JPH0617676Y2 - Motorcycle engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cooling device for an air-cooled engine mounted between a front wheel and a rear wheel of a motorcycle.

[Prior Art] Conventionally, most of the air-cooled engines mounted on motorcycles are
A large number of cooling fins extending in the horizontal direction are provided on the surface, but the traveling wind that acts on this, that is, the wind from the front generated as the vehicle travels, is directed diagonally downward along the upper surface of the front wheels to the air-cooled engine. Due to collisions, they may not work effectively on the cooling fins.

For this reason, for example, as disclosed in Japanese Utility Model Laid-Open No. 50-131437, there is a front fender provided with a guide plate on the lower rear surface thereof to guide the traveling wind to an air-cooled engine.

[Problems to be solved by the invention] By the way, since the guide plate is provided on the front fender, the guide plate moves left and right due to the steering of the front wheels, and it is not possible to always guide the traveling wind to the cooling engine. Also,
Because there is a wide space between the induction plate and the air-cooled engine,
The traveling wind guided by the guide plate may be disturbed and may not act effectively on the cooling fins.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling device for an air-cooled engine that can constantly rectify and guide the air to the cooling fins of the air-cooled engine without disturbing the traveling wind.

[Means for Solving the Problems] In order to solve the above problems, an engine cooling device for a motorcycle according to the present invention is a lower part of an air-cooled engine having cooling fins on a cylinder outer wall mounted between a front wheel and a rear wheel. The front surface is covered with a flow control cowl, and a horizontal turning surface that connects to the lower side of the cylinder of the engine is formed on the upper part of the flow controlling cowl. The direction of the turning surface is substantially the same as that of the cooling fins. The rear end near the center is extended to the vicinity of the front end of the cooling fin in the lower part of the cylinder so as to cover the forward projection of the exhaust pipe from above, and both sides of the turning surface in front view extend to the side wall surface of the cylinder. It is characterized in that it extends to the vicinity of the wraparound cooling fins.

[Operation] According to the present invention, even if the front wheels are steered left and right, the traveling wind that descends obliquely downward along the front wheels can be always guided to the cooling fins of the air-cooled engine by the turning surface of the flow control cowl. .

Moreover, the direction of the turning surface of the rectifying cowl is substantially the same as that of the cooling fins, and the rear end of the turning surface near the center of the front view extends to the vicinity of the front end of the cooling fins in the lower part of the cylinder. The diagonally downward running wind,
The turning surface can effectively guide the cooling fins on the outer wall of the cylinder.

Also, by covering the forward projection of the exhaust pipe from above in the vicinity of the center of the turning surface when viewed from the front, the hot air around the exhaust pipe is not raised to the cylinder side. On the other hand, the temperature of the cylinder is lowered and the filling efficiency is improved.

In addition, both sides of the turning surface of the straightening cowl when viewed from the front extend to the side wall surface of the cylinder and extend to the vicinity of the cooling fins. Can lead to.

[Embodiment] Hereinafter, the present invention will be described with reference to an illustrated embodiment. First
FIG. 1 is a side view of the motorcycle, and FIG. 2 is an enlarged external view showing an engine cooling device of the motorcycle.

In the figure, reference numeral 1 is a motorcycle, and a body frame 2 thereof has a front wheel 3
The air-cooled engine 5 is mounted between the rear wheel 4 and the rear wheel 4. 6 is a fairing installed above the front part of the vehicle body frame 2, 7 is a rectifying cowl provided in the lower part, and 8 is a fuel tank.

As shown in FIG. 2, the flow control cowl 7 is supported by the down tube 2a that constitutes the vehicle body frame 2 and is made of synthetic resin. Reference numeral 2b is a mounting bolt for mounting the rectifying cowl 7 on the vehicle body frame 2. The rectification cowl 7 covers the lower front surface of the air-cooled engine 5 having a cooling fin 5a on the outer wall of the cylinder, and the air-cooled engine 5 is provided on the upper part of the rectification cowl 7.
Forming a horizontal turning surface 7a continuous to the lower side of the cylinder, the turning surface 7a having a surface direction substantially the same as that of the cooling fins 5a, and a rear end 7b of the turning surface 7a near the center in the front view.
Is extended to the vicinity of the front end of the cooling fin 5a in the lower portion of the cylinder so as to cover the forward protruding portion 9a of the exhaust pipe 9 from above, and the both side portions 7c of the turning surface 7a when viewed from the front wrap around to the side wall surface of the cylinder for cooling. It extends to the vicinity of the fin 5a. Arrows W1 and W2 indicate the flow direction of traveling wind.

Therefore, when the vehicle travels, even if the front wheels 3 steer left and right, the traveling wind W that descends diagonally downward along the front wheels 3.
1 can always be guided to the cooling fins 5a of the air-cooled engine 5 by the turning surface 7a of the flow control cowl 7.

Moreover, the direction of the turning surface 7a of the flow control cowl 7 is substantially the same as that of the cooling fins 5a, and the rear end 7b of the turning surface 7 near the center of the forward direction extends to the vicinity of the front end of the cooling fins 5a in the lower portion of the cylinder. Therefore, the traveling wind W1 that descends obliquely downward along the front wheels 3 can be effectively guided to the cooling fins 5a on the outer wall of the cylinder by the turning surface 7a.

Further, by covering the forward protruding portion 9a of the exhaust pipe 9 from above in the vicinity of the center of the turning surface 7a of the rectifying cowl 7 when viewed from the front, the hot air around the exhaust pipe 9 does not rise to the cylinder side, which improves engine performance. It can cool against the heat of the cylinder, which has the most influence, and the temperature of the cylinder is lowered to improve the filling efficiency.

Further, both side portions 7c of the turning surface 7a of the rectifying cowl 7 when viewed from the front wrap around to the side wall surface of the cylinder and extend to the vicinity of the cooling fins 5a, and the traveling wind W2 that wraps around the left and right sides of the front wheel 3 also. It can be effectively guided to the cooling fins 5a on the outer wall of the cylinder.

[Effects of the Invention] As described above, this invention always cools the air-cooled engine with the turning surface of the rectifying cowl, even when the front wheels are steered left and right, the running wind that descends diagonally downward along the front wheels. Can lead to fins.

Moreover, since the direction of the turning surface of the flow control cowl is substantially the same as that of the cooling fin, and the rear end of the turning surface near the center in the front view is extended to the vicinity of the front end of the cooling fin at the lower part of the cylinder. The running wind that descends diagonally downward,
The turning surface can effectively guide the cooling fins on the outer wall of the cylinder.

Also, by covering the forward projection of the exhaust pipe from above in the vicinity of the center of the turning surface of the rectifying cowl when viewed from the front, the hot air around the exhaust pipe is not raised to the cylinder side, so the cylinder that most affects engine performance Can be cooled by the heat of the cylinder, the temperature of the cylinder is lowered, and the filling efficiency is improved.

Also, since both sides of the turning surface of the rectifying cowl when viewed from the front are extended to the side wall of the cylinder and extended to the vicinity of the cooling fins, the traveling wind that passes around both the left and right sides of the front wheels is also cooled by the cooling fins on the outer wall of the cylinder. It can guide effectively and the engine can be cooled well.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show one embodiment of the present invention. FIG. 1 is a side view of a motorcycle, and FIG. 2 is an enlarged external view showing an engine cooling device of the motorcycle. 5 ... Engine, 5a ... Cooling fin 7 ... Commutation cowl, 7a ... Turning surface 9 ... Exhaust pipe

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A front surface of a lower portion of an air-cooled engine having cooling fins on the outer wall of a cylinder mounted between a front wheel and a rear wheel is covered with a rectifying cowl, and the upper portion of the rectifying cowl is connected to a lower portion of a cylinder in a horizontal direction. The surface of the turning surface is substantially the same as that of the cooling fins, and the rear end of the turning surface near the center in the front view covers the lower part of the cylinder so as to cover the forward projection of the exhaust pipe from above. The engine cooling device for a motorcycle, wherein the cooling fin extends to near the front end of the cooling fin, and both sides of the turning surface when viewed from the front extend to the side wall surface of the cylinder and extend to near the cooling fin.