JPH0460875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cowling device for a motorcycle, and particularly to the structure of a cowling body that covers the area around the engine.

[Prior Art] Conventionally, it is known that a frame supporting an engine and a seat is provided with a cowling that integrally covers the area from around the head pipe at the front end of the frame to the left and right sides of the engine and below the engine.

A running air intake opening that opens in front of the engine is formed on the front surface of the cowling, and if the engine is water-cooled, a radiator is disposed inside the intake opening. Therefore, while driving, the wind taken in from the intake port passes through the radiator, passes between the engine and the left and right sides of the cowling, and is discharged outward from the rear end of the cowling. ing.

Furthermore, even if the engine is a water-cooled type, the temperature around the engine's crankcase becomes high due to heat transfer from the cylinders and heat generation from power transmission parts such as gears. It needs to be cooled down. The running wind that cools the area around the crankcase also flows rearward through the space between the side surface of the crankcase and the inner surface of the cowling, together with the running wind that has passed through the radiator.

[Problem to be solved by the invention] However, after the running wind that cools the area around the crankcase flows into the cowling from the intake port,
It collides with the front of the engine, forcing the flow direction to be divided to the left and right, and since there are unevenness on the sides of the crankcase, there is greater resistance when the wind flows around the crankcase, reducing the flow velocity. .

Therefore, the cooling efficiency around the crankcase deteriorates, and the ventilation inside the cowling also deteriorates, making it easy for engine heat to become trapped there.

In order to increase the ventilation inside this cowling,
All you have to do is widen the left and right width of the lower part of the cowling and widen the gap between the side of the crankcase and the cowling to make it easier for the wind to pass through. However, if this is done, the lower part of the cowling protrudes greatly in the left-right direction, which in turn reduces the bank angle, causing problems such as the cowling becoming more likely to touch the ground during cornering.

The present invention was made based on the above circumstances, and it is possible to improve the ventilation inside the cowling body without increasing the width of the lower part of the cowling body, and to efficiently cool the engine area. To provide a cowling device for a motorcycle capable of lowering the temperature of running air discharged from the rear end and minimizing the thermal influence on a driver.

[Means for Solving the Problems] Accordingly, in the present invention, a cowling body is attached to a frame supporting the engine, and covers the area from around the head pad at the front end of the frame to the left and right sides of the engine and the lower part of the engine. In a motorcycle in which the main body is provided with a running air intake that opens in front of the engine, and the engine heat exchanger is placed inside this intake, there is a motorbike installed on the left and right side surfaces of the cowling main body, and located behind the heat exchanger. At the same time, an exhaust port is provided for discharging the hot air that has passed through the heat exchanger to the outside of the cowling body, and an outlet is provided below the exhaust port to allow outside air to flow between the cowling body and the side surface of the lower part of the engine. It is characterized by having an introduction port for introduction.

[Function] According to this configuration, most of the running air that has passed through the heat exchanger and turned into hot air is discharged to the outside of the cowling body through the exhaust port, and is directed inside the cowling body toward the rear engine side. The amount of hot air flowing will decrease. Moreover, since cold outside air is directly introduced between the lower part of the engine and the cowling body through the inlet, the flow rate of the outside air passing through the inlet is increased. Therefore, the lower part of the engine can be efficiently cooled, and the ventilation within the cowling body can be improved, making it difficult for engine heat to be trapped there.

Furthermore, by providing the inlet on the side surface of the cowling body, there is no need to widen the left and right width of the lower part of the cowling body, and a sufficient bank angle can be ensured.

Furthermore, even if the hot air that cannot escape from the exhaust port flows between the left and right sides of the cowling body and the engine, this hot air mixes with outside air from the inlet inside the cowling body, and the temperature of this hot air increases. is lowered. Therefore, the temperature of the air blown out from the rear end of the cowling body can be kept low, and the thermal effect on the driver is also reduced.

[Embodiment] An embodiment of the present invention will be described below based on the drawings.

The motorcycle shown in FIG. 1 includes a cradle-shaped frame 1. A front fork 25 is supported by a head pipe 1a located at the front end of the frame 1, and a bar handle 6 is attached to the upper end of this front fork 25.

Further, a main pipe 1b extending rearward and a down tube 3 extending downward are connected to the head pipe 1a. These main pipes 1b
A water-cooled V-type engine 2 is supported between the down tube 3 and the down tube 3. This V type engine 2
includes a crankcase 2a, a front cylinder 2b extending forward and substantially horizontally from the front surface of the crankcase 2a, and a rear cylinder 2c extending obliquely upward from the upper surface of the crankcase 2a. A radiator 4 as a heat exchanger is attached to the front surface of the down tube 3. The radiator 4 is connected to the V-type engine 2 via piping (not shown), and the radiator 4 is
It is located above the front cylinder 2b and in front of the rear cylinder 2c.

In addition, in FIG. 1, reference numeral 26 is a fuel tank, and 27 is a seat on which the driver is seated.
is arranged at the rear upper part of the V-type engine 2.

Incidentally, a cowling 5 made of synthetic resin is attached to the frame 1. The cowling 5 includes a cowling body 5a that continuously covers from the front of the head pipe 1a to the right and left sides of the V-shaped engine 2 and the lower part of the V-shaped engine 2. A running air intake 8 that opens in front of the V-shaped engine 2 is formed on the front surface of the cowling body 5a, and the radiator 4 is located inside this intake 8. For this reason,
The running wind taken in from the intake port 8 passes through the radiator 4 and then flows rearward between the V-shaped engine 2 and the left and right side walls of the cowling body 5a.

As shown in FIG. 2, a flange portion 9 is formed at the opening edge of the intake port 8 and extends inward over the entire circumference. The flange portion 9 is provided to improve the appearance of the cowling body 5a and to reinforce the cowling body 5a. Further, a light projecting window 10 is opened in the front surface of the cowling body 5a and is located above the intake port 8 and exposes the front lens of the headlamp 7.

In the center of the left and right side walls of the cowling body 5a,
A bulging portion 20 is formed that projects laterally. As shown in FIGS. 2 and 4, the front end of the bulging portion 20 is flush with and continuous with the outer surface of the cowling body 5a, and the amount of bulging to the side gradually increases as it moves rearward from here. It's getting bigger. A discharge port 11 is formed at the rear end of this bulging portion 20 and continues into the inside of the cowling body 5a. The discharge port 11 is opened toward the rear on the left and right side walls of the cowling body 5a.
1 is located immediately after the radiator 4, as shown in FIG. Therefore, most of the running air that has been converted into hot air by heat exchange with the radiator 4 is discharged to the outside of the cowling body 5a through the exhaust port 11.

Furthermore, recesses 21 are formed on the left and right side walls of the cowling body 5a, and are located below the bulge 20 and are recessed inside the cowling body 5a. As shown in FIG. 5, the front end of the recess 21 is flush with and continuous with the outer surface of the cowling body 5a, and the amount of inward recess of the cowling body 5a gradually increases as it goes rearward from here. There is. and,
An inlet 12 is formed at the rear end of the recess 21 and is connected to the inside of the cowling body 5a. The inlet 12 is located on the side of the front cylinder 2b and at approximately the same height as the crankcase 2a, and through this inlet 12 cold outside air from the front is drawn into the cowling body 5a and the front cylinder. 2b
and the crankcase 2a.

As shown in FIG. 3, such a cowling body 5a is divided into an upper cowling 13, left and right side cowlings 14, 15, and a lower cowling 16.
5 and 16 are integrally connected by a screw 17.

The upper cowling 13 has a front wall 13a and left and right side walls 13b, 13c that are continuous, and has a U-shaped planar shape. The window 10 for light projection is opened in this front wall 13a, and both side walls 13 are opened from the lower edge of this front wall 13a.
The portion extending over the front edge of b and 13c is the intake port 8.
It makes up the upper part of the. A flange forming portion 9a, which becomes a part of the flange portion 9, is formed from the lower edge of the front wall 13a to the front edges of both side walls 13b and 13c.

Note that a transparent screen 18 is attached to the upper edge of the upper cowling 13 with screws 19.

Such an upper cowling 13 is injection molded from a synthetic resin material, and its molding die (not shown) is divided in the direction of arrow A-A' in FIG. 3, that is, in the front-rear direction of the cowling body 5a. As a result, the upper cowling 13 as a product is taken out. Therefore, the window 10 for light projection
It is possible to injection mold the upper cowling 13 having a substantially U-shaped planar shape.

Since the left and right side cowlings 14 and 15 are approximately symmetrical, the left side cowling 14
I will explain on behalf of. This side cowling 14
As shown in FIGS. 4 and 5, it has a gently curved shape in the front-rear direction, and a flange-forming portion 9b, which becomes a part of the flange portion 9, is provided on the front edge of the flange-forming portion 9b. . A bulging portion 20 having the outlet 11 and a recess 21 having the inlet 12 are formed in the side cowling 14. Such side cowling 14 is also injection molded from a synthetic resin material, and its molding die (not shown) is indicated by arrow B in FIGS. 3 and 4.
-B' direction, that is, the left-right direction of the cowling body 5a, and as a result, the side cowling 14 as a product is taken out. Therefore, injection molding of the side cowling 14 having the flange forming portion 9b, the bulging portion 20, the outlet 11, the recess 21 and the inlet 12 is possible.

Further, the lower cowling 16 has a substantially V-shaped or U-shaped vertical cross-sectional shape, and has a flange forming portion 9c that becomes a part of the flange portion 9 at its front edge.
is formed. This flange component 9c is
As shown in FIG. 6, it extends obliquely upward. The lower cowling 16 is also injection molded from a synthetic resin material, and its molding die (not shown) is inserted in the direction of the arrow C-C' in FIGS. 3 and 6, that is, in the vertical direction of the cowling body 5a. be divided.

According to such a configuration, the cowling body 5a
located on the left and right side walls of the radiator 4,
Since the exhaust port 11 is formed to discharge the running air that has passed through the radiator 4 to the outside of the cowling body 5a, most of the running air that has passed through the radiator 4 and turned into hot air is transferred to the rear end of the cowling body 5a. The hot air is discharged to the left and right sides of the cowling body 5a before reaching the temperature range, and the amount of hot air flowing rearward inside the cowling body 5a is reduced compared to the conventional case.

In addition, an inlet 12 is formed on the left and right side walls of the cowling body 5a to introduce cold outside air between the crankcase 2a of the V-shaped engine 2 and the left and right side walls of the cowling body 5a. The outside air is guided between the main body 5a without resistance, and the flow rate of the outside air passing through the main body 5a is increased. Therefore, the area around the crankcase 2a can be efficiently cooled, and good ventilation within the cowling body 5a is maintained, allowing the V-type engine 2
It becomes difficult to contain the heat.

Furthermore, since the outside air is directly introduced around the crankcase 2a in this way, there is no need to widen the width of the lower portion of the cowling body 5a. Therefore, a sufficient bank angle can be ensured, and the cowling body 5a is less likely to touch the ground even when turning.

At the same time, since the inlet 12 is for supplementary intake of running wind into the inside of the cowling body 5a, the opening area is smaller than that of the exhaust port 11, which discharges most of the running wind that has passed through the radiator 4. The less the better. Therefore, the introduction port 12 becomes less noticeable, and the appearance of the cowling body 5a is not impaired.

Furthermore, even if the hot air that has not completely escaped from the exhaust port 11 flows between the left and right side walls of the cowling body 5a and the V-type engine 2, this hot air is absorbed by the cold outside air from the inlet port 12 inside the cowling body 5a. The temperature of the hot air can be lowered, and the temperature of the air blown out from the rear end of the cowling body 5 can be kept low.

Therefore, in addition to reducing the amount of hot air itself, this also prevents the driver from feeling hot even when the outside temperature is high, especially in the summer. It can create a comfortable driving environment.

[Effects of the Invention] According to the present invention described in detail above, most of the running air that has passed through the heat exchanger and turned into hot air flows through the exhaust port to the left and right sides of the cowling body before reaching the rear end of the cowling body. At the same time, outside air is introduced between the lower part of the engine and the cowling body from the inlet ports on the left and right sides of the cowling body without resistance, so the flow rate of the outside air passing through there also increases. Therefore, the area around the engine can be efficiently cooled, and good ventilation within the cowling body is maintained, making it difficult for hot air from the engine to get trapped there.

In addition, since outside air is directly introduced around the lower part of the engine, there is no need to widen the left and right width of the lower part of the cowling body, and a sufficient bank angle can be achieved.

At the same time, a portion of the hot air that has not completely escaped from the exhaust port mixes with the cold outside air from the inlet inside the cowling main body, so that the temperature of the hot air flowing rearward inside the cowling can be lowered. Therefore, not only does the amount of wind blowing out from the rear end of the cowling body decrease, but also the temperature is kept low, so the driver does not feel hot and, together with the windproof effect of the cowling, makes driving more comfortable. You can create an environment.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, FIG.
A side view of the motorcycle, FIG. 2 is a perspective view of the cowling, FIG. 3 is an exploded perspective view of the cowling, and FIG. 4 is a sectional view taken along line - in FIG.
Figure 5 is a sectional view taken along the line - in Figure 3;
The figure is a sectional view taken along the line - in FIG. 3. 1... Frame, 1a... Head pipe, 2...
... Engine (V-type engine), 4 ... Heat exchanger (radiator), 5 ... Cowling, 5a ... Cowling body, 8 ... Intake port, 11 ... Discharge port, 1
2...Introduction port.

Claims (1)

[Scope of Claims] 1. A cowling body is attached to a frame that supports the engine, and covers the area from around the head pipe at the front end of the frame to the left and right sides of the engine and below the engine, and the cowling body has an opening in front of the engine. In a motorcycle that is provided with a running air intake and has an engine heat exchanger arranged inside the intake, a heat exchanger is provided on the left and right sides of the cowling body, located behind the heat exchanger. An exhaust port is provided for discharging the hot air that has passed through the cowling body to the outside of the cowling body, and an inlet port is provided below the exhaust port for introducing outside air between the cowling body and the lower side surface of the engine. A motorcycle cowling device featuring: