JPH0343445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid storage tank for a motorcycle engine.

Motorcycles of the type that are raced often have circulating fluid type engines that use cooling water, cooling oil, etc. to improve engine cooling performance. This circulating fluid type engine is equipped with a heat exchanger to cool and use the circulating fluid, but in the case of motorcycles, there are major restrictions on the size of the heat exchanger, where it can be installed, etc. Since it is not possible to choose a heat exchanger of any size, and there is no place to mount a fan to apply cooling air, the heat exchanger is cooled by air from the vehicle. Therefore, when the vehicle is stationary, where no wind is expected, or when the vehicle is running at low speeds such as on a muddy road, the engine temperature may rise and overheat.

In view of this, the present invention provides a liquid storage tank for circulating fluid that cools the engine between the lower down tubes to increase the amount of circulating fluid that can be accommodated.
An embodiment of the present invention, which is designed to prevent overheating, and is shown in the drawings will be described below.

The storage tank 1 is formed into a long housing shape with the front part inclined upward and the rear part extended, the bottom surface is shaped like a ship's bottom 2, and an inlet 3 and an outlet 4 for circulating the circulating fluid are provided on the left and right sides of the upper end of the front part. .

A main frame 12 is provided that extends rearward from the rear of a head pipe 10 of a motorcycle to which this storage tank 1 is attached, passing through the lower part of a fuel tank 11. Further, one down tube 5 is provided extending diagonally downward from the rear part of the head pipe 10.
Two down tubes 7, 7 are provided at the lower part of the down tube 5, spaced apart in the vehicle width direction. The engine 6 is mounted inside a frame space constituted by the main frame 12, down tube 5, down tubes 7, 7, etc.

A storage tank 1 with the slope facing forward is disposed below the engine 6 and between the two down tubes 7, and is fastened using bolts and nuts.

The inlet 3 of the storage tank 1 is connected to one side of a heat exchanger 9 for cooling the circulating fluid of the engine 6 through a connecting pipe 8. The other side of the heat exchanger 9 is connected to the upper part of the engine 6 via a connecting pipe 8, and the engine 6 is connected to the outlet 4 of the storage tank 1.
Connect to.

Therefore, in this motorcycle, the amount of circulating fluid for cooling can be increased by the capacity of the storage tank 1 attached to the lower part of the engine 6 without increasing the capacity of the heat exchanger 9, and this increased amount of circulating fluid allows the engine 6, Since the heat exchanger 9 and the storage tank 1 are cooled and circulated, the temperature of the engine 6 can be prevented from rising even when the motorcycle is stopped or running at low speed on a muddy road.

Moreover, the lower down tube is constituted by at least two tubes 7, 7 formed to the width of the engine 6, for example, and the down tubes 7, 7
Since the storage tank 1 is arranged so that the bottom surface is at least one point below between the two, the storage tank 1 does not take up much space and does not interfere with the driver's driving operations.

As explained above, the liquid storage tank for a motorcycle engine of the present invention includes a housing-shaped storage tank with a bottom surface shaped like a ship's bottom and long from the front to the rear, which is disposed between at least two lower down tubes, Since it is formed as a circulation circuit for cooling circulating fluid that circulates inside the engine, heat exchanger, etc., the amount of circulating fluid can be increased.
It is possible to prevent overheating by reducing the temperature rise of the engine, etc.

In addition, since the storage tank was installed with the bottom-shaped slanted part at the front, the circulating fluid is exposed to wind, mud, etc. not only while the motorcycle is running, but also when driving at low speeds on muddy roads. It is possible to effectively dissipate heat from the circulating fluid in the lever.

Furthermore, since the storage tank is provided between the lower down tubes, it does not take up much space or get in the way, and it also lowers the center of gravity of the motorcycle, allowing it to run stably.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view, FIG. 2 is a perspective view, FIG. 3 is a plan view of a storage tank, and FIG. 4 is a side view of the same. 1...Storage tank, 2...Bottom type, 5, 7...
...Down tube, car body, 6...engine, 9...
...Heat exchanger, 10...Head pipe, 11...Fuel tank, 12...Main frame.

Claims (1)

[Claims] 1. An engine mounted inside a frame space formed by a main frame extending rearward from the rear of the head pipe and a down tube extending diagonally downward from the rear of the head pipe, a heat exchanger disposed in front of the engine, and a heat exchanger disposed in front of the engine. A liquid storage tank for a motorcycle engine comprising a storage tank disposed below the exchanger and near the engine, and a communication pipe that communicates the engine, the heat exchanger, and the storage tank, each of which includes at least one of the down tubes. The lower part is composed of two tubes spaced apart in the vehicle width direction, and the front of the storage tank is formed into a housing shape that is long in the front-rear direction with an upward slope. A liquid storage tank for a motorcycle engine, characterized in that the liquid storage tank is arranged between the two down tubes so that at least a part of the bottom surface is located below the down tubes.