JP6684560B2 - Vehicle wind noise reduction structure - Google Patents

Description

  The present invention relates to a vehicle wind noise reduction structure for suppressing wind noise generated near a front pillar.

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

  The cowl is arranged between the windshield and the front hood, and in recent years, a gutter-shaped cowl panel has become the mainstream instead of the box-shaped cowl box. Usually, the cowl panel is manufactured by resin injection molding, and a gutter having a U-shaped cross section or a V-shaped cross section is formed immediately below the windshield, and both ends thereof are located inside the front fender in the width direction. . The gutter is curved so as to follow the curvature of the lower end of the windshield in a plan view, and to the rear from the center to the left and right (see, for example, Patent Document 2).

JP-A-8-127365 JP-A-2000-280934

  When a car is running, engine noise, tire noise, various wind noises, and the like become noise to the occupants, which is a factor that impairs occupant comfort. In particular, wind noise near the front pillar (hereinafter, simply referred to as wind noise) is generated near the head of the occupant in the driver's seat or the passenger's seat, which causes a reduction in comfort of the vehicle. Wind noise is generated by air that flows along the front surface of the windshield and flows rearward from the front pillar. In other words, the air that flows along the front surface of the windshield becomes a vertical vortex that wraps around the center of the vehicle immediately after being separated at the trailing edge of the front pillar, and collides with the air that flows along the side of the front pillar to generate wind noise. Let

  The loudness of the wind noise has a positive correlation with the amount of air flowing backward from the front pillar. In the vehicle equipped with the cowl panel described above, the wind noise increases because the flow rate of the air increases under the front pillar. That is, 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 rearward in the width direction. The air that has flowed at both ends of the gutter space in the width direction collides with the inner surface in the width direction of the front fender, turns upward, rides over the front fender, and flows in the width direction along the front surface of the windshield to flow in the front pillar. It merges with the air flow flowing into the lower part. As a result, the flow rate of the air separated at the trailing edge of the lower portion of the front pillar increases, and the vertical vortices increase and the wind noise increases.

  The object of the present invention is to suppress wind noise by suppressing the merging of the air flow flowing through the gutter space of the cowl panel with respect to the air flow in the vicinity of the front pillar and reducing the wind noise. It is to provide a reduction structure.

In order to achieve the above object, the present invention provides a windshield provided above a main body, and a front pillar that is provided so as to rise upward from the main body toward the rear and supports side edges of the windshield. A vehicle provided with a cowl provided below the windshield and forming a gutter space, wherein air flowing at both ends in the width direction of the gutter space is provided on a side surface of the main body behind the front pillar. An airflow guide portion that guides to an outer surface of a member that constitutes an upper portion is provided , and an airflow discharge path that is continuous with the gutter space and that has an opening on a side surface of the main body is provided at a side end of the cowl, The airflow guide portion is provided on a side surface side of the main body in the airflow discharge passage, and rotates the air flowing through the airflow discharge passage in a vertical vortex. A rotation direction of flow opposite to the direction.

  As a result, the air that has circulated in the gutter space of the cowl in the width direction is guided to the outer surface of the member that constitutes the upper side of the main body at the rear of the front pillar by the airflow guide portion. 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 causing the air circulating in the gutter space of the cowl in the width direction to collide with the vertical vortex generated behind the front pillar. Can be reduced.

1 is an overall perspective view of an automobile showing one embodiment of the present invention. FIG. 2 is an enlarged plan view of part A in FIG. 1. It is an expanded side view of the A section in FIG. It is a BB enlarged sectional view in FIG. FIG. 3 is an enlarged sectional view taken along line C-C in FIG. 2. It is a principal part top view which shows the effect | action of embodiment. It is a principal part side view which shows the effect | action of embodiment. It is a principal part side view which shows other embodiment of this invention.

  1 to 7 show an embodiment of the present invention.

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

  The front pillar 11 and the roof 14 support an outer edge of a windshield 15 that defines an upper front surface of a vehicle compartment. The entire windshield 15 has a curved surface shape which is inclined rearward, and the front pillar 11 is inclined rearward corresponding to the inclination of the side edge of the windshield 15. Side glasses 16 and 17 are respectively held on the front door 4 and the rear door 5 so as to be able to move up and down, and a door mirror 18 is attached to an upper portion of the front door 4. The door mirror 18 is fastened to a triangular panel (door mirror gadget) 19 provided on the front upper portion of the front door 4.

  A cowl panel 20, which is a resin injection molded product, is attached to the front 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 section in order to drain rainwater flowing from the front hood 3 and the windshield 15 during traveling in the rain. The gutter groove 21 is curved so as to go rearward from the center to the left and right so as to follow the curve of the lower end of the windshield 15, and is approximately halfway between the extension line L to the rear of the front hood 3. A gutter space 22 having a circular cross section is defined.

  As shown in FIG. 2, the cowl panel 20 has a plurality of outside air introduction holes 23 for introducing outside air into the vehicle compartment, and a rubber seal 24 attached to the lower surface of the front hood 3 is attached to the front end of the cowl panel 20. There is. As shown in FIG. 5, a rising portion 25 that rises from the cowl panel 20 toward the main body 10 located outside the gutter space 22 in the width direction is provided at a side end of the cowl panel 20. 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, on the upper surface of the front fender 2, an air flow guide portion 31 of a resin injection-molded product is provided at a portion located outside the end portion of the trough space 22 in the width direction. There is. The airflow guide portion 31 is a member having a semi-cylindrical cross section, and extends in the front-rear direction on the outer side in the width direction of the end portion of the gutter space 22 in a posture in which the inner surface of the semi-cylindrical surface faces the inner side in the width direction. The airflow guide portion 31 is formed such that the inner diameter of the semi-cylindrical portion increases from the front end portion toward the rear end portion.

  When the vehicle 1 configured as described above travels forward, most of the air flowing over the upper portion of the front hood 3 flows backward from the windshield 15 via the roof 14 and the front pillar 11, A part 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 rear edge of the front pillar 11 immediately after being separated at the rear edge of the front pillar 11 as indicated by an arrow 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 laterally of the front pillar 11 to generate wind noise.

  On the other hand, as shown in FIG. 6, the air that has flowed into the trough space 22 flows through the trough space 22 along the troughs 21 that are curved so that both ends thereof face rearward, and then flows toward the ends in the width direction. As shown in FIG. 5, it flows along the rising portion 25 to the upper surface of the front fender 2. As shown in FIG. 5, the air that has flowed to the upper surface of the front fender 2 flows upward from the lower portion along the inner surface of the semi-cylindrical portion of the airflow guide portion 31, and the rotation of the vertical vortex generated behind the front pillar 11 is generated. The flow is in the rotation direction 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 a rotation direction opposite to the rotation direction of the vertical vortex and collides with the vertical vortex generated on the rear side of the front pillar 11, so that 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 of the gutter space 22 in the width direction is provided with the outer surface of the member constituting the upper side of the main body 10 on the rear side of the front pillar 11. The air flow guide portion 31 is provided for guiding.

  This makes it possible to reduce the kinetic energy of the vertical vortex by causing the air that has circulated in the gutter space 22 of the cowl panel 20 in the width direction to collide with the vertical vortex generated behind the front pillar 11. It is possible to reduce the sound.

  Further, the airflow guide portion 31 causes the vertical air vortex generated by the air flow separated at the trailing edge of the front pillar 11 to collide the air flow from a direction different from the rotation direction of the vertical vortex.

  Thereby, the kinetic energy of the vertical vortex can be reliably reduced by the air guided by the airflow guide portion 31, and the effect of reducing the wind noise can be enhanced.

  Further, the air flow guide portions 31 are 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 flow to both ends in the width direction of the gutter space 22 and then the main body 10. The air flowing outward in the width direction along the upper surface has a flow in the rotation direction opposite to the rotation direction of the vertical vortex.

  Thereby, the kinetic energy of the vertical vortex can be reduced more reliably by causing the air flowing in the rotation direction opposite to the rotation direction of the vertical vortex to collide with the vertical vortex generated behind the front pillar 11. Therefore, the effect of reducing wind noise can be further enhanced.

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

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

  At the side end of the cowl panel 20, an air flow exhaust duct 41, which is a resin injection molded product and serves as a cylindrical air flow exhaust path, is installed to connect the trough space 22 and the air flow exhaust hole 32 of the front fender 2. ing.

  The airflow guide portion 42 of the present embodiment is provided on the side surface side of the front fender 2 of the airflow exhaust duct 41.

  In the automobile 1 configured as described above, when the vehicle travels forward, the air flowing into the trough space 22 is moved along the trough space 21 in the width direction along the trough groove 21 which is curved so that both ends thereof face rearward. After being introduced into the air flow exhaust duct 41, the air passes through the air flow exhaust duct 41 and is exhausted from the air flow exhaust 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 portion of the air flow guide portion 42 arranged on the outer end 41b side of the air flow discharge duct 41. As shown in FIG. 8, the flow is in a rotation direction opposite to the rotation direction 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 a rotation direction opposite to the rotation direction of the vertical vortex and collides with the vertical vortex generated on the rear side of the front pillar 11, so that Kinetic energy is reduced and wind noise is effectively reduced.

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

  An airflow exhaust duct 41, which is continuous with the gutter space 22 and has an airflow exhaust hole 32, is provided at a side end of the cowl panel 20 and has a side surface of the main body 10. The air that is provided on the side surface side of the main body 10 in the flow exhaust duct 41 and that flows through the air flow exhaust duct 41 has a flow in the rotation direction opposite to the rotation direction of the vertical vortex.

  Thereby, the kinetic energy of the vertical vortex can be reduced more reliably by causing the air flowing in the rotation direction opposite to the rotation direction of the vertical vortex to collide with the vertical vortex generated behind the front pillar 11. Therefore, the effect of reducing wind noise can be further enhanced.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the above-described embodiment is one in which the present invention is applied to a sedan type passenger vehicle, but it is naturally applicable to a one-box type vehicle, a minivan type (so-called 1.5 box type) vehicle, a convertible type vehicle 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 guide portion capable of forming an air flow in the rotation direction opposite to the rotation direction of the vertical vortex may be used, for example, You may employ | adopt the airflow guide part which combined the planar plate in plurality.

  Further, in the above-described embodiment, the air flow is directed obliquely upward from the air flow guide portion toward the lower portion of the front pillar, but the air flow may be led out directly from the lower end of the front pillar. Also in this case, the wind noise can be reduced by disturbing the vertical vortices. Further, the cowl panel may be a press-formed 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 section , 41 ... Air flow exhaust duct, 42 ... Air flow guide part.

Claims (2)

A windshield provided above the main body, a front pillar that is provided so as to rise upward from the main body toward the rear and supports side edges of the windshield, and a gutter space provided below the windshield. A vehicle including a constituent cowl,
Air flowing through both ends of the gutter space in the width direction is provided with an air flow guide portion that guides to an outer surface of a member that constitutes an upper side of the side surface of the main body behind the front pillar.
An airflow discharge path, which is continuous with the trough space and has an opening on a side surface of the main body, is provided at a side end of the cowl,
The airflow guide portion is provided on a side surface side of the main body in the airflow discharge passage, and causes the air flowing through the airflow discharge passage to flow in a rotation direction opposite to a rotation direction of a vertical vortex. The wind noise reduction structure of the vehicle. The airflow guide portion causes the airflow to collide with a vertical vortex of the air generated by separation of the airflow at the trailing edge of the front pillar from a direction different from the rotation direction of the vertical vortex. The wind noise reduction structure for a vehicle according to claim 1.

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