JPH0217144Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a radiator fan control device for a two-wheeled motor vehicle equipped with a water-cooled engine.

(Prior technology) Motorcycles have a typical layout, with a main frame constructed in the center, a steering front wheel and a driving rear wheel placed in front and behind each other, and an engine housed within the main frame. Equipped with a fuel tank at the top of the main frame,
A seat is placed behind it, and those equipped with a water-cooled engine are constructed with a radiator placed at the front of the main frame. And for large water-cooled engines,
To improve cooling performance, a fan is placed behind the radiator to forcefully blow air. The carburetor is usually located behind the engine cylinder, below the bottom of the fuel tank.

In a motorcycle having such a configuration, air heated by heat exchange through the radiator flows rearward and is likely to hit the carburetor or the legs of a rider who is straddling the seat.

When a motorcycle is running at a certain speed, strong running air is introduced from places other than the radiator and the hot air is diffused, but when the motorcycle is running at low speeds or stopped, the above-mentioned ventilation fan is working. The problem with this is that the hot air directly hits the carburetor and causes thermal damage such as paper lock and percolation, which causes the carburetor to malfunction, and also causes the driver's legs to become hot and uncomfortable. be.

(Problem that the invention aims to solve) This invention was made in view of the above-mentioned problems.When the vehicle is stopped or driving at low speed, there is little wind while driving, but the engine is hot and requires cooling. To provide a radiator fan control device for a motorcycle that prevents heat damage and discomfort by preventing air heated by heat exchange from hitting the carburetor or the driver's legs when the fan is activated to drive the vehicle. The purpose is to

[Structure of the idea]

(Means for Solving the Problems) For this purpose, the radiator fan control device for a motorcycle of this invention has a main frame built in the center, which has a front wheel that can be steered, and a front wheel that is driven by an engine. A water-cooled engine is mounted in the main frame, a fuel tank is placed at the top of the main frame, a seat for the rider is placed behind it, and a radiator is placed in front of the water-cooled engine and at the front of the main frame. In a two-wheeled motor vehicle with a carburetor located behind the radiator, a fan drive control relay is installed to control the forward and reverse rotation of the blower fan behind the radiator, and this fan drive control relay is used to control engine cooling water temperature. When the engine cooling water temperature is higher than the set value and the vehicle speed reaches the set value or less, the blower fan is controlled by a thermo sensor that detects the vehicle speed and a speed sensor that detects the vehicle speed. The configuration is such that the speed is increased and reversed to obtain the desired wind speed, and the fan is rotated forward in the high-speed driving range while the vehicle speed exceeds the set value.

(Function) Therefore, even when stopped or driving at low speed, if the engine is hot and needs cooling water, the blower fan will reverse and supply cooling air to the front of the radiator. . As a result, the heated air is radiated forward, so it does not hit the carburetor or the rider's legs.

In this case, since the opposing running wind is small, a sufficient amount of air necessary for cooling can be obtained even in reverse rotation.

When the vehicle speed increases, there is a large amount of oncoming airflow, and reverse rotation is useless, so the blower fan rotates forward to assist the airflow. In this case, hot air flows toward the carburetor and the rider's legs, but a large amount of running wind flows in from places other than the radiator and diffuses the heated air, so there is no risk of heat damage.

(Example) Hereinafter, a description will be given with reference to figures showing an example of this invention.

FIG. 2 is a side view of a two-wheeled motor vehicle equipped with a V-type water-cooled engine. The V-type water-cooled engine 4 is mounted on the main frame 2 constructed in the center, and front and rear wheels 11 are steered by a handlebar 10. The main frame 2 has a rear wheel 12 driven by the engine 4, a fuel tank 13 at the top of the main frame 2, a seat 14 behind it, and a radiator 1 at the front.

In order to improve the cooling performance of the engine 4, a blower fan 3 is attached behind the radiator 1 to forcefully blow air. Also, carburetor 5 is V
It is located between the molds and below the bottom of the fuel tank 13.

A fan drive control relay 7 is connected to the drive power supply circuit 6 of the blower fan 3, so that the blower fan 3 can be switched between normal rotation and reverse rotation.

The fan drive control relay 7 is operated by the output signal of the conventionally installed thermosensor 8 for detecting the temperature of engine cooling water and the output signal of the speed sensor 9 for detecting the vehicle speed. Controls forward and reverse rotation.

That is, when the engine cooling water temperature reaches a set value, the blower fan 3 is driven, but the direction of rotation is controlled to vary depending on the vehicle speed at that time. From stopped (vehicle speed 0 km/h) to low speed driving (vehicle speed 15~
20km/h), the blower fan 3 rotates in reverse and the cooling air flows forward and passes through the radiator 1. When the vehicle speed exceeds this, the blower fan 3 rotates in the normal direction and the cooling air flows backwards. It is designed to pass through the radiator 1.

During reverse rotation, the rotation of the blower fan 3 is increased to a certain extent so that the traveling speed becomes higher than the vehicle speed.
Furthermore, when converting between reverse rotation and forward rotation, hysteresis or delay time is set to avoid harsh operating conditions of the fan motor.

In this way, when the vehicle is stationary or at low speed, the radiator ventilation is cooled by the push type, and the air whose temperature has increased due to heat exchange is released and diffused forward and does not hit the carburetor 5 or the driver's legs, so the paper lock, park, etc. There is no possibility of heat damage to the carburetor such as collation or discomfort to the driver.
When driving at medium or high speeds, strong wind hits the vehicle, so the load on the blower fan 3 is reduced by rotating it in the normal direction. In this case, hot air will hit the carburetor 5, etc., but strong running air flows in from a place other than the radiator 1 and diffuses the hot air, so there is no risk of heat damage.

Since the above-mentioned reversal of the blower fan 3 is performed below a low speed range and the running wind is weak, a sufficient amount of radiator airflow can be obtained by simply increasing the blowing speed a little. Existing thermosensors and speed sensors can be used, making it possible to prevent driver discomfort caused by heat damage to the carburetor without incurring a significant increase in costs.

[Effect of idea]

As described above, the radiator fan control device for a motorcycle according to this invention is equipped with a water-cooled engine, a radiator that circulates and cools the engine's cooling water is placed at the front of the vehicle body, and a blower fan is attached behind the radiator. In addition, in motorcycles where the carburetor or rider's legs are in contact with the ventilation air of the radiator, the drive of the ventilation fan is controlled by a thermosensor that detects the engine coolant temperature and a speed sensor that detects the vehicle speed. However, when the temperature exceeds the set temperature, the fan is activated, but when the vehicle is stopped or driving at low speed, the speed is slightly increased and the fan is driven in reverse, and when driving at high speed, it is rotated in the forward direction. This prevents hot air from heating the carburetor and driver's legs, maintains engine performance, and improves rider comfort.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the arrangement of a radiator fan control device according to an embodiment of this invention, and FIG. 2 is a side view of a two-wheeled motor vehicle suitable for being equipped with this invention. 1...Radiator, 2...Main frame, 3...Blower fan, 4...Water-cooled engine, 5...Carburetor, 7...Fin drive control relay, 8...Thermo sensor, 9...Vehicle speed sensor, 11... ...Front wheel, 1...
...Rear wheel, 13...Fuel tank, 14...Seat.

Claims (1)

[Scope of utility model registration request] A front wheel that can be steered and a rear wheel that is driven by an engine are placed in front and behind the main frame built in the center, with a water-cooled engine mounted inside the main frame, a fuel tank at the top of the main frame, and a rear wheel behind it. In a motorcycle that has a seat for the rider to straddle, a radiator in front of the water-cooled engine and the front of the main frame, and a carburetor behind the radiator, the blower fan behind the radiator can be rotated in the forward or reverse direction. A fan drive control relay is provided, and this fan drive control relay is controlled by a thermosensor that detects the engine coolant temperature and a speed sensor that detects the vehicle speed.When the engine coolant temperature is higher than a set value, the vehicle speed is In the low-speed operation range until the vehicle speed reaches the set value or below, the speed of the above-mentioned blower fan is increased and reversed to obtain a wind speed higher than the driving wind, and when the vehicle speed exceeds the above-mentioned set value, the blower fan is adjusted to the correct speed in the high-speed operation range. A radiator fan control device for a two-wheeled motor vehicle, characterized in that the radiator fan control device is configured to rotate the radiator fan.