JP2014084843A - Water-cooled internal combustion engine of saddle type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-cooled internal combustion engine of a saddle type vehicle, capable of securing both suction efficiency of a cooling fan and a banking angle.SOLUTION: In a water-cooled internal combustion engine of a motor cycle, a crankshaft 114 is rotatably arranged so that its axis 114a points to a vehicle width direction, a radiator 81 is arranged outside in an axial direction of the crankshaft 114 and fixed to the internal combustion engine, a cooling fan 83 is arranged between a crankshaft 114 and the radiator 81, an outside lateral side of the radiator 81 is covered with a radiator cover 189, and the internal combustion engine is swingably supported, along with a power transmission device and a rear wheel receiving power from the power transmission device, by a vehicle body frame. The cooling fan 83 is an electric fan, and the vertical centers of the cooling fan 83, the radiator 81, and the radiator cover 189 are arranged to be offset above the axis 114a of the crankshaft 114.

Description

  The present invention relates to an arrangement of a radiator and its peripheral components in a water-cooled internal combustion engine of a saddle-ride type vehicle.

As a conventional water-cooled internal combustion engine of a saddle-ride type vehicle, an AC generator provided at the end of the crankshaft is covered with a generator cover attached to the crankcase, and the crankshaft is positioned outside the generator cover in the vehicle width direction. A cooling fan is provided so as to rotate integrally with the radiator, a radiator is further disposed on the outer side in the vehicle width direction of the cooling fan, and the cooling fan and the radiator are covered with a cover provided on the outer side in the vehicle width direction of the radiator, A cooling fan that cools a radiator by drawing outside air into the radiator is known (for example, see Patent Document 1).
The center of the radiator and the cover in the vertical direction is arranged so as to be offset upward from the axis of the crankshaft, so that the lower end position of the radiator and cover is increased, and the bank angle of the vehicle can be increased. become.

Japanese Patent No. 4638469

In Patent Document 1, since only the radiator and the cover that covers the outside thereof are offset above the axis of the crankshaft, the cooling air suction efficiency to the radiator by the cooling fan fixed to the end of the crankshaft tends to decrease. Considering the suction efficiency, there is a problem that the degree of the upward offset amount is easily limited. Therefore, it is difficult to secure the bank angle by increasing the offset amount while ensuring the suction efficiency of the cooling fan.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a water-cooled internal combustion engine for a saddle-ride type vehicle that can ensure both the suction efficiency and the bank angle of a cooling fan. .

In order to solve the above-described problems, the present invention is arranged such that the crankshaft (114) is rotatably arranged such that its axis (114a) faces in the vehicle width direction, and the radiator (81) is arranged on the crankshaft (114). The cooling fan (83) is disposed between the crankshaft (114) and the radiator (81), and is disposed on the outer side of the radiator (81). Is covered with a radiator cover (189), and the internal combustion engine (71) is swingable to the vehicle body frame (11) together with a power transmission device (72) and a rear wheel (23) receiving power from the power transmission device (72). In the water-cooled internal combustion engine of the saddle-ride type vehicle supported by the cooling fan (83), the cooling fan (83) is an electric type, and the cooling fan (83), the radiator (81), and the radiator casing Both the vertical direction of the center of the over (189), characterized in that it is arranged to offset upward from the axis (114a) of the crankshaft (114).
According to this configuration, when the radiator is disposed on the axially outer side of the internal combustion engine that is swingably supported by the vehicle body frame, the vertical centers of all of the cooling fan, the radiator, and the radiator cover are from the axis of the crankshaft. Are also arranged so as to be offset upward, it becomes easy to secure the ground clearance of the cooling fan, radiator and radiator cover, and a sufficient bank angle can be secured. In particular, since the cooling fan can be electrically operated, the degree of freedom of arrangement of the cooling fan can be improved, and thus the degree of freedom of the offset amount can be improved. Furthermore, since the vertical center of the cooling fan is also offset above the axis of the crankshaft together with the radiator and the radiator cover, even if the radiator and the radiator cover are offset upward, the cooling fan passes through the radiator. The suction efficiency of outside air can be improved.

In the above configuration, the cooling fan (83) is provided so as to be spaced apart from the crankshaft (114) and along the inner surface of the radiator (81), and the cooling fan (83), radiator ( 81) and the center of the radiator cover (189) in the vertical direction may be substantially the same height. According to this configuration, the electric cooling fan that is separated from the crankshaft approaches the inner surface of the radiator, and the vertical centers of the cooling fan, the radiator, and the radiator cover are the same height. When viewed from above, it becomes easy to increase the portion where the cooling fan overlaps the radiator, and it is possible to easily offset upward while ensuring sufficient suction efficiency. In addition, since the cooling fan is provided apart from the crankshaft, the load during rotation of the crankshaft can be reduced, and fuel consumption can be improved.
In the above configuration, the radiator (81) includes an upper tank (95), a lower tank (96) disposed below the upper tank (95), an upper tank (95), a lower tank ( 96) and a core portion (97) that connects the two, and the center of the core portion (97) and the axis (202a) of the rotating shaft (202) of the electric fan (83) are the same or substantially the same plane. (224) It may be arranged above. According to this configuration, since the vertical center of the core part and the axis of the cooling fan rotation axis are arranged on the same or substantially the same plane, the core part and the cooling fan are brought close to each other in the vertical direction and the front-rear direction. Even if the radiator and the cooling fan are offset upward, the suction efficiency can be improved.

In the above configuration, the internal combustion engine (71) is an OHC type in which a cylinder portion (75) extends obliquely upward and forward from a crankcase (74), and the power transmission device (72) includes the crankshaft (114). ) To a driven shaft (154) disposed behind the crankshaft (114) through a belt (158), and a continuously variable transmission mechanism (141) is provided. 114a) and the first virtual plane (223) passing through the axis (154a) of the driven shaft (154), the axis (202a) of the rotating shaft (202) of the cooling fan (81) and the internal combustion engine ( 71), the second virtual plane (224) passing through the axis (88a) of the cam shaft (88) provided in 71) may be positioned substantially in parallel. According to this configuration, the radiator, the cooling fan, and the radiator cover are offset upward until the second virtual plane is substantially parallel to the first virtual plane, so that the rear lower end of the transmission case and the lower end of the radiator are The radiator, the cooling fan, and the radiator cover can be offset upward until the height is substantially the same on both the left and right sides, making it easier to secure the bank angle.
In the above configuration, the water pump (86) is attached coaxially with the cam shaft (88), and the air vent passage (105) provided in the cooling water passage is provided with the water pump (86) and the radiator (81). ) And the radiator (81) may be provided so as to be tilted forward so that the rear part is positioned above the front part. According to this configuration, the water pump is disposed on the second virtual plane passing through the axis of the rotation axis of the cooling fan and the axis of the cam shaft, the radiator is offset upward and tilted forward, and the upper tank and the water pump are Since the air vent passage is communicated between the two, the tilt angle for venting air from the water pump to the upper tank can be secured well without making the upper tank larger than necessary. Can be reduced in size and weight.

Further, in the above configuration, the radiator (81) is disposed to be inclined so that a rear portion thereof protrudes outward in the vehicle width direction from the front portion, and from the outside along the outer surface of the radiator (81). You may make it cover with a radiator cover (189). According to this configuration, both the radiator and the radiator cover are directed toward the front of the vehicle so that the traveling wind can be easily taken in, and the traveling wind taken in by the radiator cover can easily hit the entire radiator to improve the cooling efficiency. Can do. In addition, since the traveling wind is likely to directly hit the radiator, the contribution ratio of the traveling wind can be increased in the total air volume necessary for cooling the radiator, the cooling fan can be downsized, and the cooling fan can be reduced in size. Wind noise can be reduced and silence can be increased.
Further, in the above configuration, a space (186) is provided between the radiator (81) and the crankshaft (114) so that the rear portion is wider in the vehicle width direction than the front portion. The cooling fan (83) may be accommodated. According to this configuration, since the space in which the rear portion extends in the vehicle width direction from the front portion is provided between the radiator and the crankshaft, the cooling fan can be easily accommodated in the space by being inclined.

In the above configuration, the cooling fan (83) includes a fan main body (192) including a plurality of blades arranged close to the inner surface of the radiator (81), and the fan main body (192). The drive unit (193) is driven to rotate by a rotation shaft (202), and the drive unit (193) is arranged to be offset backward with respect to the axis (114a) of the crankshaft (114). May be. According to this structure, it becomes easy to arrange | position a drive part to the rear part of space, and the space which spreads back can be used efficiently. Further, since the drive unit is tilted by being offset rearward from the axis of the crankshaft, the front part of the drive unit can be disposed close to the crankshaft and can be disposed compactly in the axial direction.
Further, in the above configuration, an enclosure (191c) surrounding the outside in the radial direction of the cooling fan (83) and an exhaust port (221) for exhausting the exhaust air that has passed through the radiator (81) to the outside are formed. A shroud (188) may be provided, and the cooling fan (83) may be attached to the shroud (188). According to this configuration, since the cooling fan is attached to the shroud having the enclosure portion and the air exhaust port, the exhaust air of the radiator can be efficiently guided to the air exhaust port by the enclosure portion and discharged from the air exhaust port to the outside. In addition, the cooling fan can be easily attached using the shroud, and the number of parts can be reduced because it is not necessary to provide a special attachment part for the cooling fan.

In the above configuration, the drive unit (193) of the cooling fan (83) may be attached to the shroud (188) by a plurality of radially provided stays (194, 195, 196). According to this configuration, the cooling fan can be stably fixed to the shroud by the plurality of stays arranged radially.
In the above configuration, the radiator (81), the shroud (188), and the cooling fan (83) can be assembled in a small size by attaching the shroud (188) to the radiator (81). You may do it. According to this configuration, since the assembly can be completed simply by fixing the radiator to the crankcase in a state where the radiator, the shroud, and the cooling fan are assembled in advance, the assemblability can be improved.
In the above configuration, the electric wires (216, 217) connected to the cooling fan (83) may be routed from the cooling fan (83) toward the front upper side. According to this structure, since the conducting wire is wired upward and upward, a space for tilting the vehicle to the side can be secured below the radiator and its related parts, and the bank angle can be easily secured. be able to.

  In the present invention, the cooling fan is an electric type, and the cooling fan, the radiator, and the radiator cover are all disposed so that the vertical centers thereof are offset upward from the axis of the crankshaft. When the radiator is arranged on the axially outer side of the internal combustion engine that is movably supported, the vertical centers of all the cooling fan, radiator, and radiator cover are arranged to be offset above the axis of the crankshaft. Therefore, it becomes easy to secure the ground clearance of the cooling fan, the radiator, and the radiator cover, and a sufficient bank angle can be secured. In particular, since the cooling fan can be electrically operated, the degree of freedom of arrangement of the cooling fan can be improved, and thus the degree of freedom of the offset amount can be improved. Furthermore, since the vertical center of the cooling fan is also offset above the axis of the crankshaft together with the radiator and the radiator cover, even if the radiator and the radiator cover are offset upward, the cooling fan passes through the radiator. The suction efficiency of outside air can be improved.

In addition, the cooling fan is provided so as to be separated from the crankshaft so as to be along the inner surface of the radiator, and the vertical centers of the cooling fan, the radiator, and the radiator cover are substantially the same height. When viewed from the axial direction of the shaft, it is easy to increase the portion where the cooling fan overlaps the radiator, and it is possible to easily perform upward offset while ensuring sufficient suction efficiency. In addition, since the cooling fan is provided apart from the crankshaft, the load during rotation of the crankshaft can be reduced, and fuel consumption can be improved.
The radiator also includes an upper tank, a lower tank disposed below the upper tank, and a core portion that connects between the upper tank and the lower tank. The center of the core portion and the rotating shaft of the electric fan Are arranged on the same or substantially the same plane, so that the core portion and the cooling fan can be brought close to each other in the vertical direction and the front-rear direction, and the radiator and the cooling fan are offset upward. The suction efficiency can be improved.

Further, the internal combustion engine is an OHC type in which the cylinder portion extends obliquely upward from the crankcase, and the power transmission device transmits power from the crankshaft to a driven shaft disposed behind the crankshaft via a belt. A second imaginary plane that includes a continuously variable transmission mechanism and that passes through the axis of the rotation axis of the cooling fan and the axis of the cam shaft included in the internal combustion engine with respect to the first imaginary plane that passes through the axis of the crankshaft and the axis of the driven shaft Are positioned substantially parallel to each other, so that when the radiator, the cooling fan, and the radiator cover are offset upward until the second virtual plane is substantially parallel to the first virtual plane, The lower end and the lower end of the radiator can be made substantially the same on the left and right sides of the vehicle body, and the bank angles can be easily secured on both the left and right sides of the vehicle body.
In addition, a water pump is mounted coaxially with the camshaft, and an air vent passage provided in the cooling water passage communicates between the water pump and the upper tank of the radiator, and the radiator has a rear portion above the front portion. Because it is provided to be tilted forward so that it is located, it is possible to secure a good tilt angle for bleeding air from the water pump to the upper tank without making the upper tank larger than necessary.・ Weight reduction can be achieved.

In addition, the radiator is inclined and arranged so that the rear part protrudes outward in the vehicle width direction from the front part, and the radiator and the radiator cover are covered with the radiator cover from the outside along the outer surface of the radiator. Both of them are directed toward the front of the vehicle so that it is easy to take in the traveling wind, and the traveling wind taken in by the radiator cover can easily strike the entire radiator to improve the cooling efficiency.
In addition, a space is provided between the radiator and the crankshaft so that the rear part is wider in the vehicle width direction than the front part, and the cooling fan is accommodated in this space. can do.

The cooling fan includes a fan main body portion including a plurality of blades arranged close to the inner side surface of the radiator, and a drive portion that rotationally drives the fan main body portion with a rotation shaft. Therefore, it is easy to dispose the drive unit in the rear part of the space, and the space that is widened rearward can be used efficiently. Further, since the drive unit is tilted by being offset rearward from the axis of the crankshaft, the front part of the drive unit can be disposed close to the crankshaft and can be disposed compactly in the axial direction.
The cooling fan includes a shroud formed with an enclosure that surrounds the outside of the cooling fan in the radial direction and an exhaust port that discharges the exhausted air that has passed through the radiator. The cooling fan is attached to the shroud. The exhaust air can be efficiently guided to the air exhaust port and discharged from the air exhaust port to the outside. In addition, the cooling fan can be easily attached using the shroud, and the number of parts can be reduced because it is not necessary to provide a special attachment part for the cooling fan.

Moreover, since the drive part of a cooling fan is attached to a shroud by the some stay provided radially, a cooling fan can be stably fixed to a shroud by the some stay arrange | positioned radially.
In addition, since the shroud is attached to the radiator, the radiator, the shroud and the cooling fan are configured so as to be able to be assembled in a small amount. Assembling can be completed by this, so that the assemblability can be improved.
In addition, since the electric wire connected to the cooling fan is routed forward and upward from the cooling fan, a space for tilting the vehicle to the side can be secured below the radiator and its related parts, The bank angle can be easily secured.

1 is a right side view showing a motorcycle to which a first embodiment of the present invention is applied. It is a right view which shows a power unit. It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows a cooling device and its periphery. It is the VV sectional view taken on the line of FIG. It is explanatory drawing which shows a radiator assembly. It is a front view which shows a radiator fixing holder. It is explanatory drawing which shows a shroud. It is an effect | action figure which shows the small assembly procedure of a radiator assembly. It is an effect | action figure which shows the assembly point of a radiator assembly. It is an action figure which shows the effect | action of a cooling device. It is explanatory drawing which shows the positional relationship of the center of a radiator, a cooling fan, and a radiator cover, and each part of a power unit. It is sectional drawing which shows the cooling device of 2nd Embodiment. It is a right view which shows the power unit of 3rd Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, descriptions of directions such as front and rear, right and left and up and down are the same as directions with respect to the vehicle body unless otherwise specified. Further, in each figure, the symbol FR indicates the front of the vehicle body, the symbol UP indicates the upper side of the vehicle body, and the symbol LE indicates the left side of the vehicle body.
<First Embodiment>
FIG. 1 is a right side view showing a motorcycle to which a first embodiment of the present invention is applied.
A motorcycle 10 as a saddle-ride type vehicle is composed of a body frame 11 serving as a skeleton, a front fork 13 that is steerably supported by a head pipe 12 that constitutes a front end portion of the body frame 11, and the front fork 13. A front wheel 16 attached to the lower end via an axle 14, a bar handle 17 attached to the upper end of the front fork 13, and a swing supported by a lower part of the vehicle body frame 11 via a link 18 so as to swing up and down. Power unit 21, a rear wheel 23 attached to the rear end portion of the power unit 21 via an axle 22, a rear cushion unit 24 passed to each of the rear portion of the body frame 11 and the rear end portion of the power unit 21, Is provided.

The vehicle body frame 11 includes a head pipe 12, a down frame 26 extending obliquely downward and rearward from the head pipe 12, and a cross extending in the vehicle width direction connected to the rear end of a horizontal portion 26 a constituting the lower portion of the down frame 26. A pipe 27 and a pair of left and right rear frames 28 and 28 (only one rear frame 28 is shown) extending obliquely upward and rearward from the left and right ends of the cross pipe 27 are provided. A cross pipe is provided.
A storage box 31 and a fuel tank 32 disposed at the rear of the storage box 31 are attached to the rear frame 28, and a seat 33 is attached to the storage box 31 so as to be openable and closable. The tank 32 is covered from above.
The power unit 21 includes a water-cooled OHC type internal combustion engine that constitutes a front portion, and a power transmission device that is integrally provided at the rear portion of the internal combustion engine and transmits the power of the internal combustion engine to the rear wheel 23. The lower part of the front part is attached to the rear end part of the link 18 via the support shaft 35 so as to be swingable up and down. Reference numeral 36 denotes an exhaust pipe connected to the internal combustion engine of the power unit 21, 37 denotes a muffler connected to the rear end of the exhaust pipe 36, and 38 denotes a heat shield cover that covers the outer side of the muffler 34.
The front and lower parts of the body frame 11, the upper part of the front fork 13, and the bar handle 17 are covered with a body cover 50.

  The vehicle body cover 50 is disposed at the rear of the front cover 51 so as to cover the top of the head pipe 12 and the front fork 13 from the front, and covers the head pipe 12, the top of the front fork 13 and the down frame 26 from the rear. A pair of left and right leg shields 53, 53 (one of which is connected to the front inner cover 52, the rear edge of the front cover 51 and the side edge of the front inner cover 52 and extends to the left and right sides and covers the driver's legs from the front. ), A floor step 54 that extends rearward from the lower ends of the front inner cover 52 and the leg shields 53 and 53 and serves as a footrest for the driver, and extends downward from left and right edges of the floor step 54. A pair of left and right side skirts 56, 56 (one side skirt 56 A center cover 57 that covers the front portion of the storage box 31 below the front edge of the seat 33, and a pair of left and right that extends rearward from the left and right rear edges of the center cover 57 to the lower side of the side edge of the seat 33. Body covers 58 and 58 (only one body cover 58 is shown), and a handle cover 59 that covers the front and rear of the central portion of the bar handle 17. Reference numeral 61 is a front fender that covers the front wheel 16 from above, 62 is a grab rail that the passenger holds, 63 is a rear fender that covers the rear wheel 23 from above, and 64 is a main stand.

FIG. 2 is a right side view showing the power unit 21.
The power unit 21 includes an internal combustion engine 71 that forms a front portion, and a power transmission device 72 that is integrally provided at the rear portion of the internal combustion engine 71.
The internal combustion engine 71 includes a crankcase 74 that houses the crankshaft 114, and a cylinder portion 75 that is attached to the front end portion of the crankcase 74. The cylinder portion 75 is a cylinder that is sequentially disposed forward from the crankcase 74. The block 76, the cylinder head 77, and the head cover 78 are configured.
A radiator 81 that dissipates heat from the coolant circulating in the internal combustion engine 71 is disposed on the right side of the crankcase 74, and a radiator cover 189 that covers the radiator 81 is disposed on the outer side of the radiator 81. The radiator 81 is also provided with an electric cooling fan 83 that approaches the inside of the radiator 81 to force the outside air to pass through and promote heat dissipation.

The cylinder part 75 is a substantially horizontal part in which the axis of the cylinder hole formed on the inside extends obliquely upward and forward, and the right side part near the connection part between the cylinder block 76 and the cylinder head 77 includes a radiator 81. A thermostat 85 for adjusting the amount of cooling water flowing through the water circulation path according to the cooling water temperature is attached, and a water pump 86 is provided on the right side of the cylinder head 77.
The thermostat 85 includes a case 85A and a valve and a valve opening / closing mechanism housed in the case 85A. The valve opening / closing mechanism expands or contracts depending on the temperature, and the opening degree of the valve changes. As a result, the amount of cooling water flowing through the radiator 81 changes and the amount of heat dissipation changes.
The case 85A includes a lower inlet 85a formed in the lower part, a front outlet 85b formed in the front part, and an upper inlet 85c formed so as to extend obliquely upward and rearward from the upper part.
The water pump 86 is driven by a cam shaft 88 mounted in the cylinder head 77. A pump cover 91 provided in the water pump 86 is attached to the right side surface of the cylinder head 77 and the head cover 78 with a plurality of bolts 92, and includes a pump suction port 91a projecting rearward, a pump discharge port 91b projecting obliquely rearward downward, And a pump air vent 91c protruding upward.

The radiator 81 is a component that is tilted forward so that the rear portion is positioned higher than the front portion. The radiator 81 includes an upper tank 95, a lower tank 96 disposed below the upper tank 95, and an upper portion thereof. It consists of a core portion 97 provided between the tank 95 and the lower tank 96. The core portion 97 is composed of a plurality of pipes communicating between the upper tank 95 and the lower tank 96 and fins passed between adjacent pipes, and heat of the cooling water flowing in the plurality of pipes is transferred from the fins to the outside. discharge.
The upper tank 95 is provided with a cooling water inlet 95a that extends obliquely forward and downward.
The lower tank 96 is provided with a cooling water discharge port 96a extending obliquely upward in the forward direction, and a lower inflow port 85a of the thermostat 85 is connected to the cooling water discharge port 96a via the lower radiator hose 101. The front outlet 85 b of the thermostat 85 is connected to the pump inlet 91 a of the water pump 86. The upper inflow port 85 c of the thermostat 85 is connected to one end of the bifurcated upper connecting pipe 103 at the end attached to the cylinder head 77 via the bypass hose 102. The upper connecting pipe 103 communicates with a water jacket formed in the cylinder head 77.

A pump discharge port 91 b of the water pump 86 is connected to a lower connection port 76 a formed in the cylinder block 76 via a discharge hose 104. The lower connection port 76 a communicates with a water jacket formed in the cylinder block 76. The water jacket in the cylinder block 76 communicates with the water jacket in the cylinder head 77.
The pump air vent 91 c is connected to the base portion of the upper connecting pipe 103 via the air vent hose 106.
The other tip of the upper connecting pipe 103 is connected to a cooling water suction port 95 a of the upper tank 95 via an upper radiator hose 107.
The pump air vent 91c, the air vent hose 106, the upper connecting pipe 103, the upper radiator hose 107, and the upper tank 95 of the radiator 81 constitute an air vent passage 105 inclined rearward.
The lower radiator hose 101, the bypass hose 102, the upper connecting pipe 103, the discharge hose 104, the air vent hose 106, the upper radiator hose 107, the water jacket of the cylinder block 76, and the water jacket of the cylinder head 77 are connected to the cooling water circulation path. Hose 108 which comprises these is comprised.

Next, the flow of the cooling water in the cooling water passage described above will be described.
During normal operation of the internal combustion engine 71, the cooling water discharged from the pump discharge port 91 b of the water pump 86 flows into the water jacket of the cylinder block 76 through the discharge hose 104, and further, the water jacket in the cylinder head 77. Into the upper tank 95 from the upper connecting pipe 103 through the upper radiator hose 107, and into the lower tank 96 through the core 97 from the upper tank 95. When the cooling water flows through the core portion 97, the heat of the cooling water is released to the outside, and the cooling water temperature decreases.
Further, the cooling water passes from the lower tank 96 through the lower radiator hose 101 into the thermostat 85. In this case, in the thermostat 85, the cooling water passage from the lower inlet 85a to the front outlet 85b is opened, and the cooling water passage from the lower inlet 85a to the upper inlet 85c and the upper inlet 85c to the front outlet 85b. Since the cooling water passage is closed, the cooling water flows from the thermostat 85 to the water pump 86 and repeats the above circulation.

  During the warm-up operation immediately after the internal combustion engine 71 is started, in the thermostat 85, the cooling water passage extending from the lower inlet 85a to the front outlet 85b and the cooling water passage extending from the lower inlet 85a to the upper inlet 85c are closed, The cooling water passage from the upper inlet 85c to the front outlet 85b is opened. Therefore, the cooling water discharged from the pump discharge port 91b of the water pump 86 flows into the water jacket of the cylinder block 76 through the discharge hose 104, and further flows into the water jacket in the cylinder head 77, and is connected to the upper connection. It flows from the pipe 103 through the bypass hose 102 to the thermostat 85 and reaches the water pump 86 to repeat the above circulation. Therefore, since the cooling water does not flow into the radiator 81, heat radiation from the radiator 81 is suppressed, the cooling water temperature is easily increased, and warm-up is promoted.

  Further, the air mixed in the cooling water passage flows from the pump air vent 91c of the water pump 86 through the air vent hose 106 into the upper connecting pipe 103, and further passes through the upper radiator hose 107 inclined rearward. Pass through to the upper tank 95. Then, the air reaches the reserve tank through the hose from the reserve tank side connection port formed in the water supply port 95m of the upper tank 95, and is discharged outside.

3 is a cross-sectional view taken along line III-III in FIG.
The internal combustion engine 71 constituting the power unit 21 includes a crankcase 74 composed of a left case half 111 and a right case half 112 divided into left and right, a cylinder block 76 attached to the front end of the crankcase 74, and the cylinder A cylinder head 77 attached to the front end of the block 76 via a head gasket (not shown), a head cover 78 that closes an opening provided at the front end of the cylinder head 77, and bearings 113, 113 on the crankcase 74. A crankshaft 114 having an axis 114a extending in the vehicle width direction, a connecting rod 117 having one end pivotably connected to a crankpin 116 of the crankshaft 114, and a connecting rod 117 Connected to other end via piston pin 118 And a piston 121 movably inserted into a cylinder hole 76 b formed in the cylinder block 76, an ignition plug 122 attached to the cylinder head 77, and an AC generator attached to one end of the crankshaft 114 with a nut 123. 124 (specifically, the inner rotor 125 that constitutes the AC generator 124) and a cooling device 128 that is partially disposed outside the AC generator 124.
The cylinder head 77 includes a cylinder head main body 131 and a cam shaft 88 rotatably attached to the cylinder head main body 131 via bearings 132 and 132, and a water pump 86 is formed at one end of the cam shaft 88. The pump shaft 135 is mounted on the extension of the axis 88a of the cam shaft 88 by bolts 136 and 136. That is, the water pump 86 is provided coaxially with the cam shaft 88.
The AC generator 124 includes an inner rotor 125 attached to one end of the crankshaft 114 and an outer stator 126 attached to the right case half 112 and disposed so as to surround the outer periphery of the inner rotor 125.

The power transmission device 72 constituting the power unit 21 includes a belt-type continuously variable transmission mechanism 141 adjacent to the internal combustion engine 71 and a speed reduction mechanism 142 coupled to the rear portion of the continuously variable transmission mechanism 141. This is the part that transmits the generated power to the rear wheel 23.
The continuously variable transmission mechanism 141 includes a transmission case main body 144 integrally provided at the rear of the right case half body 112 and a transmission case cover 145 that closes the left opening of the transmission case main body 144, and the transmission case. 146 and a transmission main body 147 disposed on the inner side.
The transmission main body 147 includes a drive pulley 151 attached to the other end portion of the crankshaft 114 serving as a drive shaft, and a driven shaft 154 rotatably attached to the rear portion of the transmission case 146 via bearings 152 and 153. A driven pulley 156 and a centrifugal clutch 157 attached to the driven shaft 154, and a belt 158 stretched over each of the driving pulley 151 and the driven pulley 156. The belt 158 is connected to the driven shaft 154 from the crankshaft 114. Power is transmitted. Reference numeral 154a denotes an axis of the driven shaft 154, and 159 denotes a kick starter connected to the other end of the crankshaft 114.

The speed reduction mechanism 142 includes a speed reducer case 163 attached to the rear right side of the transmission case main body 144, a first gear 164 that meshes with a gear portion integrally formed with the driven shaft 154, and the first gear 164 integrally. A support shaft 166 to be supported, and a second gear 167 that meshes with a gear portion formed on the support shaft 166 and is integrally supported by the axle 22 of the rear wheel 23.
One end of the driven shaft 154 is rotatably supported by a bearing 171 provided in the speed reducer case 163. Both ends of the support shaft 166 are rotatably supported by bearings 172 and 173. The axle 22 is rotatably supported by bearings 175 and 176 provided in the transmission case main body 144 and the speed reducer case 163, respectively, and extends rearward from the right case half 112 and is disposed on the right side of the rear wheel 23. The arm portion 177 is supported via a bearing 178. Reference numeral 181 denotes a rear wheel brake provided in the speed reducer case 163 for braking the rear wheel 23.

FIG. 4 is a cross-sectional view showing the cooling device 128 and its surroundings, and is an enlarged view of the main part of FIG.
The cooling device 128 is disposed in a radiator 81 arranged on the outer side in the axial direction of the crankshaft 114 and a space 186 between the radiator 81 and the crankshaft 114, and promotes the passage of air in the radiator 81 to force the radiator 81. An electric cooling fan 83 for cooling, a shroud 188 disposed so as to surround the radiator 81 and the cooling fan 83, and attached to the shroud 188, on the outer side of the outer surface 81 a of the radiator 81, on the front and rear of the radiator 81 A radiator cover 189 arranged to surround and cover the upper and lower sides, a water pump 86 (see FIG. 2), and hoses 108 (see FIG. 2) constituting a cooling water circulation path from the water pump 86 to the radiator 81. And a thermostat 85 (see FIG. 2).

The radiator 81 is attached to the right side portion of the right case half 112 via a radiator fixing holder (not shown), and is disposed so as to be inclined so that the rear portion of the radiator 81 projects outward in the vehicle width direction from the front portion.
The space 186 is a portion surrounded by the inner surface 81b of the radiator 81, the crankshaft 114, the AC generator 124, and the shroud 188, and is formed so that the rear portion is wider than the front portion in the vehicle width direction. .
The cooling fan 83 includes a fan main body portion 192 disposed so that the front end surface 192a approaches the inner side surface 81b of the radiator 81, and a drive portion 193 including a motor that drives the fan main body portion 192. A plurality of cooling fan mounting portions 188a provided on the shroud 188 via flanges 193a provided on the drive portion 193 via a plurality of stays 194, 195, 196 (shown only on the stays 194, 196) provided radially. 188b and 188c (only the cooling fan mounting portions 188a and 188c are shown) are fixed. Reference numerals 198 and 199 denote bolts and nuts for fastening the stays 194, 195, and 196 to the shroud 188, which are fastened from the opposite side of the radiator 81, that is, the crankcase 74 (see FIG. 3) side with the cooling fan 83 interposed therebetween. The Since the flange portion 193a is inclined with respect to the vehicle front-rear direction and the cooling fan mounting portions 188a, 188b, 188c extend in the vehicle front-rear direction, the stays 194, 195, 196 are bent.
The fan main body 192 is attached to a rotating shaft 202 provided in the driving unit 193.
The axis 202a of the rotating shaft 202 is inclined by an angle θ with respect to the axis 114a of the crankshaft 114, and is orthogonal or almost orthogonal to the inner surface 81b of the radiator 81. The drive unit 193 is disposed offset to the rear of the vehicle with respect to the axis 114a.

The shroud 188 is attached to the radiator 81 by a plurality of screws (not shown), and is disposed so as to surround the radiator 81 and the cooling fan 83, and regulates the flow direction of the exhaust air that has passed through the radiator 81 so that the flow is smooth. To do.
The radiator cover 189 is attached to a plurality of radiator cover attaching portions 188d formed at the edge of the shroud 188, and is integrally formed with the side wall portion 189a positioned around the radiator 81 and the cooling fan 83, and the side wall portion 189a. The louver 189b is arranged so as to approach along the outer side surface 81aa of the radiator 81.
The side wall portion 189 a includes a plurality of shroud attachment portions 189 c fastened to the radiator cover attachment portion 188 d of the shroud 188 with bolts 204 and nuts 205.
The louver 189b is disposed so that the rear part protrudes outward in the vehicle width direction from the front part so that the whole of the louver 189b approaches along the outer side surface 81a of the radiator 81, and both ends thereof are integrally connected to the side wall part 189a. It consists of a plurality of slats 207 arranged in parallel. Between the adjacent slats 207, 207, a gap 208 into which the traveling wind enters is formed. The cross section of the wing plate 207 extends obliquely to the front side, and it is easy to take the traveling wind into the radiator 81 side.

5 is a cross-sectional view taken along line VV in FIG.
A radiator fixing holder 211 is attached to a side end portion of the right case half 112 of the crankcase 74 with a plurality of bolts 209, and a radiator 81 is attached to the radiator fixing holder 211 with a plurality of bolts 212, and a plurality of screws are attached to the radiator 81. A shroud 188 is attached at 213, and a cooling fan 83 and a radiator cover 189 are attached to the shroud 188.
The radiator fixing holder 211 includes a flat portion 211a extending along the end surface of the right case half 112, and a plurality of rising portions 211b that are integrally raised from the flat portion 211a. A bolt 209 is attached to the flat portion 211a. A plurality of bolt insertion holes 211d are formed, female threads 211e for screwing the bolts 212 are formed at the tip of the rising portion 211b, and the radiator 81 is attached to the right case half body 112 via the radiator fixing holder 211. It has been. Reference numeral 112e denotes a screw formed on the right case half 112 for screwing the bolt 209.
The radiator 81 is supported by the radiator fixing holder 211 in a standing state so as to extend in the vertical direction.
The inner end surface 188 e of the shroud 188 is in contact with or close to the outer surface 211 c of the flat portion 211 a of the radiator fixing holder 211.

A center line 97A representing the center in the vertical direction of the radiator 81, that is, the center in the vertical direction of the core portion 97 of the radiator 81, and the center line in the vertical direction of the cooling fan 83, that is, the axis 202a of the rotating shaft 202 in the drive unit 193 The center line 189A indicating the center in the vertical direction of the radiator cover 189, that is, the center of the length from the upper end to the lower end of the radiator cover 189, is arranged so as to coincide or substantially coincide with the horizontally extending center line 214. The center line 97A, the axis 202a, the center line 189A, and the center line 214 are arranged so as to be offset by a distance LA above the axis 114a of the crankshaft 114.
The center line 97 </ b> A of the core part 97 is also the center line of the core part 97 in the front-rear direction.
A plane 210A that is in contact with the front or rear tire and the lower end of the radiator 81 or the radiator cover 189 is inclined by an angle θA with respect to a horizontal plane 210B (corresponding to a tire contact surface). In the present embodiment, since the radiator 81 and the radiator cover 189 are arranged further upward, the angle θA becomes larger and a sufficient bank angle of the vehicle can be ensured.

FIG. 6 is an explanatory view showing the radiator assembly 215, as seen from the direction of the arrow VI in FIG.
The radiator 81, the cooling fan 83 and the shroud 188 constitute a radiator assembly 215.
The upper tank 95 of the radiator 81 includes a water supply port 95 m protruding upward, and the water supply port 95 m is closed by a radiator cap 98.
Two electric wires 216 and 217 extending obliquely upward and forward are connected to the driving unit 193 of the cooling fan 83, and electric power is supplied to the driving unit 193 through these electric wires 216 and 217. Reference numeral 218 denotes a connector attached to the tips of the electric wires 216 and 217.
The cooling device 128 (see FIG. 3) includes a control device (not shown) that controls the supply of electric power to the drive unit 193 based on the coolant temperature.
The radiator 81 and the shroud 188 are covered from the side by a radiator cover 189 except for their lower ends.

Prior to attaching the radiator 81 to the crankcase 74 (see FIG. 2), the radiator assembly 215 is assembled in advance.
The radiator 81 includes upper mounting portions 95 b and 95 c formed at the front and rear portions of the upper tank 95 and a lower mounting portion 96 d formed at the lower portion of the lower tank 96 in order to mount the shroud 188.
The shroud 188 is attached to the upper mounting portions 95b and 95c and the lower mounting portion 96d of the radiator 81 with screws 213, respectively. A downward extending portion 188h is formed.

Further, the shroud 188 includes a plurality of radiator cover mounting portions 188d formed at the front portion and the rear portion for mounting the radiator cover 189, and bolts 204 (see FIG. 4) are respectively inserted into the radiator cover mounting portions 188d. A bolt insertion hole 188n is formed.
Furthermore, the shroud 188 has cooling fan mounting portions 188a, 188b, and 188c for mounting the stays 194, 195, and 196 of the cooling fan 83 in a shroud opening 188p provided in the center.
In order to mount the small assembled radiator assembly 215 to the radiator fixing holder 211 (see FIG. 5), the radiator 81 includes upper holder mounting portions 95e and 95f formed at the front and rear portions of the upper tank 95, and The lower holder attaching parts 96g and 96h formed in the lower part of the tank 96 are provided.

FIG. 7 is a front view showing the radiator fixing holder 211.
In the radiator fixing holder 211, a plurality of raised portions 211b are formed integrally with an annular flat portion 211a, a plurality of bolt insertion holes 211d are formed in the flat portion 211a, and female screws 211e are formed on the raised portions 211b, respectively. Yes.
For example, when attaching a radiator to the crankcase via a radiator fixing holder, prepare multiple cylindrical collars, place these collars between the radiator fixing holder and the radiator, and pass bolts through the radiator and collar. Although it is possible to screw-connect the tip of the bolt to the radiator fixing holder, in this case, the number of parts increases and the positioning of each collar is required, which increases the number of assembly steps.
On the other hand, in the present embodiment, the rising portion 211b corresponding to the collar is a radiator fixing holder 211 integrally formed with the annular flat portion 211a, so that the number of components is reduced and the component is a single component. Therefore, positioning becomes easy. Therefore, it is possible to reduce costs and improve assembly.

8A and 8B are explanatory views showing the shroud 188. FIG. 8A is a view seen from the direction of the arrow VI in FIG. 3, and FIG. 8B is a view seen from the back side of the shroud 188 shown in FIG. It is a figure.
As shown in FIG. 8A, the shroud 188 includes a rectangular frame portion 191a formed in substantially the same shape as the outer shape of the core portion 97 (see FIG. 6) of the radiator 81 (see FIG. 6), and the frame portion. A vertical wall portion 191b extending inward from 191a, a shroud opening portion 188p formed in the vertical wall portion 191b, and radiator attachment portions 188f and 188g formed at the upper and lower portions of the frame portion 191a for attachment to the radiator 81 In order to attach the lower extension 188h and the radiator cover 189 (see FIG. 6), a plurality of radiator cover attachment portions 188d formed at the front and rear portions and the shroud 188 are disposed so as to be sandwiched between the radiator 81 and the radiator 81. In order to avoid interference with the rising portion 211b (see FIG. 5) of the radiator fixing holder 211 (see FIG. 5), the downward extending portion 18 is used. And a hole-shaped relief portion 188r provided on h and notch-shaped relief portion 188S.

As shown in FIG. 8B, the shroud 188 includes an inner standing wall 191c formed so as to protrude inward of the engine from the edge of the shroud opening 188p to the upper outer edge of the downward extension 188h. And a plurality of rectifying fins 191d formed below the inner standing wall 191c and spaced along the lower edge of the downward extending portion 188h. Between the adjacent rectifying fins 191d, an air exhaust port 221 is provided.
The inner upright wall 191c is a portion that surrounds the cooling fan 83 (see FIG. 6), stabilizes the flow of air generated by the cooling fan 83, and guides it to the exhaust port 221.
The rectifying fins 191d and the exhaust port 221 are portions that discharge the air that has passed through the radiator 81 (see FIG. 6) and flowed into the space 186 (see FIG. 4) in a predetermined direction (downward).
Thus, the inward standing wall 191c, the rectifying fin 191d, and the air exhaust port 221 form an exhaust air exhaust passage of the radiator 81.

Next, the small assembly procedure of the radiator assembly 215 described above will be described.
FIG. 9 is an operation diagram showing a small assembly procedure of the radiator assembly 215.
First, the stays 194, 195, 196 of the cooling fan 83 are attached to the cooling fan mounting portions 188a, 188b, 188c of the shroud 188 with bolts and nuts, respectively, as indicated by arrows A, B, C.
Next, the radiator attaching portions 188f and 188g and the downward extending portion 188h of the shroud 188 are attached to the upper attaching portions 95b and 95c and the lower attaching portion 96d of the radiator 81 with screws as indicated by arrows D, E and F. . Thus, the radiator assembly 215 is completed.

Next, the procedure for assembling the radiator assembly 215 to the crankcase 74 will be described below.
FIG. 10 is an operation diagram showing an assembling procedure of the radiator assembly 215.
The plurality of bolt insertion holes 211d of the radiator fixing holder 211 are aligned with the case side radiator mounting portions 112a, 112b, 112c, 112d of the right case half 112 in the crankcase 74 as shown by arrows G, H, J, K. The radiator fixing holder 211 is assembled to the right case half 112 by inserting the bolts into the respective bolt insertion holes 211d and screwing the ends of the bolts to the female screws of the case side radiator mounting portions 112a, 112b, 112c, 112d. wear.
Next, the upper holder mounting portions 95e and 95f and the lower holder mounting portions 96g and 96h of the radiator 81 are aligned with the plurality of rising portions 211b of the radiator fixing holder 211 as indicated by arrows L, M, P, and Q. The radiator assembly 215 is assembled to the radiator fixing holder 211 by fastening the mating portions with bolts. Thus, the assembly of the radiator assembly 215 to the crankcase 74 is completed.

Next, the operation of the cooling device 128 described above will be described.
FIG. 11 is an operation diagram showing the operation of the cooling device 128.
While the vehicle is traveling, the traveling wind flowing from the front to the rear on the side of the vehicle is louvered 189b of the radiator cover 189 that is inclined so that the rear part protrudes outward in the vehicle width direction from the front part as indicated by the arrow. Specifically, the plurality of slats 207 provided in the louver 189b are taken into the radiator cover 189 from the plurality of gaps 208, and from the outer surface 81a of the radiator 81 to the inside of the radiator 81. It flows between the pipes and flows into a space 186 between the radiator 81 and the crankshaft 114.
Because of such a configuration, it is possible to cool the radiator 81 by generating the air flow indicated by the arrow without operating the cooling fan 83. When the cooling water temperature is high, the cooling fan 83 can be operated to increase the speed of the air flow indicated by the arrow to improve the cooling capacity.
Thus, in the present embodiment, by tilting both the radiator 81 and the radiator cover 189, the flow angle α before and when the air passes through the radiator 81 can be made larger than before. The air flow can be made smooth and the decrease in the flow velocity can be suppressed. Further, by arranging the fan main body 192 of the cooling fan 83 so as to be along the inner side surface 81b of the radiator 81, the suction efficiency of the air passing through the radiator 81 can be increased. Further, as described above, since the structure is such that outside air is easily taken into the radiator 81, the time and frequency of operating the cooling fan 83 can be reduced, and the power consumption can be suppressed.

FIG. 12 is an explanatory diagram showing the positional relationship between the center of the radiator 81, the cooling fan 83 and the radiator cover 189 and each part of the power unit 21. In addition, although the axis line 202a and the center line 214 in the figure are inclined by an angle θ with respect to the vehicle width direction as shown in FIG. 4, they are indicated by black circles in FIG.
The center line 214, which is the center in the vertical direction of the radiator 81, the cooling fan 83, and the radiator cover 189, is arranged above the axis 114 a of the crankshaft 114, so that the axis 114 a of the crankshaft 114 and the continuously variable transmission mechanism 141 are driven. A second imaginary plane 224 that passes through the axis 202a of the rotation shaft 202 of the cooling fan 83 and the axis 88a of the cam shaft 88 with respect to the first imaginary plane 223 (portion indicated by the alternate long and short dash line) passing through the axis 154a of the axis 154. (Parts indicated by alternate long and short dash lines) are substantially parallel.
In this case, the radiator 81, the cooling fan 83, and the radiator cover 189 are offset upward until the second virtual plane 224 is substantially parallel to the first virtual plane 223, whereby the rear lower end of the transmission case 146 and the radiator 81 are The radiator 81, the cooling fan 83, and the radiator cover 189 can be offset upward until the lower end becomes substantially the same height on the left and right sides of the vehicle body, making it easier to secure the bank angle.

As shown in FIGS. 1, 3, and 5, the crankshaft 114 is rotatably arranged such that its axis 114 a faces the vehicle width direction, and the radiator 81 is disposed on the outer side in the axial direction of the crankshaft 114. The cooling fan 83 is disposed between the crankshaft 114 and the radiator 81, and the outside of the radiator 81 is covered with the radiator cover 189, and the power transmission device 72 and the power transmission device 72 are disposed. In the water-cooled internal combustion engine 71 of the motorcycle 10 as a saddle-ride type vehicle in which the internal combustion engine 71 is swingably supported by the vehicle body frame 11 together with the rear wheel 23 that receives power from the cooling fan 83, the cooling fan 83 is electrically operated. The vertical centers of the cooling fan 83, the radiator 81, and the radiator cover 189 are all above the axis 114a of the crankshaft 114. It is arranged to offset.
According to this configuration, when the radiator 81 is disposed on the outer side in the axial direction of the internal combustion engine 71 that is swingably supported by the vehicle body frame 11, the vertical centers of the cooling fan 83, the radiator 81, and the radiator cover 189 are all provided. Are arranged such that the axis 202a, the center line 97A, and the center line 189A are offset above the axis 114a of the crankshaft 114, so that the ground clearance of the cooling fan 83, the radiator 81, and the radiator cover 189 can be secured. It becomes easy and a sufficient bank angle can be secured. In particular, since the cooling fan 83 is electrically operated, the degree of freedom of arrangement of the cooling fan 83 can be improved, and thus the degree of freedom of the offset amount can be improved. Furthermore, since the center of the cooling fan 83 along with the radiator 81 and the radiator cover 189 is also offset above the axis 114a of the crankshaft 114, the cooling fan 83 can be disposed so as to face the center of the core portion 97. In addition, it is possible to improve the suction efficiency of the outside air passing through the radiator 81 by the cooling fan 83.

4 and 5, the cooling fan 83 is provided so as to be separated from the crankshaft 114 and close to the inner side surface 81b of the radiator 81, and the cooling fan 83, the radiator 81, and the radiator cover are provided. Since the vertical centers of 189 are substantially the same height, it is easy to increase the portion where the cooling fan 83 overlaps the radiator 81 when viewed from the axial direction of the crankshaft 114, and the suction efficiency is sufficiently increased. It is possible to easily offset upward while ensuring. In addition, since the cooling fan 83 is provided apart from the crankshaft 114, the load during rotation of the crankshaft 114 can be reduced, and fuel consumption can be improved.
As shown in FIGS. 5 and 6, the radiator 81 connects the upper tank 95, a lower tank 96 disposed below the upper tank 95, and the upper tank 95 and the lower tank 96. Since the center of the core portion 97 and the axis 202a of the rotating shaft 202 of the electric fan 83 are disposed on the second virtual plane 224 as the same or substantially the same plane, The core portion 97 and the cooling fan 83 can be brought close to each other in the direction, and the suction efficiency can be improved even when the radiator 81 and the cooling fan 83 are offset upward.

As shown in FIGS. 3 and 12, the internal combustion engine 71 is an OHC type in which a cylinder portion 75 extends substantially horizontally from the crankcase 74 to the front, more specifically, obliquely upward to the front, and the power transmission device 72 is And a continuously variable transmission mechanism 141 for transmitting power from the crankshaft 114 to a driven shaft 154 disposed behind the crankshaft 114 via a belt 158, and an axis 114a of the crankshaft 114 and an axis 154a of the driven shaft 154 Since the second virtual plane 224 passing through the axis 202a of the rotation shaft 202 of the cooling fan 83 and the axis 88a of the cam shaft 88 included in the internal combustion engine 71 is positioned substantially parallel to the first virtual plane 223 passing through Raise the radiator 81, the cooling fan 83, and the radiator cover 189 upward until the second virtual plane 224 is substantially parallel to the first virtual plane 223. When frustrated, the lower end of the transmission case 146 provided on the driven shaft 154 side and the lower end of the radiator 81 can be made substantially the same height on the left and right sides of the vehicle body, and bank angles are secured on both the left and right sides of the vehicle body. It can be made easier.
2 and 3, a water pump 86 is attached coaxially with the camshaft 88, and an air vent passage 105 provided in the cooling water passage is provided between the water pump 86 and the upper tank 95 of the radiator 81. The radiator 81 is provided so as to be tilted forward so that the rear portion is positioned higher than the front portion. Therefore, the radiator 81 passes through the axis 202a of the rotating shaft 202 of the cooling fan 83 and the axis 88a of the cam shaft 88. Since the water pump 86 is disposed on the second virtual plane 224 and the radiator 81 is offset upward and tilted forward, the air vent passage 105 is communicated between the upper tank 95 and the water pump 86. Even if 95 is not increased more than necessary, it is possible to ensure a good inclination angle for bleeding air from the water pump 86 to the upper tank 95. Can be, it is possible to reduce the size and weight of the upper tank 95.

As shown in FIGS. 2 and 4, the radiator 81 is disposed so that the rear portion thereof is inclined so as to protrude outward in the vehicle width direction from the front portion, and outward along the outer surface of the radiator 81. Since the radiator 81 and the radiator cover 189 cover the radiator 81, the radiator 81 and the radiator cover 189 are both directed toward the front of the vehicle so that the traveling wind can be easily taken in, and the traveling wind taken in by the radiator cover 189 is easily applied to the entire radiator 81. Cooling efficiency can be improved.
As shown in FIG. 4, a space 186 is provided between the radiator 81 and the crankshaft 114 so that the rear portion is wider in the vehicle width direction than the front portion. The cooling fan 83 is accommodated in the space 186. Therefore, the cooling fan 83 can be easily accommodated in the space 186 by being inclined.

The cooling fan 83 includes a fan main body 192 having a plurality of blades arranged close to the inner side surface 81 b of the radiator 81, and a drive unit 193 that rotates the fan main body 192 with the rotation shaft 202. Since the drive unit 193 is arranged to be offset rearward with respect to the axis 114a of the crankshaft 114, the drive unit 193 can be easily arranged at the rear part of the space 186, and the space 186 that is widened rearward is used efficiently. be able to. Further, since the drive unit 193 is tilted with an offset to the rear of the axis 114a of the crankshaft 114, the front part of the drive unit 193 can be disposed close to the crankshaft 114, and is disposed compactly in the axial direction. can do.
Further, as shown in FIGS. 4, 6, and 8 (A) and 8 (B), exhaust air that has passed through the radiator wall 81 and the inner standing wall 191 c that surrounds the radially outer side of the cooling fan 83. Since the cooling fan 83 is attached to the shroud 188, the exhaust air from the radiator 81 is efficiently guided to the air exhaust port 221 by the inner standing wall 191c. Thus, the air can be discharged from the air exhaust port 221 to the outside. Further, the cooling fan 83 can be easily attached using the shroud 188, and it is not necessary to provide a special attachment portion for the cooling fan 83, so that the number of parts can be reduced.

Further, as shown in FIGS. 4, 6, 8A, 8B, and 9, the driving unit 193 of the cooling fan 83 is shroud by a plurality of stays 194, 195, and 196 provided radially. Since it is attached to 188, the cooling fan 83 can be stably fixed to the shroud 188 by the plurality of stays 194, 195, 196 arranged radially.
Further, as shown in FIGS. 5, 6, and 9, since the shroud 188 is attached to the radiator 81, the radiator 81, the shroud 188, and the cooling fan 83 are configured so as to be able to be assembled. Assembling can be completed simply by fixing the radiator 81 to the crankcase 74 in a state where the shroud 188 and the cooling fan 83 are assembled in advance, so that the assembling property can be improved.
Further, as shown in FIGS. 6 and 9, the electric wires 216 and 217 connected to the cooling fan 83 are routed forward and upward from the cooling fan 83, so that the radiator 81 and its related parts are located below the radiator 81 and its related parts. The space for tilting the vehicle to the side can be secured, and the bank angle can be easily secured.

Second Embodiment
FIG. 13 is a cross-sectional view showing the cooling device 225 of the second embodiment.
The cooling device 225 is different in the arrangement of the radiator 81 and the cooling fan 83 from the cooling device 128 of the first embodiment shown in FIG. In other words, the cooling device 225 includes the radiator 81 (specifically, the core portion 97 of the radiator 81) disposed outside the axial direction of the crankshaft 114 and perpendicular to the axis 114 a of the crankshaft 114. 83 is disposed in the space 226 between the crankshaft 114 and the radiator 81, the axis 202a of the rotating shaft 202 and the center line 97A of the core portion 97 are disposed on the extension of the axis 114a, and the fan main body 192. The tip surface 192a of the radiator 81 is approaching along the inner surface 81b of the radiator 81.
A shroud 227 is attached to the radiator 81, and a cooling fan 83 and a radiator cover 189 are attached to the shroud 227.
The cooling fan 83 has a plurality of radially extending stays 228 attached to the flange portion 193 a of the drive unit 193, and these stays 228 are attached to a plurality of cooling fan mounting portions 227 a provided on the shroud 227 with bolts 198 and nuts 199. Installed.
The point which arrange | positions so that the center of each up-down direction of the radiator 81, the cooling fan 83, and the radiator cover 189 may be offset upwards with respect to the axis line 114a of the crankshaft 114 is the same as that of 1st Embodiment.

<Third Embodiment>
FIG. 14 is a right side view showing the power unit 231 of the third embodiment.
The power unit 231 is different from the cooling device 128 of the power unit 21 of the first embodiment shown in FIG.
The cooling device 232 does not include the thermostat 85 (see FIG. 2) with respect to the cooling device 128, and the layout of the hoses 108 (see FIG. 2) due to the elimination of the thermostat 85 is different.
That is, the cooling device 232 includes a radiator 81, a cooling fan 83, a shroud 188 (see FIG. 6), a radiator cover 189, a water pump 233 provided on the right side of the cylinder head 77, and the water pump 233 to the radiator. Hose 234 which constitutes a cooling water circulation path to 81.
The water pump 233 includes a pump cover 236, a pump suction port 236 a and a pump discharge port 91 b are formed in the lower part of the pump cover 236, and a pump air vent port 91 c is formed in the upper part of the pump cover 236.
The hoses 234 include a lower radiator hose 237 connected to each of the cooling water discharge port 96a of the lower tank 96 and the pump suction port 236a of the water pump 233, the upper connection pipe 103, the discharge hose 104, and the air bleeding hose 106. And an upper radiator hose 107, a water jacket for the cylinder block 76, and a water jacket for the cylinder head 77.

The flow of the cooling water in the cooling water passage will be described below.
During normal operation of the internal combustion engine 71, the cooling water discharged from the pump discharge port 91 b of the water pump 86 flows into the water jacket of the cylinder block 76 through the discharge hose 104, and further, the water jacket in the cylinder head 77. From the upper connecting pipe 103 through the upper radiator hose 107 and into the upper tank 95, and from the upper tank 95 through the core portion 97 into the lower tank 96. Further, the cooling water flows from the lower tank 96 through the lower radiator hose 101 to the water pump 233 and repeats the above circulation.
During the normal operation described above, when the cooling water temperature is low, the operation of the cooling fan is stopped by the control of the control device, and when the cooling water temperature becomes high and reaches a predetermined temperature, the cooling fan is operated.
Further, during the warm-up operation immediately after the internal combustion engine 71 is started, the operation of the cooling fan is stopped until the cooling water temperature reaches a specified temperature under the control of the control device.

As described above, by eliminating the thermostat, the cost related to the thermostat and the hoses connected to the thermostat can be reduced, and another space is provided in the side space of the cylinder portion 75 where the thermostat is disposed. Parts can be arranged, and the space can be effectively used.
Even if the thermostat is abolished, the coolant temperature during normal operation and warm-up operation can be controlled with a simple response of changing the operation control program of the cooling fan 83 in the control device.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.
For example, as shown in FIG. 5, the center line 97A of the radiator 81, the axis 202a of the cooling fan 83, and the center line 189A of the radiator cover 189 are arranged on the same center line 214. Not limited to this, it is only necessary that at least the center line 97A and the axis 202a are on the same or substantially the same center line 214. Alternatively, none of the center line 97A, the axis line 202a, and the center line 189A need be on the same center line 214. In short, the center line 97A, the axis line 202a, and the center line 189A may be arranged so as to be offset upward from the axis line 114a of the crankshaft 114.
Further, as shown in FIG. 13, the center line 97A of the core portion 97 of the radiator 81 and the axis line 202a of the rotating shaft 202 of the cooling fan 83 are arranged on the extension of the axis line 114a of the crankshaft 114. Instead, the center line 97A and the axis line 202a may be offset from the axis line 114a in a direction orthogonal to the axis line 114a. In this case, the center line 97A and the axis line 202a may be arranged on the same straight line parallel to the axis line 114a.

10 Motorcycles (saddle-ride type vehicles)
DESCRIPTION OF SYMBOLS 11 Body frame 23 Rear wheel 71 Internal combustion engine 72 Power transmission device 74 Crankcase 75 Cylinder part 81 Radiator 83 Cooling fan 86,233 Water pump 88 Camshaft 88a Axis 105 Air vent passage 114 Crankshaft 114a Axis 141 Continuously variable transmission mechanism 154 Shaft 154a Axis 158 Belt 186, 226 Space 188, 227 Shroud 189 Radiator cover 191c Inner standing wall (enclosure)
192 Fan body part 193 Drive part 194, 195, 196, 228 Stay 202 Rotating shaft 202a Axis line 214 Center line 216, 217 Electric wire 221 Air exhaust port 223 First virtual plane 224 Second virtual plane (plane)

Claims (12)

The crankshaft (114) is rotatably disposed such that its axis (114a) is directed in the vehicle width direction, and the radiator (81) is disposed on the axially outer side of the crankshaft (114) so as to be disposed in the internal combustion engine (71). ), A cooling fan (83) is disposed between the crankshaft (114) and the radiator (81), and an outer side of the radiator (81) is covered with a radiator cover (189) to transmit power. A water-cooled internal combustion engine of a saddle-ride type vehicle in which the internal combustion engine (71) is swingably supported by a vehicle body frame (11) together with a device (72) and a rear wheel (23) receiving power from the power transmission device (72) In the institution
The cooling fan (83) is electrically operated, and the center of the cooling fan (83), the radiator (81), and the radiator cover (189) in the vertical direction is the axis (114a) of the crankshaft (114). A water-cooled internal combustion engine of a saddle-ride type vehicle, which is disposed so as to be offset upward from the upper side of the vehicle.   The cooling fan (83) is spaced apart from the crankshaft (114) and close to the inner surface of the radiator (81). The cooling fan (83), the radiator (81), and the The water-cooled internal combustion engine of a saddle-ride type vehicle according to claim 1, wherein the vertical centers of the radiator cover (189) have substantially the same height.   The radiator (81) connects the upper tank (95), the lower tank (96) disposed below the upper tank (95), and the upper tank (95) and the lower tank (96). And the center of the core (97) and the axis (202a) of the rotation shaft (202) of the cooling fan (83) are arranged on the same or substantially the same plane (224). The water-cooled internal combustion engine of a saddle-ride type vehicle according to claim 1 or 2, wherein   The internal combustion engine (71) is an OHC type in which a cylinder portion (75) extends obliquely upward and forward from a crankcase (74), and the power transmission device (72) is connected to the crankshaft (114) from the crankshaft (114). 114) is provided with a continuously variable transmission mechanism (141) for transmitting power via a belt (158) to a driven shaft (154) disposed on the rear side of 114), and the axis (114a) of the crankshaft (114) and the driven shaft A cam shaft provided in the axis (202a) of the rotating shaft (202) of the cooling fan (81) and the internal combustion engine (71) with respect to the first virtual plane (223) passing through the axis (154a) of (154) The water-cooled internal combustion engine of a saddle-ride type vehicle according to any one of claims 1 to 3, wherein the second imaginary plane (224) passing through the axis (88a) of (88) is positioned substantially in parallel. organ.   A water pump (86) is mounted coaxially with the camshaft (88), and an air vent passage (105) provided in a cooling water passage is connected to the upper tank (of the water pump (86) and the radiator (81)). 95), and the radiator (81) is tilted forward so that the rear part is located above the front part. 5. The saddle-ride type vehicle according to claim 4, wherein Water-cooled internal combustion engine.   The radiator (81) is disposed so as to be inclined so that a rear portion thereof protrudes outward in the vehicle width direction from the front portion, and the radiator cover (189) from the outside along the outer surface of the radiator (81). The water-cooled internal combustion engine of a saddle-ride type vehicle according to any one of claims 1 to 5, wherein the engine is covered.   Between the radiator (81) and the crankshaft (114), a space (186) whose rear portion extends in the vehicle width direction is provided rather than the front portion, and the cooling fan (83) is provided in this space (186). The water-cooled internal combustion engine of a saddle-ride type vehicle according to claim 6, wherein the internal combustion engine is accommodated.   The cooling fan (83) includes a fan main body (192) having a plurality of blades arranged close to the inner surface of the radiator (81), and the fan main body (192) is connected to a rotating shaft (202). The drive unit (193) that is rotationally driven, and the drive unit (193) is arranged to be offset backward with respect to the axis (114a) of the crankshaft (114). A water-cooled internal combustion engine for a saddle-ride type vehicle according to claim 1.   A shroud (188) in which an enclosure portion (191c) surrounding the radially outer side of the cooling fan (83) and an exhaust port (221) for exhausting the exhaust air passing through the radiator (81) to the outside are provided. The water-cooled internal combustion engine of a saddle-ride type vehicle according to any one of claims 1 to 8, wherein the cooling fan (83) is attached to the shroud (188).   The scissor according to claim 9, wherein the driving part (193) of the cooling fan (83) is attached to the shroud (188) by a plurality of radially provided stays (194, 195, 196). A water-cooled internal combustion engine for riding vehicles.   The shroud (188) is attached to the radiator (81) so that the radiator (81), the shroud (188), and the cooling fan (83) can be assembled in a small size. Item 11. A water-cooled internal combustion engine of a saddle-ride type vehicle according to Item 9 or 10.   The electric wires (216, 217) connected to the cooling fan (83) are routed from the cooling fan (83) toward the front upper side, according to any one of claims 1 to 11. A water-cooled internal combustion engine for a saddle-ride type vehicle as described.

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