JPS6357384A - Cowling device for motorcycle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cowling Hfi for a motorcycle.

[Prior art]

Conventionally, in motorcycles where the engine cylinder is tilted significantly forward and the carburetor or air cleaner is placed above the cylinder, the air cleaner is located immediately after the radial vibration to the steering wheel, so the air cleaner is surrounded by a fuel tank or a fuel tank. It is covered with a forming cover.

Also known in this type of motorcycle is one in which the area from the front of the steering head pipe to both left and right sides of the engine is integrally covered with a cowling.

(Problem to be Solved by the Invention) By the way, according to this vehicle body configuration, the space in which the air cleaner is accommodated and the space surrounded by the cowling overlap vertically and communicate with each other. The hot air flows into the area around the air cleaner, raising the ambient temperature at the air cleaner inlet.This causes the intake air temperature to rise, lowering the intake air filling efficiency, and causing negative effects on engine output. Problems arise.

[Means for solving problems]

Therefore, in the present invention, an outside air intake port is provided on the front surface of the cowling, and the outside air that flows in from the outside air intake port along the inside surface of the cowling is guided to the rear of the rad vibrator and to the steering wheel through the side of the front fork. It is characterized by the formation of a wind path.

[Effect]

According to this configuration, while driving, fresh outside air taken into the cowling from the outside air intake is forcibly guided around the intake port through the air guide path, so the intake air is located at a position where hot engine air can easily flow into the cowling. The ambient temperature around the mouth can be kept low.

Therefore, it is possible to prevent the temperature of the intake air from increasing, and the filling efficiency of the intake air is improved.

Moreover, the air guide path is installed in the dead space inside the cowling, so it does not impede the rotation of the front fork in any way, and the air guide path is not visible from the outside. It is also convenient in terms of

[Embodiments of the invention]

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

Reference number 1 in FIG. 1 is a frame, and a front fork 3 is pivotally supported on a steering head pipe (hereinafter referred to as radvib) 2 placed vertically at the front end of the frame. A pair of left and right main vibes 4 and a down tube 5 extending rearward are welded to the head vibe 2, and a water-cooled engine 7 is mounted between the main vibe 4 and the down tube 5. Cylinder 8 of water-cooled engine 7
is tilted significantly forward, and a downdraft type carburetor 9 and an air cleaner 10 are arranged above the cylinder 8. The air cleaner 10 is disposed between the front ends of the main vibe 4 and immediately behind the head vibe 2, and an intake air inlet 11 that opens rearward is provided on the top surface of the air cleaner 10. .

A fuel tank 12 is installed on the main vibe 4, and the upper part of the air cleaner 10 is crowded into a recess 13 formed at the bottom of the front half of the fuel tank 12.
A suction port 11 is opened in 3. Further, the front ends of the main vibe 4 and the down tube 5 are connected by a member 6 extending in the front-rear direction, and these members 6, the main vibe 4, and the down tube 5 open on both front sides of the recess 13. A space 14 having a substantially triangular shape in side view is formed.

Note that a radiator 15 is attached to the front surface of the upper end of the down tube 5.

Incidentally, a cowling 16 of FRP II is fixed to the frame 1. The cowling 16 of this embodiment is
Upper cowl part 1 that covers the upper front part of the front fork 3
7, and an under cowl part 18 that is continuous with the upper cowl part 17 and covers the water-cooled engine 7 from both left and right sides to the bottom. 15 are arranged. The under cowl part 18 is bolted to the main vibe 4 and the down tube 5, and the upper cowl part 11 is bolted to a support stay 25 extending forward from the head vibe 2, on both left and right sides of the support stay 25. The upper cowl part 17 and the under cowl part 18 are collinear with the arm part 25a extending rearward from the upper cowl part 17.

Note that the support stay 25 supports not only the upper cowl portion 17 but also a headlamp 26 and a meter unit (not shown).

An exhaust port 20 is provided on the side surface of the under cowl portion 18 to release hot air that has passed through the radiator 15 to the outside of the cowling 16.
Intake ports 21 for taking outside air (running II) into the inside of the under cowl part 18 are opened vertically, and hot air from the radiator 15 flows into the under cowl part 15 and the water-cooled engine. A heat shield 122 is installed to prevent the heat from blowing out toward the driver through the gap between the heat shield and the heat shield 7. The heat shield wall 22 passes behind the opening position of the exhaust port 20 and extends in the vertical direction.
An extension wall 23 extending toward the top of the maggot 15 is integrally formed at the upper end thereof.

Note that an air guide duct 24 extending forward is attached to the outer peripheral portion of the radiator 15, and an upper surface 24a of this air guide duct 24 is provided continuously to the extension wall 23.

On the other hand, a side surface 17a of the upper cowl portion 17 extends to the side of the front end of the main vibe 4 through the side of the front fork 3, and a grip portion 2B of the bar handle 27 is provided in front of the side surface 17a. A protector 29 is provided to cover the front of the. This protector 29 is bolted to the side surface 17a of the upper cowl portion 17 in an overlapping state, and protrudes laterally beyond the side surface 17a as it moves toward the grip portion 28 side. Therefore, the inner surface of the protector 29 and the side surface 17a of the upper cowl portion 17
A space 30 that opens rearward is formed between the two.

An outside air intake port 31 that opens toward the front is formed at the front end of the protector 29.
1 communicates with a space 30 inside the protector 29. Furthermore, as shown in FIG. 4, a communication hole 32 opening into the space 3o is formed in the side surface 17a of the upper cowl portion 17, and the communication hole 32 is located immediately after the outside air intake port 31. A communication hole 3 is provided on the inner surface of the protector 29.
A partition wall 33 that abuts the side surface 17a and impairs the rear opening of the space 30 at the rear of the opening position of No. 2;
is protruding from the outside air intake port 3. Therefore, while driving, the outside air intake
The outside air (driving wind) that has flowed into the space 30 from the fourth
As shown by the arrow in the figure, the flow direction is changed to the communication hole 32 side by colliding with the partition wall 33, and flows into the inside of the upper cowl part 17 through the communication hole 32.

An inner panel 35 extending in the front-rear direction is attached to the inside of the side surface 17a of the upper cowl portion 17.

As shown in FIG. 5, the inner panel 35 includes a bracket 36 welded to the support stay 25 and the arm portion 25a.
It is bolted to the top, and its front end is connected to the communication hole 3.
2, and the rear end reaches the front end of the fuel tank 12. In addition, inner panel 3
The outer edge of 5 is in contact with the inner surface of the upper cowl part 17, and fills the gap between the fuel tank 12 and the meter unit, and connects the wire harness, support stay 25, etc. that runs inside the upper cowl part 17 from above. It's covered up.

The inner panel 35 is connected to the communication hole 32 by the lower surface 35a and the inner surface of the upper cowl portion 11.
An air guide path 37 is formed that guides the outside air flowing in from the frame 1 toward the rear. It reaches to the sides.

In the case of this embodiment, the upper surface 24a and the extension M123 of the air guide duct 24 are provided below the inner panel 35 to face each other.
3 constitutes the bottom wall of the air guide path 37.

According to such a configuration, while driving, the outside air taken in from the outside air intake port 31 of the protector 29 flows from the space 30 through the communication hole 32 to the front end of the air guide path 37, and from there flows to the lower surface of the inner panel 35. It is guided rearward along the inside of the air guide path 37. In this case, the upper surface 24a of the air guide duct 24 and the extension wall 23 located below the inner panel 35
Since it forms the bottom surface of the air guide path 37, the outside air introduced into the air guide path 37 is prevented from escaping downward, and most of this outside air is guided toward the air 1!114 at the front end of the frame 1. become.

Since this air 1i 114 is located in front of the recess 13 into which the air cleaner 10 enters, fresh outside air from the outside air intake port 31 is introduced into the recess 13 where the suction port 11 opens. The suction port 11 is located at a position where hot air from the water-cooled engine 7 and the radiator 15 can easily flow into it.
can keep the ambient temperature low.

Therefore, an increase in intake air temperature can be prevented, the filling efficiency of intake air can be improved, and engine output can be increased.

Furthermore, since the si path 37 is provided along the inner surface of the upper cowl portion 17, the dead space within the upper cowl portion 17 is utilized. Therefore, the rotation of the front fork 3 is not hindered in any way, the steering angle does not become small, and the air guide path 31 is not visible from the outside, which is convenient in terms of appearance. .

Furthermore, the outside air taken in through the outside air intake port 31 collides with the partition wall 33 to change its flow direction, and then is introduced into the inside of the upper cowl portion 17. It flows into the upper cowl part 17 while dropping. For this reason, even though a hole was originally made in the upper cowl part 17 that acts as a windbreak for the driver, outside air does not blow out to the driver's side, and the cowling 1
6 functions remain intact.

Furthermore, in the case of this embodiment, since the air guide path 37 is originally constructed using the inner panel 35 that covers the inside of the upper cowl portion 17, a special member for forming the air guide path 37 is not required. Therefore, the number of parts does not increase, and the structure is simple and can be provided at low cost.

In the above-described embodiment, the air cleaner is housed in the recess of the fuel tank, but the present invention is not limited to this. For example, the fuel tank may be installed behind the air cleaner, and
The fuel tank and air cleaner may be covered with a cover that forms the fuel tank, or the air cleaner may be omitted and the intake passage of the carburetor may be opened directly behind the head vibrator.

Further, the outside air inlet is not limited to being provided in the protector, and may be opened at a position away from the protector, for example.

〔Effect of the invention〕

According to the present invention described in detail above, the fresh outside air taken into the cowling from the outside air intake port is forcibly guided around the suction port, so that hot air from the engine tends to flow around the suction port. However, the intake air temperature can be kept low, the intake air filling efficiency can be improved, and the engine output can be increased.

In addition, since the air guide path is located in the dead space inside the cowling, it does not interfere with the rotation of the front fork, and the air guide path is not visible from the outside, which is convenient in terms of appearance. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the motorcycle, FIG. 2 is a front view of the motorcycle, FIG. 3 is a plan view of the motorcycle, and FIG. FIG. 5 is a sectional view taken along line -■ and a side view showing the positional relationship between the air guide path and the air cleaner. 2...Steering head vibe, 3-...Front fork, 7...Engine, 11...Intake port, 12
...fuel tank, 16...cowling, 31...
Outside air intake, 37... air guide path. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A suction port for intake air of the engine is provided behind the steering head pipe that pivotally supports the front fork, and this suction port is covered with a fuel tank or a cover forming a fuel tank, and the upper part of the front fork is covered with a fuel tank or a cover forming a fuel tank. In a motorcycle in which a cowling covers at least the upper side of the engine from the front, an outside air intake is provided at the front of the cowling, and the outside air flowing from the outside air intake along the inside surface of the cowling is directed to the front fork. A cowling device for a motorcycle, characterized in that an air guide path is formed to guide the air to the rear of a steering head pipe through the side of the cowling.