JP7006240B2 - Water pump placement structure - Google Patents

Description

The present invention relates to an arrangement structure of a water pump.

Conventionally, in a motorcycle provided with a water-cooled engine, a water pump is provided to send cooling water into the engine (see, for example, Patent Document 1). The motorcycle of Patent Document 1 is a large scooter vehicle, and includes a unit swing type engine in which an engine and a swing arm are integrated. In Patent Document 1, the balancer shaft is arranged in the front lower part of the crank shaft, and the pump shaft is arranged further in the front lower part of the balancer shaft. The pump shaft extends in the vehicle width direction, and the rotation of the crank shaft is transmitted to the pump shaft via the balancer shaft. An oil pump is provided at one end (right end) of the pump shaft, and a water pump is provided at the other end (left end) of the pump shaft. That is, the water pump is provided coaxially with the oil pump.

Japanese Patent No. 3970903

However, since the water pump for cooling water is provided coaxially with the oil pump as described above, the location of the water pump is limited. In particular, in a scooter vehicle in which the cylinder is arranged substantially horizontally from the crankcase, the position of the water pump has been a cause of affecting the bank angle and the minimum ground clearance. Further, depending on the location of the water pump, there is a problem that air is accumulated in the water pump when the cooling water is injected, which affects the cooling performance.

The present invention has been made in view of the above points, and an object of the present invention is to provide a water pump arrangement structure capable of realizing cooling performance suitable for an engine state while ensuring a minimum ground clearance and a bank angle. do.

One aspect of the present invention includes an engine having a cylinder , a cylinder head, and a cylinder head cover extending diagonally forward and upward from the crank case, a cooling fan provided at the end of the crank shaft, and the cooling fan in the axial direction of the crank shaft. It is an arrangement structure of a water pump of a motorcycle provided with a radiator arranged on the outside of the engine and a water pump for sending cooling water to the engine, and the water pump is provided separately from the engine and driven. An electric pump having a motor, at least a part thereof is arranged so as to overlap the cylinder head in the vehicle side view of the motorcycle, and the drive motor of the water pump is the radiator and the drive motor in the vehicle side view. The water pump, which is arranged above the crank shaft between the cylinder head covers, has an impeller provided at the shaft end of the drive motor, and a case for accommodating the drive motor and the impeller, and the case. Is arranged with the side in which the impeller is housed facing downward in the vehicle, the axial direction of the impeller and the drive motor is directed in the vertical direction of the vehicle, and the shafts of the impeller and the drive motor are viewed from the cylinder and the vehicle side. It is characterized by overlapping with.

According to the present invention, it is possible to realize cooling performance suitable for the engine state while ensuring the minimum ground clearance and the bank angle.

It is a right side view which shows the schematic structure of the motorcycle which concerns on this embodiment. It is a right side view which shows the peripheral structure of an engine. It is the figure which omitted the radiator cover of FIG. It is the figure which omitted the radiator of FIG. It is a top view of the engine shown in FIG. It is a front view of the engine shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the present invention is applied to a scooter type motorcycle will be described, but the application target is not limited to this and can be changed. For example, the present invention may be applied to other types of motorcycles, buggy type motorcycles, motorcycles, and the like. Further, regarding the direction, the front of the vehicle is indicated by an arrow FR, the rear of the vehicle is indicated by an arrow RE, the upper portion of the vehicle is indicated by an arrow UP, the lower portion of the vehicle is indicated by an arrow LO, the left direction of the vehicle is indicated by an arrow L, and the right direction of the vehicle is indicated by an arrow R. Further, in each of the following figures, some configurations are omitted for convenience of explanation.

A schematic configuration of the motorcycle according to the present embodiment will be described with reference to FIG. 1. FIG. 1 is a right side view showing a schematic configuration of a motorcycle according to the present embodiment.

As shown in FIG. 1, the small scooter type motorcycle 1 is configured by suspending the engine 2 on an underbone type body frame (not shown). The engine 2 is composed of, for example, a single cylinder engine. In particular, in the present embodiment, a unit swing type engine in which the transmission mechanism to the engine 2, the transmission (CVT unit or the like described later) and the rear wheel 26 is integrated with the swing arm is adopted.

Various covers as the exterior of the vehicle body are attached to the vehicle body frame and the engine 2. Specifically, on the front side of the vehicle, a leg shield 11 that protects the driver's undercarriage is provided in front of the vehicle. A center frame cover 12 is provided behind the leg shield 11. A footboard 13 extending rearward is provided at the lower end of the center frame cover 12. A side frame cover 14 that covers the side surface of the vehicle is provided behind the footboard 13.

A front fork 15 is rotatably supported in front of the vehicle via a steering shaft (not shown). Above the front fork 15, a handlebar 17 for steering the front wheels 16 is provided. A front wheel 16 is rotatably supported under the front fork 15.

A seat 18 is provided on the upper side of the side frame cover 14. A rear fender 19 is provided at the rear of the side frame cover 14. The engine 2 as an internal combustion engine is arranged from the inside to the rear of the side frame cover 14.

The engine 2 extends back and forth behind the footboard 13. The front end portion of the engine 2 is connected to the vehicle body frame, and the entire engine 2 can swing up and down with the connecting portion as a fulcrum. A rear wheel 26 is rotatably provided at the rear end of the engine 2.

An exhaust pipe 30 and a muffler 31 are connected to the exhaust port of the engine 2 as an exhaust system. The exhaust pipe 30 extends below the engine 2 toward the rear. The muffler 31 is connected to the rear end of the exhaust pipe 30 and is arranged so as to overlap the rear wheel 26 in a side view. The sides of the muffler 31 are covered by the muffler cover 32.

Next, the engine and its peripheral configuration according to the present embodiment will be described with reference to FIGS. 2 to 6. FIG. 2 is a right side view showing the peripheral configuration of the engine. FIG. 3 is a diagram in which the radiator cover of FIG. 2 is omitted. FIG. 4 is a diagram in which the radiator of FIG. 3 is omitted. FIG. 5 is a top view of the engine shown in FIG. FIG. 6 is a front view of the engine shown in FIG.

As described above, the engine 2 according to the present embodiment is composed of a unit swing type engine adopted in the scooter type motorcycle 1 (see FIG. 1). The engine 2 includes a crankcase 20 in which various components such as a crank shaft (not shown) are housed, a cylinder 21 and a cylinder head 22 extending diagonally upward from the crankcase 20, and a cylinder provided in front of the cylinder head 22. The head cover 23 and the like are included. The cylinder 21 is arranged so as to be tilted so that the axis line faces in the substantially horizontal direction.

Specifically, the axis of the cylinder 21 is directed in a direction (substantially horizontal direction) in which the front side (cylinder head cover 23 side) is slightly higher than the horizontal direction. That is, the horizontal direction in the present embodiment does not mean only the complete horizontal direction, but is a concept having a predetermined width within a range that does not deviate from the gist of the present invention.

The cylinder 21 is attached to the front portion of the crankcase 20. A columnar bore (combustion chamber) for accommodating the piston is formed inside the cylinder 21 (both not shown). The cylinder head 22 is attached to the front portion of the cylinder 21. The cylinder head 22 is formed with an intake port and an exhaust port (both not shown) communicating with the combustion chamber. The intake port is provided on the upper surface side of the cylinder head 22, and the exhaust port is provided on the lower surface side of the cylinder head 22.

The cylinder head cover 23 is attached to the front portion of the cylinder 21 and serves to cover the cylinder 21. Inside the cylinder head cover 23, a valve operating mechanism (not shown) for opening and closing an intake / exhaust valve (not shown) is housed.

The crankcase 20 is configured by connecting the left and right case 24 and the right case 25, which are split left and right, with bolts or the like. The mating surface of the left case 24 and the right case 25 passes through the center of the cylinder axis. A crankshaft is housed in the crankcase 20, and the crankshaft is arranged so that the axial direction is horizontal in the vehicle width direction.

In particular, the left case 24 extends rearward, and the rear wheel 26 is rotatably attached to the rear end. That is, the left case 24 constitutes a swing arm that cantileverly supports the rear wheel 26. The left side surface of the left case 24 is open, and various gears for transmitting power are housed side by side in the front and rear. A speed change gear case (not shown) is attached to the left side of the left case 24, and the opening of the left case 24 is closed.

A CVT unit (not shown) as a transmission is provided on the left side (left case 24) of the crankcase 20. The CVT unit is a so-called belt-type continuously variable transmission, and includes a drive pulley (not shown) provided on the left end side of the crank shaft. A belt (not shown) is wound around the drive pulley, and shifting is realized by changing the winding radius of the belt.

An electric motor (not shown) as a generator is provided on the right side (right case 25) of the crankcase 20. The motor includes a magneto (not shown) provided on the right end side of the crank shaft. A cooling fan 5 for cooling the radiator 4, which will be described later, is provided on the right side of the magneto. The cooling fan 5 is fixed to the right end of the crank shaft and rotates with the rotation of the crank shaft to generate cooling air.

A radiator 4 is provided via a radiator case 6 on the outside of the cooling fan 5, that is, on the right side of the cooling fan 5 in the axial direction of the crank shaft. The radiator case 6 has a square shape in a side view, and a circular opening 60 is formed in a central portion corresponding to the cooling fan 5. The circular opening 60 constitutes an inlet for cooling air to the radiator 4.

The radiator 4 has a square shape in a side view as a whole, and the upper tank 40 and the lower tank 41 are opposed to each other in the vertical direction, and the upper tank 40 and the lower tank 41 are connected by a radiator core 42. The upper tank 40 is located on the upper side of the vehicle, and the lower tank 41 is located on the lower side of the vehicle. A part of the upper tank 40 is raised upward, and a radiator cap 43 is attached to the upper end portion thereof. Further, the radiator core 42 is arranged to face the cooling fan 5 and the circular opening 60 so as to receive the cooling air from the cooling fan 5. The cooling water flowing in the radiator 4 is cooled by the cooling air passing through the radiator core 42. The radiator 4 is covered by the radiator cover 61. The piping system connected to the radiator 4 will be described later.

An air cleaner 29 is connected to the intake port of the engine 2 via the throttle body 28. The throttle body 28 and the air cleaner 29 are arranged in the space above the engine 2. A muffler 31 is connected to the exhaust port of the engine 2 via an exhaust pipe 30. The exhaust pipe 30 protrudes downward from the exhaust port, bends to the right, and then extends toward the rear of the engine. The muffler 31 is connected to the rear end of the exhaust pipe 30. The muffler 31 is arranged on the right side of the rear wheel 26. The exhaust gas generated by the combustion of the engine 2 is muted by the muffler 31 from the exhaust port through the exhaust pipe 30, and then discharged to the outside.

By the way, in a water-cooled engine of a motorcycle, a water pump for circulating cooling water is provided. The water pump takes out a part of the driving force (rotational force of the crank shaft) of the engine and is rotationally driven. For example, the driving force is transmitted from the crank shaft to the water pump via a transmission mechanism such as a gear or a chain. Therefore, there are restrictions on the location of the water pump.

In particular, in a scooter vehicle, the water pump is more than a cylinder and a cylinder head in order to prevent air from accumulating inside and causing the pump itself to be idle (push out air) when cooling water is injected. Must be placed in a low position. As a result, the position of the water pump was a factor that affected the minimum ground clearance of the vehicle.

Further, as described above, the water-cooled engine is provided with a radiator in order to cool the cooling water that has flowed inside the engine and has been warmed up. For example, in a water-cooled scooter vehicle, a cooling fan is provided at the shaft end of the crank shaft, and a radiator is arranged outside the cooling fan. The radiator cools the cooling water in the core by receiving the cooling air generated by the cooling fan.

However, when the cooling fan is provided at the shaft end of the crank shaft, the rotation of the cooling fan depends on the rotation speed of the engine (crank shaft). That is, the cooling fan is always operated while the engine is being driven, and the cooling air passes through the radiator. In particular, since the cooling air increases in proportion to the engine speed, it is not possible to finely control the water temperature, and it is difficult to satisfy the cooling performance according to the operating conditions.

For example, even in a situation where cooling is not required, the cooling air generated by the cooling fan passes through the radiator, so that overcooling is likely to occur. Specifically, since the radiator works even in the idling state during cold cooling, there is a difficulty in warming up performance. As a result, combustion becomes unstable, which may affect fuel efficiency.

In addition, the engine is most likely to reach a high temperature when it is left idle after maximum load operation. At this time, the engine speed drops to the idle speed, and the work of the cooling fan also drops. That is, the driving amount of the cooling fan is reduced even though the engine is to be positively cooled. As a result, sufficient cooling performance may not be obtained. In this case, in order to sufficiently satisfy the cooling performance of the radiator, it is necessary to increase the size of the radiator itself. However, if the radiator itself is enlarged, the warm-up performance will be sacrificed as described above. In this way, the cooling performance and the warm-up performance conflict with each other, and it is difficult to balance them.

Therefore, the inventors of the present invention came up with the present invention in view of these circumstances. Specifically, in the present embodiment, an electric pump is adopted as the water pump 7 that sends the cooling water to the engine 2, and the water pump 7 is arranged independently of the engine 2. By adopting the electric pump, it is possible to freely control the drive of the water pump 7 without depending on the drive state (engine speed) of the engine 2.

For example, in the warm-up state immediately after the engine is started, it is possible to reduce the cooling efficiency of the radiator 4 and improve the warm-up performance by reducing the drive amount of the water pump 7. On the other hand, in the idle state after the maximum load operation of the engine, it is possible to increase the cooling efficiency of the radiator 4 and improve the cooling performance by increasing the driving amount of the water pump 7. In this way, it is possible to flexibly control the cooling performance according to the driving state of the engine 2. Therefore, it is possible to reduce the configurations of the thermostat, hose, clip, etc., which are required in the conventional configuration.

Further, by adopting the electric pump, it becomes possible to arrange the water pump 7 independently (separately) from the main body portion of the engine 2 (crankcase 20, cylinder 21, cylinder head 22, etc.). The degree of freedom of placement can be improved. In particular, in the present embodiment, at least a part of the water pump 7 is arranged so as to overlap the cylinder head 22 in the side view of the engine 2. More specifically, the water pump 7 is arranged between the radiator 4 and the cylinder head cover 23 at the same height as the crank shaft or above the crank shaft in the side view of the engine 2.

According to this configuration, the water pump 7 can be arranged at a higher position than before. Further, by arranging the water pump 7 apart from the engine 2, the crankcase 20 can be miniaturized. These make it easier to secure the minimum ground clearance and bank angle of the vehicle.

Further, in the present embodiment, the cooling fan 5 is provided at the shaft end of the crank shaft, and the radiator 4 is arranged further outside the cooling fan 5. Therefore, the engine 2 (crankcase 20 and the like) protrudes in the vehicle width direction (right side) by the amount of the cooling fan 5 and the radiator 4. Therefore, the space in front of the cooling fan 5 and the radiator 4, that is, the space to the right of the cylinder 21 and the cylinder head 22 is an extra space. By arranging the water pump 7 in the surplus space, it is possible to effectively utilize the surplus space.

Next, the detailed configuration of the water pump 7 and its arrangement structure will be described in detail. As shown in FIGS. 2 to 6, the water pump 7 is configured by accommodating the drive motor 71 and the impeller 72 in a case 70 having a cylindrical outer shape.

The case 70 is composed of an upper half portion 73 in which the drive motor 71 is housed and a lower half portion 74 in which the impeller 72 is housed. The upper half portion 73 and the lower half portion 74 have a bottomed cylindrical shape, and one case 70 is configured by connecting the opening portions so as to face each other. The mating portion of the upper half portion 73 and the lower half portion 74 is a ring-shaped flange portion (not shown) protruding in the radial direction. The flange portion is covered with a ring-shaped rubber member 75. The case 70 is arranged within the vertical width of the radiator core 42 in the side view shown in FIG.

The water pump 7 is float-supported by attaching the plate-shaped bracket 76 to the rubber member 75 and fixing the bracket 76 to, for example, the radiator case 6. The rubber member 75 suppresses vibration transmission to the main body portion of the water pump 7, and prevents the generation of air bubbles inside the case 70. The water pump 7 is not limited to the case where it is fixed to the radiator case 6, but may be fixed to the peripheral configuration of the water pump 7 such as the crankcase 20 and the radiator cover 61.

In the drive motor 71, the rotating shaft (not shown) extends in the vertical direction (vertical direction) of the engine 2, the main body portion including the coil and the like is directed upward, and the tip end side of the rotating shaft is directed downward. The impeller 72 is attached to the tip (lower end) of the rotating shaft. As described above, the main body portion of the drive motor 71 is housed in the upper half portion 73, and the impeller 72 is housed in the lower half portion 74.

A nipple 77 projecting downward is formed in the center of the lower surface of the lower half portion 74. The downstream end of the radiator outlet hose 78 that introduces the cooling water from the radiator 4 into the water pump 7 is connected to the nipple 77. That is, the nipple 77 constitutes a cooling water inlet for the water pump 7. The upstream end of the radiator outlet hose 78 is connected to the front end portion of the lower tank 41. The radiator outlet hose 78 is bent in a substantially L-shape in a side view from the front end of the lower tank 41 toward the cooling water inlet.

Further, a nipple 79 projecting to the left (cylinder 21 side) is formed on the left side surface (cylindrical surface) of the lower half portion 74. The upstream end of the pump outlet hose 80 that introduces the cooling water from the water pump 7 into the engine 2 (cylinder 21) is connected to the nipple 79. That is, the nipple 79 constitutes a cooling water outlet for the water pump 7. The downstream end of the pump outlet hose 80 is connected to the side surface of the cylinder 21 facing the nipple 79.

A water jacket (not shown) is formed on the cylinder 21 and the cylinder head 22 constituting the combustion chamber. The cooling water sent from the water pump 7 into the engine 2 cools the engine 2 by passing through the water jacket. The outlet (downstream end) of the water jacket is formed on the right side surface of the cylinder head 22 (not shown).

The upstream end of the radiator inlet hose 82 is connected to the outlet of the water jacket via the connector 81. The radiator inlet hose 82 is a pipe for introducing the cooling water flowing through the water jacket into the radiator 4. The downstream end of the radiator inlet hose 82 is connected to the raised portion of the upper tank 40. Further, a water temperature sensor 83 for detecting the cooling water temperature immediately after flowing in the engine 2 is attached to the connector 81.

In the cooling structure of the engine 2 configured in this way, the cooling water pumped up by the water pump 7 is sent to the engine 2 (cylinder 21) through the pump outlet hose 80. The cooling water passes through the water jacket described above and is warmed, and then flows into the radiator 4 (upper tank 40) from the right side surface of the cylinder head 22 through the radiator inlet hose 82. Then, the cooling water is heat-exchanged and cooled as it flows through the radiator core 42, and then flows from the lower tank 41 into the water pump 7 again through the radiator outlet hose 78. In this way, the cooling water is circulated.

In the present embodiment, the water pump 7 (case 70) is arranged so as to overlap the radiator core 42 in the front view shown in FIG. That is, by arranging the water pump 7 away from the engine 2, it is possible to prevent the water pump 7 from directly receiving the heat from the engine 2. Further, by creating a gap between the engine 2 and the water pump 7, it is possible to reduce the sudden bending of the various hoses described above, and it is possible to reduce the pressure loss of the cooling water. Further, by reducing the sudden bending of various hoses, the hose length can be shortened (connected in the shortest time), so that the weight of the hose itself and the weight of the cooling water flowing in the hose can be reduced.

Further, in the water pump 7, the upper half portion 73 on the drive motor 71 side is directed above the engine 2, and the lower half portion 74 on the impeller 72 side is directed below the engine 2. Further, the axial direction of the impeller 72 (drive motor 71) is directed to the vertical direction of the engine 2. By directing the drive motor 71 side upward, it is possible to arrange the coupler 71a for the harness with respect to the drive motor 71 on the upper side of the water pump 7. As a result, the harness can be shortened. Further, by arranging the coupler 71a above the water pump 7, it is possible to suppress the infiltration of water into the coupler 71a and the accumulation of liquid.

The nipple 79 (cooling water outlet) is located above the nipple 77 (cooling water inlet). Therefore, air bleeding when injecting the cooling water into the water pump 7 is promoted, and it is possible to avoid a cooling impossible state due to an air pool. Further, by providing the nipple 77 on the lower surface of the lower half portion 74 and providing the nipple 79 on the side surface of the lower half portion 74, the water pump 7 is arranged at a position as high as possible while considering the above-mentioned air bleeding property. It is possible.

Further, the radiator outlet hose 78 and the pump outlet hose 80 connected to the nipples 77 and 79, respectively, are located below the upper end of the upper half portion 73 and behind the front end of the case 70. As a result, the piping parts can be compactly stored in the arrangement space of the water pump 7.

In particular, the nipple 77 is directed toward the lower tank 41 below, and the nipple 79 is provided at a position facing the right side surface of the cylinder 21. Further, the outlet of the water jacket is located at the upper right portion of the cylinder head 22. Therefore, the lower tank 41 and the water pump 7, the water pump 7, the cylinder 21, the cylinder, and the upper tank 40 can be connected at the shortest distance, respectively. Therefore, it is possible to shorten the radiator outlet hose 78, the pump outlet hose 80, and the radiator inlet hose 82.

As described above, in the present embodiment, the water pump 7 is provided in a so-called side radiator type scooter vehicle in which the cooling fan 5 is arranged at the shaft end of the crank shaft and the radiator 4 is arranged outside the cooling fan 5. Was electrically operated and placed in front of the radiator 4. As a result, it is possible to realize cooling performance suitable for the engine condition while ensuring the minimum ground clearance and bank angle.

In the above embodiment, the case where the cooling fan 5, the radiator 4, and the water pump 7 are arranged on the right side of the engine 2 has been described, but the present invention is not limited to this. The cooling fan 5, the radiator 4, and the water pump 7 may be arranged, for example, on the left side of the engine 2.

Further, in the above embodiment, the unit swing type engine 2 has been described as an example, but the present invention is not limited to this configuration. The engine may be another type of engine in which the crankcase and the swing arm are made of separate parts.

Further, in the above embodiment, the axial direction of the water pump 7 (impeller 72) is oriented in the vertical direction, but the configuration is not limited to this. The axial direction of the impeller 72 may be inclined in any direction.

Further, in the above embodiment, the lower end of the lower half portion 74 is located above the center of the crank shaft in the side view, but the configuration is not limited to this. The case 70 may be at the same height as the crank shaft, that is, the case 70 and the center of the crank shaft may be in a positional relationship in which they overlap in a front view.

Moreover, although the present embodiment and the modified example have been described, as another embodiment of the present invention, the above-described embodiment and the modified example may be combined in whole or in part.

Further, the embodiment of the present invention is not limited to the above-described embodiment, and may be variously modified, replaced, or modified without departing from the spirit of the technical idea of the present invention. Further, if the technical idea of the present invention can be realized in another way by the advancement of the technology or another technology derived from it, it may be carried out by the method. Therefore, the scope of claims covers all embodiments that may be included within the scope of the technical idea of the present invention.

As described above, the present invention has the effect of being able to realize cooling performance suitable for the engine state while ensuring the minimum ground clearance and bank angle, and is particularly useful for the arrangement structure of the water pump. be.

1: Motorcycle 2: Engine 4: Radiator 5: Cooling fan 6: Radiator case 7: Water pump 20: Crankcase 21: Cylinder 22: Cylinder head 23: Cylinder head cover 24: Left case 25: Right case 40: Upper tank 41: Lower tank 42: Radiator core 70: Case 71: Drive motor 72: Impeller 73: Upper half 74: Lower half 76: Bracket 77: Nipple (cooling water inlet)
78: Radiator outlet hose (hose)
79: Nipple (cooling water outlet)
80: Pump outlet hose (hose)
82: Radiator inlet hose (hose)

Claims (3)

An engine with a cylinder , cylinder head and cylinder head cover that extends diagonally forward and upward from the crankcase.
A cooling fan installed at the end of the crank shaft,
A radiator arranged outside the cooling fan in the axial direction of the crank shaft,
It is an arrangement structure of a water pump of a motorcycle equipped with a water pump that sends cooling water to the engine.
The water pump is an electric pump provided apart from the engine and having a drive motor, and at least a part thereof is arranged so as to overlap the cylinder head in the vehicle side view of the motorcycle .
In a vehicle side view, the drive motor of the water pump is located above the crank shaft between the radiator and the cylinder head cover.
The water pump
An impeller provided at the shaft end of the drive motor and
It has a drive motor and a case for accommodating the impeller.
The case is arranged so that the side in which the impeller is housed faces the lower side of the vehicle.
An arrangement structure of a water pump, characterized in that the axial direction of the impeller and the drive motor is directed in the vertical direction of the vehicle, and the shafts of the impeller and the drive motor overlap the cylinder in a side view of the vehicle . The water pump arrangement structure according to claim 1 , wherein the drive motor of the water pump is arranged so as to overlap with the radiator core of the radiator when viewed from the front of the vehicle . The case has a cooling water inlet and a cooling water outlet.
The cooling water outlet is provided on the inner side surface of the vehicle of the case, and is located above the cooling water inlet of the vehicle .
The cooling water inlet is provided on the lower surface of the case.
The radiator has a lower tank connected to the lower part of the radiator core, and the lower tank is located behind the vehicle and below the vehicle with respect to the case.
The radiator outlet hose that introduces the cooling water from the radiator into the water pump is connected to the front end of the lower tank and the cooling water inlet, and is substantially L-shaped in a vehicle side view from the front end of the lower tank toward the cooling water inlet. It is bent like a shape and is provided.
The pump outlet hose that introduces the cooling water from the water pump into the cylinder is connected to the cooling water outlet and the side surface of the cylinder, and is substantially from the cooling water outlet toward the side surface of the cylinder facing the cylinder in front view of the vehicle. The arrangement structure of the water pump according to claim 2 , wherein the water pump is provided in a linear shape .

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