JPS58202173A - Windshield device for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a windshield screen structure attached to the front part of a motorcycle body.

For competition motorcycles or high-performance practical motorcycles,
As shown in FIG. 1, a cowling (hereinafter referred to as a windshield screen) S with a waterdrop-shaped surface is often provided near the steering head to reduce air resistance.

By the way: When the water droplet type windshield screen S is used, as shown in Fig. 2, when driving at high speed, the airflow A on the upper surface of the windshield screen is smoothly guided backward by the rider's helmet H, reducing air resistance. Although it is
On the other hand, there is a problem in that the air pressure on the upper surface of the windshield screen is relatively reduced due to the venturi effect accompanying the increase in the flow velocity of the airflow A.

In order to suppress this pressure drop, a windshield screen S1 having a shape as shown in FIG. 3, for example, can be considered. The upper part of the windshield screen S1 is in the form of a strip (its vertical cross section is approximately linear), and the upper surface airflow B of the windshield screen is directed upward, and at the same time as the flow velocity decreases, a vortex wCC is generated. In this way, low pressure can be suppressed, but this means that air resistance increases.

As described above, with known windshield screens, it is relatively difficult to suppress the drop in atmospheric pressure and reduce air resistance at the same time.

The present invention solves the above problem by forming a double windshield screen in the upper part of the cowling and providing ventilation holes in the front screen.

Therefore, an object of the present invention is to reduce air resistance in a windshield screen, suppress low pressure F, and improve aerodynamic characteristics.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 8.

The motorcycle 1 is provided with a windshield screen 3 extending from the upper front of the vehicle body to both sides of the heavy body (see FIG. 4). The front part of the windshield screen 3 has a water drop shape surrounding the front or side of the steering head 2, and includes a transparent first outer screen 4 and a second inner screen 5 extending upward. The first screen 4 is fixed by a plurality of rivets 6 along the U-shaped upper edge of the screen 3 on the main body side, and the second screen 5 is attached at a lower position than the main body side screen 3. It is fixed along the U-shaped inner wall surface of the side screen 3 with a plurality of rivets 7 (see FIGS. 5 to 7).

Thus, the first screen 4 is formed into a band-like shape similar to the windshield screen B shown in FIG.
is shaped like a water droplet, similar to the windshield screen S shown in FIG.

Further, on the front surface of the windshield screen 3, a plurality of ventilation holes 3a are formed in a portion sandwiched between both screens 4.5.

In the above configuration, when driving, the airflow B flowing upward along the first screen 4 suppresses a drop in air pressure, and the airflow A having a high velocity flowing backward along the second screen 5 through the ventilation holes 3a suppresses a drop in air pressure. As a result, the pressure increase on the top surface of the screen is suppressed, and the air resistance is reduced (see FIG. 8).

In addition, by modifying the above embodiment, 1 main body side windshield screen 3
Even if the second screen 3A is formed by extending the second screen 3A upwardly, and a plurality of ventilation holes 4a are formed near the fixed portion of the first screen 4, the same effect n can be obtained. In this case, since the first main body side windshield screen 3 and the second screen 3A are integrally molded, the manufacturing cost is lower than that of the above embodiment, and the number of assembly balls can be reduced (see Fig. 9). )・
1 Furthermore, the second screen in the above embodiment is
Aerodynamic characteristics required for the windshield screen (cowling)
It is necessary to change the angle of inclination depending on air resistance and atmospheric pressure drop, and when the inclination is made deeper, the visibility of instruments such as a tachometer can be ensured by the configurations of both embodiments below.

In other words, in FIGS. 1O to 12, the center part of the upper surface of the z-15 has a convex portion bulging outward.
5a, and a meter IO is disposed inside the convex portion +5a. This meter 10 is supported by a screen support stay 2a fixed to the steering head 2 via a meter stay 2b.

In addition, in FIGS. 13 to 15, a meter is attached to the center of the upper surface of the second screen B.

Even if the slope of the second screen is deepened in this way, the meter P can be made easier to see by modifying the shape of the second screen or by modifying the mounting position of the meter.

As is clear from the description of each embodiment, in the present invention, the windshield screen is provided with ventilation holes, and another windshield screen is placed behind the windshield screen (71, i), so that the front surface having the ventilation holes when driving is The airflow that flows upward through the side windshield screen suppresses the low pressure F on the top surface of the screen, and furthermore, the airflow that flows through the ventilation holes to the side of the other windshield screen and backward along the same surface suppresses the screen. The pressure increase on the top surface is moderately suppressed, and air resistance is reduced. As described above, according to the present invention, aerodynamic characteristics can be effectively improved with a simple C# configuration.

[Brief explanation of the drawing]

Figure 1 is a side view of a known motorcycle with a full cowling, Figure 2 is an explanatory diagram showing airflow conditions when the motorcycle is running, and Figure 3 is when a motorcycle equipped with a terrain-shaped windshield screen is running. FIG. 4 is a side view of a motorcycle equipped with a windshield screen according to an embodiment of the present invention; FIG. 5 is an explanatory diagram of main parts as viewed from the line ■-V in FIG. 4; Figure 6 is a cross-sectional view along the Vl-Vl line in Figure 5, Figure 7 is a cross-sectional view along the Vll-Vll line in Figure 5, Figure 8 is an explanatory diagram showing the airflow state during the same run, and Figure 9 is a cross-sectional view along the Vll-Vll line in Figure 5. Vertical side view 1 of the windshield screen according to the example of
0 is a longitudinal sectional side view of a windshield screen according to another embodiment, FIG. 11 is a view taken along the line XI-M in FIG. 10,
FIG. 12 is an explanatory diagram of the main part cut along the ■-Xll line in FIG. 10, FIG. 13 is a longitudinal cross-sectional side view of a windshield screen according to another embodiment, and FIG. 14 is an MV-XI diagram in FIG. 13.
15 is an explanatory view of the main part taken along the line XV-XV in FIG. 13. 1...fil to self 11, 2...steering head, 3...windshield screen, 3a...ventilation hole, 3A
...Second screen, 4...First screen, 4a
... Vent hole, 5... No. varnish clean, 6... Rivet, 7... Rivet, 10... Meter, 15... Second screen, 15a... Convex part, addition.
...meter, 5...second screen, A, B...airflow, C...vortex, S...windshield screen. Agent Patent Attorney Ehara Bogai 1ri, 2nd figure, fan 3rd figure, 4th figure, 5th figure, 6th figure, et al. Figure 14

Claims (1)

[Claims] A motorcycle windshield device 0, characterized in that a motorcycle is equipped with a windshield screen near the steering head, and the windshield screen is provided with ventilation holes, and another windshield screen is provided behind the windshield screen.