JPH0790817B2 - Motorcycle engine cooling system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling an engine of a motorcycle with water, and more particularly to a radiator including a main radiator and a sub radiator.

(Prior Art) In a conventional device for cooling an engine of a motorcycle by water cooling, when hot air from a radiator fan weakens a stirring action with the outside air and causes thermal pain and so-called heat damage to an occupant during a stop or low speed traveling. was there. This is because the radiator of the motorcycle is generally provided in front of the occupant, behind the front wheels and in front of the engine so as to be easily subjected to traveling wind.

By the way, it has been proposed to provide such a radiator at a rear end of a vehicle body in a special vehicle such as a racing car instead of a general vehicle (for example, JP-A-56-63569).
According to this configuration, it is suppressed that the hot air from the radiator hits the occupant to generate heat damage, but when this structure is applied to a general vehicle, the upper body of the occupant becomes an obstacle to the running wind to the radiator, There is a high possibility that the wind will hit the radiator badly and its performance will decline, so there is a difficulty in applying it to ordinary vehicles.

Further, as an engine cooling device for motorcycles, there is an example in which a radiator is divided into a main radiator and a sub radiator, the main radiator is provided at a normal position, and the sub radiator is provided in front of a steering wheel (for example, the actual opening 55-92).
However, this is merely for the purpose of increasing the cooling capacity, and the problem of the thermal influence on the occupant when the vehicle is stopped or running at a low speed has not been solved.

(Object of the Invention) The present invention solves the above-mentioned conventional problems, and is configured so that the hot air of the radiator fan does not directly or indirectly hit the occupant without lowering the cooling capacity, and the heat damage to the occupant is removed. Alternatively, it is an object of the present invention to provide an engine cooling device for a motorcycle, the reduction of which is intended.

(Structure of the Invention) The present invention relates to an engine cooling device for a motorcycle, in which a radiator for cooling engine cooling water is composed of a main radiator and a sub radiator, the main radiator is provided in a front part of a vehicle body, and the sub radiator is located behind a passenger seating position. This sub-radiator is equipped with a cooling fan that is driven at least during low-speed running or idling operation, and the portion that accommodates the sub-radiator is exhausted by the cooling fan and passing through the sub-radiator. It is provided with an exhaust hole for letting the flow out and an opening in a direction other than the front direction.

With this configuration, the cooling capacity of the main radiator during normal traveling is not reduced, and the hot air of the radiator fan does not directly or indirectly hit the occupant when the vehicle is stopped or traveling at low speed.

(Example) In FIGS. 1 and 2, 1 is an engine, 2 is a vehicle body frame, 3 is a front wheel, 4 is a rear wheel, 5 is a fairing, 6 is a side cover, 7 is a seat on which an occupant rides, Reference numeral 8 is a rear trunk provided behind the seat 7, and 9 is a side trunk provided below the rear trunk. Reference numeral 10 is a main radiator that cools the engine cooling water. The main radiator 10 is behind the front wheel 3 and in front of the engine 1 with respect to the vehicle body 2.
Installed on. Reference numeral 11 is a cover of the main radiator 10. Reference numeral 12 denotes a sub radiator for cooling the engine cooling water. The sub radiator 12 may be provided behind the passenger's riding position, and is provided in the rear trunk 8 in this embodiment. 13, 14 are reciprocating hoses for circulating the cooling water to the sub radiator 12, 15 is an electric pump for circulating the cooling water, 16 is a cooling water circulation by the electric pump 15 by detecting the temperature of the cooling water. Thermostat to control,
Reference numeral 17 denotes a cooling fan mounted on the sub radiator 12, and the cooling fan 17 is adapted to be driven at least during low speed running or idling operation. Further, the rear trunk 8 which is a portion for accommodating the sub radiator 12
The exhaust hole 19 is provided with an intake hole 18 for introducing outside air, and an exhaust hole 19 for discharging the exhaust flow that has been blown by the cooling fan 17 and has passed through the sub-radiator 12. It is opened in a direction other than the front so that it does not face. In this embodiment, intake holes 18 and exhaust holes 19 are provided on both side surfaces of the rear trunk 8.

In this embodiment, the sub radiator 12 is provided in parallel with the main radiator 10 via reciprocating hoses 13 and 14, and cooling water flows out from the engine at one end thereof as indicated by an arrow a, From the end, it flows into the engine as shown by arrow b.

Next, the operation of the above configuration will be described.

Main radiator 10 due to multiple running winds at high speed
The temperature rise of the warm air after passing through the vehicle can be suppressed, and the high temperature air does not hit the occupant due to the stirring of the traveling air. Also,
At this time, the cooling capacity of the main radiator 10 is sufficiently obtained. Next, when the vehicle is running at low speed or when the vehicle is stopped (the engine is idling), the cooling fan 17 of the sub radiator 12
Is driven. The cooling capacity at this time is higher than that at high speed running,
Since the heat generation amount of the engine is small, it may be small. Therefore, even if the main radiator 10 does not have a fan, the cooling capacity will not be insufficient. Thus, unlike the case where the main radiator 10 is equipped with a fan, hot air can be prevented from hitting the occupant, and the exhaust flow from the fan equipped in the sub radiator is not discharged toward the occupant. Can be eliminated or reduced.

Further, in the above embodiment, the cooling fan 17 of the sub radiator 12
Is driven at least during low-speed running or when stopped, this means that even when the sub-radiator 12 does not function during high-speed running, a large amount of running wind hits the main radiator 10 and sufficient cooling capacity is obtained here. Based on what is done.

Although the sub radiator 12 is provided in the rear trunk 8 in the above-described embodiment, the present invention is not limited to this, and the sub radiator 12 may be provided on the side surface of the vehicle body behind the passenger seating position. Since it is equipped with a fan 17, it does not have to be exposed to wind breezes, and if the exhaust holes provided in the part that houses the sub-radiator are oriented in directions other than the front direction, it can be laid out with great freedom at any position. be able to. Further, the main radiator 10 and the sub radiator 12 need not be provided in parallel, but may be provided in series, for example.

(Effects of the Invention) As described above, according to the present invention, the main radiator is provided at a normal position, the sub radiator is provided at the rear of the occupant's riding position, and the sub radiator is driven during low speed traveling or idling operation. Since a cooling fan is provided to prevent the exhaust flow from this fan from going to the occupant, the sub-radiator exerts a cooling effect during low-speed running or idling operation, and therefore, even if the main radiator does not have a fan, Even if the sub radiator does not hit the running wind, the cooling capacity does not decrease during low speed running or idling, and the hot air of the radiator fan does not directly or indirectly hit the passengers during low speed running or idling. , Elimination of heat damage to passengers or low It is possible to reduce.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a motorcycle in which an engine cooling device of the present invention is implemented, and FIG. 2 is a top view of a sub radiator part of the cooling device. 1 ... Engine, 3 ... Front wheel, 10 ... Main radiator, 12 ... Sub radiator, 13,14 ... Reciprocating hose, 17
…… Cooling fan, 19 …… Exhaust hole.

Claims (1)

[Claims] 1. A motorcycle engine cooling device comprising a main radiator and a sub radiator as a radiator for cooling engine cooling water, wherein the main radiator is provided in front of a vehicle body and the sub radiator is provided behind a passenger seating position. This sub-radiator is equipped with a cooling fan that is driven at least during low-speed running or idling operation, and the exhaust flow that has been blown by the cooling fan and has passed through the sub-radiator is discharged to the portion that houses the sub-radiator. An engine cooling device for a motorcycle, wherein the exhaust hole is provided in a direction other than the front direction.