WO2021199704A1

WO2021199704A1 - Saddle-type vehicle

Info

Publication number: WO2021199704A1
Application number: PCT/JP2021/005039
Authority: WO
Inventors: 宗一朗宮本; 大石　健一; 龍一中西
Original assignee: 本田技研工業株式会社
Priority date: 2020-03-30
Filing date: 2021-02-10
Publication date: 2021-10-07
Also published as: JPWO2021199704A1; JP7406624B2

Abstract

Provided is a saddle-type vehicle that can effectively guide exhaust from a radiator to rearward of the radiator.　A motorcycle 10 comprises a pair of left and right down frames 19A that extend downward from a head pipe 18, and a radiator 66 that is disposed in a front part of the vehicle, wherein, in a side view of the vehicle, the top edge of the radiator 66 is disposed rearward of the down frames 19A and the bottom edge of the radiator 66 is disposed forward of the down frames 19A or in a position overlapping the down frames 19A.

Description

Saddle-riding vehicle

The present invention relates to a saddle-riding vehicle.

Conventionally, a saddle-riding vehicle in which a radiator is arranged immediately after the front wheels and is tilted forward is known (see, for example, Patent Document 1).
In order to improve the cooling efficiency, the radiator is preferably arranged at an optimum place and angle according to the design of the vehicle body and the flow of the running wind, and depending on the vehicle, it may be desired to tilt it backward.

Japanese Unexamined Patent Publication No. 2006-256615

However, when placed immediately after the front wheels, the space between the front wheels and the down frame is limited, and especially in the case of a scooter type saddle-type vehicle, a floor step is provided behind the down frame, so the down frame The space behind the radiator is also limited, it is more difficult to incline it greatly, and it is difficult for the exhaust air from the radiator to flow to the rear of the radiator. This problem is more pronounced in vehicles with larger radiator sizes.
An object of the present invention is to provide a saddle-riding vehicle capable of effectively flowing the exhaust air of the radiator to the rear of the radiator.

This specification includes all the contents of the Japanese patent application and Japanese Patent Application No. 2020-60602 filed on March 30, 2020.
The saddle-riding vehicle is a saddle-riding vehicle having a pair of left and right down frames (19A) extending downward from the head pipe (18) and a radiator (66) arranged at the front of the vehicle. The upper end of the radiator (66) is arranged behind the down frame (19A), and the lower end of the radiator (66) is located at a position overlapping the down frame (19A) or in front of the down frame (19A). It is characterized by being arranged.

In the above configuration, the lower first cross frame (81) connecting the lower parts of the left and right down frames (19A) is provided, and the lower first cross frame (81) is from the lower part to the lower front part of the down frame (19A). It has a pair of left and right end portions (81b) extending to the left and right ends (81b) and a center portion (81a) located between the left and right end portions (81b), and the upper end of the radiator (66) is of the down frame (19A). It is supported on the rear side, and the lower end of the radiator (66) may be supported by the center portion (81a).
Further, in the above configuration, the lower end of the radiator (66) may be fixed to a bracket (19e) protruding forward from the center portion (81a).

Further, in the above configuration, a lower frame (19B) extending rearward from the lower ends of the left and right down frames (19A) and a center frame (19B) extending downward from the head pipe (18) and arranged in the center in the vehicle width direction. 20), a lower second cross frame (94) extending from the lower end of the center frame (20) to the left and right lower frames (19B), and the lower extending rearward from the lower part of the left and right down frames (19A). A floor frame (22) located above the frame (19B) is provided, and the lower second cross frame (94) is curved so as to be convex upward when viewed from the front of the vehicle, and the uppermost portion (94a) is formed. An exhaust passage (120) that overlaps with the floor frame (22) when viewed from the side of the vehicle and through which the exhaust air of the radiator (66) passes may be provided below the lower second cross frame (94).

Further, in the above configuration, the lower first cross frame (81) for connecting the lower parts of the left and right down frames (19A) and the undercover (61) for protecting the lower part of the vehicle body are provided, and the undercover (61) is provided. It may be fixed to the lower first cross frame (81) from below.
Further, in the above configuration, the undercover (61) includes an engaging portion (61a) projecting upward, and the engaging portion (61a) is engaged with the lower first cross frame (81) from below. May be fixed.

In a saddle-riding vehicle, the upper end of the radiator is placed behind the down frame and the lower end of the radiator is placed at a position overlapping the down frame or in front of the down frame in the vehicle side view, so that the radiator is made larger. You can lean backwards. As a result, the exhaust air of the radiator can be effectively flowed to the lower part of the vehicle body, and the cooling efficiency of the radiator can be improved.

In the above configuration, the lower first cross frame for connecting the lower parts of the left and right down frames is provided, and the lower first cross frame is between a pair of left and right ends extending from the lower part of the down frame to the front and lower parts and the left and right ends. Since it has a center portion to be located, the upper end of the radiator is supported by the rear side of the down frame, and the lower end of the radiator is supported by the center portion, a large space for arranging the radiator can be secured. The radiator can be tilted backwards and placed.
Further, in the above configuration, since the lower end of the radiator is fixed to the bracket protruding forward from the center portion, the radiator support structure can be simplified, and the man-hours and cost for assembling the motorcycle can be reduced.

Further, in the above configuration, the lower frame extending rearward from the lower ends of the left and right down frames, the center frame extending downward from the head pipe and arranged in the center in the vehicle width direction, and the lower frames of the center frame to the left and right lower frames. It includes a lower second cross frame that extends and a floor frame that extends rearward from the lower part of the left and right down frames and is located above the lower frame, so that the lower second cross frame is convex upward when viewed from the front of the vehicle. The uppermost part overlaps the floor frame when viewed from the side of the vehicle, and an exhaust passage through which the exhaust air from the radiator passes is provided below the lower second cross frame. By overlapping the uppermost part with the floor frame, the exhaust air passage can be formed high, the cross-sectional area of the exhaust air passage can be made larger, and the exhaust air of the radiator can easily flow, so that the cooling efficiency of the radiator can be improved.

Further, in the above configuration, a lower first cross frame for connecting the lower parts of the left and right down frames and an undercover for protecting the lower part of the vehicle body are provided, and the undercover is fixed to the lower first cross frame from below. 1 The lower end of the radiator can be arranged further forward by utilizing the space above the cross frame, and the radiator can be tilted more backward. As a result, the cooling efficiency of the radiator can be further improved.
Further, in the above configuration, the undercover includes an engaging portion that projects upward, and the engaging portion is engaged and fixed to the lower first cross frame from below, so that the undercover is attached to the lower first cross frame. Easy to assemble.

FIG. 1 is a left side view showing a motorcycle according to an embodiment of the present invention. FIG. 2 is a left side view showing a body frame of a motorcycle. FIG. 3 is a perspective view of the vehicle body frame and its surroundings as viewed diagonally from the front. FIG. 4 is a left side view showing the vehicle body frame and its surroundings. FIG. 5 is a perspective view of the vehicle body frame and its surroundings as viewed diagonally from the rear. FIG. 6 is a perspective view showing an undercover. FIG. 7 is a plan view showing the undercover. FIG. 8 is a cross-sectional view of the center of the motorcycle in the width direction cut vertically in the front-rear direction. FIG. 9 is a cross-sectional view of the lower portion of the front portion of the vehicle body cut vertically in the front-rear direction through the front engaging portion of the undercover. FIG. 10 is a perspective view showing a radiator and a reservoir tank.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the explanation, the directions such as front / rear / left / right and up / down are the same as the directions with respect to the vehicle body unless otherwise specified. Further, the reference numerals FR shown in each figure indicate the front of the vehicle body, the reference numerals UP indicate the upper part of the vehicle body, and the reference numerals LH indicate the left side of the vehicle body.
FIG. 1 is a left side view showing a motorcycle 10 according to an embodiment of the present invention, and FIG. 2 is a left side view showing a body frame 11 of the motorcycle 10.
As shown in FIGS. 1 and 2, in the motorcycle 10, the front wheels 13 are supported by the front end of the body frame 11 via the front fork 12, and the rear wheels 15 are supported by the rear wheels 15 via the power unit 14 below the body frame 11. It is a saddle-riding type vehicle.
The motorcycle 10 is a saddle-riding vehicle that rides on a seat 16 arranged above the body frame 11.

The vehicle body frame 11 includes a head pipe 18, a pair of left and right down frames 19A, a pair of left and right lower frames 19B, a center frame 20, a pair of left and right rear frames 21, and a pair of left and right floor frames 22.
The head pipe 18 constitutes the front end portion of the vehicle body frame 11 and is tilted backward when viewed from the side of the vehicle. The left and right down frames 19A extend diagonally downward from the left and right of the lower portion of the head pipe 18.

The left and right lower frames 19B integrally extend rearward from the rear ends of the bent portions 19C provided at the lower ends of the left and right down frames 19A. The center frame 20 extends diagonally downward and rearward from the upper part of the head pipe 18. The left and right rear frames 21 extend diagonally upward and rearward from the rear portions of the left and right lower frames 19B, respectively. The left and right floor frames 22 are located above the left and right lower frames 19B when viewed from the side of the vehicle, and the left and right down frames 19A and the left and right rear frames 21 are connected to the front and rear, and the floor steps described in detail later. Supports 56.

The front fork 12 is rotatably supported by the head pipe 18, the handle 31 is attached to the upper end portion, and the front wheel 13 is supported by the lower end portion via the axle 32. The front wheel 13 is covered with a front fender 33 attached to the front fork 12 from above.
The body cover 46 covering the body frame 11 includes a front cover 51, a pair of left and right front lower covers 52, a front inner cover 53, a leg shield 54, a floor step 56, a pair of left and right floor side skirts 57, a center cover 58, and a pair of left and right bodies. A side cover 59, a handle cover 60, and an under cover 61 are provided.

The floor step 56 extends downward and backward from the lower end of the leg shield 54 and is used as a footrest for the driver. The left and right floor side skirts 57 extend downward from the left and right edges of the floor step 56.

The center cover 58 extends from the rear end of the floor step 56 to below the front end of the seat 16.
The left and right body side covers 59 extend below the side edges of the seat 16 from the floor step 56 and the center cover 58 to the rear of the vehicle body. The handle cover 60 covers the central portion of the handle 31.
The undercover 61 is arranged between the lower edges of the left and right floor side skirts 57, and covers the lower portion of the vehicle body from below.
A radiator 66 is arranged between the left and right down frames 19A.

FIG. 3 is a perspective view of the vehicle body frame 11 and its surroundings viewed diagonally from the front, FIG. 4 is a left side view showing the vehicle body frame 11 and its surroundings, and FIG. It is a perspective view.
As shown in FIGS. 3 to 5, the left and right down frames 19A each have a bent portion 19C that bends backward at the lower end portion, and a lower front portion as a lower first cross frame is provided between the left and right bent portions 19C. The cross frame 81 has been passed.
The lower front cross frame 81 integrally includes a center portion 81a extending in the vehicle width direction and end bending portions 81b as left and right ends bent upward from both ends of the center portion 81a, and the left and right end bending The upper ends of the portions 81b are connected to the lower surfaces of the left and right bent portions 19C, respectively.

Between the left and right down frames 19A, above the lower front cross frame 81, a vertically long radiator 66 is arranged so as to tilt backward with respect to the vertical direction when viewed from the side of the vehicle.
The radiator 66 includes an upper tank 66a and a lower tank 66b in which cooling water for cooling the engine 35 (see FIG. 1) is stored, and a core 66c arranged between the upper tank 66a and the lower tank 66b, respectively. The upper tank 66a is arranged at the upper end of the radiator 66, and the lower tank 66b is arranged at the lower end of the radiator 66.

The upper tank 66a and the lower tank 66b are each connected to the engine 35 via a radiator hose 82. The core 66c is passed between a plurality of cooling water communication pipes for communicating cooling water between the upper tank 66a and the lower tank 66b and adjacent cooling water communication pipes to promote heat dissipation from each cooling water communication pipe. It is provided with fins 66f (see FIG. 8). The fins 66f are attached so as to meander between adjacent cooling water communication pipes.

A mounted portion 66d is provided on the side of the core 66c, and the left and right mounted portions 66d are fixed to the upper radiator mounting brackets 19d provided on the left and right down frames 19A with bolts 83. Further, the lower tank 66b is provided with a convex portion that protrudes downward at the center of the lower surface thereof in the vehicle width direction. This convex portion is inserted and supported in a concave portion provided in the lower radiator mounting bracket 19e as a bracket protruding forward from the front surface of the lower front cross frame 81.
Further, the radiator 66 includes a cap 85 that closes the water injection port 66e formed on the upper surface of the upper tank 66a. The water injection port 66e is connected to the reservoir tank 88 via a hose 87. The reservoir tank 88 is arranged on the side of one of the left and right lower frames 19B.

The upper tank 66a is arranged behind the down frame 19A. The lower tank 66b is arranged above the lower front cross frame 81, specifically, the center portion 81a, and is arranged in front of and below the bent portion 19C when viewed from the side of the vehicle. That is, they are arranged in front of and below the bent portion 19C when viewed from the side of the vehicle. The lower tank 66b is arranged in front of and below the down frame 19A. Further, the lower tank 66b is arranged in front of the lower frame 19B.
As a result, when viewed from the side of the vehicle, the radiator center line 90 passing through the center of the thickness of the radiator 66 in the front-rear direction is tilted backward by an angle θ with respect to the vertically extending vertical straight line 91.
The lower tank 66b may be arranged so as to overlap the down frame 19A when viewed from the side of the vehicle.

Behind the core 66c, an exhaust air regulating member 92 that regulates the direction of the exhaust air discharged from the core 66c is arranged.
The exhaust ventilation member 92 is connected to both ends of the upper plate 92a extending rearward from the upper edge of the core 66c, and a pair of left and right side plates 92b extending rearward from the side edges on both sides of the core 66c. Consists of.
The exhaust air of the core 66c is less likely to spread above and to both sides of the upper edge and both side edges of the core 66c due to the upper plate 92a and the left and right side plates 92b, and easily flows to the rear of the radiator 66.

The undercover 61 has a front engaging portion 61a as a pair of left and right engaging portions that are formed so as to project upward on the upper surface of the front portion and are engaged with the lower front cross frame 81 from below, and both sides of the rear portion. A pair of left and right rear fastening portions 61b, which are formed so as to extend upward at the edge portion and are fastened to the vehicle body frame 11 (specifically, the left and right rear frames 21) from the side with bolts or the like, are provided.

The left and right down frames 19A are connected by an upper cross frame 93 extending in the vehicle width direction.
The left and right lower frames 19B are connected by a lower rear cross frame 94 as a lower second cross frame that bends so as to be convex upward when viewed from the front of the vehicle.
The lower rear cross frame 94 extends in the vehicle width direction, and the lower end portion of the center frame 20 is connected to the uppermost portion 94a of the lower rear cross frame 94 at the center in the vehicle width direction. The radiator 66 is arranged in front of the center frame 20. The upper cross frame 93 and the center frame 20 are connected by a reinforcing member 95 extending in the front-rear direction.

The front end of each of the left and right floor frames 22 is connected to the lower part of the down frame 19A, and the rear end is connected to the lower part of the rear frame 21.

In FIG. 2, the down frame 19A integrally integrates an upper frame portion 19f extending diagonally downward and rearward from the lower part of the head pipe 18 and a lower frame portion 19g extending downward from the lower end of the upper frame portion 19f in a side view. Prepare for. A reinforcing member 101 is attached to the head pipe 18 and the upper portion of the upper frame portion 19f and the lower frame portion 19g.
The lower frame 19B extends diagonally backward and downward from the rear end of the bent portion 19C, and the rear end 19h of the lower frame 19B is open. As a result, rainwater or the like that has entered the down frame 19A and the lower frame 19B can be discharged from the rear end 19h, and it is not necessary to provide a special drain hole in the lower frame 19B.

The front end of the floor frame 22 is connected to the down frame 19A and extends diagonally upward rearward, and the rear end is connected to the lower part of the rear frame 21. The floor frame 22 gradually separates upward from the lower frame 19B from the front end portion to the rear end portion. As a result, the lower portion of the rear frame 21 is supported by a large span between the rear portion of the lower frame 19B and the rear end portion of the floor frame 22, so that the support rigidity for supporting the rear frame 21 can be increased, and the rear can be increased. The frame 21 can be firmly supported. Further, since the intermediate portions of the lower frame 19B and the floor frame 22 in the front-rear direction are connected by the reinforcing member 103, the bending of the rear frame 21 and the floor frame 22 can be suppressed.

FIG. 6 is a perspective view showing the undercover 61, and FIG. 7 is a plan view showing the undercover 61.
As shown in FIGS. 6 and 7, the undercover 61 has a trapezoidal contour whose rear end side is wider in the vehicle width direction than the front end side in a plan view, and has an opening 61c which penetrates vertically in the front portion. The left and right front engaging portions 61a are formed on the front side of the opening 61c.
Further, the undercover 61 includes a front wall 61e extending upward from a flat bottom wall 61d, a pair of left and

right side walls

61f, 61z, and an inclined rear wall 61g as an inclined wall, and these front walls 61e, left and right side walls 61f, The 61z and the inclined rear wall 61g form an opening 61c.

A part of each of the left and right front engaging portions 61a is integrally formed on the front wall 61e. The

side walls

61f and 61z extend above the front wall 61e, one side wall 61f extends straight upward, and the other side wall 61z extends diagonally upward inward in the vehicle width direction from the bottom wall 61d. It is composed of an upper side wall 62b extending upward from the upper end of the inclined side wall 62a. The upper side wall 62b extends above the front wall 61e. The inclined rear wall 61g extends from the bottom wall 61d at the rear end of the opening 61c while being inclined forward.

The bottom wall 61d includes a front bottom wall 61h located in front of the front wall 61e, and has left and right front engaging portions 61a projecting upward on the upper surface of the front bottom wall 61h and projecting upward in the front-rear direction. A plurality of extending ribs 61j are formed. By providing the plurality of ribs 61j, the rigidity of the front bottom wall 61h can be increased, and the left and right front engaging portions 61a can be firmly engaged with the lower front cross frame 81 (see FIG. 3).

Further, the undercover 61 is provided with side walls 61k on the left and right side edges, respectively, and rear fastening portions 61b projecting upward are provided on the left and right side walls 61k.
Further, the front bottom wall 61h is provided with a pair of left and right front cover mounting portions 61m separated from the left and right, and the rear end portions of the left and right side walls 61k are provided with rear cover mounting portions 61n. The left and right front cover mounting portions 61m and the left and right rear cover mounting portions 61n are attached to the lower parts of the left and right floor side skirts 57 (see FIG. 1) with screws (not shown).

FIG. 8 is a cross-sectional view of the motorcycle 10 with the center in the vehicle width direction cut vertically in the front-rear direction.
A louver 111 is arranged in front of the radiator 66. The louver 111 includes a plurality of blade plates 111a arranged vertically separated from each other, and regulates the direction of air flow taken into the radiator 66. Here, the air flow is directed diagonally backward and downward.
A cooling fan 131 (see FIG. 10) for forcibly cooling the radiator 66 is arranged behind the radiator 66. The cooling fan 131 includes a fan motor 114 and a fan main body 115 (see FIG. 10) driven by the fan motor 114.
A battery 116 is arranged below the floor step 56 and above the undercover 61 and behind the lower rear cross frame 94.

Further, an opening 61c of the undercover 61 is arranged behind the radiator 66. The upper end 61p of the front wall 61e of the undercover 61 is located below the lower end 66j of the core 66c of the radiator 66.
The inclined rear wall 61g includes an inclined wall upper portion 61q extending vertically in front of the lower rear cross frame 94, an inclined wall lower portion 61r extending diagonally downward and rearward below the lower rear cross frame 94, and in front of the lower rear cross frame 94. It is composed of an inclined wall bent portion 61s which is bent and connects each of the inclined wall upper portion 61q and the inclined wall lower portion 61r.

The above-mentioned opening 61c and the space 118 surrounded by the front wall 61e, the left and

right side walls

61f, 61z, and the inclined rear wall 61g form an exhaust passage 120 through which the exhaust air of the radiator 66 passes.
The exhaust passage 120 is arranged below the lower rear cross frame 94 and the inclined rear wall 61 g (specifically, the inclined wall lower portion 61r).
The lower rear cross frame 94 is curved so as to be convex upward, and the central portion of the lower rear cross frame 94 (that is, the uppermost portion 94a (see FIG. 5)) is raised to a position where it overlaps the floor frame 22 in the vehicle side view. Has been done. As a result, the upper portion 61q of the inclined wall and the lower portion 61r of the inclined wall of the inclined rear wall 61g can be arranged higher than in the case where the lower rear cross frame 94 is formed in a straight line.

As described above, the front wall 61e is lowered with respect to the core 66c, the left and

right side walls

61f and 61z are extended to the height of the middle portion of the core 66c, and the inclined rear wall 61g is raised to be higher than the middle portion of the core 66c. By extending to the height of, more exhaust air from the radiator 66 can be introduced into the exhaust air passage 120.

As shown by the arrow A, the air taken into the radiator 66 from the front of the radiator 66 via the louver 111 becomes the radiator exhaust air as shown by the arrow B, and the air is exhausted to the rear of the radiator 66. 120 flows diagonally backward and downward along the inclined rear wall 61 g. Then, the air is further discharged from the opening 61c to the outside of the undercover 61 and flows backward below the bottom wall 61d.
In the present embodiment, since the radiator 66 is tilted more backward, the plurality of flat portions 66g provided on the fins 66f provided in the core 66c are tilted backward, so that the exhaust air of the radiator 66 is tilted further backward. It can be tilted downward and flowed. As a result, the exhaust air of the radiator 66 can be directed to the exhaust air passage 120 more smoothly.

FIG. 9 is a cross-sectional view in which the lower part of the front portion of the vehicle body is vertically cut in the front-rear direction through the front engaging portion 61a of the undercover 61.
The front engaging portion 61a of the undercover 61 includes a front engaging portion 61v raised from the front bottom wall 61h in front of the front wall 61e and a rear engaging portion integrally provided on the lower front surface of the front wall 61e. It is composed of 61w. The front engaging portion 61v and the rear engaging portion 61w are provided at a predetermined distance in the front-rear direction.

The front upper end bent portion 61x of the front engaging portion 61v is formed at the upper end portion so as to bend rearward along the outer peripheral surface of the lower front cross frame 81. The rear upper end bending portion 61y of the rear engaging portion 61w is formed at the upper end portion so as to bend forward along the outer peripheral surface of the lower front cross frame 81. The front upper end bent portion 61x and the rear upper end bent portion 61y engage with each other along the outer peripheral surface of the lower front cross frame 81.
When the front engaging portion 61a is engaged with the lower front cross frame 81, the distance C between the front upper end bent portion 61x and the rear upper end bent portion 61y in the front-rear direction is the lower front cross frame made of a round pipe. It is smaller than the outer diameter D of 81.

When engaging the left and right front engaging portions 61a with the lower front cross frame 81, first, the lower portion of the vehicle body frame 11 so that the left and right front engaging portions 61a are located below the lower front cross frame 81. The undercover 61 (the part indicated by the alternate long and short dash line) is arranged in the undercover 61.
Then, as shown by the white arrows, the undercover 61 is moved upward to move the front upper end bent portion 61x of the front engaging portion 61v and the rear upper end bent portion 61y of the rear engaging portion 61w to the lower front cross frame 81. Hit to.

In this state, by further pushing up the undercover 61, the front engaging portion 61v and the rear engaging portion 61w are elastically deformed, and the distance C between the front upper end bending portion 61x and the rear upper end bending portion 61y gradually becomes wider, and the lower The interval C is the widest at the portion where the cross-sectional dimension of the front cross frame 81 in the front-rear direction is the largest.

Further, when the undercover 61 is moved upward, the interval C becomes narrower as the cross-sectional dimension of the lower front cross frame 81 in the front-rear direction gradually decreases, and the front upper end bent portion 61x and the rear upper end bent portion 61y become smaller. Engage with the lower front cross frame 81. At this time, since the lower portion of the lower front cross frame 81 hits the convex portion protruding upward from the front bottom wall 61h or the front bottom wall 61h, the front portion of the undercover 61 rattles with respect to the lower front cross frame 81. It is suppressed.

FIG. 10 is a perspective view showing the radiator 66 and the reservoir tank 88.
The upper tank 66a is provided with a water absorption port 121 for taking in cooling water on one side (left side) of the rear portion, and a water injection port 66e is provided on the other side (right side) of the upper part. The water suction port 121 extends rearward from the upper tank 66a and then bends downward. A radiator hose 82 is connected to a rear end portion that is bent downward of the water suction port 121.
Further, the lower tank 66b is provided so that a discharge port 122 for discharging cooling water projects rearward on one side (left side) of the rear portion. A radiator hose 82 is connected to the rear end of the discharge port 122.

Support plates 126 are attached to the lower side surfaces on both sides of the upper tank 66a and the upper side surfaces on both sides of the lower tank 66b, respectively. The pair of left and right support plates 126 are provided with mounting portions 66d, respectively, and a fan cover 132 that supports the cooling fan 131 is mounted. The fan cover 132 is attached to the support plate 126 on one side (left side) at one location and to the support plate 126 on the other side (right side) at two locations.

The cooling fan 131 includes a fan motor 114 arranged inside the fan cover 132 and supported by the rear portion of the fan cover 132, and a fan main body 115 attached to the rotating shaft of the fan motor 114.
The water injection port 66e is provided with a hose connection port 66h (see FIG. 8), and the hose 87 connected to the hose connection port 66h is connected to the lower part of the reservoir tank 88 through one side (left side) of the radiator 66. Will be done.

As shown in FIGS. 4 and 9, the motorcycle 10 as a saddle-riding vehicle has a pair of left and right down frames 19A extending downward from the head pipe 18 and a radiator 66 arranged at the front of the vehicle. Be prepared.
When viewed from the side of the vehicle, the upper end of the radiator 66 is arranged behind the down frame 19A, and the lower end of the radiator 66 is arranged at a position overlapping the down frame 19A or in front of the down frame 19A (specifically, the bent portion 19C). NS.
According to this configuration, the radiator 66 can be tilted more backward. As a result, the exhaust air of the radiator 66 can be effectively flowed to the lower side of the vehicle body, and the cooling efficiency of the radiator 66 can be improved.

Further, as shown in FIG. 3, the lower front cross frame 81 for connecting the lower portions of the left and right down frames 19A is provided, and the lower front cross frame 81 has left and right ends extending from the lower portion of the down frame 19A to the lower front. It has a portion bent portion 81b and a center portion 81a located between the left and right end bent portions 81b, the upper end of the radiator 66 is fixed to the rear side of the down frame 19A, and the lower end of the radiator 66 is the lower front portion. It is fixed to the center portion 81a of the cross frame 81.
According to this configuration, a large space for arranging the radiator 66 can be secured, so that the radiator 66 can be arranged with the radiator 66 tilted backward.

Further, in the above configuration, as shown in FIGS. 3 and 10, the lower end of the radiator 66 is supported at one place by the lower front cross frame 81.
According to this configuration, the radiator support structure can be simplified, and the man-hours and cost for assembling the motorcycle 10 can be reduced.

Further, as shown in FIGS. 5, 8 and 9, the motorcycle 10 (see FIG. 1) includes a lower frame 19B, a center frame 20, a lower rear cross frame 94, and a floor frame 22.
The lower frame 19B extends rearward from the lower ends of the left and right down frames 19A. The center frame 20 extends downward from the head pipe 18 and is arranged at the center in the vehicle width direction.

The lower rear cross frame 94 extends from the lower end of the center frame 20 to the left and right lower frames 19B. Further, the lower rear cross frame 94 is curved so as to be convex upward when viewed from the front of the vehicle, the uppermost portion 94a overlaps the floor frame 22 when viewed from the side of the vehicle, and the radiator 66 is discharged below the lower rear cross frame 94. An exhaust passage 120 through which the wind passes is provided. The floor frame 22 extends rearward from the lower part of the left and right down frames 19A and is located above the lower frame 19B.

According to this configuration, the uppermost portion 94a of the lower rear cross frame 94 overlaps with the floor frame 22 when viewed from the side of the vehicle, so that the exhaust passage 120 can be formed higher and the cross-sectional area of the exhaust passage 120 can be made larger. The exhaust air of the radiator 66 becomes easy to flow. Therefore, the cooling efficiency of the radiator 66 can be improved.

Further, as shown in FIG. 9, a lower front cross frame 81 for connecting the lower parts of the left and right down frames 19A and an undercover 61 for protecting the lower part of the vehicle body are provided, and the undercover 61 is used as the lower front cross frame 81. Fix from below.
According to this configuration, the lower end of the radiator 66 can be arranged more forward by utilizing the space above the lower front cross frame 81, and the radiator 66 can be tilted more backward. As a result, the cooling efficiency of the radiator 66 can be further improved.

For example, in the present embodiment, the undercover is provided with an engaging portion that engages with the upper portion of the lower front cross frame 81, and the undercover is fixed to the lower front cross frame 81 at this engaging portion. , The lower end position of the radiator 66 can be arranged further forward. As a result, the radiator 66 can be tilted further backward. As a result, the cooling efficiency of the radiator 66 can be further improved.

Further, as shown in FIG. 9, the undercover 61 includes a front engaging portion 61a projecting upward, and the front engaging portion 61a is engaged and fixed to the lower front cross frame 81 from below. NS.
According to this configuration, the undercover 61 can be easily assembled to the lower front cross frame 81.

The above-described embodiment shows only one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.

10 Motorcycles (saddle-riding vehicles)
18 Head pipe 19A Down frame 19B Lower frame 19e Lower radiator mounting bracket (bracket)
20 Center frame 22 Floor frame 61 Undercover 61a Front engaging part (engaging part)
66 Radiator 81 Lower front cross frame (lower first cross frame)
81a Center part 81b End part Bent part (end part)
94 Lower rear cross frame (lower second cross frame)
94a Top 120 Exhaust air passage

Claims

In a saddle-riding vehicle having a pair of left and right down frames (19A) extending downward from the head pipe (18) and a radiator (66) arranged at the front of the vehicle.
When viewed from the side of the vehicle, the upper end of the radiator (66) is arranged behind the down frame (19A), and the lower end of the radiator (66) is located at a position overlapping the down frame (19A) or the down frame (19A). A saddle-riding vehicle characterized by being placed in front of 19A).
A lower first cross frame (81) for connecting the lower parts of the left and right down frames (19A) is provided.
The lower first cross frame (81) is a center portion (81a) located between a pair of left and right end portions (81b) extending forward and downward from the lower portion of the down frame (19A) and the left and right end portions (81b). ) And
The upper end of the radiator (66) is supported on the rear side of the down frame (19A).
The saddle-riding vehicle according to claim 1, wherein the lower end of the radiator (66) is supported by the center portion (81a).
The saddle-riding vehicle according to claim 2, wherein the lower end of the radiator (66) is fixed to a bracket (19e) protruding forward from the center portion (81a).
A lower frame (19B) extending rearward from the lower ends of the left and right down frames (19A), a center frame (20) extending downward from the head pipe (18) and arranged in the center in the vehicle width direction, and the center. The lower second cross frame (94) extending from the lower end of the frame (20) to the left and right lower frames (19B) and the lower frame (19B) extending rearward from the lower part of the left and right down frames (19A). A floor frame (22) located above is provided, the lower second cross frame (94) is curved so as to be convex upward when viewed from the front of the vehicle, and the uppermost portion (94a) is the floor when viewed from the side of the vehicle. A third aspect of the present invention, wherein an exhaust passage (120) is provided below the lower second cross frame (94) so as to overlap the frame (22) and allow the exhaust air of the radiator (66) to pass through. The saddle-riding vehicle described in any one of the items.
A lower first cross frame (81) for connecting the lower parts of the left and right down frames (19A) and an undercover (61) for protecting the lower part of the vehicle body are provided, and the undercover (61) is used as the lower first cross frame. The saddle-riding vehicle according to any one of claims 1 to 4, wherein the vehicle is fixed to (81) from below.
The undercover (61) includes an engaging portion (61a) projecting upward, and the engaging portion (61a) is engaged and fixed to the lower first cross frame (81) from below. The saddle-riding vehicle according to claim 5.