JPH072974Y2 - Muffler with a cover for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a muffler with a cover for a motorcycle.

[Conventional technology and its problems]

A cover may be attached to the muffler to block heat from the exhaust gas.

As a method of attaching the cover, for example, Japanese Utility Model Laid-Open No. 53-71139 discloses a technique of welding a mounting member to the outer wall of the muffler and fixing the cover to the muffler with a screw via the mounting member.

However, in general, the muffler has a tubular shape and the outer plate has a round shape, so that it is difficult to weld the mounting member.

Further, in the muffler having a divided structure, a reinforcing rod is used to ensure rigidity. However, in that case, since the number of parts is increased correspondingly with the above-mentioned mounting bracket, a muffler that also serves as a mounting bracket and a reinforcing rod has been proposed (see, for example, Japanese Utility Model Publication No. 55-10577).

FIG. 4 is a sectional view of an essential part of such an attached muffler. Reference numerals a and b denote a cover and a muffler, respectively.

The cover a covers the muffler b with a space c in a separated state. Space c between cover a and muffler b
Is provided by the upper and lower ends of the reinforcing rod e having the upper and lower ends in FIG. 4 inserted and fixed in a through hole d provided in the muffler b in a protruding state. Since the space c prevents the muffler b and the cover a from contacting each other, the space c acts as an adiabatic space for preventing high heat from the muffler b from being transmitted to the cover a.

The through hole d is formed by drawing a part of the outer wall plate of the muffler b into a tubular shape, and a heat insulating pipe f as a heat insulating member is externally fitted to the reinforcing rod e inserted in the through hole d. Has been done. By externally fitting the heat insulating pipe f to the reinforcing rod e, the heat of the muffler b, which has become high in heat, is less likely to be transmitted to the cover a.

By the way, the original role of the muffler b is to suppress the occurrence of an explosion sound. Therefore, inside the muffler,
A sound absorbing element (not shown) such as a sound absorbing material is provided. In order to enhance the sound absorbing effect of the muffler by the sound absorbing element, it is preferable to make the proportion of the reinforcing rod e in the muffler as small as possible to increase the proportion of the sound absorbing element.

However, when the reinforcing rod e is thinned for that reason, the diameter of the pipe f, which is a heat insulating material, is accordingly reduced, and the effect of preventing heat transfer from the muffler b to the cover a is reduced in exchange for the enhancement of the sound absorbing effect. Will end up.

Therefore, it has been desired to provide a new technique capable of sufficiently satisfying the heat insulation from the muffler to the cover even if the reinforcing rod is made thin in order to increase the proportion of the sound absorbing element in the muffler.

In addition, there is a demand that the space c is not only used as a heat insulating space but also used effectively.

[Purpose of device]

The muffler with a motorcycle cover of the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to increase the proportion of sound absorbing material such as a sound absorbing material in the muffler and to cover the muffler. To provide a muffler with a cover for a motorcycle that satisfies the heat insulation from the muffler to the muffler and that can be effectively used not only as a space for heat insulation provided between the muffler and the cover It is in.

[Means for Solving the Problems] The muffler with a motorcycle cover according to the present invention solves the above problems and is as follows.

That is, the muffler with a motorcycle cover of the present invention is
The left and right outer plates formed by pressing a steel plate into a bowl shape are joined together in the middle and welded, and a plurality of muffling chambers are internally configured by a partition plate having a communication hole, and at least the left and right outer plates. The present invention relates to a muffler with a cover for a motorcycle, which includes a cover that covers an outer plate located outside the vehicle with an appropriate space. A reinforcing rod having a screw hole formed at one end is fixed to the outer plate with both ends thereof penetrating between the left and right outer plates. A collar interposed between an end surface on the cover side and an inner surface of the cover to separate the muffler from the cover, and the screw hole of the rod body for fixing the cover to the rod body via the collar. A screw screwed from the outer surface side of the cover, an inner side heat insulating gasket interposed between both ends of the collar and inside the cover, and an screw interposed between the outer surface of the cover and the screw head of the screw. It is characterized in that the outer side heat insulating gasket is located outside the cover.

[Action]

Therefore, according to the muffler with a cover for a motorcycle of the present invention, a reinforcing rod having a screw hole formed at one end is fixed to the outer plate while both ends thereof are penetrated between the left and right outer plates. A rod having a unitary structure, a collar interposed between an end surface of the rod on the cover side and an inner surface of the cover, and a collar for separating the muffler from the cover; A screw that is screwed into the screw hole of the rod from the outer surface side of the cover to fix the rod body, an inner heat insulating gasket interposed between both ends of the collar and located inside the cover, and the outer surface of the cover. Since the outer side heat insulating gasket is located outside the cover by being interposed between the screw head and the screw head of the screw, the reinforcing rod has its constituent members arranged in series in the longitudinal direction. . Each of the heat insulating gaskets, which is one of the constituent members, is not located inside the muffler but is arranged between the muffler and the cover. In other words, only the rod body is placed inside the muffler, and the heat insulating gaskets are not placed around the rod body. Therefore, the proportion of the reinforcing rod in the muffler depends only on the rod body.

〔Example〕

Hereinafter, a muffler with a cover for a motorcycle according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a muffler with a cover for a motorcycle according to the present invention, FIG. 2 is a cross-sectional view at a proper position of FIG. 1, and FIG. 3 is an enlarged detailed cross-sectional view of an arrow portion in FIG.

The muffler 1 with a cover for a motorcycle includes a muffler 2 and a cover 4.

The muffler 2 is formed by welding left and right muffler outer plates 4l, 4r, which are formed by pressing a steel plate into a bowl shape, and are welded together in the middle. 8u
8d is formed by being partitioned by the partition plate 9.
A communication hole 9a is formed in the partition plate 9, and the communication hole 9a is formed.
The silencing chambers 8u and 8d are communicated with each other.

The exhaust pipe 2 extending from a cylinder (not shown) is connected to the muffling chamber 8u, and the exhaust gas (not shown) that has entered the muffling chamber 8u from the exhaust pipe 2 passes through the communication hole 9a and is connected to the muffling chamber 8d.
To the outside through the tail tube 10 from the muffling chamber 8d. In addition, each muffling room 8u ・ 8d has a corresponding muffling room 8u ・ 8d
Reinforcing bars 6/6/6/6 that penetrate through the
Are arranged and fixed at appropriate positions in the longitudinal direction of the muffler.

The reinforcing rod 6 includes a rod body 12 located inside the muffler and a rod body 12
A collar 16 interposed between the cover side end surface 12a 'and the cover inner surface 4i, a screw 18 for fixing the cover 4 to the rod body 12 via the collar 16, and a screw 18 interposed between both ends of the collar 16. Inside insulation gasket located inside the cover 20
・ An outside heat insulating gasket which is located between the outer surface of the cover 4o and the screw head 18h of the screw 18 and is located outside the cover
It consists of 22 and.

The rod body 12 has a cover-side end portion 12a and a non-cover-side end portion 12b, which are the end portions thereof, slightly protruded from the muffler outer plates 4l and 4r, and are fixed to the muffler 2 by an appropriate fixing means such as welding. It has a single structure. And the end 12
A screw hole 24 into which the screw 18 is screwed is formed in the cover-side end 12a of the a and 12b.

The collar 16 is a tubular body having openings at both ends for separating the muffler 2 and the cover 4 and forming a space 26 therebetween. Since the space 26 prevents the muffler 2 and the cover 4 from contacting each other, the space 26 acts as a heat insulating space for preventing high heat from the muffler 2 from being transmitted to the cover 4.

The screw 18 is adapted to be screwed into the screw hole 14 from the outer surface 4o side of the cover 4.

Inner insulation gasket 20 and outer insulation gasket 22
Is a disk-shaped heat insulating material having the same shape.

Thus, according to the muffler 1 with a cover for a motorcycle, the reinforcing rod 6 includes the rod body 12 having a unitary structure in which the screw hole 14 is formed in the cover side end portion 12a, and the cover side end surface 12a 'of the rod body 12. The muffler 2 and the cover 4 are interposed between the cover inner surface 4i.
A collar 16 for separating the cover 4 from the outer surface side of the cover 4 in a screw hole 14 of the rod 12 for fixing the cover 4 to the rod 12 via the collar 16; Inner side heat insulating gasket located inside the cover interposed between both ends of
The reinforcing rod 6 is composed of the members 20 and 20 and the outer side heat insulating gasket 22 which is located between the cover outer surface 4o and the screw head 18h and is located outside the cover.
12, 16, 18, 20, 20, and 22 will be arranged in a series.

And each heat insulating gasket which is one of these constituent members
20.20 and 22 will not be located at least inside the muffler 2. In other words, only the rod body 12 is placed inside the muffler 2, and the heat insulating gaskets 20, 20 and 22 are not arranged around the rod body 12.

Therefore, the proportion of the reinforcing rod 6 in the muffler 2 depends only on the rod body 12, and if the rigidity of the rod body 12 is increased, the reinforcing rod 6 can be thinned accordingly, so that the sound absorbing element in the muffler 2 is reduced. Can take a large proportion.

Further, since the inner side heat-insulating gaskets 20 and 20 are interposed at both ends of the collar 16 and the outer side heat-insulating gasket 22 is interposed between the cover outer surface 4o and the screw head 18h, the rod 12 Insulation gaskets can be gathered in a series in the space 26 on one end side and its vicinity. Because of this, the space
26 not only functions as a heat insulating space as described above, but can also be effectively used as a space for disposing a heat insulating gasket.

Furthermore, the size of the space 26 between the muffler 2 and the cover 4 can be freely adjusted by adjusting the length of the collar 16 as appropriate, so changing the collar 16 alone can be applied to mufflers with different types. You can It is therefore economical.

Further, since the left and right muffler outer plates 4l, 4r are connected by the reinforcing rods 6, 6, 6, 6 to enhance the rigidity, it is possible to reduce the generation of vibration noise due to vibration.

Furthermore, since the diameter of the reinforcing rod 6 can be set to the minimum diameter required for fastening the screw 18, the weight does not increase even if the rigidity is improved.

[Effect of device]

In order to effectively suppress the explosion sound, it is possible to increase the proportion of the sound absorbing element such as the sound absorbing material in the muffler, and it is also possible to satisfy the heat insulation from the muffler to the cover.

Further, the space between the muffler and the cover not only functions as a heat insulating space, but can also be effectively used as a space for disposing the heat insulating gasket.

[Brief description of drawings]

1 is a side view of a muffler with a cover for a motorcycle according to the present invention, FIG. 2 is a transverse sectional view according to FIG. 1, FIG. 3 is an enlarged detailed sectional view of a portion indicated by an arrow A in FIG. 2, and FIG. [FIG. 3] is a diagram for explaining a conventional technique. (Description of symbols) 1 ... muffler with a motorcycle cover, 2 ... muffler,
4 ... Cover, 4i ... Cover inner surface, 4o ... Cover outer surface, 6 ... Reinforcing rod, 12 ... Rod body, 12a ... Cover side end portion, 12a '... Cover side end surface, 16 ... Collar, 18 ... Screw, 18h ... Screw head , 20 ... Insulation gasket on the inside, 22 ... Insulation gasket on the outside, 24 ... Screw hole (of rod 12)

Claims (1)

[Scope of utility model registration request] 1. A left and right outer plate formed by press-molding a steel plate into a bowl shape and joined together in the middle, and a plurality of muffling chambers are formed inside by a partition plate having a communication hole. In a muffler with a cover for a motorcycle, which includes a cover that covers at least the outer plate outside the vehicle body with an appropriate space, a reinforcing rod having a screw hole formed at one end thereof is provided with both ends of the left and right outer plates. While being fixed to the outer plate in a state of being penetrated between, this reinforcing rod and a rod body of a unitary structure,
A collar interposed between an end surface of the rod body on the cover side and an inner surface of the cover for separating the muffler and the cover, and the rod body for fixing the cover to the rod body via the collar. A screw screwed into the screw hole from the outer surface side of the cover, an inner heat insulating gasket interposed between both ends of the collar and located inside the cover,
A muffler with a cover for a motorcycle, characterized in that the muffler with a cover is formed between the outer surface of the cover and the screw head of the screw and is positioned outside the cover.