JPH07110628B2 - Motorcycle cowling equipment - Google Patents

Description

The present invention relates to a cowling device for a motorcycle.

[Prior art]

In a motorcycle in which a cowling covers the area around the engine, conventionally, a partition wall is provided between the cylinder and a carburetor behind the cylinder, and an exhaust port is provided on one side of the cowling to connect to the space on the cylinder side. It is known that an outside air inlet connected to the space on the carburetor side is provided on the other side of the side to allow the warm air after engine cooling to escape to the outside of the cowling and at the same time to guide the cool outside air around the carburetor. Has been.

[Problems to be solved by the invention]

However, in this conventional cowling, since the exhaust port and the outside air introduction port are provided only on one side surface of the cowling, the ventilation property inside the cowling and the ventilation property for the carburetor can be improved by the posture of the vehicle body during running and the posture. It tended to depend on the running speed.

Therefore, the hot air of the engine is likely to be trapped in the cowling, and the ambient temperature of the carburetor is likely to fluctuate, which may adversely affect the atomization performance.

The present invention has been made based on such a circumstance, and while maintaining good ventilation around the cylinder, it is possible to suppress fluctuations in the ambient temperature of the carburetor as much as possible, and further, An object of the present invention is to provide a cowling device for a motorcycle, which can have a simplified shape and structure.

[Means for solving problems]

In order to achieve the above object, the present invention provides an engine having an upright cylinder, a carburetor disposed behind the cylinder of the engine, left and right side surfaces that laterally cover the engine and the carburetor, and It is premised on a motorcycle including a cowling main body made of a synthetic resin, which has a cooling air introduction port opened in front of the engine.

A partition wall is provided between the cylinder of the engine and the carburetor, and the partition wall covers the space around the engine covered by the cowling body with the first space in which the cylinder is located and the vaporization. It is divided into a second space in which the vessel is located, the cooling air introduction port is connected to the first space, and mounting holes are formed on the left and right side surfaces of the cowling body. It is characterized in that a duct unit having an exhaust port connected to the space and an outside air intake port connected to the second space is attached.

[Action]

According to this structure, the warm air after the engine is cooled is exhausted to the outside from the exhaust ports on the left and right sides of the cowling body.
The ventilation in the space is always kept good regardless of the traveling speed and the posture of the vehicle body during traveling. Therefore, it is difficult for the hot air of the engine to collect in the cowling body, and the cooling efficiency of the engine is improved.

Also, since the outside air is introduced into the second space where the carburetor is located through the outside air intakes on both the left and right sides, even if the traveling speed or the posture of the vehicle body during traveling changes momentarily, the surrounding space around the carburetor is increased. The cold outside air will be sufficiently guided. For this reason,
The ambient temperature of the carburetor is less likely to fluctuate as compared with the conventional case, and the atomization of the fuel is stably performed.

Moreover, since the exhaust port and the outside air intake port are one unit that is separate from the cowling body, it suffices to simply open a mounting hole for mounting the duct unit on the side surface of the cowling. . Therefore, it is not necessary to form an opening having a complicated shape on the side surface of the cowling body, and the shape and structure of the side surface of the cowling body can be simplified.

Example of Invention

The present invention will be described below based on an embodiment shown in the drawings.

Reference numeral 1 in the drawing is a frame made of an aluminum alloy, and a front fork 3 is pivotally supported on a steering head pipe 2 which is vertically installed at the front end thereof. A pair of left and right main pipes 4 extending obliquely downward and rearward are connected to the steering head pipe 2. The main pipe 4 of this embodiment is formed in a flat rectangular tube shape that is vertically long in the vertical direction, and connects the steering head pipe 2 and a bracket 6 that pivotally supports the rear arm 5 in a substantially straight line shape in a side view.

A down tube 7 is installed between the lower surface of the front end of the main pipe 4 and the lower end of the bracket 6, and a water-cooled two-cylinder engine 8 is mounted between the down tube 7 and the main pipe 4. There is. The engine 8 has a standing cylinder 9, and behind the cylinder 9,
Two vaporizers 10, 10 are arranged side by side. These vaporizers 10, 10 are inserted between the main pipes 4.

A radiator 11 is attached to the upper end of the down tube 7, and the radiator 11 is located in front of the cylinder 9.

Incidentally, reference numeral 12 in FIG. 6 denotes a fuel tank, and the engine 8
And above the vaporizers 10,10.

By the way, an FRP cowling 13 is fixed to the frame 1. The cowling 13 is an upper cowl portion 14 that covers the front front side of the front fork 3 from the front side to the side.
Further, a center cowl portion 15 as a cowling main body which covers the upper cowl portion 14 and covers the engine 8 from both left and right sides downward is provided. On the front surface of the cowling 13, a cooling air introduction port 16 is formed which opens into the internal space of the center cowl portion 15. And this cooling air inlet
Radiator 11 is located in the opening of 16 and
A space around the engine 8 surrounded by the center cowl portion 15 between the cylinder 9 and the carburetors 10, 10.
17 is the first where the cylinder 9 and the cooling air inlet 16 are located
A partition wall 20 for partitioning the space 18 into a second space 19 in which the vaporizers 10, 10 are located is provided.

The carburetor 10 does not include an air cleaner, and its intake port 10a is directly opened in the second space 19.

On the other hand, the left and right side surfaces 21a, 21b of the center cowl portion 15 are provided with mounting holes 22 that open laterally of the cylinder 9. As shown in FIG. 6, the mounting hole 22 is a mere square hole, and the duct unit 23 made of FRP is mounted in the mounting hole 22.

The details of the duct unit 23 will be described with reference to FIG. 1 to FIG.
A support plate 24 screwed to the peripheral edge of the opening 22 is provided, and the support plate 24 has an exhaust port 25 and an outside air intake port 26.
And are lined up and down and integrally molded. The exhaust port 25 is opened at a position facing the side of the cylinder 9 and is connected to the first space 18 in front of the partition wall 20.

Further, the outside air intake port 26 is provided at a portion facing the cylinder 9,
It has a guide surface 27 that is inclined inward as it goes rearward, and is opened rearward at the rear end of this guide surface 27. An air guide duct 28 extending rearward inside the center cowl portion 15 is connected to the opening of the outside air intake port 26. The air guide duct 28 is provided with a duct main body 29 having a U-shaped cross section that opens laterally. The front end of the duct main body 29 is abutted against the outside air intake port 26, and a side panel is provided at the side opening of the duct main body 29. The support plate is formed by stacking 30 and stacking a tape-shaped bonding material 31 made of glass fiber on the abutting portion of the duct body 29, the outside air intake 26 and the side panel 30 and solidifying with a resin. It is integrated with 24. The rear end of the air guide duct 28 is led out into the second space 19 behind the partition wall 20 and faces the left and right sides of the carburetors 10 and 10. The air outlet 32 for the outside air is formed on the opposing surface.

According to this structure, while traveling, the outside air taken in through the cooling air introduction port 16 passes through the radiator 11 and then passes through the inside of the first space 18 inside the center cowl portion 15 to the rear cylinder 9.
It flows toward the side. The outside air, which has passed through the radiator 11 and becomes warm air, is separated by the partition wall 20 into vaporizers 10, 10
Since the flow to the side is blocked, as shown by the solid line arrow in FIG. 1, it is discharged outward from the exhaust ports 25 on both the left and right sides of the cylinder 9.

Therefore, the hot air is easily released, and the ventilation in the first space 18 is always kept good without being influenced by the traveling speed and the posture of the vehicle body during traveling, and the engine 8 is provided in the center cowl portion 15.
It becomes difficult for the hot air to collect, and the cooling efficiency of the radiator 11 also improves.

On the other hand, while traveling, the outside air taken in from the outside air intake port 26 passes through the air duct 28 from the both sides of the carburetors 10, 10 to the second space 1 as shown by the arrows of broken lines in FIGS. 1 and 3.
Since it is introduced into the inside 9, even if the traveling speed and the posture of the vehicle body change momentarily, the cold outside air is sufficiently guided around the carburetors 10, 10.

Therefore, in combination with the fact that the warm air from the front is blocked by the partition wall 20, it becomes difficult for the ambient temperature around the carburetors 10,10 to fluctuate, and there is little variation in the atomization characteristics of the carburetors 10,10 and a stable engine. Performance is obtained.

Moreover, according to the above configuration, the exhaust port 25 and the outside air intake port 26
Since the duct unit 23 formed by unitizing the and is attached to the side surfaces 21a and 21b of the center cowl portion 15, the center cowl portion 1
It is only necessary to open a square mounting hole 22 for mounting the duct unit 23 in the unit 5. Therefore, it is not necessary to integrally form a duct portion having a complicated opening shape in the center cowl portion 15, so that the shape of the center cowl portion 15 can be simplified and the manufacturing operation can be easily performed.

The engine of the motorcycle according to the present invention is not limited to the water-cooled type and may be an air-cooled type, and the number of cylinders of the engine is not limited to two cylinders, and may be a single cylinder or four cylinders. There are no restrictions on.

〔The invention's effect〕

According to the present invention described in detail above, even if the traveling speed of the motorcycle or the posture of the vehicle body changes, good ventilation around the cylinder can be maintained, and fluctuations in the ambient temperature of the carburetor can be suppressed to a minimum. , Stable engine performance can be obtained.

Moreover, it suffices to simply open a hole for attaching the duct unit on the side surface of the cowling body, and it is not necessary to integrally form an opening portion having a complicated shape on the side surface of the cowling body. Therefore, the shape and structure of the cowling main body can be simplified and the cowling main body can be easily manufactured, even though the exhaust port and the outside air introduction port are arranged on the left and right side surfaces of the cowling main body, respectively. You can

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a plan view around an engine, Fig. 2 is a side view of a duct unit, Fig. 3 is a sectional view of an outside air intake port, and Fig. 4 is a rear face of the duct unit. FIG. 5 and FIG. 5 are enlarged sectional views taken along the line VV in FIG.
The figure is a side view of the motorcycle. 8 ... Engine, 9 ... Cylinder, 10 ... Vaporizer, 13 ...
… Cowling, 15 …… Cowling main body (center cowl part), 16 …… Cooling air inlet, 18 …… First space, 19 ……
Second space, 20 ... Partition walls, 21a, 21b ... Sides, 22 ...
… Mounting hole, 23 …… Duct unit, 25 …… Exhaust port, 26
...... Outdoor air intake.

Claims (1)

[Claims] 1. An engine having an upright cylinder, a carburetor disposed behind the cylinder of the engine, left and right side surfaces that laterally cover the engine and the carburetor, and an opening in front of the engine. And a cowling main body made of synthetic resin having a cooling air inlet, and a partition wall is provided between the cylinder of the engine and the carburetor, and the partition wall is covered with the cowling main body. The space around the opened engine is located at the first position where the cylinder is located.
And a second space in which the carburetor is located, the cooling air inlet is connected to the first space, and mounting holes are formed on the left and right side surfaces of the cowling body.
A cowling device for a motorcycle, wherein a duct unit having an exhaust port connected to the first space and an outside air intake port connected to the second space is attached to the mounting hole.