JP2003291651A - Noise reduction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce wind noises generated as a vehicle travels by using a simple structure. <P>SOLUTION: The weatherstrip 10 for supporting a windshield 7 is attached to a front window frame opening collar 6 formed from a roof 3 of the vehicle to a front pillar. An end part of a lip 9 of the weatherstrip 10 contacts with the roof 3 and an outer surface of the front pillar and a second lip 11 for protruding toward outside of a vehicle body at a front side of the vehicle which is front to the first lip 9 is integrally formed with the weatherstrip 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing wind noise caused by running a vehicle.

[0002]

2. Description of the Related Art In a conventional vehicle, for example, a cab-over vehicle, the traveling wind that hits the entire front surface 2 of the cab 1 along the outer surface of the cab 1 during high-speed traveling is schematically illustrated in FIG. When flowing to the rear of the vehicle, the flow velocity at the connecting corner portion of the front face 2 of the cab 1 to the roof 3 and the side face 4 is large, and particularly to the flow velocity toward the upper rear as shown by the arrow A near the top of the front pillar 5. Is big.

On the other hand, the window frame opening edge portion 6 of the cab 1 formed from the roof 3 to the front pillar 5 has a structure shown in FIG.
As described above, the weather strip 8 for holding the windshield 7 is attached, and the ends of the lip 9 are in contact with the outer surfaces of the roof 3 and the front pillar 5. However, the traveling wind is applied to the outer surface of the weather strip 8. There is a problem that a strong turbulent flow such as a vortex B is generated when flowing along the rear side of the vehicle, and the wind noise increases as the vehicle speed increases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the wind noise generated by the running of a vehicle with a simple structure.

[0005]

Therefore, the noise reduction device according to the present invention is provided on a weather strip attached to an opening edge portion of a front window frame of a vehicle and holding a windshield, on an outer surface of the opening edge portion of the window frame. And a second lip projecting outward from the vehicle body on the vehicle front side with respect to the first lip.
A lip is formed, and the second lip extends from an upper portion of the window frame opening edge portion to a side portion.

That is, since the second lip protruding outward from the vehicle body is formed on the weather strip on the vehicle front side from the first lip whose end portion abuts on the outer surface of the window frame opening edge portion, the weather strip is formed.
When the traveling wind that hits the front surface of the vehicle while traveling of the vehicle flows toward the rear of the vehicle along the outer surface of the vehicle, the traveling wind is guided to the outside of the vehicle body by the second lip and separated from the outer surface of the vehicle toward the rear of the vehicle. Since the turbulent flow as in the conventional case can be suppressed, the generation of wind noise can be easily reduced, and the second lip has a very simple structure. It is possible to easily form the second lip.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below by assigning the same reference numerals to parts equivalent to those of the conventional device.

1 and 3, a weather strip 10 holding a windshield 7 is attached to a window frame opening edge portion 6 of a cab 1 formed from a roof 3 of a cab-over vehicle to a front pillar 5. The ends of the lips 9 of 10 are in contact with the outer surfaces of the roof 3 and the front pillar 5, and the second lips 11 projecting outward of the vehicle body on the vehicle front side of the lips 9 are formed integrally with the weather strip 10. The lip 11 extends from the upper portion of the window frame opening edge portion 6 to the side portion.

That is, consider the following four cases as an example. (A) When the lip 11 is formed over the entire upper portion of the window frame opening edge portion 6 and reaches both sides of the window frame opening edge portion 6, (b) The lip 11 is formed over the entire upper portion of the window frame opening edge portion 6. And (c) the lip 11 is formed over the upper part of both sides of the window frame opening edge part 6 and (c) the entire upper part of the window frame opening edge part 6 and both side parts of the window frame opening edge part 6. (D) When the lip 11 is formed over the entire upper portion of the window frame opening edge portion 6 and both side portions of the window frame opening edge portion 6.

In each of these cases, when the traveling wind that hits the entire front surface 2 of the cab 1 flows toward the rear of the vehicle along the outer surface of the cab 1 when the cab-over vehicle travels at high speed,
In the portion where the lip 11 is formed on the weather strip 10, the traveling wind is guided to the outside of the vehicle body by the lip 11 and separated from the outer surface of the vehicle body as shown by an arrow C in FIG. Therefore, it is possible to suppress the generation of turbulent flow such as the vortex flow B shown in FIG.

In each of the cases (a) to (d) and (e) the conventional apparatus of FIG. 4 in which the lip 11 is not formed at all, the cabin of the cab-over vehicle at a high speed of 100 km / h. Figure 2 shows an example of measured values of wind noise levels.
(The hatched area is the weather strip 10)
Shows the range in which the lip 11 is formed).

That is, as can be seen from FIG. 2, (a)
In the case of (e), the wind noise level in the passenger compartment is significantly reduced, in the case of (b) the wind noise level of the passenger compartment is further reduced, and in the case of (c), the wind noise level of the passenger compartment is reduced. Is further reduced, and in the case of (d), the wind noise level in the passenger compartment is reduced to the same extent as in the case of (c), and in both cases, the wind noise that is offensive to the occupant is effectively reduced. There is.

When the antenna is attached to the front pillar 5 of the cab-over vehicle, the traveling wind is separated from the outer surface of the vehicle body by the lip 11 of the weather strip 10 as shown by an arrow C, so that the rear portion of the antenna is removed. Since it is possible to suppress the generation of Karman vortex streets on the flow side, the above device can prevent the generation of abnormal noise from this point as well.

Moreover, the weather strip 10 has a lip 1
Since 1 is integrally molded and the structure is very simple and the number of parts does not increase, the cost increase can be easily suppressed even if the above device is adopted, while the above device is applied to existing vehicles. There is a great advantage that can be easily applied.

Although the above-mentioned embodiment relates to a cab-over vehicle, the type of vehicle is not limited to this, and similar effects can be obtained in other types of vehicles with an equivalent configuration. It goes without saying that you can do it.

[0016]

In the sound reducing device according to the present invention, the weather strip has the second lip projecting outward from the vehicle body on the front side of the vehicle from the first lip whose end portion abuts on the outer surface of the window frame opening edge portion. When the traveling wind hits the front surface of the vehicle while the vehicle is traveling and flows toward the rear of the vehicle along the outer surface of the vehicle, the second lip guides the vehicle to the outside of the vehicle and separates from the outer surface of the vehicle toward the rear of the vehicle. It has an excellent feature that can effectively reduce the generation of wind noise.

[Brief description of drawings]

FIG. 1 is an enlarged view of a vertical cross section of a main part in an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the above embodiment.

FIG. 3 is a partial perspective view of a cab-over vehicle.

FIG. 4 is an enlarged vertical cross-sectional view of a main part of a conventional device.

[Explanation of symbols]

1 cab 3 roof 5 front pillars 6 Window frame opening edge 7 windshield 9 lips 10 Weather Strip 11 lips

Claims (3)

[Claims] 1. A first lip whose end portion abuts on an outer surface of the window frame opening edge portion of a weatherstrip attached to a front window frame opening edge portion of a vehicle and holding a windshield, and the first lip. The second projecting outward from the vehicle body on the front side of the vehicle
And a second lip extending from an upper portion of the window frame opening edge portion to a side portion. 2. The noise reduction device according to claim 1, wherein the second lip extends along at least about a quarter of an upper portion of the front pillar along a front pillar that constitutes the window frame opening edge portion. 3. The noise reduction device according to claim 1, wherein the second lip extends along the front pillar forming the window frame opening edge portion to at least about half of the upper portion of the front pillar.