JP2017160841A - Ride type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve energy efficiency relating to driving of a supercharger and to suppress lowering of engine output due to a positional relationship between a V-type engine and the supercharger, in a ride-type vehicle including the V-type engine and the supercharger.SOLUTION: In a ride-type vehicle, a supercharger 42 is disposed at a side part of a front cylinder 33 of an engine 31. An exhaust port formed on a cylinder head 34 of the front cylinder 33 and a turbine portion 44 of the supercharger 42 is connected by a front exhaust pipe 62, and an exhaust port formed on a cylinder head 36 of a rear-side cylinder 35 and the turbine portion 44 are connected by a rear-side exhaust pipe 63. Further a delivery pipe 65 for delivering the exhaust air discharged from the turbine portion 44 to a rear part of the engine 31 is disposed along the rear-side exhaust pipe 63.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 to 3 listed 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.

  The supercharger generally includes a compressor unit that compresses air supplied to the combustion chamber of the engine and a turbine unit that drives the compressor unit. The turbine section includes a turbine wheel, and rotates the turbine wheel using the thermal energy of the exhaust discharged from each cylinder of the engine. The compressor unit is driven by the rotation of the turbine wheel.

  In order to supply exhaust gas from each cylinder to the turbine section, an exhaust pipe is provided between the exhaust port of each cylinder and the suction port of the turbine section. Further, in order to exhaust the exhaust gas supplied to the turbine part from the turbine part to the muffler side, a delivery pipe is provided between the exhaust port of the turbine part and the muffler side.

JP 59-53229 A JP 58-174120 A JP 60-17263 A

  By the way, in the case of a V-type engine, since at least a pair of cylinders are respectively arranged before and after the engine, each cylinder and the turbocharger turbine section are compared with those of a parallel 2-cylinder or parallel 4-cylinder engine. The exhaust pipe to be connected is often long. For example, in FIG. 3 of Patent Document 1 or FIG. 2 of Patent Document 2, a straddle-type vehicle provided with a long exhaust pipe connecting between each cylinder of a V-type engine and a turbine section of a supercharger. Is described.

  If the exhaust pipe is long, the degree to which the thermal energy of the exhaust is lowered while the exhaust is supplied from each cylinder to the turbine section becomes large, and the energy efficiency is deteriorated in the configuration in which the turbine wheel is rotated by the thermal energy of the exhaust.

  Further, depending on the positional relationship between the V-type engine and the supercharger in the saddle-ride type vehicle, the length of the exhaust pipe connecting the cylinder arranged on the front side and the turbine portion of the supercharger is arranged on the rear side. The length of the exhaust pipe that connects the cylinder and the turbine section of the turbocharger may differ greatly. If the length of the exhaust pipe differs greatly between the front cylinder and the rear cylinder, the difference in exhaust temperature between the front cylinder and the rear cylinder increases. For this reason, it is necessary to make the fuel adjustment or ignition timing settings different greatly between the front cylinder and the rear cylinder, and as a result, the engine output may decrease.

  The present invention has been made in view of, for example, the problems described above, and an object of the present invention is to improve the energy efficiency related to the driving of the supercharger even when the supercharger is provided in the V-type engine. It is to provide a riding type vehicle. Another object of the present invention is to provide a straddle-type vehicle capable of suppressing a decrease in engine output due to a positional relationship between a V-type engine and a supercharger.

  In order to solve the above-described problems, a saddle-ride type vehicle according to the present invention includes a V-type engine having at least a pair of cylinders including a front cylinder and a rear cylinder disposed in front and rear, and the front cylinder and the rear side. A turbocharger that is driven using the exhaust from the cylinder and compresses the air for fuel combustion, the front cylinder and the supercharger are connected, and the exhaust from the front cylinder is supplied to the turbocharger. A first exhaust passage, a second exhaust passage for connecting the rear cylinder and the supercharger, and supplying exhaust from the rear cylinder to the supercharger; and the supercharger. A third exhaust passage for sending the exhaust discharged from the supercharger to the rear of the V-type engine, and the supercharger is disposed on one side in the left-right direction of the front cylinder, Exhaust passage is after The third exhaust passage extends from the supercharger to the V-type on one side in the left-right direction of the V-type engine. It extends along the second exhaust passage toward the rear of the engine.

  In this aspect of the present invention, the supercharger is disposed on one side in the left-right direction of the front cylinder, and the supercharger is located near the front cylinder. Accordingly, the first exhaust passage connecting the front cylinder and the supercharger can be shortened. Thereby, the fall of the thermal energy of the exhaust_gas | exhaustion supplied to a supercharger from a front side cylinder can be suppressed. On the other hand, since the supercharger is arranged on one side of the front cylinder in the left-right direction, the distance between the rear cylinder and the supercharger is longer than the distance between the front cylinder and the supercharger. . As a result, the second exhaust passage connecting the rear cylinder and the supercharger is longer than the first exhaust passage. However, according to the above aspect of the present invention, since the third exhaust passage is arranged along the second exhaust passage, the supply from the rear cylinder to the supercharger is performed through the second exhaust passage. It is possible to suppress a decrease in the heat energy of exhaust gas. In other words, the third exhaust passage is a passage for sending the exhaust supplied from the front cylinder and the rear cylinder to the supercharger to, for example, a muffler provided behind the V-type engine. Hot exhaust flows through the passage. The third exhaust passage is disposed along the second exhaust passage, and the second exhaust passage and the third exhaust passage are adjacent to each other over a wide range, whereby the exhaust gas flowing through the third exhaust passage is arranged. Utilizing heat, it is possible to suppress the temperature decrease of the exhaust gas flowing through the second exhaust passage, and it is possible to suppress the decrease in thermal energy of the exhaust gas. Thus, since the fall of the thermal energy of the exhaust_gas | exhaustion supplied to a supercharger from each of a front side cylinder and a back side cylinder can be suppressed, the energy efficiency regarding the drive of a supercharger can be improved. In addition, since the difference between the exhaust temperature of the front cylinder and the exhaust temperature of the rear cylinder can be reduced, the fuel control or ignition timing can be set closer to each other between the front cylinder and the rear cylinder, and the engine A decrease in output can be suppressed.

  In the straddle-type vehicle of the present invention described above, it is preferable that the first exhaust passage and the second exhaust passage are connected to the supercharger from above the supercharger.

  According to this aspect of the present invention, the first exhaust passage and the second exhaust passage can each be shortened. Accordingly, it is possible to suppress a decrease in the thermal energy of the exhaust flowing through each exhaust passage.

  In the straddle-type vehicle of the present invention described above, the second exhaust passage and the third exhaust passage are each formed by a pipe, the pipe forming the second exhaust passage, and the third exhaust The pipes forming the passages preferably extend in the same direction while being adjacent to each other on one side in the left-right direction of the V-type engine.

  In this aspect of the present invention, the piping forming the second exhaust passage and the piping forming the third exhaust passage are close to each other over a wide range. Accordingly, the heat of the exhaust gas flowing through the pipe forming the third exhaust passage can be used to suppress the temperature drop of the exhaust gas flowing through the pipe forming the second exhaust passage, and the heat energy of the exhaust gas Can be suppressed.

  In addition, the saddle-ride type vehicle of the present invention described above preferably includes a heat insulating cover that collectively covers the piping that forms the second exhaust passage and the piping that forms the third exhaust passage.

  According to this aspect of the present invention, it is possible to suppress the heat of the exhaust gas flowing through the second exhaust passage from being released to the atmosphere via the piping that forms the second exhaust passage by the heat insulating cover. At the same time, the heat retaining cover can suppress the heat of the exhaust gas flowing through the third exhaust passage from being released to the atmosphere through the piping that forms the third exhaust passage. Thereby, the effect of suppressing the temperature drop of the exhaust gas flowing through the second exhaust passage can be enhanced by utilizing the heat of the exhaust gas flowing through the third exhaust passage.

  The above-described straddle-type vehicle of the present invention may include an exhaust passage assembly in which the second exhaust passage and the third exhaust passage that are adjacent to each other and extend in the same direction are integrated. .

  According to this aspect of the present invention, the second exhaust passage and the third exhaust passage are respectively formed by piping by integrally forming the second exhaust passage and the third exhaust passage in the exhaust passage assembly. Compared with the case where it does, the 2nd exhaust passage and the 3rd exhaust passage can be brought closer to each other, or the range which approaches mutually can be made wider. Further, the boundary portion between the second exhaust passage and the third exhaust passage and the peripheral portion thereof are formed inside the exhaust passage assembly so as not to be exposed to the outside. It is possible to prevent the heat of the exhaust from being released into the atmosphere from the boundary portion with the three exhaust passages or the peripheral portion thereof. Thereby, the effect of suppressing the temperature drop of the exhaust gas flowing through the second exhaust passage can be enhanced by utilizing the heat of the exhaust gas flowing through the third exhaust passage.

  In the straddle-type vehicle of the present invention described above, it is preferable that a catalyst is provided in the third exhaust passage, and the catalyst is adjacent to the second exhaust passage.

  According to this aspect of the present invention, the temperature of the catalyst can be quickly increased by utilizing the heat of the exhaust gas flowing through the second exhaust passage. Therefore, for example, the time for the temperature of the catalyst to reach its activation temperature during cold start can be shortened.

  ADVANTAGE OF THE INVENTION According to this invention, the energy efficiency regarding the drive of a supercharger can be improved in the saddle riding type vehicle provided with the V-type engine and the supercharger. Moreover, according to this invention, it can suppress that an engine output falls by the positional relationship of a V type engine and a supercharger.

It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by the 1st Embodiment of this invention from the right. It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by the 1st Embodiment of this invention from the left. It is explanatory drawing which shows the state which looked at the saddle riding type vehicle by the 1st Embodiment of this invention from the top. FIG. 2 is an explanatory diagram showing an engine, a supercharger, an intercooler, a surge tank, an exhaust pipe, a delivery pipe, and the like in the saddle riding type vehicle according to the first embodiment of the present invention. It is explanatory drawing which shows an engine, a supercharger, an intercooler, a surge tank, etc. seen from the arrow VV direction in FIG. It is explanatory drawing which shows arrangement | positioning of an air cleaner, a supercharger, a surge tank, a fuel tank, and a silencer in the saddle riding type vehicle by the 1st Embodiment of this invention. It is explanatory drawing which shows an intercooler, outlet piping, etc. in the saddle riding type vehicle by the 1st Embodiment of this invention. It is explanatory drawing which shows intercooler out piping, a throttle body, a surge tank, etc. in the saddle riding type vehicle by the 1st Embodiment of this invention. It is explanatory drawing which shows a supercharger, an exhaust manifold, and delivery piping in the saddle riding type vehicle by the 1st Embodiment of this invention. It is explanatory drawing which shows the connection of the turbine part of a supercharger, and an exhaust manifold in the saddle riding type vehicle by the 1st Embodiment of this invention. It is explanatory drawing which shows a supercharger, an exhaust manifold, and delivery piping in the saddle riding type vehicle by the 2nd Embodiment of this invention. It is explanatory drawing which shows a supercharger, an exhaust manifold, delivery piping, and a heat insulation cover in the saddle riding type vehicle by the 3rd Embodiment of this invention. It is sectional drawing which shows the back side exhaust pipe, sending piping, and a heat insulation cover seen from the arrow XIII-XIII direction in FIG. It is explanatory drawing which shows a supercharger, an exhaust manifold, delivery piping, and a heat insulation cover in the saddle riding type vehicle by the 4th Embodiment of this invention. It is explanatory drawing which shows a supercharger, a front side exhaust unit, and a rear side exhaust unit in the saddle riding type vehicle by the 5th Embodiment of this invention. It is explanatory drawing which shows a front side exhaust unit and a rear side exhaust unit in the saddle riding type vehicle by the 5th Embodiment of this invention. It is explanatory drawing which shows a supercharger and an exhaust unit in the saddle riding type vehicle by the 6th Embodiment of this invention.

(First embodiment)
(Basic configuration of saddle riding type vehicle)
1 to 3 show a straddle-type vehicle according to a first embodiment of the present invention. Specifically, FIG. 1 is a diagram of the saddle riding type vehicle according to the first embodiment of the present invention as seen from the right, and FIG. 2 is a diagram of the saddle riding type vehicle as seen from the left. These are the figures which looked at the said saddle 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, the saddle riding type vehicle 1 according to the first 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, and 8 indicates a reference line penetrating in the front-rear direction exactly in the middle of the saddle riding 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 59, the exhaust manifold 61, the delivery pipe 65, and the like provided in the saddle riding type vehicle 1 as viewed from the right. It is the figure which looked at these from the arrow VV direction in FIG. FIG. 6 is a view of the air cleaner 41, the supercharger 42, the surge tank 59, the fuel tank 17, and the silencer 20 provided in the saddle riding type vehicle 1 as viewed 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.

(Intake system for saddle-ride type vehicles)
In addition, the saddle riding type vehicle 1 is provided with an air cleaner 41 for purifying air for fuel combustion. As shown in FIG. 5 or FIG. 6, the air cleaner 41 is disposed on the left side of the engine 31.

  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.

  As shown in FIG. 4, the supercharger 42 is disposed on one side in the left-right direction of the front cylinder 33 of the engine 31, specifically on the right side of the front cylinder 33. More specifically, 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. The supercharger 42 is arranged such that the compressor unit 43 is in front of the turbine unit 44. The supercharger 42 is disposed on the opposite side of the air cleaner 41 in the left-right direction.

  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, for example, stepping stones, sand, and other objects scattered on the ground that are wound up by the rotating front wheel 12 are less likely to hit the supercharger 42 while the saddle riding type vehicle 1 is traveling. 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 the 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.

  An inlet pipe 45 is provided between the air cleaner 41 and the supercharger 42 to send the air purified by the air cleaner 41 to 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. 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.

  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.

  Here, FIG. 7 shows the intercooler 47 together with the down tube 5, the air cleaner 41 and the supercharger 42. As shown in FIG. 7, the intercooler 47 includes a core 48 having a plurality of air passages and heat radiating fins disposed between the air passages, and a compressor portion 43 of the supercharger 42 that is disposed below the core 48. The lower tube 49 that supplies air sent from the core 48 to the core 48, and the upper tube 51 that is disposed on the upper side of the core 48 and discharges the air cooled through the core 48 toward the throttle body 54 (see FIG. 4). It has.

  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. An outlet pipe 53 is provided between the suction part 50 and the discharge port 43B of the compressor part 43 to connect the two.

  In addition, the upper tube 51 is provided with a discharge portion 52 that discharges air that has flowed into the upper tube 51 from the core 48 toward the throttle body 54. The discharge part 52 is arranged on the right part of the upper tube 51.

  As shown in FIG. 4, in the saddle riding type vehicle 1, a throttle body 54 is provided above the cylinder head 34 of the front cylinder 33 of the engine 31. A throttle valve 55 is provided inside the throttle body 54.

  An intercooler out pipe 56 is provided between the intercooler 47 and the throttle body 54 to send air cooled by the intercooler 47 to the throttle body 54. Here, FIG. 8 shows an intercooler out pipe 56, a throttle body 54, a surge tank 59, and the like. As shown in FIG. 8, the front end of the intercooler out pipe 56 is connected to the discharge portion 52 provided in the upper tube 51 of the intercooler 47, and the rear end of the intercooler out pipe 56 is the throttle body 54 in the throttle body 54. It is connected to an opening located upstream from the valve 55.

  In addition, as shown in FIG. 4, the saddle riding type vehicle 1 is configured to release the excess pressure between the compressor unit 43 and the throttle valve 55 to the upstream side of the compressor unit 43 when the throttle valve 55 is closed. An air bypass pipe 57 and an air bypass valve 58 are provided. The air bypass pipe 57 connects between the intercooler out pipe 56 positioned on the downstream side of the compressor unit 43 and the inlet pipe 45 positioned on the upstream side of the compressor unit 43. The air bypass valve 58 is a valve that opens and closes the air bypass pipe 57.

  In addition, as shown in FIG. 4, in the saddle riding type vehicle 1, the air cooled by the intercooler 47 and sent through the throttle body 54 is placed above the front cylinder 33 and the rear cylinder 35 of the engine 31. A surge tank 59 for temporarily storing is provided. Further, the surge tank 59 is disposed behind the throttle body 54. In addition, an opening located downstream of the throttle valve 55 in the throttle body 54 is connected to a suction port 59A provided at the front end portion of the surge tank 59 via a pipe such as a hose or a pipe. The air sent through the throttle body 54 flows into the surge tank 59 from the suction port 59A.

  An exhaust port (not shown) provided in the lower portion of the surge tank 59 is connected to an intake port provided in the cylinder head 34 of the front cylinder 33 and an intake port provided in the cylinder head 36 of the rear cylinder 35. Are connected via an intake pipe 60. Air temporarily stored in the surge tank 59 is supplied from the exhaust port of the surge tank 59 to the two intake ports through the intake pipe 60. Although not shown, each intake pipe 60 is provided with an injector.

  The operation of the intake system in the saddle riding type vehicle 1 is 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 59 through the upper tube 51 of the intercooler 47, the intercooler out pipe 56, and the throttle body 54, and is temporarily stored in the surge tank 59. Further, the air rectified by being temporarily stored in the surge tank 59 is supplied to the front cylinder 33 and the rear cylinder 35 through the intake pipe 60.

(Exhaust system of saddle riding type vehicle)
On the other hand, as shown in FIG. 4, the saddle riding type vehicle 1 is provided with an exhaust manifold 61 that supplies exhaust discharged from the front cylinder 33 and the rear cylinder 35 of the engine 31 to the turbine unit 44 of the supercharger 42. It has been. Further, the saddle riding type vehicle 1 is provided with a delivery pipe 65 for sending exhaust gas supplied from the front cylinder 33 and the rear cylinder 35 to the turbine section 44 to the silencer 20 (see FIG. 1). The turbine unit 44 uses the thermal energy of the exhaust from the front cylinder 33 and the rear cylinder 35 to rotate the turbine wheel and drive the compressor unit 43.

  Here, FIG. 9 shows the supercharger 42, the exhaust manifold 61, the delivery pipe 65, and the like. As shown in FIG. 9, the exhaust manifold 61 includes exhaust gas discharged from the front side exhaust pipe 62 that forms a first exhaust passage for supplying exhaust gas discharged from the front side cylinder 33 to the turbine unit 44 and exhaust gas discharged from the rear side cylinder 35. And a rear exhaust pipe 63 that forms a second exhaust passage for supplying the exhaust gas to the turbine section 44. The exhaust manifold 61 is formed by integrally forming the front exhaust pipe 62 and the rear exhaust pipe 63 by casting, or by joining the front exhaust pipe 62 and the rear exhaust pipe 63 by welding.

  One end of the front exhaust pipe 62 is connected to an exhaust port provided at the front portion of the cylinder head 34 of the front cylinder 33. The front exhaust pipe 62 extends slightly from the exhaust port of the cylinder head 34 to the front, then curves, then extends to the right, then curves, and then extends the right side of the front cylinder 33 to the rear. Yes.

  Further, one end of the rear exhaust pipe 63 is connected to an exhaust port provided at the rear portion of the cylinder head 36 of the rear cylinder 35. The rear exhaust pipe 63 extends slightly from the exhaust port of the cylinder head 36 to the rear, then curves, then extends to the right, then curves, and then extends rightward of the rear cylinder 35 to the front. In addition, the right side of the front cylinder 33 extends forward.

  The other end side of the front exhaust pipe 62 and the other end side of the rear exhaust pipe 63 meet above the turbine section 44 of the supercharger 42 and are coupled together to form a single coupling pipe section 64. To the suction port 44 </ b> A formed in the upper part of the turbine part 44. The coupling pipe part 64 of the exhaust manifold 61 and the suction port 44A of the turbine part 44 are provided around the flange 64A provided at the end of the coupling pipe part 64 of the exhaust manifold 61 and the suction port 44A of the turbine part 44. It is connected by fixing the provided flange 44B with a bolt or the like. Thus, the exhaust manifold 61, that is, the front exhaust pipe 62 and the rear exhaust pipe 63 are arranged at a position higher than the turbine section 44 of the supercharger 42, and from above the turbine section 44 to the turbine section 44. It is connected.

  On the other hand, the delivery pipe 65 is a pipe that forms a third exhaust passage through which the exhaust discharged from the turbine section 44 of the supercharger 42 is sent to the rear of the engine 31. As shown in FIG. 9, the front end of the delivery pipe 65 is connected to a discharge port 44 </ b> C of the turbine unit 44. Specifically, the front end of the delivery pipe 65 and the discharge port 44C of the turbine part 44 are a flange 65A provided at the front end part of the delivery pipe 65 and a flange 44D provided around the discharge port 44C of the turbine part 44. Are fixed by bolts or the like.

  Further, the delivery pipe 65 extends from the exhaust port 44 </ b> C of the turbine unit 44 to the rear of the engine 31 on the right side of the engine 31. Specifically, the front end side of the delivery pipe 65 is located immediately below the rear exhaust pipe 63 and extends along the rear exhaust pipe 63. That is, the rear exhaust pipe 63 and the delivery pipe 65 are adjacent to each other on the right side of the engine 31 and extend parallel to each other in the same direction (front-rear direction). More specifically, the delivery pipe 65 extends beyond the rear part of the rear cylinder 35 from a position slightly behind the outlet 44C of the turbine part 44, and the rear exhaust pipe 63 is connected to the exhaust port of the rear cylinder 35. Until it reaches a position where it begins to curve to the left, it is along the rear exhaust pipe 63 and adjacent to the rear exhaust pipe 63.

  Further, the rear end side of the delivery pipe 65 extends rightward and rearward of the engine 31 toward the rear portion of the saddle riding type vehicle 1 and then curves so as to approach the silencer 20. 20 is connected.

  Further, the delivery pipe 65 is provided with a catalyst 66 that converts harmful substances such as carbon monoxide, hydrocarbons, nitrogen oxides, and the like contained in the exhaust gas into harmless substances. The catalyst 66 is disposed in a portion adjacent to the rear exhaust pipe 63 on the front end side of the delivery pipe 65.

  The operation of the exhaust system in the saddle riding type vehicle 1 is as follows. That is, 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 62 and the rear exhaust pipe 63 in the exhaust manifold 61, and then the turbine section. 44 is sent to the silencer 20 through the delivery pipe 65 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 thermal energy (exhaust pressure) of the exhaust gas that is sent to the turbine unit 44 through the front exhaust pipe 62 and the rear exhaust pipe 63. To do. 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.

  Here, in the saddle riding type vehicle 1, the turbine portion 44 of the supercharger 42 is disposed on the right side of the front cylinder 33, and the turbine portion 44 and the front cylinder 33 are close to each other. Thereby, the front side exhaust pipe 62 can be shortened. Accordingly, it is possible to suppress a decrease in the thermal energy of the exhaust gas flowing through the front exhaust pipe 62.

  On the other hand, compared with the positional relationship between the turbine section 44 and the front exhaust pipe 62, the turbine section 44 and the rear exhaust pipe are separated from each other. As a result, the rear exhaust pipe 63 is longer than the front exhaust pipe 62. However, since the front end side of the delivery pipe 65 extends below the rear side exhaust pipe 63 along the rear side exhaust pipe 63, the rear side exhaust gas is utilized by utilizing the heat of the exhaust gas flowing through the delivery pipe 65. A decrease in thermal energy of the exhaust gas flowing through the pipe 63 can be suppressed. That is, high-temperature exhaust gas discharged from the turbine unit 44 flows through the delivery pipe 65. By arranging the delivery pipe 65 along the rear exhaust pipe 63 and making the rear exhaust pipe 63 and the delivery pipe 65 adjacent to each other in a wide range, the heat of the exhaust gas flowing through the delivery pipe 65 is utilized, A decrease in the temperature of the exhaust gas flowing through the rear exhaust pipe 63 can be suppressed, and a decrease in the thermal energy of the exhaust gas can be suppressed.

  Thus, since the fall of the thermal energy of the exhaust gas supplied from each of the front cylinder 33 and the rear cylinder 35 to the turbine unit 44 can be suppressed, the energy efficiency related to the driving of the turbine unit 44 can be improved. .

  Further, the lengths of the front exhaust pipe 62 and the rear exhaust pipe 63 are made different by suppressing the temperature drop of the exhaust gas flowing through the rear exhaust pipe 63 along the delivery pipe 65 along the rear exhaust pipe 63. Nevertheless, the difference between the exhaust temperature of the front cylinder 33 and the exhaust temperature of the rear cylinder 35 can be reduced. Thereby, between the front side cylinder 33 and the rear side cylinder 35, the setting of fuel control or ignition timing can be brought close to each other, and a decrease in engine output can be suppressed.

  Further, in the delivery pipe 65 of the saddle riding type vehicle 1, the catalyst 66 is disposed at a position adjacent to the rear exhaust pipe 63, and therefore, the heat of the exhaust gas flowing through the rear exhaust pipe 63 is used. The temperature can be increased quickly. Therefore, for example, the time for the temperature of the catalyst 66 to reach its activation temperature during cold start can be shortened.

  Further, in the saddle riding type vehicle 1, the exhaust manifold 61, that is, the front exhaust pipe 62 and the rear exhaust pipe 63 are arranged at a position higher than the turbine portion 44 of the supercharger 42, as described above. The turbine unit 44 is connected to the turbine unit 44 from above. Here, FIG. 10 shows the turbine section 44 of the supercharger 42 and the exhaust manifold 61 connected to the turbine section 44 when the saddle riding type vehicle 1 is viewed from the front. As shown in FIG. 10, when the saddle riding type vehicle 1 is viewed from the front, the connection angle α of the exhaust manifold 61 to the turbine portion 44 is preferably in the range of 30 degrees to 150 degrees.

  That is, when the connection angle α is less than 30 degrees, the supercharger 42 must be separated from the front cylinder 33 to the right in order to connect the exhaust manifold 61 to the turbine portion 44 of the supercharger 42. That is, since it is necessary to secure a space for piping the exhaust manifold 61 between the supercharger 42 and the front cylinder 33, the supercharger 42 must be separated from the front cylinder 33. As a result, the supercharger 42, which is a heavy object, is separated from the center in the left-right direction of the saddle riding type vehicle 1, so that it is difficult to balance the left-right direction of the vehicle, and the maintenance of the vehicle is deteriorated.

  On the other hand, when the connection angle α is larger than 150 degrees, the exhaust manifold 61 goes around and is connected to the turbine section 44 of the supercharger 42. Therefore, the front exhaust pipe 62 and the rear exhaust pipe 63 in the exhaust manifold 61 become longer, and the thermal energy of the exhaust gas flowing through the front exhaust pipe 62 and the rear exhaust pipe 63 is reduced. When the connection angle α is larger than 150 degrees, the exhaust manifold 61 protrudes to the right outer side of the saddle riding type vehicle 1 and the vehicle width increases.

  By setting the connection angle α within the range of 30 degrees or more and 150 degrees or less, the supercharger 42 can be brought closer to the front cylinder 33 to improve the maintenance of the vehicle, and the front exhaust in the exhaust manifold 61 can be improved. The pipe 62 and the rear exhaust pipe 63 can be shortened to suppress a decrease in the heat energy of the exhaust gas flowing through the front exhaust pipe 62 and the rear exhaust pipe 63, and the exhaust manifold 61 is provided outside the saddle riding type vehicle 1. Can be prevented and the vehicle width can be reduced.

(Second Embodiment)
FIG. 11 shows a supercharger, an exhaust manifold, and a delivery pipe in a saddle-ride type vehicle according to the second embodiment of the present invention. In FIG. 11, the same reference numerals are given to the same components as those of the first embodiment of the present invention described above, and the description thereof is omitted. 12 and 13 showing a third embodiment of the present invention, which will be described later, FIG. 14 showing a fourth embodiment of the present invention, and FIGS. 15 and 16 showing a fifth embodiment of the present invention. This also applies to FIG. 17 showing the sixth embodiment of the present invention.

  As shown in FIG. 11, in the saddle riding type vehicle according to the second embodiment of the present invention, the exhaust manifold 71 forms a first exhaust passage for supplying the exhaust discharged from the front cylinder 33 to the turbine unit 73. Casting a front exhaust pipe 74, a rear exhaust pipe 75 forming a second exhaust passage for supplying exhaust discharged from the rear cylinder 35 to the turbine section 73, and a turbine section 73 of the supercharger 72. Formed integrally with each other or joined by welding. Thereby, the heat capacities of the front exhaust pipe 74, the rear exhaust pipe 75, and the turbine section 73 can be reduced. In addition, the number of exhaust system parts can be reduced, and the straddle-type vehicle 1 can be reduced in weight.

(Third embodiment)
FIG. 12 shows a supercharger, an exhaust manifold, a delivery pipe, and a heat insulation cover in a saddle riding type vehicle according to the third embodiment of the present invention. FIG. 13 shows a cross section of the rear exhaust pipe, the delivery pipe, and the heat insulation cover as seen from the direction of arrows XIII-XIII in FIG.

  As shown in FIG. 12, in the saddle-ride type vehicle according to the third embodiment of the present invention, the rear exhaust pipe 63 and the front end side of the delivery pipe 65 are collectively covered with a heat insulating cover 81. The heat insulating cover 81 is formed of a metal such as stainless steel. The heat insulating cover 81 covers most of the rear exhaust pipe 63 and a portion of the delivery pipe 65 that extends along the rear exhaust pipe 63. Further, as shown in FIG. 13, the heat insulating cover 81 surrounds the entire circumference of the rear exhaust pipe 63 and the front end side of the delivery pipe 65 so as to enclose them together. The heat insulating cover 81 also covers the catalyst 66 provided in the delivery pipe 65.

  According to the saddle riding type vehicle according to the third embodiment of the present invention, the heat retaining cover 81 indicates that the heat of the exhaust gas flowing through the rear exhaust pipe 63 is released from the outer peripheral surface of the rear exhaust pipe 63 to the atmosphere. Can be suppressed. At the same time, the heat retaining cover 81 can suppress the heat of the exhaust gas flowing through the delivery pipe 65 from being released from the outer peripheral surface of the delivery pipe 65 to the atmosphere. Therefore, the effect of suppressing the temperature drop of the exhaust gas flowing through the rear exhaust pipe 63 can be enhanced by using the heat of the exhaust gas flowing through the delivery pipe 65. Furthermore, since the catalyst 66 is covered with the heat insulating cover 81, the time for the temperature of the catalyst 66 to reach its activation temperature can be further shortened during cold start. Further, the heat transmitted from the rear exhaust pipe 63 or the delivery pipe 65 to the driver can be suppressed by the heat insulating cover 81.

(Fourth embodiment)
FIG. 14 shows a supercharger, an exhaust manifold, a delivery pipe, and a heat insulation cover in a saddle riding type vehicle according to the fourth embodiment of the present invention. As shown in FIG. 14, in the saddle riding type vehicle according to the fourth embodiment of the present invention, the front end side of the turbine section 44, the front exhaust pipe 62, the rear exhaust pipe 62, and the delivery pipe 65 of the supercharger 42 is provided. The heat insulating cover 82 is collectively covered.

  According to the saddle riding type vehicle according to the fourth embodiment of the present invention, the heat of the exhaust flowing through the front exhaust pipe 62, the heat of the exhaust flowing through the rear exhaust pipe 63, the heat of the exhaust passing through the turbine section 44, and The heat retaining cover 82 can suppress the heat of the exhaust gas flowing through the delivery pipe 65 from being released to the atmosphere. Further, by extending the range covered with the heat insulating cover 82, the heat insulating effect of the heat insulating cover 82 can be enhanced. Therefore, the effect of suppressing the temperature drop of the exhaust gas flowing through the front side exhaust pipe 62 can be enhanced, and the temperature drop of the exhaust gas passing through the turbine unit 44 can be suppressed. Furthermore, the effect of suppressing the temperature drop of the exhaust gas flowing through the rear exhaust pipe 63 can be further enhanced by utilizing the heat of the exhaust gas flowing through the delivery pipe 65.

(Fifth embodiment)
FIG. 15 shows a supercharger, a front exhaust unit, and a rear exhaust unit in a saddle riding type vehicle according to a fifth embodiment of the present invention. FIG. 16 shows a front exhaust unit and a rear exhaust unit in the saddle riding type vehicle.

  As shown in FIG. 15 or FIG. 16, the saddle riding type vehicle according to the fifth embodiment of the present invention is the first to supply the turbine section 93 of the turbocharger 92 and the exhaust from the front cylinder 33 to the turbine section 93. The front exhaust pipe 94 that forms the exhaust passage is provided with a front exhaust unit 91 that is integrally formed by casting. Further, the straddle-type vehicle includes a rear exhaust passage 97 (second exhaust passage) for supplying exhaust from the rear cylinder 35 to the turbine section 93, and exhaust discharged from the turbine section 93 to the rear of the engine 31. A rear exhaust unit 96 is provided as an exhaust passage assembly integrally formed by casting with a delivery passage 98 (third exhaust passage) for delivery to the vehicle. In FIG. 15, the front exhaust unit 91 is shown on the right outer surface, and the rear exhaust unit 96 is shown in cross section.

  The front exhaust unit 91 and the rear exhaust unit 96 are connected by fixing a flange 91A formed on the front exhaust unit 91 and a flange 96A formed on the rear exhaust unit 96 using bolts or the like. Yes. A catalyst 99 is provided in the delivery passage 98.

  According to the saddle-ride type vehicle according to the fifth embodiment of the present invention, the rear exhaust passage 97 and the delivery passage 98 are formed integrally with each other, thereby bringing the rear exhaust passage 97 and the delivery passage 98 closer to each other. Further, they can be brought into close contact with each other. Further, the range in which the rear exhaust passage 97 and the delivery passage 98 approach each other can be widened. In addition, the boundary portion between the rear exhaust passage 97 and the delivery passage 98 and its peripheral portion are formed inside the rear exhaust unit 96 so as not to be exposed to the outside, so that the rear exhaust passage 97 and the delivery passage are provided. It is possible to prevent the heat of the exhaust from being released into the atmosphere from the boundary portion with 98 or its peripheral portion. Thereby, the effect of suppressing the temperature drop of the exhaust gas flowing through the rear exhaust passage 97 can be enhanced by using the heat of the exhaust gas flowing through the delivery passage 98. Further, by arranging the catalyst 99 inside the rear exhaust unit 96 in which the rear exhaust passage 97 and the delivery passage 98 are integrally molded, the time for the temperature of the catalyst 99 to reach its activation temperature is further shortened. be able to. Further, since the turbine section 93, the front exhaust pipe 94, the rear exhaust passage 97, and the delivery passage 98 of the supercharger 92 can be formed by two parts, the front exhaust unit 91 and the rear exhaust unit 96, the exhaust The number of system parts can be reduced.

  In the rear exhaust unit 96, the method of integrating the rear exhaust passage 97 and the delivery passage 98 is not limited to molding by casting, and a pipe that forms the rear exhaust passage 97 and a pipe that forms the delivery passage 98. May be joined together by welding. The same applies to the method of integrating the turbine section 93 and the front exhaust pipe 94 in the front exhaust unit 91.

(Sixth embodiment)
FIG. 17 shows a supercharger and an exhaust unit in a saddle riding type vehicle according to the sixth embodiment of the present invention.

  As shown in FIG. 17, the saddle riding type vehicle according to the sixth embodiment of the present invention includes a front exhaust passage 104 (first exhaust passage), a rear exhaust passage 105 (second exhaust passage), and a delivery. An exhaust unit 103 is provided as an exhaust passage assembly in which the passage 107 (third exhaust passage) is integrally formed by casting. A catalyst 108 is provided in the delivery passage 107.

  According to the saddle riding type vehicle according to the sixth embodiment of the present invention, the same operational effects as those of the above-described fifth embodiment of the present invention can be obtained. Further, by integrating the front exhaust passage 104, the rear exhaust passage 105, and the delivery passage 107, the number of parts can be further reduced.

  In the exhaust unit 103, the method of integrating the front exhaust passage 104, the rear exhaust passage 105, and the delivery passage 107 is not limited to molding by casting, and the piping that forms the front exhaust passage 104 and the rear exhaust passage 105 are used. A method of joining the formed pipe and the pipe forming the delivery passage 107 by welding may be used.

  In each of the above-described embodiments, a motorcycle is taken as an example of a 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.

1 straddle-type vehicle 31 engine 33 front cylinder 34 cylinder head 35 rear cylinder 36 cylinder head 42, 72, 92 turbocharger 43 compressor section 44, 73, 93 turbine section 44A suction port 44C exhaust port 61, 71 exhaust manifold 62 , 74, 94 Front exhaust pipe 63, 75 Rear exhaust pipe 64 Connection pipe section 65 Delivery pipe 66, 99, 108 Catalyst 81, 82 Thermal insulation cover 91 Front exhaust unit 104 Front exhaust passage (first exhaust passage)
96 Rear exhaust unit (exhaust passage assembly)
97, 105 Rear exhaust passage (second exhaust passage)
98, 107 Delivery passage (third exhaust passage)
103 Exhaust unit (exhaust passage assembly)

Claims (6)

A V-type engine having at least a pair of cylinders including a front cylinder and a rear cylinder disposed respectively in front and rear;
A turbocharger that is driven using exhaust from the front and rear cylinders and compresses fuel combustion air;
A first exhaust passage for connecting the front cylinder and the supercharger, and supplying exhaust from the front cylinder to the supercharger;
A second exhaust passage for connecting the rear cylinder and the supercharger, and supplying exhaust from the rear cylinder to the supercharger;
A third exhaust passage connected to the supercharger and sending exhaust discharged from the supercharger to the rear of the V-type engine;
The supercharger is disposed on one side of the front cylinder in the left-right direction,
The second exhaust passage extends from the rear cylinder toward the turbocharger through one side in the left-right direction of the V-type engine,
The third exhaust passage extends along the second exhaust passage from the supercharger toward the rear of the V-type engine on one side in the left-right direction of the V-type engine. Ride type vehicle.   The straddle-type vehicle according to claim 1, wherein the first exhaust passage and the second exhaust passage are connected to the supercharger from above the supercharger.   The second exhaust passage and the third exhaust passage are each formed by piping, and the piping forming the second exhaust passage and the piping forming the third exhaust passage are the left and right sides of the V-type engine. The straddle-type vehicle according to claim 1, wherein the straddle-type vehicle extends in the same direction while being adjacent to each other on one side in the direction.   The straddle-type vehicle according to claim 3, further comprising a heat insulating cover that collectively covers the pipe that forms the second exhaust passage and the pipe that forms the third exhaust passage.   The saddle riding according to claim 1 or 2, further comprising an exhaust passage assembly in which the second exhaust passage and the third exhaust passage, which are adjacent to each other and extend in the same direction, are integrated. Type vehicle.   The straddle-type vehicle according to any one of claims 1 to 5, wherein a catalyst is provided in the third exhaust passage, and the catalyst is adjacent to the second exhaust passage.

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