JPH05229459A - Noise preventive structure of automobile - Google Patents

Abstract

PURPOSE:To reduce a Helmholtz resonance generated by making the car room as a resonance box, that is, a buffeting noise, extensively without changing the form of the car room. CONSTITUTION:A car room is a space surrounded by a roof 12, side windows 14, doors 16, and a floor panel 18, and a front seat 20 is provided inside the car room 10. While a seat back 22 and a head rest 24 are provided to the front seat 20, a projection 26 is formed at the position near the upper end of the seat back 22 and facing the opening of the car room side when the side window 14 is fully opened. The air flow passing from the surface of a front glass 30, around a front pillar 40, through the upper side of a door mirror 100, and flowing on the outer side surface of the car room 10, is prevented from the invasion into the car room, by the projection 26 formed at the seat back 22 of the front seat 20, and a buffeting noise is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise prevention structure for a vehicle, which can effectively prevent noise caused by an air flow flowing on the surface of a vehicle when the vehicle is running with a side window or a sunroof open.

[0002]

2. Description of the Related Art In recent years, under the importance of comprehensive control of so-called N, V, H (noise, vibration, harshness), engine noise is significantly reduced, vehicle body rigidity is improved, and vehicle body weight is reduced. Technical breakthroughs have been achieved in various fields such as compatibility. As for vehicle interior noise, noise that penetrates directly into the vehicle interior, such as engine noise, is taken by using various sound insulation materials and sound absorbing materials. It is also evaluated by acoustic analysis using the element method.

[0003]

However, even when the vehicle interior is noisy, when only one side window is opened and the vehicle runs, or in a vehicle with a sunroof, the side window is closed and the sunroof is fully opened. The so-called buffeting noise that occurs when driving with
It is difficult to reduce this. That is, the buffeting noise is a frequency 1 that occurs in the passenger compartment as a resonance box.
The Helmholtz resonance is about 5 to 20 Hz, and it is most effective to change the form of the passenger compartment as the resonance box in order to reduce or prevent it, but such a change is practically impossible.

In view of the above conventional problems, it is an object of the present invention to provide a noise prevention structure for an automobile capable of significantly reducing buffeting noise with a relatively simple change of parts.

[0005]

In order to achieve such an object, the present invention forms a projecting portion on a seat back of a front seat provided in a vehicle compartment so as to face a side opening of the vehicle compartment. It is characterized by

Further, the present invention is characterized in that a projecting portion projecting from the center pillar provided between the front side window and the rear side window toward the passenger compartment is provided.

Here, it is preferable that the projecting portion is selectively arranged so as to protrude toward the vehicle interior side of the center pillar in either a direction substantially orthogonal to the vehicle longitudinal direction or a direction substantially parallel to the vehicle longitudinal direction. ..

Alternatively, the present invention is characterized in that a projecting portion is formed so as to hang down from the ceiling at an opening end on the vehicle rear side of the opening provided in the ceiling of the vehicle compartment.

Further, the headrest of the front seat provided in the vehicle compartment is extended and formed so as to face the opening provided in the ceiling of the vehicle compartment.

Furthermore, the casing of the door mirror provided at the vehicle front side end portion of the front door is formed so as to disturb the air flow along the vehicle body surface around the casing.

[0011]

With the above structure, in the automobile noise prevention structure according to the present invention, even when the vehicle is traveling with the side windows fully opened, the traveling wind that tries to enter the vehicle compartment is transmitted to the seat back of the front seat. Since it is not possible to enter the vehicle interior by being blocked by the overhanging part formed facing the room opening, the vehicle interior does not function as a Helmholtz resonance box, and the level of buffeting noise is greatly reduced. be able to.

Further, the overhanging portion arranged so as to project from the center pillar provided between the front side window and the rear side window to the inside of the vehicle compartment also prevents the running wind from entering the vehicle interior. Similar to the above, the level of buffeting noise can be significantly reduced.

At this time, the projecting portion is arranged so as to selectively protrude toward the vehicle interior side of the center pillar in either a direction substantially orthogonal to the vehicle longitudinal direction or a direction substantially parallel to the vehicle longitudinal direction. Therefore, the protruding state of the projecting portion can be controlled according to various parameters such as the opening of the side window, the occupant's entry / exit and running, and interference with the occupant.

Further, in a vehicle equipped with a sunroof, since an overhanging portion is formed so as to hang from the ceiling at the opening end on the vehicle rear side of the opening provided in the ceiling of the passenger compartment, the front window extends along the roof. Since the projecting portion prevents the flowing airflow from entering the passenger compartment, the level of buffeting noise can be significantly reduced in the same manner as for the side window.

Furthermore, since the headrest of the front seat provided in the vehicle compartment is extended and formed so as to face the opening provided in the ceiling of the vehicle compartment, the extended headrest prevents the inflow of air flow. By suppressing it, the level of buffeting noise can be significantly reduced in the same manner as described above.

Further, since the casing of the door mirror provided at the vehicle front side end portion of the front door is formed so as to disturb the air flow along the vehicle body surface around the casing, the air flow flowing outside the vehicle compartment is formed. It is possible to prevent the occurrence of buffeting noise by disturbing the two-dimensional flow of three-dimensionally.

[0017]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 (a) and 1 (b) are explanatory views showing a first embodiment of a vehicle noise prevention structure according to the present invention.

FIG. 1 (a) is a schematic view of the left front seat as seen from the rear side of the vehicle body toward the front portion of the vehicle body. As shown in FIG. 1 (a), the vehicle interior 10 includes a roof 12, a side window 1
4, the door 16 and the floor panel 18, which is a space surrounded by a front seat 20.

The front seat 20 is provided with a seat back 22 and a headrest 24, and is projected near the upper end of the seat back 22 to a position facing the vehicle cabin side opening when the side window 14 is fully opened. The part 26 is formed.

FIG. 1 (b) is a plan view of FIG. 1 (a). The thick arrows in the figure indicate the airflow that flows outside the vehicle. That is, the airflow that flows around the front pillar 40 from the surface of the windshield 30, passes through the upper portion of the door mirror 100, and flows on the outer side surface of the vehicle interior 10,
The projecting portion 26 formed on the seat back 22 of the front seat 20 prevents the vehicle from entering the vehicle interior, and suppresses Helmholtz resonance in which the vehicle interior is a resonance box, that is, buffeting noise.

Next, a second embodiment of the present invention will be described. FIG. 2A is a schematic view of the left front seat as seen from the front side of the vehicle body toward the rear portion of the vehicle body, and FIG. 2B is a perspective view of the vehicle to which the second embodiment of the present invention is applied as seen from the left front side. The structure is almost the same as that of the first embodiment. However,
Instead of forming the overhanging portion facing the vehicle compartment side opening of the seat back 22, the shield panel 2 as the overhanging portion is formed on the center pillar 50 behind the side window 14.
6a is provided.

Due to the provision of the shield panel 26a, the air flow flowing on the outer surface of the vehicle compartment is prevented from flowing into the vehicle compartment by the same operation as described in the first embodiment. , Buffeting noise is suppressed.

The overhanging portion 26 of the seat back 22 of the first embodiment and the shield panel 26a of the second embodiment.
The optimum shape, size, material, etc. of the vehicle may be obtained through simulations on the type of vehicle to be applied and running tests in an actual vehicle.

FIG. 3 shows the shield panel 2 of the second embodiment.
Fig. 6 is a schematic view of a vehicle interior when 6a is applied to a two-door vehicle.
The shield panel 26a is provided inside the center pillar 50 that separates the side window 14 from the quarter window 60 located on the side of the rear seat 70.

As is clear from FIG. 3, if the shield panel 26a is always upright and protrudes in the vehicle width direction (the direction orthogonal to the vehicle front-rear direction), it becomes an obstacle when the occupant of the rear seat 70 gets on and off. It is extremely inconvenient. Therefore, in the present embodiment, as shown in FIG. 4, the shield panel 26a is configured so as to be selectively upright or parallel to the vehicle interior side surface of the center pillar 50. There is.

That is, the shield panel 26a is rotatably supported around the rotation axis P, and has a branch portion 26a1 extending substantially orthogonally from the vicinity of the rotation axis P. The quarter panel 82 on the vehicle interior side, which is connected to the rear fender 80, has a shield panel 26a.
An actuator 84 for rotation is fixed, and a drum 84a is attached to the output shaft of the actuator 84. In the branch portion 26a1 of the shield panel 26a,
A drive wire 86 wound around a drum 84a provided on the actuator 84, one end of which is fixed and fixed to the drive wire 86 via a branch portion 26a1, and the other end is fixed via a locking metal fitting 82a. A spring 88 fixed to the panel 82 is provided. Further, the trim 50a of the center pillar 50 mounted in the vehicle compartment has a recess 50 at a portion where the shield panel 26a is stored.
a1 is provided to prevent extra protrusions from forming in the vehicle compartment.

FIG. 5 shows an operation block diagram of the shield panel 26a. The actuator 84, which is the drive source of the shield panel 26a, is connected to the vehicle-mounted power source through the door switch S1 that detects opening and closing of the door and the side window fully open detection switch S2 that detects whether or not the side window is fully open. ing. As the operation of the shield panel 26a, when the drum 84a rotates in the clockwise direction, the shield panel 26a rotates around the rotation axis P against the tension of the spring 88, and the shield panel 26a moves to the trim 50a in the vehicle compartment. Stand upright. On the other hand, the drum 84a
When is rotated counterclockwise, the shield panel 26a is rotated about the rotation axis P by the tension of the spring 88,
The shield panel 26a is stored in the trim 50a in the vehicle compartment.

Looking at the relationship between the operation of the shield panel 26a and the open / closed states of the door and the side window, under the condition that all the doors are closed and one of the side windows is fully opened. The door switch S1, the side window fully open detection switch S2 and the actuator 8 are arranged so that the shield panel 26a stands upright.
It suffices to match with the forward and reverse rotation directions of 4. With this configuration, the occupant in the rear seat does not get in the way when getting on and off the vehicle, and the shield panel 26a is stored in the trim 50a except when the side windows are fully opened. , It looks good and is safe without any interference with passengers. Even if the shield panel 26a is in an upright state and interferes with the occupant, the spring 88 is extended and the shield panel 26a easily rotates, so that the safety of the occupant is ensured.

Next, a third embodiment of the present invention will be described. FIG. 6 is a schematic perspective view of a vehicle equipped with a sunroof having an opening in the roof. A sunroof is provided on the roof 12 of the four-door vehicle shown in the drawing, and when the sunroof is fully opened,
The opening 90 appears. A plate-shaped shield panel 26b is provided at the opening end of the opening 90 on the vehicle rear side. Therefore, the airflow flowing from the surface of the windshield 30 along the roof 12 while the vehicle is running in the fully open state of the sunroof is not blocked by the shield panel 26b and intrudes into the passenger compartment, which significantly reduces the buffeting noise level. Can be reduced to

In the present embodiment, the plate-like member is used as the projecting portion that is formed so as to hang down at the vehicle rear side opening end of the sunroof, but a hump-like overhang having a required projected area is hung down. It may be formed, and an in-vehicle device such as an air purifier may be installed therein.

Further, as shown in FIG. 6B, the sheet 2
By providing the extension portion 24a reaching the vicinity of the roof 12 in the headrest 24 of 0, the same operation as that of forming and projecting the overhang portion at the opening end portion of the sunroof can be performed. If this embodiment is combined with the first embodiment of the present invention, the level of buffeting noise due to the side window opening and the sunroof opening can be reduced.

Next, a fourth embodiment of the present invention will be described. The buffeting noise countermeasures of the first to third embodiments described so far are all carried out by arranging various members for deflecting the air flow in the passenger compartment of the automobile. Considering the space utility of the space, it may be desirable to be able to take measures by using a member arranged outside the vehicle compartment. In view of this point, in this embodiment, the countermeasure is taken by changing the shape of the casing of the door mirror. The measures will be described in detail below.

(A) FIG. 7A shows a schematic plan view of the door mirror 100, and FIG. 7B shows a side view thereof. As shown in these drawings, the overall length of the casing 102 (the outer shape is shown by a two-dot chain line in the figure) used in the conventional door mirror 100 in the vehicle front-rear direction is shortened by 46 mm (the changed outer shape is shown by a solid line). ).

(B) FIG. 8A shows a perspective view of the door mirror 100 as seen from above the rear side of the vehicle, and FIG. As shown in these figures, the door mirror 1
The mirror base 104 of No. 00 was formed as a protrusion (height 6 mm in this embodiment) having a negative surface (concave surface having a depth of 2 mm in this embodiment). In this case, if the line connecting the apex of the protrusion and both ends of the bottom side is a straight line, that is, if it is formed as a protrusion having a flat surface instead of a negative surface, the effect is significantly reduced.

(C) FIGS. 9 (a) and 9 (b) are perspective views of the door mirror 100 after the countermeasure as seen from the vehicle front side. In FIG. 9A, the padding portions 102 a, 1 are provided on the upper end portion of the casing 102 of the door mirror 100 and the upper portion of the stay 106.
06a is provided. Further, in FIG. 9B, a buildup portion 104 a is provided on the upper side of the door mirror base 104.

According to the measures for the door mirror 100 described above, the two-dimensional air flow that flows from the windshield 30 around the front pillar 40 and flows to the outside of the passenger compartment causes (A) the mirror casing 102 to suddenly rise. (B) Protrusion having a negative surface provided on the mirror base 104 (C) Mirror casing 102, mirror base 104,
Alternatively, the padding portion 102a provided on the stay 106,
Since the three-dimensionally disturbed by 104a and 106a, Helmholtz resonance that occurs in the vehicle interior as a resonance box is prevented, and the level of buffeting noise can be significantly reduced.

Incidentally, in the countermeasure by changing the shape of the door mirror 100, the effect is subtly changed according to the applied vehicle type including the vehicle interior volume and the vehicle interior opening area.
It is recommended to select the most effective countermeasure after confirming the effect through actual vehicle simulation.

[0038]

As described above in detail, according to the noise prevention structure for a vehicle according to the present invention, even when the vehicle is traveling with the side windows fully opened, the traveling wind that tries to enter the vehicle compartment is not absorbed by the front seat. Since the seat back is blocked by the overhanging part formed facing the opening of the passenger compartment and cannot enter the passenger compartment, the passenger compartment does not function as a Helmholtz resonance box and the level of buffeting noise is reduced. It can be significantly reduced. Further, the projecting portion arranged so as to project from the center pillar provided between the front side window and the rear side window to the vehicle interior side also has the same effect as described above.

At this time, the projecting portion is arranged so as to selectively project toward the vehicle interior side of the center pillar in either a direction substantially orthogonal to the vehicle longitudinal direction or a direction substantially parallel to the vehicle longitudinal direction. Since the projecting state is controlled according to various parameters such as the opening of the side window and the open / closed state of the door, it does not hinder the occupant's entry / exit, and the occupant's safety is impaired by the interference with the occupant. Not even.

Further, in a vehicle equipped with a sunroof, since an overhanging portion is formed so as to hang down from the ceiling at the opening end on the vehicle rear side of the opening provided in the ceiling of the vehicle compartment, the front window extends along the roof. Since the projecting portion prevents the flowing airflow from entering the passenger compartment, the level of buffeting noise can be significantly reduced in the same manner as for the side window.

Furthermore, since the headrest of the front seat provided in the vehicle compartment is extended and formed so as to face the opening provided in the ceiling of the vehicle compartment, the extended headrest prevents the inflow of air flow. By suppressing it, the level of buffeting noise can be significantly reduced in the same manner as described above.

Further, since the casing of the door mirror provided at the vehicle front side end portion of the front door is formed so as to disturb the air flow along the surface of the vehicle body around the casing, the air flow flowing outside the vehicle compartment is formed. The three-dimensional disturbance of the two-dimensional flow can prevent the generation of buffeting noise, and various other excellent effects can be obtained.

[Brief description of drawings]

FIG. 1 (a) is a schematic plan view of an automobile to which an embodiment of an automobile noise prevention structure according to the present invention is applied, and FIG. 1 (b) is a side sectional view thereof.

FIG. 2 (a) is a schematic side sectional view of a vehicle to which another embodiment of the vehicle noise prevention structure according to the present invention is applied, and FIG. 2 (b) is a perspective view thereof.

FIG. 3 is a perspective view showing the interior of the vehicle.

FIG. 4 is a side sectional view showing a mechanism of another embodiment of the vehicle noise prevention structure according to the present invention.

FIG. 5 is a schematic operation block diagram of another embodiment of the vehicle noise prevention structure according to the present invention.

FIG. 6 is a schematic perspective view of an automobile to which still another embodiment of the automobile noise prevention structure according to the present invention is applied.

FIG. 7 (a) is a plan view showing an embodiment of a door mirror to which a vehicle noise prevention structure according to the present invention is applied, and FIG. 7 (b) is a side view thereof.

FIG. 8A is a perspective view showing another embodiment of the door mirror to which the automobile noise prevention structure according to the present invention is applied, and FIG.
FIG. 3 is a sectional view of the relevant part.

9 (a) and 9 (b) are perspective views showing still another embodiment of the door mirror to which the vehicle noise prevention structure according to the present invention is applied.

[Explanation of symbols]

 10 Vehicle Interior 12 Roof 14 Side Window 16 Door 18 Floor Panel 20 Front Seat 22 Seat Back 24 Headrest 24a Headrest Extension 26 Overhang (Seatback 22) 26a, 26b Shield Panel 26a1 Branch (Shield Panel 26a) 30 Front Glass 40 Front Pillar 50 Center Pillar 50a Trim 50a1 Recess (Trim 50a) 60 Quarter Window 70 Rear Seat 80 Rear Fender 82 Quarter Panel 82a Locking Metal Fitting 84 Actuator 84a Drum 86 Drive Wire 88 Spring 90 Sunroof Opening 100 Door Mirror 102 Casing 104 Mirror base 106 Stay 102a Overlaid portion (of casing 102) 104a Overlaid portion (Mira Base 104 of) 106a overlaying portion (of the stay 106) P rotation axis (shield panels 26a) S1 door switch S2 side window fully open detection switch

Claims (6)

[Claims] 1. A noise prevention structure for an automobile, characterized in that a projecting portion is formed in a seat back of a front seat provided in a vehicle compartment so as to face a side opening of the vehicle compartment. 2. A noise prevention structure for a vehicle, comprising a projecting portion projecting from a center pillar provided between a front side window and a rear side window toward a vehicle interior side. 3. The projecting portion is selectively disposed so as to project toward the vehicle interior side of the center pillar in either a direction substantially orthogonal to a vehicle front-rear direction or a direction substantially parallel to the vehicle front-rear direction. The vehicle noise prevention structure according to claim 2. 4. A noise prevention structure for an automobile, characterized in that an overhanging portion is formed so as to hang from the ceiling at an opening end on the vehicle rear side of the opening provided in the ceiling of the vehicle compartment. 5. A noise prevention structure for an automobile, characterized in that a headrest of a front seat provided in a vehicle compartment is extended and formed so as to face an opening provided in a ceiling of the vehicle compartment. 6. A noise prevention structure for an automobile, characterized in that a casing of a door mirror provided at a vehicle front side end portion of a front door is formed so as to disturb an air flow along a vehicle body surface around the casing. ..