JPH0351629B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scooter-type motorcycle equipped with a water-cooled engine.

[Prior Art] Scooter-type motorcycles have a large recess in the body frame downward between the handlebar and the seat to make it easier to get on and off the vehicle, and a large space is created above this recess to accommodate the rider's legs. Because of this, it is not possible to place a fuel tank or engine in this area. Therefore, most motorcycles of this type have a layout in which a fuel tank is disposed below the seat and a unit swing type engine is disposed below the fuel tank.

[Problems to be Solved by the Invention] Incidentally, in recent years, even for scooter-type motorcycles, the engine cooling method has been changed from the conventional forced air cooling method with the aim of improving engine output and durability, as well as reducing noise. It is being considered that instead of the conventional type, a water-cooled type can be used. When the engine is water-cooled in this way, a radiator for heat dissipation is naturally required.

However, in the case of scooter-type motorcycles, the roughly central part of the body frame is occupied as the rider's footrest, and the front of this footrest is covered by a leg shield, which also covers the area around the engine. to be covered with
It is extremely difficult to install the radiator in a place with good ventilation, and there is a problem in that it is difficult to decide where to install the radiator.

The present invention has been developed based on the above circumstances, and allows the radiator to be installed in a location where it easily receives cooling air without impairing the appearance unique to scooter-type motorcycles, thereby improving cooling efficiency. To provide an engine cooling device which is advantageous in terms of heat countermeasures without the heat source being concentrated in a cover under a seat.

[Means for Solving the Problems] Therefore, in the present invention, the vehicle body frame is recessed downward between the handlebar and the seat, a step board is mounted on this recess, and the vehicle body frame is installed in front of the step board. In addition to providing windproof leg shields that protrude on both the left and right sides,
In a scooter-type motorcycle in which an engine is disposed below the seat, and the engine is surrounded by a cover connected to the seat, the engine is water-cooled, and a radiator for cooling the engine is installed in front of the leg shield and in front of the leg shield. The radiator is disposed in the space between the radiator and the front cover that covers the radiator, and the front cover has a ventilation hole that guides cooling air to the radiator.

[Function] According to this configuration, the leg shield is located at the front end of the vehicle body frame in the direction of travel and blocks the flow of wind toward the driver's legs. This is a place directly exposed to the wind, and if the radiator is placed on the front side of the leg shield, the wind from the front will be efficiently guided to the radiator through the ventilation holes in the front cover. Therefore, the radiator can receive the running wind favorably as cooling wind, and the cooling efficiency is improved.

Moreover, since the radiator is covered by the front cover and leg shield, the radiator is not exposed to the outside, and the appearance unique to scooter-type motorcycles, which hides the complex structure of the engine and body, is maintained. It will not be damaged.

Further, since the radiator is installed in a location different from the cover surrounding the water-cooled engine, the heat source is not concentrated within the cover, and an increase in the atmospheric temperature within the cover can be prevented.

[Example] The present invention will be described below based on an example shown in the drawings.

Reference numeral 1 in the figure is a frame that constitutes the vehicle body,
A down tube 3 extending downward is connected to the head pipe 2 located at its front end. A pair of left and right main pipes 4 are connected to the lower end of the down tube 3. The main pipe 4 extends rearward substantially horizontally, and its rear end is raised upward, and the upper ends of these rising portions 5 extend rearward substantially horizontally to form a pair of left and right seat rails 6. It consists of

A steering shaft 7 is rotatably inserted through the head pipe 2, and a front fork 8 is connected to the lower end of the steering shaft 7. The front fork 8 supports a front wheel 9 via an axle 9a, and is steered by a handle 10 attached to the upper end of the steering shaft 7. Additionally, a fuel tank 1 is provided between the front ends of the seat rails 6.
1 is attached, and a seat 12 is installed on this fuel tank 11. Therefore, the frame 1 has an underbone shape that is greatly recessed downward between the handle 10 and the seat 12, and a step board 14 is placed on the front part of the main pipe 4, which is the bottom of this recess 13. is set up.

Moreover, in the rising part 5 of the main pipe 4,
Located below the fuel tank 11, the front end of a unit swing type engine unit 18 is pivotably supported. This engine unit 18
The water-cooled engine 19 and the transmission case 21 extending rearward from the left side of the crankcase 20 of the water-cooled engine 19 are constructed as an integral structure. A rear wheel 22 is supported, which is driven by a belt automatic transmission (not shown) housed within.

Note that the rear end of the transmission case 21 is suspended by a buffer 27 installed between it and one of the seat rails 6.

Water-cooled engine 19 of this engine unit 18
From around the area to above the rear wheel 22, the seat 1
It is covered by a cover 23 which is continuous with the second part.
This cover 23 continues to the rear end of the step board 14 and covers the front surface of the rising section 5.
Front cover 2 that covers the front half of the fuel tank 11
4, an upper cover 25 that extends from the front cover 24 and covers from the rear half of the fuel tank 11 to the upper part of the seat rail 6, and a top cover 25 that extends from the side of the water-cooled engine 19 to the seat rail 6 and continues from both covers 24 and 25. It is composed of a pair of left and right side covers 26 that cover the sides of the water-cooled engine 19, and is of a so-called full covered type that continuously covers the periphery of the water-cooled engine 19.

Incidentally, a leg shield 30 is provided in front of the step board 14 to protect the driver's legs from the wind. The leg shield 30 is attached to the head pipe 2 as shown in FIGS.
The leg shield 30 extends integrally in the left-right direction along the down tube 3, and the lower end of the leg shield 30 is connected to the front end of the step board 14. A recess 31 is formed in the center of the front surface of the leg shield 30 and extends around the rear of the head pipe 2 and down tube 3. The recess 31 covers the head pipe 2 and the down tube 3 from the rear surface to the side surface, and opens toward the front of the leg shield 30. In addition, a front fender 3 is provided at the upper front of the leg shield 30.
3 is removably attached. The front cover 34 has locking protrusions (not shown) provided at its upper and lower ends that lock into the openings of the recesses 31 of the leg shield 30, and
The intermediate portion is fixed to a bracket 35 welded to the front surface of the head pipe 2 by tightening bolts 36. That is, as shown in FIG. 5, the bracket 35 includes a pair of left and right stays 37 protruding forward from the front opening of the recess 31, and the front cover 34 is abutted against the tips of the stays 37.
The leg shield 30 is fixed by inserting bolts 38 through this abutting portion and screwing these bolts 38 into nuts 39 welded to the stay 37. And the front cover 34
covers the front opening of the recess 31, and this recess 3
A space 32 surrounding the head pipe 2 and the steering shaft 7 is formed between the head pipe 2 and the steering shaft 7.

As shown in FIG. 4, this space 32 accommodates a radiator 40 of the water-cooled engine 19. The radiator 40 is composed of a radiator core 41 having cooling fins and a core frame 42, and is fixed to the front side of the head pipe 2 within the space 32. That is, a pair of brackets 43 are welded to the front surface of the head pipe 2, spaced apart in the vertical direction. The bracket 43 extends in the left-right direction on the front side of the head pipe 2, and its both ends extend forward to form left and right support pieces 44. The core frame 42 of the radiator 40 is sandwiched between the support pieces 44 of these brackets 43, and is fastened and fixed with bolts 45. Therefore, radiator 4
0 is placed in the space 32 with the front surface of its radiator core 41 facing forward. The front surface of the radiator core 41 is covered by the front cover 34, and the front cover 34 has a plurality of slits in a portion facing the radiator core 41 to guide the running wind from the front to the radiator core 41. The ventilation port 46 is open.

Note that reference numeral 47 in the figure indicates a handle cover that covers the periphery of the handle 10.

According to such a configuration, the radiator 40 for engine cooling is disposed in the space 32 between the windproof leg shield 30 and the front cover 34 that covers the front surface of the leg shield 30, and the front cover 34 is exposed to air from the front. Since the ventilation port 46 that guides the running wind to the radiator core 41 is provided, this radiator 4
0 allows the vehicle to receive the wind from the front as a cooling wind while driving.

That is, since the leg shield 30 is located at the front end of the vehicle in the direction of travel and blocks the flow of wind toward the driver's legs, the front side of the leg shield 30 is directly exposed to the wind while driving. If the radiator 40 is installed on the front side of the leg shield 30, the wind from the front is efficiently guided to the radiator 40 through the ventilation opening 46 of the front cover 34. Therefore, the radiator 40 can receive the running wind favorably as cooling wind, and the cooling efficiency is improved.

Moreover, since the radiator 40 is covered by the front cover 34 and the leg shield 30, the radiator 40 is not exposed directly at the front of the leg shield 30, which is unique to scooter-type motorcycles that cover all complex structural parts. The advantage is that the appearance is not damaged.

Furthermore, by providing the radiator 40 on the leg shield 30 side, the cooling air that has passed through the radiator 40 and has become high temperature is not discharged into the cover 23 that covers the water-cooled engine 19, and heat is generated inside the cover 23. I don't concentrate. Therefore, it is possible to prevent the atmospheric temperature within the cover 23 from rising, which is advantageous in terms of heat countermeasures.

Although the radiator is placed in front of the head pipe in the above embodiment, the present invention is not limited to this.
It may be placed at a position biased to either the left or right side of the head pipe.

[Effects of the Invention] According to the present invention described in detail above, the running wind from the front is efficiently guided to the radiator through the ventilation hole of the front cover, so the radiator can receive the running wind well as cooling wind. I can do it, and that's it.
Cooling efficiency is improved. Moreover, since the radiator is covered by the front cover and leg shield, the radiator is not exposed directly to the front of the leg shield, and the unique appearance of a scooter-type motorcycle, which covers all complex structural parts, is not impaired. It ends up being

Further, since the heat source is not concentrated inside the cover, it is possible to prevent the atmospheric temperature inside the cover from rising, which is advantageous in terms of heat countermeasures.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a scooter type motorcycle, Fig. 2 is a side view of the area around the front fork, Fig. 3 is a front view of the scooter type motorcycle, and Fig. 4 is a side view of the scooter type motorcycle. FIG. 2 is a cross-sectional view taken along the line - in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line - in FIG. 2. 1... Vehicle body frame (frame), 10... Handle, 12... Seat, 13... Recess, 14...
...Step board, 19...Water-cooled engine, 23
...Cover, 30...Retsushield, 32...
Space, 34...front cover, 40...radiator, 46...ventilation port.

Claims (1)

[Scope of Claims] 1. The vehicle body frame is recessed downward between the handlebar and the seat, a step board is attached to this recess, and a windproof leg shield is provided in front of the step board that extends on both the left and right sides of the vehicle body frame. In a scooter-type motorcycle, in which the engine is arranged below the seat and the engine is surrounded by a cover connected to the seat, the engine is water-cooled, and the radiator for cooling the engine is installed in the leg shield. An engine cooling device for a scooter-type motorcycle, characterized in that the engine cooling device is disposed in a space between a front surface and a front cover covering the front surface, and the front cover is provided with a ventilation hole for guiding cooling air to a radiator.