JPS60162009A - Silencer mounting structure - Google Patents

Abstract

PURPOSE:To enhance the strength and durability of mounting, by using a bracket to hold a muffler made of a compressed nonmetallic silencing material, so that the bracket is in surface contact with the peripheral portion of the muffler. CONSTITUTION:A muffler 10 formed by compressing a nonmetallic silencing material is held by the holding portion 15 of a bracket 13 made separately from the muffler, so that the bracket is in surface contact with the peripheral portion of the muffler. As a result, the strength of mounting is enhanced, and the vibration of the muffler is damped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for mounting a muffler 6 in an exhaust system for an internal combustion engine.

Conventionally, a muffler for an exhaust system for an internal combustion engine has a structure in which a cylindrical body forming a chamber is made of a metal plate such as a steel plate, and a sound deadening material such as glass wool is pasted on the inner surface of the body. It has been known.

However, silencers with this structure are heavy because they use a metal plate for the main body, and the process tends to be complicated due to the work of pasting the sound deadening material on the inner surface of the main body, and the manufacturing cost is high. There were also problems such as the high cost.

Therefore, the applicant of the present application has recently proposed a silencer using molded glass wool or the like.

This muffler is made by compressing and shaping a muffler such as cotton-like glass wool to form a muffler main body in the desired shape.The inner surface of the main body functions as a sound muffler as it is, so it is different from conventional mufflers. There is no need to paste a separate sound deadening material inside the main body, and by impregnating the outer surface with heat-resistant resin and curing it, the necessary mechanical strength can be obtained without using a metal plate. Therefore, the above-mentioned problem does not occur.

However, to a silencer formed by compressing a sound-absorbing material such as glass wool, mounting metals cannot be easily and firmly attached by means such as welding.
Compared to the case where the main body is formed of a metal plate, more ingenuity is required in the mounting structure and securing the mounting strength.

This invention was made in view of the above-mentioned circumstances, and when a silencer is formed by compressing a non-metallic sound-absorbing material such as glass wool, the load acting on the mounting portion of the silencer is It is an object of the present invention to provide a mounting structure for a silencer that can prevent the effect from concentrating on a narrow area, thereby increasing mounting strength and improving durability. The feature is that a bracket separate from the silencer is used, and the bracket has a connecting part for fixing it to another member, and a curved part along the peripheral wall of the silencer, and a surface facing the peripheral wall. The silencer is structured to include a holding part that contacts and grips the peripheral wall, or holds the silencer by being gripped by the peripheral wall.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a side view of a motorcycle equipped with a silencer according to one embodiment, in which 1 is a front wheel, 2 is a rear wheel, 3 is a body frame, 4 is a fuel tank, 5 is a seat, 6 is a front cowling, and 7 is a side view of a motorcycle equipped with a silencer. 8 is an internal combustion engine, and 8 is an exhaust system connected to the internal combustion engine 7.

The exhaust system 8 includes an exhaust pipe 9 connected to an exhaust boat of the internal combustion engine 7, and a muffler 10 connected to the rear end of the exhaust pipe 9.

As shown in FIG. 2, the muffler 10 is formed into a cylindrical shape by joining two half members 11 and Jl 2, each having a semicircular cross section, facing each other.
It is fixed to a step holder 14 screwed to the vehicle body frame 3 via.

These half members 11 and 12 are shaped by compressing a non-metallic sound deadening material such as cotton-like glass wool, and the outer surface of each half is impregnated with heat-resistant resin and hardened. This gives the necessary strength.

The bracket 13 includes a holding part 15 that holds the muffler 10, and a holding part 15 that is connected to other members (step holder 1).
4) and a connecting portion 16 for fixing to. The protective part 15 is formed by bending a metal plate into an annular shape according to the outer diameter of the silencer 10, and has flanges 15a and 15b formed at both adjacent ends, and one flange 15a.
17. has a female thread, and the other flange 15bK has a through hole 15c formed therein, and is screwed into the female thread after being fitted onto the silencer 10. ．． 17, it comes into surface contact with the outer circumferential surface of the silencer 10 with a wide contact area as shown in FIG. Hold firmly. The connecting portion 16 has a through hole 16a through which a bolt 18 is inserted, as shown in FIG. 2, and is fixed to the step holder 14 by the bolt 18, as shown in FIG.

In this way, the holding part 15 of the bracket 13
If the muffler 10 is a vertically split type in which two half-split members 11 and 12 are joined facing each other as in the embodiment, the holding part 15 can tighten the muffler 10. The strength of the joint between the half members 11 and 12 can be increased by applying force.

In addition, if the bracket 13 is separate from the silencer 10 in this way and can be attached and detached from each other by the operation of 17.18, only one of the bracket 13 or the silencer 10 needs to be repaired or replaced. In such a case, only one of them needs to be repaired or replaced, and this can be done at a lower cost than in the conventional case where both are made of metal plates and integrated by welding. Furthermore, as described above, if the structure is such that the muffler 10 is held in surface contact with the peripheral wall of the muffler 10 as if the muffler 10 is held, the holding portion will be in surface contact over a wide range around the peripheral wall. The load acting on the muffler 10 due to vibrations transmitted from the vehicle body frame 3 side to the muffler 10 via the bracket 13 is uniformly distributed over a wide area, and is prevented from concentrating on a narrow area. Therefore, the mounting strength is increased and the durability is improved.

Further, when the silencer 10 is made of non-metal, the silencer 10
A certain degree of vibration damping effect can be expected on the surrounding wall itself, and since the bracket 13 is separate from the muffler 10, a vibration damping effect can also be expected between the two, so that vibrations generated in the muffler 10 itself due to exhaust pulsation etc. can be expected. The vibration caused by the car body flange 4
The influence of the vibration of the silencer 10 on the vehicle body frame 3 side can be suppressed as much as possible.

4 to 6 show other embodiments of the invention.

In this embodiment, the bracket 19 has two retaining parts 20.
It has 20. These holding parts 20.degree. 20 are formed into an annular shape that makes surface contact with the inner circumferential surface of the silencer 10, which is formed by joining the half members 11 and 12 facing each other, and the end portions thereof are provided with markings as shown in FIG. As shown, a separator 21 that partitions the inside of the muffler IO is integrally formed. The connecting portion 22, which is fixed to another member (step holder 14), is connected to the 2
A notch 23 is formed in each half member 11.12 to allow the connecting portion 22 to protrude. Therefore,
In the assembled state, as shown in FIG. 6, only the connecting part 22 is exposed, and the other parts of the bracket 19 are hidden, so the appearance is good, especially when the silencer 10 is used on a motorcycle. The effect is great when the material is used as an exterior part.

Still, by providing two holding parts 20.20,
The effect of dispersing the load acting on the muffler 10 is also improved.

In addition, if the separator 21 is provided like the holding part 20 described above, compared to the case where the separator 21 is formed by a separate member and fixed to the inner circumferential surface of the muffler 0,
Bracket 1 reduces the number of parts, improves assembly efficiency, and can be firmly attached to the vehicle frame.
Since the structure is such that the separator 21 is joined to the separator 9, the attachment strength of the separator 210 is also improved.

In the above-described embodiment, both the holding parts 15 and 20 are annular, but the point is that they are in surface contact with the peripheral wall of the muffler 10, and are connected to each other by the surface pressure caused by the surface contact.
The structure may be such that the force acting between them is dispersed over a wide range; for example, a structure in which the structure contacts the peripheral wall of the muffler within about one circumference is also conceivable.

Further, in the above-described embodiment, since the muffler 10 is cylindrical, the holding parts 15.20 are also curved in a circular shape. Needless to say, if the cross-sectional shape is flat, it should be curved to follow that shape.

As explained above, the mounting structure of the silencer according to the present invention is such that a silencer formed by compressing a non-metallic sound-absorbing material is attached to the silencer using a bracket formed separately from the silencer. The bracket is fixed to a member, and the bracket is curved along the peripheral wall of the muffler, and includes a holding part that is in surface contact with the peripheral wall and grips the peripheral wall, or is in a state of being gripped by the peripheral wall, With the configuration in which the muffler is held by the holding part, the holding part comes into surface contact with the rotation of the peripheral wall over a wide range, so vibrations transmitted from other parts to the muffler via the bracket cause the muffler to be damaged. The load acting on the muffler is uniformly distributed over a wide range of the peripheral wall of the muffler, and is prevented from being concentrated in a narrow area. therefore,
Increased mounting strength and improved durability. In addition, if the muffler is made of non-metallic material, a certain degree of vibration damping effect can be expected on the surrounding wall of the muffler itself, and since the bracket holds the muffler through surface contact, the vibration damping effect can also be achieved between the two. Since this can be expected, the effect of the muffler's movement on other members can be suppressed as much as possible since the movement generated in the muffler itself due to exhaust pulsation is transmitted to other members.

[Brief explanation of the drawing]

Fig. 1 is a side view of a motorcycle equipped with an embodiment of the present invention, Fig. 2 is an exploded perspective view of the embodiment, Fig. 3 is an assembled view of the embodiment, and Figs. 4 to 6 are Another embodiment of the present invention is shown in which FIG. 4 is an exploded perspective view, FIG. 5 is a sectional view of the main part, and FIG. 6 is an assembled view. 7... Internal combustion engine, 8. Bent exhaust system, 1o. Bent silencer, 11... Half-split member, 12... Half-split member, 13. Plaquet for..., 14. Bent Step holder, 15... Holding portion, 16. Curved connecting portion, 19. Curved bracket, 2o... Holding portion, 22. Curved connecting portion. Figure 1 Figure 2 Figure 3 Figure 4 Figure 3

Claims (1)

[Claims] This is a mounting structure for a silencer, in which a silencer for an internal combustion engine exhaust system, which is shaped by compressing a non-metallic sound-absorbing material, is fixed to another member using a bracket formed separately from the silencer. The bracket includes a holding portion that is curved along the peripheral wall of the muffler and grips the peripheral wall by making surface contact with the peripheral wall, or holds the muffler by being gripped by the peripheral wall; A mounting structure for a silencer, comprising a connecting part for fixing the holding part to another member.