Saddle-type vehicle

Abstract

To provide a saddle riding vehicle capable of more effectively rectifying warm air which has passed through a radiator.SOLUTION: A saddle riding vehicle (1) includes a power unit (P) serving as a drive source, and a radiator (40) that dissipates heat from cooling water of the power unit (P). Herein, the saddle riding vehicle includes an air intake duct (74) that bulges outward to one side of the radiator (40) in a front view of the radiator (40) and has an intake port (74c) formed in a front part. A vent (74d) that communicates with the intake port (74c) on the back side of the radiator (40) and is oriented to the other side of the radiator (40) is formed on a rear part of the air intake duct (74).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a straddle-type vehicle, and more particularly to a straddle-type vehicle equipped with a radiator that dissipates heat from cooling water for a power unit. [Background technology]

[0002] BACKGROUND ART Conventionally, in a vehicle equipped with a radiator that dissipates heat from cooling water of a power unit, a method of arbitrarily rectifying the flow of hot air that has passed through the radiator has been known.

[0003] Patent Document 1 discloses a configuration in which a cover member that covers a cooling fan attached to the back of a radiator is provided at the bottom with a duct that exhausts warm air that has passed through the radiator downward or to the side. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-160605 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when cooling efficiency is improved and the power unit output is increased, it is necessary to direct hotter air, and depending on the amount of exhaust air, the direction may cause discomfort to passengers, so there was still room for improvement in order to achieve more effective airflow regulation.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a straddle-type vehicle that solves the above-mentioned problems of the prior art and can more effectively rectify the flow of warm air that has passed through a radiator. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention has a first feature in that a saddle-type vehicle (1) having a power unit (P) as a drive source and a radiator (40) that dissipates heat from cooling water of the power unit (P), is provided with an intake duct (74) that bulges out on one side of the radiator (40) when viewed from the front of the radiator (40) and has an intake port (74c) formed in the front portion thereof, and an exhaust port (74d) that communicates with the intake port (74c) and is directed to the other side of the radiator (40) is formed in the rear portion of the intake duct (74) on the back side of the radiator (40).

[0008] A second feature of the vehicle is that it includes a side cowl (3) that covers the radiator (40) from the outside in the vehicle width direction, and a radiator shroud (50) that covers at least a part of the radiator (40) in a front view of the vehicle body, and the intake port (74c) is exposed between the side cowl (3) and the radiator shroud (50) in a front view.

[0009] The radiator shroud (50) has a plurality of louvers (54, 55, 56, 57, 58, 59), and an outer louver (54) of the plurality of louvers (54, 55, 56, 57, 58, 59) located outward of the radiator (40) is disposed close to the inner wall of the side cowl (3), and a cutout portion (K) is formed in the outer louver (54) to expose the intake duct (74) forward in a front view of the vehicle body.

[0010] A fourth feature is that the cooling fan (90) is disposed behind the radiator (40), and a cooling fan cover (70) covers the radiator (40) from behind, and the intake duct (74) is provided integrally with the cooling fan cover (70).

[0011] A fifth feature of the intake duct (74) is that it includes a rear wall (74b) extending outward from the rear of the radiator (40), and a front wall (74a) extending forward from the outer edge of the rear wall (74b).

[0012] A sixth feature of the present invention is that a discharge pipe (44) and a suction pipe (42) for the cooling water are provided on the back surface of the radiator (40), and the intake duct (74) is disposed between the discharge pipe (44) and the suction pipe (42) and closer to the suction pipe (42).

[0013] A seventh feature is that the radiator (40) is disposed offset outward in the vehicle width direction from the body center (C) of the saddle-ride type vehicle (1), and the intake duct (74) is disposed outward in the vehicle width direction from the radiator (40).

[0014] An eighth feature is that the intake duct (74) is provided at a position near the upper side of the cooling fan cover (70), and below the intake duct (74) there are provided a cylindrical portion (71) that extends cylindrically rearward and accommodates the cooling fan (90), and exhaust ducts (72, 73) that communicate with the cylindrical portion (71) and guide the warm air blown rearward by the cooling fan (90) into the vehicle body.

[0015] A ninth feature of the exhaust ducts (72, 73) is that they include an upper exhaust duct (72) that bulges rearward at a position overlapping with the cooling fan (90) when viewed from behind the radiator (40) and guides the warm air that has passed through the radiator (40) into the vehicle body, and a lower exhaust duct (73) that is below the upper exhaust duct (72) and guides the warm air that has passed through the radiator (40) into the vehicle body.

[0016] Furthermore, a tenth feature of the present invention is that at least a portion of the upper exhaust duct (72) is located above the upper edge of the power unit (P). [Effects of the Invention]

[0017] According to a first feature, in a saddle-type vehicle (1) having a power unit (P) as a drive source and a radiator (40) that dissipates heat from cooling water of the power unit (P), an intake duct (74) is provided that bulges out on one side of the radiator (40) in a front view of the radiator (40) and has an intake port (74c) formed in a front portion thereof, and an exhaust port (74d) that is connected to the intake port (74c) and directed to the other side of the radiator (40) is formed in the rear portion of the intake duct (74) on the back side of the radiator (40).Therefore, the intake duct takes in low-temperature running air that has not passed through the radiator and discharges it from the exhaust port directed toward the inside of the vehicle body, thereby making it possible to mix the low-temperature running air with the warm air that has passed through the radiator, thereby lowering the temperature of the warm air. In addition, the intake duct creates a flow toward the inside of the vehicle body, which reduces the exposure of exhaust heat to passengers and promotes heat dissipation from inside the vehicle body.

[0018] According to the second feature, the vehicle includes a side cowl (3) that covers the radiator (40) from the outside in the vehicle width direction, and a radiator shroud (50) that covers at least a part of the radiator (40) in a front view of the vehicle body, and the intake port (74c) is exposed in a front view between the side cowl (3) and the radiator shroud (50). Therefore, the side cowl and the radiator shroud receive the traveling wind and guide it to the cutout, thereby making it possible to efficiently guide the traveling wind to the intake port.

[0019] According to a third feature, the radiator shroud (50) includes a plurality of louvers (54, 55, 56, 57, 58, 59), and an outer louver (54) of the plurality of louvers (54, 55, 56, 57, 58, 59) located outward from the radiator (40) is disposed close to an inner wall of the side cowl (3), and a cutout portion (K) that exposes the intake duct (74) forward in a front view of the vehicle body is formed in the outer louver (54). Therefore, the outer louvers of the side cowl and the radiator shroud can efficiently introduce traveling wind into the intake duct.

[0020] According to a fourth feature, the vehicle is provided with a cooling fan (90) disposed behind the radiator (40), a cooling fan cover (70) covering the radiator (40) from behind, and the intake duct (74) is integrally formed with the cooling fan cover (70), so that the airflow introduced by the intake duct can be easily rectified toward the inside of the radiator. Also, an increase in the number of parts can be suppressed.

[0021] According to the fifth feature, the intake duct (74) includes a rear wall (74b) extending outward from the rear of the radiator (40) and a front wall (74a) extending forward from the outer edge of the rear wall (74b). Therefore, the front wall makes it easy to form a concave intake port that efficiently receives airflow from the front due to running, and the rear wall increases the flow velocity of the airflow, thereby facilitating mixing of the airflow with the warm air that has passed through the radiator.

[0022] According to the sixth feature, the cooling water discharge pipe (44) and the intake pipe (42) are provided on the back surface of the radiator (40), and the intake duct (74) is disposed between the discharge pipe (44) and the intake pipe (42) and closer to the intake pipe (42). Therefore, the intake duct is provided at a position close to the intake pipe through which high-temperature cooling water passes. This allows the radiator exhaust heat temperature to be efficiently reduced by mixing the warm air having a relatively high exhaust heat temperature with the running air.

[0023] According to the seventh feature, the radiator (40) is disposed offset from the body center (C) of the saddle-riding vehicle (1) toward the outside in the vehicle width direction, and the intake duct (74) is disposed toward the outside in the vehicle width direction of the radiator (40). This makes it possible for the intake duct to receive low-temperature traveling air that does not pass through the radiator from the outside in the vehicle width direction of the radiator.

[0024] According to the eighth feature, the intake duct (74) is provided at a position near the upper side of the cooling fan cover (70). A cylindrical portion (71) extending rearward in a cylindrical shape and accommodating the cooling fan (90) is provided below the intake duct (74), and exhaust ducts (72, 73) communicating with the cylindrical portion (71) guide the warm air blown rearward by the cooling fan (90) into the interior of the vehicle body. Thus, by guiding the warm air blown by the cooling fan into the interior of the vehicle body through the exhaust duct, it is possible to prevent the warm air from blowing on an occupant of a saddle-ride type vehicle. In addition, at a position near the top of the radiator, the warm air that has passed through the radiator is guided inside the vehicle body while being cooled by the airflow received by the intake duct, and at a position near the bottom of the radiator, the warm air that has passed through the radiator is guided inside the vehicle body, and the warm air blown by the cooling fan, which operates mainly when the saddle-type vehicle is stopped and no airflow is available from the vehicle, is guided inside the vehicle body, thereby preventing the warm air from hitting the occupants.

[0025] According to a ninth feature, the exhaust ducts (72, 73) include an upper exhaust duct (72) that bulges rearward at a position overlapping with the cooling fan (90) in a rear view of the radiator (40) and guides the warm air that has passed through the radiator (40) into the vehicle body, and a lower exhaust duct (73) that is below the upper exhaust duct (72) and guides the warm air that has passed through the radiator (40) into the vehicle body. Therefore, by providing the upper exhaust duct that bulges rearward at a portion that overlaps with the cooling fan in a rear view of the radiator, it is possible to increase the flow velocity of the warm air that has passed through the radiator, thereby improving the air blowing efficiency of the cooling fan. In addition, the lower exhaust duct allows the warm air that has passed through the radiator to be efficiently guided into the vehicle body.

[0026] According to the tenth feature, at least a portion of the upper exhaust duct (72) is located above the upper edge of the power unit (P), and thus the warm air blown rearward by the cooling fan can be guided into the vehicle body above the power unit, thereby smoothly guiding the warm air into the vehicle body. This further prevents the warm air from blowing onto the occupant of the saddle-ride type vehicle. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a right side view of a motorcycle according to one embodiment of the present invention. [Figure 2] FIG. 2 is a partially enlarged right side view of the motorcycle with the side cowl removed. [Figure 3] FIG. 3 is a perspective view of the motorcycle of FIG. 2 as seen from the right rear. [Figure 4] FIG. 2 is a partially enlarged front view of the motorcycle. [Figure 5] FIG. 2 is a partially enlarged front view of the motorcycle with the front wheel steering mechanism removed. [Figure 6] FIG. 2 is a perspective view of the radiator with the cooling fan cover attached, as viewed from the right rear. [Figure 7] FIG. 2 is a front view of the radiator with the cooling fan cover attached. [Figure 8] FIG. 2 is a rear view of the radiator with the cooling fan cover attached. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] FIG. 6 is a cross-sectional view taken along line XX in FIG. 5. [Figure 11] FIG. 2 is a perspective view showing an opening formed in a side cowl and its surrounding structure. DETAILED DESCRIPTION OF THE INVENTION

[0028] Preferred embodiments of the present invention will now be described in detail with reference to the drawings. Fig. 1 is a right side view of a motorcycle 1 according to one embodiment of the present invention. The motorcycle 1 is a saddle-ride type vehicle that travels by transmitting driving force from a power unit P, which is an integrated configuration of an internal combustion engine and a transmission, to a rear wheel WR via a drive chain 20. A head pipe F1 that rotatably supports a steering stem (not shown) is provided at the front end of a pair of left and right main frames F2 that constitute the body frame F. A top bridge 8 and a bottom bridge 5 that support a pair of left and right front forks 2 are fixed to the upper and lower ends, respectively, of the steering stem.

[0029] A front wheel WF is rotatably supported at the lower end of the front fork 2. A front fender 4 that covers the upper part of the front wheel WF is attached to the bottom bridge 5. Steering handlebars 10 that support a pair of left and right rearview mirrors 9 are fixed to the upper part of the top bridge 8. A front cowl 7 that supports a headlight 6 is disposed in front of the head pipe F1.

[0030] A fuel tank 11, which is a vehicle body component, is disposed above the power unit P and on top of the main frame F2. A gap is provided between the top of the power unit P and the fuel tank 11. A seat 12 is disposed behind the fuel tank 11. The left and right sides of the fuel tank 11 are covered by a pair of left and right side cowls 3 that cover the main frame F2, hanger frame F3, and part of the power unit P. The side cowls 3 have an opening 3a that is substantially triangular in a side view of the vehicle body. A rear cowl 13 is disposed behind the side cowls 3.

[0031] A pair of left and right pivot frames F5 supporting a pivot 21 that pivotally supports the swing arm 18 in a freely swingable manner are connected to the lower rear end of the main frame F2, which extends rearward and downward from the head pipe F1. A pair of left and right under frames F4 are connected to the lower end of a hanger frame F3 in the center of the vehicle width direction that extends downward from the head pipe F1, and the rear end of the under frame F4 is connected to the pivot frame F5. The power unit P is disposed in a space surrounded by the main frame F2, hanger frame F3, under frame F4, and pivot frame F5. A pair of left and right step bars 22 on which the driver places his feet are attached to the pivot frame F5. A brake pedal 23 is pivotally supported in a freely swingable manner by the pivot frame F5 on the right side in the vehicle width direction.

[0032] An exhaust system 19 having an exhaust pipe 24 and a muffler 17 is attached to the power unit P. A swing arm 18, which rotatably supports the rear wheel WR, is suspended from the main frame F2 at a position near the front of the swing arm 18 by a rear cushion 14. A pair of left and right upper and lower seat frames F6 and F7 are attached to the rear of the main frame F2. The rear end of the lower seat frame F7 is connected to the underside of the upper seat frame F6. A taillight unit 15 and a rear fender 16 are attached to the rear of the rear cowl 13.

[0033] Fig. 2 is a partially enlarged right side view of the motorcycle 1 with the side cowl 3 removed. Fig. 3 is a perspective view of the motorcycle 1 of Fig. 2 as seen from the right rear. The same reference numerals as those used above indicate the same or equivalent parts. A throttle body 28 is disposed behind a cylinder head 27 of the power unit P, and a cylinder head cover 26 is attached to the top of the cylinder head 27. A radiator 40 that dissipates heat from the cooling water of the power unit P is attached to the right side of the hanger frame F3 in the vehicle width direction. The power unit P may be a drive source including a motor and a battery, and even in this case, a gap is provided between the top of the power unit P and the body part 11.

[0034] A radiator cap 41 is attached to the top of the downflow radiator 40. An intake hose 25 that draws high-temperature cooling water that has cooled the power unit P into the radiator 40 is connected to a position near the top of the radiator 40, and a discharge hose 29 that returns the cooling water that has dissipated heat in the radiator 40 to the power unit P is connected to a position near the bottom of the radiator 40. A radiator shroud 50 having a plurality of louvers is attached to the front of the radiator 40, and a cooling fan cover 70 that covers the electric cooling fan is attached to the rear of the radiator 40.

[0035] The cooling fan cover 70 is provided with an intake duct 74 that bulges out to the right of the radiator 40 in the vehicle width direction. The intake duct 74 has the function of receiving low-temperature traveling air that does not pass through the radiator 40 and guiding it inward in the vehicle width direction. The cooling fan cover 70 also has a cylindrical portion 71 that extends cylindrically toward the rear and houses the cooling fan, and an upper exhaust duct 72 and a lower exhaust duct 73 that are connected to the cylindrical portion 71 and open in the vehicle width direction. The upper exhaust duct 72 and the lower exhaust duct 73 have the function of guiding the warm air blown by the cooling fan inward in the vehicle width direction. Three slits 51 are formed in a position near the top of the radiator shroud 50.

[0036] FIG. 4 is a partially enlarged front view of the motorcycle 1. FIG. 5 is a partially enlarged front view of the motorcycle 1 with the steering mechanism for the front wheel WF removed. The same reference numerals as those used above indicate the same or equivalent parts. The radiator 40 is supported on the right side of the hanger frame F3 in the vehicle width direction by two fastening members 30. The lower end of the radiator 40 is located higher than the underframe F4. The intake duct 74, which bulges out to the right in the vehicle width direction at a position above the cooling fan cover 70 attached to the rear side of the radiator 40, is exposed forward in a front view of the vehicle body. The radiator 40 is offset to the right in the vehicle width direction from the center C of the motorcycle 1, and the intake duct 74 is located to the right of the radiator 40 in the vehicle width direction. This allows the intake duct 54 to receive low-temperature airflow from the right side of the radiator 40 in the vehicle width direction that does not pass through the radiator 40. More specifically, when viewed from the front of the radiator 40, the radiator 40 bulges out to one side and has an intake port at the front. 7 The intake duct 74 has an intake port 4c formed therein, and the intake port 4c is formed at the rear of the intake duct 74 on the rear side of the radiator 40. 74c and An exhaust port 74d is formed that is connected to the other side of the radiator 40, so that the intake duct takes in low-temperature running air that has not passed through the radiator and discharges it from the exhaust port directed toward the inside of the vehicle body, making it possible to mix the low-temperature running air with the warm air that has passed through the radiator and lower the temperature of the warm air.

[0037] The radiator shroud 50 is provided with a plurality of louvers 54, 55, 56, 57, 58, and 59 oriented in the vertical direction. The louvers 54, 55, 56, 57, 58, and 59 are inclined so that the front side is located to the right of the rear side in the vehicle width direction and are arranged so that they overlap each other when viewed from the front of the vehicle. Therefore, the core portion of the radiator 40 is hidden by the louvers 54, 55, 56, 57, 58, and 59 when viewed from the front of the vehicle. This protects the core portion from flying stones and the like while the vehicle is in motion. The intake duct 74 is exposed forward from a notch K formed in the outer louver 54, which is located at the right end of the vehicle width direction and to the right of the radiator 40 in the vehicle width direction.

[0038] The outer louvers 54 are disposed close to the inner wall of the side cowl 3, and the cutout portions K are formed in the outer louvers 54, so that the side cowl 3 and the outer louvers 54 can efficiently introduce the traveling wind into the intake duct. In this embodiment, the cutout portions K extend long below the intake duct 74, and can guide the traveling wind from the right side of the radiator 40 toward the rear.

[0039] FIG. 6 is a perspective view of the radiator 40 with the cooling fan cover 70 attached, as seen from the right rear. FIG. 7 is a front view of the radiator 40 with the cooling fan cover 70 attached, FIG. 8 is a rear view of the radiator 40 with the cooling fan cover 70 attached, and FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. The same reference numerals as those used above indicate the same or equivalent parts. The intake duct 74 is composed of a front wall 74a that is inclined forward and defines an intake port 74c, and a rear wall 74b that extends inward in the vehicle width direction from the rear end of the front wall 74a. This rear wall 74b defines an exhaust port 74d that is directed to the left in the vehicle width direction. In this embodiment, the front wall 74a is inclined forward to efficiently take in wind generated by running the vehicle. The intake port 74c is located at the outer edge of the radiator 40, and the exhaust port 74d opens toward the side opposite the side where the intake port 74c is located. In this embodiment, the intake duct 74 is provided on the right side of the center CR of the radiator 70 (line IX-IX) in the vehicle width direction.

[0040] In this embodiment, the radiator 40 is provided with an intake duct 74 that bulges outward from the radiator 40 when viewed from the front and has an intake port 74c formed in its front portion, and an exhaust port 74d that is connected to the intake port 74c and directed toward the inside of the vehicle body is formed at the rear of the intake duct 74, on the back side of the radiator 40. This allows the intake duct 74 to take in low-temperature running air that has not passed through the radiator 40 and discharge it from the exhaust port 74d directed toward the inside of the vehicle body, thereby making it possible to mix the low-temperature running air with the warm air that has passed through the radiator 40 and lower the temperature of the warm air. Furthermore, the intake duct 74 creates a flow toward the inside of the vehicle body, which promotes heat dissipation from inside the vehicle body.

[0041] In this embodiment, the vehicle has side walls 74e that extend forward from the edges of the front wall 74a and rear wall 74b until they are close to the back of the radiator 40, and has a U-shaped cross section with an open end at the front. This makes it easy to form a concave intake port 74c that efficiently receives the wind from the front via the front wall 74a, and the rear wall 74b can increase the flow rate of the wind and promote mixing with the warm air that has passed through the radiator 40.

[0042] If an intake duct such as that of this embodiment were to be configured using an exterior part such as a side cowl, it would be necessary to guide the air in a visible position on the side of the vehicle body, which would change the air guidance characteristics and appearance, thereby reducing design freedom. Furthermore, if an intake duct were to be configured using an inner cowl, the number of parts and weight would increase. However, in this embodiment, by configuring the duct integrally with the cooling fan cover 70, it becomes easy to rectify the airflow introduced by the intake duct 74 toward the inside of the radiator 40, and an increase in the number of parts can also be suppressed.

[0043] Furthermore, intake duct 74 is provided at a position near the top of cooling fan cover 70, and below intake duct 74 are provided a cylindrical portion 71 that extends rearward and houses a cooling fan 90 driven by a motor 91, as well as an upper exhaust duct 72 and a lower exhaust duct 73 that communicate with cylindrical portion 71 and guide warm air blown rearward by cooling fan 90 into the interior of the vehicle body. Upper exhaust duct 72 bulges rearward at a position that overlaps with cooling fan 90 in a rear view of radiator 40, and has the function of guiding warm air that has passed through radiator 40 into the interior of the vehicle body. Lower exhaust duct 73 is below upper exhaust duct 72 and has the function of guiding warm air that has passed through radiator 40 into the interior of the vehicle body.

[0044] As a result, by guiding the warm air blown by cooling fan 90 to the inside of the vehicle body through exhaust ducts 72, 73, it is possible to prevent the warm air from blowing onto the rider of motorcycle 1. In addition, it is possible to increase the flow rate of the warm air that has passed through radiator 40, thereby improving the air blowing efficiency of cooling fan 90.

[0045] Furthermore, at a position near the top of radiator 40, the warm air that has passed through radiator 40 is guided into the interior of the vehicle body while being cooled by the airflow received by intake duct 74, and at a position near the bottom of radiator 40, the warm air that has passed through radiator 40 is guided into the interior of the vehicle body, thereby preventing the warm air from blowing against the rider by guiding the warm air blown by the cooling fan, which operates mainly when motorcycle 1 is stopped and no airflow is available from traveling. Upper exhaust duct 72 and lower exhaust duct 73 extend in the vertical direction from below the rotation axis of cooling fan 90 to near the lower end of radiator 40, and are shaped to bulge inward and rearward from the right end of radiator 40.

[0046] 2 and 3, a portion of the upper exhaust duct 72 is located above the upper edge of the cylinder head cover 26. This allows the warm air blown rearward by the cooling fan 90 to be guided into the vehicle body above the cylinder head cover 26, making it possible to smoothly guide the warm air into the vehicle body. The reason why the upper exhaust duct 72 bulges rearward more than the lower exhaust duct 73 is to smoothly guide the warm air into the vehicle body, targeting the gap above the cylinder head cover 29, without reducing the flow rate of the warm air. This is also true when the power unit is a drive source including a battery and a motor, and is set so that the power unit P does not interfere with the exhaust of the warm air even when the radiator 40 and the power unit P overlap in the vertical direction.

[0047] Furthermore, a coolant discharge pipe 44 and a coolant intake pipe 42 are provided on the back of the radiator 40, and the intake duct 74 is disposed between the discharge pipe 44 and the intake pipe 42, near the intake pipe 42. By providing the intake duct 74 in a position close to the intake pipe 42 through which high-temperature coolant passes, the warm air, which has a relatively high exhaust heat temperature from the radiator 40, can be mixed with the running air, thereby reducing the temperature behind the radiator 40.

[0048] Upper exhaust duct 72 has an inclined shape so that the distance between it and radiator core 43 increases from the right end toward the inside of the vehicle body. As a result, the edge of lower exhaust duct 73 inside the vehicle body forms exhaust port 73a between it and radiator core 43. Exhaust port 73a has an inclined shape so that the distance between it and radiator core 43 increases from its lower end toward the top, and is connected to upper exhaust duct 72. As a result, warm air rising from a position near the bottom of radiator 40 can be blown by cooling fan 90 and guided toward the inside of the vehicle body.

[0049] Among the multiple openings provided on the side surface of the cylindrical portion 71 of the fan cover 70, three through holes H2 located at the lower right in a rear view of the radiator 40 are formed to have larger opening areas than the other through holes H1 provided above these three through holes H2. These three through holes H2 are disposed in positions that overlap with openings 3a (see FIG. 11) provided in the side cowl 3 in a side view of the vehicle body. On the left side of the cylindrical portion 71, multiple through holes H2 with larger opening areas than the through holes H1 are provided. The multiple horizontally elongated through holes provided on the rear portion of the cylindrical portion 71 are set to have slightly smaller opening areas than usual. This makes it easier to guide warm air to the upper exhaust duct 72 and the lower exhaust duct 73 when the cooling fan 90 is rotating.

[0050] 10 is a cross-sectional view taken along line XX in FIG. 5. The front ends of the side cowls 3 are located forward of the front ends of the radiator shrouds 50, and the rear portions of the side cowls 3 extend rearward of the radiator 40. The rear portions of the side cowls 3 are inclined inward in the vehicle width direction, and are configured so that exhaust air is guided toward the vehicle width inward using the inner surface of the cowl behind the radiator 40. The front surface of the front wall 74a of the intake duct 74 formed in the cooling fan cover 70 is flush with the front surface of the radiator 40. The exhaust port 74d formed by the rear wall 74b is disposed rearward of the rear surface of the radiator 40. The traveling wind W is efficiently introduced into the intake duct 74 through the notches K formed in the outer louvers 54. The shape and size of the intake duct 74 can be modified in various ways. For example, the intake duct 74 may have a shape that curves gently from the front wall 74a to the rear wall 74b. The intake duct may also be formed by only the front wall or only the rear wall.

[0051] FIG. 11 is a perspective view showing the opening 3a formed in the side cowl 3 and its surrounding structure. The same reference numerals as those used above indicate the same or equivalent parts. While the motorcycle 1 is traveling, the traveling air W introduced from the front of the radiator shroud 50 is divided into exhaust air W1, which passes through the intake duct 74 and is guided from behind the radiator 40 to the interior of the vehicle body, and exhaust air W2, which passes through the radiator 40 and is blown by the cooling fan 90. As shown in FIG. 8 , three larger through-holes H2 are formed on the outer periphery of the cylindrical portion 71 of the cooling fan cover 70, and are positioned corresponding to the opening 3a of the side cowl 3. This is because the exhaust air W3 from the opening 3a is expected to be cooled by mixing with the traveling air W passing outside the side cowl 3 in the vehicle width direction. This makes it possible to increase the amount of exhaust air W3 from the opening 3a while minimizing the thermal impact on the rider.

[0052] As described above, motorcycle 1 according to the present invention is provided with intake duct 74 that bulges outward from radiator 40 when viewed from the front and has intake port 74c formed in its front portion, and exhaust port 74d that is connected to intake port 74c on the back side of radiator 40 and directed toward the interior of the vehicle body is formed in the rear portion of intake duct 74. Therefore, intake duct 74 takes in low-temperature traveling air W that has not passed through radiator 40 and discharges it from exhaust port 74d directed toward the interior of the vehicle body, thereby making it possible to mix the low-temperature traveling air W with the warm air that has passed through radiator 40 and lower the temperature of the warm air. Furthermore, intake duct 74 creates a flow directed toward the interior of the vehicle body, which promotes heat dissipation from inside the vehicle body.

[0053] The configuration of the motorcycle, the shape and structure of the side cowls, the shape and structure of the radiator, the shape and structure of the cooling fan cover and radiator shroud, the shape of the intake duct and exhaust duct, the shape of the cutouts, and the like are not limited to those described in the above-described embodiment and can be modified in various ways. For example, the side cowls may be shaped to cover only the sides of the radiator. Furthermore, the intake ducts may be provided above or below the radiator in addition to on the left and right sides in the vehicle width direction. Furthermore, the radiator may be offset to the left in the vehicle width direction, or may be a horizontally elongated cross-flow type that exceeds the width of the front forks in a front view of the vehicle body. The radiator cooling structure according to the present invention is not limited to motorcycles, but may also be applied to various vehicles, such as three-wheeled vehicles and four-wheeled vehicles, that are driven by a power unit including an internal combustion engine. [Explanation of symbols]

[0054] 1...motorcycle (saddle-ride type vehicle), 3...side cowl, 40...radiator, 44...discharge pipe, 42...suction pipe, 50...radiator shroud, 54, 55, 56, 57, 58, 59...louvers, 54...outer louvers (louvers), 70...cooling fan cover, 74...intake duct, 74b...rear wall, 74c...intake port, 74d...exhaust port, 71...cylindrical portion, 72...upper exhaust duct (exhaust duct), 73...lower exhaust duct (exhaust duct), 74a...front wall, 90...cooling fan, C...center of motorcycle body, K...notch, P...power unit

Claims

1. A saddle-type vehicle (1) having a power unit (P) as a drive source and a radiator (40) for radiating heat from cooling water of the power unit (P), an intake duct (74) that bulges out to one side of the radiator (40) when viewed from the front of the radiator (40) and has an intake port (74c) formed in the front part; an exhaust port (74d) communicating with the intake port (74c) and directed to the other side of the radiator (40) is formed at the rear of the intake duct (74), on the rear side of the radiator (40); a side cowl (3) that covers the radiator (40) from the outside in the vehicle width direction; a radiator shroud (50) that covers at least a portion of the radiator (40) when viewed from the front of the vehicle body; the intake port (74c) is exposed between the side cowl (3) and the radiator shroud (50) in a front view, The radiator shroud (50) includes a plurality of louvers (54, 55, 56, 57, 58, 59), an outer louver (54) located outside the radiator (40) among the plurality of louvers (54, 55, 56, 57, 58, 59) is disposed in proximity to an inner wall of the side cowl (3); A saddle-type vehicle characterized in that the outer louver (54) is formed with a notch (K) that exposes the intake duct (74) forward when viewed from the front of the vehicle body.

2. a cooling fan (90) disposed behind the radiator (40); a cooling fan cover (70) that covers the radiator (40) from the rear, 2. The straddle-type vehicle according to claim 1, wherein the intake duct (74) is provided integrally with the cooling fan cover (70).

3. 3. The saddle-type vehicle according to claim 1, wherein the intake duct (74) comprises a rear wall (74b) extending outward from behind the radiator (40), and a front wall (74a) extending forward from an outer edge of the rear wall (74b).

4. A discharge pipe (44) and a suction pipe (42) for the cooling water are provided on the back surface of the radiator (40), 3. The straddle-type vehicle according to claim 1, wherein the intake duct (74) is disposed between the discharge pipe (44) and the intake pipe (42) and closer to the intake pipe (42).

5. The radiator (40) is disposed offset outward in the vehicle width direction from the vehicle body center (C) of the saddle-ride type vehicle (1), 3. The straddle-type vehicle according to claim 1, wherein the intake duct (74) is disposed on the outer side of the radiator (40) in the vehicle width direction.

6. The intake duct (74) is provided at a position near the upper side of the cooling fan cover (70), 3. The straddle-type vehicle according to claim 2, further comprising: a cylindrical portion (71) extending cylindrically rearward below the intake duct (74) and accommodating the cooling fan (90); and exhaust ducts (72, 73) communicating with the cylindrical portion (71) and guiding the warm air blown rearward by the cooling fan (90) into the interior of the vehicle body.

7. 7. The straddle-type vehicle according to claim 6, wherein the exhaust ducts (72, 73) comprise an upper exhaust duct (72) that bulges rearward at a position overlapping with the cooling fan (90) when viewed from behind the radiator (40) and guides the warm air that has passed through the radiator (40) into the vehicle body, and a lower exhaust duct (73) that is below the upper exhaust duct (72) and guides the warm air that has passed through the radiator (40) into the vehicle body.

8. 8. The straddle-type vehicle according to claim 7, wherein at least a portion of the upper exhaust duct (72) is located above an upper edge of the power unit (P).

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