JP6565595B2 - Saddle riding vehicle - Google Patents

Description

  The present invention relates to a straddle-type vehicle including an engine with a supercharger.

  A straddle-type vehicle such as a motorcycle may have an engine with a supercharger in order to improve fuel consumption and output. The saddle riding type vehicle includes a radiator for cooling the engine and the supercharger.

  For example, a motorcycle described in Patent Document 1 includes a radiator disposed on the upper front side of the engine, a supercharger disposed on the lower front side of the engine, a waste gate valve that controls opening and closing of the exhaust path of the engine, have. The waste gate valve is disposed behind the supercharger, so that it is protected from collisions of water (flying water), stones (stepping stones), etc. that are splashed up from the front wheels and fly from the front.

JP2015-78634A

  However, in the above-described technology, since the supercharger, the waste gate valve, and the engine are arranged in the front-rear direction, the total length of the vehicle and the wheel base tend to be long. For this reason, there existed a problem that size reduction of a vehicle was inhibited.

  In order to solve the above-described problems, the present invention provides a straddle-type vehicle that reduces the size of the vehicle and protects the valve mechanism from collisions such as flying water and stepping stones.

  A straddle-type vehicle according to the present invention includes an engine, a radiator that is provided on the front side of the engine and cools cooling water sent from the engine, and a supercharger that compresses combustion air supplied to the engine, And a valve mechanism that adjusts the pressure of the air compressed by the supercharger, and the valve mechanism is provided between the engine and the radiator below the supercharger.

  According to this configuration, since the supercharger and the valve mechanism are arranged side by side in the vertical direction, it is possible to provide the radiator at a position where the radiator is drawn closer to the engine side than when the turbocharger and the valve mechanism are arranged in the front-rear direction. it can. Thereby, the wheelbase of the saddle riding type vehicle can be shortened. Further, since the valve mechanism is hidden behind the radiator (rear side), the valve mechanism can be protected from flying water, stepping stones, and the like flying from the front of the vehicle.

  In this case, the radiator includes an upper radiator disposed on an upper front side of the engine, and a lower radiator disposed separately below the upper radiator, and the valve mechanism includes the engine and the lower radiator. It is preferable that it is provided between.

  According to this configuration, by dividing the radiator into an upper radiator and a lower radiator, it is possible to satisfy the necessary heat dissipation (cooling water cooling performance) and to increase the length in the vehicle width direction (left and right width). Can be suppressed. Further, by covering the front side of the valve mechanism with the lower radiator, the valve mechanism can be protected from a stepping stone from the front of the vehicle.

  In this case, the upper radiator is formed narrower in the vehicle width direction than the engine, the lower radiator is formed narrower in the vehicle width direction than the upper radiator, and the valve mechanism is viewed from the front. It is preferable to be provided at a position covered by the lower radiator.

  According to this configuration, the valve mechanism is integrated inside the length (left-right width) of the lower radiator in the vehicle width direction, so that the engine with the supercharger can be reduced in size.

  In this case, it is preferable that an oil filter that is disposed on the lower front side of the engine and filters engine oil supplied to the engine is further provided, and the valve mechanism is disposed above the oil filter.

  According to this configuration, the valve mechanism is disposed above the oil filter and is covered with the radiator from the front. Thereby, the valve mechanism can be protected from flying water, flying stones, and the like from the front and the bottom of the vehicle.

  In this case, the engine includes a crankcase that houses a crankshaft that is rotated by a piston that reciprocates in a cylinder, and the crankcase is a balancer chamber that houses a balancer shaft that reduces vibration caused by rotation of the crankshaft. The balancer chamber projects forward from the front portion of the crankcase, a part of the turbocharger is disposed on the upper side of the balancer chamber, and the valve mechanism is disposed on the front side of the balancer chamber. It is preferable that they are arranged.

  According to this configuration, a part of the turbocharger is arranged so as to avoid the balancer chamber on the upper side. Therefore, the supercharger, the valve mechanism, and the radiator can be provided at a position that is pulled toward the crankcase side. Thereby, the wheelbase of the saddle riding type vehicle can be shortened.

  In this case, it is preferable that the valve mechanism is disposed inside an under cowl that covers the lower portion of the engine.

  According to this configuration, since the valve mechanism is covered with the under cowl, the valve mechanism can be protected from flying water, stepping stones, and the like from the front, bottom, and sides of the vehicle.

  According to the present invention, it is possible to reduce the size of a vehicle. In addition, the valve mechanism can be protected from collisions such as flying water and stepping stones.

1 is a left side view showing a motorcycle according to an embodiment of the present invention. 1 is a left side view showing an engine unit of a motorcycle according to an embodiment of the present invention. 1 is a right side view showing an engine unit of a motorcycle according to an embodiment of the present invention. 1 is a front view showing an engine unit (excluding a radiator) of a motorcycle according to an embodiment of the present invention. 1 is a plan view showing an engine unit of a motorcycle according to an embodiment of the present invention. 1 is a front view showing an engine unit (including a radiator) of a motorcycle according to an embodiment of the present invention. 1 is a plan view showing an engine and a cooling system of a motorcycle according to an embodiment of the present invention. 1 is a cross-sectional view schematically showing a cooling system for an engine unit of a motorcycle according to an embodiment of the present invention. 1 is a front view showing an engine and a cooling pipe of a motorcycle according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the front, rear, left, right, up and down directions are based on the driver seated on the motorcycle seat.

  With reference to FIG. 1, the overall configuration of a motorcycle 1 according to the present embodiment will be described. FIG. 1 is a left side view showing the motorcycle 1.

  The body frame 211 of the motorcycle 1 is formed, for example, by joining a plurality of steel pipes. Specifically, the body frame 211 is disposed on the head pipe 212 disposed on the upper front side of the motorcycle 1 and on the left and right portions of the motorcycle 1, and the front end portion is connected to the upper portion of the head pipe 212. A pair of main frames 213 extending rearward while the rear end side is inclined downward, and the left and right parts of the motorcycle 1, respectively, the front end is connected to the lower part of the head pipe 212, and the rear end is A pair of down tubes 214 that extend rearward while inclining downward largely from the main frame 213, are arranged on the left and right parts of the motorcycle 1, respectively, and the front ends are connected to the intermediate parts of the down tubes 214, respectively. A pair of side frames 215 whose rear end side extends rearward, and a pair of pivot frames joined to the rear end side of the main frame 213, respectively. It is provided with a 216, a. A reinforcing frame 217 is provided between the main frame 213, the down tube 214, and the side frame 215.

  A steering shaft (not shown) is inserted into the head pipe 212, and a steering bracket 225 is provided at each of an upper end portion and a lower end portion of the steering shaft. A handle 226 is provided on the upper steering bracket 225. The upper and lower steering brackets 225 support the upper portions of a pair of left and right front forks 227, and the front wheels 228 are supported on the lower ends of the front forks 227.

  A front end side of the swing arm 232 is supported between the pair of left and right pivot frames 216 via a pivot shaft 231, and a rear wheel 233 is supported on the rear end side of the swing arm 232. A driven sprocket 234 is provided on the axle of the rear wheel 233, and a chain 235 that transmits power of the engine 12 described later is wound around the driven sprocket 234.

  The engine unit 11 is provided between the front wheel 228 and the rear wheel 233. The engine unit 11 is mainly disposed between the left main frame 213 and the left down tube 214, and the right main frame 213 and the right down tube 214, and is supported by these frames.

  A fuel tank 241 is provided above the engine unit 11, and a seat 242 is provided behind the fuel tank 241. A side stand 243 is provided on the left side of the motorcycle 1 and behind the lower part of the engine unit 11. An upper cowl 244 is provided on the upper front side of the motorcycle 1. The motorcycle 1 is provided with an under cowl 245 that mainly covers the front lower side of the engine unit 11.

  Next, the engine unit 11 will be described with reference to FIGS. FIG. 2 is a left side view showing the engine unit 11. FIG. 3 is a right side view showing the engine unit 11. FIG. 4 is a front view showing the engine unit 11 (excluding the radiator 33). FIG. 5 is a plan view showing the engine unit 11. FIG. 6 is a front view showing the engine unit 11 (including the radiator 33). FIG. 7 is a plan view showing the engine 12 and the cooling system. FIG. 8 is a cross-sectional view schematically showing a cooling system of the engine unit 11. FIG. 9 is a front view showing the engine 12 and the cooling pipe 61.

  The engine unit 11 includes an engine 12, a primary speed reduction mechanism that transmits power of the engine 12 to the rear wheels 233, a part of a drive system such as a clutch and a transmission, a lubrication system that lubricates a movable part of the engine 12, air, An intake system (including a supercharger 113) that supplies a fuel-air mixture to the engine 12, a part of an exhaust system that discharges exhaust gas generated by the combustion of the mixture from the engine 12, and the engine 12 are cooled. A cooling system, and an AC generator that generates electric power by utilizing rotation of the crankshaft.

  In this embodiment, the engine 12 is, for example, a water-cooled parallel two-cylinder four-cycle gasoline engine. As shown in FIGS. 2 and 3, the engine 12 includes a crankcase 13 that houses a crankshaft (not shown), a cylinder 14 that is provided on the crankcase 13, and a cylinder head that is provided on the cylinder 14. 15 and a cylinder head cover 16 provided on the cylinder head 15.

  An oil pan 17 for storing engine oil is provided below the crankcase 13. The cylinder axis of the engine 12 is inclined so that the upper side is positioned forward of the lower side. The crankshaft in the crankcase 13 is rotated by a piston (not shown) that reciprocates in the cylinder 14. The crankcase 13 is provided with a balance shaft (not shown) that reduces vibration caused by rotation of the crankshaft (piston movement). The balance shaft is disposed in front of the crankshaft and is accommodated in a balancer chamber 18 (see FIG. 2) that projects forward from the front portion of the crankcase 13. The balancer chamber 18 is formed integrally with the crankcase 13 so that a part of the front wall of the crankcase 13 bulges forward. A magneto chamber 19 (see FIG. 2) is provided on the left portion of the crankcase 13, and an AC generator (not shown) is accommodated in the magneto chamber 19.

  A part of the drive system of the engine unit 11 is disposed at the rear part of the engine 12. That is, the transmission case 21 is integrally formed on the rear side of the crankcase 13 and the cylinder 14, and the primary reduction mechanism and the transmission are accommodated in the transmission case 21. A clutch cover 22 that covers the clutch is attached to the right portion of the transmission case 21 (see FIG. 3). A sprocket cover 23 that covers the drive sprocket is provided on the left side of the transmission case 21 (see FIG. 2). A chain 235 that transmits the power of the engine 12 to the rear wheel 233 is wound around the drive sprocket (see FIG. 1).

  As shown in FIGS. 2 to 4, the lubrication system of the engine unit 11 includes an oil pump (not shown), an oil filter 25, and a water-cooled oil cooler 26. The oil pump pumps up engine oil stored in the oil pan 17 of the engine 12 and supplies it to various parts of the engine 12. The oil filter 25 filters engine oil supplied to the engine 12. The oil cooler 26 cools engine oil supplied to the engine 12. The oil filter 25 and the oil cooler 26 are arranged side by side near the center in the left-right direction (vehicle width direction) on the front side of the lower end of the engine 12 (see FIG. 4). Specifically, the oil filter 25 is disposed below the balancer chamber 18 and attached to the left side of the center of the crankcase 13. The oil cooler 26 is disposed below the balancer chamber 18 and attached to the right side of the center of the crankcase 13.

  As shown in FIGS. 2 to 5, the intake system of the engine unit 11 includes an air cleaner 111, a supercharger 113, an intercooler 117, an exhaust duct 118, a surge tank 119, an electronic control throttle device 120, and an injector 123. ing.

  As shown in FIGS. 4 and 5, the air cleaner 111 is arranged on the upper left side of the engine 12. The air cleaner 111 is a device that filters air taken in from the outside, and an air filter (not shown) is provided therein. 2 and 5, the suction port 112 of the air cleaner 111 is schematically indicated by a two-dot chain line, but the position of the suction port 112 can be set as appropriate. The suction port 112 is provided with an air duct (not shown) that guides external air to the air cleaner 111.

  As shown in FIGS. 2 to 4, the supercharger 113 is provided on the front side of the engine 12 and above the oil cooler 26 and the like. The supercharger 113 compresses the combustion air supplied to the engine 12.

  As shown in FIGS. 2, 4, and 6, the supercharger 113 includes a turbine unit 114, a compressor unit 115, and a bearing unit 116. The turbine unit 114 is driven by exhaust gas from the engine 12. The compressor part 115 receives the driving force of the turbine part 114 and compresses air. The bearing portion 116 has a function of cooling the supercharger 113 by allowing cooling water to pass therethrough.

  The turbine portion 114 is disposed at a substantially central portion of the engine 12 in the left-right direction (vehicle width direction). The turbine section 114 includes a turbine wheel (not shown) that is rotatably supported inside the turbine housing 114A. The turbine housing 114A is formed in a substantially cylindrical shape. An exhaust inflow portion 114B is formed on the upper side of the turbine housing 114A, and an exhaust outflow portion 114C is formed on the right side of the turbine housing 114A.

  The compressor unit 115 is disposed on the left side of the turbine unit 114. The compressor unit 115 includes a compressor impeller (not shown) that is rotatably supported in the compressor housing 115A. The compressor housing 115A is formed in a substantially cylindrical shape. An air inflow portion 115B is formed on the left side of the compressor housing 115A, and an air outflow portion 115C (see FIG. 4) is formed on the upper side of the compressor housing 115A. The compressor unit 115 may be arranged on the right side of the turbine unit 114.

  As shown in FIGS. 4 and 6, the bearing portion 116 is disposed between the turbine portion 114 and the compressor portion 115. The bearing portion 116 includes a bearing (not shown) that pivotally supports the turbine wheel and the compressor impeller at an intermediate portion. Engine oil is supplied to the bearing portion 116 by driving an oil pump. Cooling water is supplied to the bearing portion 116 by driving a water pump 30 described later.

  As shown in FIGS. 2 and 4, the upper portion (a part) of the supercharger 113 is disposed above the balancer chamber 18. Specifically, the upper part of the turbine part 114, the compressor part 115, and the bearing part 116 are located above the balancer chamber 18.

  As shown in FIGS. 2, 4, and 6, a waste gate valve 133 as a valve mechanism is provided below the supercharger 113. Specifically, the waste gate valve 133 is disposed above the oil filter 25. The waste gate valve 133 is disposed on the front side of the balancer chamber 18.

  The waste gate valve 133 adjusts the pressure of air compressed by the supercharger 113 (supercharging pressure). The waste gate valve 133 includes a link rod 133A and an actuator part 133B.

  The link rod 133A extends leftward from the lower left side surface of the turbine housing 114A. The link rod 133A is connected to a bypass valve (not shown) provided in the turbine housing 114A. The bypass valve is provided to guide part of the exhaust gas discharged from the engine 12 to the exhaust system without passing it through the turbine housing 114A. The actuator portion 133B is fixed to the extended tip portion of the link rod 133A. A spring (not shown) that is elastically deformed in conjunction with a change in supercharging pressure is provided inside the actuator portion 133B. The waste gate valve 133 adjusts the supercharging pressure by opening and closing the bypass valve.

  As shown in FIGS. 3 to 5, the intercooler 117 is disposed on the upper right side of the engine 12. The intercooler 117 is a device that cools the air that has been compressed by the compressor unit 115 of the supercharger 113 and has reached a high temperature. In the vicinity of the intercooler 117, an exhaust duct 118 that discharges air (exhaust air) that has passed through the intercooler 117 to the outside is provided. As shown in FIGS. 2 and 5, the surge tank 119 is disposed on the upper rear side of the engine 12. The surge tank 119 is a device that rectifies the flow of air cooled by the intercooler 117. As shown in FIG. 5, a connecting pipe 127 is connected between the intercooler 117 and the surge tank 119. The connecting pipe 127 is disposed on the right rear side above the engine 12.

  The electronically controlled throttle device 120 is a device that adjusts the amount of air that passes through the intercooler 117 and is supplied to the intake port of the engine 12. As shown in FIG. 2, the electronic control throttle device 120 includes a throttle body 121, a throttle valve (not shown) provided inside the throttle body 121 and opening and closing an intake passage formed in the throttle body 121, And a drive motor 122 for driving the throttle valve. The throttle body 121 is disposed on the rear upper side of the engine 12 between the surge tank 119 and the intake port of the engine 12.

  The injector 123 is a device that injects fuel into the intake port of the engine 12, and a delivery pipe 124 that supplies fuel from the fuel tank 241 to the injector 123 is connected to the injector 123.

  As shown in FIGS. 4 and 5, an air intake pipe 125 is connected between the air cleaner 111 and the compressor portion 115 (air inflow portion 115 </ b> B) of the supercharger 113. The air intake pipe 125 is disposed on the front left side of the engine 12. An air outlet pipe 126 is connected between the compressor unit 115 (air outflow unit 115C) of the supercharger 113 and the intercooler 117. The air outlet pipe 126 is disposed on the front left side of the engine 12 and on the right side of the air intake pipe 125. An air bypass passage 128 that connects the air intake pipe 125 and the air outlet pipe 126 is provided in the vicinity of the compressor unit 115 (see FIGS. 2 and 4). An air bypass valve 129 that switches between communication and blocking of the air bypass passage 128 is provided in the middle of the air bypass passage 128 (see FIGS. 2 and 5).

  As shown in FIG. 4, the exhaust system of the engine unit 11 includes an exhaust pipe 131, a muffler joint pipe 132, a muffler (not shown), and the like.

  The exhaust pipe 131 is connected between the engine 12 and the supercharger 113. One end (upstream end) of the exhaust pipe 131 branches into two and is connected to a pair of left and right exhaust ports (not shown) formed on the front side of the engine 12. The other end side (downstream end part) of the exhaust pipe 131 is coupled to one and connected to the exhaust inflow part 114B of the turbine part 114. In the present embodiment, the exhaust pipe 131 is formed integrally with the turbine housing 114 </ b> A of the turbine unit 114. The exhaust pipe 131 may be configured separately from the turbine housing 114A and connected to the turbine housing 114A.

  The muffler joint pipe 132 is connected between the supercharger 113 and the muffler. One end side (upstream end portion) of the muffler joint pipe 132 is connected to the exhaust outlet portion 114 </ b> C of the turbine portion 114. The other end side (downstream end side) of the muffler joint pipe 132 passes through the lower right side of the engine 12 and extends toward the muffler disposed on the rear side (see FIG. 3).

  The exhaust gas of the engine 12 is supplied from each exhaust port to the turbine unit 114 (inside the turbine housing 114A) of the supercharger 113 via the exhaust pipe 131. The exhaust gas supplied into the turbine housing 114A rotates the turbine wheel. Further, the exhaust gas passes through the muffler joint pipe 132 from the exhaust outflow portion 114C and is discharged to the outside from the muffler. By the way, as described above, the waste gate valve 133 controls the opening and closing of the bypass valve to adjust the inflow amount (supercharging pressure) of the exhaust gas to the turbine unit 114. A part of the exhaust gas supplied through the exhaust pipe 131 flows out to the muffler joint pipe 132 without passing through the turbine housing 114A.

  The turbine wheel of the turbine unit 114 is rotated by the exhaust gas supplied into the turbine housing 114A. The rotational energy of the turbine wheel rotates the compressor impeller of the compressor unit 115 via the bearing unit 116.

  Engine combustion air is supplied from the air cleaner 111 to the compressor unit 115 (in the compressor housing 115A) of the supercharger 113 via the air intake pipe 125. The air supplied into the compressor housing 115A is compressed by a rotating compressor impeller. The compressed air passes through the air outlet pipe 126 from the air outflow portion 115C and is supplied to the intercooler 117. The compressed air is cooled by the intercooler 117, sequentially passes through the connecting pipe 127, the surge tank 119, and the throttle body 121 of the electronically controlled throttle device 120, and is supplied to the intake port of the engine 12.

  As shown in FIG. 3, the cooling system of the engine unit 11 includes a water jacket (not shown), a water pump 30, a radiator 33, a cooling water flow control unit 41, a main pipe 51, a cooling pipe 61, It has.

  The water jacket is provided on the cylinder 14 and the cylinder head 15. The cylinder 14 and the cylinder head 15 are cooled by cooling water flowing through the water jacket.

  The water pump 30 is attached to the right side of the crankcase 13 (see FIG. 4). The water pump 30 is provided with a pump inlet 31. The water pump 30 is provided with a supply portion 30A for supplying cooling water to the water jacket. A cooling water discharge port 30 </ b> B is provided on the front side of the water pump 30. The water pump 30 operates using the rotation of the crankshaft and feeds cooling water to the engine 12 and the like.

  As shown in FIGS. 2, 3, and 6, the radiator 33 is provided on the front side of the engine 12 and the supercharger 113. The radiator 33 cools the cooling water sent from the engine 12 by receiving the traveling wind or driving the radiator fan 40.

  The radiator 33 includes an upper radiator 34 and a lower radiator 35. The upper radiator 34 is disposed on the upper front side of the engine 12. The lower radiator 35 is disposed below (separated from) the lower radiator 34. The upper radiator 34 and the lower radiator 35 are connected via a pair of left and right connecting hoses 36. Inside each of the radiators 34 and 35, a flow path (not shown) for circulating the cooling water and releasing the heat of the cooling water to the atmosphere is formed. In FIG. 6, the lower radiator 35 is indicated by a broken line.

  The upper radiator 34 is formed in a substantially rectangular parallelepiped shape that is flat in the front-rear direction and long in the left-right direction. The upper radiator 34 is formed narrower in the left-right direction than the engine 12 (crankcase 13) (see FIG. 6). The upper radiator 34 is supported by the vehicle body frame 211 in a posture inclined forward from the lower side to the upper side when viewed from the side (see FIGS. 2 and 3). A radiator inflow port 37 is provided on the upper left side of the rear surface of the upper radiator 34 (see FIGS. 2 and 5). A radiator outlet 38 is provided on the upper right side of the rear surface of the upper radiator 34 (see FIGS. 3 and 5). A radiator fan 40 is provided on the right side of the rear surface of the upper radiator 34 (see FIG. 5).

  The lower radiator 35 is formed in a substantially rectangular parallelepiped shape that is flat in the front-rear direction and long in the left-right direction. The lower radiator 35 is formed narrower in the left-right direction than the upper radiator 34 (see FIG. 6). The lower radiator 35 is provided in a standing posture extending in the vertical direction when viewed from the side (see FIGS. 2 and 3). The lower radiator 35 is supported by the engine 12 via a bracket (not shown).

  As described above, by dividing the radiator 33 into the upper radiator 34 and the lower radiator 35, it is possible to satisfy a necessary heat radiation amount (cooling performance of cooling water) and to have a lateral width (length in the vehicle width direction). Expansion can be suppressed. As shown in FIG. 3, a cooling water supply port 39 to which a water injection hose 56 extending upward is connected is formed on the lower right side of the rear surface of the upper radiator 34. A cooling water injection part 58 having a cooling water injection port 57 is provided at the upper end of the water injection hose 56. In addition, a reservoir tank 59 is connected to the radiator 33 via a reserve tube (not shown).

  As shown in FIGS. 6 and 7, the cooling water flow control unit 41 is disposed on the right front side above the cylinder head cover 16. The cooling water flow control unit 41 is provided to adjust the amount of cooling water to be circulated to the radiator 33 in accordance with the temperature of the cooling water, and to keep the cooling water at a predetermined appropriate temperature. As shown in FIG. 8, the cooling water flow control unit 41 includes a thermostat housing 42 and a thermostat 43.

  A first cooling water inlet 44 is formed on the rear side of the left housing 42 </ b> L of the thermostat housing 42. A second cooling water inlet 45 is formed on the left side of the left housing 42L. A cooling water outlet 46 is formed on the front side of the left housing 42L. A water temperature sensor S for detecting the temperature of the cooling water flowing through the inside of the left housing 42L is attached to the left side of the rear portion of the left housing 42L.

  A cooling water return port 47 is formed on the front side of the right housing 42R of the thermostat housing 42. A cooling water outlet 48 is formed on the rear side of the right housing 42R. A cooling water bypass passage 49 is formed between the left housing 42L and the right housing 42R.

  The thermostat 43 is installed in the right housing 42R. The thermostat 43 opens and closes the flow path between the cooling water return port 47 and the cooling water outlet 48 and opens and closes the cooling water bypass passage 49 according to the temperature of the cooling water.

  As shown in FIGS. 7 and 8, the main pipe 51 is provided to supply cooling water that has cooled the engine 12 to the water pump 30 and the radiator 33. That is, the water pump 30, the radiator 33, the cooling water flow control unit 41, and the main pipe 51 form an engine cooling water circulation structure that circulates cooling water for cooling the engine 12.

  The main pipe 51 includes a cylinder outlet hose 52, a water pump inlet hose 53, a radiator inlet hose 54, and a radiator outlet hose 55. The main piping 51 excluding the cylinder outlet hose 52 is concentrated and arranged in the space between the engine 12 and the radiator 33 (see FIGS. 2 and 3). In addition, each hose 52-55 is formed with the synthetic resin etc. which have flexibility, for example.

  The cylinder outlet hose 52 is connected between the outflow portion (not shown) of the water jacket and the first cooling water inlet 44. The water pump inlet hose 53 is connected between the cooling water outlet 48 and the pump inlet 31 of the water pump 30. The radiator inlet hose 54 is connected between the coolant outlet 46 and the radiator inlet 37 of the upper radiator 34. The radiator outlet hose 55 is connected between the radiator outlet 38 of the upper radiator 34 and the coolant return port 47.

  As shown in FIG. 8 and FIG. 9, the cooling pipe 61 is provided to supply cooling water that has cooled the oil cooler 26 and the supercharger 113 to the water pump 30 and the radiator 33. That is, the water pump 30, the radiator 33, the cooling water flow control unit 41, and the cooling pipe 61 form a supercharger cooling water circulation structure that circulates cooling water for cooling the oil cooler 26 and the supercharger 113.

  The cooling pipe 61 includes a branch pipe 62, a first inflow pipe 63, a second inflow pipe 64, a first outflow pipe 65, a second outflow pipe 66, and a merging pipe 67. ing. The cooling pipe 61 is arranged in a concentrated manner in the space between the engine 12 and the radiator 33 (see FIG. 3). The branch pipe 62, the first inflow pipe 63, the second inflow pipe 64, the first outflow pipe 65, and the junction pipe 67 may each be formed of a flexible synthetic resin hose. Although it is preferable, it may be formed of a metal pipe.

  The upstream end of the branch pipe 62 is connected to the cooling water discharge port 30 </ b> B of the water pump 30. The downstream end of the branch pipe 62 is branched into two and connected to the first inflow pipe 63 and the second inflow pipe 64. The first inflow pipe 63 is connected between the branch pipe 62 and the right side surface of the oil cooler 26. The second inflow pipe 64 is connected between the branch pipe 62 and the lower side of the supercharger 113 (bearing portion 116). That is, the second inflow pipe 64 is arranged in parallel with the first inflow pipe 63. A downstream end portion of the second inflow pipe 64 is connected to a lower inflow pipe 116 </ b> A that protrudes from the lower surface of the bearing portion 116.

  The first outflow pipe 65 extends from the oil cooler 26 to the upper right. The second outflow pipe 66 extends rightward from the upper side of the bearing portion 116. The first outflow pipe 65 and the second outflow pipe 66 are arranged in parallel to each other, and merge above the supercharger 113 and the like. The second outflow pipe 66 has a supercharger outlet pipe 66A and a supercharger outlet hose 66B. The upstream end portion of the supercharger outlet pipe 66 </ b> A is connected to an upper outlet pipe 116 </ b> B protruding from the upper surface of the bearing portion 116. The supercharger outlet hose 66B is connected to the downstream end of the supercharger outlet pipe 66A. The supercharger outlet pipe 66A is preferably made of metal or the like, and the supercharger outlet hose 66B is preferably made of synthetic resin or the like. However, the entire second outlet pipe 66 is made of metal pipe. Alternatively, it may be formed of a synthetic resin hose.

  The junction pipe 67 joins the first outlet pipe 65 and the second outlet pipe 66 (supercharger outlet hose 66B). The junction pipe 67 is connected between the junction of both the outflow pipes 65 and 66 and the second cooling water inlet 45. The junction pipe 67 is provided in an upward gradient from the right side to the left side.

  Here, the flow of the cooling water will be described with reference to FIGS. 8 and 9. When the engine 12 (water pump 30) is started, the cooling water is sent from the supply unit 30A to the water jacket of the engine 12 to cool the cylinder 14 and the cylinder head 15. The cooling water used for cooling the engine 12 flows into the cooling water flow control unit 41 (left housing 42L) through the cylinder outlet hose 52.

  When the water pump 30 is started, the cooling water is discharged from the cooling water discharge port 30 </ b> B of the water pump 30, flows through the branch pipe 62, and is divided into the inflow pipes 63 and 64. The cooling water flowing through the first inflow pipe 63 is supplied to the oil cooler 26 to cool the engine oil. On the other hand, the cooling water flowing through the second inflow pipe 64 is supplied to the bearing unit 116 to cool the turbine wheel bearing and the like.

  The cooling water used for cooling the oil cooler 26 flows through the first outflow pipe 65, and the cooling water used for cooling the supercharger 113 flows through the second outflow pipe 66. The cooling water flowing through the outflow pipes 65 and 66 joins at the joining pipe 67 and flows into the left housing 42L.

  Here, the thermostat 43 of the cooling water flow control unit 41 controls the flow of the cooling water according to the temperature of the cooling water flowing into the thermostat housing 42.

  As shown in FIG. 8, for example, when the temperature of the cooling water is equal to or lower than a predetermined reference temperature T1 (such as immediately after the engine 12 is started), the thermostat 43 flows between the cooling water return port 47 and the cooling water outlet 48. The passage is fully closed and the cooling water bypass passage 49 is fully opened. At this time, the cooling water flowing in from the cooling water inlets 44 and 45 does not flow through the radiator 33 but flows from the left housing 42L to the right housing 42R through the cooling water bypass passage 49. The cooling water is supplied to the water pump 30 through the water pump inlet hose 53. Thereby, the warm-up operation of the engine 12 can be performed efficiently.

  Further, for example, when the temperature of the cooling water is higher than the reference temperature T1 and is equal to or lower than a predetermined reference temperature T2 (T2> T1), the thermostat 43 increases the cooling water return port 47 and the cooling water outlet according to the temperature rise of the cooling water. While increasing the area of the flow path between 48 and 48, the area of the cooling water bypass passage 49 is decreased. Therefore, the amount of cooling water flowing through the radiator 33 increases as the temperature of the cooling water increases.

  Specifically, the cooling water in the left housing 42 </ b> L flows into the upper radiator 34 through the radiator inlet hose 54. A portion of the cooling water is cooled by the upper radiator 34 and flows into the right housing 42 </ b> R through the radiator outlet hose 55. The remaining portion of the cooling water flowing into the upper radiator 34 is supplied to the lower radiator 35 via one connecting hose 36 and cooled. The cooling water cooled by the lower radiator 35 returns to the upper radiator 34 via the other connecting hose 36 or the like, and flows into the right housing 42R via the radiator outlet hose 55.

  On the other hand, the cooling water flowing through the cooling water bypass passage 49 merges with the cooling water flowing through the radiator 33 inside the right housing 42 </ b> R, and is returned to the water pump 30 via the water pump inlet hose 53.

  Further, for example, when the temperature of the cooling water is higher than the reference temperature T2, the thermostat 43 fully opens the flow path between the cooling water return port 47 and the cooling water outlet 48 and fully closes the cooling water bypass passage 49. . At this time, the cooling water in the left housing 42L does not flow through the cooling water bypass passage 49 but flows through the radiator 33 and is returned to the water pump 30 from the right housing 42R.

  2, 3, and 6, the supercharger 113 and the waste gate valve 133 are disposed between the engine 12 and the radiator 33 when viewed from the side. Specifically, the supercharger 113 is provided at a position where it can be seen (looked) from between the upper radiator 34 and the lower radiator 35 when viewed from the front. The waste gate valve 133 is provided between the engine 12 (balancer chamber 18) and the lower radiator 35 on the lower side of the supercharger 113 when viewed from the side. The waste gate valve 133 is provided at a position covered by the lower radiator 35 when viewed from the front (see FIG. 6). That is, the waste gate valve 133 is disposed so as to be hidden behind the lower radiator 35. Further, the waste gate valve 133 is disposed inside an under cowl 245 that covers the lower portion of the engine 12 (see FIG. 1). The under cowl 245 covers the engine 12, the lower radiator 35, and the waste gate valve 133 from the lower side.

  According to the motorcycle 1 according to the present embodiment described above, since the supercharger 113 and the waste gate valve 133 are arranged side by side in the vertical direction, compared to the case where they are arranged in the front-rear direction, The radiator 33 can be provided at a position pulled toward the engine 12 side. Specifically, a part of the supercharger 113 is arranged so as to avoid the balancer chamber 18 upward. Therefore, the supercharger 113, the waste gate valve 133, and the radiator 33 can be provided at positions where they are drawn toward the crankcase 13 side. Thereby, the wheel base of the motorcycle 1 can be shortened.

  Further, according to the motorcycle 1 according to the present embodiment, the waste gate valve 133 is covered with the radiator 33 (the lower radiator 35) when viewed from the front. Specifically, the waste gate valve 133 is disposed above the oil filter 25 and the front side is covered with the radiator 33 (lower radiator 35). The waste gate valve 133 is also covered with the under cowl 245. As a result, the waste gate valve 133 can be protected from flying water, stepping stones, and the like that are jumped up by the front wheel 228 and fly from the front, bottom, and sides of the vehicle. Further, since the supercharger 113 is disposed on the upper side of the balancer chamber 18 and is also covered with the under cowl 245, the supercharger 113 is protected from flying water, stepping stones, and the like flying from the lower side and the side of the vehicle. be able to.

  Further, according to the motorcycle 1 according to the present embodiment, the waste gate valve 133 is concentrated inside the left and right width (length in the vehicle width direction) of the lower radiator 35, so that the engine 12 with the supercharger 113 is Miniaturization can be achieved.

  In the present embodiment, the radiator 33 is composed of the upper and lower radiators 34 and 35, but the present invention is not limited to this. For example, any one of the upper radiator 34 and the lower radiator 35 may be replaced with an intercooler. For example, any one of the upper radiator 34 and the lower radiator 35 may be replaced with an air-cooled oil cooler.

  In the description of the present embodiment, the case where the present invention is applied to the motorcycle 1 is shown. However, the present invention is not limited to this, and a straddle-type vehicle having a similar structure (for example, a front two-wheel, a rear one-wheel tricycle, etc.) On the other hand, the present invention may be applied.

  The description of the above embodiment shows one aspect of the saddle riding type vehicle according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The components in the above embodiment can be appropriately replaced or combined with existing components and the like, and the description of the above embodiment does not limit the content of the invention described in the claims. .

1 Motorcycle (saddle-ride type vehicle)
12 Engine 13 Crank Case 14 Cylinder 18 Balancer Chamber 33 Radiator 34 Upper Radiator 35 Lower Radiator 113 Supercharger 133 Waste Gate Valve (Valve Mechanism)
245 Under cowl

Claims (6)

Engine,
A radiator provided on the front side of the engine for cooling cooling water sent from the engine;
A supercharger for compressing combustion air supplied to the engine;
A valve mechanism for adjusting the pressure of the air compressed by the supercharger,
The straddle-type vehicle, wherein the valve mechanism is provided between the engine and the radiator below the supercharger. The radiator is
An upper radiator disposed on the upper front side of the engine;
A lower radiator that is spaced apart below the upper radiator, and
The straddle-type vehicle according to claim 1, wherein the valve mechanism is provided between the engine and the lower radiator. The upper radiator is formed narrower in the vehicle width direction than the engine,
The lower radiator is formed narrower in the vehicle width direction than the upper radiator,
The straddle-type vehicle according to claim 2, wherein the valve mechanism is provided at a position covered by the lower radiator when viewed from the front. An oil filter that is disposed on the lower front side of the engine and filters engine oil supplied to the engine;
The straddle-type vehicle according to any one of claims 1 to 3, wherein the valve mechanism is disposed above the oil filter. The engine includes a crankcase that houses a crankshaft that is rotated by a piston that reciprocates in a cylinder;
The crankcase includes a balancer chamber that houses a balancer shaft that reduces vibration caused by rotation of the crankshaft.
The balancer chamber protrudes forward from the front portion of the crankcase,
A part of the supercharger is arranged on the upper side of the balancer chamber,
The straddle-type vehicle according to any one of claims 1 to 4, wherein the valve mechanism is disposed in front of the balancer chamber. The straddle-type vehicle according to any one of claims 1 to 5, wherein the valve mechanism is disposed inside an under cowl that covers the lower portion of the engine.

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