JP2017160840A - Ride type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimize arrangement of a bypass valve in a V-type engine.SOLUTION: An air bypass valve 62 for opening and closing an air bypass passage 61 to release surplus pressure of a supercharger 42 generated in closing a throttle valve 57 and the like, to an upstream side of the supercharger 42, is disposed at an upper part of the supercharger 42 at a side part of an engine 31. The air bypass valve 62 is disposed at a high position near an intercooler out pipe 58 disposed between an intercooler 47 and a surge tank 63. The air bypass passage 61 is disposed between the intercooler out pipe 58 and an inlet pipe 45, and an upper end of the air bypass passage 61 is connected to the intercooler out pipe 58 at a position near the throttle valve 57.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a straddle-type vehicle including a V-type engine and a supercharger.

  By providing a supercharger in a straddle-type vehicle such as a motorcycle and supplying air compressed by the supercharger to the combustion chamber of the engine, the thermal efficiency of the engine can be increased and the output can be increased. Patent Documents 1 and 2 below describe a saddle-ride type vehicle equipped with a horizontal V-type engine having at least a pair of cylinders arranged at the front and the rear, respectively, provided with a supercharger. Yes.

  Further, in general, in a saddle-ride type vehicle provided with a supercharger, for example, when a throttle valve is closed, a downstream of the supercharger (specifically, a compressor unit that compresses air in the supercharger). A bypass passage that releases the compressed air on the side to the upstream side of the supercharger without passing through the supercharger and reduces the pressure between the supercharger and the throttle valve, and a bypass valve that opens and closes the bypass passage Provided.

  Specifically, in a saddle riding type vehicle, an air cleaner is connected to the upstream side of the supercharger, and an intercooler is connected to the downstream side of the supercharger, that is, between the supercharger and the throttle valve. . In such a saddle-ride type vehicle, the bypass passage is formed by connecting a part of the passage between the air cleaner and the supercharger and a part of the passage between the intercooler and the throttle valve by piping or the like. It is formed. Further, depending on the arrangement of the intercooler or the throttle valve in the saddle riding type vehicle, the bypass passage may be a part of the passage between the air cleaner and the supercharger and a part of the passage between the supercharger and the intercooler. May be formed by connecting them with a pipe or the like. On the other hand, the bypass valve is provided in the middle of the bypass passage or at one end of the bypass passage.

  Patent Document 3 below is a straddle-type vehicle equipped with a parallel two-cylinder engine instead of a V-type engine, and includes a supercharger, a bypass passage (air bypass hose), and a bypass valve (air bypass valve). A saddle type vehicle is described.

JP 60-17263 A JP 59-53229 A JP2015-78634A

  By the way, in the saddle riding type vehicle equipped with the supercharger, for example, there is a request as follows for determining the position where the bypass valve is provided.

  That is, in a vehicle equipped with a supercharger, when the bypass valve is opened, air flows from the downstream side to the upstream side of the supercharger through the bypass valve, thereby generating an air sound such as “push”. . This air sound is a unique sound of a vehicle equipped with a supercharger, and is one of the attractions of a vehicle equipped with a supercharger. It is desirable to determine the position of the bypass valve so that the driver can easily hear this air sound. In this regard, in the saddle-ride type vehicle described in Patent Document 3, the bypass valve is disposed at the lower part of the engine, and the bypass valve is far away from the head of the driver seated on the driving seat. Hard to hear.

  In addition, the bypass valve is a unique part of a vehicle equipped with a supercharger. By positively showing this to the user, the satisfaction of the user who owns the vehicle equipped with the supercharger can be enhanced. . For this reason, it is desirable to arrange the bypass valve at a position that is easy for the user to see. In this regard, in the saddle riding type vehicle described in Patent Document 3, the bypass valve is disposed at a position below the engine that is difficult for the user to see.

  Further, in order to protect the bypass valve from a stepping stone or water during traveling, it is desired to dispose the bypass valve at a position where the stepping stone from the ground is difficult to hit or water from the ground is difficult to be applied.

  Further, it is desirable that the bypass passage is short so that the compressed air on the downstream side of the supercharger can be quickly released to the upstream side. Further, in the passage between the air cleaner and the supercharger, the pressure difference between the portion near the suction port of the compressor portion of the supercharger and the downstream side of the supercharger is larger than other portions. Therefore, it is desirable to connect one end of the bypass passage to the vicinity of the suction port of the compressor portion of the supercharger in order to quickly release the compressed air downstream of the supercharger to the upstream side of the supercharger. In order to meet these two requirements, it is desirable to form a bypass passage in the vicinity of the supercharger and dispose the bypass valve near the supercharger.

  However, the V-type 2-cylinder or V-type 4-cylinder engine is more complex in shape than the upright single-cylinder, parallel 2-cylinder, or parallel 4-cylinder engine. It is not easy to determine the position where the valve is provided.

  The present invention has been made in view of the problems described above, for example, and an object of the present invention is to provide a straddle-type vehicle capable of optimizing the arrangement of bypass valves in a V-type engine.

  In order to solve the above-described problems, a saddle riding type vehicle according to the present invention includes a V-type engine having at least a pair of cylinders arranged in front and rear, an air cleaner for purifying air for fuel combustion, and purification by the air cleaner. A supercharger that compresses the compressed air; an intercooler that cools the air compressed by the supercharger; and a throttle valve that controls a flow rate of the air cooled by the intercooler to the V-type engine; A surge tank that temporarily stores the air cooled by the intercooler, a first air passage that connects the air cleaner and the supercharger, and a second air that connects the intercooler and the surge tank. A bypass passage connecting the second air passage and the first air passage without passing through the supercharger, and the bypass passage The supercharger is disposed on the side of the V-type engine, and the bypass valve is located in the front view of the straddle-type vehicle. It is the side where the said supercharger is arrange | positioned, and is arrange | positioned above the said supercharger in the side view of the said saddle riding type vehicle.

  According to this aspect of the present invention, since the bypass valve is disposed on the side of the V-type engine, there is less intervening between the driver's head seated on the driver's seat and the bypass valve. Moreover, since the bypass valve is disposed above the supercharger, the position of the bypass valve is increased, and the distance between the head of the driver seated on the driver's seat and the bypass valve is shortened. As a result, the driver can easily hear the unique air sound generated when the bypass valve is opened. Further, since the bypass valve is disposed on the side of the V-type engine and above the supercharger, the user can easily see the bypass valve. In addition, since the bypass valve is located on the side of the V-type engine and above the supercharger, it is difficult for stepping stones from the ground to hit the bypass valve, or water from the ground is less likely to hit the bypass valve. Become. Thereby, a bypass valve can be protected from a stepping stone or water. Further, since the bypass valve is disposed on the side of the V-type engine and on the same side as the side on which the supercharger is disposed, the bypass valve can be disposed near the supercharger. This makes it easy to shorten the bypass passage and connect one end of the bypass passage to the vicinity of the suction port of the compressor portion of the supercharger. By forming such a bypass passage, Side compressed air can be quickly released to the upstream side.

  In the saddle-ride type vehicle of the present invention described above, the surge tank is disposed above the V-type engine, the intercooler is disposed in front of the V-type engine, and the second air passage is the first air passage. The bypass passage extends vertically between the second air passage and the first air passage, and the bypass valve extends in the up-down direction in the first air passage. Preferably, the second air passage is disposed between the second air passage and the first air passage, and is closer to the second air passage than the first air passage.

  According to this aspect of the present invention, since the bypass valve is disposed at a position closer to the second air passage than the first air passage, the position of the bypass valve is high. As a result, the bypass valve approaches the driver's head seated on the driver's seat. Therefore, it is possible to enhance the effect of making it easier for the driver to hear the unique air sound generated when the bypass valve is opened, and to enhance the effect of allowing the user to easily see the bypass valve. Further, since the bypass valve is separated from the ground, it is possible to enhance the effect of protecting the bypass valve from a stepping stone or water from the ground.

  In the straddle-type vehicle of the present invention described above, the throttle valve is provided in the second air passage, and the bypass passage is connected to the upstream side of the throttle valve in the second air passage. It is preferable.

  According to this aspect of the present invention, when the throttle valve is closed, the compressed air flowing in the second air passage from the intercooler toward the throttle valve is supplied to the upstream side of the supercharger via the bypass passage. It is possible to escape to one air passage. In particular, of the air flow path from the supercharger to the throttle valve via the intercooler and the second air passage, the upstream portion of the throttle valve in the second air passage is the position when the throttle valve is closed. Since the air pressure is higher than the other parts, connecting the bypass passage to this part allows the compressed air on the downstream side of the turbocharger to quickly escape to the upstream side of the supercharger. The pressure on the downstream side of the supercharger can be quickly reduced.

  In the above-described second air passage of the saddle-ride type vehicle according to the present invention, the passage length between the connection position of the bypass passage and the second air passage and the slot valve is the connection position. It is preferable that the length of the passage between the intercooler is shorter.

  In this aspect of the invention, the bypass passage is connected to a position close to the throttle valve. Of the upstream side portion of the throttle valve in the second air passage, the portion close to the throttle valve is a portion where the air pressure when the throttle valve is closed is higher than the other portions. By connecting the bypass passage to the turbocharger, it is possible to increase the effect of quickly releasing the compressed air downstream of the turbocharger to the upstream side of the supercharger, and thus the effect of rapidly reducing the pressure downstream of the turbocharger. Can be increased.

  In the straddle-type vehicle of the present invention described above, at least a part of the second air passage is disposed on one side of the straddle-type vehicle in which the supercharger is disposed. Is preferred.

  According to this aspect of the present invention, at least a part of the second air passage and the supercharger can be brought close to each other. Therefore, one end of the bypass passage is connected to a portion of the second air passage that is close to the supercharger, and the other end of the bypass passage is connected to the suction port of the compressor portion of the supercharger in the first air passage. By connecting to a portion close to, the bypass passage can be shortened. As a result, the effect of quickly letting the compressed air on the downstream side of the supercharger escape to the upstream side of the supercharger can be enhanced.

  According to the present invention, the arrangement of the bypass valve in the V-type engine can be optimized, and thereby, for example, a unique air sound generated when the bypass valve is opened can be easily heard by the driver. The bypass valve can be easily seen, the bypass valve can be protected from stepping stones or water, etc., and the compressed air downstream of the turbocharger can be quickly released upstream .

It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by embodiment of this invention from the right. It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by embodiment of this invention from the left. It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by embodiment of this invention from the top. 1 is an explanatory diagram showing an engine, a supercharger, an intercooler, a surge tank, a radiator, and the like in a straddle-type vehicle according to an embodiment of the present invention. It is explanatory drawing which shows an engine, a supercharger, an intercooler, a surge tank, a radiator, etc. seen from the arrow VV direction in FIG. In the saddle riding type vehicle according to the embodiment of the present invention, it is an explanatory view showing the arrangement of an air cleaner, a supercharger, an intercooler, a surge tank, a fuel tank and a silencer. In the saddle riding type vehicle according to the embodiment of the present invention, it is an explanatory diagram showing an air cleaner, a supercharger, and an inlet pipe connecting between the two. It is explanatory drawing which shows the intercooler in the saddle riding type vehicle by embodiment of this invention. In a saddle riding type vehicle according to an embodiment of the present invention, it is an explanatory diagram showing a supercharger, an intercooler, and an outlet pipe connecting the two. In the saddle riding type vehicle according to the embodiment of the present invention, it is an explanatory diagram showing an intercooler, a surge tank, and an intercooler out pipe, a throttle mechanism, and a connecting pipe provided therebetween. In a saddle-ride type vehicle according to an embodiment of the present invention, it is an explanatory diagram showing an air bypass passage, an air bypass valve, and their peripheral regions. It is explanatory drawing which shows the air bypass passage seen from the arrow XII-XII direction in FIG. 11, an air bypass valve, and those peripheral regions. It is explanatory drawing which shows the air bypass channel | path, the air bypass valve, and those peripheral area | regions seen from the arrow XIII-XIII direction in FIG.

  1 to 3 show a straddle-type vehicle according to an embodiment of the present invention. Specifically, FIG. 1 is a view of a saddle riding type vehicle according to an embodiment of the present invention as viewed from the right, FIG. 2 is a view of the saddle riding type vehicle as viewed from the left, and FIG. It is the figure which looked at the riding type vehicle from the top. In the following description of the embodiments, the front, rear, left, right, up, and down directions are based on the driver seated on the driving seat of the saddle riding type vehicle.

  As shown in FIG. 1, a straddle-type vehicle 1 according to an embodiment of the present invention is, for example, a motorcycle. The body frame 2 of the saddle riding type vehicle 1 includes a head pipe 3, a pair of main frames 4, a pair of down tubes 5, and a pair of pivot frames 6. The head pipe 3 is disposed at the front and upper part of the saddle riding type vehicle 1. As shown in FIG. 3, the pair of main frames 4 extends rearward while expanding from the head pipe 3 to the left and right. As shown in FIGS. 1 and 2, the pair of down tubes 5 extends downward while tilting backward from the head pipe 3, then curves, and then extends backward substantially in the horizontal direction. Here, S in FIGS. 3, 7, 9, and 10 indicates a reference line that penetrates in the front-rear direction just in the middle of the straddle-type vehicle 1 in the left-right direction. As shown in FIG. 7, the pair of down tubes 5 are located on the left side and the right side of the reference line S, spaced apart from each other by a predetermined distance, and arranged in parallel to each other. Each pivot frame 6 extends vertically between the rear end portion of the main frame 4 and the rear end portion of the down tube 5 as shown in FIGS. 1 and 2. Although not shown, the vehicle body frame 2 includes a seat rail that extends rearward from the rear end side of each main frame 4, and a bridge that connects the main frames 4, the down tubes 5, and the pivot frames 6. It has a frame.

  As shown in FIG. 1, a steering shaft (not shown) is inserted into the head pipe 3 of the vehicle body frame 2, and the upper end side of the front fork 11 is supported on the steering shaft via a bracket. A front wheel 12 is supported on the lower end side of the wheel. The steering shaft is provided with a handle 13 via a bracket. On the other hand, the pivot frame 6 supports the front end side of the swing arm 15, and the rear wheel 16 is supported on the rear end side of the swing arm 15. An engine 31 is provided in a space located between the front wheel 12 and the rear wheel 16 and surrounded by the pair of main frames 4, the pair of down tubes 5, and the pair of pivot frames 6. The engine 31 is fixed to each main frame 4 and each down tube 5 through an engine mount. Further, an operation seat 18 on which a driver is seated is provided behind and above the engine 31, and a fuel tank 17 is provided below the operation seat 18. Further, a silencer 20 for reducing exhaust noise is provided behind the operation seat 18. Further, as shown in FIG. 3, a pair of left and right steps 19 on which the driver puts his / her foot is provided at the lower rear of the engine 31.

  4 is a view of the engine 31, the supercharger 42, the intercooler 47, the surge tank 63, the radiator 46, and the like provided in the saddle riding type vehicle 1 as viewed from the right. FIG. It is the figure seen from the arrow VV direction. FIG. 6 is a view of the air cleaner 41, the supercharger 42, the intercooler 47, the surge tank 63, the fuel tank 17 and the silencer 20 provided in the saddle riding type vehicle 1 from above.

  As shown in FIG. 4, the engine 31 is a horizontal V-type two-cylinder engine having a pair of cylinders arranged at the front and rear. That is, the engine 31 includes a crankcase 32, a front cylinder 33 disposed on the upper front side of the crankcase 32, and a rear cylinder 35 disposed on the upper rear side of the crankcase 32. The front cylinder 33 is inclined forward, and a cylinder head 34 is provided on the top of the front cylinder 33. Further, the rear cylinder 35 is inclined rearward, and a cylinder head 36 is provided on the upper portion of the rear cylinder 35.

  An oil pan 37 is provided at the bottom of the crankcase 32 as an oil reservoir that stores engine oil. The saddle riding type vehicle 1 employs a wet sump system in which engine oil is stored in an oil pan 37 provided on the bottom side of the crankcase 32, pumped up by a pump, and pumped to each part of the engine 31. ing.

  When the engine 31 is in an ideal state (for example, immediately after the engine oil storage amount is adjusted by maintenance), a predetermined amount of engine oil is stored in the oil pan 37. L in FIG. 4 indicates the position of the oil level of the engine oil, that is, the oil level in a state where a predetermined amount of engine oil is stored in the oil pan 37 in the ideal state. Oil level L is higher than the bottom surface of oil pan 37 and lower than axis X of the crankshaft of engine 31.

  Further, as shown in FIG. 5 or 6, the saddle riding type vehicle 1 is provided with an air cleaner 41 for purifying air for fuel combustion. The air cleaner 41 is disposed on the left side of the engine 31. Although detailed illustration is omitted, the air cleaner 41 is configured by disposing an air filter in the cleaner case. The air cleaner 41 purifies the air by sucking outside air into the cleaner case from an inlet formed at, for example, the front or the left of the cleaner case, and passing the sucked air through an air filter. It discharges from the discharge port 41A formed in the right part.

  Further, as shown in FIG. 4, the saddle riding type vehicle 1 is provided with a supercharger 42 that compresses the air purified by the air cleaner 41. The supercharger 42 includes a compressor unit 43 that compresses the air purified by the air cleaner 41 and a turbine unit 44 that drives the compressor unit 43.

  The supercharger 42 is disposed on the right side of the engine 31. Further, the supercharger 42 is disposed at a position overlapping the front cylinder 33 in a side view of the saddle riding type vehicle 1. Further, the supercharger 42 is disposed at a position higher than the oil level L. The supercharger 42 is arranged at a position higher than the axis X of the crankshaft.

  Since the supercharger 42 is arranged on the side of the engine 31, for example, a conventional saddle type in which the supercharger is arranged in front of the engine as shown in FIG. Compared with the vehicle, a stepping stone or the like wound by the front wheel 12 during traveling is less likely to hit the supercharger 42. Therefore, the supercharger 42 can be protected from stepping stones and the like. Further, since the supercharger 42 is disposed on the side of the engine 31, the straddle-type vehicle 1 is moved forward and backward as compared with a conventional straddle-type vehicle in which the supercharger is disposed in front of or behind the engine. Can be made smaller in the direction.

  Further, since the supercharger 42 is disposed at a position overlapping the front cylinder 33 in a side view of the saddle riding type vehicle 1, for example, as shown in FIG. Compared to a conventional saddle-ride type vehicle in which the aircraft is arranged behind the engine, a long distance is secured between the driver's feet seated on the driver's seat 18 and the supercharger 42. 42 is far from each step 19. Since the turbine section 44 of the supercharger 42 rotates the turbine wheel using the exhaust of the engine 31, it becomes high temperature due to the heat of the exhaust. Moreover, since the compressor part 43 of the supercharger 42 compresses air, it becomes high temperature. By increasing the distance between the supercharger 42 and the driver's foot, high-temperature heat generated from the supercharger 42 can be prevented from being transmitted to the driver's foot, and the driver can be protected. .

  Further, since the supercharger 42 is disposed at a position higher than the oil level L, the engine oil supplied to the supercharger 42 can be returned to the oil pan 37 by free fall. That is, the supercharger 42 includes a bearing for rotating a turbine wheel provided in the turbine unit 44 and rotating a compressor impeller provided in the compressor unit 43. In order to lubricate or cool the bearings of the supercharger 42, the saddle riding type vehicle 1 pumps up engine oil stored in the oil pan 37 with a pump, and not only the parts of the engine 31 but also the supercharger 42. It has a mechanism to supply the bearings. Since the supercharger 42 is disposed at a position higher than the oil level L of the engine oil stored in the oil pan 37, the engine oil supplied to the bearing of the supercharger 42 is dropped into the oil pan 37 by gravity. be able to. Therefore, it is not necessary to separately provide a pump for recovering the engine oil supplied to the supercharger 42. Therefore, the number of parts of the saddle riding type vehicle 1 can be reduced, and the manufacturing cost can be reduced. Weight reduction can be achieved.

  Further, as shown in FIG. 5 and FIG. 6, the supercharger 42 and the air cleaner 41 are respectively disposed on both sides in the left-right direction of the engine 31, so that the left-right weight balance of the saddle riding type vehicle 1 can be easily obtained. be able to. Further, since the supercharger 42 and the air cleaner 41 are respectively disposed on both sides of the engine 31 in the left-right direction, the supercharger 42 and the air cleaner 41 are appropriately separated. Therefore, it is possible to suppress the heat generated from the supercharger 42 from being transmitted to the air cleaner 41.

  In addition, an inlet pipe 45 is provided between the air cleaner 41 and the supercharger 42 as a first air passage that sends the air purified by the air cleaner 41 to the compressor unit 43 of the supercharger 42. As shown in FIG. 6, the left end of the inlet pipe 45 is connected to the discharge port 41 </ b> A of the air cleaner 41, and the right end of the inlet pipe 45 is connected to the suction port 43 </ b> A of the compressor unit 43 of the supercharger 42. The inlet pipe 45 extends in the left-right direction, and is disposed in a space formed between the radiator 46 and the intercooler 47 as shown in FIG. Thereby, as shown in FIG. 4, the inlet pipe 45 does not protrude forward from the intercooler 47 or the radiator 46. Therefore, the saddle riding type vehicle 1 can be reduced in the front-rear direction. Moreover, the inlet piping 45 arrange | positioned between the radiator 46 and the intercooler 47 can be functioned as a heat insulation member. In other words, the heat generated from the intercooler 47 when the air that has been compressed by the supercharger 42 and becomes high temperature is cooled by the intercooler 47 can be prevented from being transmitted to the radiator 46 by the inlet pipe 45.

  Here, FIG. 7 shows details of the inlet pipe 45 that connects the air cleaner 41 and the supercharger 42. In the present embodiment, the inlet piping 45 includes a pipe 45A and a hose 45B. The left end of the pipe 45A is connected to the discharge port 41A of the air cleaner 41. The right end of the pipe 45A extends in a straight line almost horizontally to the right from the front side of the pair of left and right down tubes 5 and then exceeds the right down tube 5 It is curved at a certain position and then extends slightly backward. The hose 45B is a short linear hose, and connects the right end that opens rearward of the pipe 45A and the suction port 43A of the compressor unit 43 that opens forward.

  As shown in FIG. 4, in the saddle riding type vehicle 1, a radiator 46 that cools cooling water for cooling the engine 31 using wind or the like received during traveling, and a supercharger are disposed in front of the engine 31. There is provided an intercooler 47 that cools the air that has been compressed by the high temperature 42 using wind or the like received during traveling. The radiator 46 and the intercooler 47 are disposed on the front side of the pair of left and right down tubes 5 that are inclined rearward and extending in the vertical direction. In addition, the radiator 46 and the intercooler 47 are arranged side by side in the vertical direction so as to follow the portion of the pair of down tubes 5. In addition, the intercooler 47 is disposed above the radiator 46. Further, as shown in FIG. 5, both the radiator 46 and the intercooler 47 are arranged in the middle portion in the left-right direction of the saddle riding type vehicle 1. Since the intercooler 47 is disposed in front of the engine 31, wind during traveling can be easily applied to the intercooler 47, and the cooling effect by the intercooler 47 can be enhanced.

  Here, FIG. 8 shows the intercooler 47 arranged on the front side of the pair of down tubes 5. In FIG. 8, the core 48 of the intercooler 47 is provided with a plurality of air passages, and heat radiating fins are provided between the air passages. The illustration is omitted).

  A lower tube 49 that supplies air sent from the compressor unit 43 of the supercharger 42 to the core 48 is provided below the core 48. Further, the lower tube 49 is provided with a suction portion 50 that allows air from the compressor portion 43 to flow into the lower tube 49. The suction part 50 is disposed in the middle part in the left-right direction at the rear part of the lower tube 49, and projects backward through the down tubes 5. Further, the suction part 50 is opened rightward so that the connection with the compressor part 43 of the supercharger 42 arranged on the right side of the intercooler 47 is facilitated.

  Further, an upper tube 51 for discharging the air cooled through the core 48 to the throttle mechanism 55 (see FIG. 4) is provided on the upper side of the core 48. In addition, the upper tube 51 is provided with a discharge portion 52 that discharges air that has flowed out of the core 48 into the upper tube 51 to the throttle mechanism 55. The discharge part 52 is arranged on the right part of the upper tube 51. Further, the discharge unit 52 opens rearward so that connection with a throttle mechanism 55 disposed behind the intercooler 47 is easy.

  An outlet pipe 53 is provided between the supercharger 42 and the intercooler 47 to send the air compressed by the compressor unit 43 of the supercharger 42 to the lower tube 49 of the intercooler 47. FIG. 9 shows the details of the outlet pipe 53. As shown in FIG. 9, the right end of the outlet pipe 53 is connected to the discharge port 43 </ b> B of the compressor section 43 of the supercharger 42, and the left end of the outlet pipe 53 is the suction section provided in the lower tube 49 of the intercooler 47. 50. The outlet pipe 53 is formed by a hose, for example.

  Here, the supercharger 42 is located on the rear side of the portion extending in the vertical direction while tilting backward in the down tube 5 on the right side. The supercharger 42 is arranged so that the compressor unit 43 is located on the front side of the turbine unit 44. As a result, the compressor unit 43 is inclined upward and downward while tilting backward in the down tube 5 on the right side of the turbine unit 44. Close to the part extending in the direction. On the other hand, the intercooler 47 is disposed adjacent to the portion of the down tube 5 on the front side of the portion extending in the vertical direction while being inclined backward in the down tube 5. Further, as shown in FIG. 4, the intercooler 47 is disposed on the upper side of the radiator 46, so that the position of the lower tube 49 of the intercooler 47 in the vertical direction is the vertical direction of the compressor unit 43 of the supercharger 42. It almost coincides with the position of. As a result, the compressor unit 43 of the supercharger 42 and the lower tube 49 of the intercooler 47 are extremely close to each other. Therefore, the outlet pipe 53 connecting the two can be extremely shortened. By shortening the outlet pipe 53, the flow of air supplied to the engine 31 can be quickly controlled, and turbo lag can be suppressed. Moreover, since the short outlet piping 53 can be used, the saddle riding type vehicle 1 can be lightened.

  As shown in FIG. 4, in the saddle riding type vehicle 1, a surge tank 63 for temporarily storing the air cooled by the intercooler 47 is provided above the front cylinder 33 and the rear cylinder 35 of the engine 31. It has been. In the straddle-type vehicle 1 according to the present embodiment, the air cleaner 41 is disposed on the left side of the engine 31 and the fuel tank 17 is disposed on the upper rear side of the engine 31. Therefore, the front cylinder 33 and the rear cylinder 35 of the engine 31 are used. A large space can be formed above. Therefore, the large surge tank 63 can be disposed above the front cylinder 33 and the rear cylinder 35. In addition, in a conventional saddle-ride type vehicle, in order to place an air cleaner or a fuel tank together with a surge tank above the engine cylinder, the surge tank is matched to the case of the air cleaner or the shape of the fuel tank. In some cases, it was formed in a complicated shape. On the other hand, in the saddle riding type vehicle 1 according to the present embodiment, the air cleaner 41 and the fuel tank 17 are arranged at locations other than above the front cylinder 33 or the rear cylinder 35 of the engine 31, and therefore, the surge tank 63. Is disposed above the front cylinder 33 and the rear cylinder 35 of the engine 31, the shape of the surge tank 63 may not be complicated. Therefore, the shape of the surge tank 63 can be a simple box shape. As described above, according to the saddle riding type vehicle 1 according to the present embodiment, the surge tank 63 having a large and simple shape can be provided, so that the air rectification effect by the surge tank 63 can be enhanced. The pressure (supercharging pressure or boost pressure) of the air supplied to the front cylinder 33 and the rear cylinder 35 can be stabilized.

  Further, a passage (second air passage) for sending the air cooled by the intercooler 47 to the surge tank 63 is formed between the intercooler 47 and the surge tank 63. The passage is located above the front cylinder 33 of the engine 31. A throttle mechanism 55 that controls the flow rate of the air cooled by the intercooler 47 to the engine 31 is provided in the middle of the passage.

  FIG. 10 shows details of a passage connecting the intercooler 47 and the surge tank 63. As shown in FIG. 10, the passage includes an intercooler out pipe 58, a throttle mechanism 55, and a connecting pipe 64.

  The throttle mechanism 55 includes a throttle body 56. The throttle body 56 is formed in a substantially cylindrical shape, and a throttle valve 57 is provided inside the throttle body 56.

  The intercooler out pipe 58 is a pipe that connects the intercooler 47 and the throttle mechanism 55. The intercooler out pipe 58 is formed of, for example, a pipe. The front end of the intercooler out pipe 58 is connected to a discharge portion 52 provided in the upper tube 51 of the intercooler 47, and the rear end of the intercooler out pipe 58 is upstream of the throttle valve 57 in the throttle body 56. Connected to the opening located.

  The connecting pipe 64 is a pipe that connects the throttle mechanism 55 and the surge tank 63. The connecting pipe 64 is formed by a hose, for example. The front end of the connecting pipe 64 is connected to an opening located downstream of the throttle valve 57 in the throttle body 56, and the rear end of the connecting pipe 64 is connected to an inlet 63 </ b> A provided at the front end of the surge tank 63. It is connected.

  Here, in the saddle riding type vehicle 1, the intercooler 47 and the surge tank 63 are disposed at positions close to each other. That is, as shown in FIG. 4, the intercooler 47 is disposed in front of the engine 31 and above the radiator 46. The surge tank 63 is disposed above the front cylinder 33 and the rear cylinder 35 of the engine 31. As a result, the upper tube 51 of the intercooler 47 is at a height position substantially equal to the surge tank 63. Therefore, the passage between the intercooler 47 and the surge tank 63 can be shortened. Therefore, turbo lag can be suppressed.

  In addition, as shown in FIG. 10, in a top view of the saddle riding type vehicle 1, a discharge part 52 provided in the upper tube 51 of the intercooler 47 is disposed on the right outer side of the saddle riding type vehicle 1. The suction port 63 </ b> A is disposed at the middle portion in the left-right direction of the saddle riding type vehicle 1. The passage connecting the discharge portion 52 and the suction port 63A is relative to the reference line S so that the rear end side is inclined leftward from the right outer side of the saddle riding type vehicle 1 toward the middle portion in the left-right direction. It extends diagonally.

  Specifically, the front end of the intercooler out pipe 58 connected to the discharge portion 52 provided in the upper tube 51 of the intercooler 47 is located on the right side of the right down tube 5. In addition, the rear end side of the intercooler out pipe 58 slightly extends backward from the position on the right side of the right down tube 5, then curves, and then extends to the left rear side. However, the rear end of the intercooler out pipe 58 is located on the right side of the reference line S. Further, the throttle body 56 connected to the rear end of the intercooler out pipe 58 is entirely located on the right side of the reference line S, and linearly extends to the left rear from the front end to the rear end. . Further, the connecting pipe 64 connected to the rear end of the throttle body 56 extends linearly from the front end to the rear end leftward and rearward. Further, the suction port 63A of the surge tank 63 opens to the front right. Thereby, the connecting pipe 64 is connected to the suction port 63A without being bent.

  In addition, as shown in FIG. 4, the saddle riding type vehicle 1 is configured to release excess pressure between the compressor unit 43 and the throttle valve 57 to the upstream side of the compressor unit 43 when the throttle valve 57 is closed, for example. An air bypass passage 61 and an air bypass valve 62 are provided. The air bypass passage 61 is a specific example of the bypass passage, and the air bypass valve 62 is a specific example of the bypass valve.

  FIG. 11 shows the air bypass passage 61, the air bypass valve 62, and their peripheral regions. FIG. 12 shows the air bypass passage 61, the air bypass valve 62, and their peripheral regions as seen from the direction of arrows XII-XII in FIG. FIG. 13 shows the air bypass passage 61, the air bypass valve 62, and their peripheral regions as seen from the direction of arrows XIII-XIII in FIG.

  As shown in FIG. 11, the air bypass passage 61 is a passage that connects the intercooler out pipe 58 and the inlet pipe 45 without going through the compressor portion 43 of the supercharger 42. The air bypass valve 62 is a valve that opens and closes the air bypass passage 61. The air bypass valve 62 is, for example, an electromagnetic valve, and the opening and closing of the air bypass valve 62 is controlled by a control signal from a control unit provided in the saddle riding type vehicle 1.

  In the saddle riding type vehicle 1, the intercooler out pipe 58 is disposed at a position higher than the inlet pipe 45. The air bypass passage 61 extends vertically between the intercooler out pipe 58 and the inlet pipe 45. The air bypass passage 61 is disposed in front of the engine 31, specifically, between the compressor portion 43 of the supercharger 42 and the intercooler 47 in a side view of the saddle riding type vehicle 1. Further, the air bypass passage 61 is disposed on the right side of the saddle riding type vehicle 1 as shown in FIG.

  The air bypass passage 61 includes an upper pipe 61A and a lower pipe 61B. The upper pipe 61 </ b> A is a pipe that connects between the air bypass valve 62 provided in the air bypass passage 61 and the intercooler out pipe 58. The lower pipe 61B is a pipe that connects between the air bypass valve 62 and the inlet pipe 45. The upper piping 61A and the lower piping 61B are each formed of a pipe, for example.

  The upper end of the upper pipe 61 </ b> A is connected to a connection hole 58 </ b> A formed in the inter-out pipe 58, and the lower end is connected to an inlet 62 </ b> A of the air bypass valve 62. Since the connection hole 58A of the inter-out pipe 58 opens downward and the inlet 62A of the air bypass valve 62 opens to the left, the upper pipe 61A has a curved shape. That is, the upper pipe 61A extends downward from the connection hole 58A, then curves, and then extends rightward to reach the inflow port 62A.

  The lower pipe 61B has an upper end connected to an outlet 62B formed in the air bypass valve 62 and a lower end connected to a connection hole 45C formed in the inlet pipe 45. Since the outlet 62B of the air bypass valve 62 is opened substantially downward, the connection hole 45C of the inlet pipe 45 is opened upward, and the outlet 62B and the connection hole 45C are substantially opposed to each other in the vertical direction. The pipe 61B extends linearly. However, in the present embodiment, as shown in FIG. 11, the opening direction of the outflow port 62B is slightly inclined rearward, so that the lower pipe 61B is slightly curved in accordance therewith.

  The upper end of the air bypass passage 62 is connected to the upstream side of the throttle valve 57, that is, to the intercooler out pipe 58 in a passage connecting the intercooler 47 and the surge tank 63. As a result, when the throttle valve 57 is closed, the compressed air between the compressor portion 43 and the throttle valve 57 of the supercharger 42 is disposed on the upstream side of the compressor portion 43 via the air bypass passage 62. You can escape to 45. In particular, of the air flow paths from the compressor unit 43 to the throttle valve 57 through the outlet pipe 53, the intercooler 47 and the intercooler out pipe 58, the intercooler out pipe 58 closest to the throttle valve 57 is a throttle valve. Since the air pressure when the valve is closed is higher than the other parts, the compressed air on the downstream side of the compressor part 43 can be quickly supplied to the compressor part 43 by connecting the air bypass passage 62 to this part. It is possible to escape to the upstream side, and the pressure on the downstream side of the compressor unit 43 can be quickly reduced.

  The upper end of the air bypass passage 62 is connected to a position close to the throttle valve 57 in the upstream portion of the throttle valve 57 in the passage connecting the intercooler 47 and the surge tank 63. Specifically, the passage length between the connection position of the air bypass passage 62 and the intercooler out pipe 58 and the throttle valve 57 is shorter than the passage length between the connection position and the intercooler 47.

  More specifically, in FIG. 13, as indicated by the alternate long and short dash line in FIG. 13, the axes of the intercooler out pipe 58, the throttle body 56 and the connecting pipe 64 are K, and the upper pipe 62 </ b> A in the intercooler out pipe 58. The position on the axis K corresponding to the location where the upper end of the throttle is connected is P1, the position on the axis K corresponding to the location where the throttle valve 57 is arranged in the throttle body 56 is P2, and the intercooler out pipe 58 and the inter Assuming that the position on the axis K corresponding to the boundary with the discharge portion 52 provided in the cooler 47 is P3, the length of the portion from the position P1 to the position P2 on the axis K is the portion from the position P1 to the position P3. Shorter than the length of.

  Of the portion on the upstream side of the throttle valve 57 in the passage connecting the intercooler 47 and the surge tank 63, the portion close to the throttle valve 57 is the portion where the air pressure when the throttle valve 57 is closed is the other portion. Since the air bypass passage 62 is connected to this portion, the effect of quickly releasing the compressed air on the downstream side of the compressor portion 43 of the supercharger 42 to the upstream side of the compressor portion 43 is obtained. Therefore, it is possible to increase the effect of quickly reducing the pressure on the downstream side of the compressor unit 43.

  As shown in FIG. 11, the lower end of the air bypass passage 62 is connected to the inlet pipe 45 at a position close to the suction port 43 </ b> A of the compressor unit 43 of the supercharger 42. Of the inlet pipe 45, the pressure in the portion close to the suction port 43 </ b> A of the compressor portion 43 is lower than that in the other portions when the throttle valve 57 is closed. Therefore, by connecting the air bypass passage 62 to this portion, The effect of quickly letting the compressed air on the downstream side of the compressor unit 43 escape to the upstream side of the compressor unit 43 can be enhanced, and thus the effect of quickly reducing the pressure on the downstream side of the compressor unit 43 can be enhanced.

  Further, since the intercooler out pipe 58 is disposed on the right side of the saddle riding type vehicle 1, the connection position between the upper end of the air bypass passage 62 and the intercooler out pipe 58, the lower end of the air bypass passage 62, and the inlet pipe. 45 can be brought close to each other. Thereby, the air bypass passage 62 can be shortened. Alternatively, since both connection positions can be opposed to each other in the vertical direction, the linear air bypass passage 62 can be easily formed.

  The air bypass valve 62 is arranged in the middle of the air bypass passage 61 and, as can be understood from FIGS. 4, 11, and 12, is located on the side of the engine 31 in the front view of the saddle riding type vehicle 1. The turbocharger 42 is disposed on the side where the supercharger 42 is disposed, that is, on the right side of the engine 31. Thereby, the air bypass valve 62 can be disposed near the compressor section 43 of the supercharger 42. Therefore, the air bypass passage 61 can be shortened, and the lower end of the air bypass passage 61 can be easily connected to the vicinity of the suction port 43A of the compressor portion 43 of the supercharger 42. By forming such an air bypass passage 61, the compressed air on the downstream side of the compressor unit 43 can be quickly released to the upstream side.

  Further, as shown in FIG. 11, the air bypass valve 62 is disposed outside the straddle-type vehicle 1 in the left-right direction and above the compressor unit 43 of the supercharger 42. The air bypass valve 62 is disposed between the intercooler out pipe 58 and the inlet pipe 45 in the vertical direction and closer to the intercooler out pipe 58 than the inlet pipe 45. Since the air bypass valve 62 is disposed on the outer side in the left-right direction of the saddle-side vehicle 1, the amount of the air bypass valve 62 interposed between the driver's head seated on the driver's seat 18 and the air bypass valve 62 is reduced. For example, when the air bypass valve is arranged at the lower part of the engine as in the saddle riding type vehicle described in Patent Document 3, the engine is interposed between the driver's head and the air bypass valve. This is not the case with the saddle riding type vehicle 1 according to the present embodiment. Further, since the air bypass valve 62 is arranged at a high position in the saddle riding type vehicle 1, the distance between the head of the driver seated on the driving seat 18 and the air bypass valve 62 is shortened. As a result, the driver can easily hear the unique air sound generated when the air bypass valve 62 is opened. Thereby, the driver can clearly realize the joy of driving the saddle riding type vehicle 1 with a supercharger.

  Further, since the air bypass valve 62 is disposed on the outer side in the left-right direction of the saddle riding side vehicle 1 and at a high position in the saddle riding type vehicle 1, a user such as a driver can easily see the air bypass valve 62. Can do. Thereby, the satisfaction of the user who owns the saddle riding type vehicle 1 with a supercharger can be enhanced. Further, when a valve having a mechanism for adjusting the preload of a spring that biases the valve body is adopted as the air bypass valve 62, the user can easily reach the air bypass valve 62. Can be easily adjusted.

  Further, since the air bypass valve 62 is located on the side of the engine 31 and at a high position in the saddle riding type vehicle 1, a stepping stone from the ground is difficult to hit the air bypass valve 62 or water from the ground And the like are less likely to be applied to the air bypass valve 62. Therefore, the air bypass valve 62 can be protected from stepping stones, water, and the like.

  On the other hand, as shown in FIG. 4, between the surge tank 63 and the cylinder head 34 of the front cylinder 33 and the cylinder head 36 of the rear cylinder 35, the air temporarily stored in the surge tank 63 is stored in the front cylinder. 33 and an intake pipe 65 that supplies the rear cylinder 35 are provided. In the present embodiment, a pair of intake pipes 65 are provided, and one intake pipe 65 has an upper end connected to a discharge port (not shown) provided in the lower part of the surge tank 63 and a lower end connected to the front cylinder 33. The cylinder head 34 is connected to an intake port. The other intake pipe 65 has an upper end connected to the discharge port of the surge tank 63 and a lower end connected to an intake port provided in the cylinder head 36 of the front cylinder 35. Although not shown, each intake pipe 65 is provided with an injector.

  Further, in the saddle riding type vehicle 1, the exhaust from the front cylinder 33 is passed between the exhaust port provided in the cylinder head 34 of the front cylinder 33 and the turbine portion 44 of the supercharger 42. A front exhaust pipe 66 that supplies the turbine unit 44 is provided. Further, between the exhaust port provided in the cylinder head 34 of the rear cylinder 35 and the turbine section 44 of the supercharger 42, the exhaust from the rear cylinder 35 is supplied to the turbine section 44 of the supercharger 42. A rear exhaust pipe 67 is provided. One end of the front exhaust pipe 66 is connected to the exhaust port of the front cylinder 33, and the other end of the front exhaust pipe 66 extends rearward toward the turbine section 44 of the supercharger 42 through the right side of the front cylinder 33. ing. One end of the rear exhaust pipe 67 is connected to the exhaust port of the rear cylinder 35, and the other end of the rear exhaust pipe 67 passes through the right side of the rear cylinder 35 to the turbine section 44 of the supercharger 42. It extends forward. Further, the other end portions of both the front exhaust pipe 66 and the rear exhaust pipe 67 are connected to each other and then connected to the intake port 44 </ b> A of the turbine section 44.

  Further, between the turbine unit 44 of the supercharger 42 and the silencer 20, the exhaust port of each of the front cylinder 33 and the rear cylinder 35 passes through the front exhaust pipe 66 and the rear exhaust pipe 67 to the turbine unit 44. A delivery pipe 68 for sending the sent exhaust gas to the silencer 20 is provided. The delivery pipe 68 extends in the front-rear direction to the right of the front cylinder 33 and the rear cylinder 35, the front end of the delivery pipe 68 is connected to the discharge port 45B of the turbine section 44, and the rear end of the delivery pipe 68 is the silencer. 20 is connected.

  Operations related to intake and exhaust of the saddle riding type vehicle 1 are as follows. That is, the air taken into the air cleaner 41 from the outside is purified by the air cleaner 41. The purified air is sent to the compressor unit 43 of the supercharger 42 through the inlet pipe 45 and is compressed by the compressor unit 43. The compressed air passes through the outlet pipe 53, further passes through the lower tube 49 of the intercooler 47, is sent to the core 48 of the intercooler 47, and is cooled by the core 48. The cooled air is sent to the surge tank 63 through the upper tube 51 of the intercooler 47, the intercooler out pipe 58, and the throttle body 56, and is temporarily stored in the surge tank 63. Further, the air rectified by being temporarily stored in the surge tank 63 is supplied to the front cylinder 33 and the rear cylinder 35 through the intake pipe 65. The amount of air supplied to the front cylinder 33 and the rear cylinder 35 in this way is adjusted by the throttle valve 57.

  Further, the exhaust discharged from the front cylinder 33 and the rear cylinder 35 is sent to the turbine section 44 of the supercharger 42 through the front exhaust pipe 66 and the rear exhaust pipe 67 and then sent out from the turbine section 44. It is sent to the silencer 20 through 68 and discharged from the silencer 20 to the outside. In the supercharger 42, the turbine wheel provided in the turbine unit 44 is rotated by the pressure of the exhaust gas that is sent to the turbine unit 44 through the front exhaust pipe 66 and the rear exhaust pipe 67. Along with this, the compressor impeller provided in the compressor unit 43 rotates. Thereby, the air sent to the compressor unit 43 through the inlet pipe 45 is compressed.

  When the throttle valve 57 is closed during deceleration or the like and the pressure on the downstream side of the compressor section 43 of the supercharger 42 increases, the air bypass valve 62 opens according to the control signal output from the control unit. As a result, the compressed air in the air passage between the compressor portion 43 and the throttle valve 57 passes from the intercooler out pipe 58 located on the downstream side of the compressor portion 43 via the air bypass passage 61 to the compressor portion 43. It flows to the inlet pipe 45 located on the upstream side. Thereby, the pressure in the air passage between the compressor part 43 and the throttle valve 57 can be lowered.

  In the above-described embodiment, the case where the air bypass valve 62 is disposed in the middle of the air bypass passage 61 has been described as an example. However, the present invention is not limited thereto, and the air bypass valve 62 is connected to the intercooler out pipe 58 and the air bypass passage. You may arrange | position between 61 upper ends.

  In the above-described embodiment, the case where the upper end of the air bypass passage 61 is connected to the intercooler out pipe 58 is taken as an example. However, the present invention is not limited to this, and the upper end of the air bypass passage 61 is connected to the throttle body 56 with the throttle. It may be connected to the upstream portion of the valve 57.

  Further, in the above-described embodiment, the passage connecting the intercooler 47 and the surge tank 63 is inclined from the right outer side of the saddle riding type vehicle 1 toward the middle portion in the left-right direction and the rear end side thereof to the left. Although the case of extending obliquely with respect to the reference line S has been described as an example, instead of this, the passage connecting the intercooler 47 and the surge tank 63 is, for example, so as to overlap the reference line S. You may form so that the intermediate part of the left-right direction of the riding type vehicle 1 may extend linearly. In this case, since the intercooler out pipe 58 is disposed in the middle portion in the left-right direction of the saddle riding type vehicle 1, it is difficult to shorten the air bypass passage 61 connected to the intercooler out pipe 58. On the other hand, the passage connecting the intercooler 47 and the surge tank 63 can be shortened, and the passage can be formed in a straight line.

  In the above-described embodiment, the case where the throttle mechanism 55 is provided between the intercooler 47 and the surge tank 63 is taken as an example. However, the present invention can also be applied to a straddle-type vehicle in which the throttle mechanism is provided between the surge tank and the intake port of the engine.

  In the embodiment described above, the inlet pipe 45 is formed by connecting the pipe 45A and the hose 45B as shown in FIG. 7, but is the inlet pipe 45 formed of a hose or a pipe? The combination of both can be selected as appropriate, and the shape of the hose or pipe and the location where the hose and the pipe are connected can also be selected as appropriate. The same applies to the outlet pipe 53, the intercooler out pipe 58, the connecting pipe 64, and the air bypass passage 61.

  In the above-described embodiment, the motorcycle is taken as an example of the saddle riding type vehicle. However, the present invention can be applied to other types of saddle riding type vehicles. The present invention can also be applied to a V-type engine having three or more cylinders. The present invention can also be applied to a so-called L-type engine in which the front cylinder extends in the horizontal direction forward from the crankcase and the rear cylinder extends in the vertical direction upward from the crankcase.

  Further, the present invention can be appropriately changed without departing from the spirit or idea of the invention which can be read from the claims and the entire specification, and a straddle-type vehicle accompanied with such a change is also applicable to the technology of the present invention. Included in thought.

DESCRIPTION OF SYMBOLS 1 Saddle-type vehicle 31 Engine 32 Crankcase 33 Front cylinder 35 Rear cylinder 41 Air cleaner 42 Supercharger 43 Compressor part 44 Turbine part 45 Inlet piping (1st air passage)
47 Intercooler 55 Throttle mechanism 56 Throttle body 57 Throttle valve 58 Intercooler out piping (second air passage)
61 Air bypass passage (bypass passage)
62 Air bypass valve (Bypass valve)
63 Surge tank 64 Connecting piping

Claims (5)

A V-type engine having at least a pair of cylinders arranged respectively in front and rear;
An air cleaner for purifying air for fuel combustion;
A supercharger that compresses the air purified by the air cleaner;
An intercooler for cooling the air compressed by the supercharger;
A throttle valve for controlling the flow rate of the air cooled by the intercooler to the V-type engine;
A surge tank for temporarily storing the air cooled by the intercooler;
A first air passage connecting the air cleaner and the supercharger;
A second air passage connecting the intercooler and the surge tank;
A bypass passage connecting the second air passage and the first air passage without going through the supercharger;
A straddle-type vehicle comprising a bypass valve for opening and closing the bypass passage,
The supercharger is arranged on the side of the V-type engine,
The bypass valve is on the side of the V-type engine in the front view of the saddle riding type vehicle and on the side where the supercharger is disposed, and in the side view of the saddle riding type vehicle. A straddle-type vehicle characterized by being disposed above. The surge tank is disposed above the V-type engine,
The intercooler is disposed in front of the V-type engine,
The second air passage is disposed at a position higher than the first air passage;
The bypass passage extends vertically between the second air passage and the first air passage,
The bypass valve is disposed between the second air passage and the first air passage in a vertical direction at a position closer to the second air passage than the first air passage. The straddle-type vehicle according to claim 1, wherein The throttle valve is provided in the second air passage;
The straddle-type vehicle according to claim 1 or 2, wherein the bypass passage is connected to the upstream side of the throttle valve in the second air passage.   In the second air passage, a passage length between the connection position of the bypass passage and the second air passage and the slot valve is shorter than a passage length between the connection position and the intercooler. The straddle-type vehicle according to claim 3.   5. The system according to claim 1, wherein at least a part of the second air passage is disposed on one side in the left-right direction of the saddle riding type vehicle in which the supercharger is disposed. The saddle riding type vehicle described.

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