JP2772968B2 - Radiator cooling system for motorcycles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a mechanism for promoting ventilation of a radiator of a motorcycle, that is, a wind guiding mechanism for promoting ventilation of cooling air passing through and cooling the radiator. In this case, the amount of cooling air to the radiator can be dramatically increased, and the cooling efficiency can be improved.

[Conventional technology]

In a motorcycle equipped with a water-cooled engine, a radiator is arranged in front of the engine, and a front side of the radiator is covered with a cowling. The cowling has an opening on its front surface for introducing a traveling wind to the radiator, and its left and right sides are extended to cover the side of the vehicle body.

The running wind passing through the front opening of the cowling flows backward between the left and right front forks and outside of both front forks, and blows through the radiator.However, because the left and right front forks are interposed in this air passage, , The air flow behind it is disturbed by the front fork, causing a vortex. Due to the vortex, the flow of the airflow passing between or outside the front forks toward the radiator is disturbed, and a smooth airflow is hindered. For this reason, the amount of traveling air flowing through the radiator decreases, and the cooling efficiency of the radiator decreases. The higher the traveling speed, the stronger this tendency.Therefore, in order to ensure a sufficient cooling effect in high output and high speed traveling, measures such as increasing the capacity of the radiator or increasing the front opening area of the cowling have been adopted. .

However, regarding the radiator capacity, cost reduction,
It is desirable to reduce the size as much as possible from the viewpoint of weight reduction, and it is desirable that the opening at the front surface of the cowling be as small as possible from the viewpoint of improving the design and improving the stability of the cowling.

[Problems to be solved by the invention]

The present invention contemplates a mechanism that promotes ventilation of the radiator so that the amount of traveling air passing through the radiator can be drastically increased irrespective of obstacles to the flow of the traveling wind caused by the left and right front forks. It is an object to improve the efficiency.

[Means for solving the problem]

Means taken to solve the above-mentioned problems are constituted by the following elements (a) to (c) on the premise of the above-mentioned conventional technology.

(A) a pair of left and right air introduction holes are provided in the cowling above the front opening of the cowling and below the headlights and outside the left and right front forks; Connect a wind guide duct that gradually changes so that the opening area becomes smaller toward the front end, curve the wind guide duct downward and inward, and
Projecting into a space surrounded by the rear surface of the radiator, the right and left sides of the cowling, and the front surface of the fuel tank; (c) the front end of the air guide duct is opened toward the cylinder head of the engine; That the running wind blown toward the cylinder head is released outside the vehicle body from the lower edge of the cowling.

[Action]

The traveling wind is introduced from the cowling front opening, passes through the radiator, and blows backward.

On the other hand, the traveling wind introduced from the air inlet holes provided on the left and right sides of the cowling outside the left and right front forks is located above the front opening of the cowling and below the headlight, and the rising heat of the headlights Without being thermally affected by the engine, the air is directed toward the engine cylinder head in the space surrounded by the back of the radiator, the left and right sides of the cowling, and the front of the fuel tank via the air duct connected to the air introduction hole. Blow out. Since the air guide duct is formed so as to gradually change so as to have a smaller opening area toward the tip, the blowing speed of the running wind is higher than the running wind speed to be introduced. On the other hand, the traveling wind passing through the radiator is decelerated due to the resistance of the radiator. Therefore, the flow velocity of the air blown out from the tip of the air guide duct is much higher than the traveling wind immediately after passing through the radiator. Then, the traveling wind blown from the tip of the air guide duct is blown toward the cylinder head of the engine, so that the traveling wind immediately after passing through the radiator crosses obliquely backward. For this reason, the traveling wind that has passed through the radiator is pulled backward by the airflow blown out from the baffle duct and accelerated, thereby increasing the amount of traveling wind that passes through the radiator (by a kind of fluid pump action). The air pressure (static pressure, the same applies hereinafter) immediately after passing through the radiator is reduced because the airflow blown from the air guide duct is pulled backward and accelerated. In addition, although the traveling wind passing through the radiator is heated and has a high temperature, the temperature of the air flow blown from the air guide duct to the space behind the left and right front forks and immediately after the radiator is low, so that the radiator is Immediately after passing, the traveling wind is cooled and the temperature decreases, and the air pressure decreases with the temperature decrease. Due to both of these phenomena, the air pressure of the airflow in the space surrounded by the back of the radiator, the right and left sides of the cowling, and the front of the fuel tank is significantly reduced, and the difference between the air pressure immediately before the radiator and the air pressure immediately after is increased. You. The traveling wind passing through the radiator is accelerated by the increased pressure difference, and the amount of air passing through the radiator is increased. Therefore, regardless of the disturbance of the traveling wind caused by the presence of the front fork, the amount of air passing through the radiator is increased, and the cooling efficiency of the radiator is significantly improved.

Further, the traveling wind blown downward from the air guide duct toward the cylinder head of the engine is released from the lower edge of the cowling to the outside of the vehicle body, so that heat does not accumulate in the space.

〔Example〕

 Next, embodiments will be described with reference to the drawings.

A main frame 3 and a down tube 4 extending rearward are connected to a head pipe 2 of a motorcycle 1,
Further, a pair of left and right front forks 6 on which the front wheels 5 are suspended are provided on the head pipe 2. On the other hand, a water-cooled engine 7 is mounted on the main frame 3 and the down tube 4. A radiator 8 for cooling the cooling water of the engine 7 by air is attached to the down tube 4.

The radiator 8 has a large number of fins, and the running wind passing between the fins cools the cooling water of the engine flowing through the narrow tubes of the radiator. The arrangement of the radiator, the manner of cooling the engine cooling water by the radiator, and the like are the same as the conventional one.

Front fender 15 between left and right front forks 6
There is a head pipe 2 from above the front fork 6
Around the radiator 8 and the fuel tank 9
To the bottom of the cowling 10
Two headlights 11 are provided on the front surface of 10. The cowling 10 has an opening 12 for opening the front of the radiator 8, and the traveling wind is introduced from the opening 12 to flow rearward so that the radiator blows through.

An air introduction hole 13 is provided above the opening 12 on the front surface of the cowling 10 and below the headlights 11, 11, and outside the left and right front forks 6, 6. The wind duct 14 is connected. The air guide duct 14 is curved downward and inward, and its tip projects into the space between the rear of the left and right front forks, the back of the radiator 8, the right and left sides of the cowling, and the front of the fuel tank. ing. The tip opening 14a is directed toward the cylinder head of the engine 7. The air guide duct 14 is tapered toward the front end, and the front end opening 14a is provided with the air introduction hole 13a.
Is much smaller than the opening area of

The running wind hitting the front of the motorcycle is introduced from the opening 12 on the front of the cowling, flows backward, and flows through the radiator 8.
The traveling wind introduced from the air introduction hole 13 passes through the air guide duct 14, behind the left and right front forks, and into the space behind the radiator 8 at a high speed toward the cylinder head of the engine 7. Be blown out.

The flow of the running wind is bent by the front fork to the left and right outside of the front fork, then turns inside again at the rear of the front fork and flows backward. The curvature of this air flow produces a vortex just behind the front fork, which entrains the surrounding air flow and produces a large turbulence. The turbulence of the air hinders a smooth air flow behind the front fork. However, in the space behind the front fork and behind the radiator, fresh air is blown at high speed from the tip opening 14a of the wind guide duct, and the blown fresh air is obliquely rearward toward the engine cylinder head. Flows. The hot air that has passed through the radiator is pulled and accelerated by the high-speed airflow. Therefore, regardless of the turbulence of the air flow due to the presence of the front fork, the amount of air passing through the radiator is significantly increased, and the cooling efficiency of the radiator is dramatically improved.

A carburetor 16 is connected to the engine, and further, an air cleaner 18 is connected to the carburetor via a connecting pipe 17, and this connecting pipe is connected to an end 17a on the carburetor 16 side as shown in FIG. Diameter D2 of the end 17b on the air cleaner 18 side
And a large-diameter portion 17c having a diameter D3 is provided near the air cleaner therebetween. Then, the relationship between these diameters is expressed as D3> D
2> D1, and the relationship between the lengths from the end 17a and the end 17b to the large diameter portion 17c is L2> L1. As a result, the amount of air taken in from the air cleaner 18 is increased, and the air is throttled and supplied to the carburetor 16 side, so that the supply pressure to the carburetor is also increased and the intake efficiency of the engine is improved.

〔The invention's effect〕

The maximum operation and effect of the present invention are as described in the section of [Operation]. That is, as described above, air introduction holes are provided on the left and right sides of the front surface of the cowling, and the air guide ducts connected to the air introduction holes are used to direct the rear of the left and right front forks and obliquely rearward into the space behind the radiator. Delivering fresh air at high speed significantly increases the amount of cooling air that blows through the radiator, dramatically increasing the cooling efficiency of the radiator, despite the fact that the left and right front forks hinder smooth running air flow. Can be improved.

In addition, the end of the air guide duct is open toward the engine cylinder head, and blows from the air guide duct to the back of the radiator and toward the radiator cylinder head. The cylinder head is directly cooled by the high-speed airflow blown from the tip. Thereby, the cooling load on the radiator is reduced, and the cooling performance of the engine is improved.

Further, the traveling wind blown toward the cylinder head of the engine is released from the lower edge of the cowling to the outside of the vehicle body, so that heat does not accumulate in the space.

Furthermore, the air introduction hole is located below the headlight above the front opening of the cowling, and is arranged outside the front fork, and the air guide duct connected to the air introduction hole is curved downward and inward. , The front end of which is open behind the left and right front forks and in the space behind the radiator, so that the air guide duct does not interfere with the headlights and the overall length is shortened to facilitate piping. In addition, it is possible to prevent the air guide duct provided below the headlight from being thermally affected by the rising heat of the headlight as described above.

Furthermore, since the air guide duct is curved downward from the front end to the rear end, the rainwater and car wash water that has entered the air guide duct quickly and completely flows out naturally, and these water remain in the air guide duct. Therefore, the inner surface of the air duct is not contaminated or corroded.

[Brief description of the drawings]

1 is a side view of a motorcycle, FIG. 2 is a front view, and FIG. 3 is a schematic view of an intake system. Explanation of reference numerals 6 ... front fork, 7 ... engine, 8 ... radiator, 10 ... cowling, 13 ... air introduction hole, 14 ...
duct.

Claims (1)

(57) [Claims] 1. A radiator for cooling water of an engine is disposed behind a pair of left and right front forks that suspend front wheels and above an engine, and extends from around a head pipe of a vehicle body to a side of the radiator and a cylinder head of the engine. There is an opening for covering the lower part of the fuel tank with a cowling, and for introducing a traveling wind to a radiator below a headlight provided on a front surface of the cowling. A motorcycle that flows rearwardly between the front forks and outside the front forks to blow through the radiator, wherein the motorcycle is positioned above the front opening of the cowling, below the headlights, Outside the fork, a pair of left and right air introduction holes are provided in the cowling, A wind guide duct that gradually changes so that the opening area decreases toward the end is connected, and the wind guide duct is bent downward and inward, and the rear portion is connected to the back of the radiator, the left and right sides of the cowling, and the fuel. The front end of the tank is projected into a space surrounded by the front surface of the tank.The end of the air guide duct is opened toward the cylinder head of the engine, and the traveling wind blown out toward the cylinder head of the engine from this opening is transmitted from the lower edge of the cowling. A cooling device for a radiator for a motorcycle, wherein the cooling device is discharged outside the vehicle body.