JPH0778367B2 - Liquid storage tank for motorcycle engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid storage tank for a motorcycle engine.

[0002]

2. Description of the Related Art In a motorcycle of a race type, in order to improve engine cooling performance, engine cooling water, oil lubricant, etc. are used in a heat exchanger. However, in the case of motorcycles, there are large restrictions on the size of the heat exchanger, the installation location, etc., so it is not possible to select a heat exchanger of a free size like an automobile, and it is cooled by a fan. Since there is no place to install a fan to blow the wind, the running wind is applied to the heat exchanger to cool it. For this reason, when the running wind is not expected and the running wind is low during low speed running such as a muddy road, the temperature of the engine may rise and overheating may occur.

In view of the above points, the present invention has an object to obtain a liquid storage tank for a motorcycle engine, in which the amount of circulating fluid stored is increased and overheat is reliably prevented.

[0004]

The present invention provides an engine mounted inside a frame space formed by a main frame extending rearward from a rear portion of a head pipe and a down tube extending obliquely downward from a rear portion of the head pipe,
A heat exchanger arranged in front of the engine, a liquid storage tank arranged below the heat exchanger and below the crankcase of the engine, and the engine, the heat exchanger, and the liquid storage tank communicate with each other. In a liquid storage tank of a motorcycle engine including a connecting pipe, at least a lower portion of the down tube is composed of two tubes spaced apart in a vehicle width direction, and a front portion of the liquid storage tank is inclined upward. The storage tank is formed in a long casing in the front-rear direction, the upper end of the storage tank is located below an exhaust port provided in front of the engine, and at least a part of the bottom surface is located below the down tube. Thus, it is characterized in that it is arranged between the two down tubes.

[0005]

After the circulating fluid for cooling stored in the liquid storage tank is supplied to the engine during operation of the engine, the circulating fluid heated by the cooling of the engine is sent to the heat exchanger and cooled. It is returned to the liquid storage tank again to effectively cool the engine. Moreover, the amount of the circulating liquid for cooling can be increased by the capacity of the liquid storage tank, and the cooling performance of the engine can be improved by increasing the amount of the circulating liquid. Moreover, the dead space below the front extension of the exhaust pipe can be effectively utilized.

[0006]

1 is a partial side view of a motorcycle according to the present invention, in which a main frame 1 of a head pipe 10 extends rearward from a rear portion thereof through a lower portion of a fuel tank 11.
2 is provided, and one down tube 5 extending obliquely downward from the rear portion of the head pipe 10 is provided. The lower part of the down tube 5 is branched into two down tubes 7 and 7 that are spaced apart in the vehicle width direction (Fig. 2). These main frames 12, down tubes 5 and down tubes 7 and 7 The engine 6 is mounted inside the constituted frame space.

By the way, a heat exchanger 9 for cooling the circulating fluid is arranged in the front part of the engine, and between the two down tubes 7, 7 below the engine and below the crankcase. A liquid storage tank 1 for storing the circulating liquid is arranged along the down tube 7 and a part of the bottom thereof is below the down tube 7.

As shown in FIGS. 2 to 4, the liquid storage tank 1 is formed in a casing shape which is long in the front-rear direction, in which the front portion is inclined upward and the rear portion is extended rearward, and the lower surface is a ship bottom shape 2. In addition, the upper surface has a shape along the front and lower shapes of the engine crankcase 13, and a bolt and nut or the like is used for the down tube 7 so that the upper end of the front portion is located below the exhaust port 14 of the engine. Have been fastened.

The liquid storage tank 1 is provided with an inlet 3 and an outlet 4 for lubricating the circulating liquid on the left and right of the upper end of the front part thereof, and the inlet 3 is connected to the heat exchanger 9 via a connecting pipe 8a. Has been done. The heat exchanger 9 is connected to the upper portion of the engine 6 via a connecting pipe 8b, and the engine 6 is further connected to the outlet 4 of the storage tank 1.

During operation of the engine, however, the circulating liquid in the liquid storage tank sequentially circulates through the engine 6 and the heat exchanger 9.

Therefore, in this motorcycle, the volume of the circulating fluid for cooling can be increased by the volume of the liquid storage tank 1 attached to the lower portion of the engine 6 without increasing the volume of the heat exchanger 9. 6, the heat exchanger 9 and the liquid storage tank 1 are circulated while being cooled, so that the temperature rise of the engine 6 can be prevented even when the motorcycle is stopped or running at a low speed on a mud road. Moreover, since the liquid storage tank 1 is disposed between the down tubes 7, 7 so that the bottom surface is at least partially downward, the liquid storage tank 1 does not take up a lot of space and interferes with the driving operation of the driver. do not become.

[0012]

As described above, according to the present invention, the front portion of the liquid storage tank provided below the heat exchanger is inclined forward and upward, and the upper end of the front portion is positioned below the exhaust port of the engine. Therefore, the front part of the liquid storage tank can be arranged in the dead space below the bent portion of the exhaust pipe projecting forward of the engine, the tank capacity, that is, the circulating liquid can be increased, and the cooling performance can be improved. It is possible to prevent overheating by reducing the temperature rise.

Further, since the liquid storage tank is mounted so that the inclined portion of the bottom of the ship is located in the front, the circulating liquid may cause running wind or mud not only when the motorcycle is running but also when the motorcycle is running at low speed. It is possible to radiate the circulating fluid satisfactorily in response to the above, and it is easy to slip over the obstacle even if there is an obstacle.

[Brief description of drawings]

FIG. 1 is a side view of the present invention,

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view of a liquid storage tank,

FIG. 4 is a side view of the same.

[Explanation of symbols]

 1 Liquid Storage Tank 2 Ship Bottom Type 5,7 Down Tube 6 Engine 9 Heat Exchanger 10 Head Pipe 11 Fuel Tank 12 Main Frame 13 Engine Crank Case 14 Exhaust Port

Claims (1)

[Claims] 1. An engine mounted inside a frame space formed by a main frame extending rearward from a rear portion of a head pipe and a down tube extending obliquely downward from a rear portion of the head pipe, and heat disposed in front of the engine. A motorcycle engine including an exchanger, a liquid storage tank disposed below the heat exchanger and below the crankcase of the engine, and a connecting pipe that connects the engine, the heat exchanger, and the liquid storage tank to each other In the liquid storage tank, at least the lower part of the down tube is composed of two tubes spaced apart in the vehicle width direction, and is formed in a casing shape in which the front of the liquid storage tank is inclined upward and is long in the front-rear direction. In addition, the upper end of this storage tank is located below the exhaust port provided in front of the engine. And a liquid storage tank of a motorcycle engine, wherein at least part of the bottom surface is disposed between the two down tube so as to be positioned below the said down tube.