JPH0726950A - Muffler installation structure of motorcycle - Google Patents

Abstract

PURPOSE:To provide the muffler installation structure of a motorcycle for preventing falling-down of a spacer and buckling of a washer. CONSTITUTION:In the muffler installation structure of a motorcycle in which a damper member 32 is interposed between the bracket 26 of a muffler 22 side and the bracket 28 of a car body frame 11 side, a bolt hole 33 is formed in the center part of the damper member 32, inner circumferential surfaces of both opening parts 34, 34 of the bolt hole 33 are expanded toward radial direction outside in a taper shape. And also a spacer 35 is fitted in the bolt hole 33, and both opening parts 37, 37 of the spacer 35 are expanded toward radial direction outside in the taper shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler mounting structure for a motorcycle.

[0002]

2. Description of the Related Art A muffler, which is an exhaust system for a motorcycle, mainly comprises an exhaust pipe and a silencer. The front end of the exhaust pipe is directly connected to the exhaust port of the engine and fixed, while the rear end of the exhaust pipe is connected to a silencer, which is fixed to the vehicle body frame.

Generally, as shown in FIG. 7, a muffler includes a bolt 3 and a nut 4 mounted on a bracket 2 provided on a vehicle body frame via a bracket 1 provided on the muffler.
It is fixed by fixing means such as.

However, if the bracket 1 of the silencer is directly fixed to the bracket 2 of the vehicle body frame, the vibration of the vehicle body is transmitted to the muffler, which is not preferable. Therefore, for example, a rubber damper 5 having an H-shaped cross section is usually used for both the brackets 1. , 2 to prevent the transmission of vibration. Also, if the damper 5 is directly tightened with the bolts 3 or the like, the damper 5 will be deformed. Therefore, a metallic spacer 6 is fitted in the damper 5 and the one side end of the spacer 6 and the bolt head 3a are fitted. Deformation of the damper 5 is prevented by interposing the washer 7.

[0005]

However, the rubber damper 5 is thermally deformed by the heat of the silencer after a long time has passed,
The inner diameter of the damper 5 increases. If the inner diameter of the damper 5 is enlarged, the spacer 6 will fall off during disassembly and maintenance of the muffler, which is not preferable.

Further, since the contact surface 6a of the spacer 6 to the washer 7 is small, the washer 7 may buckle if the washer 7 deviates even a little, and as a result, the bolt 3 becomes loose and the silencer is improperly fixed. turn into.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a muffler mounting structure for a motorcycle which prevents the spacer from falling off and the washer from buckling.

[0008]

A muffler mounting structure for a motorcycle according to the present invention is provided in order to solve the above-mentioned problems.
As described in claim 1, a bracket on the muffler side,
In a motorcycle muffler mounting structure in which a damper member is interposed between a bracket on the body frame side, a bolt hole is formed in the center of the damper member, and the inner peripheral surfaces of both openings of the bolt hole are radiused. On the other hand, a spacer is fitted in the bolt hole while expanding outward in the taper direction, and both openings of the spacer are expanded outward in the taper direction in the radial direction.

[0009]

According to the present invention having the above-mentioned structure, in the muffler mounting structure for a motorcycle in which the damper member is interposed between the bracket on the muffler side and the bracket on the vehicle body frame side, the central portion of the damper member is A bolt hole is formed, and the inner peripheral surfaces of both openings of the bolt hole are expanded radially outward in a tapered shape, while a spacer is fitted in the bolt hole, and both openings of the spacer are radially expanded. Since the taper is expanded outward, the spacer is prevented from falling off and the washer is buckled.

[0010]

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

FIG. 1 is a right side view showing an example of a motorcycle to which the present invention is applied.

In FIG. 1, the motorcycle 10 has a vehicle body frame 11, an engine 12 is mounted in the lower center of the vehicle body frame 11, and a fuel tank 13 is provided above the vehicle body frame 11.

A head pipe 14 is provided in front of the vehicle body frame 11, and a steering mechanism 15 is provided on the head pipe 14. The steering mechanism 15 includes a front fork 1 that rotatably supports a front wheel 16.
7, a handlebar 18, etc. are provided, and are pivotally attached to the head pipe 14 so as to be rotatable left and right.

On the other hand, a swing arm 21 which rotatably supports a rear wheel 20 is pivotally mounted on a pivot shaft 19 which is erected in the lower center of the body frame 11 so as to be swingable around the pivot shaft 19.

The engine 12 has a muffler 2 which is an exhaust system.
2 are connected. The muffler 22 includes an exhaust pipe 23 and a silencer 2.
4 is provided, and the upstream side of the exhaust pipe 23 is the engine 12
Is connected to an exhaust port 25 provided in front of. Exhaust pipe 2
3 extends rearward along the right side surface of the vehicle body, and a silencer 24 is connected to the downstream side of the exhaust pipe 23.

FIG. 2 is an enlarged view of the periphery of the silencer 24 of FIG.

In FIG. 2, mounting brackets 26 and 27 are provided on the upper surface of the muffler 24 and the rear end of the exhaust pipe 23, respectively, and a washer 30 is interposed between fixing brackets 28 and 29 provided on the vehicle body frame 11. It is fixed by a fixing means such as a bolt 31.

FIG. 3 is a sectional view taken along line XX of FIG.

As shown in FIG. 3, a rubber damper 32, which is a damper member having an H-shaped cross section, is fitted to the mounting bracket 26 of the silencer 24 for the purpose of preventing the vibration of the vehicle body from being transmitted to the muffler 22. To be dressed. As shown in FIG. 4, a bolt hole 33 is formed in the center of the damper 32, and the inner peripheral surfaces of both openings 34, 34 of the bolt hole 33 are tapered outward in the radial direction.

A metal spacer 35, for example, is fitted into the bolt hole 33 of the damper 32. As shown in FIG. 5, the spacer 35 has a cylindrical shape having a bolt hole 36, and both openings 37, 37 thereof have a shape corresponding to the inner peripheral surface of both openings 34, 34 of the bolt hole 33 of the damper 32. , Tapered outwardly in the radial direction.

A washer 30 is provided on the right side of the damper 32 in which the spacer 35 is fitted in FIG. The inner diameter of the opening 30a of the washer 30 is smaller than the inner diameter of the opening 37 of the spacer 35.

A nut 38 is welded and fixed to the left side of the fixing bracket 28 provided on the vehicle body frame 11 in FIG.

Next, the operation of this embodiment will be described.

When mounting the muffler 22, which is an engine exhaust device, on a vehicle body, first, a rubber damper 32, which is a damper member having an H-shaped cross section, is fitted to a mounting bracket 26 provided on the upper surface of the silencer 24. Next, a spacer 35 made of metal, for example, is fitted into the bolt hole 33 formed in the center of the damper 32.

In the bolt hole 33 of the damper 32, the inner peripheral surfaces of both openings 34, 34 of the damper 32 are expanded radially outward, while both openings 37, 37 of the spacer 35 are bolts of the damper 32. The openings 34 and 37 are fitted into the holes 33, since the openings 34 and 37 are tapered outward in the radial direction so as to have a shape corresponding to the inner peripheral surfaces of the openings 34 and 34. Since the openings 34 and 37 are fitted to each other, even if the inner diameter of the bolt hole 33 of the damper 32 is enlarged by the heat of the muffler 24, the spacer 35 does not drop off when the muffler 22 is disassembled and maintained. .

The mounting bracket 26 of the muffler 24 having the damper 32 mounted thereon has a nut 38 welded to a fixed bracket 28 on the vehicle body frame 11 side with a washer 30 interposed.
It is fixed with a bolt 31.

Since both openings 37, 37 of the spacer 35 are tapered outward in the radial direction, the area a of the contact surface 6a of the conventional spacer 6 with the washer 7 shown in FIG. The area A of the contact surface 35a of the spacer 35 of the present invention shown in FIG. 6B against the washer 30 and the outer diameter D of the spacer 35 are larger than the outer diameter d of the spacer 6.
Therefore, even if the washer 30 is slightly displaced, the contact surface 35a of the spacer 35 is always in contact with the washer 30, so that the washer 30 is prevented from buckling. As a result, bolt 3
The muffler 24 is securely fixed without the 1 being loosened.

Further, since the inner diameter of the opening 37 of the spacer 35 is larger than the conventional one, the bolt 31 can be easily inserted, and the muffler 22 can be easily assembled to the vehicle body frame 11.

Although the muffler mounting structure for the motorcycle has been described in the above-described embodiment, the present invention can be applied to mounting a member that generates a lot of vibration and becomes high temperature regardless of the structure.

[0030]

As described above, according to the muffler mounting structure for a motorcycle of the present invention, a muffler for a motorcycle in which a damper member is interposed between a bracket on the muffler side and a bracket on the vehicle body frame side. In the mounting structure, a bolt hole is formed in the center of the damper member, and the inner peripheral surfaces of both openings of the bolt hole are tapered outward in the radial direction, while a spacer is fitted in the bolt hole. Since the spacers are mounted and the both openings of the spacer are expanded radially outwardly, the spacer is prevented from falling off and the washer is buckled.

[Brief description of drawings]

FIG. 1 is a right side view of a motorcycle showing an embodiment of a muffler mounting structure for a motorcycle according to the present invention.

FIG. 2 is an enlarged view around the silencer.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a perspective view of a rubber damper.

FIG. 5 is a perspective view of a spacer.

6A and 6B are cross-sectional views showing the relationship between the spacer and the washer in the conventional example and the present example.

FIG. 7 is a cross-sectional view showing a conventional muffler mounting structure.

[Explanation of symbols]

 10 Motorcycle 11 Body Frame 12 Engine 22 Muffler (Engine Exhaust Device) 23 Exhaust Pipe 24 Silencer 26, 27 Muffler Side Mounting Bracket 28, 29 Body Frame Side Fixing Bracket 30 Washer 31 Bolt (Fixing Means) 32 Damper (Damper Member) 33 Damper bolt hole 34 Damper opening 35 Spacer 36 Spacer bolt hole 37 Spacer opening

Claims (1)

[Claims] 1. A muffler mounting structure for a motorcycle, wherein a damper member is interposed between a muffler-side bracket and a vehicle body frame-side bracket, and a bolt hole is formed in a central portion of the damper member. The inner peripheral surfaces of both openings of the hole are tapered outward in the radial direction, while spacers are fitted in the bolt holes, and both openings of the spacer are tapered outward in the radial direction. A muffler mounting structure for motorcycles that is characterized.