JPH0234157Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a radiator installation structure in a two-wheeled vehicle equipped with a water-cooled engine.

In motorcycles, how to arrange auxiliary equipment on the vehicle body is an extremely important consideration in terms of effective space utilization and appearance.For motorcycles equipped with water-cooled engines, various methods are used to arrange the radiator. By the way. Generally, the radiator is attached to the front part of the down tube that makes up the body frame, but in special racing motorcycles such as motocross racers that do not have a headlight, the radiator is sometimes attached to the top of the front fork in front of the head pipe. ing. However, in the former case, the cooling efficiency of the radiator is affected by the fact that the cooling air after passing through the radiator, that is, the wake of the radiator, hits the downtube, or that the radiator is covered with muddy water splashed up by the front wheels when driving in the rain. A problem occurs that causes a decrease in In the latter case, the weight of the radiator is placed on the front fork, so the inertial weight during steering operations becomes large, making steering operations that much heavier, and the cooling hoses connected to the radiator also have enough room to accommodate the rotation of the radiator. It is also assumed that the downstream flow of the radiator hits the head pipe, resulting in a decrease in cooling efficiency as in the former case.

This idea was made in view of the above circumstances,
The object of the present invention is to provide a radiator installation structure in which the radiator flow flows smoothly, improving the cooling efficiency of the radiator, and reducing the inertial weight during steering operation.

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

Figure 1 is a side view of a motorcycle, where 1 is a double cradle type body frame, 2 is a body frame 1
3 is a front wheel, 4 is a front fork that pivots the front wheel 3,
5 is a front fender, 6 is a rear wheel, and 7 is a rear fork that pivotally supports the rear wheel 6. Although detailed illustrations are omitted, the front portion of the rear fork 7 is connected to the vehicle body frame 1 via a link mechanism and a damper, and uses a so-called pro-ring rear wheel suspension system.
Further, 8 is a chain for transmitting engine power to the rear wheels 6, 9 is a steering handle, 10 is a fuel tank, 11 is a seat, and 12 is a side cover.

The vehicle body frame 1 includes an upper main frame 13, a lower down tube 14, a seat rail (not shown) extending rearward from the main frame 13 on which the seat 11 is placed, and a lower part of the main frame 13 and a rear part of the seat rail. Connecting stay 15,
It is composed of a head pipe 16 (see FIG. 2) forming the front end of the vehicle body frame 1 and to which a main frame 13 and a down tube 14 are connected.

Further, reference numeral 17 denotes a cowling that covers the front part of the vehicle body, and the details of the front part of the vehicle body will be explained with reference to FIGS.
8, a meter unit 19, a headlight 20, etc. are arranged, and these are attached to a mounting frame 21.

The mounting frame 21 is formed by bending and welding a pipe, and as shown in a perspective view in FIG.
c is formed continuously, and the rising portion 21
The headlight mounting portion 21d is welded and connected at the lower end of b, and the upper frame portion 2 is connected above the rising portion 21b.
The front end of the upper frame part 21e is welded and connected, and the rear end of the upper frame part 21e is tapered in the center from the left and right to the mounting plate part 2.
1f, and this mounting plate part 21f
is the bracket 22 fixed to the head pipe 16.
The lower frame portion 21a extends rearward and has a mounting plate portion 21g formed at its rear end.
This mounting plate portion 21g is connected to a mounting member 23 fixed to the down tube 14 with bolts. As mentioned above, not only the radiator 18 but also the meter unit 19 and the headlight 20 are attached to this mounting frame 21.
The inertial weight around the steering axis is significantly reduced, making steering operations easier.

The front fork 4 has a head pipe 16
It is connected via a top ridge 25 and a bottom bridge 26 to a steering stem 24 which is fitted into and rotatably supported by the steering stem 24 . Note that the bottom bridge 26 is provided integrally with the lower end of the steering stem 24.

The radiator 18 is located in front of the head pipe 16, facing toward the front of the vehicle body, and located in a plane substantially parallel to the axis of the head pipe 16.
6 is attached to the mounting frame 21 at a distance that allows the steering rotation of the front fork 4.

The details of this radiator 18 will be explained with reference to FIGS. 6 and 7. Water pipes 29 are provided horizontally in parallel between the right tank 27 and the left tank 28 to communicate them. A wavy heat dissipation plate 30 is provided in between, in contact with and fixed to the water guide pipe 29, and an inlet mouthpiece 31 is provided on the left tank 28 side, and an outlet side mouthpiece 32 is provided on the right tank 27 side.

Further, mounting screw holes 33 are provided in the upper portions of the side surfaces of the right tank 27 and the left tank 28, and an engagement pin 34 that protrudes laterally is fixedly provided in the lower portions. And the mounting frame 2
1, the mounting screw hole 33 is attached to a bracket 35 provided on the upper frame 21c by a bolt 36 screwed into the screw hole, and the engaging pin 34 is fixed to the lower frame 21a.
The radiator 18 is engaged with and attached to the semicircular notch 37a of the body via the rubber 38, and the radiator 18 is thus supported by the vehicle body frame 1 via the attachment frame 21.

In the embodiment, another radiator (hereinafter referred to as a lower radiator) 39 is attached to the down tube 14 at the rear and lower part of the radiator 18. This lower radiator 39 is provided separately to ensure heat dissipation capacity since the size of the upper radiator 18 alone is limited due to space limitations and the heat dissipation capacity is insufficient. 39 are communicated by tubes and form one circulation path to radiate heat from the engine cooling water.

Further, the meter unit 19 is disposed obliquely forward and upward from the upper part of the radiator 18, and is attached to the meter unit mounting portion 2 of the mounting frame 21.
It is attached to 1c. Meter unit 19
The details are shown in FIG. 40, 41, 42, 43
4 is a pointer type meter, and 44 is a mechanical digital display section.

The meter unit 19 is covered by a meter panel 45. This meter panel 45 is
It covers the meter unit 19, extends to the rear side above the radiator 18, and extends left and right to the sides of the meter unit 19 (this left and right extended portion is shown as 45a), and its peripheral edge is attached to the cowling 17. It touches the inside.

This meter panel 45 not only covers the meter, but also extends rearward and left and right as described above to cover the upper part of the radiator 18, so it has a heat shielding effect that blocks the heat radiation upward from the radiator 18. To protect the occupants from the hot air of the radiator 18.

The digital display section 44 will be explained as follows.
In FIG. 9 shown in enlarged form, 44a is a total distance display section, 44b is a trip distance display section, and 44a is a total distance display section;
C is a reset button for the trip distance display section 44b, and 44d is another digital display section. The surface plate 44c of the digital display section 44 is a transparent plastic plate, but the distance display sections 44a and 44b are made thinner as shown in FIG. Therefore, the displayed characters are very easy to read.

The headlight 20 is disposed in a space formed by the radiator 18 and the meter unit 19, which is approximately V-shaped in side view (it is a horizontal V-shape), and is attached to the headlight mounting portion 21d of the mounting frame 21. There is. In this way, by skillfully placing the headlight 20 in the V-shaped space formed by the radiator 18 and meter unit 19, these devices are packed together in an extremely compact manner, and the headlight 20 is cleverly placed in the V-shaped space formed by the radiator 18 and meter unit 19. This has the advantage of being significantly smaller.

To explain the details of the cowling 17, the cowling 17 covers the radiator 18, meter unit 19, headlight 20, etc., and extends rearward and downward on the left and right sides, and covers the sides of the front fork 4, the head pipe 16, and the main body. The frame 13, the down tube 14, and the front stay 46 cover the sides of the triangular portion at the front of the vehicle body frame.

This cowling 17 is opened above the headlight 20 and on both left and right sides to take in air to the radiator 18, and these openings, that is, air intakes 47 and 48, are provided with an upper grill 47a and left and right grills 48a, respectively. There is. The radiator 18 is disposed approximately midway between each air intake port 47, 48 and the head pipe 16.

In addition, the headlight 20 and the radiator 18
A radiator baffle plate 49 is provided above and below the meter unit 19. This radiator air guide plate (hereinafter simply referred to as the air guide plate)
As shown in FIGS. 11 to 13, the upper plate portion 49
a and left and right side wall portions 49b, and are attached so that their rear ends are continuous around the radiator 18 (the continuous portion on the upper plate portion 49a side is shown as 49e, and the continuous portion on the wall portion 49b side is shown as 49f). ), the tip is attached so as to be continuous with the inner surface of the cowling 17 around the headlight 20. Note that a seal member 50 is attached to the distal end portion 49g that is continuous with the inner surface of the cowling 17. In this way, the radiator baffle plate 49 forms a baffle plate 51 that effectively guides the outside air flowing in from the air intakes 47 and 48 to the radiator 18, and at the same time has a heat shielding effect that blocks heat from the radiator 18 and a meter unit. This provides a waterproof effect to prevent water from entering the meter unit 19 from below. As shown in FIG. 11, the baffle plate 49 is provided with circular notches 49c and 49d at the top and bottom of the rear end of the side wall 49b, and these notches 49c and 49d are connected to the radiator 18.
It fits into a bolt 36 and a locking pin 34 on the side surface of the radiator 18 via rubber, and is supported by brackets 35 and 37 together with the radiator 18. 49h is a notch in the exit side cap 32 portion, and 91i is a notch in the inlet side cap 31 portion.

Also, the part indicated by 49j is the mounting frame 2.
Bracket 5 fixed to the rising portion 21b of 1
7 (see FIG. 2) is a part that is fastened together with the headlight 20. Note that the bracket 5
Although the details are omitted, the front part 57a of 7 is the cowling 17.
It is considered to be a support part.

As mentioned above, the air guide plate 49 forms the air guide path 51, so that the wind flows in from the air intakes 47 and 48 as shown by the arrow C in FIGS. 2 and 4 and is efficiently transferred to the radiator 18. It is well guided and enhances the heat dissipation effect of the radiator 18.

Note that this baffle plate 49 and the above-mentioned meter panel 4
5 covers the upper part of the radiator 18 in a double layer, so that a space formed by the baffle plate 49 and the meter panel 45 is formed above the radiator 18, which has a heat shielding effect that blocks the heat of the radiator 18. is getting bigger.

Further, an air guide partition plate 52 is provided between the radiator 18 and the head pipe 16. As shown in FIG. 4, the wind guide partition plate 52 has a wall portion 52a that is approximately U-shaped when viewed from the top and allows the steering rotation of the front fork 4.
It has an upper plate portion 52b extending outwardly from the upper edge of the cowling 17 on the left and right sides, and the upper plate portion 52b is in contact with the inner surface of the cowling 17. An air exhaust port 17a is formed on the rear left and right side surfaces of the cowling 17, and the rear end of the wall portion 52a of the air guide partition plate 52 is connected to the rear edge of the air outlet 17a. 52 and the inner surface of the cowling 17 form an air guide path 53 that communicates from the rear surface of the radiator 18 to the air exhaust port 17a. Note that this air guide partition plate 52 has a recess 52c formed at the center of the front part.
is fixed with a bolt 55 to a bracket 54 fixed to the upper frame portion 21c of the mounting frame 21, and clamping claw portions 52d formed on the non-edge portion and expanding alternately inward and outward are attached to the mounting frame 21. It is attached to the vehicle body by pinching the lower frame part 21a and by pinching a mounting plate 46a provided on the side of the front stay 46 by a similar pinching claw part 52c formed at the lower end of the rear edge.

The air guide partition plate 52 guides the airflow that has passed through the radiator 18 to both left and right sides and discharges it from the air outlet 17a on the side surface of the cowling 17, thereby preventing the hot air that has passed through the radiator 18 from hitting the occupant. , which has the effect of significantly reducing air resistance. In other words, if the air is directly vented behind the radiator 18, the air resistance will be large due to various mounted items such as the engine 2, but as described above, the air guide path 53 is formed to direct the flow after the radiator as shown in FIG. As shown in the figure, since the air is guided as shown by arrow D and smoothly extracted from the exhaust port 17a as shown by arrow E, the air resistance against the vehicle body is reduced.

The radiator 18 protrudes downward from the opening 17b on the lower surface of the cowling 17 in order to obtain the desired heat dissipation ability. 56 is attached. The guide vanes 56a forming the front surface of the under radiator cover 56 are open only at the front surface of the radiator 18, and are present below and on both left and right sides of the radiator 18, and form concave surfaces with a smooth curvature to guide the wind upward. . Lower surface 56 of under radiator cover 56
b is substantially horizontal, and a rectifying blade 56c with a smooth curvature and slightly downwardly directed so as to guide the traveling wind toward the lower radiator 39 is formed at the rear end.

Due to the presence of the under radiator cover 56, the running wind is guided by the guide vanes 56a and flows from the opening 17b (ie, the air intake) toward the upper radiator 18 as shown by arrow A. Therefore, compared to the case where the under radiator cover 56 is not provided, a large amount of traveling wind is taken into the radiator 18, and the wind catching efficiency is significantly improved. Further, the flow along the lower surface 56b of the under radiator cover 56 is guided by the straightening blades 56c, directed downward as shown by arrow B, and guided to the lower radiator 39, thereby enhancing the heat dissipation effect of the lower radiator 39.

Further, the radiator 18 is disposed approximately midway between the air intake ports 47 and 48 of the cowling 17 and the head pipe 16, and is spaced apart from the head pipe 16 by a predetermined distance. By forming the (wakestream) air guide path 53 in the cowling 17,
The cooling air flowing from the air intake ports 47 and 48 through the radiator 18 becomes extremely smooth, and cooling efficiency is improved. Furthermore, when driving in the rain, most of the muddy water splashed upward by the front wheels 3 is removed from the air intake port 47 and the headlight 20.
It is not blocked by the front end of the cowling 17 in the lower part of the cowling 17 and does not enter the cowling 17. Therefore, there is no risk that the inside of the cowling 17 will be contaminated by muddy water or that the radiator 18 will be covered with muddy water and become clogged, and good cooling performance can be maintained over a long period of time. Furthermore, the radiator 18 has the advantage of increasing the degree of freedom in design, such as being able to be made smaller due to improved cooling efficiency.

As explained above, according to the radiator installation structure for a two-wheeled vehicle of the present invention, in a two-wheeled vehicle in which a front fork that supports the front wheel is rotatably supported on a head pipe that constitutes a part of the body frame, the radiator is mounted above the front wheel. A cowling having an air intake formed above the front end of the cowling is disposed to surround the head pipe, and a radiator is installed at a predetermined distance from the head pipe at a position approximately midway between the air intake and the head pipe in the cowling. is placed toward the front of the vehicle,
Since the radiator is supported by a mounting frame fixed to the head pipe and extending toward the front of the vehicle body, the following effects are achieved.

That is, the flow downstream of the radiator flows smoothly without being obstructed by the head pipe, improving the cooling efficiency of the radiator, making the radiator more compact, and increasing the degree of freedom in designing the radiator. Further, since the radiator is fixed to the vehicle body frame via the mounting frame, the inertial weight around the steering axis is reduced, and the steering operation becomes easier.

In addition, most of the muddy water splashed up by the front wheels does not enter the cowling due to the front end of the cowling, which prevents the muddy water from clogging the radiator, which allows the radiator to maintain good cooling performance over a long period of time. Retained over a period of time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the two-wheeled vehicle, Fig. 2 is a side view of the main parts, Fig. 3 is a front view of the main parts, and Fig. 4 is a side view of the main parts. 5 is a perspective view of the mounting frame, FIG. 6 is a front view of the radiator, FIG. 7 is a side view of the same, FIG. 8 is a view of the meter unit section in FIG. 2, Fig. 9 is an enlarged view of the digital display section in Fig. 8, and Fig. 10 is an enlarged view of the digital display section in Fig. 9.
11 is a side sectional view of the radiator baffle plate, FIG. 12 is a plan view thereof, and FIG. 13 is a front view thereof. 1... Body frame, 4... Front fork, 9... Steering handle, 13... Main frame, 14... Down tube, 16...
Head pipe, 17...Cowling, 18...Radiator, 19...Meter unit, 20...Headlight, 21...Mounting frame, 21a...
...Lower frame part, 21b...Rising part, 21c...
Meter unit mounting part, 21d...Headlight mounting part, 21e...Upper frame part, 21f...Mounting plate part, 21g...Mounting plate part, 24...Steering stem, 45...Meter panel, 47...
Air intake, 49... Air intake, 52
...Air guide partition plate, 56...Under radiator cover.

Claims (1)

[Claims for Utility Model Registration] (1) In a two-wheeled vehicle in which a front fork supporting a front wheel is rotatably supported on a head pipe that constitutes a part of the vehicle body frame, a front fork that supports the front wheel is provided above the front wheel so as to surround the head pipe. A cowling having an air intake formed above the front end thereof is disposed, and a radiator is positioned approximately midway between the air intake and the head pipe within the cowling, and is spaced a predetermined distance from the head pipe so as to face the radiator toward the front of the vehicle body. A radiator installation structure for a two-wheeled vehicle, characterized in that the radiator is supported by a mounting frame fixed to the head pipe and extending toward the front of the vehicle body. (2) The radiator installation structure for a two-wheeled vehicle according to item 1, wherein the radiator is arranged in a plane substantially parallel to the axis of the head pipe.