JPH06311Y2 - Motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a motorcycle in which a radiator is arranged in front of an engine.

2. Description of the Related Art In a conventional motorcycle, an engine is usually mounted below a main frame that extends rearward from a head pipe above a vehicle body. Various types of main frames are used depending on the vehicle type, but a main frame made of a hollow material with a square cross section made by pressing a steel plate is also often used. Many motorcycles are also installed.

Further, in most motorcycles, a cowling is usually attached from an upper front portion to a rear side portion of the motorcycle body, and at least the upper side portion of the engine is covered by the cowling. The front surface between the both side plates of the cowling is an opening portion that is open toward the front, and the running wind enters between the both side plates through this opening portion and escapes backward. When the engine is water-cooled, the radiator is arranged in this opening and cooled by the traveling wind.

Problems to be Solved by the Invention In such a motorcycle, the air flowing between the both side plates of the cowling through the opening smoothly escapes backward, which reduces air resistance. Also, it is desirable in terms of effectively cooling the radiator and the like.

MEANS FOR SOLVING PROBLEMS AND EFFECTS OF EFFECT The present invention relates to an improvement of a motorcycle that meets such a demand, and has a pair of left and right main frames having a rectangular cross-sectional shape and inclined downward toward the rear. In a motorcycle in which an engine is mounted below the engine and a radiator is arranged in front of the engine, and the outside of the engine, the radiator and the main frame is at least partially covered by a cowling, a radiator is provided between the main frame and the cowling. By providing a space that can pass the cooling air that has passed through, at least in the rear portion of the main frame, by making a shape in which the contour of the cross section of the portion is obliquely cut from the side facing outward to the bottom. It is characterized by forming a slope that gradually extends outward from the front to the rear in a horizontal section. It

Since the present invention is configured as described above, a part of the cooling air that has passed through the radiator through the front opening is formed on the both sides of the engine, the radiator, and the cowling located outside the main frame. When passing through the gap with the cowling, part of the cooling air is guided by the slope of the main frame and the inner surface of the cowling, the cooling air passage width is gradually narrowed toward the downstream, and the air flow is disturbed. Without any trouble, it can smoothly flow out from the interval between the main frame and the cowling to the outside of the vehicle body, and as a result, increase in air resistance of the cooling air passing through the interval can be avoided, and the flow rate of the cooling air can be avoided. Is increased, the back pressure behind the radiator provided in the opening is maintained at a low level, the flow rate of cooling air passing through the radiator is increased, and the cooling of the radiator is increased. To improve the performance and capabilities.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the entire motorcycle according to the present invention, in which 1 is a front wheel and 2 is a rear wheel. The front wheel 1 is connected to a vehicle body frame via a front fork 3 and the rear wheel 2 is connected to a vehicle body frame via a rear foam 4. The body frame has a head pipe 5, a pair of left and right main frames 6 each having a square cross section and having a front end fixed to the head pipe 5 and extending rearward in a slanting downward direction, and an upper end fixed to each rear end of each main frame 6. The front foam 3 is pivotally attached to the head pipe 5 through a steering mechanism, and the rear fork 4 is pivotally attached to the center frame 7 so as to be swingable. ing.

From the connecting portion between the main frame 6 and the center frame 7,
As shown in FIG. 2, the back stay 8 extends upward, and its upper end is fixed to the middle portion of the seat rail 9. The front end of the seat rail 9 is fixed to the main frame 6, and a rear cushion 10 is provided between the seat rail 9 and the rear fork 4 as shown in FIG. These are covered by the rear cover 11. Reference numeral 12 is a fuel tank provided across the left and right main frames 6.

An engine 13 is mounted below the main frame 6 and in front of the center frame 7. The lower part of the rear of the engine 13 is mounted on the center frame 7 by a mounting member 14, and the upper part of the front of the engine 13 is mounted via an engine hanger 15. It is attached to the frame 6, and the engine 13 itself is a strength member of the vehicle body frame. The illustrated engine 13 is V
4-cylinder water-cooled engine, with two vertically arranged
It has one cylinder 16 and two cylinders 17 arranged in the front-rear direction.
Reference numeral 19 denotes a carburetor, which 18 extends rearward under the engine 13.

In front of the engine 13, a radiator 22 is arranged with its upper part attached to a gusset plate 20. And radiator
The outside of the rear part of the engine 22, the engine 13 and the main frame 6 is covered with a cowling 23. The cowling 23 includes a front surface portion 23a that covers an upper front surface of the vehicle body, and side plate portions 23b that continuously extend rearward from both side portions of the front surface portion 23a and respectively cover left and right side portions of the vehicle body. And both side plate portions 23b
An opening 24 is formed in the front of the space as shown in FIG.
The radiator 22 is located in the opening 24.

The rear portion of the main frame 6 has a cross sectional shape as shown in FIG. That is, the outer side 6a facing the side plate portion 23b of the cowling has a contour shape that is cut obliquely from the middle of the outer side 6a to the inside of the lower side 6b, and a slope 25 is formed on the lower outer side. In a horizontal cross section, this slope 25 gradually extends outward from the front to the rear as shown in FIG.

Therefore, the air flowing from the opening 24 between the side plates 23b during traveling passes through the radiator 22 and is cooled as shown by the arrow in FIG. The slope 25 without being disturbed by
It is guided and rectified by and goes out rearward along the inner surface of the side plate 23b with a smooth streamline. In this way, the flow of the air flowing between the two side plate portions 23b of the cowling through the opening 24 is made smooth, and the turbulence and stagnation are reduced, so that the air resistance is reduced and the flow rate is also increased. A sufficient amount of cooling air can be obtained. In the present specification, the radiator is not limited to one for cooling the engine cooling liquid, but also includes an oil cooler for cooling the oil.

[Brief description of drawings]

FIG. 1 is a side view showing an entire motorcycle to which the present invention is applied, FIG. 2 is a side view of a body frame of the motorcycle, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a sectional view taken along the line IV-IV. 1 ... front wheel, 2 ... rear wheel, 3 ... front fork, 4 ... rear fork, 5 ... head pipe, 6 ... main frame, 7
... Center frame, 8 ... Back stay, 9 ... Seat rail, 10 ... Rear cushion, 11 ... Rear cover, 12 ...
Fuel tank, 13 ... Engine, 14 ... Mounting member, 15 ...
Engine hanger, 16 ... Cylinder, 17 ... Cylinder,
18 ... Exhaust pipe, 19 ... Vaporizer, 20 ... Gusset plate, 22
... radiator, 23 ... cowling, 24 ... opening, 25
… Slopes.

Claims (1)

[Scope of utility model registration request] 1. An engine is mounted below a pair of left and right main frames having a rectangular cross-sectional shape and inclined downward toward the rear, and a radiator is arranged in front of the engine, the engine, the radiator and the main. In a motorcycle in which the outer side of a frame is at least partially covered by a cowling, a space is provided between the main frame and the cowling so that cooling air that has passed through a radiator can pass therethrough, and at least a rear portion of the main frame is provided with the space. The contour of the cross section of is cut obliquely from the side facing the outside to the bottom, so that a slope that gradually extends outward from the front to the rear in the horizontal section is formed. Motorcycle.