JP2018184910A - Saddle-ride type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a pressure loss of suction air flowing in a suction path to an engine in a saddle-ride type vehicle in which a water-cooled engine comprising a supercharge is mounted.SOLUTION: In a motorcycle in which a water-cooled engine having a supercharger is mounted, a radiator inlet hose 53 is connected, through an upper side of a radiator 33, to a left part of a front face of the radiator 33. An air intake pipe 125 for feeding suction air that is taken in by an air cleaner 111 to a compressor part 115 of a supercharger 113 and an air outlet pipe 126 feeding the suction air that is compressed by the compressor part 115, to an engine 12 are disposed so as to pass through a left-side portion in a space between the engine 12 and the radiator 33. Front end sides of an exhaust pipe and a muffler joint pipe 132 are disposed in a longitudinal direction intermediate portion or a right-side portion in the space between the engine 12 and the radiator 33.SELECTED DRAWING: Figure 2

Description

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

  A straddle-type vehicle such as a motorcycle equipped with an engine equipped with a supercharger is known. According to an engine equipped with a supercharger, a turbocharger turbine is driven by the flow of exhaust gas from the engine, and the turbocharger compressor is driven by this turbine, and is sucked into the combustion chamber of the engine by this compressor. Compress the intake air. Thereby, the charging efficiency of intake air can be increased and the output of the engine can be increased (see Patent Document 1 below).

Japanese Patent Laying-Open No. 2015-81575

  In a straddle-type vehicle equipped with an engine equipped with a supercharger, it is desirable that the supercharger be disposed at a position close to the exhaust port of the engine because of the structure in which the turbine is driven by the flow of exhaust gas. The exhaust port of the engine is generally opened at the front of the engine, and a radiator is provided in front of the engine. Therefore, it is desirable to arrange the supercharger between the engine and the radiator.

  Further, the exhaust port of the engine and the inlet of the turbine housing of the supercharger are connected by an exhaust pipe, and a muffler joint pipe for flowing the exhaust to the muffler side is connected to the outlet of the turbine housing. Therefore, when the supercharger is arranged between the engine and the radiator, the front end side portions of the exhaust pipe and the muffler joint pipe are arranged between the engine and the radiator.

  In addition, in a saddle-ride type vehicle equipped with an engine equipped with a supercharger, intake air into the engine generally flows into an intake port of the engine via an air cleaner, a turbocharger compressor, an intercooler, and a throttle valve device, To the combustion chamber. In such an intake path, the air cleaner and the compressor of the supercharger are connected by an air intake pipe, and the compressor of the supercharger and the intercooler are connected by an air outlet pipe. When the supercharger is arranged between the engine and the radiator, the compressor of the supercharger is located between the engine and the radiator. Therefore, it is necessary to arrange the air intake pipe and the air outlet pipe so as to pass between the engine and the radiator.

  In addition, in a saddle-riding vehicle equipped with a water-cooled engine, cooling water for cooling the engine is generally sent from a water pump attached to the engine to a cooling water passage in the engine, and from this cooling water passage to the radiator. And return from the radiator to the water pump. In such a cooling water path, the cooling water path in the engine and the radiator are connected by a radiator inlet pipe, and the radiator and the water pump are connected by a radiator outlet pipe. The radiator has a radiator core, an inflow side tank, and an outflow side tank, and the inflow side tank and the outflow side tank are respectively disposed on the left and right sides or the upper and lower sides of the radiator core. The inflow side tank has a connection portion for connecting the radiator inlet pipe, and this connection portion is generally disposed on the rear surface of the inflow side tank. Similarly, also in the outflow side tank, the connecting portion for connecting the radiator outlet pipe is arranged on the rear surface of the outflow side tank. For this reason, it is necessary to arrange the radiator inlet pipe and the radiator outlet pipe so as to pass between the engine and the radiator.

  Thus, in a straddle-type vehicle equipped with a water-cooled engine equipped with a supercharger, it is required to arrange many parts as described above between the engine and the radiator. For this reason, when setting the arrangement of the air intake pipe and the air outlet pipe between the engine and the radiator, in order to avoid interference with other parts, there are many curved portions of the air intake pipe or the air outlet pipe, or The degree of bending increases or the pipe length increases. As a result, the pressure loss of the intake air flowing through the air intake pipe or the air outlet pipe increases, and there is a possibility that the merit of the supercharger that increases the charging efficiency of the intake air and increases the engine output may not be obtained.

  In this regard, in the motorcycle described in Patent Document 1, the supercharger is disposed in front of the lower part of the engine and is located below the space between the engine and the radiator. An air cleaner is disposed below the engine, and an intercooler is disposed behind the engine. Since the air cleaner and the supercharger are close to each other, the air intake pipe can be shortened and the number of curved portions can be reduced. However, since the supercharger and the intercooler are greatly separated from each other, the air outlet pipe becomes long and the degree of bending tends to increase. Therefore, a device for suppressing an increase in pressure loss of the intake air flowing through the air outlet pipe is required. In this motorcycle, since the supercharger is disposed below the space between the radiator and the engine, the distance between the supercharger and the engine exhaust port is large. For this reason, the pressure loss of the exhaust gas flowing from the exhaust port to the turbocharger turbine tends to increase. As a result, the driving force of the turbine tends to decrease, and thus a device for suppressing this is required.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is a straddle-type vehicle equipped with a water-cooled engine equipped with a supercharger, which flows through an intake path to the engine. An object of the present invention is to provide a straddle-type vehicle capable of reducing the pressure loss of intake air.

  In order to solve the above problems, a saddle-ride type vehicle according to the present invention includes a water-cooled engine, a radiator provided in front of the engine and dissipating heat of cooling water, and attached to the engine. A pump for circulating cooling water in the radiator; a first cooling water pipe for flowing cooling water flowing out from the engine to the radiator; and a second cooling water pipe for flowing cooling water flowing out of the radiator to the pump A turbocharger provided in front of the engine for compressing air (hereinafter referred to as “intake air”) sucked into the engine using a flow of exhaust gas discharged from the engine; An intake path that guides the intake air taken in to the supercharger and leads the intake air compressed by the supercharger to the engine, and exhaust exhausted from the engine An exhaust path for leading exhaust gas flowing out from the supercharger to the muffler side, and the intake path of the straddle-type vehicle in a space between the engine and the radiator Cooling water that is disposed so as to pass through a portion on one side in the left-right direction and that passes through the one side in the left-right direction of the saddle riding type vehicle out of the first cooling water pipe and the second cooling water pipe. One end of the pipe is connected to the front surface of the radiator.

  According to the present invention, in a straddle-type vehicle equipped with a water-cooled engine equipped with a supercharger, it is possible to reduce the pressure loss of intake air flowing through the intake passage to the engine.

It is explanatory drawing which shows the motorcycle which is an Example of the saddle riding type vehicle of this invention. 1 is an external view of an engine, a radiator, and the like in a motorcycle according to an embodiment of the present invention when viewed from the left. 1 is an external view of an engine, a radiator, and the like in a motorcycle according to an embodiment of the present invention when viewed from the right side. 1 is an external view of an engine, a radiator, and the like in a motorcycle according to an embodiment of the present invention as viewed from the front. 1 is an external view of an engine or the like (a state where a radiator is removed) in a motorcycle according to an embodiment of the present invention as viewed from the front. It is the external view which looked at the engine, the radiator, etc. in the motorcycle of the example of the present invention from the upper part. 1 is an external view of an engine, a radiator, and the like (a state in which an air cleaner, an intercooler, a surge tank, and the like are removed) in a motorcycle according to an embodiment of the present invention as viewed from above. It is explanatory drawing which shows the cooling water flow control unit in the motorcycle of the Example of this invention.

  A straddle-type vehicle according to an embodiment of the present invention includes a water-cooled engine, a radiator provided in front of the engine, which dissipates heat of the cooling water, and a pump which is attached to the engine and circulates the cooling water through the engine and the radiator. And. Further, the saddle riding type vehicle includes a first cooling water pipe that flows the cooling water flowing out from the engine to the radiator, and a second cooling water pipe that flows the cooling water flowing out from the radiator to the pump.

  Further, the straddle-type vehicle includes a supercharger that is provided in front of the engine and compresses intake air sucked into the engine using a flow of exhaust discharged from the engine. Further, the saddle-ride type vehicle guides intake air taken from the atmosphere to the supercharger, and introduces intake air compressed by the supercharger to the engine, and exhaust exhaust discharged from the engine to the supercharger. And an exhaust path through which the exhaust gas flowing out from the supercharger flows to the muffler side.

  The intake path is disposed so as to pass through a portion on one side in the left-right direction of the straddle-type vehicle in a space between the engine and the radiator of the straddle-type vehicle.

  Of the first cooling water pipe and the second cooling water pipe of the saddle riding type vehicle, one end of the cooling water pipe passing through one side in the left-right direction of the saddle riding type vehicle is connected to the front surface of the radiator. ing.

  According to the saddle riding type vehicle according to the embodiment of the present invention, one end of the cooling water pipe passing through one side in the left-right direction of the saddle riding type vehicle out of the first cooling water pipe and the second cooling water pipe is a radiator. With this configuration, the cooling water pipe can be disposed so as to pass outside the space between the engine and the radiator. That is, the connection part of the one side cooling water piping and the radiator can be arranged so as not to protrude into the space between the engine and the radiator. Thereby, in the space between the engine and the radiator, the connection portion between the cooling water pipe and the radiator does not get in the way, and an empty space is created in a portion located on one side of the straddle-type vehicle. The use of this empty space increases the degree of freedom in the arrangement of the pipes constituting the intake path when arranging the pipes constituting the intake path, for example, air intake pipes or air outlet pipes. Therefore, it is possible to reduce the number of curved portions of the pipes constituting the intake path, to reduce the degree of bending, to shorten the pipe length, or to increase the pipe diameter. Therefore, it is possible to reduce the pressure loss of the intake air flowing through the piping constituting the intake path.

  FIG. 1 shows a motorcycle 1 which is an embodiment of a saddle riding type vehicle of the present invention. In addition, the arrow shown at the lower right in each figure indicates the front, rear, left, right, up and down directions based on the driver of the motorcycle 1. When the direction is described in the following examples, it follows the direction indicated by the arrows.

  In FIG. 1, the body frame 211 of the motorcycle 1 is formed by joining a plurality of steel pipes, for example. 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. And a 216. 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.

  2 to 7 show the engine unit 11. Specifically, FIG. 2 is a view of the engine unit 11 viewed from the left, FIG. 3 is a view of the engine unit 11 viewed from the right, and FIG. 4 is a view of the engine unit 11 viewed from the front. is there. FIG. 5 is a view of the engine unit 11 with the radiator 33 removed as viewed from the front. FIG. 6 is a view of the engine unit 11 as viewed from above. FIG. 7 is a view of the engine unit 11 with the air cleaner 111, the intercooler 117, the surge tank 119, and the like removed, as viewed from above.

  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 exhausts exhaust gas generated by the combustion of the mixture from the engine 12, and cooling that cools the engine 12 and the like 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 FIG. 2, the engine 12 includes a crankcase 13 that houses a crankshaft, a cylinder 14 that is provided on the crankcase 13, a cylinder head 15 that is provided on the cylinder 14, and a cylinder head 15. And a cylinder head cover 16 provided on the top.

  An oil pan 17 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 engine 12 is provided with a balance shaft that reduces vibrations caused by the movement of the piston. The balance shaft is disposed in front of the crankshaft. Specifically, a balancer chamber 18 is integrally formed at the front portion of the crankcase 13 of the engine 12. The balancer chamber 18 is formed by extending a part of the crankcase 13 forward. The balance shaft is provided in the balancer chamber 18. A magneto chamber 19 is provided on the left side of the crankcase 13, and an AC generator 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. As shown in FIG. 3, a clutch cover 22 that covers the clutch is attached to the right portion of the transmission case 21. As shown in FIG. 2, a sprocket cover 23 that covers the drive sprocket is provided on the left side of the transmission case 21. As shown in FIG. 1, a chain 235 that transmits the power of the engine 12 to the rear wheel 233 is wound around the drive sprocket.

  As shown in FIG. 5, 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. The oil cooler 26 cools engine oil supplied to the engine 12 with cooling water. The oil filter 25 and the oil cooler 26 are disposed on the front side of the lower end of the engine 12 so as to protrude forward in the vicinity of the middle in the left-right direction on the front surface of the crankcase 13. Specifically, the oil filter 25 is disposed on the left side of the vehicle (the side where the oil pump is disposed) with respect to the oil cooler 26, and the oil filter 25 and the oil cooler 26 are disposed below the supercharger 113.

  As shown in FIGS. 2, 5, and 6, 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 electronically controlled throttle device 120, and an injector. 123.

  As shown in FIG. 5, the air cleaner 111 is disposed on the upper left side of the engine 12. The air cleaner 111 is a device that filters air taken in from the atmosphere, and an air filter is provided therein. The air cleaner 111 has a suction port 112. 2 and 6, 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 takes air from the atmosphere and guides it to the air cleaner 111.

  As shown in FIG. 5, the supercharger 113 is disposed above the oil cooler 26 in front of the cylinder 14 and the crankcase 13 and below the exhaust port of the engine 12. Further, the supercharger 113 is disposed between the engine 12 (specifically, the cylinder 14 and the crankcase 13) and the radiator 33 in the longitudinal direction of the vehicle. The supercharger 113 is a device that compresses the intake air sucked into the engine 12 using the flow of exhaust discharged from the engine 12. The supercharger 113 includes a turbine unit 114, a bearing unit 116, and a compressor unit 115 in order from the right side of the vehicle.

  The turbine portion 114 is disposed at a substantially central portion in the left-right direction of the engine 12 and is disposed at the same position as the exhaust port of the engine 12 in the left-right direction of the vehicle. The turbine section 114 has a turbine wheel that is rotatably supported in the turbine housing. The turbine wheel is rotationally driven by the flow of exhaust discharged from the engine 12. The compressor unit 115 is disposed on the left side of the turbine unit 114. The compressor unit 115 includes a compressor impeller that is rotatably supported in the compressor housing. The compressor impeller is coaxial with the turbine wheel and rotates together to compress the air supplied via the air cleaner 111. The bearing unit 116 is disposed between the turbine unit 114 and the compressor unit 115. The bearing portion 116 has a bearing 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.

  As shown in FIG. 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 to a high temperature. As shown in FIG. 6, an exhaust duct 118 that discharges air (exhaust air) that has passed through the intercooler 117 to the outside is provided behind the intercooler 117. The surge tank 119 is a device that is disposed behind the air cleaner 111 and above the electronic control throttle device 120 and rectifies the flow of air cooled by the intercooler 117. The air compressed by the compressor unit 115 is introduced to the left side of the intercooler 117, is cooled while flowing through the intercooler 117 from left to right, and flows from the right side of the intercooler 117 to the surge tank 119.

  The electronically controlled throttle device 120 is a device that adjusts the amount of air that passes through the intercooler 117 and the surge tank 119 and is supplied to the intake port of the engine 12. As shown in FIG. 2, the electronically controlled throttle device 120 includes a throttle body 121 and a throttle valve (not shown) that is provided inside the throttle body 121 and opens and closes 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.

  The connection of each part which comprises these intake systems is as follows. As shown in FIG. 5, the air cleaner 111 and the compressor unit 115 of the supercharger 113 are connected by an air intake pipe 125. The air intake pipe 125 extends forward from the air cleaner 111, extends in the vertical direction behind a left tank 34 </ b> B of an upper radiator 34 described later, is bent toward the center of the vehicle, and is connected to the left side surface of the compressor unit 115. Further, the compressor unit 115 and the intercooler 117 are connected by an air outlet pipe 126 formed of a metal pipe having a smaller diameter than the air intake pipe 125. Specifically, the air outlet pipe 126 is connected to the periphery of the compressor unit 115, extends in the vertical direction behind the upper radiator 34, and is connected to the left side of the intercooler 117. The air intake pipe 125 and the air outlet pipe 126 are arranged so as to pass through the left part of the space between the engine 12 and the radiator 33. Further, in the space between the engine 12 and the radiator 33, the air intake pipe 125 is disposed so as to pass on the left side of the air outlet pipe 126. In addition, as shown in FIG. 6, the intercooler 117 and the surge tank 119 are connected by a connecting pipe 127. The connecting pipe 127 is disposed on the right rear side above the engine 12.

  The intake air taken in from the atmosphere is purified by the air cleaner 111, then flows through the air intake pipe 125, flows into the left side center of the compressor unit 115 of the supercharger 113, and is compressed by the compressor unit 115. The compressed intake air flows out from the periphery (upper part) of the compressor unit 115, flows into the left side of the intercooler 117 through the air outlet pipe 126, and is cooled by the intercooler 117. Thereafter, the intake air sequentially flows through the connecting pipe 127, the surge tank 119, and the throttle body 121 of the electronically controlled throttle device 120 into the intake port of the engine 12.

  An air bypass passage 128 that bypasses the compressor 115 and connects the air intake pipe 125 and the air outlet pipe 126 is provided near the supercharger 113 (see FIGS. 2 and 5). An air bypass valve 129 that switches between communication and blocking of the air bypass passage 128 is provided in the middle of the bypass passage 128. The air bypass valve 129 is disposed behind the air intake pipe 125 (see FIGS. 2 and 6).

  As shown in FIG. 5, the exhaust system of the engine unit 11 includes an exhaust pipe 131 connecting the exhaust port of the engine 12 and the turbine part 114 of the supercharger 113, and the turbine part 114 and the muffler side of the supercharger 113. A muffler joint pipe 132, a muffler, and the like are provided.

  The exhaust pipe 131 is disposed in the middle in the left-right direction in the space between the engine 12 and the radiator 33. In the present embodiment, the exhaust pipe 131 is integrally formed with the turbine housing of the turbine portion 114. Specifically, one end side of two exhaust pipes 131 is connected to the two exhaust ports of the parallel two-cylinder engine 12. The other end sides of these exhaust pipes 131 are combined with each other to become one, and are integrated with the turbine housing of the turbine section 114. In other words, the exhaust pipe 131 is connected to two exhaust ports and is formed in a Y shape that collects exhaust from each exhaust port. The exhaust pipe 131 extends downward from the exhaust port and is connected to the periphery of the turbine unit 114. . The exhaust pipe 131 may be configured separately from the turbine housing and connected to the turbine housing. On the other hand, the front end side of the muffler joint pipe 132 is connected to the right side surface of the turbine housing of the turbine section 114 and extends downward, and the rear end side passes through the right side of the oil pan 17 below the engine 12 and toward the muffler. Extends backward. The front end side of the muffler joint pipe 132 is located in the right part of the space between the engine 12 and the radiator 33. The muffler is disposed on the lower rear side of the engine 12.

  Exhaust gas discharged from each exhaust port flows into the turbine unit 114 through the exhaust pipe 131. The turbine of the turbine part 114 rotates by this flow of exhaust. Subsequently, the exhaust gas flowing out from the turbine unit 114 flows into the muffler through the muffler joint pipe 132, and is discharged from the muffler to the outside.

  In addition, a waste gate valve 133 is provided in the turbine unit 114 of the supercharger 113. That is, inside the turbine section 114 is formed a gate that flows a part of the exhaust gas sent through the exhaust pipe 131 to the muffler joint pipe 132 side without supplying it to the turbine. The waste gate valve 133 is The amount of exhaust gas flowing into the turbine is adjusted by opening and closing the gate. The waste gate valve 133 is disposed below the compressor unit 115.

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

  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 of the engine 12. The water pump 30 is disposed at a position corresponding to the balance shaft located in front of the crankshaft. 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 sends cooling water to the engine 12 (water jacket) and the supercharger 113.

  The radiator 33 is disposed in front of the engine 12. The radiator 33 receives the traveling wind or drives the cooling fan device 40 to cool the cooling water by radiating the heat of the cooling water to the atmosphere. The radiator 33 includes an upper radiator 34 and a lower radiator 35. The upper radiator 34 and the lower radiator 35 are spaced apart from each other in the vertical direction. When viewed from the front of the vehicle (see FIG. 4), the supercharger 113 is disposed at a position where it can be seen from between the upper radiator 34 and the lower radiator 35. The traveling wind that has passed between the upper radiator 34 and the lower radiator 35 reaches the supercharger 113 directly.

  As shown in FIG. 4, the upper radiator 34 includes a core 34A having a large number of thin tubes through which cooling water flows and fins for improving the heat dissipation of the cooling water, a left tank 34B provided on the left portion of the core 34A, A right tank 34C provided on the right side of the core 34A.

  A radiator inlet is formed in the upper part of the front surface of the left tank 34B, and a tubular pipe connection nipple 37 is provided at the radiator inlet so as to surround the periphery of the radiator inlet. As shown in FIG. 2, the pipe connection nipple 37 protrudes forward from the front surface of the left tank 34B. As will be described later, a radiator inlet hose 53 is connected to the pipe connection nipple 37.

  Further, as shown in FIG. 3, a radiator outlet is formed in the upper part of the rear surface of the right tank 34C, and a tubular pipe connection nipple 38 is provided at the radiator outlet so as to surround the periphery of the radiator outlet. ing. The pipe connection nipple 38 protrudes rearward from the rear surface of the right tank 34C. As will be described later, a radiator outlet hose 54 is connected to the pipe connection nipple 38.

  A cooling water supply port is formed in the lower part of the rear surface of the right tank 34C, and a cylindrical pipe connection nipple 39 is provided at the cooling water supply port so as to surround the periphery of the cooling water supply port. The pipe connection nipple 39 projects rearward from the rear surface of the right tank 34C. A water injection hose 56 is connected to the pipe connection nipple 39. The water injection hose 56 extends upward, and 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. The cooling water injection part 58 is an opening for replenishing the insufficient cooling water.

  As shown in FIG. 4, the lower radiator 35 includes a core 35 </ b> A having a large number of thin tubes through which cooling water flows and fins for improving the heat dissipation of the cooling water, a left tank 35 </ b> B provided at the left portion of the core 35 </ b> A, A right tank 35C provided on the right side of the core 35A. The width of the lower radiator 35 is set smaller than that of the upper radiator 34.

  The upper radiator 34 and the lower radiator 35 are connected via a pair of left and right connecting hoses 36. Specifically, the connecting hose 36 connects the left tank 34B of the upper radiator 34 and the left tank 35B of the lower radiator 35, and the right tank 34C of the upper radiator 34 and the right tank 35C of the lower radiator 35, respectively. Has been. In addition, a reservoir tank 59 is connected to the radiator 33 via an overflow pipe (not shown) (see FIG. 2). The reservoir tank 59 is disposed at the rear left side of the lower radiator 35.

  A cooling fan device 40 is attached to the rear surface of the upper radiator 34 as shown in FIG. In FIG. 4, the cooling fan device 40 attached to the rear surface of the upper radiator 34 is indicated by a broken line. The cooling fan device 40 includes a fan 40A, and creates cooling air by rotating the fan 40A. According to the cooling fan device 40, the cooling water can be cooled when there is no traveling wind or when the traveling wind is insufficient, such as when the motorcycle 1 is stopped or traveling at a low speed. The cooling fan device 40 is arranged such that the rotation center R of the fan 40A is located on the right side of the middle of the motorcycle 1 in the left-right direction. Note that X in FIG. 4 indicates the position of the center of the motorcycle 1 in the left-right direction.

  The cooling water flow control unit 41 has a function of adjusting the amount of cooling water circulated to the radiator 33 according to the temperature of the cooling water. As shown in FIGS. 5 and 7, the cooling water flow control unit 41 is disposed on the right front side above the cylinder head cover 16 and attached to a part of the engine 12 or the vehicle body frame 211.

  As shown in FIG. 8, the cooling water flow control unit 41 includes a thermostat housing 42 and a thermostat 43. The thermostat housing 42 includes a left housing 42L and a right housing 42R. The thermostat 43 is installed in the right housing 42R.

  A first cooling water inlet 44 is formed on the rear side of the left housing 42L. 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. The first cooling water inlet 44, the second cooling water inlet 45, and the cooling water delivery port 46 are each in communication with the inside of the left housing 42L. A water temperature sensor 50 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. A cooling water outlet 48 is formed on the rear side of the right housing 42R. The cooling water return port 47 and the cooling water outlet 48 communicate with the inside of the right housing 42R, respectively.

  A cooling water bypass passage 49 is formed between the left housing 42L and the right housing 42R. The cooling water bypass passage 49 communicates the inside of the left housing 42L and the inside of the right housing 42R.

  The thermostat 43 is provided for opening and closing the cooling water bypass passage 49 according to the temperature of the cooling water. The thermostat 43 includes a valve seat 43A, a main valve element 43B, a thermo element 43C, and a sub valve element 43D.

  The valve seat 43A is fixed inside the right housing 42R. The main valve body 43B and the sub valve body 43D are fixed to the thermo element 43C. The main valve body 43B is configured to be separated from and seated on the valve seat 43A. The sub valve body 43D is configured to be separated from and seated with respect to the opening edge portion of the cooling water bypass passage 49 (hereinafter also referred to as “sub valve seat 43E”). The thermo element 43C moves the main valve body 43B and the sub valve body 43D in the left-right direction according to the temperature of the cooling water. The main valve body 43B opens and closes the flow path between the cooling water return port 47 and the cooling water outlet 48, and the sub valve body 43D opens and closes the cooling water bypass passage 49.

  The connection of each part which comprises these cooling systems is as follows. As shown in FIGS. 7 and 8, the water jacket outlet 32 and the first cooling water inlet 44 of the cooling water flow control unit 41 are connected by a cylinder outlet hose 52. The cylinder outlet hose 52 extends rightward from an outflow portion 32 of a water jacket provided at the rear portion of the engine 12, and then extends upward on the right side of the engine 12, and then passes below the air cleaner 111 and passes through the engine. The upper side of 12 extends forward and reaches the first cooling water inlet 44 of the cooling water flow control unit 41.

  A radiator inlet hose 53 is connected between the coolant outlet 46 of the coolant flow control unit 41 and the pipe connection nipple 37 (radiator inlet) of the upper radiator 34. The radiator inlet hose 53 is disposed so as to pass from behind the upper radiator 34 to above the upper radiator 34 to reach the front surface of the left tank 34B of the upper radiator 34. That is, as shown in FIG. 7, the radiator inlet hose 53 is formed in a space between the engine 12 and the radiator 33 from the coolant outlet 46 located above the engine 12 and slightly to the right of the middle in the left-right direction. The upper portion extends to the left front and crosses the front of the air intake pipe 125 and the air outlet pipe 126, and then extends to the left front of the upper radiator 34 through the upper left portion of the upper radiator 34. Thereafter, as shown in FIG. 2, the radiator inlet hose 53 is bent downward and then bent rearward to reach a pipe connection nipple 37 provided on the front surface of the left tank 34 </ b> B.

  Further, a radiator outlet hose 54 is connected between the pipe connection nipple 38 (radiator outlet) of the upper radiator 34 and the cooling water return port 47 of the cooling water flow control unit 41. As shown in FIG. 3, the radiator outlet hose 54 extends backward in a space between the engine 12 and the radiator 33 from a pipe connection nipple 38 provided on the upper portion of the rear surface of the right tank 34 </ b> C of the upper radiator 34. After that, it curves upward and then extends upward, reaching the space between the engine 12 and the radiator 33. Thereafter, as shown in FIG. 7, the radiator outlet hose 54 curves to the left and then curves backward to reach the cooling water return port 47 located on the upper right side of the engine 12.

  A water pump inlet hose 55 is connected between the cooling water outlet 48 of the cooling water flow control unit 41 and the pump inlet 31 of the water pump 30. As shown in FIG. 7, the water pump inlet hose 55 extends from the cooling water outlet 48 located on the upper right side of the engine 12 toward the space between the engine 12 and the radiator 33 while being curved. As shown in FIG. 3, the right part of the space between the engine 12 and the radiator 33 extends downward to reach the pump inlet 31 at a position close to the radiator 33.

  The water injection hose 56, the radiator outlet hose 54, and the water pump inlet hose 55 are rubber hoses having a smaller diameter than the air intake pipe 125 and the air outlet pipe 126, and are arranged at the right end of the space between the engine 12 and the radiator 33. Has been. Moreover, each hose 52 and 53 is formed with the synthetic resin etc. which have flexibility, for example.

  The second cooling of the cooling water discharge port 30 </ b> B of the water pump 30 and the oil cooler 26, between the oil cooler 26 and the bearing portion 116 of the supercharger 113, and the second cooling of the bearing portion 116 and the cooling water flow control unit 41. Pipes 62, 63, 64 for flowing cooling water are connected between the water inlet 45.

  The flow of cooling water is as follows. When the engine 12 starts operation and the water pump 30 is started, the cooling water is sent from the water pump 30 (supply unit 30A) to the water jacket of the engine 12 to cool the cylinder 14 and the cylinder head 15. As shown in FIG. 8, the cooling water used for cooling the engine 12 flows into the first cooling water inlet 44 of the cooling water flow control unit 41 through the cylinder outlet hose 52. When the water pump 30 is started, the cooling water is sent from the cooling water discharge port 30 </ b> B of the water pump 30 to the oil cooler 26 through the pipe 62, and then the supercharger from the oil cooler 26 through the pipe 63. 113, and then flows into the second cooling water inlet 45 of the cooling water flow control unit 41 through the pipe 64 from the bearing portion 116. Thereby, the oil cooler 26 and the bearing part 116 are each cooled by the cooling water. Then, the cooling water that has flowed into the first cooling water inlet 44 and the second cooling water inlet 45 of the cooling water flow control unit 41 merges in the left housing 42L.

  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, when the temperature of the cooling water is equal to or lower than a predetermined reference temperature T1 (for example, immediately after the engine 12 is started), the main valve body 43B is seated on the valve seat 43A, and the sub-valve body 43D is the sub-valve seat. Leave 43E. That is, the thermostat 43 fully closes the flow path between the cooling water return port 47 and the cooling water outlet 48 and fully opens the cooling water bypass passage 49. That is, by restricting the outflow from the radiator 33, the inflow to the radiator 33 is limited. At this time, the cooling water flowing in from the cooling water inlets 44 and 45 does not pass through the radiator 33 but flows into the right housing 42R from the left housing 42L through the cooling water bypass passage 49. The cooling water flows from the cooling water outlet 48 through the water pump inlet hose 55 to the pump inlet 31 of the water pump 30. In this way, by regulating the cooling water toward the radiator 33, the engine 12 can be warmed up efficiently.

  When the temperature of the cooling water is higher than the reference temperature T1 and not more than a predetermined reference temperature T2 (T2> T1), the main valve body 43B moves in a direction away from the valve seat 43A as the temperature of the cooling water increases. The auxiliary valve body 43D moves in a direction approaching the auxiliary valve seat 43E. That is, the thermostat 43 increases the area of the flow path between the cooling water return port 47 and the cooling water outlet 48 and decreases the area of the cooling water bypass passage 49 as the temperature of the cooling water increases. At this time, the cooling water flowing in from the cooling water inlets 44 and 45 is divided into a flow toward the radiator 33 and a flow toward the cooling water bypass passage 49 inside the left housing 42L.

  Cooling water from the left housing 42L toward the radiator 33 passes through the radiator inlet hose 53 from the cooling water outlet 46 and flows into the left tank 34B of the upper radiator 34. A part of the cooling water flows from the left tank 34B through the core 34A to the right tank 34C and is cooled by the core 34A during this time. The cooling water that has reached the right tank 34C then passes through the radiator outlet hose 54 and flows into the right housing 42R from the cooling water return port 47. Further, the remaining portion of the cooling water flowing into the left tank 34A of the upper radiator 34 flows into the left tank 35B of the lower radiator 35 through the left connecting hose 36, and passes through the core 35A from the left tank 35B to the right. It flows into the tank 35C and is cooled by the core 35A during that time. The cooling water reaching the right tank 35C flows into the right tank 34C of the upper radiator 34 through the right connecting hose 36, then passes through the radiator outlet hose 54, and passes through the cooling water return port 47 to the right housing 42R. Flows into the interior. On the other hand, the cooling water from the left housing 42L toward the cooling water bypass passage 49 flows into the right housing 42R through the cooling water bypass passage 49 and merges with the cooling water after passing through the radiator 33. The combined cooling water flows from the cooling water outlet 48 through the water pump inlet hose 55 to the pump inlet 31 of the water pump 30.

  As the temperature of the cooling water rises from the reference temperature T1 toward the reference temperature T2, the amount of cooling water flowing in through the radiator 33 increases with respect to the amount of cooling water passing through the cooling water bypass passage 49.

  When the temperature of the cooling water is higher than the reference temperature T2, the main valve body 43B is greatly separated from the valve seat 43A, and the sub valve body 43D is seated on the sub valve seat 43E. That is, 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 flowing into the left housing 42L from the cooling water inlets 44 and 45 does not pass through the cooling water bypass passage 49 but flows into the right housing 42R through the radiator 33, and from the right housing 42R to the water pump. Return to 30.

  Note that the sub valve body 43D and the sub valve seat 43E of the thermostat 43 may be omitted. However, by employing the thermostat 43 having the sub valve body 43D and the like as in the present embodiment, the cooling water bypass passage 49 can be surely fully closed. Thereby, the cooling water in the left housing 42 </ b> L can be flowed toward the radiator 33 without leaking into the cooling water bypass passage 49.

  As described above, according to the motorcycle 1 of the embodiment of the present invention, one end of the radiator inlet hose 53 is connected to the front surface of the left tank 34B of the upper radiator 34, whereby the radiator inlet hose 53 is connected to the engine. 12 and the radiator 33 can be arranged so as to pass outside the space, specifically above the space. Thereby, an empty space is created in the left part of the space between the engine 12 and the radiator 33. In arranging the air intake pipe 125 and the air outlet pipe 126, the use of this empty space increases the degree of freedom in arranging these pipes. Therefore, by arranging the air intake pipe 125 and the air outlet pipe 126 using this empty space, it is possible to reduce the respective curved portions of these pipes, and to reduce the degree of bending. The length can be shortened or the pipe diameter can be increased. Therefore, the pressure loss of the intake air flowing through each of the air intake pipe 125 and the air outlet pipe 126 can be reduced.

  Moreover, the distance between the engine 12 and the radiator 33 can be reduced by arranging the air intake pipe 125 and the air outlet pipe 126 using the empty space. In this way, by arranging the two heavy objects such as the engine 12 and the radiator 33 close to each other, the mass can be concentrated and the motion performance of the motorcycle 1 can be improved.

  Further, by connecting the radiator inlet hose 53 to the front surface of the left tank 34B, the layout of the radiator inlet hose 53 is facilitated as compared with the case where the radiator inlet hose 53 is connected to the upper surface of the left tank 34B.

  Further, according to the motorcycle 1 of the embodiment of the present invention, the air intake pipe 125 is disposed on the left side (outside the vehicle) of the air outlet pipe 126 in the left part of the space between the engine 12 and the radiator 33. From the exhaust system parts arranged in the middle or right part of the space between the engine 12 and the radiator 33, that is, the turbine part 114, the exhaust pipe 131 and the muffler joint pipe 132 of the supercharger 113. The air intake pipe 125 can be disposed at a remote position. Thereby, it is possible to suppress the intake air flowing through the air intake pipe 125 from being heated by the heat of the exhaust flowing through the exhaust system components.

  Further, by adopting a configuration in which the air intake pipe 125 is disposed on the left side of the air outlet pipe 126, the air outlet pipe 126 is disposed between the exhaust system component and the air intake pipe 125. Therefore, the air outlet pipe 126 can function as a heat shielding member, and the air outlet pipe 126 can block heat from the exhaust system component toward the air intake pipe 125. Also by this, it is possible to suppress the intake air flowing through the air intake pipe 125 from being heated by the heat of the exhaust gas flowing through the exhaust system components. A heat insulating member is wound around the exhaust pipe 131 in the air outlet pipe 126.

  Further, since the air intake pipe 125 is arranged on the left side of the air outlet pipe 126 in the left part of the space between the engine 12 and the radiator 33, the air intake pipe 125 is connected to the left outer side of the motorcycle 1. It can arrange | position in the place where it is easy to hit. Therefore, the intake air flowing through the air intake pipe 125 can be cooled by the traveling wind. In the motorcycle 1 according to the embodiment of the present invention, as shown in FIG. 4, the air intake pipe 125 is disposed so as to partially protrude from the radiator 33 to the side.

  Further, according to the motorcycle 1 of the embodiment of the present invention, the radiator inlet hose 53 is arranged so as to pass from the rear of the upper radiator 34 to above the upper radiator 34 to reach the front surface of the upper radiator 34. Therefore, the radiator inlet hose 53 can be easily disposed so as to pass above the space between the engine 12 and the radiator 33. Thereby, it becomes possible to arrange these pipes and hoses easily so that each of the air intake pipe 125 and the air outlet pipe 126 and the radiator inlet hose 53 do not interfere with each other.

  Further, according to the motorcycle 1 of the embodiment of the present invention, the pipe connection nipple 37 of the left tank 34B of the upper radiator 34 is provided so as to protrude forward from the front surface of the left tank 34B. Can be connected to the front surface of the left tank 34B, and it is possible to easily secure an empty space between the engine 12 and the radiator 33.

  Further, according to the motorcycle 1 of the embodiment of the present invention, the cooling fan device 40 is arranged so that the rotation center R of the fan 40A is located on the right side of the middle of the motorcycle 1 in the left-right direction. Not only the radiator 33 but also the exhaust system components can be cooled by the cooling air generated by the fan device 40. Therefore, the exhaust system parts can be cooled when there is no running wind or when there is no running wind, such as when the vehicle is stopped or at a low speed. The cooling air that has passed through the radiator 33 flows in a space on the right side that has more space than the left side, and is discharged mainly between the engine 12 and the radiator 33 to the right side.

  In the above-described embodiment, components such as an intake system, an exhaust system, and a cooling system may be arranged in the opposite direction.

  In the above-described embodiment, the case where the radiator inlet hose 53 is connected to the front surface of the radiator 33 is taken as an example, but the present invention is not limited to this. When the radiator outlet hose 54 is arranged on the side where the air intake pipe 125 and the air outlet pipe 126 are arranged in the left-right direction, the radiator outlet hose 54 is connected to the front surface of the radiator 33. Also good.

  In the above-described embodiment, the two-stage radiator 33 having the upper radiator 34 and the lower radiator 35 is employed. However, a single-stage radiator having only the upper radiator 34 may be employed. In the above-described embodiment, the radiator 33 that flows cooling water in the left-right direction is used. However, a radiator that flows cooling water in the vertical direction can also be used.

  The present invention can be applied not only to motorcycles but also to motor tricycles, buggy cars, and the like.

  Further, the correspondence relationship between the configuration in the above-described embodiment and the configuration described in the claims is as follows. Only those whose names differ greatly between the two configurations will be described. The water pump 30 is a specific example of a pump in the claims. The radiator inlet hose 53 is a specific example of the first cooling water pipe in the claims. The radiator outlet hose 54 is a specific example of the second cooling water pipe in the claims. The path formed by the air intake pipe 125 and the air outlet pipe 126 is a specific example of the intake path in the claims. The path formed by the exhaust pipe 131 and the muffler joint pipe 132 is a specific example of the exhaust path in the claims. The air intake pipe 125 is a specific example of the air intake pipe in the claims. The air outlet pipe 126 is a specific example of the air outlet pipe in the claims. The pipe connection nipple 37 is a specific example of the pipe connection portion in the claims.

  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 Motorcycle (saddle-ride type vehicle)
12 Engine 30 Water pump (pump)
33 Radiator 34 Upper radiator 34A Core 34B Left tank 34C Right tank 37 Piping connection nipple (piping connection)
40 Cooling fan device 40A Fan 53 Radiator inlet hose (first cooling water piping)
54 Radiator outlet hose (second cooling water piping)
113 Turbocharger 125 Air intake pipe (intake path, air intake pipe)
126 Air outlet pipe (intake path, air outlet piping)
131 Exhaust pipe (exhaust route)
132 Muffler joint pipe (exhaust path)
R center of rotation

Claims (5)

A water-cooled engine,
A radiator provided in front of the engine for dissipating heat of cooling water;
A pump attached to the engine for circulating cooling water in the engine and the radiator;
A first cooling water pipe for flowing cooling water flowing out of the engine to the radiator;
A second cooling water pipe for flowing cooling water flowing out of the radiator to the pump;
A turbocharger that is provided in front of the engine and compresses intake air sucked into the engine using a flow of exhaust discharged from the engine;
An intake path that guides intake air taken from the atmosphere to the supercharger and guides intake air compressed by the supercharger to the engine;
An exhaust path for guiding the exhaust discharged from the engine to the supercharger and flowing the exhaust discharged from the supercharger to the muffler side,
The intake path is disposed so as to pass through a portion on one side in the left-right direction of the saddle riding type vehicle in a space between the engine and the radiator,
Of the first cooling water pipe and the second cooling water pipe, one end of the cooling water pipe passing through the one side in the lateral direction of the saddle riding type vehicle is connected to the front surface of the radiator. A straddle-type vehicle. The intake path has an air intake pipe that guides intake air taken from the atmosphere to the supercharger, and an air outlet pipe that guides intake air compressed by the supercharger to the engine,
The air intake pipe and the air outlet pipe are both arranged so as to pass through the one side portion of the straddle-type vehicle in the left-right direction in the space between the engine and the radiator,
The said air intake piping is arrange | positioned so that it may pass through the said one side of the said saddle riding type vehicle rather than an air outlet piping in the space between the said engine and the said radiator. The straddle-type vehicle according to 1.   The cooling water pipe passing through the one side in the left-right direction of the saddle riding type vehicle passes from the rear of the radiator to the top of the radiator to reach the front of the radiator. The saddle riding type vehicle described in 1. The radiator has a core and a pair of tanks provided on both sides of the core,
Each of the pair of tanks has a pipe connection part for connecting a pipe,
The first cooling water pipe and the second cooling water pipe are respectively connected to the pipe connection portions of the pair of tanks,
Among the pair of tanks, in the tank to which the cooling water pipe passing through the one side in the left-right direction of the saddle-ride type vehicle is connected, the pipe connection portion protrudes forward from the front surface of the tank. The saddle riding type vehicle according to any one of claims 1 to 3. The radiator is provided with a cooling fan device for cooling the radiator,
The exhaust path is disposed so as to pass through a middle or other side portion of the saddle riding type vehicle in a space between the engine and the radiator,
5. The cooling fan device according to claim 1, wherein the cooling fan device is disposed such that a rotation center of the fan of the cooling fan device is positioned on the other side in the lateral direction of the saddle riding type vehicle. The saddle riding type vehicle described in 1.

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