JPH0210071Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motorcycle with a cowling.

[Prior Art] In a motorcycle, a cowling is provided to cover the periphery of the engine, and the engine is cooled by drawing wind from the front into the cowling.

[Problem that the invention aims to solve] Incidentally, since turbulence in the running wind occurs behind the front wheels, this creates aerodynamic resistance during running, and also hinders the intake of running air into the cowling for engine cooling. .

In addition, if the exhaust pipe is placed in the longitudinal direction of the vehicle using the space below the engine, and this exhaust pipe is also covered by the bottom of the cowling, the turbulence of the running wind behind the front wheels will cause cooling to the exhaust pipe side. Therefore, it is difficult to take in the wind while driving.Conversely, to make it easier to take in the wind while driving, if the left and right width of the bottom of the cowling is increased and the front is opened, the left and right width of the bottom of the car body becomes larger, making it easier to drive with the car body tilted. The bank angle when doing so becomes smaller.

Therefore, the purpose of this invention was to suppress the turbulence of the running wind behind the front wheels with a cowling, reduce aerodynamic resistance during running, guide the running wind toward the engine, and effectively direct the running wind to the exhaust pipe located below the engine. To provide a motorcycle with a cowling, which allows the intake of running wind and makes the left-right width of the bottom of the vehicle body more compact by bringing the cowling close to an exhaust pipe.

[Means for Solving the Problems] In order to achieve the above problems, the present invention has a front wheel located in front of the engine, an exhaust pipe arranged below the engine along the longitudinal direction of the vehicle body, and at least a portion below the exhaust pipe. and a motorcycle equipped with an under cowling that covers both sides, the front end of the under cowling being close to the rear part of the front wheel, and the front end of the under cowling having a bending part around the inside of the vehicle body. , forming a running wind intake that guides running wind toward the engine side, and forming both side surfaces of the under cowling in a shape that gradually expands outward from the bent portion toward the rear of the vehicle body; The vehicle is characterized in that a traveling wind intake is formed in the front portion of the vehicle for guiding traveling wind toward the exhaust pipe.

[Function] The front end of the undercowling, which is close to the rear of the front wheels, is bent inward of the vehicle body, suppressing disturbances in the running wind behind the front wheels, reducing aerodynamic drag,
Running wind is guided toward the engine through the intake port that has this bent portion around it.

In addition, air is guided to the exhaust pipe side below the engine by the intake holes formed at the front of both sides of the under cowling, which gradually expands outward from the bent part toward the rear of the vehicle body. Since the inner surface of the under cowling is also cooled, it is possible to bring the under cowling closer to the exhaust pipe, making it possible to make the left and right width of the bottom of the vehicle more compact.

[Example] Examples will be described below based on the accompanying drawings.

1 and 2 showing a motorcycle 1 with a cowling to which the present invention is applied, a body frame 2
These include a head pipe 3 at the front end, a pair of left and right main pipes 4, a down pipe 5, a lower pipe 6, a center pipe 7, a seat pipe 8 and a rear pipe 9.
Consists of etc. A front fork 13 supporting a front wheel 11 and having a handle 12 is supported by a head pipe 3 in a freely steerable manner, and a rear fork 15 supporting a rear wheel 14 is pivotally supported by a center pipe 7.

In the space formed by the main pipe 4, down pipe 5, lower pipe 6 and center pipe 7,
In the embodiment, a water-cooled three-cylinder two-stroke engine 23 that is V-shaped in side view and has two front cylinders 21, 21 on the left and right and one rear cylinder 22 in the center is mounted, and a radiator 24 is disposed in front of the upper part of the down pipe 5. . Further, a fuel tank 25 is arranged on the main pipe 4, a seat 26 is arranged on the seat pipe 8, 27 indicates a front fender, 28
is the rear cowling that extends to the side cover section.

As shown in FIG. 3, three carburetors 31, 31, 31 are arranged in series in the vehicle width direction above the front cylinders 21, 21,
Further, as shown in FIGS. 4 and 5, the exhaust pipes 32, 32 connected to the front cylinders extend downward and then extend along the rear side below the engine 23 from the curved portions 32a, 32a facing outward in the vehicle width. It extends. 33 is an expansion chamber at the middle of the exhaust pipe 32, 34 is a muffler at the rear end of the exhaust pipe 32, and 35 is the center line of the vehicle width. Furthermore, an exhaust pipe 36 connected to the rear cylinder 22 extends rearward, 37 is an expansion chamber in the middle of the exhaust pipe 36, 38 is a thermostat, and 39 is an ignition coil.

The above motorcycle 1 includes an engine 23, a front radiator 24, lower exhaust pipes 32, 32, and a front cowling 41 that covers the front of the handlebar 12.
A large running air intake 42 is opened at the front of the vehicle, and an air exhaust port 43 is opened at the rear end. 44 is a side stand cover provided facing the outside of the expansion chamber 33 of the exhaust pipe 32.

The front cowling 41 of the embodiment is composed of a divided body of an upper cowling 46 and an under cowling 47, and an exhaust port 51 located on the rear extension line of the radiator 24 is formed on the side of the upper cowling 46. parka ring 46
This is an exhaust air guide section with the side portions bulging outward.

In addition, a traveling wind intake 61 is formed in a portion of the upper side of the under cowling 47 facing the outside of the front cylinder 21, and 62 is a traveling wind introduction guide portion in which the upper side of the under cowling 47 bulges outward. , 63 is a front inner guide piece, and 64 is a rear outer guide piece. A running wind introduction guide center line 62a of the guide portion 62 is inclined upward toward the rear.

A front end portion 48 of the under cowling 47 is formed in a shape corresponding to the outline of the front wheel 11 in close proximity to the rear portion of the front wheel 11, and a bent portion 48a toward the inside of the vehicle body is formed around the front end portion 48 of the under cowling 47, and is bent upwardly. The running wind intake 42 is open.

Further, the bottom side surfaces 49, 49 of the under cowling 47, which cover the outside and the bottom of the exhaust pipes 32, 32 below the engine 23, are formed in a shape that gradually expands outward from the bent portion 48a toward the rear of the vehicle body. , the exhaust pipe curved portions 32a, 32a are located at the front of the bottom side surfaces 49, 49 of the under cowling 47.
Traveling wind intakes 71, 71 are formed in the portion facing outward. This running wind intake 71 is provided with a running wind introduction guide part 72 in which the bottom side surface 49 of the under cowling bulges outward, and the exhaust pipe curved part 32a faces inside this running wind introduction guide part 72. The traveling wind introduction guide center line 72a of the guide portion 72 is substantially horizontal, and the traveling wind introduction guide center line 62a of the guide portion 62 intersects with its forward extension.

Since the front cowling 41 is provided as described above, the radiator 24 and the front are affected by the running wind that enters the front cowling 41 as shown by arrow A in FIG. The cylinders 21, 21 are cooled, and warm air is discharged from the exhaust port 51 to the outside of the upper cowling 46 while being guided by the guide portion 52 behind them.

Further, from the running air intake 61 on the upper side of the under cowling 47, the guide portion 6
2, that is, the guide pieces 63 and 64 at the front and rear ends.
The rear cylinder 22 and the exhaust pipe 36 are caused by the wind that enters the upper part of the under cowling 47.
The expansion chamber 37 is cooled, and the exhaust port 4
Warm air is discharged from 3 along the rear.

The turbulence of the running wind behind the front wheels 11 is suppressed by a bent portion 48a formed in the front end portion 48 of the under cowling provided close to the rear of the front wheels 11, which bends toward the inside of the vehicle body. While reducing aerodynamic drag, the engine 2 is
The wind is guided to the 3rd side.

Further, a running wind intake 7 is formed at the front of both side surfaces 49 of the bottom of the under cowling, which gradually expands outward from the bent portion 48a toward the rear of the vehicle body.
1,71 to the guide part 7 as shown by arrow C in FIG.
The exhaust pipes 32, 32 and the expansion chambers 33, 33 are cooled along the rear side of the curved portions 32a, 32a below the engine 23 by the traveling wind that is guided by the engine 23 and enters the bottom of the under cowling 47. Warm air is discharged from the exhaust port 43 along the rear side. At this time, not only the exhaust pipe 32 but also the bottom inner surface of the under cowling 47 is cooled.
As in the embodiment, the under cowling bottom side surface 49 can be brought close to the exhaust pipe 32, that is, the left and right width of the bottom of the vehicle body can be made compact.

[Effects of the invention] As described above, according to the motorcycle with a cowling of the present invention, the turbulence of the running wind behind the front wheel is suppressed by the bent part of the front end of the undercowling inward of the vehicle body, which is located immediately behind the front wheel. It is possible to reduce aerodynamic drag by guiding running air toward the engine through the intake port that has a bend around it, and also to reduce aerodynamic drag. The intake port formed in the part guides the running wind to the exhaust pipe side below the engine,
It can cool the exhaust pipe and the inner surface of the under cowling.
Therefore, both side surfaces of the under cowling can be brought close to the exhaust pipe, and the left-right width of the bottom of the vehicle body can be made compact.

[Brief explanation of drawings]

Figure 1 is a front view of a motorcycle with a cowling to which the present invention is applied, Figure 2 is a side view of the same, and Figure 3 is a front view of a motorcycle with a cowling to which the present invention is applied.
FIG. 4 is a cross-sectional view taken along the line shown in FIG. 2, and FIG. 5 is a cutaway side view of the exhaust pipe portion of the cowling. In the drawings, 1 is a motorcycle, 2 is a body frame, 11 is a wheel, 23 is an engine, 32 is an exhaust pipe, 41 is a front cowling, 42 is a running wind intake in front of the front cowling, 47 is an under cowling, 48 48a is the bent portion, 49 is the bottom side surface of the under cowling, and 71 is the air intake.

Claims (1)

[Scope of Claim for Utility Model Registration] A motorcycle in which a front wheel is located in front of the engine, an exhaust pipe is arranged below the engine along the longitudinal direction of the vehicle body, and is provided with an under cowling that covers at least the bottom and both sides of the exhaust pipe. The front end of the under cowling is located close to the rear part of the front wheel, and the front end of the under cowling has a bending part toward the inside of the vehicle body around the front end, so as to provide a running wind vent that guides running wind toward the engine side. In addition to forming an inlet, both side surfaces of the under cowling are formed in a shape that gradually expands outward from the bent portion toward the rear of the vehicle body, and the front portions of both side surfaces of the under cowling are configured to direct running air toward the exhaust pipe side. A motorcycle with a cowling, characterized in that a running air intake is formed to guide the running air.