JP2958698B2 - Radiator mounting structure for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a radiator mounting structure for a motorcycle equipped with a water-cooled engine.

(Prior art)

Generally, in a motorcycle equipped with a water-cooled engine, a radiator for engine cooling water is positioned relatively above the front wheel and the engine. Conventionally, in order to further increase the cooling capacity of such a radiator, there has been proposed a configuration in which a sub radiator is provided in a lower portion of a vehicle body in addition to the radiator provided in an upper portion of the vehicle body. (See Japanese Patent Publication No. Sho 62-45113.) However, the radiator provided at the lower part of the vehicle body of the above-mentioned conventional motorcycle is disposed in front of the engine body so as to overlap in the front-rear direction. Cooling wind collided with the engine body and did not flow smoothly. For this reason, heat exchange in the radiator is not promoted, and there is a disadvantage that the cooling performance cannot be sufficiently exhibited.

Further, since the lower radiator is located immediately behind the front wheel, the front wheel blocks the cooling air for the radiator, and this also lowers the cooling performance of the radiator. Further, the pitch or the like of the rolled-up front wheels tends to adhere to the core of the radiator, which further deteriorates the cooling performance.

[Problems to be solved by the invention]

An object of the present invention is to provide a motorcycle radiator mounting structure that solves the above-mentioned conventional problems and improves the cooling performance of a radiator provided in a lower part of a vehicle body.

[Means for solving the problem]

In order to achieve the above object, a motorcycle radiator mounting structure according to the present invention is a motorcycle in which a water-cooled engine whose cylinder projects diagonally forward and downward is mounted on a vehicle body and the front and both sides of the vehicle body are covered with a cowl. The two radiators are arranged in an inverted C shape on the left and right as viewed from the front, and the inner core surface is inclined obliquely in the longitudinal direction of the vehicle so that the inner core surface expands forward, so that the cylinder is formed between the two radiators. The lower part of the cowl is formed in a V shape when viewed from the front to cover the sides of both radiators, and the ventilation inlets are opened on the front left and right sides of the lower part and viewed from the front. Arranged in an inverted C shape sandwiching both sides of the front wheel,
Ventilation outlets are opened at the left and right sides of the cowl, and ventilation paths are formed between the left and right ventilation inlets and the ventilation outlets with a ventilation plate provided inside the cowl. A radiator is provided.

〔Example〕

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

1 to 3 show a main part of a motorcycle having a radiator mounting structure according to the present invention, in which 1 is a vehicle body frame, 2 is a water-cooled engine including front and rear V-shaped two-cylinders 2a and 2b, 3 Is the front wheel. The engine 2 mounted on the body frame 1 causes the front cylinder 2a to project obliquely downward on the front side, while the rear cylinder 2b leans obliquely upward on the front side, and a carburetor 4a for these cylinders 2a, 2b. , 4b are arranged so as to face diagonally outward in the left-right direction. Further, due to such an arrangement of the front and rear cylinders 2a and ab and the carburetors 4a and 4b, the exhaust pipes 20a and 20b both extend rearward from the rear surface of each cylinder.

Between the engine 2 and the front wheels 3, a main radiator 5 is disposed at an upper portion for cooling engine cooling water, and sub left and right radiators 6 a and 6 b are disposed at a lower portion of the vehicle body behind the front wheels 3. Two are arranged so as to form an inverted C shape when viewed from the front. The latter radiators 6a, 6b are attached to the vaporizers 4a, 4b via stays or the like.

In addition, the front and both left and right sides of the vehicle body are covered by cowls 12. The lower part of the cowl 12 is formed to form a V shape when viewed from the front, covers the sides of the radiators 6a, 6b, and has ventilation openings 13, 13 on the left and right front surfaces of the lower part. The left and right ventilation inlets 13, 13 are arranged so as to form an inverted C across both sides of the front wheel 3 when viewed from the front. Cowl
Vent outlets 14 and 14 are opened on the left and right sides of the side 12, and the left and right vent inlets 1 and 12 are provided by wind guide plates 12 a and 12 a provided inside the cowl 12.
Ventilation passages X, X are formed between the ventilation holes 3, 13 and the ventilation outlets 14, 14, respectively (see FIG. 4). Radiators 6a, 6b are arranged in the middle of the ventilation paths X, X, respectively. As shown by arrows in FIG. 4, the cooling air (running air) entering from the left and right ventilation inlets 13, 13 passes through the radiators 6a, 6b, respectively, and is again discharged to the outside from the ventilation outlets 14, 14. It has become.

The two radiators 6a and 6b, which form an inverted C shape in the lower part, are inclined obliquely in the longitudinal direction of the vehicle body so that the inner core surface expands forward, and the front cylinder 2a is interposed between the radiators 6a and 6b. It is arranged to be inserted into the space formed.

With such an arrangement, the cooling air passing through the radiators 6a and 6b can smoothly pass through both outer sides of the engine without being obstructed by the engine body, and the smooth flow of the cooling air allows the cooling air to flow through the radiators 6a and 6b.
Cooling efficiency can be improved. Further, since the ventilation inlets 13 and 13 for the radiators 6a and 6b are arranged so as to form an inverted C across both sides of the front wheel 3 when viewed from the front, the front wheels 3
Thus, the cooling air to the radiators 6a and 6b is not hindered, and the pitch or the like of the front wheels 3 jumping up hardly adheres to the cores of the radiators 6a and 6b. Therefore, it is possible to prevent a decrease in the amount of cooling air blocked by the front wheels 3 and a decrease in cooling performance due to the attachment of a jumped pitch or the like.

Further, in the cowl 12, ventilation passages X, X are provided between the left and right ventilation inlets 13, 13 and the ventilation outlets 14, 14 by the baffle plates 12a, 12b.
By arranging the radiators 6a, 6b therein, the running radiators 6a, 6b flowing from the ventilation inlets 13, 13 and flowing neatly through the ventilation paths X, X do not cause a large turbulence. Since it can pass through and can flow out of the ventilation outlets 14, 14, the heat exchange efficiency can be improved, the cooling performance of the radiator can be further improved, and the air resistance by the radiators 6a, 6b during traveling can be reduced. Can be.

Moreover, since the front cylinder 2a is disposed so as to be inserted into the space formed between the radiators 6a and 6b, the vehicle body is shortened in order to shorten the wheel base as compared with a vehicle in which the radiator is located in front of the engine 2. It becomes possible to make it compact.

Further, in the above embodiment, since the radiator is divided and arranged at three places, the cooling surface area is increased and the flow path of the cooling water is lengthened, so that the cooling performance is also improved from this point. In this embodiment, the radiators 5, 6a, and 6b, which are separately arranged at the three locations, are connected in series by a connecting pipe, and the cooling water flows through these radiators sequentially. Since the cooling water flows evenly to each radiator by such serial connection, the cooling effect can be further improved.

That is, the main radiator 5 is connected to the sub radiator 6a by the connecting pipe 7, the radiator 6a is connected to the adjacent radiator 6b by the connecting pipe 8, and the radiator 6b is connected to the cooling water pump 11 by the connecting pipe 9. ing. The cooling water pump 11 is provided with the radiators 5, 6a, 6
b, the cooling water cooled in sequence is supplied to a jacket (not shown) of the front cylinder 2a and then supplied to a jacket (not shown) of the rear cylinder 2b to cool the engine cylinder. Thereafter, the fluid is returned to the main radiator 5 by the connecting pipe 10 again.

In the above embodiment, the connecting pipe 9 from the radiator 6b is used.
Is turned to the opposite side to connect to the cooling water pump 11, but in the case of an engine in which the cooling water pump 11 is provided on the same side as the radiator 6b, as shown in FIG. Can be.

In the above embodiment, the left and right radiators 6a, 6b
On the other hand, the connecting pipes 8 and 9 are fixed in a fixed positional relationship. However, as shown in FIGS. 5 and 6, the connecting pipes 8 and 9 are connected to the radiators 6a and 6b by a large number of bolt holes 15,. , 15,
These bolt holes 15, ..., 15 are arbitrarily selected, and pipes 8,9
The flange portions 16 and 17 may be attached. By enabling such selective mounting, the opening angle of the inverted radiators 6a and 6b can be adjusted, and by adjusting the opening angle, the cooling effect can be further increased. .

〔The invention's effect〕

As described above, the radiator mounting structure of the present invention is a motorcycle in which a water-cooled engine whose cylinder projects diagonally forward and downward is mounted on the vehicle body and the front and both sides of the vehicle body are covered with a cowl. The radiator is arranged in an inverted C shape as viewed from the front, and the inner core surface is inclined obliquely in the vehicle front-rear direction so that the inner core surface expands forward, and the cylinder is placed in a space formed between the two radiators. The lower part of the cowl is formed in a V shape when viewed from the front to cover the sides of both radiators, ventilation openings are opened on the front left and right sides of the lower part, and both sides of the front wheel when viewed from the front. The cowl is arranged in an inverted C shape, ventilation openings are opened on the left and right sides of the cowl, and ventilation passages formed inside the cowl form ventilation paths between the left and right ventilation inlets and ventilation outlets, respectively. And the air bribe It is obtained by placing the radiator in the middle.

Therefore, a ventilation passage is formed between the left and right ventilation inlets and the ventilation outlet by the ventilation plate provided inside the cowl, and the left and right radiators are arranged in the middle of the ventilation passage, so that the cooling air passing through the radiator is provided. Can flow smoothly without being hindered by the engine body, so that the cooling performance of the radiator can be improved.

In addition, since the left and right ventilation inlets for both radiators are arranged in an inverted C shape so as to sandwich both sides of the front wheel when viewed from the front,
The cooling air to the radiator is not blocked by the front wheels,
Further, since the core portion is hardly soiled by the pitch or the like jumped up by the front wheels, the cooling performance can be further improved.

Furthermore, by arranging radiators in the left and right ventilation paths formed between the ventilation inlet and the ventilation outlet by the ventilation plate, the traveling wind flowing from the ventilation inlet and flowing neatly through the ventilation path causes large turbulence. Since the air passes through the entire radiator and flows out from the ventilation outlet without generation, the cooling performance of the radiator can be improved by improving the heat exchange efficiency, and the air resistance by the radiator during traveling can be reduced.

In addition, the cylinder that projects obliquely downward and forward is arranged so as to be inserted into the space between the radiators, so the wheelbase can be shorter than the vehicle with the radiator located in front of the engine. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a motorcycle having a radiator mounting structure of the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a left side view thereof, and FIG. FIG. 5 is a top view of a radiator provided in a lower part of the vehicle body, FIG. 6 is a bottom view of the same, and FIG. 7 is a schematic front view of a motorcycle according to another embodiment. 1 ... body frame, 2 ... water-cooled engine, 2a ... cylinder, 3 ... front wheels, 5 ... radiator (upper body)
6a, 6b ... radiator (at the lower part of the vehicle body), 12 ... cowl, 12a ... air guide plate, 13 ... air inlet, 14 ... air outlet, X ... air passage.

Claims (1)

(57) [Claims] 1. A motorcycle in which a front side and both sides of a vehicle body equipped with a water-cooled engine having a cylinder projecting obliquely downward and forward are covered by a cowl, two radiators are provided on the right and left lower portions of the vehicle body behind the front wheels when viewed from the front. And the front core cowl is inclined so as to be inclined rearward in the forward direction of the vehicle body so that the inner core surface expands forward, and the cylinder is inserted into a space formed between the two radiators. Is formed in a V shape when viewed from the front, and covers the sides of both radiators,
Ventilation inlets are opened on the front left and right sides of the lower part and arranged in an inverted C shape that narrows both sides of the front wheel as viewed from the front, ventilation openings are opened on the left and right sides of the cowl, and provided inside the cowl. A radiator mounting structure for a motorcycle, wherein a ventilation passage is formed between each of the left and right ventilation inlets and the ventilation outlet by a ventilation plate, and the radiator is arranged in the middle of the ventilation passage.