JP2505682B2 - Liquid cooling structure 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 cooling structure 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 cooling structure for a motorcycle engine in which the amount of lubricating liquid contained is increased to reliably prevent overheating.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a heat exchanger is arranged above and below a main frame extending rearward from a rear portion of a head pipe, and a heat exchanger is arranged along a lower portion of the engine crankcase. And a liquid storage tank whose front portion is inclined forward and upward and which is formed in a long casing in the front-rear direction is provided, and between the engine and the heat exchanger, between the heat exchanger and the liquid storage tank and between the liquid storage tank and the engine. It is characterized in that each of them is connected by a connecting pipe to form a circulation circuit.

[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 circulating fluid for cooling can be increased by the capacity of the liquid storage tank, and the temperature rise of the engine can be sufficiently prevented even when the motorcycle runs at low speed on the mud road while stopped.

[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 disposed in the upper front portion of the engine, and the two down tubes are provided below the heat exchanger 9 and below the engine crankcase. A liquid storage tank 1 for storing the circulating liquid is disposed along the engine crankcase.

As shown in FIGS. 2 to 4, the liquid storage tank 1 is formed in a long casing shape in which the front portion is inclined upward and the rear portion is extended, and the lower surface is a ship bottom shape 2 and the upper surface. Has a shape conforming to the front side and the lower side of the engine crankcase 13, and is fastened to the down tube 7 by using bolts and nuts so that the upper end of the front portion is located below the exhaust port 14 of the engine. There is.

The liquid storage tank 1 is provided with an inlet 3 and an outlet 4 for circulating the circulating liquid on the left and right of the front upper end 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 circulating fluid for cooling can be increased by the capacity of the storage tank 1 attached to the lower portion of the engine 6 without increasing the capacity of the heat exchanger 9.
The increased circulating fluid circulates while cooling the inside of the engine 6, the heat exchanger 9, and the liquid storage tank 1, so that the temperature rise of the engine 6 can be prevented even when the motorcycle is stopped or running at a low speed in a muddy road. Moreover, the installation of the liquid storage tank 1 does not take up much space and does not interfere with the driving operation of the driver.

[0012]

As described above, according to the present invention, since the liquid storage tank is arranged below the heat exchanger arranged in front of the engine, the circulating liquid is increased, and the heat exchanger and the liquid storage are further increased. The circulating liquid is cooled in both the tanks, and the temperature rise of the engine and the like can be reduced to prevent overheating. Moreover, the circulating fluid can receive the running wind, mud, and the like, and can radiate the circulating fluid satisfactorily, not only while the motorcycle is traveling but also at low speed traveling on the mud road. Furthermore, since the liquid storage tank is provided below the heat exchanger, it does not occupy any space and is not an obstacle, and the center of gravity of the motorcycle can be lowered and stable running can be performed.

[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 8a, 8b Connection Pipe 9 Heat Exchanger 10 Head Pipe 11 Fuel Tank 12 Main Frame

Claims (1)

(57) [Claims] To Tomo 1. A when the rear portion of the head pipe disposing a heat exchanger before above the engine mounted below the main frame extending rearward, along the bottom of the engine crankcase, the front upper front A liquid storage tank formed in a casing that is long in the front-rear direction and inclined to
Between heat exchangers, between heat exchangers and liquid storage tanks, and liquids
Connect the storage tank and the engine with connecting pipes.
A liquid cooling structure for a motorcycle engine, characterized in that a circulation circuit is formed .