Exhaust device

Abstract

To provide an exhaust device capable of easily removing spatter from a muffler body.SOLUTION: An exhaust device guides exhaust gas discharged from an engine to outside. The exhaust device includes: a cylindrical muffler body (52) in which a muffler chamber is formed; a baffle plate (61) that partitions the muffler chamber in the forward / backward direction; and an exhaust pipe (41) mounted to a front part of the muffler body. A communication passage (63) for connecting front and rear sides of the muffler chamber is formed on the baffle plate. An opening (46) for connecting the front side of the muffler chamber and the inner side of the exhaust pipe is formed on the exhaust pipe. Forward inclination of the muffler body forms a discharge route of a spatter (73) passing through the communication passage and the opening.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to an exhaust system. [Background technology]

[0002] Exhaust systems for saddle-ride vehicles are provided with mufflers that reduce exhaust noise downstream of the exhaust pipe. Mufflers for exhaust systems are manufactured by welding together multiple components, such as a muffler body, front cap, end cap, baffle plate, and various pipes (see, for example, Patent Document 1). The muffler described in Patent Document 1 has a front cap welded to the front edge of a cylindrical muffler body, and end caps welded to the rear edge of the muffler body. A baffle plate within the muffler body has multiple openings, and various pipes inserted into each opening are welded to the baffle plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6069232 Summary of the Invention [Problem to be solved by the invention]

[0004] However, spatter can be generated during muffler welding, which can cause abnormal noise during operation, so it is necessary to remove the spatter from inside the muffler body. In this case, a magnetic tool is inserted into the muffler body and the spatter is attached to the tip of the tool and removed, or the muffler is shaken to shake the spatter out through the opening in the muffler body. However, the internal structure of the muffler has become more complex in order to improve noise reduction performance, making it difficult to insert a magnetic tool deep into the muffler body and to shake the spatter out of the muffler body.

[0005] The present invention has been made in view of the above points, and has as its object to provide an exhaust device that can easily remove spatter from a muffler body. [Means for solving the problem]

[0006] One aspect of the present invention is an exhaust device that directs exhaust gases emitted from an engine to the outside, and comprises a cylindrical muffler body in which a silencing chamber is formed, a baffle plate that separates the silencing chamber into front and rear sections, and an exhaust pipe attached to the front of the muffler body, wherein the baffle plate has a communicating passage connecting the front and rear of the silencing chamber, and the exhaust pipe has an opening that connects the front side of the silencing chamber with the inside of the exhaust pipe, and the muffler body is tilted forward to form an exhaust route for spatter that passes through the communicating passage and the opening, thereby solving the above-mentioned problem. [Effects of the Invention]

[0007] According to an exhaust system of one aspect of the present invention, by tilting the muffler body forward, spatter moves from the rear side of the silencer chamber to the front side through the communication passage, and then moves from the front side of the silencer chamber to the inside of the exhaust pipe through the opening and is discharged to the outside. Even if spatter is generated during the manufacturing of the muffler, tilting the muffler body forward makes it easy to remove the spatter from inside the muffler body. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a right side view of the saddle-ride type vehicle of the present embodiment. [Figure 2] FIG. 2 is a right side view of the exhaust device of the present embodiment. [Figure 3] FIG. 2 is a left side view of the exhaust device of the present embodiment. [Figure 4] FIG. 2 is a side view of the inside of the muffler of the present embodiment. [Figure 5] FIG. 2 is a perspective view of the spatter discharge structure of the present embodiment as seen from the rear. [Figure 6] FIG. 2 is a perspective view of the spatter discharge structure of the present embodiment as seen from the front. [Figure 7]1A to 1C are diagrams illustrating an example of manufacturing the exhaust device of the present embodiment. [Figure 8] 1A to 1C are diagrams illustrating an example of manufacturing the exhaust device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] An exhaust system according to one aspect of the present invention guides exhaust gases emitted from an engine to the outside. The exhaust system is provided with a cylindrical muffler body. The muffler body's silencing chamber is divided into front and rear sections by a baffle plate, and an exhaust pipe is attached to the front of the muffler body. The baffle plate has a communication passage connecting the front and rear of the silencing chamber, and the exhaust pipe has an opening connecting the front of the silencing chamber to the inside of the exhaust pipe. By tilting the muffler body forward, a discharge route for spatter is formed through the communication passage and the opening. Spatter moves from the rear to the front of the silencing chamber through the communication passage, and from the front of the silencing chamber through the opening to the inside of the exhaust pipe and is discharged to the outside. Even if spatter is generated during the manufacture of the muffler, tilting the muffler body forward makes it easy to remove the spatter from inside the muffler body. [Example]

[0010] A saddle-riding type vehicle equipped with an exhaust system of this embodiment will be described below with reference to the accompanying drawings. Fig. 1 is a right side view of the saddle-riding type vehicle of this embodiment. In the following drawings, arrow Fr indicates the front of the vehicle, arrow Re indicates the rear of the vehicle, arrow L indicates the left side of the vehicle, and arrow R indicates the right side of the vehicle.

[0011] As shown in Fig. 1, a saddle-type vehicle 1 is configured by attaching various covers to an underbone-type body frame as the exterior of the vehicle. A front cover 11 is provided at the front of the vehicle, and a front leg shield 12 that protects the rider's legs is provided behind the front cover 11. A floor board 13 extends rearward from the lower end of the front leg shield 12, and a body cover 14 and a pair of side covers 15 are provided behind the floor board 13. A seat 16 consisting of a series of seating surfaces for the driver and passenger is provided above the side cover 15.

[0012] Handlebars 21 are provided above front cover 11, and a front wheel 23 is rotatably supported below front cover 11 via a pair of front forks 22. A unit swing-type engine 24 is provided below side cover 15. The engine 24 is swingably connected to the body frame, and a rear wheel 27 is rotatably supported at the rear of engine 24. Exhaust pipes 35, 41 extend from engine 24 toward the rear of the vehicle, and a muffler 51 is connected downstream of exhaust pipes 35, 41. Muffler 51 is supported on the right side of engine 24 via a support bracket 53.

[0013] Mufflers are manufactured by welding, and spatter generated during welding can cause abnormal noise. If the internal structure of the muffler is simple, a magnetic tool can be inserted through the opening in the muffler body, and the spatter can be attached to the magnet at the tip of the tool and removed from the muffler body. Shaking the muffler body up and down to lift the spatter can also allow it to be ejected to the outside through a pipe inside the muffler body. Furthermore, spatter can be removed by drilling a hole in the muffler body. In this case, after the spatter is removed, the hole in the muffler body can be filled by welding or other means.

[0014] However, in recent years, the internal structure of mufflers has become more complex in order to improve noise reduction performance. Using a magnetic tool makes it difficult to insert the magnetic tool inside the muffler body, and shaking the muffler body up and down makes it difficult to shake out the spatter. These methods are heavily dependent on the skill of the worker. Drilling holes in the muffler body requires the worker to fill the holes, which places a heavy burden on the worker. Therefore, in this embodiment, grooves or openings are provided in the baffle plate or exhaust pipe inside the muffler body to form a spatter discharge route, and the muffler body can be tilted forward to discharge the spatter to the outside.

[0015] The exhaust device of this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a right side view of the exhaust device of this embodiment, and Figure 3 is a left side view of the exhaust device of this embodiment.

[0016] As shown in Figures 2 and 3, the exhaust system 30 is formed by connecting an expanded diameter pipe 31, a catalyst case 32, a reduced diameter pipe 34, a first exhaust pipe (another exhaust pipe) 35, a second exhaust pipe (exhaust pipe) 41, a muffler 51, and a tailpipe 55. These components form an exhaust passage extending from the engine 24 (see Figure 1) to the rear of the vehicle. The expanded diameter pipe 31 extends downward from the exhaust port of the engine 24 and then curves to the right. The expanded diameter pipe 31 expands in diameter toward the downstream side, and a mounting boss 37 for an exhaust gas sensor (not shown) is provided at the small diameter portion of the expanded diameter pipe 31. The expanded diameter pipe 31 has a bun-shaped structure consisting of front and rear pipe halves.

[0017] The catalyst case 32 and the reduced diameter pipe 34 are formed as a single unit. The catalyst case 32 extends rightward from the downstream end of the expanded diameter pipe 31, and the reduced diameter pipe 34 curves rearward from the downstream end of the catalyst case 32. The catalyst case 32 is located directly below the cylinder head, and a large catalyst 33 is housed inside the catalyst case 32. Air pollutants such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen compounds (NOx) in the exhaust gas are purified as the exhaust gas passes through the catalyst 33. The catalyst case 32 and the reduced diameter pipe 34 are formed in a sandwich structure consisting of upper and lower pipe halves.

[0018] The first exhaust pipe 35 extends rearward from the downstream end of the reduced diameter pipe 34, passing to the right of the engine 24. A mounting boss 45 for an exhaust gas sensor (not shown) is provided downstream of the first exhaust pipe 35. The mounting boss 45 protrudes inward in the vehicle width direction from the outer surface of the first exhaust pipe 35. An exhaust gas sensor is installed in each of the mounting bosses 37, 45, and the exhaust gas sensor detects the oxygen concentration in the exhaust gas. The detection result of the exhaust gas sensor upstream of the catalyst 33 is used for feedback control of the fuel injection amount, and the detection result of the exhaust gas sensor downstream of the catalyst 33 is used for diagnosing deterioration of the catalyst 33.

[0019] The second exhaust pipe 41 enters inside the muffler body 52 of the muffler 51, and the upstream end 42 of the second exhaust pipe 41 protrudes forward from the muffler body 52. ​​The downstream end 36 of the first exhaust pipe 35 is inserted into the upstream end 42 of this second exhaust pipe 41, and the first and second exhaust pipes 35, 41 form a double-pipe exhaust pipe structure near the muffler 51. The upstream end 42 of the second exhaust pipe 41 is formed with an obliquely cut inclined end face 43, and this inclined end face 43 of the second exhaust pipe 41 is joined to the outer peripheral surface of the first exhaust pipe 35 by welding. A tip 44 of the inclined end face 43 is positioned outward in the vehicle width direction so as not to interfere with the mounting boss 45.

[0020] The muffler body 52 of the muffler 51 is formed into a cylindrical shape by left and right case halves. A front opening is formed in the muffler body 52, and the outer peripheral surface of the second exhaust pipe 41 is welded to the edge of the opening of the muffler body 52. ​​A silencing chamber is formed inside the muffler body 52, and exhaust gas flows from the second exhaust pipe 41 into the silencing chamber, causing the exhaust gas to expand and reducing exhaust noise. A rear opening is formed in the muffler body 52, and a tail pipe 55 protrudes rearward from the rear opening of the muffler body 52. ​​Exhaust gas in the silencing chamber is discharged to the outside through the tail pipe 55.

[0021] In this way, exhaust gas emitted from the engine 24 is guided to the outside by the exhaust device 30. The exhaust gas is purified by passing through the catalyst 33, and exhaust noise is reduced by passing through the muffler 51. A support bracket 53 is attached to the front of the muffler body 52, and a pair of upper and lower arms 54 extend forward from the support bracket 53. The tip ends of the pair of arms 54 are screwed to the engine case 25 (see FIG. 5), and the muffler body 52 is supported on the engine case 25 via the support bracket 53.

[0022] The internal structure of the muffler will be described with reference to Figures 4 to 6. Figure 4 is a side view of the inside of the muffler of this embodiment. Figure 5 is a perspective view of the sputter discharge structure of this embodiment as seen from the rear. Figure 6 is a perspective view of the sputter discharge structure of this embodiment as seen from the front.

[0023] As shown in Figure 4, the muffler body 52 of the muffler 51 is cylindrical, and a silencing chamber 65 is formed in the muffler body 52. ​​The silencing chamber 65 of the muffler body 52 is divided into front and rear sections by a baffle plate 61, and is separated into first and second silencing chambers 66, 67. The rear side of the baffle plate 61 forms the first silencing chamber 66, and the front side of the baffle plate 61 forms the second silencing chamber 67. A second exhaust pipe 41 is attached to the lower front side of the muffler body 52. ​​The upstream side of the second exhaust pipe 41 protrudes outside from the front of the muffler body 52, and the downstream end of the second exhaust pipe 41 is fixed in a through-hole in the lower part of the baffle plate 61.

[0024] A U-shaped pipe 68 is connected to the downstream end of the second exhaust pipe 41. The U-shaped pipe 68 extends rearward from the downstream end of the second exhaust pipe 41 and then bends back forward. The downstream end of the U-shaped pipe 68 is positioned in the first silencing chamber 66, and exhaust gas is introduced from the U-shaped pipe 68 into the first silencing chamber 66. The downstream end of the U-shaped pipe 68 faces the baffle plate 61, and exhaust gas is blown from the downstream end of the U-shaped pipe 68 onto the baffle plate 61. In the first silencing chamber 66, exhaust noise is reduced not only by the expansion of the exhaust gas introduced from the U-shaped pipe 68, but also by utilizing the reflection of the exhaust gas at the baffle plate 61 (sound wave interference).

[0025] A straight connecting pipe 69 passes through approximately the center of the baffle plate 61, and the first and second silencing chambers 66, 67 are connected through the connecting pipe 69. The upstream side of the connecting pipe 69 is adjacent to the downstream side of the U-shaped pipe 68, and the connecting pipe 69 and the U-shaped pipe 68 are fixed via a plate member 70. The downstream end of the connecting pipe 69 is positioned in the second silencing chamber 67, and exhaust gas is introduced from the connecting pipe 69 into the second silencing chamber 67. The downstream end of the connecting pipe 69 faces the inner surface of the muffler body 52, and exhaust gas is blown from the downstream end of the connecting pipe 69 against the muffler body 52. ​​Exhaust noise is also reduced in the second silencing chamber 67 by the expansion and reflection of the exhaust gas.

[0026] A tail pipe 55 is attached to the upper rear side of the muffler body 52. ​​The upstream side of the tail pipe 55 is fixed in a through hole in the upper part of the baffle plate 61, and the downstream side of the tail pipe 55 protrudes to the outside from the rear of the muffler body 52. ​​The upstream end of the tail pipe 55 is sealed with a cap, and countless punched holes 56 are formed in the side surface of the upstream end of the tail pipe 55. The countless punched holes 56 are positioned in the second silencing chamber 67, and exhaust gas enters the tail pipe 55 from the second silencing chamber 67 and is then discharged to the outside. The countless punched holes 56 are formed to a size that does not allow spatter to pass through.

[0027] As shown in Figure 5, a peripheral wall 62 extends forward from the outer edge of the bottom surface of the baffle plate 61, and the peripheral wall 62 of the baffle plate 61 contacts the inner surface of the muffler body 52. ​​The lower part of the peripheral wall 62 of the baffle plate 61 is partially cut out to form a communication groove (communication passage) 63 in the baffle plate 61 that connects the first and second silencing chambers 66, 67. The communication groove 63 is formed with a groove width larger than the particle size of the spatter, and is formed so that not only the spatter but also water within the muffler body 52 can pass through the communication groove 63 from the first silencing chamber 66 to the second silencing chamber 67. The communication groove 63 extends along the joint surfaces of the left and right case halves of the muffler body 52.

[0028] As shown in Figure 6, the lower front side of the muffler body 52 protrudes in a cylindrical shape, and the second exhaust pipe 41 is attached to a mounting opening in a cylindrical portion 57. An opening 46 that connects the inside of the first silencing chamber 66 to the inside of the second exhaust pipe 41 is formed in the underside of the second exhaust pipe 41, adjacent to the rear of the cylindrical portion 57 of the muffler body 52. ​​The opening 46 is formed with a diameter larger than the particle size of the spatter, and is formed so that the spatter can pass through the opening 46 from the second silencing chamber 67 to the inside of the second exhaust pipe 41. At the front end of the muffler body 52, the center of the opening 46 is positioned directly above the joint surfaces of the left and right case halves of the muffler body 52.

[0029] A slope 58 is formed on the rear side of the cylindrical portion 57 of the muffler body 52. ​​The inclined surface of the slope 58 faces the opening 46 of the second exhaust pipe 41, and the slope 58 guides spatter to the opening 46. More specifically, the front end of the slope 58 is connected to the underside of the second exhaust pipe 41 on the front side of the opening 46 so that the spatter is guided to the opening 46. The slope 58 makes it easier for the spatter to enter the opening 46, improving the workability of removing the spatter from the muffler body 52. ​​The joint surfaces of the left and right case halves of the muffler body 52 divide the slope 58 into left and right halves, and slight steps and gaps on this joint surface function as a guide for the spatter.

[0030] In this way, in the muffler 51, a spatter discharge route that passes through the communicating groove 63 and the opening 46 is formed by tilting the muffler body 52 forward, making it possible to easily remove spatter from inside the muffler body 52. ​​As described above, the communicating groove 63 and the opening 46 are located on the joint surface of the case halves of the muffler body 52, and when viewed from the center line C that passes through the muffler body 52 from front to rear, the orientation of the position where the communicating groove 63 is formed matches the orientation of the position where the opening 46 is formed. This makes it easier to direct spatter from the communicating groove 63 to the opening 46 in a straight line without tilting the muffler body 52 in various directions, improving the workability of the spatter discharge operation.

[0031] Additionally, a drain hole 59 (see Figure 5) is formed in a slope 58 at the front of the muffler body 52. ​​The muffler 51 is mounted on the vehicle so that the communication groove 63 faces downward, and the drain hole 59 is positioned in the lowest position when mounted on the vehicle. When water is generated inside the muffler body 52, it moves along the inner surface of the muffler body 52 to a lower position and is discharged to the outside through the communication groove 63 and the drain hole 59. Additionally, the diameter of the drain hole 59 is smaller than that of the opening 46, and it is positioned behind the opening 46. Although a hole is formed in the muffler body 52, the diameter of the drain hole 59 is sufficiently small so that the effect on exhaust noise and output is kept to a minimum.

[0032] The manufacture of the exhaust device will be described with reference to Figures 7 and 8. Figures 7 and 8 are diagrams showing an example of the manufacture of the exhaust device of this embodiment. Note that Figure 7(A) shows the manufacturing work of the first and second component units of the exhaust device, Figure 7(B) shows the spatter removal work, and Figures 8(A) and (B) show the exhaust pipe joining work.

[0033] As shown in FIG. 7(A), the exhaust device 30 is manufactured separately into a first component unit 71 located upstream of the first exhaust pipe 35 and a second component unit 72 located downstream of the second exhaust pipe 41. The first component unit 71 is formed by joining the expanded pipe 31, the catalyst case 32, the reduced pipe 34, and the first exhaust pipe 35, while the second component unit 72 is formed by joining the second exhaust pipe 41, the muffler 51, and the tail pipe 55. When the muffler 51 is manufactured, spatter is generated on the inside of the muffler body 52, and it is necessary to remove the spatter from the inside of the muffler body 52 before joining the first and second component units 71, 72 together.

[0034] As shown in Figure 7(B), during the operation of discharging spatter 73, muffler body 52 is tilted forward and the upstream end of second exhaust pipe 41 is directed downward. Spatter 73 in first silencing chamber 66 is collected in communicating groove 63 of baffle plate 61, passes from first silencing chamber 66 through communicating groove 63, and enters second silencing chamber 67. Spatter 73 in second silencing chamber 67 is guided by slope 58 to opening 46 of second exhaust pipe 41, passes from second silencing chamber 67 through opening 46, and is discharged to the outside from the upstream end of second exhaust pipe 41. This is before the first and second component units 71, 72 are joined, and the unit size is small and lightweight, so the workload on the worker is reduced.

[0035] 8(A) and 8(B), once the operation of discharging the spatter 73 is completed, the first and second component units 71 and 72 are combined to manufacture the exhaust device 30. At this time, the first exhaust pipe 35 is formed to have a smaller diameter than the second exhaust pipe 41, the downstream end 36 of the first exhaust pipe 35 is inserted inside the upstream end 42 of the second exhaust pipe 41, and the opening 46 is blocked from the inside by the downstream end 36 of the first exhaust pipe 35. The upstream end 42 of the second exhaust pipe 41 is then joined to the outer peripheral surface of the downstream end 36 of the first exhaust pipe 35. Blocking the opening 46 after discharging the spatter 73 reduces the impact on exhaust noise and output, and no special component is required to block the opening 46.

[0036] As described above, according to the exhaust device 30 of this embodiment, by tilting the muffler body 52 forward, the spatter 73 moves from the second silencing chamber 67 to the first silencing chamber 66 through the communicating groove 63, and then moves from the second silencing chamber 67 to the inside of the second exhaust pipe 41 through the opening 46 and is discharged to the outside. Even if the spatter 73 is generated during the manufacture of the muffler 51, the spatter 73 can be easily removed from the inside of the muffler body 52 by tilting the muffler body 52 forward.

[0037] In this embodiment, a single-cylinder engine is exemplified, but the type of engine is not particularly limited, and may be, for example, a multi-cylinder engine having two or more cylinders. Also, although a unit swing type engine is exemplified, the engine is not limited to the unit swing type.

[0038] In this embodiment, the baffle plate has a communication groove as a communication passage, but the communication passage may be formed in the baffle plate so as to connect the front and rear of the silencing chamber. For example, the communication passage may be a through hole formed near the outer edge of the baffle plate.

[0039] In addition, in this embodiment, a communicating groove is formed in the lower part of the baffle plate and an opening is formed in the lower surface of the second exhaust pipe, but the communicating groove and opening may be formed in a position where a discharge route for spatter can be formed by tilting the muffler body forward.

[0040] In addition, although a single baffle plate is installed inside the muffler body in this embodiment, multiple baffle plates may be installed inside the muffler body. In this case, a communication groove connecting the front and rear of the silencing chamber is formed in each of the multiple baffle plates.

[0041] Furthermore, the internal structure of the muffler is not limited to the above structure, and it is sufficient that at least a baffle plate and a second exhaust pipe are installed inside the muffler body.

[0042] Furthermore, the exhaust system of this embodiment is not limited to the saddle-ride type vehicle described above, and may be used in other types of saddle-ride type vehicles. Note that a saddle-ride type vehicle is not limited to all vehicles in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0043] As described above, the first aspect is an exhaust system (30) that guides exhaust gas emitted from an engine (24) to the outside, and includes a cylindrical muffler body in which a silencing chamber (65) is formed, a baffle plate (61) that separates the silencing chambers (first and second silencing chambers 66, 67) into front and rear chambers, and an exhaust pipe (second exhaust pipe 41) attached to the front of the muffler body, wherein the baffle plate is formed with a communication passage (communication groove 63) connecting the front and rear of the silencing chamber, and the exhaust pipe is formed with an opening (46) that connects the front side of the silencing chamber with the inside of the exhaust pipe, and tilting the muffler body forward forms a discharge route for spatter (73) that passes through the communication passage and the opening. With this configuration, tilting the muffler body forward causes spatter to move from the rear side of the silencing chamber to the front side through the communication passage, and then moves from the front side of the silencing chamber to the inside of the exhaust pipe through the opening and is discharged to the outside. Even if spatter occurs during the manufacturing of the muffler, the spatter can be easily removed from the inside of the muffler body by tilting the muffler body forward.

[0044] In the second aspect, the orientation of the forming position of the communication passage and the orientation of the forming position of the opening are the same as those of the first aspect when viewed from the center line (C) that passes through the muffler body from front to back. With this configuration, it is easier to direct spatter from the communication passage to the opening in a straight line without tilting the muffler body in various directions, improving the workability of the spatter discharge operation.

[0045] In a third aspect, in the first or second aspect, another exhaust pipe (first exhaust pipe 35) is provided that is connected to the upstream side of the exhaust pipe, and an upstream end portion (42) of the exhaust pipe protrudes to the outside from the muffler body, and a downstream end portion (36) of the other exhaust pipe is joined to the upstream end portion of the exhaust pipe. With this configuration, the spatter removal work is performed before the other exhaust pipe is joined to the exhaust pipe, thereby reducing the workload of the worker.

[0046] In a fourth aspect, in any one of the first to third aspects, the downstream end of the other exhaust pipe is inserted inside the upstream end of the exhaust pipe, and the opening is blocked from the inside by the downstream end of the other exhaust pipe. With this configuration, the opening of the exhaust pipe improves the workability of the spatter discharge operation, and the impact on exhaust noise and output is reduced by blocking the opening of the exhaust pipe after the spatter is discharged. Furthermore, there is no need to add a special part to block the opening of the exhaust pipe.

[0047] In a fifth aspect, in any one of the first to fourth aspects, the muffler body is formed with a slope (58) that guides spatter to the opening. With this configuration, the slope makes it easier for the spatter to enter the opening, improving the workability of discharging the spatter.

[0048] In a sixth aspect, in any one of the first to fifth aspects, the muffler body is mounted on the vehicle with the communication passage facing downward, and a drain hole (59) is formed in the front part of the muffler body so that it is positioned at the lowest position. With this configuration, water generated inside the muffler body can be discharged to the outside through the communication passage and the drain hole.

[0049] In a seventh aspect, in the sixth aspect, the drain hole has a smaller diameter than the opening and is located behind the opening. With this configuration, the drain hole has a small diameter, so that the impact on exhaust noise and output is minimized.

[0050] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0051] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0052] 24: Engine 35: First exhaust pipe (other exhaust pipe) 36: Downstream end 41: Second exhaust pipe (exhaust pipe) 42: Upstream end 46 :Aperture 51: Muffler 52: Muffler body 58: Slope 59: Drain hole 61: Baffle plate 63:Communication groove 65: Sound deadening room 66: First sound-absorbing chamber 67: Second soundproofing chamber 73: Sputter C: Center line

Claims

1. An exhaust device that guides exhaust gas emitted from an engine to the outside, a cylindrical muffler body in which a sound-reducing chamber is formed; a baffle plate that divides the sound-absorbing chamber into front and rear sections; an exhaust pipe attached to a front portion of the muffler body, A communication passage is formed in the baffle plate, connecting the front and rear of the sound-absorbing chamber, an opening is formed in the exhaust pipe, the opening connecting the front side of the muffling chamber and the inside of the exhaust pipe; an exhaust system in which a spatter discharge route passing through the communication passage and the opening is formed by the forward tilt of the muffler body;

2. 2. The exhaust system according to claim 1, wherein, when viewed from a center line passing through the muffler body from front to rear, the orientation of the position where the communication passage is formed coincides with the orientation of the position where the opening is formed.

3. another exhaust pipe connected to the upstream side of the exhaust pipe, an upstream end of the exhaust pipe protruding outward from the muffler body; 3. The exhaust system according to claim 1, wherein the downstream end of the other exhaust pipe is joined to the upstream end of the exhaust pipe.

4. the downstream end of the other exhaust pipe is inserted inside the upstream end of the other exhaust pipe, 4. The exhaust system according to claim 3, wherein the opening is blocked from the inside by the downstream end of the other exhaust pipe.

5. 3. The exhaust system according to claim 1, wherein the muffler body is formed with a slope for guiding the spatter to the opening.

6. 3. The exhaust system according to claim 1, wherein the muffler body is mounted on the vehicle so that the communication passage faces downward, and a drain hole is formed in the front part of the muffler body so that the drain hole is positioned at the lowest position.

7. 7. The exhaust system according to claim 6, wherein the drain hole has a diameter smaller than that of the opening and is located behind the opening.

Images