JP2019108870A - Arrangement structure of water pump - Google Patents

Abstract

To obtain cooling performance suitable for an engine state while securing the lowest ground height and a bank angle.SOLUTION: This arrangement structure of a water pump comprises: an engine (2) having a cylinder (21) which extends frontward, obliquely and upward from a crank case (20), and a cylinder head (22); a cooling fan (5) arranged at an end part of a crankshaft; a radiator (4) arranged outside the cooling fan in an axial direction of the crankshaft; and a water pump (7) for sending cooling water into the engine. The water pump is an electric pump having a drive motor, and at least a part of the water pump is overlapped on the cylinder head in a side face view of the engine, and arranged apart from the engine.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water pump arrangement structure.

  Conventionally, in a motorcycle equipped with a water-cooled engine, a water pump is provided to feed 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 disposed in front of and below the crankshaft, and the pump shaft is disposed in front of and below the balancer shaft. The pump shaft extends in the vehicle width direction, and the rotation of the crankshaft 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.

Patent No. 3907903

  However, by providing the water pump for cooling water coaxially with the oil pump as described above, the arrangement position of the water pump is limited. In particular, in a scooter vehicle in which cylinders are disposed 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 at the time of injection of the cooling water, which affects the cooling performance.

  This invention is made in view of the point concerned, and it aims at providing the arrangement structure of a water pump which can realize cooling performance suitable for an engine state, securing the minimum ground clearance and a bank angle. Do.

  An arrangement structure of a water pump according to one aspect of the present invention is an engine having a cylinder and a cylinder head extending obliquely upward from the crankcase, a cooling fan provided at an end of a crankshaft, and an axial direction of the crankshaft And a water pump for feeding cooling water to the engine, wherein the water pump is an electric pump having a drive motor, and at least a part of which is a side surface of the engine. It is characterized in that it overlaps with the cylinder head visually and is disposed apart from the engine.

  According to the present invention, the cooling performance suitable for the engine state can be realized while securing the minimum ground clearance and the bank angle.

FIG. 1 is a right side view showing a schematic configuration of a motorcycle according to the present embodiment. It is a right side view showing the peripheral composition of an engine. It is the figure which abbreviate | omitted the radiator cover of FIG. It is the figure which abbreviate | 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 attached drawings. Although an example in which the present invention is applied to a scooter type motorcycle will be described below, 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 three-wheeled vehicles, four-wheeled vehicles and the like. Further, regarding the direction, the front of the vehicle is indicated by arrow FR, the rear of the vehicle is indicated by arrow RE, the upper side of the vehicle is indicated by arrow UP, the lower side is indicated by arrow LO, the left direction of the vehicle is indicated by arrow L, and the right direction of the vehicle is indicated by arrow R. Moreover, in the following drawings, part of the configuration is omitted for convenience of explanation.

  The schematic configuration of the motorcycle according to the present embodiment will be described with reference to FIG. 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 an engine 2 on an underbone type vehicle body frame (not shown). The engine 2 is configured by, for example, a single cylinder engine. In particular, in the present embodiment, a unit swing type engine is adopted in which the transmission mechanism to the engine 2, the transmission (CVT unit, etc. described later) and the rear wheel 26 is integrated with the swing arm.

  Various covers as vehicle exteriors are attached to the vehicle body frame and the engine 2. Specifically, on the front side of the vehicle, a leg shield 11 for protecting the driver's foot is provided in front. At the rear of the leg shield 11, a center frame cover 12 is provided. A footboard 13 extending rearward is provided at the lower end of the center frame cover 12. At the rear of the footboard 13, a side frame cover 14 is provided to cover the side of the vehicle.

  At the front of the vehicle, a front fork 15 is rotatably supported via a steering shaft (not shown). A handle bar 17 for steering the front wheel 16 is provided above the front fork 15. A front wheel 16 is rotatably supported at a lower portion of 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. An engine 2 as an internal combustion engine is disposed 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 is configured to be able to swing up and down with the connection 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 an exhaust port of the engine 2 as an exhaust system. The exhaust pipe 30 extends rearward below the engine 2. The muffler 31 is connected to the rear end of the exhaust pipe 30, and is arranged to overlap the rear wheel 26 in a side view. The sides of the muffler 31 are covered by a muffler cover 32.

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

  As described above, the engine 2 according to the present embodiment is configured of a unit swing type engine employed in the scooter type motorcycle 1 (see FIG. 1). The engine 2 includes a crankcase 20 in which various components such as a crankshaft (not shown) are accommodated, 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. And a head cover 23. The cylinder 21 is arranged to be inclined such that the axis is directed substantially in the horizontal direction.

  Specifically, the axis of the cylinder 21 is directed in a direction (substantially horizontal direction) in which the front side (the 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 without departing from the spirit of the present invention.

  The cylinder 21 is attached to the front of the crankcase 20. A cylindrical bore (combustion chamber) for housing a piston is formed inside the cylinder 21 (both not shown). The cylinder head 22 is attached to the front 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 of the cylinder 21 and serves to cover the cylinder 21. Inside the cylinder head cover 23, a valve mechanism (not shown) for opening and closing an intake and exhaust valve (not shown) is accommodated.

  The crankcase 20 is configured by connecting left and right split left and right cases 24 and 25 with bolts or the like. The mating surface of the left case 24 and the right case 25 passes through the axial center of the cylinder. The crankcase 20 accommodates a crankshaft, and the crankshaft is disposed 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 mounted at its rear end. That is, the left case 24 constitutes a swing arm that supports the rear wheel 26 in a cantilever manner. The left side surface of the left case 24 is open, and various gears for transmitting power are accommodated inside the front and rear side. A transmission gear case (not shown) is attached to the left 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 (Continuously Variable Transmission), and includes a drive pulley (not shown) provided on the left end side of the crankshaft. A belt (not shown) is wound around the drive pulley, and gear change is realized by changing the winding radius of the belt.

  On the right side (right case 25) of the crankcase 20, a motor (not shown) as a generator is provided. The motor includes a magnet (not shown) provided on the right end side of the crankshaft. On the further right side of the magneto, a cooling fan 5 for cooling a radiator 4 described later is provided. The cooling fan 5 is fixed to the right end of the crankshaft, and generates cooling air by rotating along with the rotation of the crankshaft.

  A radiator 4 is provided via a radiator case 6 on the outer side of the cooling fan 5, that is, on the right side of the cooling fan 5 in the axial direction of the crankshaft. 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 is configured by opposing the upper tank 40 and the lower tank 41 in the vertical direction, and connecting the upper tank 40 and the lower tank 41 by the 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. The upper tank 40 partially protrudes upward, and a radiator cap 43 is attached to the upper end portion thereof. The radiator core 42 is disposed 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 passage of the cooling air through the radiator core 42. The radiator 4 is covered by a radiator cover 61. The piping system connected to the radiator 4 will be described later.

  An air cleaner 29 is connected to an intake port of the engine 2 via a throttle body 28. The throttle body 28 and the air cleaner 29 are disposed in the space above the engine 2. A muffler 31 is connected to an exhaust port of the engine 2 via an exhaust pipe 30. The exhaust pipe 30 projects downward from the exhaust port and bends to the right, and then extends rearward of the engine. The muffler 31 is connected to the rear end of the exhaust pipe 30. The muffler 31 is disposed to the right of the rear wheel 26. Exhaust gas generated by the combustion of the engine 2 is exhausted from the exhaust port through the exhaust pipe 30 and after being muffled by the muffler 31.

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

  In particular, in a scooter vehicle, the water pump is more effective than the cylinder and the cylinder head in order to prevent the air from being accumulated inside and causing the pump to run idle (pushing out the air) when the coolant is injected. It needs to be placed low. As a result, the position of the water pump has been a factor affecting the minimum ground clearance of the vehicle.

  In addition, as described above, the water-cooled engine is provided with a radiator in order to flow through the engine and cool the warmed cooling water. For example, in a water-cooled scooter vehicle, a cooling fan is provided at an end of a crankshaft, and a radiator is disposed 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 crankshaft, the rotation of the cooling fan depends on the number of rotations of the engine (crankshaft). That is, while the engine is operating, the cooling fan is always operated, and the cooling air passes through the radiator. In particular, since the cooling air increases in proportion to the engine rotational speed, it is difficult to perform detailed water temperature control, and it is difficult to satisfy the cooling performance according to the operating condition.

  For example, even if cooling is unnecessary, overcooling easily occurs because the cooling air generated by the cooling fan passes through the radiator. Specifically, there is a problem in the warm-up performance because the radiator works even in the idling state at the time of cold. As a result, the combustion becomes unstable, which may affect the fuel efficiency.

  In addition, it is the idle standing condition after the maximum load operation that the engine is most likely to be hot. At this time, when the engine speed falls to the idle speed, the work of the cooling fan also falls. That is, despite the situation where it is desired to actively cool the engine, the amount of drive of the cooling fan will be reduced. 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, when the radiator itself is increased in size, the warm-up performance is sacrificed as described above. As described above, since the cooling performance and the warm-up performance conflict with each other, it is difficult to balance the current situation.

  Therefore, the present inventors have conceived of the present invention in view of these circumstances. Specifically, in the present embodiment, an electric pump is employed as the water pump 7 for feeding cooling water to the engine 2, and the water pump 7 is disposed independently of the engine 2. By employing the electric pump, it is possible to freely control the driving of the water pump 7 without depending on the driving state (engine speed) of the engine 2.

  For example, in the warm-up state immediately after the start of the engine, the cooling efficiency of the radiator 4 can be reduced by reducing the driving amount of the water pump 7, and the warm-up performance can be enhanced. On the other hand, in the idle state after the engine maximum load operation, it is possible to increase the cooling efficiency of the radiator 4 and increase the cooling performance by increasing the driving amount of the water pump 7. Thus, it is possible to flexibly control the cooling performance in accordance with the driving state of the engine 2. For this reason, it is possible to reduce the configuration of the thermostat, the hose, the clip, etc., which were required in the conventional configuration.

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

  According to this configuration, the water pump 7 can be disposed at a position higher than the conventional one. Further, by disposing the water pump 7 away from the engine 2, the crankcase 20 can be miniaturized. These make it easy 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 crankshaft, and the radiator 4 is disposed further outside the cooling fan 5. Therefore, the engine 2 (crankcase 20 etc.) 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 the arrangement structure thereof will be described in detail. As shown in FIGS. 2 to 6, the water pump 7 is configured by housing a drive motor 71 and an impeller 72 in a case 70 having a cylindrical outer shape.

  The case 70 includes an upper half 73 in which the drive motor 71 is accommodated and a lower half 74 in which the impeller 72 is accommodated. 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 thereof to each other. A mating portion between the upper half 73 and the lower half 74 is a radially projecting ring-shaped flange (not shown). The flange portion is covered by a ring-shaped rubber member 75. The case 70 is disposed within the vertical width of the radiator core 42 in the side view shown in FIG.

  By attaching the plate-like bracket 76 to the rubber member 75 and fixing the bracket 76 to, for example, the radiator case 6, the water pump 7 is supported floating. The rubber member 75 suppresses the 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 being fixed to the radiator case 6, and may be fixed to the peripheral configuration of the water pump 7 such as the crank case 20 and the radiator cover 61.

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

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

  Further, on the left side surface (cylindrical surface) of the lower half portion 74, a nipple 79 which protrudes toward the left side (the cylinder 21 side) is formed. The nipple 79 is connected to the upstream end of a pump outlet hose 80 for introducing the cooling water from the water pump 7 into the engine 2 (cylinder 21). 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 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 fed into the engine 2 from the water pump 7 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 having flowed 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, the connector 81 is provided with a water temperature sensor 83 for detecting the temperature of the cooling water immediately after flowing through the engine 2.

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

  In the present embodiment, the water pump 7 (case 70) is disposed 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 receiving heat directly from the engine 2. In addition, since there is 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 to reduce the pressure loss of the cooling water. Furthermore, by reducing the sudden bending of various hoses, the hose length can be shortened (the connection can be made at the shortest), so that the weight of the hose itself and the weight of the cooling water flowing in the hose can be reduced.

  In the water pump 7, the upper half 73 on the drive motor 71 side is directed to the upper side of the engine 2, and the lower half 74 on the impeller 72 side is directed to the lower side of the engine 2. Further, the axial direction of the impeller 72 (drive motor 71) is directed in the vertical direction of the engine 2. Since the drive motor 71 side is directed upward, the harness coupler 71a for the drive motor 71 can be disposed above the water pump 7. As a result, it is possible to shorten the harness. Further, by disposing the coupler 71a above the water pump 7, it is possible to suppress the entry 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). For this reason, it is possible to promote air removal at the time of injecting the cooling water into the water pump 7, and it is possible to avoid an uncoolable state due to air accumulation. Further, the nipple 77 is provided on the lower surface of the lower half 74, and the nipple 79 is provided on the side of the lower half 74, so that the water pump 7 is disposed as high as possible in consideration of the above-described air removability. It is possible.

  The radiator outlet hose 78 and the pump outlet hose 80 connected to the nipples 77 and 79 are located below the upper end of the upper half 73 and behind the front end of the case 70. As a result, it is possible to make the piping parts compact within the arrangement space of the water pump 7.

  In particular, the nipple 77 is directed toward the lower tank 41 on the lower side, 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, it is possible to connect the lower tank 41 and the water pump 7, the water pump 7 and the cylinder 21, the cylinder and the upper tank 40 with the shortest distance. 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 this embodiment, the water pump 7 is a so-called side radiator type scooter vehicle in which the cooling fan 5 is disposed at the shaft end of the crankshaft and the radiator 4 is disposed outside the cooling fan 5. Are electrically driven in front of the radiator 4. Thereby, it is possible to realize the cooling performance suitable for the engine state while securing the minimum ground clearance and the bank angle.

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

  Further, although the unit swing type engine 2 has been described as an example in the above embodiment, 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 separate parts.

  Moreover, although it was set as the structure where the axial direction of the water pump 7 (impeller 72) is turned to a perpendicular direction in the said embodiment, it is not limited to this structure. The axial direction of the impeller 72 may be inclined in any direction.

  In the above embodiment, the lower end of the lower half portion 74 is located above the center of the crankshaft in a side view, but the present invention is not limited to this configuration. The case 70 may have the same height as the crankshaft, that is, the case 70 and the center of the crankshaft may overlap in a front view.

  Further, although the present embodiment and the modification have been described, the above embodiment and the modification may be totally or partially combined as another embodiment of the present invention.

  Furthermore, the embodiments of the present invention are not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the scope of the technical idea of the present invention. Furthermore, if the technical idea of the present invention can be realized in another way by technological advancement or another derivative technology, it may be implemented using that method. Therefore, the claims cover all the embodiments that can be included within the scope of the technical idea of the present invention.

  As described above, the present invention has an effect that cooling performance suitable for the engine state can be realized while securing a minimum ground clearance and a bank angle, and is particularly useful for a water pump arrangement structure. is there.

1: Motorcycle 2: Engine 4: Radiator 5: Cooling fan 6: Radiator case 7: Water pump 20: Crank case 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 (7)

An engine having a cylinder and a cylinder head extending obliquely upward and forward from the crankcase;
A cooling fan provided at the end of the crankshaft;
A radiator disposed outside the cooling fan in the axial direction of the crankshaft;
A water pump for feeding cooling water to the engine;
The water pump is an electric pump having a drive motor, and at least a portion of the water pump overlaps the cylinder head in a side view of the engine, and is disposed apart from the engine. Arrangement structure.   The water pump according to claim 1, wherein the water pump is disposed between the radiator and the cylinder head cover at the same height as the crank shaft or above the crank shaft in a side view of the engine. Arrangement structure of pump.   The arrangement structure of a water pump according to claim 1 or 2, wherein the water pump is disposed overlapping with the radiator in a front view of the engine. The water pump is
An impeller provided at the shaft end of the drive motor;
And a case for housing the drive motor and the impeller.
The case is disposed with the side in which the impeller is accommodated facing the lower side of the engine,
The water pump arrangement structure according to any one of claims 1 to 3, wherein an axial direction of the impeller is directed in a vertical direction of the engine. The case has a cooling water inlet and a cooling water outlet,
The arrangement structure of a water pump according to claim 4, wherein the cooling water outlet is located above the cooling water inlet. The cooling water inlet is provided on the lower surface of the case,
The arrangement structure of a water pump according to claim 5, wherein the cooling water outlet is provided on a side surface of the case. A hose connected to the cooling water inlet and / or the cooling water outlet;
The arrangement structure of a water pump according to claim 5 or 6, wherein the hose is located below the upper end of the case and behind the front end of the case.

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