the rear side on the inner periphery thereof near the connecting portion of the baffle pipe 5, and the flange member 17 fixed to the outer periphery of the baffle pipe 6 is inserted into the muffler body 6 at the time of insertion. A hook member 18 that engages with the engaging portion 16 is attached by a screw 19 so that the hook member 18 can be fastened freely, and the silencer 8 can be pulled out when the baffle pipe 5 is pulled out during disassembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe structure for a motorcycle.

[0002]

2. Description of the Related Art Automatic 2 equipped with a 2-stroke engine
In the wheeled vehicle, an engine 2 is mounted on a vehicle body frame 1 as schematically shown in FIG. 3, and an exhaust pipe 3 of the engine 2 is arranged from a front side of the vehicle body frame 1 to a lower side thereof and a rear side of the vehicle body frame 1. It is connected to a muffler 4 (second muffler) attached to the section. This muffler 4
In some cases, the structure may be decomposed to remove carbon accumulated inside.

The structure that allows the muffler 4 to be decomposed is
Conventionally, a baffle pipe 5 is inserted into a muffler body 6 as shown in the cross section in FIG. 4 or FIG.
A silencer 8 made of a sound absorbing material such as glass fiber is loaded between the inner circumference of the muffler body 6 and the inner cylinder 7. The baffle pipe 5 and the muffler body 6 are fixed to each other by welding to the inner circumferential surface of the muffler body 6. The flange 9 and the flange 10 welded to the outer peripheral surface of the baffle pipe 5 are butted against each other and screw 11
Or a flange 1 welded to the outer peripheral surface of the baffle pipe 5 as shown in FIG.
There is one in which the cylindrical portion 10a on the outer periphery of 0 and the outer peripheral surface of the muffler body 6 are fastened with a screw 11.

[0004]

However, in the structure shown in FIGS. 4 and 6, even if the screw 11 is removed and the baffle pipe 5 is pulled out from the muffler body 6, the silencer 8 is pressed by the flange 9, so the silencer 8 is pressed. I can't pull out 8. Further, in the structure shown in FIG. 5, the head portion 11a of the screw 11 appears on the outer peripheral surface of the muffler body 6, so that the appearance becomes unsightly.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an exhaust pipe structure for a motorcycle capable of taking out a silencer from a muffler body when disassembling and improving the appearance. And

[0006]

In order to achieve the above object, the present invention is directed to an exhaust pipe structure of a motorcycle having a muffler having a silencer mounted on the inner periphery of a muffler body.
An engaging portion protruding toward the inner side is provided on the inner periphery of the muffler body near the baffle pipe connecting portion, and a flange member fixed to the outer periphery of the baffle pipe is engaged with the engaging portion when the muffler body is inserted. The screw is attached so that it can be tightened freely, and the silencer can be pulled out when the baffle pipe is pulled out during disassembly.

[0007]

[Operation] For assembly of the baffle pipe and muffler body,
The silencer is loaded into the muffler body through the engaging part, and then the hook member is temporarily fixed to the flange of the baffle pipe with a screw and inserted into the muffler body. After the hook member exceeds the engaging part, the screw is inserted. By tightening, the hook member engages with the engaging portion and the baffle pipe and the muffler body are fixed.

When disassembling, the baffle pipe can be pulled out from the muffler body by performing the reverse operation to the above, and at the same time, the silencer can be pulled out.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

As shown in FIG. 1 which is a sectional view in a disassembled state and FIG. 2 which is an enlarged sectional view of an essential part in an assembled state, a connection portion 13 for connecting an outlet pipe 12 is formed at one end of the muffler body 6. A ring-shaped member 15 having a shape in which the outer circumference on the inner end side is narrowed is fixed to the inner peripheral surface near the other end by welding or the like. Form an engaging portion 16 slightly away from the inner peripheral surface of the muffler body 6.

An inner circumference of a flange member 17 having a substantially U-shaped cross section is fitted to the baffle pipe 5 and fixed thereto by welding or the like. An outer peripheral portion 17a of the flange member 17 is attached to an inner circumference of the muffler body 6. It is designed to fit without a gap. A silencer 8 is mounted on the inner circumference of the muffler body 6.

The vertical plane portion 17 of the flange member 17
The hook member 18 is attached to b by a screw 19. This hook member 18 is a horizontal part 18
The tip of a rises upward, and the tip bends in the opposite direction and bends in a hook shape to form a hook portion 20 that is hooked on the engaging portion 16, and the ground end of the hook member 18 is the flange member 17. It is a mounting portion 21 for fixing to the flat surface portion 17b, and can be fastened by a screw 19. A plurality of hook members 18 are annularly arranged with respect to the center of the baffle pipe 5.

In FIGS. 1 and 2, 22 is an O-ring for preventing gas leakage.

Next, the operation will be described.

When the silencer 8 is inserted into the muffler body 6 when the baffle pipe 5 and the muffler body 6 are assembled, the silencer 8 passes through the engaging portion 16 and is loaded along the inner surface of the muffler body 6. Then baffle pipe 5
The hook member 18 is temporarily fixed to the flange member 17 by a screw 19 and is inserted into the muffler body 6. When the hook portion 20 of the hook member 18 exceeds the engaging portion 16, the screw 19 is fastened to secure the hook member 18 to the hook member 18. If it is pulled back, the hook portion 20 is caught by the engaging portion 16 and further tightened, whereby the muffler body 6 and the baffle pipe 5 are firmly fixed (FIG. 2).

When disassembling the silencer 8 during replacement or cleaning, the screw 19 is loosened in the opposite manner to the above, and the hook member 1
The baffle pipe 5 can be pulled out by removing the hook portion 20 of the No. 8 from the engaging portion 16, and then the silencer 8 can be pulled out.

[0017]

As described above, according to the present invention, the silencer can be easily disassembled and taken out only by rotating the screw when replacing or cleaning the silencer, so that the disassembling work can be facilitated and the baffle pipe can be easily used. Since the screw for mounting is not visible on the peripheral surface of the Humara, the appearance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view in an exploded state showing an embodiment of an exhaust pipe structure according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part in the assembled state of FIG.

FIG. 3 is a schematic side view showing a motorcycle to which the present invention is applied.

FIG. 4 is a sectional view showing a conventional technique.

FIG. 5 is a cross-sectional view showing another conventional technique.

FIG. 6 is a sectional view showing still another conventional technique.

[Explanation of symbols]

 1 Body Frame 2 Engine 3 Exhaust Pipe 4 Muffler 5 Baffle Pipe 6 Muffler Body 8 Silencer 9, 10 Flange 11 Screw 16 Engagement Part 17 Flange Member 18 Hook Member 10 Screw 20 Hook Part 21 Attachment Part

Claims (1)

[Claims] 1. In an exhaust pipe structure of a motorcycle having a muffler having a silencer mounted on the inner periphery of a muffler body, an engagement projecting toward the inner side of the inner periphery of the muffler body near the baffle pipe connection portion. The flange member fixed to the outer periphery of the baffle pipe is provided with a hook member that engages with the engaging portion when the muffler body is inserted, and can be fastened by a screw so that the silencer can be pulled out when the baffle pipe is pulled out during disassembly. The exhaust pipe structure of the motorcycle characterized by the above.