JP2694905B2 - Motorcycle cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a motorcycle cooling device, and in particular, when an air cleaner is arranged in a recess of a fuel tank or the like mounted so as to straddle a tank rail. The present invention relates to an improvement in an air passage that can reliably discharge hot air accumulated around the engine to the outside and prevent discomfort caused by the hot air flowing out to the feet of an occupant.

[Conventional technology]

In a motorcycle, a fuel tank or the like may be mounted so as to straddle a tank rail, and an air cleaner may be arranged in a recess of the tank or the like. When such a structure is adopted, hot air from the engine and the radiator is likely to stay around the air cleaner, so that high temperature air is sucked into the engine via the air cleaner, and there is a concern that the charging efficiency may be reduced.

Therefore, in order to prevent this problem, there is an example in which an outside air intake port is formed in the vehicle body cover and the outside air is directly introduced into the air cleaner (see, for example, JP-A-63-57384).

[Problems to be solved by the invention]

In the device described in the above publication, the outside air can be directly introduced into the air cleaner, so that the deterioration of the engine performance due to the decrease of the filling efficiency can be suppressed. However, even in this conventional example, it is not possible to completely prevent hot air from the engine and radiator from staying around the air cleaner, and more reliable hot air discharge is required. Also, in conventional motorcycles, most of the hot air from the radiator and engine flows to the rear of the vehicle as it is and flows out to the vicinity of the feet of the occupant, which causes discomfort to the occupant especially in summer. There are also problems.

Therefore, the present invention has been made in view of the above conventional problems, and can provide a cooling device for a motorcycle that can reliably discharge hot air accumulated around the air cleaner and that does not give an occupant a discomfort. Has an aim.

[Means for solving the problem]

According to the present invention, a radiator is arranged behind and below a head pipe, a large fuel tank or the like is mounted so as to straddle a tank rail connected to the head pipe, and the left and right portions of the fuel tank or the like are described above. A motorcycle that extends downward near the height of the lower end of a radiator and has an air cleaner disposed in a recess such as the fuel tank, wherein the hot air around the engine and the engine is discharged by running wind. The front side of the vehicle and the side extending from the head pipe to the radiator are surrounded by a vehicle body cover, and the rear end of the vehicle body cover is brought into contact with the outer wall of the fuel tank or the like to introduce traveling wind to the front portion of the radiator of the vehicle body cover. The upper opening of the engine, the lower part of the inner wall of the fuel tank, etc., and the lower surface of the air cleaner from the lower opening. A lower air passage for flowing the escaped hot air to the rear of the vehicle is formed, and a pair of left and right upper openings for introducing traveling wind are formed above the radiator of the vehicle body cover, and an upper side of an inner wall of a fuel tank, Also, the left and right walls of the air cleaner constitute an upper air passage that allows the traveling wind from the upper opening to flow rearward of the vehicle and mix with the air in the lower air passage.

[Action]

According to the cooling device of the present invention, most of the hot air from the radiator and the engine flows to the rear of the vehicle through the lower air passage. Also, the hot air around the air cleaner is
The running wind (normal temperature air) from the upper opening causes the air to flow toward the rear of the vehicle through the upper air passage, and the normal temperature air is mixed with the hot air in the lower air passage and then discharged near the foot of the occupant.

As described above, in the present invention, since the hot air staying around the air cleaner is forcibly discharged by the traveling wind, the air sucked by the air cleaner is at about room temperature, and the deterioration of the engine performance can be suppressed more reliably. Further, most of the room temperature air is mixed with the hot air flowing through the lower air passage to lower the temperature thereof, so that the occupant's discomfort can be suppressed.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 14 are views for explaining a cooling device for a motorcycle according to an embodiment of the present invention.

In the figure, reference numeral 1 is a motorcycle in which the embodiment apparatus is adopted, and a body frame 2 of the motorcycle has a head pipe 2a
A book rail 2b is connected, a pair of left and right arm brackets 2c are connected to the rear end of the tank rail 2b, and both brackets 2c and the head pipe 2a are connected by a pair of left and right down tubes 2d. Has become. And the above head pipe 2a
As a result, a front fork 4 that supports the front wheel 3 at the lower end is supported to be steerable left and right. Further, the rear arm bracket 2b of the vehicle body frame 2 pivotally supports a rear arm 6 that pivotally supports the rear wheel 5 at the rear end in a vertically swingable manner, and further, in the center of the vehicle body frame 2, an engine unit 9 Is suspended and supported.

The engine unit 9 is a water-cooled 4-cycle parallel 2
The cylinder type, the cylinder body 11, the cylinder head 12, and the head cover 13 are mounted on a crankcase 10 in a forwardly inclined state of approximately 45 degrees in a vehicle-mounted state.
A pair of left and right down-draft carburetors 14 are connected to the rear side of the cylinder head 12 via a joint 14a.

Also, the left and right down tubes of the body frame 2 described above.
A radiator 27 is bridged between 2d, and brackets 27a at its four corners are bolted and fixed to the down tube 2d. A fuel tank 7 is mounted on the upper portion of the vehicle body frame 2, and a seat 8 is mounted behind the fuel tank 7. The fuel tank 7 has a concave cross section (third part) that straddles the head pipe 2a and the tank rail 2b of the vehicle body frame 2.
(See the drawing) and is large, and the recess 7a is open at the lower side and the front side. The lower end edges of the left and right tank chambers 7c of the fuel tank 7 are extended downward to substantially the same height as the lower end of the radiator 27.

An air cleaner 15 is housed in the recess 7 a of the fuel tank 7. The air cleaner case 16 of the air cleaner 15 is made of resin, and is formed in a saddle shape straddling the tank rail 2b. Also, this air cleaner case
Reference numeral 16 has a two-part structure composed of a front case 17 and a rear case 18, and is disassembleably coupled by a coupling bolt 19a. After this, inside the case 18, the insertion opening 18a on the bottom
The intake pipe 14b is inserted from above, the upper end of which is opened into the rear case 18, and the lower end thereof is connected to the carburetor 14.

A fixing bracket 17b is integrally formed at the center of the front case 17 in the vehicle width direction, and the bracket 17b is fixed to the tank rail 2b by fixing bolts 17c. Further, an element insertion opening 17a is formed on a pair of left and right front side walls of the front case 17 so as to face the front of the vehicle, and a resin guide pipe 20 is formed below the element insertion opening 17a.
Are fixed with fastening bolts 19b. This guide pipe 2
0 is for introducing outside air into the air cleaner 15, the lower end opening 20a thereof faces the left and right inner side walls 7b of the fuel tank 17, and the upper end opening 20b is the insertion opening 1 of the front case 17.
It is located at the lower edge of 7a.

The element unit 21 is inserted into the front case 17 from the insertion opening 17a. In this element unit 21, an element 23 having an elliptic cylindrical shape, one end of which is closed by a bottom plate 23a, is adhesively fixed to a lid 22 made of resin, and the peripheral edge of the lid 22 is the front case 17 by a fastening bolt 19c. It is detachably attached to. An introducing cylinder 22a is integrally formed with the lid portion 22, one end of which is open in the element 23, and the other end is inserted into the guide pipe 20. The introduction cylinders 22a, 22a of the left and right element units 21 are communicated with each other by a communication pipe 24.

Note that reference numeral 25 denotes a breather case, which is made of resin and has a structure in which a sub chamber 25b communicating with the main chamber 25a is integrally formed, and the sub chamber 25b is the main pipe 2 described above.
Fixed to b. In addition, the main chamber 25a has a connection hose 26
It is connected to the head cover 13 at a, and the sub chamber 25a
Is connected to the rear case 18 of the air cleaner 15 by a connection hose 26b.

The front of the body frame 2 and the head pipe 2a
The lateral side extending from to the radiator 27 is surrounded by a vehicle body cover 30. The vehicle body cover 30 has a three-part structure including a front cover 31 that surrounds the front of the vehicle and left and right side covers 32 and 32 that surround the left and right sides. The upper portions 32a and the lower portions 32b of the rear end edges of the both side covers 32 contact the outer wall of the fuel tank 7, and the central portion 32c bulges outward to form an opening with the outer walls. And above
Two places of 32a and one place of lower part 32b are bolted and fixed to a bracket 7e formed on the outer wall of the fuel tank 7. Further, an engagement piece 32d protrudingly provided on the inner surface of the lower edge portion of the side cover 32 is engaged with the grommet 2e fixed to the down tube 2d. Furthermore, the front edge 32e of the side cover 32 is fixed to the left and right edges 31a of the front cover 31 with rivets 31d so as to be disassembled.

The lamp opening 31 is formed on the front wall of the front cover 31.
b is formed, and the lamp housing 33 holding the lamp 33a is inserted and arranged in the opening 31b. Both ends of the upper edge of the lamp housing 33 and a central portion of the lower edge are fixedly held by the lamp stay 34 via brackets 33b. As shown in FIG. 12, the ramp stay 34 has a substantially rectangular main pipe 34a, and the left and right vertical sides are connected by a horizontal pipe 34b, and the horizontal pipe 34b and the main pipe 34b are connected to each other.
The lower side and the upper side of 34a are connected by a vertical pipe 34c and a support bracket 34d. And this support bracket
34d, main pipe 34a, horizontal, vertical pipe 34b, 34c,
A meter unit 36 such as a speedometer, a cooling water supply pipe 38 to the radiator 27, and various electric components 37 are supported.

Further, a meter visor 31c extending upward so as to cover the front side of the meter unit 36 is integrally formed on the upper portion of the front cover 31. Also this meter visor 31c
A meter panel 40 for filling the gap is provided in the gap between the meter unit 36 and the meter unit 36.
The support bracket portion 40a is fixed to the meter unit 36 via the grommet 40b. Furthermore, a screen 3 made of transparent resin is provided on the front side of the meter visor 31c.
5 are arranged and fixed by rivets 35b, and a communication hole 35a is formed in the lower portion of the screen 35. The communication hole 35a is for introducing the traveling wind between the screen 35 and the meter visor 31c.

A lower opening 41 is formed at the lower part of the front side wall of the vehicle body cover 30 by the lower end edge of the front cover 31 and the front end edges of the left and right side covers 32.
Is located within this lower opening 41. Also the radiator
In the rear space of 27, the head cover 13 of the engine unit 9, the upper surface of the cylinder body 12, the left side of the fuel tank 7,
A lower air passage 42 formed by the lower portion of the right inner wall 7b and the lower surface of the air cleaner 15 is formed, which allows the hot air (arrow A in the figure) passing through the radiator 27 from the lower opening 41 to have a relatively high temperature. It is designed to lead to the rear of the vehicle.

An upper opening 32f is formed in the upper portion of the left and right side covers 32. In the space behind the upper opening 32f, an upper air passage 43 is formed which is composed of the left and right inner side walls 7b of the fuel tank 7 and the left and right side walls of the air cleaner 15. Room temperature air (arrow B shown in the figure) having a low temperature introduced through the opening 32f is introduced near the air cleaner 15, and is guided to the rear of the vehicle and merges with the hot air A. The second
As shown by the three-dot chain line in the figure, the duct 3
2h may be connected and opened in the recess 7a of the fuel tank 7.

 Next, the operation and effect of this embodiment will be described.

In the cooling device of this embodiment, the lower opening 41 of the vehicle body cover 30 is
When the traveling wind introduced from the vehicle cools the cooling water when passing through the radiator 27 or comes into contact with the cylinder head 12 or the like, it becomes hot air A having a relatively high temperature and passes through the lower air passage 42 to the rear of the vehicle. Be led to.

In addition, a part of the running wind introduced into the upper air passage 43 from the upper opening 32f of the side cover 32, that is, a part of the low temperature room temperature air B is sucked into the air cleaner case 16 from the guide pipe 20 through the element 23. It is sucked into the cylinder through the vaporizer 14. Further, the remaining room temperature air B is guided to the rear of the vehicle through the upper air passage 43, merges with the hot air A in the vicinity of the arm bracket 2c, and is then discharged near the feet of the occupant.

As described above, in the apparatus of this embodiment, the lower air passage 42 for the hot air A whose temperature has risen by cooling the radiator 27 and the like, and the upper air passage 43 for the room temperature air B that is not likely to rise in temperature are independently provided. Since it is provided, the hot air around the engine and the air cleaner can be reliably discharged. That is, when a large fuel tank straddling the tank rail is provided, hot air from the radiator and the engine is trapped in the tank recess, which is sucked into the air cleaner, which tends to reduce the filling efficiency of the engine. In the present embodiment, this warm air is surely discharged by the room temperature air B flowing in the air passage 43, and the room temperature air B flowing in the air passage 43 is sucked into the air cleaner 15, so that the problem of the decrease in filling efficiency can be solved. .

Then, in the conventional device configured to simply discharge the hot air that has passed through the radiator to the rear of the vehicle, this high temperature air will flow out near the feet of the occupant, which may cause discomfort to the occupant. Then, since the hot air A mixes with the room temperature air B to lower the temperature and then flows out to the feet of the occupant, the problem of the discomfort can be solved.

Furthermore, in the above embodiment, since the element unit 21 is detachably attached to the front case 17 of the air cleaner 15, the element can be replaced with the fuel tank 7 attached by rotating the front fork 4. It will be possible. Incidentally, since the conventional air cleaner has a structure in which the element is pulled out upward, the fuel tank is removed when the element is replaced, and there is a problem that maintainability is low.

As shown by the three-dot chain line in FIG. 2, the opening 32f is
When the duct 32h is connected to and the duct 32h is opened near the air cleaner, there is an effect that the outside air can be directly supplied to the air cleaner, that is, the hot air passing through the radiator is not mixed at all.

〔The invention's effect〕

As described above, according to the motorcycle cooling device of the present invention, since the lower air passage through which the hot air that has passed through the radiator flows and the upper air passage through which the traveling air flows as it is are provided, the motorcycle air is retained around the air cleaner. There is an effect that the hot air can be surely discharged to the outside to prevent the deterioration of the engine performance, and the hot air is discharged to the outside after the temperature is lowered by the mixing of the room temperature air, so that the passenger's discomfort can be prevented. There is.

[Brief description of the drawings]

1 to 14 are views for explaining a cooling device for a motorcycle according to an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a partial sectional plan view, and FIG. Front view, FIG. 4 is a left side view of the vehicle body cover, FIG. 5 is a right side view near the headlamp, FIG. 6 is its front view, FIG. 7 is a plan view around the meter unit, and FIG. 8 is a screen. 9 is a sectional side view of a portion, FIG. 9 and FIG. 10 are sectional views taken along line IX-IX and sectional view taken along line XX of FIG. 4, and FIG. 11 is a sectional view taken along line XI-XI of FIG. Is a rear view of the lamp stay, FIG. 13 is a front view of a motorcycle to which this embodiment is applied, and FIG. 14 is a left side view thereof. In the figure, 1 is a motorcycle, 2a is a head pipe, 2b is a tank rail, 4 is a front fork, 7 is a fuel tank, 7a is a recess of the fuel tank, 7c is left and right tank chambers (left and right parts), 9 Is an engine unit, 15 is an air cleaner, 27 is a radiator, 30 is a vehicle body cover, 32a and 32b are rear end portions of the vehicle body cover, 32f is an upper opening, 41 is a lower opening, 42 is a lower air passage, 43 is an upper air passage, A is hot air and B is room temperature air.

Claims (1)

(57) [Claims] 1. A large fuel tank or a tank cover, in which a head rail pivotally supporting a front fork is connected to one tank rail extending obliquely rearward and downward, and a radiator is arranged rearward and downward from the head pipe. (Hereinafter referred to as a fuel tank, etc.) is mounted so as to straddle the tank rail, and the left and right parts of the fuel tank, etc. are extended downward to near the height of the lower end of the radiator, and are installed in the recesses of the fuel tank, etc. A motorcycle in which an air cleaner is arranged is a cooling device configured to discharge hot air around the air cleaner and the engine by traveling wind, and surrounds a front side of the vehicle and a side extending from a head pipe to a radiator with a body cover and The rear end of the cover is brought into contact with the outer wall of the fuel tank, etc., and the lower part of the vehicle body cover is opened at the front of the radiator for introducing the running wind. The upper surface of the engine, the lower portion of the inner wall of the fuel tank, etc., and the lower surface of the air cleaner form a lower air passage through which the hot air passing through the radiator from the lower opening flows toward the rear of the vehicle. A pair of left and right upper openings for introducing running air is formed above the radiator, and the running air from the upper opening is directed to the rear of the vehicle by the upper part of the inner wall of the fuel tank and the left and right side walls of the air cleaner. A cooling device for a motorcycle, wherein the air passage is formed to flow and mix with the air in the lower air passage.