JP2003227333A - Attaching structure of muffler cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching structure of a muffler cover, by which the muffler cover is attachable to a muffler body with fewer parts easily and in a preferable condition in appearance. <P>SOLUTION: In this structure, a muffler cover 20 is attached to a cylindrical muffler body 10 including a cylinder body 11 and an end plate 12 at the end thereof. An outer peripheral edge 12a of the end plate 12 is bent outwardly so as to contact with an inner periphery of the cylinder body 11 of the muffler body 10, and a protrusion 13 is formed to the bent portion (the outer peripheral edge 12a). The protrusion 13 is inserted in an insertion port 22 formed along the inner face of the muffler cover 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler cover mounting structure for covering all or part of a muffler body (silencer) or its vicinity, and more particularly to a mounting structure suitable for a motorcycle or the like.

[0002]

2. Description of the Related Art For a muffler of a motorcycle or the like, a muffler cover is provided from an exhaust pipe (joint pipe, etc.) connected to an engine to a front end of a cylindrical muffler body (an upstream end with respect to exhaust flow). It may be attached (see FIG. 2 (a)). Since the exhaust pipe and muffler have the effect of impressing the appearance of the motorcycle, the muffler cover is used to give a smooth form to the relevant part or cover the discolored part due to the temperature rise.

When a muffler cover is used, a part of the muffler cover is often attached to the front end of the muffler body as shown in FIG. That is, first, as shown in FIG. 5B, the two plates 63 and 64 are attached to the outside of the end plate 62 that forms the muffler body 60 together with the tubular body 61, and the plates 63 and 64 are opened forward (toward the upstream side of exhaust gas). The insertion port 65 is formed. On the other hand, as shown in FIGS. 5 (a) and 5 (b), the rearward projection 72 is provided on the inner surface of the rear end portion of the muffler cover 70, and the rubber damper 75 is put on the projection 72. Damper 7
The muffler cover 70 is attached to the muffler body 60 by inserting the projection 72 with 5 into the insertion port 65. The front part (left side in FIG. 5) of the muffler cover 70 is fixed by winding a fixing piece (not shown) integrated with the inner surface around the exhaust pipe 6 with a band 73 in FIG. 5 (a). It is common to do.

[0004]

The structure as shown in FIG. 5 for mounting the muffler cover has room for improvement in the following points. That is, (a) It takes time and effort to form the insertion port 65, and the number of necessary parts is large. This is because the two plates 63 and 64 need to be integrated and welded to the end plate 62 of the muffler body 60. (B) A discontinuous portion (step, gap, etc.) between the outer peripheral surface of the cylindrical body 61 of the muffler body 60 and the outer surface of the muffler cover 70.
Is likely to be unstable. From the appearance, it is preferable that both surfaces are closely connected or have a constant gap or the like, but in order to always be in such a state without causing variations, the position of the insertion port 65, that is, the outer circumference of the cylindrical body 61 is required. 2 for face
Since the accuracy of the mounting position of the plates 63 and 64 (position in the radial direction on the muffler body 60) must be improved, it takes more time and labor to form the insertion port 65.

The invention of the claims solves such a problem, and provides a muffler cover mounting structure which allows the muffler cover to be easily or more preferably attached to the muffler body with a small number of parts. The purpose is to provide.

[0006]

A structure for mounting a muffler cover according to a first aspect of the present invention is provided with a cylindrical body and an end plate (upstream side or downstream side end) of the cylindrical body (generally perpendicular to the axis). The structure for attaching the muffler cover to the cylindrical muffler body including the plate and the end plate).
It is configured as in b). a) Bend the outer peripheral edge of the end plate outward (that is, to the upstream side or the downstream side of the muffler body so as to project from either end) so as to contact the inner peripheral surface of the cylinder of the muffler body, and then bend it. Form a protrusion on the part. Such bent portions and protrusions may be formed by providing an outer peripheral edge portion (bent portion) 12a and a protrusion 13 in the end plate 12 as shown in FIG. 1, for example. b) The protrusion shall be inserted into the insertion opening formed along the inner surface of the muffler cover.

Such an attachment structure has the following operational features. -It is not necessary to assemble the parts used only for installing the muffler cover to the muffler body. That is, FIG.
A muffler body necessary for attaching the muffler cover can be obtained by simply assembling the end plate, which is the original basic component, to the muffler body without attaching special parts such as the plates 63 and 64 of (b) to the muffler body. The side part (projection above) will be provided. The protrusion used to attach the muffler cover is
This is because the end plate is formed by bending as described above.

It is also easy to form an insertion opening for a protrusion along the inner surface of the muffler cover without using many parts, for example, by using a contact plate 21 as shown in FIG. 1 (see claim 2). You can do it. Therefore, the formation of the muffler body side and the muffler cover side parts (protrusions and insertion openings) necessary for attaching the muffler cover can be easily performed as a whole at low cost.

The position (height) of the muffler cover with respect to the outer peripheral surface of the cylindrical body of the muffler body can be made constant without variation. The height of the muffler cover with respect to the outer peripheral surface of the cylinder is determined by where in the radial direction of the cylinder the protrusion is provided.However, according to this mounting structure, the protrusion is bent so as to be in contact with the peripheral surface of the cylinder. This is because it is formed at the end of the curved portion and always exists at a position in contact with the peripheral surface of the cylinder, and there is no room for attachment error unless the thickness and shape of the cylinder vary. Therefore, the outer peripheral surface of the cylindrical body of the muffler body and the muffler cover are
It will be continuous without being scattered individually or through a fixed gap or the like.

The muffler cover mounting structure according to a second aspect of the invention is particularly formed by fixing the contact plate so that the insertion port has a clearance between the inner surface of the muffler cover and the protrusion. , A damper (a cushioning member made of an elastic member such as rubber or resin) between the insertion port and the protrusion
It is characterized by wearing. That is, the insertion port is shown in FIG.
A backing plate 21 as illustrated in FIG.
It is preferable that the damper 25 is formed by being fixed to the inner surface of the plate, and a damper 25 is sandwiched between the formed insertion port 22 and the protrusion 13 on the muffler body 10 side as shown in the figure.

According to this mounting structure, the insertion port can be formed by a simple method of fixing the contact plate to the inner surface of the muffler cover. That is, instead of forming the insertion opening by using the two plates 63 and 64 as in the example of FIG. 5B, the back plate that can be configured by bending only one plate is fixed to the muffler cover itself. Since it forms an insertion opening along the inner surface of the muffler cover,
It requires less cost and effort.

Since the protrusion is not directly inserted into the insertion port but a damper is mounted between the two, the precision required for manufacturing is low. Even if the dimensions and position (circumferential position, etc.) of the insertion port and the protrusion are not high, the protrusion can be smoothly inserted into the insertion port based on the elasticity of the damper, and there is rattling between them. Can be prevented.

In the muffler cover mounting structure according to a third aspect of the present invention, the above-mentioned projections are further provided at the upstream end of each of the two muffler bodies arranged close to each other, and the projections are formed as one (that is, common). It is characterized in that it is inserted into each of the insertion openings of the muffler body. 2 and 3, the muffler cover 50 is attached according to the attachment structure of this claim.

According to such a mounting structure, the mounting state of the muffler cover on the muffler body becomes stable. This is because, as long as the protrusions are provided on each of the two muffler bodies, a large space can be provided between the protrusions. If the distance between the protrusions is large, the attachment state of the muffler cover due to the coupling between the protrusions and the respective insertion openings is naturally stable.

In the muffler cover mounting structure according to the fourth aspect, when the connecting portion connecting the exhaust pipe and the plurality of muffler bodies is arranged, the connecting portion is covered and the exhaust pipe of the exhaust pipe is covered. It is characterized in that the muffler cover is attached so as to cover a part or all of the muffler body and a part or all of the muffler body.

This mounting structure can be implemented, for example, in a motorcycle by mounting the muffler cover 50 or 50 'as in the example of FIGS.

According to this structure, the exhaust pipe and the muffler body are covered with the muffler cover centering on the above-mentioned connecting portion, so that the appearance of the portion from the exhaust pipe to the muffler body (the portion that is easily visible to the human eye) is improved. Can be made. This is because the above-mentioned muffler cover covers the connection part, which tends to be complicated due to its complicated shape, with a smooth form, and at the same time, prevents the part, etc., which is discolored due to contact with exhaust gas, from being visible to human eyes. . In this way, the point of covering the discolored portion also has the meaning that it becomes possible to manufacture a connecting portion or the like having a complicated shape that tends to increase the manufacturing cost with a material that is easy to manufacture and is low in cost.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to FIGS. 1 to 3 by taking a case of a muffler of a motorcycle as an example.
Follow the instructions below. In addition, "right" described below
Unless otherwise indicated, "left", "front", and "rear" refer to the right, left, and left of the motorcycle body in the direction of travel.
Refers to the front and back.

First, FIG. 1 is a drawing showing an exhaust pipe 6 and a muffler body 10 following the exhaust pipe 6 in a motorcycle (not shown) and a muffler cover 20 covering them.
1 (a) and 1 (b) show the structure and procedure for attaching the muffler cover 20, and FIG. 1 (c) shows the details of the attachment (connection) portion in the attached state.

In the illustrated example, the downstream side (rear side) of the exhaust pipe 6
One muffler body 10 having a cylindrical shape is connected to the exhaust pipe 6 and the upstream end (front end) of the muffler body 10 is connected to the muffler body 10.
The muffler cover 20 is attached so as to cover the part up to. The muffler cover 20 is made of a metal plate so as to have a smooth curved surface with few irregularities, and has an outer surface plated with chrome or the like to give a glossy appearance. As shown in FIG. 1 (a), the muffler cover 20 is formed with a portion 20a having a substantially constant width and a portion 20b having a width that widens toward the rear, which are formed in series. 6 and the latter part 20b covers the vicinity of the front end of the muffler body 10.

As shown in FIGS. 1 (a) and 1 (b), the muffler body 10 is a cylindrical body 11 in which a sound absorbing material 11c made of glass wool is filled between an outer cylinder 11a and an inner cylinder 11b.
And end plates 12 and 15 which are integrated in front of and behind the tubular body 11 (upstream side and downstream side of the exhaust flow). A plurality of expansion chambers (not shown) are formed in the interior surrounded by the cylinder 11 and the end plates 12 and 15 so as to reduce the exhaust noise, following the exhaust pipe 6.
An exhaust outlet 14 is provided inside the end plate 15 at the rear end (downstream end). Exhaust pipe 6 and muffler body 1
Each of the cylinders 0 and end plates of No. 0 is made of a stainless steel plate. The bolt 16 in FIG. 1A is for attaching the muffler body 10 to a motorcycle body (not shown).

The front portion of the muffler cover 20 is mounted on the peripheral surface of the exhaust pipe 6 by using the metal band 23 shown in FIG. 1 (a). That is, FIG.
The fixing piece 51 shown for the muffler cover 50 of (b).
A fixing piece (not shown) similar to 53 is integrated with the inner surface of the muffler cover 20, and the band 23 is wound so as to tighten the exhaust tube 6 with the muffler cover 20.

However, regarding the rear part of the muffler cover 20 to be mounted near the front end of the muffler body 10,
The following structure is adopted. That is, a) First, the end plate 12 of the muffler body 10 is
As shown in (b), it is formed so as to have a U-shaped cross section open toward the outside (front side, that is, the upstream side of exhaust gas) at each portion on the circumference. This is formed by bending (deep drawing) a steel plate by press working. In such an end plate 12, the inner peripheral edge portion 12b is fitted on the outer peripheral surface of the exhaust pipe 6, and the outer peripheral edge portion 12a is inserted so as to be in contact with the inner peripheral surface of the tubular body 11 (inner cylinder 11b). 12a / 12
b is welded to the exhaust pipe 6 and the cylinder 11 all around.

B) A protrusion 13 is formed at the tip (front) of the outer peripheral edge portion 12a of the end plate 12. The protrusion 13 is shown in FIG.
As shown in the above, it is a tongue with a rounded tip and is formed on a flat plate before being processed as the end plate 12, and when it is pressed as described in a) above, it is flush with the outer peripheral edge 12a (extension). ) Make sure that it projects straight ahead. Three protrusions 13 are formed at equal intervals so that they are located on the left side of the muffler body 10.

C) On the other hand, for the muffler cover 20,
By fixing the backing plate 21 to the inner surface near the rear end,
The insertion port 22 is formed along the inner surface thereof. Patch plate 21
Is a corrugated / belt-shaped steel plate in which a portion in contact with the inner surface of the muffler cover 20 and a portion forming a gap apart from the inner surface by a few mm are alternately formed. By welding the former portion to the muffler cover 20, Stick to it. Three parts are formed to form a gap, and the number and the interval of the protrusions 13 provided in b) above are matched.

D) A rubber damper 25 fitted to each protrusion 13 is manufactured. The damper 25 can be tightly mounted on each protrusion 13 and can be inserted into the insertion opening 22 in a mounted state. It is a bag-shaped rubber having high heat resistance (such as silicone rubber or fluororubber). ).

E) A damper 25 is fitted to each protrusion 13 on the muffler body 10, and the protrusion 13 is inserted into the insertion opening 22 of the muffler cover 20 together with the damper 25 so that the rear portion of the muffler cover 20 is muffled. Body 10
Attach to the front end of. The front part of the muffler cover 20 may be mounted on the exhaust pipe 6 by utilizing the band 23 as described above after the rear part is thus mounted.

F) In the state where the muffler cover 20 is attached as in the above e), as shown in FIG. 1C, the rear end of the muffler cover 20 and the cylindrical body 11 of the muffler body 10 (cylindrical 11).
a) are connected to each other via a slight gap (about 1 mm in thickness). This means that the protrusion 13 is always provided in a position in contact with the inner peripheral surface of the cylindrical body 11 by the above a) and b), and the thickness of the damper 25 (particularly, it is sandwiched between the protrusion 13 and the muffler cover 20). Thickness of the cylinder)
By making it slightly thicker than the sum of the thicknesses of 11b, it can be realized easily and stably. The gap is provided between the rear end of the muffler cover 20 and the cylindrical body 11 of the muffler body 10 as described above so that the two do not come into contact with each other during operation and generate a so-called chattering noise. . In order to prevent chattering noise, the size and shape of each part may be appropriately changed so that the rear end of the muffler cover 20 is pressed against the surface of the cylindrical body 11.

2 and 3, the motorcycle X is shown.
The example in which the muffler cover 50 is attached to the two-type muffler 1 in FIG. 2A is a side view showing the entire motorcycle X, and FIG. 2B is a side view showing details of the muffler cover 50 and the like. 3A shows the details of the protrusions 33 and 43 on the muffler 1 and the insertion opening 52 on the muffler cover 50, and FIG. 3B shows the attachment (connection) with the muffler cover 50 attached. The details of the part are shown. Note that FIG. 3 (c)
In a manner slightly different from the case of the same (b) etc.
FIG. 6 is a detailed view showing a mounting state in the case of forming the.

As shown in FIG. 2A, the motorcycle X has
The engine 2 is mounted at a position below the fuel tank, and an exhaust pipe 3 and a manifold 4 and an exhaust pipe such as a joint pipe 5 are connected to an exhaust port 2a of the engine 2, and a muffler body including the muffler bodies 30 and 40 is provided at an end portion thereof. 1
Are connected. The muffler 1 has a cylindrical outer shape 2
The muffler body of the book, that is, the first muffler body 30 and the second muffler body 40 are connected in series.

The first muffler body 30 of the muffler 1 is
The joint pipe 5 and the connecting pipe 38 are connected to the front end (the inside of the end plate 32 in FIG. 3B), and the rear end is provided with an end plate 34 (without opening) (or with the opening closed). Figure 2
(B)) is closed. There is only one expansion chamber inside the muffler body 30, and the total amount of exhaust gas that has entered from the joint pipe 5 returns inside and travels into the connecting pipe 38, and the exhaust sound also reaches the rear end plate 34. It reflects on the wall surface and returns to the front. Therefore, inside the first muffler body 30, the traveling wave and the reflected wave of the exhaust sound are overlapped with each other, and the sound pressure is canceled out based on the phase difference between them. Moreover, since the distance from the front end to the rear end is long (about 300 mm or more, but it is changed according to the frequency range to be reduced), a sufficient phase difference can be obtained, so that the muffler body 30 is ,
Although it has a small diameter, it has the ability to effectively reduce exhaust noise centering on low frequency components.

On the other hand, in the second muffler body 40, the downstream end of the connecting pipe 38 is connected to the front end (end plate), and exhaust gas is passed through a plurality of expansion chambers and resonance chambers provided inside. It is a general type muffler body that is sent out from the exhaust outlet in the end plate 44 at the rear end. Exhaust noise can be reduced centering on middle and high frequency components by the action of each expansion chamber, resonance chamber, sound absorbing material, and the like. Since a substantially linear exhaust flow is made inside, this second muffler body 40
The exhaust pressure loss at is relatively small.

Each of the muffler bodies 30 and 40 is formed of a double inner and outer stainless steel cylinder, and a stainless steel end plate is also integrated in front of and behind a cylindrical body which is filled with a sound absorbing material (glass wool) therebetween. It is formed by this. For example, in the muffler body 30 shown in FIG. 3B, reference numeral 31 is a cylinder body in which the sound absorbing material 31c is filled between the cylinders 31a and 31b, and reference numeral 32 is integrated with the front end portion of the cylinder body 31. It is an end plate.

As shown in FIG. 2, the muffler cover 50 used for the motorcycle X is also made of a metal plate so as to have a smooth curved surface with less unevenness, and its outer surface is plated with chrome or the like to enhance its appearance. is there. A portion 50a having a substantially constant width is formed in the portion from the front to the middle, and a portion 50b having a width that widens rearward is formed in the rear portion to form a series, and the former portion 50a Covering the manifold 4 and joint pipe 5, the latter part 5
0b covers the vicinity of the front ends of the muffler bodies 30 and 40 (in particular, the portions where the joint pipe 5 and the connecting pipe 38 are connected vertically asymmetrically).

Also in this muffler cover 50, the front and middle portions are the metal bands 53 shown in FIG. 2 (b).
Is attached to the peripheral surface of the joint pipe 5. That is, the tips of the fixing pieces 51 and 53, which are partially fixed to the inside of the muffler cover 50, are attached to the band 53.
Tighten on the outer peripheral surface of the joint pipe 5 by.

The portion 50b of the muffler cover 50
In this example, the following structure is used as a means for fixing the vicinity of the rear end portion to the muffler bodies 30 and 40. a) As shown in FIG. 3B, as in the case of FIG. 1B, the end plate 32 of the muffler body 30 has a U-shape that is opened outward (forward) by bending (deep drawing). It shall have a cross section. The inner peripheral edge portion 32b of the end plate 32 is covered on the outer peripheral surface of the connecting pipe 38, and the outer peripheral edge portion 32 is covered.
A is fitted so as to be in contact with the inner peripheral surface of the cylindrical body 31 (cylinder 31a), and the entire circumference is welded. The same applies to the front end plate of the muffler body 40.

B) Only one protrusion 33 is formed at the tip (front) of the outer peripheral edge portion 32a of the end plate 32 and on the left side of the motorcycle X. As shown in FIG.
Has a round tongue-shaped tip, and is formed before the bending of the end plate 32 so that it projects on an extension of the same plane as the outer peripheral edge 32a. Similarly, on the front portion of the muffler body 40, a protrusion 43 is formed at one position on the end plate 42.

C) At the portion near the rear end of the muffler cover 50, the contact plate 51 is attached to the inner surface as shown in FIGS.
By fixing the, the insertion port 52 is formed along the inner surface. The backing plate 51 is a mountain-shaped or strip-shaped steel plate that has a space between both side portions in contact with the inner surface of the muffler cover 50 and is spaced apart from the inner surface by a few mm, and the former portion is welded to the muffler cover 50. Each protrusion 3 provided in b) above
The contact plates 51 are fixed at two positions so that the positions of the insertion openings 52 are aligned with the positions of 3 · 43.

D) A heat-resistant rubber / bag-shaped damper 55 is provided which can be tightly fitted to the protrusions 33 and 43 and can be inserted into the insertion opening 22 in that state.

E) After mounting the damper 55 on each of the protrusions 33 and 43, together with the damper 55, each of the protrusions 33 and 43.
The rear part of the muffler cover 50 is inserted into the muffler body 30, 40 so that the muffler cover 43 can be inserted into the respective insertion openings 52 of the muffler cover 50.
Attach to the front end of. The front part of the muffler cover 50 will be attached to the band 5 after the rear part is thus attached.
3 (FIG. 2 (b)) may be used to mount it on the exhaust pipe 6.

F) In the state where the muffler cover 50 is attached as in the above e), as shown in FIG. 3B, the rear end of the muffler cover 50 and the tubular body 31 (cylindrical 31) of the muffler body 30.
and (a) are connected via a slight gap (about 1 mm in thickness). As described above, the protrusion 33 is always provided in a position in contact with the inner peripheral surface of the cylindrical body 31 (cylinder 31a), and the outer radius of the end plate 32 and the thickness of the damper 55 (particularly the protrusion 33 and the muffler cover). The thickness of the portion sandwiched between 50 and 50 can be realized by making the thickness of the cover 50 equal to the outer radius of the cylinder 31a. The gap is provided as described above in order to prevent a so-called chattering noise from being generated during the operation due to the contact between the two, but from the same viewpoint, the rear end of the muffler cover 50 is pressed onto the surface of the cylindrical body 31. You can do it.

G) In order to make the rear end of the muffler cover 50 and the cylindrical body 31 (cylinder 31a) of the muffler body 30 densely continuous in a manner different from the above f), the protrusions 33 'and the like are shown in FIG. 3 (c).
It may also be formed according to. That is, the protrusion 33 ′ formed at the tip of the outer peripheral edge portion 32a of the end plate 32 is provided with a bent portion at the base portion so that the thickness of the damper 55 is larger than that of the outer peripheral edge portion 32a (the protrusion 33 ′ and the muffler cover 50). Extend it to the inner position by a dimension close to the thickness of the part between the two). Then, the outer peripheral edge portion 32a of the end plate 32
Of the muffler cover 50 and the cylindrical body 3 on the outer surface of the
This is because the tip end of 1 (cylinder 31a) is in a state of being substantially butted on the same plane as shown in the figure. In addition,
It is preferable that the weld burn of the cylinder 31a and the end plate 32 be removed by buffing or the like.

FIG. 4 shows the attachment of the muffler cover 50 ′ to the motorcycle X ′ having a muffler 1 ′ different from the muffler 1 of FIGS. The muffler 1 ′ comprises two muffler bodies 30 ′ and 40 ′ each having exhaust outlets 44 and 34, which are connected in parallel to the branch pipe type connection portion 7. The connecting portion 7 has a shape in which one upstream side pipe is branched into two on the downstream side, the upstream side is connected to the joint pipe (exhaust pipe) 5, and each of the two downstream sides is a muffler body. It is connected to the exhaust inlet.

Also in such a motorcycle X ', as shown in FIG. 4, the muffler body 30'.
A muffler cover 50 'can be attached so as to cover the front part of 0', the joint pipe 5, and the like. The muffler cover 50 ′ has the same structure as the muffler cover 50 of FIGS. 2 and 3, and has a beautiful appearance in which the two parts 50 a and 50 b are smoothly integrated. Regarding the attachment of the muffler cover 50 ', the front portion is attached to the peripheral surface of the joint pipe 5 by using the band as shown in the figure, and the rear portion is attached to the muffler body as in the case of FIGS. Three
A protrusion (not shown) formed at the front end of 0'40 '
It is also preferable that the muffler cover 50 'is inserted into an insertion opening (not shown) similarly formed on the inner surface.

Although two examples of implementing the invention have been introduced above, the claimed invention is not limited thereto. Because the mounting structure of the invention is, for example, 1) not only a motorcycle but also an ATV (four-wheel buggy).
The muffler cover mounting structure for mufflers connected to engines such as vehicles, ships, generators, various working machines, general-purpose machines, etc. can also exert an advantageous effect, 2) Also, the downstream end of the muffler body A projection (extending toward the downstream side, that is, the outside of the muffler body) is formed on the end plate provided at the portion (not the upstream end portion), and by utilizing this, the muffler body has an insertion opening on the inner surface. It is also possible to attach a muffler cover that can cover the whole-because.

[0046]

The muffler cover mounting structure described in claim 1 has the following effects. That is: -The muffler body does not need to be separately assembled with a part used only for attaching the muffler cover. -Each part required for mounting the muffler cover on the muffler body side and the muffler cover side can be easily formed at low cost as a whole. The position (height) of the outer surface of the muffler cover with respect to the outer peripheral surface of the cylindrical body of the muffler body can be made uniform without variation.

According to the muffler cover mounting structure described in claim 2, the following effects can be further obtained. -The insertion port can be formed by a simple means of fixing the backing plate, which can be configured by bending one plate, to the muffler cover, and the required cost and labor can be reduced. -Since a damper is installed between the insertion port and the protrusion, the precision required for manufacturing is low.

According to the muffler cover mounting structure of the third aspect: The mounting state of the muffler cover to the muffler body becomes stable.

With the mounting structure according to claim 4, it is possible to improve the appearance of the portion from the exhaust pipe to the muffler body that is easily visible to the human eye. It is also possible to make the connecting portion and the like inexpensive and easy to make.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the invention.
(A) and (b) show the structure and procedure for attaching the muffler cover 20 to the muffler body 10, etc., and (c) shows the cross-sectional details of the attachment (connection) part in the attached state.

FIG. 2 is also a diagram showing an embodiment of the invention, FIG. 2 (a) is a side view showing the entire motorcycle X, and FIG. 2 (b).
FIG. 6 is a side view showing details of the muffler cover 50 and the like.

3 is a diagram related to the example of FIG. 2, in which FIG. 3 (a) is a detailed view showing the protrusions 33 and 43 on the muffler 1 and the insertion port 52 on the muffler cover 50, and FIG. 3 (b) is a muffler. Cover 50
FIG. 3 is a detailed view showing a mounting (connecting) portion in a state where is attached. Further, FIG. 3C is a detailed view showing a mounting state when the protrusion 33 ′ is formed in a mode different from that of the case of FIG.

FIG. 4 is a side view of an essential part showing the attachment of the muffler cover 50 ′ to the motorcycle X ′.

FIG. 5 is a drawing showing a conventional structure and procedure for mounting a muffler cover.

[Explanation of symbols]

10.30.40.30'.40 'Muffler body 11.31.41 cylinder 12, 32, 42 End plate 12a / 32a / 42a outer peripheral edge 13.33.33'.43 protrusion 20, 50, 50 'muffler cover 21.51 Reliable plate 22/52 insertion slot 25.55 damper X motorcycle

Continued front page    F term (reference) 3G004 AA02 BA08 CA13 DA15 DA21                       EA03 FA07 GA07

Claims (4)

[Claims] 1. A mounting structure for mounting a muffler cover on a cylindrical muffler body including a tubular body and an end plate at an end thereof, wherein an outer peripheral edge portion of the end plate is a circumferential surface of the muffler body in the cylinder. A structure for mounting a muffler cover, which is bent outward so as to come into contact, and a projection formed on the bent portion is inserted into an insertion opening formed along an inner surface of the muffler cover. 2. The insertion opening is formed by fixing a backing plate with a gap for inserting the projection between the insertion opening and the inner surface of the muffler cover, and between the insertion opening and the projection. The muffler cover mounting structure according to claim 1, wherein a damper is mounted on the muffler cover. 3. The two muffler bodies arranged close to each other are provided with the above-mentioned projections at their upstream ends, and these projections are respectively inserted into the insertion ports of one muffler body. A structure for mounting a muffler cover according to claim 1 or 2. 4. An exhaust pipe and a plurality of muffler bodies are provided with a connecting portion for connecting the exhaust pipe and the plurality of muffler bodies, and the connecting portions are covered with part or all of the exhaust pipe and part or all of the muffler body. A muffler cover mounting structure, characterized in that the muffler cover is mounted so as to cover also the.