JP2012097616A - Exhaust device for straddle type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust device for a straddle type vehicle capable of increasing arrangement flexibility at low cost.SOLUTION: The exhaust device 60B includes an exhaust pipe 171, an exhaust pipe 172, and a confluence part 173. The confluence part 173 includes connection ports 175, 177, and a flow straightening part is provided in the confluence part 173. The confluence part 173 is formed by welding a plurality of plate members. If the confluence part is formed by welding two plate members, the number of components is reduced as compared with the case in which the plate members are coupled by a fastening component. The manufacturing cost of the confluence part is reduced, and the manufacturing cost of the exhaust device 60B is suppressed. Further, because the flow straightening part is provided in the confluence part 173, the entire device is miniaturized. The arrangement flexibility of the exhaust device 60B is thereby increased.

Description

  The present invention relates to an exhaust device for a saddle-ride type vehicle equipped with a V-type engine.

  Various exhaust systems for V-type engines have been proposed as exhaust systems for saddle-ride type vehicles (see, for example, Patent Document 1 (FIGS. 4 and 5)).

  As shown in FIG. 4 of Patent Document 1, in the exhaust device (33) for a V-type four-cylinder engine, two front exhaust pipes (61L, 61R) are assembled by a front collecting pipe (62). The rear end of the pipe (62) is connected to the catalyst pipe (63). In addition, the two rear exhaust pipes (71L, 71R) are assembled by a rear collecting pipe (74). Thereafter, the front end of the collecting pipe (74) is connected to the expansion pipe (75), and the expansion pipe (75) is connected to the catalyst pipe (63).

  In FIG. 5 of Patent Document 1, the exhaust gas flowing out from the front exhaust pipe (61L, 61R) flows along the front collecting pipe (62). Further, the exhaust gas flowing out of the rear exhaust pipes (71L, 71R) flows along the rear collecting pipe (74) and the expansion pipe (75) bent in a U shape. That is, since the exhaust gas that has passed through the front collecting pipe (62) can be prevented from flowing into the rear collecting pipe (74), the engine output can be maintained.

  By the way, the exhaust device (33) includes two front exhaust pipes (61L, 61R), a front collecting pipe (62), two rear exhaust pipes (71L, 71R), and a rear collecting pipe (74). And an expansion pipe (75) and a catalyst pipe (63). Since there are many parts which comprise an exhaust apparatus (33), the cost of an apparatus becomes high.

  Further, the rear exhaust pipes (71L, 71R) are extended forward. The expansion pipe (75) connected to the rear exhaust pipe (71L, 71R) is bent in a U shape. Since the exhaust device (33) includes the rear exhaust pipes (71L, 71R) and the expansion pipe (75) as described above, the size is increased. By increasing the size of the exhaust device (33), the degree of freedom of arrangement of the exhaust device (33) is reduced.

  Therefore, there is a need for a saddle-ride type vehicle exhaust device that is low in cost and can increase the degree of freedom of arrangement.

JP 2010-007610 A

  An object of the present invention is to provide a saddle-ride type vehicle exhaust device that is low in cost and can increase the degree of freedom of arrangement.

  According to a first aspect of the present invention, there is provided a first bank exhaust pipe extending from a first bank cylinder of a V-type engine, a second bank exhaust pipe extending from a second bank cylinder of the V-type engine, and the first bank exhaust pipe. In the saddle-riding type vehicle exhaust device, comprising: a tip portion and a gathering portion in which the tip of the second bank exhaust pipe gathers, the gathering portion is formed by welding a plurality of plate-like members, and the first A first connection port to which the tip of the bank exhaust pipe is connected and a second connection port to which the tip of the second bank exhaust pipe is connected, and flows in from at least one of the first connection port and the second connection port A rectifying unit that bends the flow of exhaust gas approximately 90 ° is provided inside the collecting unit.

  In the invention according to claim 2, the first bank cylinder is a front bank cylinder disposed on the front side in the vehicle longitudinal direction of the V-type engine, and the second bank cylinder is disposed on the vehicle longitudinal direction rear side of the V-type engine. The first connection port is disposed at the front portion in the vehicle front-rear direction of the assembly portion, the second connection port is disposed at the vehicle width direction side portion of the assembly portion, It is a rear side baffle plate provided downstream of the second connection port.

  In the invention according to claim 3, a front rectifier plate that allows exhaust gas to flow in a predetermined direction is provided downstream of the first connection port, in addition to the rear rectifier plate, and the front rectifier plate, the rear rectifier plate, Are adjacent to each other.

  In the invention according to claim 4, the V-type engine is a total four-cylinder engine including a front bank cylinder having two cylinders and a rear bank cylinder having two cylinders, the first connection port and the front bank. The cylinder is connected by two first bank exhaust pipes, the second connection port and the rear bank cylinder are connected by two second bank exhaust pipes, and the two first bank exhaust pipes are connected. Are assembled in the vicinity of the front rectifying plate, and at least one of the two first bank exhaust pipes is configured such that exhaust gas passing through the inside flows perpendicularly to the front rectifying plate. It is characterized by.

  In the invention which concerns on Claim 5, a gathering part is a hollow member which combines an upper half body and a lower half body, and the catalyst arrange | positioned downstream from a rectification | straightening part is accommodated in the inside of the said hollow member. It is characterized by that.

  The invention according to claim 6 is characterized in that an oxygen sensor is attached to the hollow member so as to be disposed between the rectifying unit and the catalyst.

  In the invention according to claim 1, the assembly portion is formed by welding a plurality of plate-like members. For example, when two plate-like members are welded to form a collective portion, the number of parts in the collective portion can be reduced as compared to the case where the plate-like members are joined together with fastening parts such as bolts and nuts. By reducing the number of parts, the manufacturing cost of the collecting portion is reduced, so that the cost for the exhaust device can be suppressed.

In addition, a rectification unit that bends the flow of the exhaust gas flowing in from at least one of the first connection port and the second connection port by approximately 90 ° is provided inside the assembly portion. In the present invention, since the rectifying section is provided in the collecting section, the size of the entire exhaust device is reduced. The degree of freedom in arrangement can be increased by downsizing the exhaust device.
Therefore, according to the present invention, it is possible to provide a saddle-ride type vehicle exhaust device that is low in cost and can increase the degree of freedom of arrangement.

  The exhaust system further includes a first bank exhaust pipe extending from the first bank cylinder of the V-type engine, a second bank exhaust pipe extending from the second bank cylinder of the V-type engine, and a collecting portion. The collecting portion has a first connection port to which the tip of the first bank exhaust pipe is connected and a second connection port to which the tip of the second bank exhaust pipe is connected. That is, after the exhaust gas flows into the collecting portion through the first bank exhaust pipe and the second bank exhaust pipe, the flow of the exhaust gas can be made to follow the collecting portion, so that the engine output can be maintained. .

  In the invention according to claim 2, the first bank cylinder is disposed on the front side in the vehicle front-rear direction of the V-type engine, and the second bank cylinder is disposed on the rear side in the vehicle front-rear direction of the V-type engine. Since the two bank cylinders are arranged in the vehicle front-rear direction, the size of the engine in the vehicle width direction can be reduced, and the overall size of the exhaust device can be further reduced.

  In addition, the aggregate portion is formed of a plate member. Since it is easy to open a connection port in a plate-shaped member, a 2nd connection port can be easily provided in the side part of a gathering part.

  In the invention according to claim 3, a front rectifying plate that allows exhaust gas to flow in a predetermined direction is provided downstream of the first connection port, in addition to the rear rectifying plate, and the front rectifying plate and the rear rectifying plate are Adjacent. The exhaust gas exhausted from the front bank cylinder flows along the front rectifying plate, and the exhaust gas exhausted from the rear bank cylinder flows along the rear rectifying plate. That is, the exhaust gas from the front bank cylinder can flow in a predetermined direction by the front rectifying plate without being affected by the rear rectifying plate.

  In a fourth aspect of the invention, the V-type engine is a total of four cylinders including a front bank cylinder having two cylinders and a rear bank cylinder having two cylinders. In addition, the first connection port and the front bank cylinder are connected by two first bank exhaust pipes, and these first bank exhaust pipes are assembled in the vicinity of the front rectifying plate. That is, the tips of the two first bank exhaust pipes are arranged in the vicinity of the front rectifying plate, so that the exhaust gas that has passed through the two first bank exhaust pipes easily flows along the front rectifying plate. Therefore, the exhaust gas that has passed through the two first bank exhaust pipes is more reliably rectified.

  In the invention which concerns on Claim 5, a gathering part is a hollow member which combines an upper half body and a lower half body. Since the hollow collecting portion is divided, the front rectifying plate and the rear rectifying plate can be easily provided inside the collecting portion.

  In addition, a catalyst disposed downstream of the rectifying unit is accommodated in the hollow member. A hollow member refers to a gathering part. That is, the assembly portion is a hollow member and also serves as a catalyst storage portion. Since the catalyst storage part is provided in the assembly part, it is not necessary to prepare a catalyst pipe separately, and the number of components constituting the exhaust device can be reduced.

  In the invention which concerns on Claim 6, the oxygen sensor is attached to the hollow member so that it may be arrange | positioned between a rectification | straightening part and a catalyst. When a part of the exhaust gas that has passed along the rectifying unit hits the oxygen sensor, a part of the exhaust gas flow that hits it diffuses just before the catalyst. Therefore, the exhaust gas can be allowed to flow evenly on the front surface of the catalyst.

1 is a left side view of a saddle-ride type vehicle according to the present invention. It is a left view of a V type engine and an exhaust device. It is a top view of an exhaust apparatus. FIG. 4 is a view taken along arrow 4 in FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. It is a figure explaining the flow of exhaust gas. It is a figure which shows the example of a change of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. The saddle riding type vehicle will be described using a motorcycle. The front, rear, left and right, and top and bottom used in the following description are determined based on the passenger sitting on the passenger seat.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the body frame 11 of the motorcycle 10 includes a head pipe 12, a main frame 13 extending rearward from the head pipe 12, and a rear end portion of the main frame 13 rearward. The seat rail 14 is extended.

  A front fork 15 is attached to the head pipe 12 so as to be steerable. A front wheel 16 is rotatably attached to the lower end of the front fork 15, and a steering handle 17 is attached to the upper end of the front fork 15.

  A V-type engine 20 (details will be described later) is attached to the main frame 13. A pivot plate 41 is attached to the rear portion of the V-type engine 20, and a rear swing arm 43 is pivotally attached to the pivot plate 41 with a pivot shaft 42. A rear wheel 44 is rotatably attached to the rear end portion of the rear swing arm 43.

  In addition, a fuel tank 45 is attached to the main frame 13, and an occupant seat 46 is attached to the seat rail 14 so as to be positioned behind the fuel tank 45.

  The front of the head pipe 12 is covered with an upper cowl 47. Further, the upper side of the head pipe 12 and the side of the main frame 13 are covered with an upper side cover 48, and the side of the lower part of the head pipe 12 and the side of the front of the V-type engine 20 are covered with a lower side cover 49. ing. The front of the V-type engine 20 is covered with an under cover 51.

A front fender 52 is provided on the front fork 15 so as to cover the top of the front wheel 16. A rear fender 53 is provided at the rear end portion of the seat rail 14 so as to cover an obliquely upper rear side of the rear wheel 44.
In addition, an exhaust device 60 </ b> A (detailed later) including a muffler 54 is attached to the V-type engine 20. Next, the configuration of the V-type engine 20 and the exhaust device 60A will be described with reference to FIG.

  As shown in FIG. 2, the V-type engine 20 has two bank cylinders, a first bank cylinder and a second bank cylinder. The first bank cylinder is a front bank cylinder 21 disposed on the front side in the vehicle front-rear direction of the V-type engine 20, and the second bank cylinder is a rear bank cylinder disposed on the rear side in the vehicle front-rear direction of the V-type engine 20. 22.

  The first bank cylinder is disposed on the front side in the vehicle front-rear direction of the V-type engine 20, and the second bank cylinder is disposed on the rear side in the vehicle front-rear direction. Since the two bank cylinders are arranged in the vehicle front-rear direction, the size of the engine 20 in the vehicle width direction can be reduced, and the overall size of the exhaust device 60A can be further reduced.

  In addition, the front bank cylinder 21 has two cylinders in the vehicle width direction, and the rear bank cylinder 22 has two cylinders in the vehicle width direction. In other words, the V-type engine 20 is a four-cylinder engine including a front bank cylinder 21 having two cylinders and a rear bank cylinder 22 having two cylinders.

  Further, the front bank cylinder 21 includes a front cylinder block 24 that extends forward and upward from the crankcase 23, a front cylinder head 26 that is attached to the front cylinder block 24 and includes a left front exhaust part 25 and a right front exhaust part, The front cylinder head cover 27 is attached to the front cylinder head 26. The rear bank cylinder 22 includes a rear cylinder block, a rear cylinder head 29 that is attached to the rear cylinder block and includes a left rear exhaust portion 28 and a right rear exhaust portion, and a rear cylinder head cover 31. .

  The exhaust device 60A includes a first left bank exhaust pipe 61 extending rearward from the left front exhaust portion 25 of the front cylinder head 26, and a first right bank exhaust extending rearward from the right front exhaust portion of the front cylinder head 26. A pipe 62, a second left bank exhaust pipe 63 extending downward from the left rear exhaust part 28 of the rear cylinder head 29, and a second extending downward from the right rear exhaust part of the rear cylinder head 29. A second collecting member 65 connected to the right bank exhaust pipe 64, the lower end of the second left bank exhaust pipe 63 and the lower end of the second right bank exhaust pipe 64, and two exhaust pipes 63 and 64 gather together (details will be described later). ), A relay exhaust pipe 66 connected to the front end of the second collective member 65 and extending forward and downward, and the front end of the relay exhaust pipe 66 are connected, and the rear end of the first left bank exhaust pipe 61 And the first right bank exhaust pipe 62 Trailing edge and a collecting portion 70 (details described later) two exhaust tubes 61 and 62 are connected is set,

A connecting member 71 is attached to the upper end of the central portion of the collective portion 70 in the vehicle front-rear direction. The connection member 71 is fastened with a bolt 73 to a support member 72 extending from the rear lower end of the V-type engine 20. That is, the gathering unit 70 is supported by the V-type engine 20.
Further, a relay exhaust pipe 74 is connected to the rear end of the collecting portion 70, and this relay exhaust pipe 74 is connected to a muffler (FIG. 1, reference numeral 54).

The upper side of the rear portion in the vehicle front-rear direction of the collective portion 70 is covered with an upper cover plate 75, and the lower side of the central portion of the collective portion 70 in the vehicle front-rear direction is covered with a lower cover plate 76.
In the embodiment, the second left bank exhaust pipe 63 is constituted by the upstream pipe 77 and the downstream pipe 78, but may be constituted by a single pipe having no connection portion. Similarly, the second right bank exhaust pipe 64 is constituted by the two pipes 81 and 82, but may be constituted by a single pipe having no connection portion. Next, the structure of the gathering unit 70 will be described in detail with reference to FIG.

  As shown in FIG. 3, the collective portion 70 is a hollow member extending in the vehicle front-rear direction. In addition, the collecting portion 70 includes a first left connection port 86 to which the rear end 85 of the first left bank exhaust pipe 61 is connected, and a first right connection to which the rear end 87 of the first right bank exhaust pipe 62 is connected. It has a port 88 and a second connection port 91 to which the front end 89 of the relay exhaust pipe 66 is connected. That is, the exhaust port of the front bank cylinder (FIG. 2, reference numeral 21) and the first connection ports 86, 88 are connected by the two first bank exhaust pipes 61, 62, and the rear bank cylinder (FIG. 2, reference numeral). 22) and the second connection port 91 are connected by two second bank exhaust pipes 63 and 64, a second collecting member 65, and a relay exhaust pipe 66.

  In addition, the first left connection port 86 and the first right connection port 88 are disposed at the front portion in the vehicle front-rear direction of the collective portion 70, and the second connection port 91 is disposed at the vehicle width direction right side portion of the collective portion 70. Yes. Note that a flat plate portion 92 (described later) in which two plates are stacked is provided between the first left connection port 86 and the first right connection port 88.

  The collective portion 70 is formed of a plate member. Although the cross-sectional structure of the collective portion 70 will be described later, since the collective portion 70 is composed of an upper half and a lower half, the second connection port 91 is formed of an upper half and a lower half. If the gathering part is formed of one member without being divided into an upper half and a lower half, it is easy to open a connection port in the gathering part that is a plate-like member. The second connection port can be easily provided.

  In addition, a rectifying unit 100 (described in detail later) is provided inside the collecting unit 70. The rectifying unit 100 includes a front rectifying plate 101 (described later in detail) disposed downstream of the first left connection port 86 and the first right connection port 88 and a rear rectification disposed downstream of the second connection port 91. It consists of a plate 102 (described later in detail).

  The holes 103 and 104 are plug welding holes provided in the collecting portion 70 in order to weld the front current plate 101 to the collecting portion 70. Further, the holes 105 and 106 are plug welding holes provided in the collective portion 70 in order to weld the rear current plate 102 to the collective portion 70.

Further, the two first bank exhaust pipes 61 and 62 are assembled in front of the front rectifying plate 101.
The rear end 85 of the first left bank exhaust pipe 61 and the rear end 87 of the first right bank exhaust pipe 62 may be extended to the vicinity of the front rectifying plate 101. Next, the assembly structure of the second left bank exhaust pipe 63 and the second right bank exhaust pipe 64 will be described with reference to FIG.

  As shown in FIG. 4, the second assembly member 65 includes a second assembly rear connection port 113 to which the front end 111 of the second left bank exhaust pipe 63 and the front end 112 of the second right bank exhaust pipe 64 are connected, And a second pre-collection connection port 115 to which the rear end 114 of the relay exhaust pipe 66 is connected. Since the second left bank exhaust pipe 63 and the second right bank exhaust pipe 64 are arranged in the front-rear direction of the vehicle, the vehicle around the second assembly member 65 is compared with the case where the two exhaust pipes are arranged in the vehicle width direction. The protrusion in the width direction can be reduced.

  In addition, since the second left bank exhaust pipe 63 and the second right bank exhaust pipe 64 are connected by the connecting plate 116, the rigidity of the two exhaust pipes 63 and 64 is improved.

  The exhaust gas that has passed through the second left bank exhaust pipe 63 and the exhaust gas that has passed through the second right bank exhaust pipe 64 are collected by the second collecting member 65, pass through the relay exhaust pipe 66, and the collecting portion (FIG. 3, It flows into the inside of the reference numeral 70).

  In the embodiment, the second left bank exhaust pipe 63 and the second right bank exhaust pipe 64 are gathered by a second gathering member 65, and the gathering portion (see FIG. 3) from the second gathering member 65 via the relay exhaust pipe 66. , 70), the two second bank exhaust pipes 63 and 64 may be directly connected to the collecting portion. Next, a cross-sectional structure in the vehicle width direction of the collecting portion 70 will be described with reference to FIG.

  As shown in FIG. 5, the gathering portion 70 is a hollow member formed by combining an upper half body 121 and a lower half body 122. The upper half 121 and the lower half 122 are plate-like members. The upper half 121 has an arc portion 123 that is arranged at the center and curves downward, an arc portion 124 that extends to the left from the arc portion 123 and curves upward, and the arc portion 124. An upper left flange 125 extending from the arc portion 123 to the lower left, an arc portion 126 extending rightward from the arc portion 123 and curving upward, and an upper right flange 127 extending from the arc portion 126 to the lower right. Consists of.

  In addition, the lower half 122 includes an arc portion 128 that is arranged in the center and curves upward, an arc portion 129 that extends leftward from the arc portion 128 and curves downward, and A lower left flange 131 that extends from the arc portion 129 to the upper left, an arc portion 132 that extends from the arc portion 128 to the right and curves downward, and a lower side that extends from the arc portion 132 to the upper right. And a right flange 133.

  The assembly portion 70 sandwiches the front rectifying plate 101 and the rear rectifying plate 102 between the upper half 121 of the plate member and the lower half 122 of the plate member, and welds the upper left flange 125 and the lower left flange 131, The upper right flange 127 and the lower right flange 133 are welded. That is, the aggregate portion 70 is formed by welding two plate-like members. Since the hollow collecting portion 70 is divided into upper and lower portions, the front rectifying plate 101 and the rear rectifying plate 102 can be easily provided inside the collecting portion 70.

  If a hollow collective part is cut from a solid member, the manufacturing cost of the collective part increases because of the number of cutting steps. In that respect, in the present invention, since the upper half body 121 of the plate member and the lower half body 122 of the plate member are combined to form the hollow gathering portion 70, the gathering portion 70 can be manufactured at low cost.

  In the embodiment, the gathering portion 70 is formed by welding two plate-like members (upper half body 121 and lower half body 122), but the upper half body 121 is composed of a plurality of plate-like members, The half body 122 may be composed of a plurality of plate-like members. That is, a structure in which a plurality of plate-like members are formed by welding in addition to the above structure may be applied to the aggregate portion 70.

  In addition, the front rectifying plate 101 is formed in a C-shaped cross section and is in close contact with the inner surface 134 of the arc portion 124 and the inner surface 135 of the arc portion 129. Further, the rear current plate 102 is formed in a C-shaped cross section and is in close contact with the inner surface 136 of the arc portion 126 and the inner surface 137 of the arc portion 132. Since the front rectifying plate 101 and the rear rectifying plate 102 are in close contact with the inner surfaces 134 and 136 of the upper half 121 and the inner surfaces 135 and 137 of the lower half 122, when the exhaust gas passes, It is possible to prevent the side rectifying plate 102 from moving.

  Further, since the front rectifying plate 101 and the rear rectifying plate 102 are attached between the upper half body 121 and the lower half body 122, the function as a reinforcing member that contributes to improving the rigidity of the collective portion 70 is also exhibited. Next, a cross-sectional structure of the gathering portion 70 in the vehicle front-rear direction will be described with reference to FIG.

  As shown in FIG. 6, a mounting seat 138 is provided on the upper half body 121 of the collecting unit 70 at a position behind the rectifying unit 100 and a position ahead of the connection member 71. An oxygen sensor 140 for measuring the oxygen concentration of the exhaust gas flowing inside the collecting portion 70 is attached to the attachment seat 138.

  In addition, the case 141 is sandwiched between the upper half 121 and the lower half 122 on the rear side of the gathering portion 70. Inside the case 141, a catalyst 150 for purifying exhaust gas flowing inside the collecting portion 70 is provided. That is, the oxygen sensor 140 is attached to the gathering unit 70 so as to be disposed between the rectifying unit 100 and the catalyst 150. Further, the catalyst 150 disposed downstream of the rectifying unit 100 is accommodated in the collecting unit 70.

  That is, the assembly portion 70 is a hollow member and also serves as a catalyst storage portion. Since the catalyst storage portion is provided in the collecting portion 70, it is not necessary to prepare a separate catalyst tube, and the number of components constituting the exhaust device 60A can be reduced.

  Further, the case 141 is in close contact with the recess 151 of the upper half 121 and the recess 152 of the lower half 122, and is in close contact with the upper half 121 and the lower half 122 via the tubular member 153. Yes. When the case 141 is in close contact with the upper half 121 and the lower half 122, the catalyst 150 is securely attached to the assembly portion 70.

  The flat plate portion 92 is a portion provided at the front portion of the collective portion 70 in the vehicle front-rear direction. The flat plate portion 92 includes an upper flat plate 154 of the upper half body 121 and a lower flat plate 155 of the lower half body 122. By providing the flat plate portion 92 in the collective portion 70, two connection ports (FIG. 3, reference numerals 86 and 88) can be provided in the front portion of the collective portion 70. Next, functions of the gathering unit 70 and the rectifying unit 100 will be described with reference to FIG.

  As shown in FIG. 7, the gathering portion 70 is connected to the first left flow path 161 that is substantially orthogonal to the front rectifying plate 101 and continues to the first left connection port (reference numeral 86 in FIG. 3), and the front rectifying plate 101. A first right channel 162 that is substantially parallel and continues to the first right connection port (FIG. 3, reference numeral 88), and a second channel 163 that continues to the second connection port (FIG. 3, reference numeral 91). Prepare.

In addition, the rear rectifying plate 102 has a function of bending the flow of the exhaust gas flowing in from the second connection port by approximately 90 °.
Further, the front rectifying plate 101 is provided downstream of the first left connection port and the first right connection port, and has a function of allowing exhaust gas to flow in a predetermined direction separately from the rear rectifying plate 102. The predetermined direction refers to a direction downstream from the rectifying unit 100. A front rectifying plate 101 is provided upstream of the rear rectifying plate 102, and the front rectifying plate 101 and the rear rectifying plate 102 are adjacent to each other.

  The exhaust gas exhausted from the front bank cylinder (FIG. 2, reference numeral 21) flows along the front rectifying plate 101, and the exhaust gas exhausted from the rear bank cylinder (FIG. 2, reference numeral 22) is the rear rectifying plate. Flows along 102. That is, the exhaust gas from the front bank cylinder can be flowed in a predetermined direction by the front rectifying plate 101 without being affected by the rear rectifying plate 102.

  The exhaust gas that has passed through the first left flow path 161 hits the front rectifying plate 101 and then flows along the front rectifying plate 101 toward the catalyst (FIG. 6, reference numeral 150). That is, the first left bank exhaust pipe (FIG. 3, reference numeral 61) is configured such that exhaust gas passing through the inside flows perpendicularly to the front rectifying plate 101.

  Furthermore, the rear end (FIG. 3, reference numeral 85) of the first left bank exhaust pipe (FIG. 3, reference numeral 85) and the rear end (FIG. 3, reference numeral 87) of the first right bank exhaust pipe (FIG. 3, reference numeral 62) are Therefore, the exhaust gas that has passed through the two first bank exhaust pipes (FIG. 3, reference numerals 61 and 62) can easily flow along the front rectifying plate 101. Therefore, the exhaust gas that has passed through the two first bank exhaust pipes is more reliably rectified.

  In addition, although the 2nd connection port (FIG. 3, code | symbol 91) was arrange | positioned in the vehicle width direction right side part of the collection part 70 in the Example, you may arrange | position to the vehicle width direction left side part of the collection part 70. When the second connection port is disposed on the left side in the vehicle width direction of the collecting portion 70, the rear current plate 102 is disposed on the left side in the vehicle width direction. Further, the front rectifying plate 101 is arranged so as to be orthogonal to the first right connection port (FIG. 3, symbol 88), so that the first right bank exhaust pipe (FIG. 3, symbol 62) passes through the inside. You may comprise so that gas may flow orthogonally with the front side baffle plate 101. FIG.

The operation of the exhaust device 60A described above will be described next.
As shown in FIG. 8, the exhaust gas that has passed through the first left bank exhaust pipe 61 and the first left flow passage 161 as indicated by arrow (1) hits the front rectifying plate 101 and then moves along the front rectifying plate 101. It goes downstream as shown in (2).

The exhaust gas that has passed through the first right bank exhaust pipe 62 and the first right flow path 162 as indicated by an arrow (3) is directed downstream along the front rectifying plate 101 as indicated by an arrow (4).
The exhaust gas that has passed through the relay exhaust pipe 66 and the second flow path 163 as indicated by the arrow (5) is directed downstream as indicated by the arrow (6) along the rear rectifying plate 102.

  Part of the exhaust gas that has passed along the front rectifying plate 101 and the rear rectifying plate 102 hits the oxygen sensor 140 and diffuses as indicated by an arrow (7). The diffused exhaust gas is directed toward the catalyst 150 as indicated by an arrow (8).

  When a part of the exhaust gas that has passed along the front side rectifying plate 101 and the rear side rectifying plate 102 hits the oxygen sensor 140, a part of the hit exhaust gas flow diffuses immediately before the catalyst 150. Therefore, the exhaust gas can be allowed to flow evenly on the front surface 157 of the catalyst 150.

  The exhaust system described so far has been applied to a V-type four-cylinder engine, but depending on the vehicle, the engine displacement may be smaller. An example of an exhaust system applied to a V-type two-cylinder engine with a smaller displacement will be described below.

  FIG. 9 is a diagram showing a modified example of FIG. The main change is that in order to apply the V-type two-cylinder engine, the first bank exhaust pipe is made one, the second bank exhaust pipe is made one, and the rectification unit is composed only of the rear rectifying plate.

  In the exhaust device 60B, the first bank exhaust pipe 171 is an exhaust pipe extending from the exhaust port of the first bank cylinder of the V-type two-cylinder engine. The second bank exhaust pipe 172 is an exhaust pipe extending from the exhaust port of the second bank cylinder.

  In addition, the collecting portion 173 has a first connection port 175 to which the rear end 174 of the first bank exhaust pipe 171 is connected. The first connection port 175 is disposed at the front portion of the collective portion 173 in the vehicle front-rear direction.

  Further, the collecting portion 173 has a second connection port 177 to which the front end 176 of the second bank exhaust pipe 172 is connected. The second connection port 177 is disposed on the right side of the collective portion 173 in the vehicle width direction. In addition, although the 2nd connection port 177 was arrange | positioned in the vehicle width direction right side part of the gathering part 173 in the Example, you may arrange | position to the vehicle width direction left side part of the gathering part 173.

  A rectifying unit that bends the flow of the exhaust gas flowing in from the second connection port 177 by approximately 90 ° is provided inside the collecting unit 173. The rectifying unit is the rear rectifying plate 102 provided downstream of the second connection port 177. That is, the flow of exhaust gas can be bent by approximately 90 ° at the rear rectifying plate 102.

  In addition to bending the exhaust gas flow from the second connection port 177, the rear rectifying plate 102 also exhibits the rectification action of the exhaust gas flowing from the first connection port 175. That is, the exhaust gas from the first connection port 175 flows along the central side surface 179 of the rear rectifying plate 102.

The rear rectifying plate 102 is provided downstream of the second connection port 177 in the embodiment. However, the rear rectifying plate 102 is provided downstream of the first connection port 175 so that the flow of the exhaust gas flowing in from the first connection port 175 is approximately 90 °. It may be bent.
Moreover, although the rectification | straightening part was comprised only with the rear side rectifying plate 102, in addition to the rear side rectifying plate 102, you may provide a front side rectifying plate downstream of the 1st connection port 175.

  In the exhaust device 60B, the collective portion 173 is formed by welding a plurality of plate-like members. For example, when two plate-like members are welded to form the collective portion 173, the number of parts in the collective portion can be reduced as compared to the case where the plate-like members are joined together with fastening parts such as bolts and nuts. By reducing the number of parts, the manufacturing cost of the collecting portion 173 is reduced, so that the cost of the exhaust device 60B can be suppressed.

In addition, a rear rectifying plate 102 that is a rectifying unit is provided inside the collecting unit 173. In the present invention, since the rectifying unit is provided in the collecting unit 173, the overall size of the exhaust device 60B is reduced. By reducing the size of the exhaust device 60B, the degree of freedom in arrangement can be increased.
Therefore, according to the present invention, it is possible to provide an exhaust device 60B of a motorcycle (FIG. 1, reference numeral 10) that can be inexpensive and can increase the degree of freedom of arrangement.

  Further, the exhaust device 60 </ b> B includes a first bank exhaust pipe 171, a second bank exhaust pipe 172, and a collecting portion 173. The collective portion 173 has a first connection port 175 and a second connection port 177. That is, since the exhaust gas can flow along the collecting portion 173 after flowing into the collecting portion 173 through the first bank exhaust pipe 171 and the second bank exhaust pipe 172, the engine output is maintained. can do.

  Although the saddle-ride type vehicle according to the present invention is applied to a motorcycle in the embodiment, it can also be applied to a tricycle such as a buggy.

  The exhaust device of the present invention is suitable for a motorcycle.

  DESCRIPTION OF SYMBOLS 10 ... saddle riding type vehicle, 20 ... V type engine, 21 ... front side bank cylinder, 22 ... rear side bank cylinder, 60A, 60B ... exhaust device, 61, 62, 171 ... first bank exhaust pipe, 70, 173 ... set , 86, 88, 175 ... 1st connection port, 91, 177 ... 2nd connection port, 100 ... Rectification part, 101 ... Front side rectification plate, 102 ... Rear side rectification plate, 121 ... Upper half body, 122 ... Lower half Body, 140 ... oxygen sensor, 150 ... catalyst, 172 ... second bank exhaust pipe, 174, 176 ... tip.

Claims (6)

A first bank exhaust pipe (171) extending from the first bank cylinder of the V-type engine (20), a second bank exhaust pipe (172) extending from the second bank cylinder of the V-type engine (20), and the first A saddle-ride type vehicle exhaust system comprising: a tip (174) of a bank exhaust pipe (171) and a gathering part (173) where the tip (176) of the second bank exhaust pipe (172) gathers;
The collective portion (173) is formed by welding a plurality of plate-like members, and the first connection port (175) to which the tip (174) of the first bank exhaust pipe (171) is connected and the first A second connection port (177) to which the tip (176) of the two bank exhaust pipe (172) is connected;
A rectifying portion that bends the flow of exhaust gas flowing in from at least one of the first connection port (175) and the second connection port (177) by approximately 90 ° is provided inside the collecting portion (173). An exhaust device for a saddle-ride type vehicle. The first bank cylinder is a front bank cylinder (21) disposed on the front side in the vehicle longitudinal direction of the V-type engine (20), and the second bank cylinder is a vehicle front-rear direction of the V-type engine (20). A rear bank cylinder (22) disposed on the rear side;
The first connection port (175) is disposed at the front portion of the collective portion (173) in the vehicle front-rear direction.
The second connection port (177) is disposed on a vehicle width direction side portion of the collective portion (173),
The exhaust system for a saddle-ride type vehicle according to claim 1, wherein the rectifying unit is a rear rectifying plate (102) provided downstream of the second connection port (177).   A front rectifying plate (101) that allows exhaust gas to flow in a predetermined direction is provided downstream of the first connection port (86, 88), in addition to the rear rectifying plate (102). The exhaust device for a saddle-ride type vehicle according to claim 2, wherein the rear current plate (102) is adjacent to each other. The V-type engine (20) is a total four-cylinder engine including the front bank cylinder (21) having two cylinders and the rear bank cylinder (22) having two cylinders,
The first connection port (86, 88) and the front bank cylinder (21) are connected by the two first bank exhaust pipes (61, 62), and the second connection port (91) and the rear bank cylinder (21). The side bank cylinder (22) is connected by the two second bank exhaust pipes, and the two first bank exhaust pipes (61, 62) are assembled in the vicinity of the front rectifying plate (101). ,
Of the two first bank exhaust pipes (61, 62), at least one of the exhaust pipes (61) is configured such that exhaust gas passing through the inside flows perpendicularly to the front rectifying plate (101). The exhaust device for a saddle-ride type vehicle according to claim 3, wherein The assembly part (70) is a hollow member formed by combining the upper half (121) and the lower half (122),
The exhaust system for a saddle-ride type vehicle according to claim 1, wherein the catalyst (150) disposed downstream of the rectifying unit (100) is accommodated in the hollow member.   The saddle riding type vehicle according to claim 5, wherein an oxygen sensor (140) is attached to the hollow member so as to be disposed between the rectifying unit (100) and the catalyst (150). Exhaust system.

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