JP3094632U - Exhaust system for motorcycle - Google Patents

Abstract

(57) [Problem] To provide an exhaust device having a novel structure in which a mounting angle of a silencer with respect to a vehicle body and the like can be easily set with a large degree of freedom. SOLUTION: In an exhaust system 10 including an exhaust pipe 12 and a muffler 14 mounted on a motorcycle 16 having a power unit 28, the exhaust pipe 12 and the muffler 14 are separately formed, respectively. The exhaust pipe 12 and the muffler 14 were connected via a detachable connecting pipe 36. In addition, as the connecting pipe 36, one having a plurality of types of bending or bending angles is available.
A pair of exhaust pipes 12 and a muffler 14 are provided in combination as a set.

Description

[Detailed description of the device]

[0001]

【Technical field】

  The present invention is mounted on a two-wheeled vehicle or a motorized bicycle, and is discharged from an internal combustion engine. Related to exhaust systems for motorcycles that muffle the exhaust gas that is emitted into the atmosphere. is there.

[0002]

[Background technology]

  Generally, an internal combustion engine cools and extinguishes exhaust gas discharged from its exhaust port. Equipped with an exhaust system to make noise and purify it if necessary and release it to the atmosphere. . In particular, two-wheeled vehicles including scooter type and side vehicle type and motorized bicycles (below Below, they are collectively called "motorcycles". ) Is the exhaust port of the internal combustion engine It has a structure with a silencer at the tip of the exhaust pipe connected to the The sound device is relatively large and occupies a large area in side view. It has a large share in design, and attention may be paid to its shape and color. Many. In addition, the exhaust system of a motorcycle has a relatively high degree of originality by the owner. A motorcycle manufacturer because it is a part that can be easily and effectively claimed. Demand for not only genuine products but also in the aftermarket. Exhaust device with various original designs by It is provided to the market for each model of Tobay.

[0003]   By the way, when it comes to the design of motorcycle exhaust systems, Due to the large size of the silencer, not only the shape of the silencer itself The tilt angle and position of the silencer with respect to the body frame also have a significant effect. Becomes In addition, since the silencer is large, it depends on the tilt angle and position when it is installed. May interfere with the installation of optional items such as the rear box and the riding of the rear seats in tandem. There is a risk of damage.

[0004]   However, in the conventional exhaust system for motorcycles, the exhaust pipe and the silencer are integrally formed. In addition to the above, there are also exhaust pipes and silencers that are formed separately and fixed afterwards. However, the shape of the entire exhaust system including the exhaust pipe and silencer is fixed. Therefore, the user can set the tilt angle of the silencer according to personal preference. In principle, it was not possible to do so, and there was almost no degree of design freedom for each user. Of.

[0005]   In addition, the conventional exhaust system for motorcycles is a complete exhaust system including exhaust pipe and silencer. Since the shape of the body is fixed, the stores, etc. may differ depending on the user. Depending on the taste on the THine, whether or not options are installed, etc. In order to be able to select the tilt angle and position of the silencer when wearing the It is necessary to prepare multiple types of storage units, so regarding storage space for stock, etc. There was a problem that the burden on retailers was heavy.

[0006]   In view of such a problem, Patent Document 1 discloses that a silencer is connected to an exhaust pipe. The bending tube is used as the part, and the bending tube is connected to the exhaust pipe at the joint. By rotating it around the axis, you can choose the connection angle of the silencer to the exhaust pipe. An exhaust system for a motorcycle has been proposed that can be changed and set. But Naga After all, in the exhaust system with such a structure, the installation angle when installing the silencer is upward. It can only be set selectively between the downward direction and the downward direction, and especially If you set the shape of the bending tube so that the rear end of the silencer rises significantly upward, The rear end of the silencer hangs downward when the bent pipe body is turned upside down. Since the mounting angle is unreasonable and not practical, the set angle is practical. There was a problem that the degree was limited to a relatively narrow range.

[0007]   Further, in Patent Document 2, a tapered spacer is provided at a connecting portion of the silencer to the exhaust pipe. The interposition of the silencer makes it possible to change the connection angle of the silencer to the exhaust pipe. An exhaust system for a motorcycle has been proposed. However, tapered spacers Is a large-diameter component that is close to a silencer, so the exhaust system design There is a risk that it will be significantly damaged. Also, it can be erased by installing a tapered spacer. Because the insertion angle of the exhaust pipe to the sounder changes, the interference of the exhaust pipe with the silencer There is a risk that it is difficult to set a large connection angle at the connection part between the exhaust pipe and the silencer. In addition to the problem of being uncomfortable, even if you can set a large connection angle Also changes the discharge direction of the exhaust gas discharged from the exhaust pipe into the muffler There was a risk that the exhaust efficiency and noise reduction efficiency inside the vessel would be adversely affected.

[0008]

[Patent Document 1]             JP, 7-166859, A

[Patent Document 2]             JP-A-6-336920

[0009]

[Solution]

  Here, the present invention has been made against the background of the above circumstances. However, the problem to be solved is that the installation work of the exhaust pipe and the silencer is advantageously realized. And the setting angle of the exhaust pipe of the muffler or the mounting angle to the vehicle body can be easily changed. It is an object of the present invention to provide a motorcycle exhaust device having a novel structure that can be achieved.

[0010]

[Solution]

  Hereinafter, the mode of the present invention made in order to solve such a subject is described. Na Note that the components adopted in each of the aspects described below may be combined in any desired manner. Can be used together. The aspects and technical features of the present invention are described below. Without being limited to those described in the entire specification and drawings, or those It is recognized based on the idea of a device that a person skilled in the art can understand from the description of It should be understood that there is.

[0011] (Aspect 1 of the present invention)   A first aspect of the present invention is that a front end portion of an exhaust pipe connected to an exhaust port of an internal combustion engine is installed. In a motorcycle exhaust system equipped with a sounder, the silencer is independent of the exhaust pipe. If possible, the silencer is detachably connected to the exhaust pipe, and the detachable connection pipe is formed separately. The silencer is used as such a connecting pipe while being connected through the body. Preliminarily combine a plurality of types to be connected to the exhaust pipe at mutually different connection angles Select one of the multiple types of connection pipes and install it. By doing so, the connection angle of the muffler to the exhaust pipe can be selectively set. It is in the exhaust system for motorcycles.

[0012]   In the exhaust device having the structure according to the present embodiment as described above, By selecting and using any one of the prepared multiple types of connecting pipes, The connection angle of the sounder to the exhaust pipe , It is possible to arbitrarily select and set from a plurality of types. Therefore, the number of users A person or a store, etc. may choose a user's personalized design, or select an option selected for each user. Select an appropriate one from the multiple connection tubes according to whether or not optional products are installed. By doing so, the mounting angle of the silencer under the mounted condition can be selected and set appropriately. And can be done.

[0013]   There, connecting pipes of any angle are required, especially in such exhaust systems. If you prepare only the number of types you think, the inclination angle corresponding to each of these connecting pipes Since it can be set as a silencer, the tilt angle can be adjusted when the silencer is installed. Even if it can be set to several types, make the exhaust pipe and silencer themselves common Is possible. Therefore, individual users or retailers, etc. respond to user requests. , Even when setting or changing the tilt angle of the silencer appropriately, the user or retailer Does not need to have exhaust pipes and silencers for each tilt angle to be set. Spending and inventory can be minimized.

[0014]   Moreover, the connecting pipe body that determines the inclination angle of the silencer is neither the exhaust pipe nor the silencer. Exhaust efficiency and noise reduction performance of exhaust pipes and silencers because they are separate and independent parts Etc., and the connection pipe body can be used as an exhaust pipe. It is possible to make the pipes with substantially the same outer diameter, and therefore, when mounting the connecting pipe, The negative impact on the design of the exhaust system is not a problem.

[0015]   Further, in the exhaust device having the structure according to this aspect, the silencer is relatively large. Due to its large mass, vibrations when the motorcycle travels affect the exhaust system. When this happens, stress concentration is likely to occur at these connecting parts, but such connecting parts are exhaust pipes. Since it is composed of a connection pipe that can be attached to and removed from the muffler and Even if damage such as cracks occurs due to the inside, only the small and inexpensive connecting tube is replaced. By doing so, it becomes possible to respond.

[0016]   In addition, the specific shape and structure of the exhaust pipe and the silencer used in this embodiment are particularly It is not limited, and any conventionally known one can be adopted, for example, As the exhaust pipe, the parts from the mounting part of the internal combustion engine to the mounting part of the connecting pipe are integrated. In addition to the tubular structure, the front exhaust is equipped with a mounting part for internal combustion engines. Separate shape of pipe and middle exhaust pipe with attachment part to connection pipe body For example, a longitudinally divided tubular structure that is formed can be adopted. Also a silencer In addition, the expansion type muffler, the resonance type muffler, the muffler using sound absorbing material, etc. are all used. Can be

[0017] (Aspect 2 of the present invention)   A second aspect of the present invention is the exhaust system for a motorcycle according to the first aspect, wherein: The connecting pipe is fitted to the exhaust pipe and the silencer at both ends in the pipe axial direction. It is characterized in that it is designed to be worn and fixed. A structure according to this embodiment In the built-in exhaust system, the exhaust pipe and silencer can be connected more easily through the connecting pipe. It can be attached and detached, and the exhaust device including the exhaust pipe, silencer, and connecting pipe body. It is also easier to manufacture the device.

[0018] (Aspect 3 of the present invention)   Aspect 3 of the present invention is the exhaust system for a motorcycle according to Aspect 1 or 2 above, As the connection pipe body, one in which the connection angles of the exhaust pipe and the silencer are different from each other The feature is that two or three kinds are combined. In this embodiment, it is practical and The tilt angle of the muffler can be changed and set within a range that is not wasteful.

[0019] (Aspect 4 of the present invention)   Aspect 4 of the present invention is the exhaust system for a motorcycle according to any one of Aspects 1 to 3. In addition, the exhaust pipe and the silencer are provided with hooking portions, respectively, and Preventing the fall-off by straddling the connecting pipe body and straddling between the hooking portion of the exhaust pipe and the hooking portion of the silencer. The exhaust pipe and the muffler are detachably attached to the exhaust pipe by attaching a stopper. The feature is that they are directly connected. In this aspect, the connecting pipe is Connection strength and reliability at the connection part of the exhaust pipe and silencer via the The muffler is disengaged from the exhaust pipe due to some accident while driving. Even if it does, the silencer can be prevented from falling off and safety can be maintained. It should be noted that As a fall-out preventing means in such a case, for example, a fixed type connection using bolts or wires is used. A connection structure can also be adopted, but particularly preferably a connection structure using a tension coil spring Can be adopted.

[0020] (Aspect 5 of the present invention)   A fifth aspect of the present invention is the exhaust system for a motorcycle according to any one of the first to fourth aspects. At the connection portion of the connection pipe body to the exhaust pipe and / or the silencer. It is characterized in that a stop member is attached. As the sealing member, for example, a known A gasket, packing, etc. can be suitably adopted.

[0021] (Aspect 6 of the present invention)   A sixth aspect of the present invention is the exhaust system for a motorcycle according to any one of the first to fifth aspects. The internal combustion engine to which the exhaust pipe is connected is driven by the swing arm of the rear wheel. It is characterized by being mounted on a supported scooter type motorcycle. Nature The characteristics of scooter type motorcycles include internal combustion engine and exhaust system. The entire body including the Therefore, a large excitation force is exerted especially on the exhaust system, and the exhaust pipe and silencer are installed. A greater stress concentration is caused at the connecting part to be connected, and such connecting Although there is a concern that defects such as cracks will occur in the parts, for motorcycles according to this aspect In the exhaust system, only the connecting part is formed separately from the connecting tube, so Durability by making the connecting pipe thicker than the exhaust pipe, etc. It is easy to cover the connection pipe, and if there is a crack in the connecting pipe, Even if it fits, it is easy by replacing only the connecting pipe that is supplied as a small and inexpensive component. Can be dealt with.

[0022] (Aspect 7 of the present invention)   A seventh aspect of the present invention is the exhaust system for a motorcycle according to any one of the first to sixth aspects. In the above, the intermediate portion in the longitudinal direction of the connecting pipe body has a flexible structure, To do. In this aspect, the inclination angle of the silencer is changed based on the flexibility of the connecting pipe body. It is possible to make finer settings, and the alignment of the silencer with other members is also finer. It becomes possible to set it. For the flexible structure, consider heat resistance and pressure resistance. Considering this, for example, a metal tube body having a bellows structure is preferably adopted.

[0023]

[Embodiment of device]

  Embodiments of the present invention will be described below in order to further clarify the present invention. A detailed description will be given with reference to the drawings.

[0024]   First, FIG. 1 is a schematic exploded view of an exhaust device 10 according to an embodiment of the present invention. It is shown schematically. This exhaust device 10 is an exhaust pipe as an exhaust pipe. 12 and a muffler 14 as a silencer, which is shown in FIGS. It is adapted to be mounted on the scooter 16 as a motorcycle.

[0025]   The body of the scooter 16 is well known in the art, and its schematic structure is simple. To explain, the front of the seat portion 18 is low and widely scooped out, and the footsteps 20 are provided to the left and right. Is mounted on the body frame (not shown) so that it can be steered. The front wheel 22 having a small diameter is attached to the front suspension. Also, the body frame A swing arm 24 is attached to the rear part of the boom so as to be swingable around one axis. A small-diameter rear wheel 26 is attached to the rear end portion of the swing arm 24. Further The engine as an internal combustion engine is a power unit 28 including a transmission, and The power unit 28 is fixedly mounted to the mounting arm 24. Power is transmitted to the rear wheel 26 via a V-belt or the like.

[0026]   Exhaust device constituting the exhaust device 10 mounted on such a scooter 16 The ip 12 extends with a substantially constant hollow circular cross section as a whole, and The straight pipe portion 30 and the curved pipe portion 32 having a substantially arcuate curved shape are integrally provided. Also, A flange portion 34 is integrally formed at the opening of the curved pipe portion 32. The gear-shaped portion 34 is fixed to the power unit 28 of the scooter 16 with bolts or the like. As a result, the open end of the curved pipe portion 32 contacts the exhaust port (not shown) of the engine. It will be continued. In addition, the opening of the exhaust pipe 12 on the straight pipe portion 30 side The mouth end has a large diameter, and connects a connection pipe 36 as a connection pipe body described later. A fixing cylinder portion 38 for fixing is integrally formed (see FIG. 4).

[0027]   Further, the muffler 14 includes a housing 40 having a large diameter and a substantially cylindrical shape. At one axial end of the housing 40, an exhaust gas introduction port 42 is projected to the outside. It is open. On the other hand, at the other end of the housing 40 in the axial direction, the exhaust gas The discharge port 44 projects outward and is opened. In addition, the exhaust gas inlet 42 The opening end has a large diameter and is used for connecting and fixing a connection pipe 36 described later. The fixing cylinder portion 46 is integrally formed (see FIG. 4).

[0028]   Then, the muffler 14 collects the exhaust gas introduced from the exhaust gas inlet 42. , After the sound is silenced inside the housing 40, it is discharged to the outside from the exhaust gas discharge port 44. It is supposed to be released. Although not explicitly shown in the drawing, the housing 4 Inside of 0, various internal pipes and partition walls for realizing resonance type silencing Is provided.

[0029]   In addition, the exhaust pipe 12 and the muffler 14 as described above have the connection pipe 36. It is connected through. The connecting pipe 36 is used for the exhaust pipe 12 and the muff. Of a cylindrical shape that extends with substantially the same inner and outer diameter dimensions as the exhaust gas inlet 42 of the la 14 The tube is made of a metal material such as stainless steel or titanium. Especially this embodiment In the state, three first to third connection pipes 36a, 36 having different shapes are used. b, 36c are prepared in advance, and their first, second and third connecting pipes are provided. 36a, 36b and 36c are each one exhaust pipe 12 and muffler 14. It is offered to the market as a set in combination with. And these three Select one connection pipe 36 from the connection pipes 36a, 36b, 36c, The exhaust pipe 12 and the muffler 14 are connected by the connecting pipe 36 Growling.

Specifically, the first connection pipe 36a has a substantially straight cylindrical shape. The second connection pipe 36b has a curved portion 48 at the intermediate portion in the axial direction. Furthermore, the third connection pipe 36c has a curved portion 50 in the axially intermediate portion, and in particular, the degree of bending of the curved portion 50 is larger than that of the curved portion 48 of the second connection pipe 36b. It is set. As a result, the connection angle between the exhaust pipe 12 and the muffler 14 in FIG. 4, that is, the central axis: l ₁ of the fixing tubular portion 38 integrally formed with the straight pipe portion 30 and the exhaust gas introduction port 42 integrally fixed. The intersection angle α of the central axis: l ₂ of the tubular portion 46 can be changed by replacing the second connection pipe 36b.

[0031]   In the present embodiment, these three first, second and third connection pipes 36 are a, 36b, 36c, for example, select the first connection pipe 36a, and One end of the pipe 36a in the axial direction is attached to and detached from the fixing tubular portion 38 of the exhaust pipe 12. It is press-fitted and fixed as much as possible, and the other end in the axial direction is introduced into the muffler 14. The exhaust pas- sage is detachably press-fitted into the fixing tubular portion 46 of the mouth 42. The ip 12 and muffler 14 are connected. As a result, the power unit 28 Exhaust gas generated by gin is connected from exhaust port through exhaust pipe 12. After being guided from the pipe 36 to the muffler 14 and silenced, the exhaust gas discharge port 44 Will be released from the outside.

[0032]   Further, in the present embodiment, the above-mentioned first, second and third connection pipes 36a, 3 6b and 36c, a different one, for example, the second connection pipe 36b is selected, and As shown in the enlarged view of FIG. By connecting the waste pipe 12 and the muffler 14, as shown in FIG. The muffler 14 is attached diagonally upward with respect to the front-rear direction of the vehicle body at a predetermined attachment angle. It has become so.

[0033]   Further, it is different from the above-mentioned first, second and third connection pipes 36a, 36b, 36c. For example, selecting the third connection pipe 36c, the first connection pipe 36a The exhaust pipe 12 and the muffler 14 are connected in the same manner as the second connection pipe 36b. As a result, as shown in FIG. 3, the muffler 14 moves in the front-back direction of the vehicle body. On the other hand, the second connection pipe 36 is installed diagonally upward at a predetermined mounting angle. Compared to the scooter 16 with the b mounted, the mounting angle of the muffler 14 is set to be more obliquely upward. It is set to rise.

[0034]   In addition, the housing 40 of the muffler 14 is attached to the housing 40 by being externally attached and tightened in a strip shape. The attached bracket 52 is fixed, and the mounting bracket 52 is attached via the stay 54. To the support bracket 56 fixed to the power unit 28 of the scooter 16. The muffler 14 is fixed by the power unit 28 so that It is fixedly supported by the wing arm 24. In this embodiment, A large number of bolt fixing holes are provided through the holding bracket 56, and any bolt fixing holes can be provided. The stay 54 and the mounting bracket 52 are fixed to the ing. Alternatively, the stay 54 may have an appropriate shape depending on the inclination angle of the muffler 14. Alternatively, the length may be changed to a corresponding one.

[0035]   In the exhaust device 10 having such a structure, the exhaust pipe 12 and Since the muffler 14 is detachably connected via the connection pipe 36, It becomes possible to separately manufacture the soust pipe 12 and the muffler 14, The workability and handleability can be advantageously improved.

[0036]   Therefore, in the present embodiment, a plurality of connecting pipes 36 having different shapes are It is provided as a set in combination with a pair of exhaust pipe 12 and muffler 14. Therefore, among the three types of connection pipes 36a, 36b, 36c prepared in advance, Any one can be selected and adopted appropriately. Therefore, user individual , Or a store or the like selects an arbitrary connection pipe 36 according to a user's request. Assembled into one type of exhaust pipe 12 and muffler 14. However, the mounting angle of the muffler 14 can be set by arbitrarily selecting from a plurality of angles. After that, you can change and set it if necessary, and In addition to being able to easily respond to requests, the storage space for stock is small It can be done.

[0037]   Further, particularly in the present embodiment, such an exhaust device 10 is adopted in the scooter 16. As a result, the power unit is rotated along with the rotational displacement of the swing arm 24 of the scooter 16. The exhaust pie in which the knit 28 is swung and supported by the power unit 28 Local stress is concentrated on the connection between the pump 12 and muffler 14, causing damage such as cracks. Even in the case of occurrence of the above, the connecting portion is constituted by the connecting pipe 36. By doing so, it is possible to deal with it easily by simply replacing the connection pipe 36. Further, only the connecting pipe 36 forming the relevant portion (stress concentrated portion) is strengthened. As a result, the durability can be efficiently improved.

[0038]   Although one embodiment of the present invention has been described in detail above, this is merely an example. Therefore, the present invention is limited by the specific description in the embodiment. It is not interpreted in a conventional way.

[0039]   For example, in the above-described embodiment, the connection pipe 36 is the solid pipe of the exhaust pipe 12. Inside which is press-fitted and fixed to the fixed cylinder portion 38 and the fixing cylinder portion 46 of the muffler 14. Although it was a fitting structure, as shown in FIG. By providing the expanded cylindrical portion 58 for fixing, the fixed cylindrical portions 58, 58 are respectively provided with Exhaust in the tip portion of the straight pipe portion 30 in the exhaust pipe 12 and in the muffler 14. An external fitting structure in which the tip portion of the gas introduction port 42 is detachably press-fitted and fixed may be used. .

[0040]   In addition, in FIG. 5 and FIG. 6 and subsequent figures, the structure is similar to that of the above embodiment. The same reference numerals as those in the above-mentioned embodiment will be given to the members and parts that have Detailed description thereof will be omitted.

[0041]   Further, in the above embodiment, as shown in FIG. The pipe 12 and the muffler 14 are provided with fixing hooks 60 as hooking portions, respectively. And the hook 6 for fixing the exhaust pipe 12 across the connecting pipe 36. 0 and the coil spring 6 as a fall-prevention means on the hook 60 for fixing the muffler 14. Between the exhaust pipe 12 and the muffler 14 by crossing over 2 It is also possible to exert a biasing force.

[0042]   In the above embodiment, the connection pipe 36 is made of hard metal such as stainless steel or titanium. Although it was formed of a metal material, it is not limited to this, and for example, as shown in FIG. As described above, the intermediate portion of the connecting pipe 36 in the longitudinal direction is formed as a flexible structure. A connection pipe 64 having a bellows structure may be used.

[0043]   In addition, the connecting pipe 36 is connected to the exhaust pipe 12 and the muffler 14. The connecting structure to be used is not limited to the illustrated structure, and may be, for example, the connecting pipe 36. A flange-shaped portion is provided at each opening end of the exhaust pipe 12, the muffler 14, Overlap each flange-shaped part and fix it detachably with bolts etc. It is also possible. Furthermore, for example, as a sealing member between the joint surfaces of both flange-shaped parts Place the gasket and packing of the You can set it.

[0044]   In addition, the second connection pipe 36b and the third connection pipe 36 in the above embodiment. Although the curved portions 48 and 50 were provided in c, instead of these curved portions 48 and 50, Of course, it is also possible to provide a bent portion or the like.

[0045]   Although not listed one by one, the present invention has various modifications based on the knowledge of those skilled in the art. The present invention can be carried out in a mode in which changes, modifications, improvements, etc. are added, and Any such embodiments are within the scope of the invention without departing from the spirit of the invention. It goes without saying that it is rare.

[0046]

[Effect of device]

  As is apparent from the above description, in the exhaust device having the structure according to the present invention, Adopts a structure in which the exhaust pipe and silencer are connected via a connection pipe body that can be attached and detached. Along with a pair of exhaust pipes and silencers, various types of connecting pipes with different shapes Since it is designed to be provided in combination, among the multiple connection pipes provided in advance By selecting and adopting an appropriate one, the installation angle of the silencer with respect to the vehicle body Can be easily and freely set by the user or the retailer depending on the taste of the user. Can be set appropriately.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing an assembled and disassembled form of an exhaust device according to an embodiment of the present invention.

FIG. 2 is a side model view showing a scooter in which an exhaust device is configured by selecting an arbitrary connection pipe from the three connection pipes in FIG. 1 and the exhaust device is mounted.

FIG. 3 is a side model view showing a scooter in which an exhaust device is configured by selecting a connection pipe of a mode different from that of FIG. 2 from the three connection pipes in FIG. 1 and the exhaust device is mounted.

FIG. 4 is an explanatory longitudinal sectional view showing an enlarged main part of the exhaust device in FIG.

FIG. 5 is an explanatory longitudinal cross-sectional view showing an enlarged main part of an exhaust device as another specific example of the present invention.

FIG. 6 is an explanatory vertical cross-sectional view showing an enlarged main part of an exhaust device as another specific example of the present invention.

FIG. 7 is a vertical cross-sectional explanatory view showing an enlarged main part of an exhaust device as yet another specific example of the present invention.

[Explanation of symbols]

10 exhaust system 12 Exhaust pipe 14 Muffler 16 scooter 28 Power Unit 36a First connection pipe 36b Second connection pipe 36c Third connection pipe

Claims (7)

[Scope of utility model registration request] 1. An exhaust system for a motorcycle, wherein a silencer is provided at a tip portion of an exhaust pipe connected to an exhaust port of an internal combustion engine, wherein the silencer is formed independently of the exhaust pipe, and the silencer is exhausted from the exhaust pipe. The pipe is connected to the exhaust pipe through a detachable connecting pipe, and the silencer is connected to the exhaust pipe at different connecting angles as the connecting pipe. A combination of multiple types in advance,
A motorcycle characterized in that a connection angle of the silencer with respect to the exhaust pipe can be selectively set by selecting and mounting one arbitrary connection pipe out of the plurality of types of connection pipes. Exhaust system. 2. The exhaust system for a motorcycle according to claim 1, wherein the connecting pipe body is fitted and fixed to the exhaust pipe and the silencer at both end portions in the pipe axial direction. 3. The exhaust system for a motorcycle according to claim 1, wherein as the connecting pipe body, two or three kinds of connecting pipes having different connection angles of the exhaust pipe and the silencer are combined with each other. 4. The exhaust pipe and the silencer, respectively,
A hooking portion is provided, and a fall prevention means is detachably attached across the connecting pipe body and between the hooking portion of the exhaust pipe and the hooking portion of the silencer. The exhaust system for a motorcycle according to any one of claims 1 to 3, wherein the exhaust pipe and the silencer are directly connected to each other by a drop-out preventing means. 5. The exhaust system for a motorcycle according to claim 1, wherein a sealing member is attached to a connection portion of the connection pipe body with respect to the exhaust pipe and / or the silencer. 6. The exhaust system for a motorcycle according to claim 1, wherein the internal combustion engine to which the exhaust pipe is connected is mounted on a scooter type motorcycle supported by a swing arm of a rear wheel. 7. The exhaust system for a motorcycle according to claim 1, wherein an intermediate portion in the longitudinal direction of the connecting pipe body has a flexible structure.