JP6784807B2 - Vehicle wind noise reduction structure - Google Patents

Description

The present invention relates to a vehicle wind noise reduction structure for suppressing wind noise generated in the vicinity of the front pillars.

Vehicles such as automobiles have a windshield provided on the upper part of the front side of the passenger compartment and front pillars provided on both sides of the windshield in the width direction. The front pillar is tilted backward together with the windshield from the lower end side to the upper end side, and the side window is located on the rear side. A cowl extending in the width direction of the body is installed at the lower end of the windshield, and rainwater that has flowed down from the windshield is discharged to the outside of the vehicle and introduced into the passenger compartment of the outside air through this cowl (for example,). See Patent Document 1).

The cowl is placed between the windshield and the front hood, and in recent years, a gutter-shaped cowl panel has become the mainstream instead of a box-shaped cowl box. Normally, the cowl panel is manufactured by resin injection molding, and a U-shaped or V-shaped cross-sectional gutter is formed directly under the windshield, and both ends thereof are located inside the front fender in the width direction. .. The gutter is curved so as to move backward from the center toward the left and right so as to follow the curve of the lower end of the windshield in a plan view (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 8-127365 Japanese Unexamined Patent Publication No. 2000-280934

When the vehicle is running, engine noise, tire noise, various wind noises, and the like become noise for the occupants, which is a factor that impairs the comfort of the occupants. In particular, wind noise near the front pillars (hereinafter, simply referred to as wind noise) is generated near the heads of occupants in the driver's seat and passenger's seat, which causes the comfort of the automobile to be impaired. Wind noise is generated by the air that circulates along the front of the windshield and flows backward from the front pillars. In other words, the air flowing along the front of the windshield becomes a vertical vortex that wraps around to the center of the vehicle body immediately after peeling off at the trailing edge of the front pillar, and collides with the air flowing on the side of the front pillar to generate wind noise. Let me.

The loudness of the wind noise has a positive correlation with the amount of air flowing backward from the front pillars. In the automobile equipped with the cowl panel described above, the air flow rate is increased at the lower part of the front pillar, so that the wind noise is increased. That is, a part of the air flowing along the front surface of the front hood is blown into the gutter space of the cowl panel, and then flows in the gutter space curved toward the rear in the width direction. The air flowing to both ends in the width direction of the gutter space collides with the inner side surface in the width direction of the front fender, turns upward to get over the front fender, and circulates in the width direction along the front surface of the windshield to the front pillar. It merges with the flow of air flowing into the lower part. As a result, the flow rate of air separated at the trailing edge of the lower part of the front pillar increases, the above-mentioned vertical vortex becomes large, and the wind noise becomes loud.

An object of the present invention is the wind noise of a vehicle capable of suppressing the merging of the air flow flowing through the gutter space of the cowl panel with respect to the air flow near the front pillar and reducing the wind noise. The purpose is to provide a reduced structure.

In the present invention, in order to achieve the above object, a windshield provided above the main body and a front pillar provided so as to rise upward from the main body toward the rear and supporting a side edge of the windshield. A vehicle provided with a cowl provided below the windshield to form a gutter space, which is a substantially semi-cylindrical member, and has an inner surface facing inward in the width direction at an end of the gutter space. It is provided on the outer side in the width direction, and is provided with an air flow guide portion that guides the air flowing at both ends in the width direction to the outer surface of a member constituting the upper side of the side surface of the main body behind the front pillar.

As a result, the air flowing in the width direction of the gutter space of the cowl is guided by the air flow guide portion to the outer surface of the member constituting the upper side of the side surface of the main body behind the front pillar, so that the gutter space of the cowl can be guided. The air flowing in the width direction collides with the vertical vortex generated behind the front pillar.

According to the present invention, it is possible to reduce the kinetic energy of the vertical vortex by colliding the air flowing in the width direction of the gutter space of the cowl with the vertical vortex generated behind the front pillar, and the wind noise. Can be reduced.

It is an overall perspective view of the automobile which shows one Embodiment of this invention. It is an enlarged plan view of the part A in FIG. It is an enlarged side view of the part A in FIG. FIG. 2 is an enlarged cross-sectional view taken along the line BB in FIG. FIG. 2 is an enlarged cross-sectional view taken along the line CC in FIG. It is a main part plan view which shows the operation of an embodiment. It is a side view of the main part which shows the operation of an embodiment. It is a main part side view which shows the other embodiment of this invention.

1 to 7 show an embodiment of the present invention.

The automobile 1 as a vehicle provided with the wind noise reduction structure of the present invention is a sedan type passenger car, and as shown in FIG. 1, the front fender 2, the front hood 3, the front door 4, the rear door 5, the rear fender 6, and the like are included. It has a main body 10 as an outer shell. The front pillar 11, the center pillar 12, and the rear pillar 13 extend upward from the main body 10, and the roof 14 is supported at the upper ends of the pillars 11 to 13.

The front pillar 11 and the roof 14 support the outer edge of the windshield 15 that defines the upper front surface of the vehicle interior. The windshield 15 has a curved surface shape that is inclined backward as a whole, and the front pillar 11 is inclined backward corresponding to the inclination of the side end of the windshield 15. Side glasses 16 and 17 are held up and down on the front door 4 and the rear door 5, respectively, and a door mirror 18 is attached to the upper part of the front door 4. The door mirror 18 is fastened to a triangular panel (door mirror gadget) 19 provided at the upper end front portion of the front door 4.

A cowl panel 20 made of a resin injection molded product is mounted in front of the lower edge of the windshield 15 along the vehicle width direction. As shown in FIG. 4, the cowl panel 20 has a gutter groove 21 having an arc cross-sectional shape so as to discharge rainwater flowing from the front hood 3 and the windshield 15 when traveling in the rain. The gutter groove 21 is curved so as to move backward from the center toward the left and right along the curve of the lower end of the windshield 15, and is approximately half between the gutter groove 21 and the extension line L to the rear of the windshield 3. The gutter space 22 having a circular cross section is defined.

As shown in FIG. 2, the cowl panel 20 is formed with a plurality of outside air introduction holes 23 for introducing outside air into the vehicle interior, and a rubber seal 24 that is in close contact with the lower surface of the front hood 3 is attached to the front end. There is. As shown in FIG. 5, the side end of the cowl panel 20 is provided with a rising portion 25 that rises from the cowl panel 20 toward the main body 10 located outside in the width direction of the gutter space 22. The cowl panel 20 covers a wiper mechanism (wiper motor, wiper arm) and the like (not shown) attached to the bulkhead.

As shown in FIGS. 2, 3 and 5, an air flow guide portion 31 of a resin injection molded product is provided on the upper surface of the front fender 2 at a portion located outside in the width direction of the end portion of the gutter space 22. There is. The air flow guide portion 31 is a member having a semi-cylindrical cross section, and extends in the front-rear direction on the outside in the width direction of the end portion of the gutter space 22 in a posture in which the inner surface of the semi-cylinder faces inward in the width direction. Further, the air flow guide portion 31 is formed so that the inner diameter of the semi-cylinder increases from the front end portion to the rear end portion.

In the automobile 1 configured as described above, when traveling forward, most of the air flowing through the upper part of the front hood 3 flows backward from the windshield 15 via the roof 14 and the front pillar 11. A part of it flows into the gutter space 22 of the cowl panel 20.

The air flowing in the width direction along the front surface of the windshield 15 and flowing to the trailing edge of the front pillar 11 immediately after being separated at the trailing edge of the front pillar 11 as shown by arrows in FIGS. 6 and 7. It becomes a vertical vortex that wraps around the center of the vehicle body and collides with the air flowing on the side of the front pillar 11 to generate wind noise.

On the other hand, as shown in FIG. 6, the air flowing into the gutter space 22 circulates in the gutter space 22 toward the end in the width direction along the gutter groove 21 curved so that both ends face rearward. As shown in FIG. 5, it circulates along the rising portion 25 to the upper surface of the front fender 2. As shown in FIG. 5, the air flowing to the upper surface of the front fender 2 flows from the lower part to the upper side along the inner surface of the semi-cylinder of the air flow guide portion 31, and the rotation of the vertical vortex generated on the rear side of the front pillar 11. The flow flows in the direction of rotation opposite to the direction, and flows toward the triangular panel 19 and the side glass 16 on the rear side of the front pillar 11, as shown in FIGS. 6 and 7.

As a result, the air flowing into the cowl panel 20 becomes a flow of air in the rotation direction opposite to the rotation direction of the vertical vortex and collides with the vertical vortex generated behind the front pillar 11, so that the vertical vortex Kinetic energy is reduced and wind noise is effectively reduced.

As described above, according to the wind noise reduction structure of the present embodiment, the air circulated at both ends in the width direction of the gutter space 22 is passed through the outer surface of the member constituting the upper side of the side surface of the main body 10 on the rear side of the front pillar 11. The air flow guide unit 31 that guides the air flow guide unit 31 is provided.

As a result, the kinetic energy of the vertical vortex can be reduced by colliding the air flowing in the gutter space 22 of the cowl panel 20 in the width direction with the vertical vortex generated behind the front pillar 11, and the windbreak can be achieved. It is possible to reduce the sound.

Further, the air flow guide portion 31 collides the air flow with the vertical vortex of air generated by the separation of the air flow at the trailing edge of the front pillar 11 from a direction different from the rotation direction of the vertical vortex.

As a result, the kinetic energy of the vertical vortex can be reliably reduced by the air guided by the air flow guide unit 31, and the effect of reducing wind noise can be enhanced.

Further, the air flow guide portion 31 is provided so as to extend upward from the upper surface of the main body 10 located outside both ends in the width direction of the gutter space 22, and after circulating in both ends in the width direction of the gutter space 22, the main body 10 The air flowing outward in the width direction along the upper surface is defined as the flow in the rotation direction opposite to the rotation direction of the vertical vortex.

As a result, the kinetic energy of the vertical vortex can be reduced more reliably by colliding the air flowing in the direction opposite to the rotation direction of the vertical vortex with the vertical vortex generated behind the front pillar 11. Therefore, it is possible to further enhance the effect of reducing wind noise.

FIG. 8 shows another embodiment of the present invention. The same components as those in the above embodiment are designated by the same reference numerals.

As shown in FIG. 8, the front fender 2 is formed with an air flow discharge hole 32 as an oval opening that is long in the front-rear direction. The airflow discharge hole 32 is located at substantially the same position as the gutter space 22 in the lateral view, that is, immediately in front of the base of the front pillar 11 in the front-rear direction and below the rising start portion of the front pillar 11 with respect to the main body 10 in the vertical direction. doing.

At the side end of the cowl panel 20, an air flow discharge duct 41 as a tubular air flow discharge path made of a resin injection molded product is installed in order to communicate the gutter space 22 and the air flow discharge hole 32 of the front fender 2. ing.

The air flow guide portion 42 of the present embodiment is provided on the side surface side of the front fender 2 of the air flow discharge duct 41.

In the automobile 1 configured as described above, when traveling forward, the air flowing into the gutter space 22 ends in the gutter space 22 in the width direction along the gutter groove 21 curved so that both ends face rearward. After being introduced into the air flow discharge duct 41, it passes through the air flow discharge duct 41 and is discharged from the air flow discharge hole 32. A part of the air discharged from the air flow discharge hole 32 flows upward from the lower part along the inner surface of the semi-cylindrical of the air flow guide portion 42 arranged on the outer end 41b side of the air flow discharge duct 41. As shown in 8, the flow is in the direction of rotation opposite to the direction of rotation of the vertical vortex generated on the rear side of the front pillar 11, and flows toward the triangular panel 19 and the side glass 16 on the rear side of the front pillar 11.

As a result, the air flowing into the cowl panel 20 becomes a flow of air in the rotation direction opposite to the rotation direction of the vertical vortex and collides with the vertical vortex generated behind the front pillar 11, so that the vertical vortex Kinetic energy is reduced and wind noise is effectively reduced.

As described above, according to the wind noise reduction structure of the present embodiment, the air flowing in the width direction of the gutter space 22 of the cowl panel 20 is generated behind the front pillar 11 as in the above-described embodiment. By colliding with, it is possible to reduce the kinetic energy of the vertical vortex, and it is possible to reduce the wind noise.

Further, at the side end of the cowl panel 20, an air flow discharge duct 41 which is continuous with the gutter space 22 and has an air flow discharge hole 32 on the side surface of the main body 10 is provided, and the air flow guide portion 42 uses the air. The air flowing through the air flow discharge duct 41, which is provided on the side surface side of the main body 10 of the flow discharge duct 41, is made to flow in the rotation direction opposite to the rotation direction of the vertical vortex.

As a result, the kinetic energy of the vertical vortex can be reduced more reliably by colliding the air flowing in the direction opposite to the rotation direction of the vertical vortex with the vertical vortex generated behind the front pillar 11. Therefore, it is possible to further enhance the effect of reducing wind noise.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, although the above embodiment applies the present invention to a sedan type passenger car, it can naturally be applied to a one-box type automobile, a minivan type (so-called 1.5 box type) automobile, a convertible automobile, and the like. is there. Further, in the above-described embodiment, the air flow guide portion is made of a member having a semi-cylindrical cross section, but any air flow can be formed as long as it can form an air flow in a rotation direction opposite to the rotation direction of the vertical vortex. An air flow guide unit in which a plurality of flat plates are combined may be adopted.

Further, in the above embodiment, the air flow is obliquely upward from the air flow guide portion toward the lower part of the front pillar, but the air flow may be derived from the lower end of the front pillar directly upward. In some cases, the wind noise can be reduced by disturbing the vertical vortex. Further, the cowl panel may be a press-molded product such as a steel plate, or may have a gutter groove having a V-shaped cross section that defines a gutter space having an inverted triangular cross section.

1 ... Automobile, 2 ... Front fender, 3 ... Front hood, 10 ... Main body, 11 ... Front pillar, 15 ... Windshield, 20 ... Cowl panel, 21 ... Gutter groove, 22 ... Gutter space, 31 ... Air flow guide , 41 ... Air flow discharge duct, 42 ... Air flow guide section.

Claims (4)

A windshield provided above the main body, a front pillar provided so as to rise upward from the main body and supporting the side edge of the windshield, and a gutter space provided below the windshield. A vehicle equipped with a constituent cowl
It is a substantially semi-cylindrical member, and is provided on the outside in the width direction of the end of the gutter space with the inner surface facing inward in the width direction, and the air circulated at both ends in the width direction is discharged behind the front pillar. An air flow guide portion for guiding to the outer surface of a member constituting the upper side of the side surface of the main body is provided .
The air flow guide portion is characterized in that the air flow collides with the vertical vortex of air generated by the separation of the air flow at the trailing edge of the front pillar from a direction different from the rotation direction of the vertical vortex. Wind noise reduction structure for vehicles. The air flow guide unit
It is provided so as to extend upward from the upper surface of the main body located outside both ends in the width direction of the gutter space.
A claim characterized in that the air that flows to both ends in the width direction of the gutter space and then flows outward in the width direction along the upper surface of the main body is made to flow in the rotation direction opposite to the rotation direction of the vertical vortex. Item 1. The vehicle wind noise reduction structure according to item 1 . The air flow guide portion, a lower portion of the front pillar, a side end of the cowl, the rear end upper surface of the front fender, it is provided on at least one front door triangular panel side to claim 2, wherein The wind noise reduction structure of the vehicle described. At the side end of the cowl, an air flow discharge path which is continuous with the gutter space and has an opening on the side surface of the main body is provided.
The air flow guide portion is provided on the side surface side of the main body in the air flow discharge path, and is characterized in that the air flowing through the air flow discharge path is made to flow in a rotation direction opposite to the rotation direction of the vertical vortex. The vehicle wind noise reduction structure according to claim 1 .

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