JP3120529B2 - Motorcycle cooling water reservoir tank mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water reservoir tank mounting structure for a motorcycle in which a mounting position of a reservoir tank for temporarily storing cooling water in a radiator is improved.

[0002]

2. Description of the Related Art FIG. 8 is a side view showing a body frame of a motorcycle to which a conventional cooling water reservoir tank mounting structure is applied.

In general, in the water-cooled engine 1, the cooling water whose temperature has risen by cooling the engine is cooled by a radiator 3 arranged in the front part of the body frame 2. The radiator 3 is connected to a reservoir tank 4 for temporarily storing the cooling water expanded due to the temperature rise.

[0004] The reservoir tank 4 is generally arranged below the seat 5 in consideration of maintainability such as checking the amount of cooling water and replenishing the cooling water. That is, the reservoir tank 4 is disposed below the seat 5 and between the air cleaner 7 and the battery 8.

[0005]

However, if the reservoir tank 4 is disposed below the seat 5 as described above, the seat 5 must be removed every time the cooling water is inspected or refilled. Not good.

An air cleaner 7 is provided below the seat 5.
Although the battery 8 is also provided, since the reservoir tank 4 is provided, the capacity of the air cleaner 7 is accordingly restricted, and the capacity of the air cleaner 7 cannot be set large.

Further, since the reservoir tank 4 is disposed below the seat 5 at a position higher than the vehicle body frame 2, a number of components are installed below the reservoir tank 4. Therefore, when replenishing the cooling water from the inlet of the reservoir tank 4, if the cooling water is zeroed out,
The spilled cooling water may adhere to the above-mentioned many components, causing rust or adversely affecting electrical components.

The present invention has been made in view of the above-mentioned circumstances, and has good maintenance characteristics of a reservoir tank, can increase the capacity of an air cleaner, and has another advantage when the cooling water is zeroed at the time of cooling water injection. It is an object of the present invention to provide a cooling water reservoir tank mounting structure for a motorcycle that can reduce the influence on parts.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a motorcycle cooling water reservoir tank mounting structure according to the present invention comprises: a water-cooled engine mounted on a vehicle body frame; And a radiator arranged in the front part of the body frame, and a swing arm pivotally supported so as to be able to swing up and down around a swing arm pivot part provided in the center lower part of the body frame behind the engine.
A fuel tank disposed above the water-cooled engine, a seat connected to the rear of the fuel tank and supported by a rear frame of the vehicle, and a center portion of the vehicle frame between the fuel tank and the seat and the swing arm. An intake system for the arranged engine, and a reservoir tank for storing cooling water of a radiator is provided at a lower center portion of the vehicle body frame. This reservoir tank has a tank portion disposed below a pivot portion of a swing arm, and an injection portion. Is extended from the upper part of the tank part to the front of the swing arm pivot part, and the injection port is formed at a position higher than the swing arm pivot part.

[0010]

Therefore, according to the cooling water reservoir tank mounting structure for a motorcycle according to the present invention, the seat is removed because the reservoir tank is not located below the seat but at substantially the same position as the swing arm pivot portion of the body frame. Without this, the amount of cooling water can be easily inspected and the cooling water can be easily replenished from the inlet of the reservoir tank.

Although an air cleaner is generally arranged below the seat, the layout is such that the reservoir tank is not arranged below the seat, so that the capacity of the air cleaner can be increased by removing the reservoir tank, contributing to an improvement in engine output. it can.

Further, since the reservoir tank is disposed at substantially the same position as the swing arm pivot located at the lower part of the vehicle body frame, there are almost no other components below the reservoir tank. For this reason, even if the cooling water is zeroed when the cooling water is injected from the inlet of the reservoir tank, the spilled cooling water hardly adheres to other parts, and the influence on other parts can be reduced. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial side view of FIG. 2 showing an embodiment of a cooling water reservoir tank mounting structure for a motorcycle according to the present invention. FIG. 2 is a body frame in which the reservoir tank of FIG. 1 is installed. FIG.

As shown in FIGS. 2 and 4, the body frame 10 is a double cradle frame, and a pair of left and right main tubes 12 extend rearward of the head pipe 11. The main tube 12 bends downward on the way, and a pair of left and right seat rails 1
4 are welded. On the other hand, a pair of left and right down tubes 13 extend downward from the head pipe 11. The down tube 13 is bent rearward on the way, further bent obliquely rearward and upward, and the lower end of the main tube 12 is welded. The down tube 13 extends further rearward and upward from the connection with the main tube 12 and is welded to the seat rail 14, and the rear portion of the down tube 13 functions as a seat pillar that supports the seat rail 14.

A swing arm pivot portion 15 is provided at a joint between the main tube 12 and the down tube 13.
It is welded so as to reinforce the joint. The swing arm pivot portion 15 is located at the lower center of the body frame 10. Also, a pair of left and right main tubes 12
An upper bridge 16 and a lower bridge 17 are respectively bridged on the upper and lower portions of the
And the down tube 13 are each reinforced. Further, the reinforcement 18 is also welded between the main tube 12 and the down tube 13 near the head pipe 11 to reinforce the periphery of the head pipe 11.

A front fork 19 shown in FIG. 2 is supported on the head pipe 11 via a steering shaft (not shown) so as to be swingable in the left-right direction. A handlebar 20 is attached to an upper portion of the front fork 19, and a front wheel 21 is rotatably supported at a lower portion of the front fork 19. In addition, the swing arm pivot unit 1
A swing arm 22 is supported by the swing arm 5 so as to be vertically swingable. A rear wheel 23 is rotatably supported by a free end of the swing arm 22.

An engine 24 is mounted in a space surrounded by the main tube 12 and the down tube 13, and a carburetor 25 and an air cleaner 26 serving as an intake system of the engine 24 are arranged below a fuel tank 27 and a seat 28. . A battery 29 is disposed below the seat 28 in addition to the air cleaner 26. The fuel tank 27 is supported by the main tube 12, and the seat 28 is supported by the seat rail 14. Also,
An exhaust pipe 30 and a muffler 31 are sequentially connected to the engine 24. The exhaust pipe 30 and the muffler 31 are arranged below the down tube 13 so as to substantially follow the shape of the down tube 13.

On the other hand, a radiator 32 is installed near the lower part of the head pipe 11 in front of the down tube 13.
The engine 24 is a water-cooled engine, and the engine 2
4 is cooled by cooling water circulating in a water jacket (not shown). The radiator 32 cools the cooling water which has become high temperature by cooling the engine 24. A reservoir tank 34 is connected to the radiator 32 via a reservoir hose 33, and the cooling water in the radiator 32 is temporarily stored. That is, when the temperature of the cooling water in the radiator 32 increases and the volume expands, the reservoir tank 34 temporarily stores the cooling water overflowing from the radiator 32, and conversely, the temperature of the cooling water decreases. When the pressure inside the radiator 32 becomes negative, the reservoir tank 3
4. Return the cooling water stored in 4 to the radiator 32,
The amount of cooling water in the radiator 32 is always constant.

The reservoir tank 34 includes a tank section 35
As shown in FIG. 1, it is arranged at substantially the same position as the swing arm pivot 15 when viewed from the side of the body frame 10. That is, the tank part 35 is located below the swing arm 22 and the swing arm pivot part 15, and the injection part 36 is located between the front part of the swing arm pivot part 15 and the engine 24 and the front part of the swing arm pivot part 15. Are arranged along the shape of.

As shown in FIGS. 5, 6, and 7, the injection portion 36 of the reservoir tank 34 extends obliquely upward from one side of the upper portion of the tank portion 35, and has an upper end for supplying cooling water. Is provided. The tank 35 is a portion for storing cooling water, and has a hose plug 38 at the lower end.
Is provided. One end of the reservoir hose 33 is connected to the hose plug 38, and the other end of the reservoir hose 33 is connected to the radiator 32, so that cooling water flows between the radiator 32 and the tank 35 of the reservoir tank 34. At the upper end of the tank 35, an atmospheric pressure port 39 for maintaining the inside of the tank 35 at atmospheric pressure is provided.

At the upper part of the hose plug 38 of the tank part 35 and the lower part of the injection part 36, mounting pieces 40 are formed. On the other hand, as shown in FIGS. 1, 3 and 4, a pair of engine mounting brackets 41 are welded to the lower bridge 17 of the vehicle body frame 10, and a reservoir tank mounting bracket 42 is provided at a central position of these engine mounting brackets 41. Is welded. The reservoir tank 34 is fixed to the lower bridge 17 of the vehicle body frame 10 by fixing the mounting piece 40 to the reservoir tank mounting bracket 42 by bolts. Reference numeral 43 in FIG. 3 is a frame center indicating the center of the body frame 10 in the left-right direction.

According to the above embodiment, the reservoir tank 34
Is located not below the seat 28 but at substantially the same position as the swing arm pivot 15 of the body frame 10 and the tank 35 of the reservoir tank 34 is arranged below the swing arm pivot 15 and the swing arm 22. The cooling water amount can be easily detected without removing the cooling water 28, and the cooling water can be refilled into the tank 35 from the inlet 37 without removing the sheet 28. For this reason, the maintainability of the reservoir tank can be improved.

Also, since the layout is such that the reservoir tank 34 is not arranged below the seat 28, the capacity of the air cleaner 26 can be increased by the amount of removing the reservoir tank 34 below the seat 28, and the engine output can be reduced. It can contribute to improvement.

Further, the reservoir tank 34 is disposed at substantially the same position as the swing arm pivot portion 15 of the body frame 10, and since there are almost no other components below this position, the cooling water is supplied from the inlet 37 of the reservoir tank 34. Even if the cooling water is spilled at the time of refilling, the spilled cooling water does not adhere to other parts, and the influence on other parts can be reduced. In particular, since electrical components are components that are difficult to waterproof, adverse effects on electrical components can be reduced.

Further, since the injection part 36 of the reservoir tank 34 is disposed in the gap between the swing arm pivot part 15 and the engine 4, this gap can be filled in a good form and the appearance of the motorcycle can be improved. .

[0027]

According to the cooling water reservoir tank mounting structure for a motorcycle according to the present invention, a swing arm pivot portion for pivotally supporting a swing arm is located at a lower center portion of a vehicle body frame, and a radiator is provided at a front portion of the vehicle body frame. The reservoir tank for storing the cooling water in the radiator is arranged at the center lower part of the vehicle body frame.This reservoir tank is arranged below the swing arm pivot part, and the injection part is swung from the upper part of the tank part. Extending the front of the pivot section and forming the inlet at a higher position than the swing arm pivot section, the reservoir tank can be maintained without removing the seat, maintaining good tank maintenance, and cooling the reservoir tank with cooling water with water. It is located in the lower part of the body near the engine and below the swing arm pivot. Because there, centralized and lower center of gravity of the mass can be expected, thereby improving the running stability. In addition, the reservoir tank is located below the swing arm pivot part where the swing arm's up and down swing is small, and the injection part is provided to extend away from the swing arm, so the tank part approaches the swing arm It is possible to increase the tank capacity, reduce the amount of protrusion below the vehicle body, effectively prevent the ground height from lowering, and furthermore, when cooling water is injected at the time of cooling water injection, The effect on parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial side view of FIG. 2, showing one embodiment of a cooling water reservoir tank mounting structure for a motorcycle according to the present invention.

FIG. 2 is an overall side view showing a vehicle body frame in which the reservoir tank of FIG. 1 is installed.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a perspective view showing the vehicle body frame of FIG. 2 together with a reservoir tank.

FIG. 5 is a front view of the reservoir tank shown in FIG. 1;

FIG. 6 is a right side view of the reservoir tank shown in FIG. 5;

FIG. 7 is a plan view of the reservoir tank of FIG. 5;

FIG. 8 is an overall side view showing a vehicle body frame to which a conventional cooling water reservoir tank mounting structure is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body frame 15 Swing arm pivot part 22 Swing arm 32 Radiator 34 Reservoir tank 35 Tank part 36 Injection part 37 Inlet

Claims (1)

(57) [Claims] 1. A water-cooled engine mounted on a body frame, a radiator disposed in front of the water-cooled engine and in a front part of the body frame, and around a swing arm pivot provided in a center lower part of the body frame behind the engine. A fuel tank disposed above the water-cooled engine, a seat that is connected to the rear of the fuel tank, and is supported by a vehicle body rear frame; An intake system of an engine arranged at the center of the body frame between the tank and the seat and the swing arm, and a reservoir tank for storing cooling water of a radiator is provided at a lower center part of the body frame, and the reservoir tank is Position the tank below the pivot of the swing arm and place the injection section from the top of the tank A cooling water reservoir tank mounting structure for a motorcycle, wherein an injection port is formed at a position higher than the swing arm pivot portion so as to extend forward of the swing arm pivot portion.