JPH0424275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radiator device for a motorcycle.

(Prior art) In conventional motorcycles equipped with water-cooled engines, the engine is placed at the center of gravity of the vehicle body.
A radiator is placed near the center of gravity of the vehicle behind the engine, front, and front wheels, and the radiator is bent into a dogleg shape when viewed from above so as not to interfere with the down tube of the vehicle body frame (Utility Model Publication No. 56-35419)
There is also one with a curved radiator so as not to interfere with the front wheels (Japanese Utility Model Publication No. 59-60022).

(Problems to be Solved by the Invention) In recent years, there has been a trend in motorcycles to mount engines as close to the front wheels as possible in order to make the entire vehicle more compact and to optimize the center of gravity.

In this way, in motorcycles, the space between the front wheel and the engine is narrowed, and the radiator has to be installed just in front of the engine, making it impossible to secure a passage for the traveling air to pass through the radiator. This may reduce the cooling efficiency of the radiator. This is especially noticeable in motorcycles equipped with engines with forward-slanting engines or V-type engines whose cylinder heads protrude forward, so even if the radiator is simply curved as in the conventional example described above, engine attachments such as exhaust pipes etc. There was a risk that there would be interference with other components and that it would not be possible to secure the installation space for the radiator.

Therefore, with the present invention, even if the cylinder head is mounted on a motorcycle equipped with an engine that protrudes forward, the cylinder head can be placed without interfering with attached components such as the front wheel or exhaust pipe, and the cylinder head can be placed without interfering with attached components such as the front wheel or exhaust pipe, while also ensuring a passage for running air behind the radiator. The purpose of the present invention is to provide a radiator device for a motorcycle that can secure the radiator.

(Means for Solving Problems and Effects thereof) The radiator device of the present invention provides a radiator device for use in a motorcycle in which a water-cooled engine whose cylinder head protrudes toward the front of the vehicle body from the cylinder block is mounted behind the front wheel. An upper radiator is arranged above the cylinder head, and a lower radiator is arranged below the cylinder head, and a cowling is provided at the front of the vehicle body to cover the sides of the upper and lower radiators, and the front side of the cowling is An air inlet is opened to form an air inlet, and an air outlet is formed in a portion of the side surface of the cowling rearward of the upper and lower radiators;
When the lower radiator is viewed from above, both sides of the lower radiator are curved toward the front of the vehicle in a U-shape, and a spark plug is placed in the space expanded by this curvature.
An exhaust pipe is arranged, and the distance between the upper and lower radiators and the engine is set to gradually increase from the center of the vehicle body toward the sides of the vehicle body.

Therefore, by curving each radiator into an appropriate shape, each radiator can be installed even in a narrow space without interfering with attached components such as the front wheels or exhaust pipes, and the sides of each radiator and the engine can be easily installed. The space between the two radiators is widened, allowing a passage for air to pass through each radiator.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figure 1 is a side view of the main parts of a motorcycle. In Figure 1, 1 is the motorcycle, 2 is the front wheel, 3 is a front fork that suspends and supports the front wheel 2 from the left and right, and 5 is connected to the head pipe 4. The vehicle body frame, 6 is a fuel tank, 7 is a seat, 8 is a cowling, 9 is a rear fork, and 10 is an engine.

The engine 10 has a hanger bracket 1
1, 12, and 13, and are supported by the vehicle body frame 5, respectively. In this embodiment, the engine 10 is a V-type four-cylinder engine, and the V-shaped cylinder heads 14A and 14B are arranged in the longitudinal direction of the vehicle body, and are located at the center of gravity of the vehicle body. Therefore, the cylinder head 14A located on the front side of the engine 10 is close to the front wheel 2, and is arranged in a position that projects forward of the vehicle body and diagonally upward. still,
In the figure, 15A and 15B indicate cylinder head covers. Further, four exhaust pipes 16 are connected to the lower part of the front cylinder head 14A, and these exhaust pipes 16 pass below the cylinder block 17 and are arranged toward the rear of the vehicle body.

Further, between the engine 10 and the front wheels 2, a first
As shown in the vertical cross section in the figure, the upper radiator 2
0 and a lower radiator 21 are provided. The upper radiator 20 is connected to the front cylinder head 14.
The bulge 18 provided on the head cover 15A of A
The bulging portion 18a located on the lower side of a and 18b
It is disposed above the vehicle body so as to be inclined forward and upward, and is supported by the vehicle body frame 5 by a bracket 22 and by the engine 10 by a bracket 23.
Furthermore, as shown in FIG. 2, the upper radiator 20 is formed into a U-shaped curved shape with both sides facing forward when viewed from above, and the distance between the upper radiator 20 and the engine 10 is It gradually expands from the center of the vehicle to the sides of the vehicle. Therefore, by appropriately setting the curved shape, the spark plugs 24, 24 and the front wheel 2
The upper radiator 20 can be placed above the cylinder head 14A without interfering with the cylinder head 14A.

On the other hand, the lower radiator 21 is disposed approximately vertically below the front cylinder head 14A, and is connected to the engine 10 by a bracket 25 and a connecting member 26.
is supported by Furthermore, as shown in FIG. 3, the four exhaust pipes 16... are arranged together on the front side of the cylinder block 17, two on the left and right, and these left and right exhaust pipes 16,16 and 16,1
The center part of the lower radiator 21 is positioned between the lower radiator 2
The distance between the engine 10 and the engine 10 gradually increases from the center of the vehicle body toward the sides of the vehicle body.
Therefore, by setting the curved shape, the exhaust pipe 16
...and the lower radiator 2 without interfering with the front wheel 2.
1 can be placed below the cylinder head 14A.

Further, the upper radiator 20 is used for engine cooling, and the lower radiator 21 is used for oil cooler, and both of these radiators 2
0 and 21 are formed in a side flow type with cooling water passages in the left and right direction of the vehicle body. Further, in accordance with the positions of the radiators 20 and 21, a running air inlet (not shown) is provided at the front of the cowling 8, and outlet ports 8a and 8b are provided at both sides thereof, respectively.

In this way, in this embodiment, both radiators are placed above or below the cylinder head, and each radiator is appropriately curved in a U-shape, so that the space between the front wheels and the engine is reduced. Even when a narrow V-shaped engine is installed, each radiator can be placed in a narrow space without interfering with attached parts such as spark plugs and exhaust pipes, or with the front wheels.

Furthermore, since each radiator is curved forward from the center to both sides, the distance between both sides of the upper radiator and the cylinder head and the distance between both sides of the lower radiator and the cylinder block are widened. A passage for the traveling air passing through is secured, increasing the amount of traveling air passing through each radiator, and increasing the cooling efficiency of the radiator.

In the above embodiment, the lower radiator is used for the oil cooler, but the present invention is not limited to this, and the lower radiator may be connected in parallel or in series with the upper radiator and used for cooling water. Further, both radiators are not limited to side flow type, but may be of vertical flow type. Furthermore, the engine to be mounted is not limited to a V-type engine, but can also be applied to other engines such as forward-tilting engines as long as the cylinder head protrudes toward the front of the vehicle body.

(Effects of the Invention) As explained above, according to the present invention, even in a motorcycle equipped with an engine in which the cylinder head protrudes forward, and where the space between the engine and the front wheel is slightly narrow, the cylinder head can be moved upward and downward. By arranging each radiator and curving each radiator into a U-shape, each radiator can be reliably placed in a narrow space without interfering with attached components such as spark plugs and exhaust pipes.
Furthermore, since the distance between both sides of each radiator and the cylinder head or cylinder block becomes wider,
It is possible to secure a sufficient passage for the traveling air to pass through each radiator, making it possible to increase the cooling efficiency of each radiator.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a side view showing the main parts of a motorcycle, FIG. 2 is a sectional view taken along the - arrow in FIG. 1, and FIG. It is a sectional view taken along the - arrow in FIG. 1. In the drawing, 1...Motorcycle, 2...Front wheel, 10
...Engine, 14A...Cylinder head, 17
... cylinder block, 20 ... upper radiator, 21 ... lower radiator.

Claims (1)

[Claims] 1. In a motorcycle equipped with a water-cooled engine mounted behind the front wheel with a cylinder head protruding toward the front of the vehicle body from the cylinder block, an upper radiator is installed between the front wheel and the engine and above the cylinder head. , a lower radiator is arranged below the cylinder head, a cowling is provided at the front of the vehicle body to cover the side surfaces of the upper and lower radiators, the front side of the cowling is opened to form an air inlet, and the upper part of the side surface of the cowling is provided. An air outlet is formed in a portion rearward of the lower radiator, and when the upper and lower radiators are viewed from above, both sides thereof are respectively curved in a U-shape toward the front of the vehicle body, and due to this curvature, A radiator for a motorcycle, characterized in that a spark plug and an exhaust pipe are arranged in an expanding space, and the distance between the upper and lower radiators and the engine is set to gradually increase from the center of the vehicle body toward the sides of the vehicle body. Device.