Hybrid saddle riding vehicle

Abstract

To reduce an occupied space and improve cooling efficiency in a hybrid straddle vehicle in a compatible manner.SOLUTION: A hybrid straddle vehicle includes: an internal combustion engine; an electric motor that generates power to be transmitted to drive wheels; an inverter that controls electric power to be supplied to the electric power; a first radiator that cools the internal combustion engine; a second radiator that cools at least one cooling target selected from a group of the electric motor and the inverter, the second radiator being at least partially overlapped with the first radiator and disposed in front of the first radiator as seen from the front side.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a hybrid saddle-ride vehicle having an internal combustion engine and an electric motor. [Background technology]

[0002] Patent Document 1 discloses a series hybrid straddle-type vehicle equipped with an engine radiator that cools a generator engine, and a motor radiator that cools a motor unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 213590 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the engine radiator and the motor radiator occupy a large space, the freedom of arrangement of other parts is reduced in a saddle-ride vehicle, which has a limited vehicle size. If the radiators are made smaller to reduce the space occupied by these radiators, the cooling efficiency will decrease. Therefore, an object of the present disclosure is to achieve both a reduction in occupied space and an improvement in cooling efficiency in a hybrid saddle-ride vehicle. [Means for solving the problem]

[0005] A hybrid saddle-ride vehicle according to one embodiment of the present disclosure includes an internal combustion engine, an electric motor that generates power to be transmitted to drive wheels, an inverter that controls power supplied to the electric motor, a first radiator for cooling the internal combustion engine, and a second radiator for cooling at least one cooling object selected from the group of the electric motor and the inverter, the second radiator at least partially overlapping the first radiator when viewed from the front of the vehicle and positioned in front of the first radiator. Effect of the Invention

[0006] According to one aspect of the present disclosure, in a saddle-ride vehicle in which the vehicle size is limited, the total space occupied in the vehicle width direction by the first radiator and the second radiator can be reduced. Since a coolant at a lower temperature flows in the second radiator compared to the first radiator for cooling the high-temperature internal combustion engine, the traveling wind that has been heated by passing through the second radiator can be reused to cool the first radiator. Therefore, it is possible to achieve both a reduction in the occupied space and an improvement in cooling efficiency. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a left side view of a hybrid saddle riding vehicle according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of the power unit, the first radiator, and the second radiator in FIG. 1 as viewed from the right front of the vehicle. [Diagram 3] FIG. 3 is a plan view of the first radiator and the second radiator in FIG. 2 as viewed from above the vehicle. [Figure 4] FIG. 4 is a front view of the first radiator and the second radiator in FIG. 1 as viewed from the front of the vehicle. [Diagram 5] FIG. 5 is a schematic diagram of a cooling path of the second radiator in FIG. [Figure 6] 6 is a left side view of the power unit, the first radiator, the second radiator and their vicinity shown in FIG. [Figure 7]7 is a perspective view of the power unit, the first radiator, and the second radiator in FIG. 6 as viewed from the right rear of the vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment will be described with reference to the drawings. In the following description, the concept of direction is based on the direction seen by a rider riding on a vehicle. That is, the forward direction of the vehicle is defined as the front, the opposite direction is defined as the rear, and the vehicle width direction is defined as the left-right direction.

[0009] FIG. 1 is a left side view of a hybrid saddle-ride vehicle 1 according to an embodiment. As shown in FIG. 1, the hybrid saddle-ride vehicle 1 is, as an example, a motorcycle, but may be any other vehicle (e.g., a three-wheeled vehicle) that a rider straddles. The vehicle 1 is a parallel hybrid vehicle. The vehicle 1 includes a front wheel 2, a rear wheel 3, and a body frame 4. The front wheel 2 is connected to the front of the body frame 4 by a pair of left and right front forks 5. The front wheel 2 is covered from above by a front fender 6. The rear wheel 3 is connected to the body frame 4 by a swing arm 7.

[0010] The body frame 4 includes a head pipe 4a through which a steering shaft 8 is rotatably inserted, and a main frame 4b extending rearward from the head pipe 4a. The front fork 5 is connected to the steering shaft 8 via a bracket. A handlebar 9 that is gripped by the rider's hands is connected to the steering shaft 8. A fuel tank 10 is disposed behind the handlebar 9. A seat 11 on which a rider sits is disposed behind the fuel tank 10. A power unit 12 is mounted on the body frame 4 between the front wheel 2 and the rear wheel 3. The power unit 12 is a drive source for driving the drive wheels.

[0011] The power unit 12 includes an internal combustion engine 13 and an electric motor unit 14. The internal combustion engine 13 and the electric motor unit 14 are prime movers that generate power transmitted to the rear wheels 3. The internal combustion engine 13 is a two-cylinder engine, but the number of cylinders may be other than two. The internal combustion engine 13 includes a cylinder 25, a crankcase 26, and a crankshaft 27. The cylinder 25 houses a piston. The cylinder 25 and the piston define a combustion chamber. The crankshaft 27 is connected to the piston. The cylinder 25 has an intake port 25a (see FIG. 7) and an exhaust port 25b (see FIG. 6). The crankcase 26 is disposed below the cylinder 25 and houses the crankshaft 27.

[0012] The crankcase 26 accommodates the transmission 15 together with the crankshaft 27. The transmission 15 is disposed behind the crankshaft 27. One end of the crankshaft 27 is connected to the transmission 15 so as to be capable of transmitting power. An output shaft of the transmission 15 is connected to the rear wheel 3 via an output transmission member 16 such as a chain or a belt. The driving force output by the internal combustion engine 13 is transmitted to the rear wheel 3 via the transmission 15 and the output transmission member 16. A side stand 28 is rotatably attached to the body frame 4. The side stand 28 can be rotated so as to protrude downward and to the left from the body frame 4 and can be placed on the ground. When parking using the side stand 28, the vehicle 1 is inclined to the left.

[0013] The crankcase 26 extends rearward beyond the cylinder 25. The electric motor unit 14 is mounted on the upper surface of the crankcase 26 rearward of the cylinder 25. The electric motor unit 14 is connected to the transmission 15 so as to be capable of transmitting power. The driving force output by the electric motor unit 14 is transmitted to the rear wheel 3 via the transmission 15 and an output transmission member 16.

[0014] An exhaust pipe 17 that guides exhaust gas generated by combustion in the cylinder 25 is connected to an exhaust port 25b (see FIG. 6) of the internal combustion engine 13. The exhaust pipe 17 extends from the exhaust port 25b to the front and below the cylinder 25, passes rearward below the crankcase 26, and is connected to a sound-absorbing muffler 18 disposed on the right side of the rear wheel 3.

[0015] The other end of the crankshaft 27 is connected to the starter generator 19 so as to be capable of transmitting power. The starter generator 19 is an example of a component connected to the crankshaft 27. The starter generator 19 is disposed coaxially with the crankshaft 27. The starter generator 19 drives the crankshaft 27 to start the internal combustion engine 13, and is driven by the crankshaft 27 to generate electricity while the internal combustion engine 13 is in operation. The starter generator 19 is covered with a cover 20 that is detachably fixed to the left side surface of the crankcase 26 by a fastener.

[0016] A first radiator 21 and a second radiator 22 are disposed in front of the internal combustion engine 13. The first radiator 21 is intended to cool the internal combustion engine 13. The second radiator 22 is intended to cool the electric motor unit 14. The first radiator 21 and the second radiator 22 are covered in the left-right direction of the vehicle by a front cowl 23 supported by the body frame 4. The second radiator 22 is disposed in front of the first radiator 21. The second radiator 22 is disposed behind the front forks 5. The first radiator 21 and the second radiator 22 are disposed in an inclined position such that their upper ends are located further forward of the vehicle than their lower ends.

[0017] The lower end of the second radiator 22 is located above the lower end of the front fender 6 when the vehicle is stationary. The lower end of the second radiator 22 is located above the crankcase 26. The lower end of the second radiator 22 is located below the upper end of the front fender 6 when the vehicle is stationary. The upper end of the second radiator 22 is located below the head pipe 4a. The upper end of the second radiator 22 is located above the upper end of the front wheel 2 when the vehicle is stationary. The height range of the second radiator 22 overlaps with the height range of the cylinder 25. The lower end of the second radiator 22 is located below the upper end of the cylinder 25. The upper end of the second radiator 22 is located above the lower end of the cylinder 25.

[0018] Fig. 2 is a perspective view of the power unit 12, the first radiator 21, and the second radiator 22 in Fig. 1 as viewed from the right front of the vehicle. As shown in Fig. 2, the second radiator 22 has a smaller frontal projection area than the first radiator 21. For example, the frontal projection area of ​​the second radiator 22 is smaller than 50% and larger than 10% of the frontal projection area of ​​the first radiator 21. More specifically, the frontal projection area of ​​the second radiator 22 may be larger than 20% and smaller than 40% of the frontal projection area of ​​the first radiator 21.

[0019] The second radiator 22 overlaps the first radiator 21 when viewed from the front of the vehicle. The second radiator 22 is disposed to one side in the left-right direction from the left-right center of the first radiator 21. In this embodiment, the second radiator 22 is disposed to the left of the vehicle (to the right in FIG. 2) from the left-right center of the first radiator 21. The second radiator 22 is disposed on the side where the side stand 28 (see FIG. 1) is present, i.e., on the left side, with respect to the left-right center of the vehicle 1.

[0020] The first radiator 21 includes a first heat exchanger 21a, a first inlet tank 21b, and a first outlet tank 21c. The first heat exchanger 21a has a plurality of coolant tubes that connect the first inlet tank 21b to the first outlet tank 21c, and a plurality of heat dissipation fins provided on the outer surfaces of the coolant tubes. That is, as air passes through the first heat exchanger 21a from the front to the rear, the heat of the coolant in the coolant tube is released to the air through the heat dissipation fins, and the coolant in the coolant tube is cooled. The first inlet tank 21b and the first outlet tank 21c each define a storage space that communicates with a flow path in the coolant tube of the first heat exchanger 21a.

[0021] The first radiator 21 has a plate-like outer shape overall. A normal line perpendicular to the traveling wind receiving surface, which is the main surface of the first radiator 21, faces forward. The first inlet tank portion 21b is adjacent to the left side (right side in FIG. 2) of the first heat exchange portion 21a. The first outlet tank portion 21c is adjacent to the right side (left side in FIG. 2) of the first heat exchange portion 21a. The first radiator 21 is oriented such that the left-right dimension is greater than the up-down dimension.

[0022] The second radiator 22 includes a second heat exchanger 22a, a second inlet tank 22b, and a second outlet tank 22c. The second heat exchanger 22a has a plurality of coolant tubes that connect the second inlet tank 22b to the second outlet tank 22c, and a plurality of heat dissipation fins provided on the outer surfaces of the coolant tubes. That is, as air passes through the second heat exchanger 22a from the front to the rear, the heat of the coolant in the coolant tubes is released to the air through the heat dissipation fins, and the coolant in the coolant tubes is cooled. The second inlet tank 22b and the second outlet tank 22c each define a storage space that communicates with a flow path in the coolant tube of the second heat exchanger 22a.

[0023] The second radiator 22 has a plate-like outer shape overall. A normal line perpendicular to the traveling wind receiving surface, which is the main surface of the second radiator 22, faces forward. The second inlet tank portion 22b is adjacent to the upper side of the second heat exchange portion 22a. The second outlet tank portion 22c is adjacent to the lower side of the second heat exchange portion 22a. The second radiator 22 is oriented such that the vertical dimension is larger than the horizontal dimension.

[0024] The exhaust pipe 17 extends in one direction with respect to the left-right center of the vehicle 1. Specifically, the exhaust pipe 17 extends to the right with respect to the left-right center of the vehicle 1 in order to connect to a sound-absorbing muffler 18 (see FIG. 1) disposed to the right of the rear wheel 3. The exhaust pipe 17 passes through a space directly below a right half portion of the crankcase 26. The exhaust pipe 17 extends toward one side in the left-right direction (right side) with respect to the left-right center of the vehicle 1, while the second radiator 22 is disposed shifted toward the other side in the left-right direction (left side) with respect to the left-right center of the vehicle 1. As a result, the second radiator 22 is disposed apart in the left-right direction from the exhaust pipe 17 when viewed from above the vehicle.

[0025] A first inlet tube 34 is connected to the first inlet tank portion 21b of the first radiator 21. The first inlet tube 34 guides the coolant that has cooled the cylinder 25 and has been heated to the first inlet tank portion 21b. A first outlet tube 35 is connected to the first outlet tank portion 21c of the first radiator 21. The first outlet tube 35 guides the coolant cooled by the first radiator 21 to the first pump P1.

[0026] The first pump P1 is a mechanical pump that is mechanically linked to the crankshaft 27 of the internal combustion engine 13. The first pump P1 is provided on the right side of the internal combustion engine 13. The first pump P1 discharges coolant to a cooling passage in the internal combustion engine 13. A cover 32 that is detachably fixed to the right side of the crankcase 26 is disposed behind the first pump P1. The cover 32 covers, from the right side, a clutch that is indirectly connected to the crankshaft 27 (see FIG. 1) of the internal combustion engine 13.

[0027] A second inlet tube 37 is connected to the second inlet tank portion 22b of the second radiator 22. The second inlet tube 37 guides the coolant that has cooled the electric motor unit 14 (see FIG. 1) and has been heated, to the second inlet tank portion 22b. A second outlet tube 38 is connected to the second outlet tank portion 22c of the second radiator 22. The second outlet tube 38 guides the coolant cooled by the second radiator 22 to the second pump P2.

[0028] The second pump P2 is driven independently of the crankshaft 27 of the internal combustion engine 13. For example, the second pump P2 is an electrically driven electric pump. The second pump P2 is fixed to a cover 20 that is detachably fixed to the left side surface of the crankcase 26. The cover 20 covers the starter generator 19 (see FIG. 1) that is coaxial with the crankshaft 27. The second pump P2 is disposed at a position lower than the second radiator 22.

[0029] The second inlet tube 37 passes in the front-rear direction above the first radiator 21. The second outlet tube 38 passes in the front-rear direction below the first radiator 21. At least one of the second inlet tube 37 and the second outlet tube 38 passes directly above the first radiator 21 in the front-rear direction.

[0030] 3 is a plan view of the first radiator 21 and the second radiator 22 in FIG. 2 as viewed from above the vehicle. As shown in FIG. 3, a radiator fan 31 is adjacent to the first radiator 21 in the front-rear direction. In this embodiment, the radiator fan 31 is attached to the first radiator 21 in a state in which it is disposed on the rear side of the first heat exchanger 21a of the first radiator 21. When the vehicle 1 is stopped with the internal combustion engine 13 in operation, the radiator fan 31 is driven electrically to generate an air flow that passes through the first heat exchanger 21a from the front to the rear. When the vehicle 1 is traveling, the radiator fan 31 is stopped, and traveling wind passes through the first heat exchanger 21a from the front to the rear.

[0031] The cylinder 25 of the internal combustion engine 13 is disposed behind the first radiator 21 and the radiator fan 31. In this embodiment, the left-right dimension of the first radiator 21 is larger than the left-right dimension of the cylinder 25. The first radiator 21 protrudes on both left-right sides from the cylinder 25. The second radiator 22 is disposed outward in the left-right direction from the cylinder 25. The second heat exchanger 22a (see FIG. 2) of the second radiator 22 is spaced forward from the first radiator 21 with a gap therebetween. The second radiator 22 directly faces the first radiator 21 in the front-rear direction. The maximum distance in the front-rear direction between the second heat exchanger 22a (see FIG. 2) of the second radiator 22 and the first inlet tank portion 21b of the first radiator 21 may be 10 mm or more and 80 mm or less, and preferably 20 mm or more and 50 mm or less. This prevents an increase in the occupied space, and allows the wind generated during traveling toward the rear from the second radiator 22 to be smoothly discharged avoiding the first inlet tank portion 21b.

[0032] At least a part W of the traveling wind that has passed through the second heat exchange section 22a (see FIG. 2) of the second radiator 22 from the front to the rear passes through the first heat exchange section 21a of the first radiator 21 from the front to the rear. The temperature of the coolant flowing through the first radiator 21 is higher than the temperature of the coolant flowing through the second radiator 22. Therefore, the traveling wind that has been heated by passing through the second heat exchange section 22a (see FIG. 2) of the second radiator 22 can cool the coolant flowing through the first radiator 21. The traveling wind that passes through the second heat exchange section 22a (see FIG. 2) of the second radiator 22 and hits the first inlet tank section 21b of the first radiator 21 flows out to the outside from a gap between the first radiator 21 and the second radiator 22.

[0033] FIG. 4 is a front view of the first radiator 21 and the second radiator 22 in FIG. 1 as viewed from the front of the vehicle. In FIG. 4, the radiators 21 and 22 are inclined forward, so that the upper end surfaces of the radiators 21 and 22 are visible as viewed from the front of the vehicle. As shown in FIG. 4, the second radiator 22 partially overlaps the first radiator 21 as viewed from the front of the vehicle. The left-right center of the second radiator 22 overlaps the first radiator 21 as viewed from the front of the vehicle. Specifically, the left-right center of the second radiator 22 overlaps the first inlet tank portion 21b as viewed from the front of the vehicle. The second heat exchange portion 22a of the second radiator 22 overlaps the first heat exchange portion 21a of the first radiator 21 as viewed from the front of the vehicle.

[0034] The first radiator 21 overlaps with the front forks 5 when viewed from the front of the vehicle. The first radiator 21 overlaps with the front wheel 2 and the front fender 6 when viewed from the front of the vehicle. The second radiator 22 is disposed outside the front wheel 2 and the front fender 6 in the left-right direction when viewed from the front of the vehicle. The second radiator 22 is partially disposed outside the front forks 5 in the left-right direction when viewed from the front of the vehicle. The second radiator 22 is entirely disposed outside the radiator fan 31 when viewed from the front of the vehicle. The second radiator 22 overlaps with the first inlet tank portion 21b when viewed from the front of the vehicle.

[0035] 5 is a schematic diagram of a cooling path of the second radiator 22 in FIG. 2. As shown in FIG. 5, the electric motor unit 14 includes an electric motor 51 and an inverter 52. In this embodiment, the inverter 52 is integrated with the electric motor 51. The second radiator 22 is intended to cool heat-generating electric components that generate heat due to the driving of the electric motor unit 14. Specifically, the second radiator 22 is intended to cool the electric motor 51 and the inverter 52. The electric motor 51 generates driving force for driving the rear wheels 3. The inverter 52 controls the power supplied to the electric motor 51.

[0036] The electric motor unit 14 is disposed offset to the left with respect to a vehicle center line CL that passes through the center of the vehicle 1 in the left-right direction and extends in the front-rear direction. In this embodiment, the electric motor 51 is disposed across the vehicle center line CL such that the center of the electric motor 51 is located to the left of the vehicle center line CL. The entire inverter 52 is located to the left of the vehicle center line CL. The inverter 52 is adjacent to the left side of the electric motor 51. The electric motor unit 14 and the second radiator 22 are disposed offset to one side in the left-right direction with respect to the vehicle center line CL. Specifically, both the electric motor unit 14 and the second radiator 22 are disposed offset to the left with respect to the vehicle center line CL.

[0037] The portion of the second radiator 22 to which the second inlet tube 37 is connected is disposed to the left of the left-right center of the second radiator 22. The portion of the second radiator 22 to which the second outlet tube 38 is connected is disposed to the left of the left-right center of the second radiator 22. The portions of the second radiator 22 to which the tubes 37, 38 are connected are disposed offset in the same direction as the electric motor unit 14 is offset with respect to the vehicle center line CL.

[0038] The electric motor 51 has a cooling passage 51a and an outlet 51b communicating with the cooling passage 51a. The inverter 52 has a cooling passage 52a and an inlet 52b communicating with the cooling passage 52a. The outlet of the cooling passage 52a is connected to the inlet of the cooling passage 51a. The inlet 52b is provided on the left side of the inverter 52. The outlet 51b is provided on the right side of the electric motor 51. The second relay tube 39 connects the second pump P2 to the inlet 52b of the inverter 52.

[0039] The coolant cooled by the second radiator 22 flows through the second outlet tube 38, the second pump P2, and the second relay tube 39 in this order by the drive of the second pump P2, and enters the inlet 52b of the inverter 52. The coolant flows through the cooling flow passages 52a and 51a in this order, cooling the inverter 52 and the electric motor 51, and flows out from the outlet 51b into the second inlet tube 37. The flowed-out coolant is cooled in the second radiator 22.

[0040] FIG. 6 is a left side view of the power unit 12, the first radiator 21, the second radiator 22, and the vicinity thereof in FIG. 1. As shown in FIG. 6, the first radiator 21 is disposed along the closest frame portion of the body frame 4 immediately behind the first radiator 21 in a side view of the vehicle. Specifically, the closest frame portion immediately behind the first radiator 21 is inclined so as to extend forward and upward, and the first radiator 21 is also inclined so as to extend forward and upward. The second radiator 22 is also inclined so as to extend forward and upward. The first radiator 21 and the second radiator 22 are inclined along the inclination direction of the cylinder 25. The second radiator 22 is parallel to the first radiator 21 in a side view of the vehicle.

[0041] An upper portion of the first radiator 21 is fixed to the main frame 4b via a bracket B1 (see also FIG. 2). An upper portion of the second radiator 22 is fixed to the first radiator 21 via a bracket B2. A lower portion of the first radiator 21 and a lower portion of the second radiator 22 are fixed to the main frame 4b via a bracket B3.

[0042] The first inlet tube 34 connected to the first radiator 21 is connected to a cooling passage outlet on the left side surface of the internal combustion engine 13. The cooling passage inlet of the internal combustion engine 13 is supplied with the coolant discharged by the first pump P1 (see FIG. 2).

[0043] The cover 20 includes a cover body 20a that covers the starter generator 19, and a pump support portion 20b that protrudes from the cover body 20a. The second pump P2 is fixed to the pump support portion 20b of the cover 20 by a fastener. Specifically, the pump support portion 20b protrudes upward from the cover body 20a and has an upper surface 20ba. The second pump P2 is placed from above on the upper surface 20ba of the pump support portion 20b.

[0044] The second pump P2 is disposed so as to overlap the internal combustion engine 13 in a side view of the vehicle. The second pump P2 is disposed between the second radiator 22 and the electric motor unit 14 in the front-rear direction. The second pump P2 is disposed at a position lower than the second outlet tank portion 22c of the second radiator 22 and the inlet 52b of the electric motor unit 14.

[0045] The second inlet tube 37 passes above the first radiator 21 in the front-rear direction. The second inlet tube 37 extends in the front-rear direction from the rear of the cylinder 25 to the front of the cylinder 25 on the left side of the vehicle center line CL (see FIG. 5). The second outlet tube 38 passes below the first radiator 21 in the front-rear direction. The second inlet tube 37 and the second outlet tube 38 are disposed away from the first radiator 21 without overlapping with the first radiator 21 in a side view of the vehicle.

[0046] Fig. 7 is a perspective view of the power unit 12, the first radiator 21, and the second radiator 22 in Fig. 6, as viewed from the right rear of the vehicle. As shown in Fig. 7, the vehicle 1 is provided with a common reservoir tank 40 for the first radiator 21 and the second radiator 22. The common reservoir tank 40 is supported by the body frame 4 (see Fig. 1). The common reservoir tank 40 serves to store coolant that has overflowed from the first radiator 21 or the second radiator 22, and to replenish the first radiator 21 or the second radiator 22 with coolant. The coolant in the first radiator 21 and the coolant in the second radiator 22 are the same type.

[0047] The common reservoir tank 40 is disposed on the opposite side of the second radiator 22 with respect to the first radiator 21 in the left-right direction. In this embodiment, the second radiator 22 is disposed on the left side with respect to the first radiator 21, and the common reservoir tank 40 is disposed on the right side with respect to the first radiator 21.

[0048] The common reservoir tank 40 has a liquid inlet 40a. The liquid inlet 40a is detachably closed by a reservoir cap 41. The common reservoir tank 40 is connected to the first radiator 21 and the second radiator 22 by a common reservoir tube 42. The common reservoir tube 42 extends in the front-rear direction from the front of the cylinder 25 to the rear of the cylinder 25 on the right side of the vehicle center line CL (see FIG. 5).

[0049] The common reservoir tube 42 has a base line portion 42a, a first branch line portion 42b, and a second branch line portion 42c. The first branch line portion 42b and the second branch line portion 42c branch off from the base line portion 42a. The base line portion 42a is connected to the common reservoir tank 40. The first branch line portion 42b connects the base line portion 42a to, for example, the first outlet tank portion 21c of the first radiator 21. The second branch line portion 42c connects the base line portion 42a to, for example, the cooling passage 51a of the electric motor unit 14.

[0050] According to the configuration described above, in a saddle-type vehicle 1 in which the vehicle size is limited, the total space occupied in the left-right direction by the first radiator 21 and the second radiator 22 can be reduced. Since high-temperature coolant flows through the first radiator 21 for cooling the internal combustion engine 13, which is hotter than the electric motor unit 14, the traveling wind that has passed through the second radiator 22 and been heated can be reused to cool the first radiator 21. Therefore, it is possible to achieve both a reduction in the occupied space and an improvement in cooling efficiency.

[0051] The second radiator 22 is disposed to one side in the left-right direction from the left-right center of the first radiator 21, and the left-right center of the second radiator 22 overlaps with the first radiator 21 when viewed from the front. With this, while reducing the total space occupied by the first radiator 21 and the second radiator 22 when viewed from the front, the traveling wind is directly guided to the left-right center of the first radiator 21, and the cooling efficiency of the first radiator 21 can be maintained at a good level.

[0052] In this embodiment, the second radiator 22 overlaps with a portion of the first radiator 21 that is closer to the first inlet tank portion 21b than the first outlet tank portion 21c when viewed from the front. This increases the temperature difference between the traveling wind that has passed through the second radiator 22 and the portion of the first radiator 21 through which the traveling wind passes, compared to when the second radiator 22 overlaps with a portion of the first radiator 21 that is closer to the first outlet tank portion 21c than the first inlet tank portion 21b when viewed from the front. This makes it possible to suppress a decrease in the heat exchange performance of the first radiator 21.

[0053] The entire second radiator 22 is disposed on the left-right outer side of the front wheel 2 when viewed from the front. This allows the traveling wind to be easily guided directly to the second radiator 22 without being obstructed by the front wheel 2, thereby improving the cooling efficiency of the second radiator 22. In this embodiment, the center of the second radiator 22 in the vehicle width direction is disposed on the outer side of the front forks 5 in the vehicle width direction. In other words, the outer end of the second radiator 22 in the vehicle width direction is located further outboard than the front forks 5. This allows the traveling wind guided to the outer side in the vehicle width direction by the front forks 6 to be easily guided to the second radiator 22, thereby further improving the cooling efficiency.

[0054] The lower end of the second radiator 22 is disposed higher than the lower end of the front fender 6. This can reduce the possibility that the second radiator 22 will be hit by flying stones.

[0055] The entire second radiator 22 is disposed outside the radiator fan 31 when viewed from the front. This allows the air flow passing through the first radiator 21 to be generated well by the radiator fan 31 without being obstructed by the second radiator 22.

[0056] The second radiator 22 overlaps with the first inlet tank portion 21b or the first outlet tank portion 21c when viewed from the front. This reduces the area where the second radiator 22 overlaps with the first heat exchange portion 21a when viewed from the front, and improves the cooling efficiency of the first radiator 21.

[0057] The second inlet tube 37 and the second outlet tube 38 pass in the front-rear direction above or below the first radiator 21. This allows the tubes 37, 38 connected to the second radiator 22 to be arranged compactly. The tubes 37, 38 connected to the second radiator 22 can be prevented from obstructing the path of the wind toward the first radiator 21.

[0058] The second pump P2 is fixed to the cover 20. This eliminates the need to provide the internal combustion engine 13 with a support for mounting the second pump P2 for the second radiator 22, and allows the versatility of the internal combustion engine 13 to be improved.

[0059] The electric motor unit 14 and the second radiator 22 are offset to one side in the left-right direction with respect to the left-right center of the vehicle 1. This allows the tubes 37-39 connecting the electric motor unit 14 and the second radiator 22 to be shortened. The first radiator 21 is disposed parallel to the second radiator 22 and extends rearward as it advances downward. This allows the first radiator 21 to be disposed as far forward as possible while preventing interference due to steering of the front wheels 2.

[0060] The exhaust pipe 17 extends in one left-right direction with respect to the left-right center of the vehicle 1, and the second radiator 22 is offset in the other left-right direction with respect to the left-right center of the vehicle 1. This makes it possible to reduce the effect of heat from the exhaust pipe 17 on the second radiator 22.

[0061] When the internal combustion engine 13 is provided with a valve mechanism for providing power to open and close the intake and exhaust valves, it is preferable that the valve mechanism is provided on one side in the left-right direction as viewed from the center of the vehicle body, and the second radiator 22 is disposed on the other side in the left-right direction as viewed from the center of the vehicle body. This makes it easier to secure a large space behind the second radiator 22, and makes it easier to guide the running wind that has passed through the second radiator 22 and the first radiator 21 rearward.

[0062] The second radiator 22 is disposed on the left side of the vehicle 1, where the side stand 28 (see FIG. 1) is located, with respect to the left-right center of the vehicle 1. When the vehicle 1 is parked with the side stand 28 in use and tilted to the left, the second radiator 22 is located below the center of the first radiator 21. This prevents hot air from the first radiator 21 from heading toward the second radiator 22.

[0063] In this embodiment, since the second pump P2 for the second radiator 22 is an electric pump, even when the internal combustion engine 13 is stopped, the cooling effect can be obtained by circulating the coolant in the second radiator 22. In addition, by providing the second pump P2 for circulating the coolant in the second radiator 22 in addition to the first pump P1 for circulating the coolant in the first radiator 21, the coolant in the second radiator 22 can be circulated independently of the first radiator 21, and the cooling capacity of the second radiator 22 can be prevented from being excessive or insufficient.

[0064] (Modification) Although the vehicle 1 described above is a parallel hybrid vehicle, the present invention is not limited to this and may be a series hybrid vehicle. The driving force output by the electric motor 51 may be transmitted to the rear wheels 3 without passing through the transmission 15. The inverter 52 may be separated from the electric motor 51. The second radiator 22 may be configured to cool only one of the electric motor 51 or the inverter 52.

[0065] The second radiator 22 may entirely overlap the first radiator 21 when viewed from the front of the vehicle. The left-right center of the second radiator 22 may overlap the first heat exchanger 21a of the first radiator 21 when viewed from the front of the vehicle. The left-right center of the second radiator 22 may not overlap the first radiator 21 when viewed from the front of the vehicle. The second radiator 22 may be disposed entirely outside the front fork 5 in the left-right direction when viewed from the front of the vehicle. The second radiator 22 may overlap the front wheel 2 or the front fender 6 when viewed from the front of the vehicle. The second radiator 22 may overlap the radiator fan 31 when viewed from the front of the vehicle. The second radiator 22 may overlap the first heat exchanger 21a without overlapping either the first inlet tank portion 21b or the first outlet tank portion 21c when viewed from the front of the vehicle.

[0066] Only one of the second inlet tube 37 or the second outlet tube 38 may pass above or below the first radiator 21 in the front-rear direction. The other of the second inlet tube 37 or the second outlet tube 38 may pass outside the first radiator 21 in the left-right direction in the front-rear direction. Both the second inlet tube 37 or the second outlet tube 38 may pass outside the first radiator 21 in the left-right direction in the front-rear direction. Another member (for example, a running wind guide plate) may be interposed in the gap between the first radiator 21 and the second radiator 22.

[0067] The second pump P2 may be mechanical rather than electric. The second pump P2 may be a mechanical pump mechanically linked to the drive shaft of the electric motor 51. The second pump P2 may be attached to another cover that covers components of the internal combustion engine 13, without being attached to the cover 20. For example, the second pump P2 may be detachably fixed to the cover 32 that covers the clutch connected to the crankshaft 27 of the internal combustion engine 13. The second pump P2 may be detachably fixed to the cylinder head cover.

[0068] The second pump P2 may be placed on a surface other than the upper surface of the cover 20. The pump support portion 20b of the cover 20 may protrude in a direction other than the upward direction from the cover main body portion 20a. The pump support portion 20b may be a seating surface that does not protrude from the cover main body portion 20a.

[0069] The electric motor unit 14 and the second radiator 22 may be disposed to the right with respect to the vehicle center line CL. In this case, a portion of the second radiator 22 to which the tubes 37, 38 are connected may be disposed to the right with respect to the vehicle center line CL. The inverter 52 may be disposed adjacent to the right side of the electric motor 51.

[0070] The support structure of the first radiator 21 and the second radiator 22 is not limited to the above-mentioned embodiment. The bracket B1 and the bracket B2 may be integrated, or the first radiator 21 and the second radiator 22 may be fixed to the vehicle frame 4 by one common bracket. The bracket B3 may be divided into multiple parts.

[0071] As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. have been made as appropriate. In addition, it is also possible to combine the components described in the above embodiment to create a new embodiment. For example, a part of the configuration or method in one embodiment may be applied to another embodiment, and a part of the configuration in an embodiment can be separated from other configurations in that embodiment and arbitrarily extracted. In addition, the components described in the attached drawings and detailed description include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the technology. [Explanation of symbols]

[0072] 1 Hybrid saddle-ride vehicle 2 Front wheels 6 Front fender 13. Internal Combustion Engine 14 Electric motor unit 17 Exhaust pipe 19 Starter generator 20 Cover 20ba top surface 21 First radiator 21a 1st heat exchange section 21b First inlet tank section 21c First outlet tank section 22 Second radiator 22a 2nd heat exchange section 22b Second inlet tank section 22c Second outlet tank section 31 Radiator fan 37 Second inlet tube 38 Second outlet tube 51 Electric motor 52 Inverter P2 Second pump

Claims

1. An internal combustion engine; an electric motor that generates power that is transmitted to the drive wheels; an inverter for controlling power supplied to the electric motor; a first radiator for cooling the internal combustion engine; a second radiator for cooling at least one cooling target selected from the group consisting of the electric motor and the inverter, the second radiator at least partially overlapping the first radiator when viewed from the front of the vehicle and disposed in front of the first radiator, the second radiator is disposed on one side in the left-right direction from a left-right center of the first radiator, A hybrid saddle-ride vehicle, wherein the first radiator has, when viewed from the front of the vehicle, one left-right region that overlaps with the second radiator and another left-right region that is exposed from the second radiator.

2. A hybrid saddle-ride vehicle as described in claim 1, wherein the left-right center of the second radiator overlaps with the first radiator when viewed from the front of the vehicle.

3. a front wheel disposed in front of the first radiator and the second radiator; the second radiator is disposed entirely outside the front wheels in a left-right direction as viewed from the front of the vehicle, 3. The hybrid saddle-ride vehicle according to claim 1, wherein one left-right end of the second radiator is disposed laterally further to the left than one left-right end of the first radiator.

4. An internal combustion engine; an electric motor that generates power that is transmitted to the drive wheels; an inverter for controlling power supplied to the electric motor; a first radiator for cooling the internal combustion engine; a second radiator for cooling at least one cooling target selected from the group consisting of the electric motor and the inverter, the second radiator being at least partially overlapping the first radiator when viewed from the front of the vehicle and being disposed in front of the first radiator; a front fender disposed in front of the first radiator and the second radiator, A hybrid saddle-ride vehicle, wherein a lower end of the second radiator is disposed higher than a lower end of the front fender.

5. a radiator fan adjacent to the first radiator in a front-to-rear direction for generating an airflow passing through the first radiator; 5. The hybrid saddle-ride vehicle according to claim 1, wherein the second radiator is entirely disposed outside the radiator fan in the left-right direction when viewed from the front of the vehicle.

6. An internal combustion engine; an electric motor that generates power that is transmitted to the drive wheels; an inverter for controlling power supplied to the electric motor; a first radiator for cooling the internal combustion engine; a second radiator for cooling at least one cooling target selected from the group consisting of the electric motor and the inverter, the second radiator at least partially overlapping the first radiator when viewed from the front of the vehicle and disposed in front of the first radiator, the first radiator includes a first heat exchange portion, a first inlet tank portion adjacent to the first heat exchange portion from one side in the left-right direction, and a first outlet tank portion adjacent to the first heat exchange portion from the other side in the left-right direction, A hybrid saddle-ride vehicle, wherein the second radiator overlaps the first inlet tank portion or the first outlet tank portion when viewed from the front of the vehicle.

7. An internal combustion engine; an electric motor that generates power that is transmitted to the drive wheels; an inverter for controlling power supplied to the electric motor; a first radiator for cooling the internal combustion engine; a second radiator for cooling at least one cooling target selected from the group consisting of the electric motor and the inverter, the second radiator being at least partially overlapping the first radiator when viewed from the front of the vehicle and being disposed in front of the first radiator; an inlet tube connected to the second radiator; an outlet tube connected to the second radiator; the second radiator includes a second heat exchange portion, a second inlet tank portion adjacent to the second heat exchange portion from one side in the up-down direction, and a second outlet tank portion adjacent to the second heat exchange portion from the other side in the up-down direction, the inlet tube is connected to the second inlet tank portion, and the outlet tube is connected to the second outlet tank portion; At least one tube selected from the group consisting of the inlet tube and the outlet tube passes above or below the first radiator in the front-rear direction.

8. a removable cover for covering components of the internal combustion engine; a pump that generates a flow of coolant between the second radiator and the cooling target, The hybrid saddle riding vehicle according to claim 1 , wherein the pump is fixed to the cover.

9. Further comprising a side stand, the cooling target and the second radiator are offset in one direction in a vehicle width direction with respect to a center of the saddle riding vehicle in the vehicle width direction, The hybrid saddle riding vehicle according to any one of claims 1 to 8, wherein the second radiator is disposed on a side where the side stand is present with respect to a center in a vehicle width direction of the saddle riding vehicle.

10. An internal combustion engine; an electric motor that generates power that is transmitted to the drive wheels; an inverter for controlling power supplied to the electric motor; a first radiator for cooling the internal combustion engine; a second radiator for cooling at least one cooling target selected from the group consisting of the electric motor and the inverter, the second radiator being at least partially overlapping the first radiator when viewed from the front of the vehicle and being disposed in front of the first radiator; an exhaust pipe through which exhaust gas from the internal combustion engine is guided; the exhaust pipe extends in one direction in a vehicle width direction with respect to a center in the vehicle width direction of the saddle riding vehicle, A hybrid saddle-ride vehicle, wherein the second radiator is offset in the other vehicle width direction from the center of the saddle-ride vehicle in the vehicle width direction.

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