JPH08198163A - Construction of radiator passing air flow route in motorcycle - Google Patents

Abstract

PURPOSE: To improve cooling performance of a radiator by reducing an air resistance in running phase and also increasing a passing air flow quantity of the radiator by forming a laminator flow behind a vehicle in a motorcycle. CONSTITUTION: In a motorcycle 20, a pair of left and right duct parts 16a, 16a for guiding a radiator passing air flow to the front end of a tail cowl 14 and a pair of bellows-like left and right hose parts 16b, 16b are provided between a radiator 12 and the front end of the tail cowl 14, and a cavity part 18 connected to the rear end parts of the hose parts 16b, 16b by opening at both front and rear ends of the tail cowl 14, and discharging radiator passing air flow from the rear end opening 14b of the tail cowl 14 to the back side of a vehicle is formed in the tail cowl 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passage structure for a radiator passing wind in a motorcycle.

[0002]

2. Description of the Related Art Generally, in a motorcycle, aerodynamics against a headwind during traveling is regarded as important. Specifically, the air resistance during traveling is reduced by mounting a cowl of a predetermined shape that rectifies the traveling wind on the vehicle body and devising the outer surface shape of the helmet.

[0003]

However, as shown in FIG. 6, the conventional motorcycle has the following problems. That is, the airflow F3 in the upper layer of the vehicle during traveling is such that the front cowl a is grabbed and rises, and then the helmet, the driver's back, and the tail cowl b.
The air flows along the rear upper surface b1, but when the air flow F3 separates near the trailing edge of the tail cowl b, a backflow occurs due to this separation, and a negative pressure turbulent flow accompanied by a vortex is formed behind the tail cowl b. Will occur. Therefore, there has been a problem that the air resistance at the rear part of the vehicle increases.

On the other hand, a part of the air flow in the lower layer passes through a radiator d arranged in front of the engine c, but this passing wind is discharged as it is toward the rear of the vehicle. It is difficult for the air flow F3 to be rectified. Further, the amount of air passing through the radiator also depends on the speed of the traveling wind and the area of the front surface of the radiator d, and no means for efficiently discharging the radiator air is provided.

The present invention has been made in view of the above-mentioned problems of the conventional motorcycle. The present invention reduces the air resistance during traveling by forming a laminar flow behind the vehicle, and also allows the radiator to pass through. An object of the present invention is to provide a passage structure for a wind passing through a radiator in a motorcycle, which increases the air volume to improve the cooling performance of the radiator.

[0006]

The present invention has the following configuration to achieve the above object. That is, the present invention is directed to a head pipe that steerably supports front wheels, a fuel tank provided behind the head pipe, a seat provided behind the fuel tank, and a seat provided below the fuel tank. A motorcycle provided with an engine, a radiator arranged on the front side of the engine, and a tail cowl covering the rear part of the vehicle body around the seat, the radiator is provided between the radiator and the front end of the tail cowl. A passage is provided for guiding the passing wind that has passed through to the front end of the tail cowl, and the tail cowl is opened at both front and rear ends of the tail cowl and communicates with the passage, and is introduced from the front end of the tail cowl. In a motorcycle, a cavity is formed for discharging the radiator passing wind from the rear end opening of the tail cowl toward the rear of the vehicle. A passage structure of Jieta air passing through.

[0007]

According to the present invention, the wind passing through the radiator is guided from the radiator to the front end of the tail cowl by the passage, and then discharged to the rear of the vehicle from the rear end opening of the tail cowl through the hollow portion of the tail cowl. To be done. Therefore,
The upper-layer airflow flowing along the tail cowl joins the airflow discharged from the rear end opening of the tail cowl, so that a negative pressure turbulent flow accompanied by a vortex is not generated behind the tail cowl. .

Further, since the radiator passing air is discharged to the rear of the tail cowl where the negative pressure is generated, the radiator passing air is sucked out from the cavity due to the negative pressure. Will increase compared to the past.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a road racer type motorcycle having a single cylinder engine. FIG. 1 is a side view of the motorcycle according to this embodiment. FIG. 2 is a plan view of the motorcycle according to this embodiment, showing a state in which the fuel tank is removed. FIG.
FIG. 3 is a sectional view taken along line III-III in FIG. 4 is shown in FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 shows V in FIG.
It is a -V sectional view.

As shown in FIGS. 1 and 2, the motorcycle 20 according to the present embodiment has a head pipe 4 for supporting the front wheels 2 in a steerable manner, and a fuel tank 6 provided behind the head pipe 4. A seat 8 arranged behind the fuel tank 6 and an engine 10 arranged below the fuel tank 6.
And a radiator 12 arranged in front of the engine 10.
And a tail cowl 14 that has an upper surface 14a on the rear side of the seat 8 and covers the rear part of the vehicle body around the seat 8.

The passage structure for the radiator passing wind in the motorcycle 20 is constructed as follows. That is, between the radiator 12 and the front end of the tail cowl 14, there are provided passages 16 and 16 for guiding the passing wind that has passed through the radiator 12 to the front end of the tail cowl 14, and the tail cowl 14 has openings at its front and rear ends. And passage 16,16
The radiator passing wind introduced from the front end of the tail cowl 14 to the rear end opening 14b of the tail cowl 14.
A hollow portion 18 is formed to discharge from the vehicle toward the rear of the vehicle.

The configuration of each part of this embodiment will be described in detail below. The head pipe 4 includes a pair of upper and lower brackets 22.
u, 22d and a pair of left and right front forks 24, 2
The front wheels 2 are supported via 4 so as to be steerable. The fuel tank 6 has a pair of left and right main frames 26 that are welded to the left and right side surfaces of the head pipe 4 and extend rearward and downward.
It is mounted and fixed on 26. Further mainframe 2
A pair of left and right seat rails 28, 28 extend rearward from the rear portions of the seats 6, 26, respectively, and support the tail cowl 14. The motorcycle 20 is equipped with a front cowl 30 which covers the front of the head pipe 4 and the left and right sides of the front of the vehicle body.

The engine 10 is located directly below the fuel tank 6 and has a cylinder 10a, which is slightly inclined forward, at the front portion. The radiator 12 is provided in front of the cylinder 10a and slightly below the head pipe 4 and is tilted forward at substantially the same angle as the forward tilt angle of the cylinder 10a. The radiator 12 has a substantially rectangular shape that is long in the vehicle width direction when viewed from the front of the vehicle, takes in the traveling wind from the front and allows it to pass, and transfers the heat of the cooling water flowing inside to the passing air. Water is cylinder 10a
By circulating the inside and the radiator 12, the cylinder 10a is cooled to a desired state.

The tail cowl 14 is a cover body that covers the left and right sides of the rear portion of the vehicle body and the upper portion of the vehicle body behind the seat 8, and has a cross section of a substantially inverted U shape and is made of a synthetic resin molded product. It is a thing. Tail cowl 14
The rear upper surface 14a is located at a position higher than the front portion on which the seat 8 is placed, and is a smooth surface formed almost horizontally from around the waist of the driver.

Further, the tail cowl 14 has a hollow double structure consisting of an inner member 14c and an outer member 14d. As shown in FIG. 4, the front portion on which the seat 8 is placed has left and right side portions. While the cavities 18a, 18a are formed in each of them, as shown in FIG. 5, the rear part is configured to be hollow over the entire inverted U-shaped cross section. Therefore, the cavity 18 is formed by the front left and right cavities 1.
The channels 8a and 18a are formed as a substantially Y-shaped flow path in a plan view so that they merge at the rear portion. In this embodiment, the tail cowl 14 has a double structure including the inner member 14c and the outer member 14d in order to form the hollow tail cowl 14, but the present invention is not limited to this, and the tail cowl 14 is blown. A single synthetic resin molded product molded into a hollow structure by molding or rotational molding may be adopted.

As shown in FIGS. 1 and 2, the passages 16 and 16 have a front end opening connected to the radiator 12 and a pair of left and right duct portions 16a having a substantially U-shaped transverse cross section. , 16a and the pair of left and right duct parts 1
A pair of left and right bellows-shaped hose portions 16b, 1 interposed between the rear ends of the cavities 6a, 16a and the front ends of the cavities 18a, 18a.
6b and mainly.

As shown in FIGS. 2 and 3, the duct portions 16a, 16a are independently provided on the left and right sides of the cylinder 10a, and extend from the rear surface of the radiator 12 through the insides of the main frames 26, 26. The passage is such that the passage area gradually decreases toward the upper rear portion of the engine 10 as it goes rearward. Also, the left and right duct portions 16a, 1
Each of the opening edges of the front end of 6a is connected to the radiator 12 so as to surround the left and right halves of the rear surface of the radiator 12, and at the same time, the joint between the duct portions 16a, 16a and the radiator 12 is covered with a sealing member 16a1 such as a sponge. Has been done. As a result, almost all the air that has passed through the radiator 12 is guided to either of the left and right duct portions 16a, 16a.

According to the present embodiment having the above-described structure, as shown in FIG. 1, a part of the lower layer air flow in the vehicle is taken into the radiator 12 from the front surface of the radiator 12. Then, the passing air coming out from the rear surface of the radiator 12 is, as shown in FIG.
a, 16a, the duct parts 16a, 16a
The left and right sides of the cylinder 10a are guided to the left and right of the front end of the tail cowl 14 by independent passages by the a and the hose portions 16b and 16b. Then, the radiator passing winds flowing through the left and right passages 16, 16 merge with each other at the rear portion of the tail cowl 14 through the cavities 18a, 18a, respectively, and then to the outside from the rear end opening 14b of the tail cowl 14 toward the rear of the vehicle. It is discharged and becomes an air flow F1.

On the other hand, as shown in FIG. 1, the upper-layer airflow F2 flows along the front surface of the front cowl 30, the helmet of the driver, the back of the driver, and the upper surface 14a of the tail cowl 14 as in the conventional case. In the present embodiment, since the upper-layer airflow F2 joins the airflow F1 from the rear end opening 14b of the tail cowl 14, a negative pressure turbulent flow accompanied by a vortex is generated behind the tail cowl 14. Will disappear. Therefore, a laminar flow is formed behind the tail cowl 14, and air resistance during traveling is reduced.

Further, in the present embodiment, a negative pressure is generated behind the tail cowl 14 by the upper layer air flow F2 having a high flow velocity, and the radiator passing air is discharged to this negative pressure generating portion. Are sucked out of the cavity 18 by the negative pressure. As a result, the amount of air passing through the radiator is increased with the suction action, and the cooling performance of the radiator 12 is further improved.

Further, in this embodiment, the duct portions 16a, 16a, 1
A bellows-shaped hose portion 1 between 6a and the cavities 18a, 18a
Since 6b and 16b are interposed, the vibration of the duct portion 16a or the tail cowl 14 during traveling is absorbed as the deformation amount of the hose portions 16b and 16b, and the damage of the joint portion in the passage 16 is prevented. You can also

The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.

[0023]

As described above, according to the present invention, it is possible to form a laminar flow behind a vehicle and reduce air resistance during traveling. In addition, the cooling performance of the radiator can be improved by increasing the amount of air passing through the radiator.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle according to this embodiment.

FIG. 2 is a plan view of the motorcycle according to the present embodiment,
It shows a state in which the fuel tank is removed.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a side view of a motorcycle according to a conventional example.

[Explanation of symbols]

 2 Front Wheel 4 Head Pipe 6 Fuel Tank 8 Seat 10 Engine 12 Radiator 14 Tail Cowl 14b Tail Cowl Rear End Opening 16 Passage 16a Duct 16b Hose 18 Cavity 20 Motorcycle

Claims (1)

[Claims] 1. A head pipe for supporting front wheels in a steerable manner, and a fuel tank provided behind the head pipe,
A seat arranged behind the fuel tank, an engine arranged below the fuel tank, a radiator arranged in front of the engine, and a tail cowl covering a rear part of the vehicle body around the seat. In the motorcycle, between the radiator and the front end of the tail cowl,
A passage is provided for guiding the passing wind that has passed through the radiator to the front end of the tail cowl, and the tail cowl communicates with the passage by opening at the front and rear ends of the tail cowl, and from the front end of the tail cowl. A radiator passage wind passage structure in a motorcycle, wherein a cavity is formed to discharge the introduced radiator passage wind from a rear end opening of the tail cowl toward the rear of the vehicle.