JP3801254B2 - Motorcycle cooling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device for a motorcycle, and more particularly, to a device provided with a radiator shroud having a novel structure.
[0002]
[Prior art]
A motorcycle for off-road as exemplified in Japanese Patent Application Laid-Open No. 58-89422 is provided with a radiator shroud for introducing a traveling wind from the front covering the left and right sides of the radiator.
[0003]
In the radiator shroud, when viewed from the side, a portion protruding forward from the radiator is formed so as to form a vertically long rectangular shape having the radiator as one side so as to guide the traveling wind from obliquely upward.
[0004]
[Problems to be solved by the invention]
By the way, in the case of the radiator shroud having the structure as in the conventional example, since the traveling wind is guided obliquely from above, the wind guiding efficiency is lowered.
[0005]
For this reason, since the radiator and the radiator shroud have to be relatively large, the width of the vehicle body is increased and the weight is increased, and the running performance is also lowered due to the increase in running resistance.
[0006]
In addition, when taking the riding posture that extends the legs forward during cornering, which is a common riding posture for off-road vehicles, it is necessary to prevent the legs from interfering with the radiator shroud, which limits the design freedom of the radiator shroud. It was.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a cooling device for a motorcycle according to the present invention has a radiator shroud disposed behind a front wheel and in front of an engine, and covering a side of the radiator to guide traveling air to the radiator. In the provided motorcycle cooling device,
The radiator shroud protrudes in a substantially triangular shape with the radiator as a base in a side view, and is provided at a position where the apex is at the height of the substantially middle part in the vertical direction of the radiator.
The opening of the radiator shroud has a curved shape so that the apex protrudes outward in the front view, and the apex that is the outermost in the front view protrudes forward in the side view. together form a vertex, viewed from the front, the hypotenuse of the lower radiator shroud openings forming the curved shape, the vehicle body center side from left to right along the line connecting the lower end of the radiator and the outermost vertex of the It is characterized by entering.
[0008]
In this case, it is possible and introducing the traveling wind from substantially horizontal direction forward toward the front of the La Jieta.
[0009]
【The invention's effect】
The radiator shroud protrudes in a generally triangular shape with the radiator at the bottom in a side view, and its apex is located at a height that is approximately the middle of the radiator in the vertical direction. Can be made as small as possible.
[0010]
For this reason, the radiator shroud can be reduced in size and weight, and the running resistance can be reduced, thereby improving the running performance.
[0011]
Furthermore, by making the side view shape of the radiator shroud into a substantially triangular shape, the position of the apex can be made relatively low and the amount of forward protrusion can be earned, so the distance between the radiator grille and the front wheel need not be too large, The wheelbase can be saved without lengthening it.
[0012]
In addition, the opening of the radiator shroud is curved so that the apex protrudes to the outermost side when viewed from the front, and the lower oblique side is the center of the vehicle body from the left and right along the line connecting the outermost apex and the lower end of the radiator. Since the legs enter the side, the legs are less likely to interfere with the radiator shroud even when the occupant takes a riding posture in which the legs are extended forward. Structure.
[0013]
In addition, if the opening of the radiator shroud is formed in a substantially arc shape when viewed from the front, the apex is at the maximum width and is positioned at an approximately middle part in the vertical direction, so that the lower hypotenuse enters the vehicle body center side from the left and right directions. Furthermore, it becomes difficult to interfere with the leg portion.
[0014]
In addition, if the running wind is taken in from the front substantially horizontal direction by the radiator shroud, the wind guide efficiency is further improved, and the radiator can be reduced in size and weight.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 is an external side view of a motorcycle for an off-road vehicle to which the present invention is applied, FIG. 2 is a side view showing a skeleton part thereof, FIG. 3 is a plan view in which a front part is partially cut away, and FIG. FIG. 5 is a front view in which the rear portion is cut away, FIG. 5 is a front view in which the radiator portion is shown, and FIG. 6 is a cross-sectional view of the radiator portion along line 6-6 in FIG.
[0016]
In these figures, particularly in FIG. 2, the front wheel 1 is supported by the lower ends of the pair of left and right front forks 2, the front fender 3 is supported by the middle portion of the front forks 2, and the handle 4 is attached to the upper end. Yes.
[0017]
The front fork 2 is rotatably supported on the head pipe 7 via the top bridge 5 and the bottom bridge 6.
[0018]
The head pipe 7 is provided at the front end of a pair of left and right main frames 8 that expands left and right and extends rearward (FIG. 3).
[0019]
The rear end of the main frame 8 is connected to a pair of left and right pivot frames 9 extending in the vertical direction.
[0020]
The middle portion of the main frame 8 and the lower end portion of the pivot frame 9 are connected by a pair of left and right down frames 10 that are substantially L-shaped in a side view.
[0021]
A water-cooled two-cycle engine 11 is supported by a portion surrounded by the main frame 8, the pivot frame 9 and the down frame 10, and a radiator 12 connected to the engine 11 is supported by the main frame 8 and the down frame 10. Yes.
[0022]
As apparent from FIG. 6, the radiator 12 has a single structure extending in the left-right direction through the front of the left and right down frames 10, and a radiator grill 13 is attached to the front surface thereof.
[0023]
The radiator grille 13 is arranged in a substantially arc shape so that the protruding end of each louver protrudes longer outwards with the vehicle body center C as the axis of symmetry, and on the outside of the turning locus line L when steering the handle at the rear end of the front fender. It is lined up along.
[0024]
An exhaust pipe 14 connected to the exhaust port of the engine 11 extends rearward of the vehicle body and is connected to the muffler 15.
[0025]
The muffler 15 is supported by a seat rail 16 extending rearward from the main frame 8 and a rear stay 17 extending obliquely upward from the pivot frame 9.
[0026]
The pivot frame 9 supports a front end portion of the rear swing arm 18 so as to be swingable. A rear wheel 19 is supported on the rear end portion of the rear swing arm 18, and a driven sprocket 20 is attached to the side surface thereof.
[0027]
Reference numeral 21 in the figure denotes a rear cushion unit, 22 denotes a fuel tank, 23 denotes a seat, and 24 denotes a rear fender.
[0028]
The vehicle body cover includes a radiator shroud 25 that covers the sides of the radiator 12 and the fuel tank 22, and a side cover 26 that covers the left and right sides of the vehicle body below the seat 23.
[0029]
The radiator shroud 25 expands forward so as to cover both the left and right sides of the radiator 12, and the opening width W1 at the tip is larger than the width W2 of the radiator 12 (W1> W2) (FIG. 4).
[0030]
Further, the radiator shroud 25 protrudes in a substantially triangular shape forward from the radiator 12 in a side view, and the apex 30 is located at a substantially intermediate portion in the vertical direction of the radiator 12.
[0031]
That is, as shown in FIG. 1, the interval H1 between the apex 30 and the upper portion of the radiator 12 and the interval H2 between the lower portion and the lower portion are substantially equal (H1 = H2).
[0032]
As is apparent from FIG. 5, the opening of the radiator shroud 25 surrounds the front surface of the radiator 12 in a substantially arc shape, and its apex 30 is located on the outermost side in the left-right direction.
[0033]
As is apparent from FIG. 5, the upper oblique side 31 of the radiator shroud 25 is inclined upward toward the vehicle body inner side, and the lower oblique side 32 is inclined downward toward the vehicle body inner side .
[0034]
The lower end 33 of the lower hypotenuse 32 substantially coincides with the lower end of the radiator 12 and is connected by a bolt 34 here.
[0035]
The rear lower extension 35 from the lower end 33 is attached to the stay 8a (FIG. 2) protruding from the main frame 8 with a bolt 36 at the rear end.
[0036]
Also on the upper oblique side 31 side, an upper extending portion 37 extending rearward from the radiator 12 is formed, and an upper end portion thereof is attached to a side surface of the fuel tank 22 by a bolt 38. An air vent opening 39 is formed between the upper extension 37 and the lower extension 35.
[0037]
Further, as shown in FIG. 4, the side surface of the upper extension portion 37 comes to knee-grip by being pinched by the knee N in a normal time (upper imaginary line in the figure) when the occupant puts his feet on the step 28. ing.
[0038]
Note that the phantom line on the lower side of FIG. 4 shows a state where the inner leg is extended forward and the foot F is grounded during cornering, which is a unique riding posture in an off-road vehicle.
[0039]
In this case, the outer surface of the radiator shroud 25 is inclined so as to substantially conform to the angle of the extended leg portion.
[0040]
Next, the operation of this embodiment will be described. As shown in FIGS. 4 to 6, the radiator 12 can take in the traveling wind from the front substantially horizontal direction by the radiator shroud 25, and the wind guiding efficiency is improved.
[0041]
For this reason, the radiator shroud 25 can be reduced in size, and as a result, the radiator 12 can be reduced in size and the radiator 12 and the radiator shroud 25 can be reduced in weight.
[0042]
Further, the radiator shroud 25 is reduced in size, so that the running resistance is reduced, and the running performance can be improved accordingly.
[0043]
Further, by making the shape of the radiator shroud 25 in a side view substantially triangular, the position of the apex 30 can be made relatively low to increase the amount of forward protrusion, so that the distance between the radiator 12 and the front wheel 1 is not too large. It can be done without having to lengthen the wheelbase.
[0044]
In addition, since the opening of the radiator shroud 25 has a substantially arc shape when viewed from the front, and the vertex 30 is located at the maximum width and substantially in the middle in the vertical direction, the lower hypotenuse 32 is connected to the outermost vertex 30 and the radiator. The vehicle enters the vehicle body center side from the left-right direction along a line connecting the lower end 12 .
[0045]
As a result, as shown in FIG. 4, even when the user is in a riding posture in which the legs are extended, the legs are less likely to interfere with the radiator shroud 25, particularly the hypotenuse 32 on the lower side.
[0046]
Therefore, the degree of freedom of the radiator shroud 25 in relation to the leg portion is increased, and a structure suitable for an off-road vehicle is obtained.
[0047]
In addition, this invention is not limited to said form, A various application is possible. For example, the radiator may be of a separate type separated into left and right or up and down. The front fender may move up and down integrally with the front wheel.
[Brief description of the drawings]
FIG. 1 is a side view of an exterior of a motorcycle to which the present invention is applied. FIG. 2 is a side view of the skeleton. FIG. 3 is a plan view of an exterior of the motorcycle partially broken. 4] An external plan view in which the rear part of the motorcycle is partially broken. FIG. 5 is a front view in which the front part of the motorcycle is partially broken. FIG. Cross-sectional view along the main section
7: head pipe, 8: main frame, 10: front down frame, 12: radiator, 13: radiator grille, 25: radiator shroud, 30: apex, 31: upper hypotenuse, 32: lower hypotenuse

Claims (2)

In the cooling device for a motorcycle, a radiator is disposed behind the front wheel and in front of the engine, and a radiator shroud is provided to cover the side of the radiator to guide the traveling wind.
The radiator shroud protrudes in a substantially triangular shape with the radiator as a base in a side view, and is provided at a position where the apex is at the height of the substantially middle part in the vertical direction of the radiator.
The opening of the radiator shroud has a curved shape so that the apex protrudes outward in the front view, and the apex that is the outermost in the front view protrudes forward in the side view. The hypotenuse on the lower side of the opening of the radiator shroud that forms the apex and has a curved shape when viewed from the front is along the line connecting the outermost apex and the lower end of the radiator from the left-right direction to the vehicle body center side. A cooling device for a motorcycle characterized by entering.   The cooling device for a motorcycle according to claim 1, wherein traveling wind is introduced into the front surface of the radiator from the front side in a substantially horizontal direction.

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