JPH11278344A - Motorcycle cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling efficiency of side radiators by opposing winds. SOLUTION: A water-cooled two-stroke V-engine is provided on its front with an intake box 12, on either side of which a side radiator 15 is installed. The forward portion of a vehicle body including the engine, intake box 12 and side radiators 15 is covered in a front cowl 17 that is formed with exhaust ports 18 in its sides facing the side radiators 15 and with an inlet port 30 in its front. The front face of the intake box 12 placed behind the inlet port 30 is shaped into a baffle curved surface 36 that guides opposing winds W to the left and right side radiators 15. A space 45 formed between the intake box 12 and the side radiator 15 is closed by a shielding plate 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle provided with a radiator (hereinafter, this type of radiator is referred to as a side radiator) disposed substantially parallel to the center of the vehicle body to the side of the vehicle body. The present invention relates to a device for improving cooling efficiency.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 9-240547 discloses a motorcycle in which a side radiator is disposed on the side of a water-cooled engine and cooled by a cooling fan disposed inside the side radiator. It is shown.

[0003]

By the way, in the case of a general commercial vehicle, if the cooling fan is used as described above, it is easy to obtain a sufficient cooling efficiency for the side radiator. However, in a vehicle premised on high-speed running such as a race specification vehicle, it is more effective to effectively use the traveling wind at the time of high-speed running than using such a cooling fan,
It is also desirable in terms of reducing the size and weight of the vehicle body. Then, this invention aims at realizing sufficient cooling performance by running wind.

[0004]

In order to solve the above-mentioned problems, a motorcycle cooling device according to the present invention has a side radiator disposed in front of a water-cooled engine and sideways of a vehicle body in substantially parallel with the center of the vehicle body. Along with the front cowl, the outside of the side radiator is covered with a front cowl from the front of the vehicle body, and a wind guide port is provided on a front surface of the front cowl in a motorcycle having an exhaust port at a position overlapping the side radiator on the side of the front cowl. At the position inside the front cowl behind the wind guide port and overlapping the side radiator when viewed from the side, a wind guide member having a curved surface that is convex forward to guide the running wind to the side radiator on the side is provided, and the wind guide member and the side A space formed between the radiator and the radiator is closed by a shielding member.

[0005]

The traveling wind taken in from the air guide port during high-speed traveling is guided by the curved surface of the wind guide member disposed behind the air guide port, flows sideways, and is guided to the side radiator. At this time, since the space between the wind guide member and the side radiator is closed by the shielding member, the traveling wind reaching the side radiator
The vehicle passes through the side radiator without passing backward between the air guide member and the side radiator, and passes through the exhaust port on the side surface of the front cowl to the side of the vehicle body. Therefore, a sufficient amount of traveling wind in contact with the side radiator can be secured, and the cooling efficiency can be improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment applied to a motorcycle of racing specification will be described below with reference to the drawings. FIG.
Is a schematic cross-sectional view taken along line 1-1 in FIG. 4 showing a flow of traveling wind, FIG. 2 is a side view of an external appearance of a motorcycle to which the present embodiment is applied, and FIG. 3 is a view excluding a front cowl and a side radiator. FIG. 4 is a partially cutaway front cowl showing the relationship between a front cowl, a side radiator, and a wind guide member, and FIG. 5 is a front cowl and a wind guide from the front of the vehicle body. It is a figure which shows the relationship between a member and a side radiator.

First, an outline of the motorcycle will be described with reference to FIGS. This motorcycle is a race-specification vehicle equipped with a water-cooled two-stroke engine. The engine 1 is supported below a pair of main frames 3 extending rearward while expanding left and right from a head pipe 2. 3, a first engine hanger 4, a second engine hanger 5, and a third engine hanger 6 are provided in this order from the front side (FIG. 3).

At the rear of the crankcase 7 of the engine 1,
The front end of the rear swing arm 9 is directly supported via a pivot shaft 8 so as to be rotatable in the vertical direction. Engine 1
The upper bank cylinder 10 and the lower bank cylinder 11 form a V-shape that opens upward and downward toward the front, and an intake box 12 is arranged in this V-shape space.

The intake box 12 accommodates a carburetor (not shown) therein and is supported by a stay 14 below a portion of the main frame 3 near the head pipe 2. Further, a pair of side radiators 15 are provided on both left and right sides of the vehicle body with the intake box 12 interposed therebetween, and are supported below the main frame 3 by stays 16 (FIG. 3).

A front portion of the vehicle body including the sides of the engine 1, the intake box 12 and the side radiator 15 is covered with a front cowl 7, and the side of the front cowl 7 is located at a position overlapping the side radiator 15 in a side view. An air outlet 18 is provided, and a small air outlet 19 is formed at a position below the side radiator 15 and on the side of the lower bank cylinder 11.

In the drawing, reference numeral 20 denotes a front wheel, 21 denotes a front fork, 22 denotes a fuel tank, 23 denotes a seat, 24 denotes a rear frame also serving as a seat rail, 25 denotes an exhaust pipe, 26 denotes a muffler, and 27 denotes a rear wheel suspension. A rear cushion unit, 28 is a rear wheel, 29 is a step bracket, and 29a is a step.

Next, the cooling structure of the side radiator will be described. As is clear from FIGS. 1, 4 and 5, the front cowl 17 has a wind guide opening 30 in the front thereof, and the intake box 12 is disposed inside the wind guide opening 30.

As shown in FIG. 4, upper and lower portions of the front cowl 17 facing the air guide port 30 are tapered guide slopes 31 and 32 toward the intake box 12. As shown in FIG. 1, an inner side surface 33 facing the air guide port 30 is folded back into the air guide port 30, and accommodates a front portion of the side radiator 15 inside the inside.

The intake box 12 is a known device for applying traveling wind pressure to a carburetor to pressurize fuel with traveling wind.
An intake port 35 (FIG. 5) is provided in the upper part of the front surface, and the front side forms a curved air guide surface 36, and is formed into a curved surface that smoothly turns from the front side to the side. It has the function of a wind member. Lower 3
Reference numeral 7 projects forward and sideways.

The side radiator 15 has a substantially rhombic shape in a side view, and is disposed substantially parallel to the center of the vehicle body between the intake box 12 and the inner surface of the front cowl 7, and its outer surface is covered with the front cowl 17. At the same time, the inside face is 3
You are facing 0. Reference numeral 40 denotes a tank portion of the side radiator, and 41 denotes a main body portion.

As is apparent from FIG. 1, the outer surface of the rear half of the main body 41 faces the exhaust port 18. Furthermore, the main body 4
A rear end 43 of the shielding plate 42 is wrapped around the rear of the unit 1 and is integrated by welding or the like, and a front end 44 extends forward in parallel with the inner surface with a space therebetween, and is in contact with the side surface of the intake box 12. .

The shielding plate 42 closes a space 45 between the intake box 12 and the side radiator 15.
As is apparent from the front view of FIG. 5, the vertical direction extends substantially the same as the vertical width of the side radiator 15 and closes almost the entire gap between the intake box 12 and the side radiator 15 that overlaps the air guide port 30. I have.

Next, the operation of this embodiment will be described. In FIGS. 1 and 4, when the vehicle travels at high speed, the traveling wind W is taken into the air introduction port 30, guided by the guide slopes 31 and 32, the inner side surface 33, and the like, and heads toward the intake box 12.

When reaching the front surface of the intake box 12, the front surface of the intake box 12 is a curved curved surface 36, and is guided by the curved surface 36 to turn left and right to be guided to the side radiator 15 on the side. Here side radiator 1
After being sufficiently cooled while passing while contacting with the air outlet 5, the air is discharged from the air outlet 18 to the outside.

At this time, the running wind W is smoothly and efficiently guided to the side radiator 15 by the wind guide curved surface 36 of the intake box 12. In addition, since the space 45 is closed by the shielding plate 42, it is not possible to pass backward through the space 45, and the traveling wind W flowing to the rear in the space 45 also passes through the side radiator 15 and the exhaust port 18 etc. It comes out to the side of.

Therefore, the cooling efficiency of the side radiator 15 can be improved. Moreover, intake box 1
Since 2 also serves as a wind guide member, it is not necessary to provide a special wind guide member, so that the vehicle body structure can be simplified and an increase in the number of parts can be suppressed. In addition, since it is not necessary to use a cooling fan, it is possible to contribute to a reduction in the size and weight of the vehicle body, which is suitable for a race specification vehicle.

The air guide member is not limited to the intake box 12, but can be designed in various ways. For example, when the intake box 12 is not provided, a dedicated air guide plate may be provided. Further, the shielding plate 42 may be supported on the side of the intake box 12. In this case, the shielding plate 42 can be formed separately from or integrally with the intake box 12.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view taken along the line 1-1 of FIG.

FIG. 2 is an external side view of a motorcycle to which the embodiment is applied.

FIG. 3 is a side view of a main part of a body frame portion.

FIG. 4 is a diagram showing the front cowl with a portion cut away from the side.

FIG. 5 is a diagram showing the cooling device from the front of the vehicle body;

[Explanation of symbols]

1: engine, 12: intake box, 15: side radiator, 17: front cowl, 18: exhaust vent, 30: vent, 36: wind curved surface, 42: shielding plate, 45: space,

Claims (1)

[Claims] A radiator is disposed in front of a water-cooled engine and sideward of a vehicle body in substantially parallel with the center of the vehicle body, and the outside of the radiator is covered with a front cowl from the front of the vehicle body, and overlaps with a radiator on a side surface of the front cowl. In a motorcycle provided with an exhaust port at a position, a wind guide port is provided on the front surface of the front cowl, and a curved surface convex forward is provided at a position inside the front cowl behind the wind guide port and overlapping with the radiator in side view. A cooling device for a motorcycle, comprising: a wind guide member for guiding traveling wind to a side radiator; and a space formed between the wind guide member and the radiator closed by a shielding member.