JP2022139479A - Vehicle front part structure - Google Patents

Abstract

To provide a vehicle front part structure that can prevent muffled sound from being generated in a cabin by suppressing vibrations of a windshield glass while suppressing a weight increase.SOLUTION: A vehicle front part structure 100 according to the present invention includes: a dash panel 102 that sections a cabin 105 and a power unit installation room 106; and a cowl top panel 104 that is connected to an upper end of the dash panel in a vehicle width direction to support a windshield glass 108. The cowl top panel includes a vertical wall portion 122 that extends in an up-down direction immediately before reaching the dash panel. The vertical wall portion of the cowl top panel is bent such that a center 136 in the vehicle width direction protrudes most toward a vehicle rear side.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle front structure.

A vehicle, such as an automobile, includes a vehicle front structure having a cowl top panel. The cowl top panel forms a closed cross-sectional structure extending in the vehicle width direction together with, for example, a dash panel and appropriate reinforcing members, and this closed cross-sectional structure supports the windshield glass.

Patent Literature 1 describes a cowl structure 10 . The cowl structure 10 includes a cowl brace 13, and the cowl top outer 11, the cowl top inner 12, and the cowl brace 13 form a closed cross-sectional portion 21 as a closed cross-sectional structure in a vehicle side view. As a result, the cowl structure 10 has a stronger supporting rigidity for the front windshield glass 3 .

For this reason, Patent Document 1 states that the cowl structure 10 can suppress the vibration of the front windshield glass 3 in the vertical direction of the vehicle, compared to a cowl structure that does not have a closed cross section.

JP 2017-47866 A

Here, the cowl top panel is joined to, for example, the upper end of the dash panel over the vehicle width direction. The dash panel is a member that partitions the vehicle interior and the power unit installation room, and has a surface that extends in the vertical direction of the vehicle. Therefore, the dash panel may vibrate in the longitudinal direction of the vehicle when the vehicle is running.

When the dash panel vibrates in the longitudinal direction of the vehicle, the cowl top panel joined to the dash panel vibrates not only in the longitudinal direction of the vehicle but also in the vertical direction of the vehicle. Since the windshield glass is supported by the cowl top panel, vibrations of the cowl top panel in the vertical direction of the vehicle are transmitted. As a result, the windshield glass vibrates in the direction perpendicular to the plane, causing a booming noise in the room.

In the cowl structure 10 of Patent Document 1, a cowl brace 13 that connects the cowl top outer 11 and the cowl top inner 12 is provided in order to suppress the vibration of the front windshield glass 3 . Therefore, in the cowl structure 10, although the support rigidity of the front windshield glass 3 can be increased, the cowl brace 13 increases the number of parts, resulting in an increase in weight.

In view of such problems, the present invention provides a vehicle front structure that can suppress vibration of the windshield glass while suppressing an increase in weight, and can prevent the occurrence of muffled noise in the vehicle interior. It is an object.

In order to solve the above problems, a typical configuration of the present invention includes a dash panel that separates a vehicle compartment and a power unit installation room, and a dash panel that is joined to the upper end of the dash panel across the vehicle width direction to support the windshield glass. and a cowl top panel, the cowl top panel having a vertical wall portion extending vertically just before reaching the dash panel, and the vertical wall portion of the cowl top panel protruding most rearward of the vehicle at the center in the vehicle width direction. It is characterized by being curved so as to

ADVANTAGE OF THE INVENTION According to this invention, the vehicle front part structure which can suppress the vibration of a windshield glass, and can prevent that a muffled sound generate|occur|produces in a vehicle interior can be provided, suppressing a weight increase.

1 is a perspective view showing a vehicle front structure according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of the vehicle front structure of FIG. 1 taken along the line AA. FIG. 2 is a top view of the vehicle front structure of FIG. 1; It is a figure which shows the state which looked at the vehicle front part structure of FIG. 1 from the diagonally downward direction. FIG. 4 is a diagram showing a modification of the vehicle front structure of FIG. 3; FIG. 6 is a DD sectional view of the vehicle front structure of FIG. 5;

A representative configuration of one embodiment of the present invention includes a dash panel that separates a vehicle compartment and a power unit installation room, and a cowl top panel that is joined to the upper end of the dash panel in the vehicle width direction and supports the windshield glass. The cowl top panel has a vertical wall portion that extends vertically just before reaching the dash panel, and the vertical wall portion of the cowl top panel is curved so that the center in the vehicle width direction protrudes most rearward of the vehicle. It is characterized by

Since the dash panel has a surface extending in the vertical direction of the vehicle, it may vibrate in the longitudinal direction of the vehicle when the vehicle is running. Since the cowl top panel is joined to the upper end of the dash panel, it vibrates not only in the longitudinal direction of the vehicle but also in the vertical direction of the vehicle as the dash panel vibrates in the longitudinal direction of the vehicle. Also, the windshield glass is supported by the cowl top panel. Therefore, the vibration of the cowl top panel in the vertical direction of the vehicle is transmitted to the windshield glass. As a result, the windshield glass may vibrate in the direction perpendicular to the plane and generate a muffled sound in the vehicle interior.

Therefore, in the present invention, the vertical wall portion of the cowl top panel is curved so that the center in the vehicle width direction projects most toward the rear of the vehicle. Therefore, the cowl top panel is less likely to deform in the longitudinal direction of the vehicle due to the curved vertical wall portion, and vibrations in the longitudinal direction of the vehicle and in the vertical direction of the vehicle can be suppressed. In the above configuration, since the cowl top panel is joined to the upper end of the dash panel, by suppressing vibration of the cowl top panel, vibration of the dash panel in the longitudinal direction of the vehicle can also be suppressed.

Thus, in the present invention, by devising the shape of the vertical wall portion of the cowl top panel to curve, it is possible to suppress the vibration of the cowl top panel and the dash panel while suppressing the weight increase without adding other members. can be done. Therefore, according to the above configuration, it is possible to suppress the vibration of the windshield glass and prevent the occurrence of muffled noise in the passenger compartment while suppressing the increase in weight.

In the present invention, deformation of the cowl top panel in the longitudinal direction of the vehicle is suppressed without adding any other member. It is not obstructed by other members. Therefore, in the above configuration, the cowl top panel deforms and absorbs impact when a pedestrian collides, so pedestrian protection performance is not impaired.

The cowl top panel further has a first flange extending rearward of the vehicle from the lower end of the vertical wall portion. The first flange and the second flange are curved arcuately so that the center in the vehicle width direction protrudes rearward of the vehicle in a plan view.

According to the above configuration, the first flange of the cowl top panel and the second flange of the dash panel joined thereto are formed in a curved arc shape so that the center in the vehicle width direction protrudes rearward of the vehicle. For this reason, compared to the case where the first flange of the cowl top panel and the second flange of the dash panel are simply formed in a flat shape extending in the vehicle front-rear direction, the vertical wall portion of the cowl top panel and the dash panel are positioned closer to each other in the vehicle front-rear direction. difficult to transform. Therefore, vibrations of the cowl top panel and the dash panel in the longitudinal direction of the vehicle can be further suppressed.

The cowl top panel further has a flat portion extending forward of the vehicle from the upper end of the vertical wall portion and extending over a predetermined range in the vehicle width direction including the center of the vertical wall portion in the vehicle width direction. forms a U-shaped cross section together with the vertical wall portion and the second flange of the dash panel when viewed from the side.

Since the flat portion and vertical wall portion of the cowl top panel and the second flange of the dash panel form a U-shaped cross section, the cowl top panel is more difficult to deform and vibration is suppressed. be able to.

The above vehicle front structure further includes a steering support member arranged behind the dash panel and the cowl top panel and extending in the vehicle width direction, both ends of which are fixed to the side surfaces of the vehicle body to support various parts; A reinforcing member extending in the vehicle front-rear direction and extending between the center of the wall in the vehicle width direction and the steering support member is provided.

According to the above configuration, the stiffening member connects the center of the curved vertical wall portion of the cowl top panel that most projects rearward in the vehicle width direction to the steering support member. Therefore, the highly rigid steering support member supports the center of the vertical wall of the cowl top panel in the vehicle width direction, thereby reliably suppressing the deformation of the cowl top panel and preventing the occurrence of vibration. can be done.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these examples are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a perspective view showing a vehicle front structure 100 according to an embodiment of the invention. FIG. 2 is a cross-sectional view of the vehicle front structure 100 of FIG. 1 taken along the line AA. In each figure below, the front and rear directions of the vehicle are indicated by arrows Front and Back, the left and right directions of the vehicle width are indicated by arrows Left and Right, and the vertical directions of the vehicle are indicated by arrows Up and Down.

The vehicle front structure 100 includes a dash panel 102 and a cowl top panel 104 as shown in FIG. Dash panel 102 is a member that partitions vehicle interior 105 and power unit mounting room 106, as shown in FIG. 2, and has a surface that extends in the vertical direction of the vehicle. The cowl top panel 104 extends across the width of the vehicle above the dash panel 102 and supports a windshield glass 108 indicated by a dashed line in FIG.

The vehicle front structure 100 further includes dash side panels 109 and 110, a highly rigid steering support member 112, and a cowl front panel 114 shown in FIG. The dash side panels 109 and 110 are a pair of members that mutually support the dash panel 102 as shown in FIG. 1, and are attached to both ends of the dash panel 102 in the vehicle width direction.

The steering support member 112 is arranged behind the dash panel 102 and the cowl top panel 104 and extends in the vehicle width direction. The various parts are, for example, meters attached to the instrument panel, instrument panel supporting parts constituting the instrument panel such as audio equipment, and steering parts such as a steering wheel, a steering shaft, and a steering column.

A reinforcement 116 and a brace 118 are attached to the steering support member 112 as reinforcing parts located on the driver's seat side of the vehicle body. The reinforcement 116 extends linearly from the steering support member 112 to the cowl top panel 104 as shown in FIG. The brace 118 extends linearly from a floor panel (not shown) and is connected to the steering support member 112 . A reinforcement 120 for attaching various pedals is joined to the dash panel 104 .

The cowl front panel 114 extends in the longitudinal direction of the vehicle below the cowl top panel 104 as shown in FIG. 2 and is joined to the dash panel 102 and the cowl top panel 104 .

The cowl top panel 104 also has a vertical wall portion 122, a first flange 124, and a flat portion 126 as shown in FIG. The cowl top panel 104 further has a sloped portion 128 that slopes along the windshield glass 108 and an upwardly projecting top portion 130 . The cowl top panel 104 as a whole is inclined so as to approach the dash panel 102 toward the rear of the vehicle from the top portion 130 .

The vertical wall portion 122 extends vertically just before reaching the dash panel 102 as shown in FIG. The vertical wall portion 122 is a portion surrounded by a dotted line B in FIG. 1, extends over the dash panel 102 in the vehicle width direction, and has dash side panels 109 and 110 positioned at both ends thereof. The first flange 124 extends rearward of the vehicle from a lower end 132 of the vertical wall portion 122 shown in FIG. 2, and further extends in the vehicle width direction as shown in FIG.

A plane portion 126 of the cowl top panel 104 is a portion surrounded by a dotted line C in FIG. It covers a predetermined range in the vehicle width direction including.

A second flange 138 is formed at the upper end of the dash panel 102 and is bent toward the rear of the vehicle as shown in FIG. The cowl front panel 114 also has a third flange 140 extending rearward of the vehicle.

The second flange 138 of the dash panel 102 overlaps and joins the third flange 140 of the cowl front panel 114 from below at a position on the front side of the vehicle relative to the vertical wall portion 122 as shown in FIG. The second flange 138 overlaps and joins the third flange 140 from below at a position on the rear side of the vehicle relative to the vertical wall portion 122, and further, through the third flange 140, the first flange 124 of the cowl top panel 104. It overlaps from below and is indirectly joined to this.

Since the dash panel 102 has a surface extending in the vertical direction of the vehicle, it may vibrate in the longitudinal direction of the vehicle during running. The cowl top panel 104 supports the windshield glass 108 , extends in the longitudinal direction of the vehicle as a whole, and is joined to a second flange 138 formed at the upper end of the dash panel 102 .

Therefore, if the cowl top panel 104 vibrates not only in the longitudinal direction of the vehicle but also in the vertical direction of the vehicle due to the vibration of the dash panel 102 in the longitudinal direction of the vehicle, the windshield glass 108 does not detect the vibration of the cowl top panel 104 in the vertical direction of the vehicle. Directional vibration is transmitted. In such a case, the windshield glass 108 vibrates in the direction perpendicular to the plane, causing muffled noise in the vehicle interior 105 .

Therefore, in the vehicle front structure 100, by devising the shape of the cowl top panel 104, it is possible to suppress the vibration of the cowl top panel 104 and the dash panel 102 while suppressing the weight increase without adding other members. A configuration was adopted.

FIG. 3 is a top view of the vehicle front structure 100 of FIG. FIG. 4 is a diagram showing a state in which the vehicle front structure 100 of FIG. 1 is viewed obliquely from below. In the vehicle front structure 100, as shown in FIG. 3, the vertical wall portion 122 of the cowl top panel 104 has a curved shape such that the center 136 in the vehicle width direction projects most toward the rear of the vehicle.

Further, of the cowl top panel 104 shown in FIG. 3, a front end portion 142 including the inclined portion 128 and the top portion 130 is curved such that a center 144 in the vehicle width direction projects most forward of the vehicle. Furthermore, in the cowl top panel 104 , the curvature of the curved vertical wall portion 122 is smaller than the curvature of the curved front end portion 142 , and the vertical wall portion 122 curves more gently than the front end portion 142 . For this reason, the cowl top panel 104 forms an elliptical shape that is front-rear asymmetric when viewed from above as shown in FIG.

In the cowl top panel 104, a first flange 124 extending rearward of the vehicle from a lower end 132 (see FIG. 2) of the curved vertical wall portion 122 projects rearward of the vehicle at a center 146 in the vehicle width direction as shown in FIG. It has a curved arc shape. A second flange 138 formed at the upper end of the dash panel 102 has a curved arcuate shape such that a center 148 in the vehicle width direction protrudes rearward of the vehicle, as shown in FIG.

Further, in the cowl top panel 104, as shown in FIG. 2, the plane portion 126 forms a U-shaped cross section together with the vertical wall portion 122 and the second flange 138 of the dash panel 102 when viewed from the side. The cowl top panel 104 forms an L-shaped cross section when viewed from the side as shown in FIG.

In the vehicle front structure 100, as shown in FIG. 3, the vertical wall portion 122 of the cowl top panel 104 is curved such that the center 136 in the vehicle width direction projects most toward the rear of the vehicle. Therefore, the cowl top panel 104 is less likely to be deformed in the longitudinal direction of the vehicle due to the curved vertical wall portion 122, and vibrations in the longitudinal direction and the vertical direction of the vehicle can be suppressed.

In the vehicle front structure 100, the first flange 124 of the cowl top panel 104 is joined to the second flange 138 formed at the upper end of the dash panel 102 as shown in FIG. Therefore, by suppressing the vibration of the cowl top panel 104, the vibration of the dash panel 102 in the longitudinal direction of the vehicle can also be suppressed.

As described above, in the vehicle front structure 100, by devising a shape in which the vertical wall portion 122 of the cowl top panel 104 is curved, the cowl top panel 104 and the dash panel can be installed without adding other members while suppressing an increase in weight. 102 vibration can be suppressed. Therefore, according to the vehicle front structure 100, it is possible to suppress the vibration of the windshield glass 108 while suppressing an increase in weight, thereby preventing the occurrence of muffled noise in the passenger compartment.

Further, in the vehicle front structure 100, deformation of the cowl top panel 104 in the vehicle front-rear direction is suppressed without adding other members. As a result, for example, when a pedestrian contacts the windshield glass 108 from the front of the vehicle, the deformation of the cowl top panel 104 is not hindered by other members. Therefore, in the vehicle front structure 100, the cowl top panel 104 deforms and absorbs impact when a pedestrian collides, so that the pedestrian protection performance is not impaired.

Further, in the vehicle front structure 100, as shown in FIGS. 3 and 4, the first flange 124 of the cowl top panel 104 and the second flange 138 of the dash panel 102 joined thereto are positioned at the center 146 in the vehicle width direction, 148 is formed in a curved arc shape so as to protrude rearward of the vehicle.

Therefore, compared to the case where the first flange 124 of the cowl top panel 104 and the second flange 138 of the dash panel 102 are simply formed in a flat shape extending in the vehicle front-rear direction, the vertical wall portion 122 of the cowl top panel 104 and the dash panel 104 are arranged in a flat shape. It becomes difficult for the panel 102 to deform in the longitudinal direction of the vehicle. Therefore, in the vehicle front structure 100, the vibration of the cowl top panel 104 and the dash panel 102 in the longitudinal direction of the vehicle can be further suppressed.

Further, in the vehicle front structure 100, as shown in FIG. 2, a U-shaped cross section is formed by the flat portion 126 and the vertical wall portion 122 of the cowl top panel 104 and the second flange 138 of the dash panel 102 when viewed from the side. . Therefore, the cowl top panel 104 is more difficult to deform, and the occurrence of vibration can be suppressed.

FIG. 5 is a diagram showing a modification of the vehicle front structure 100 of FIG. FIG. 6 is a DD sectional view of the vehicle front structure 100A of FIG. The vehicle front structure 100A of the modified example differs from the vehicle front structure 100 described above in that a reinforcing member 150 is provided.

The reinforcing member 150 is a member extending in the longitudinal direction of the vehicle as shown in FIG. A rear end 154 is joined to the steering support member 112 .

In other words, the reinforcement member 150 spans between the vehicle width direction center 136 of the curved vertical wall portion 122 of the cowl top panel 104 and the steering support member 112, which projects most toward the rear of the vehicle. It connects support members 112 .

Therefore, in the vehicle front structure 100A, the highly rigid steering support member 112 supports the center 136 of the vertical wall portion 122 of the cowl top panel 104 in the vehicle width direction, thereby ensuring deformation of the cowl top panel 104. It is possible to suppress and prevent the occurrence of vibration. Therefore, according to the vehicle front structure 100A, it is possible to suppress the vibration of the windshield glass 108 and prevent the occurrence of muffled noise in the vehicle interior while suppressing an increase in weight.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used for a vehicle front structure.

DESCRIPTION OF SYMBOLS 100, 100A... Vehicle front part structure 102... Dash panel 104... Cowl top panel 105... Vehicle interior 106... Power unit installation room 108... Windshield glass 109, 110... Dash side panel 112... Steering support member , 114 ... cowl front panel, 116, 120 ... reinforcement, 118 ... brace, 122 ... vertical wall portion, 124 ... first flange, 126 ... flat portion, 128 ... inclined portion, 130 ... top portion, 132 ... vertical wall portion Lower end 134 Upper end of vertical wall portion 136 Center of vertical wall portion in vehicle width direction 138 Second flange 140 Third flange 142 Front end portion of cowl top panel 144 Vehicle width of front end portion Center in direction 146 Center of first flange in vehicle width direction 148 Center of second flange in vehicle width direction 150 Reinforcing member 152 Front end of reinforcing member 154 Rear end of reinforcing member

Claims (4)

A dash panel that separates the vehicle compartment and the power unit installation room,
a cowl top panel that is joined to the upper end of the dash panel in the vehicle width direction and supports the windshield glass,
The cowl top panel has a vertical wall portion extending vertically just before reaching the dash panel,
The vehicle front structure, wherein the vertical wall portion of the cowl top panel is curved such that the center in the vehicle width direction protrudes most rearward of the vehicle. The cowl top panel further has a first flange extending rearward of the vehicle from the lower end of the vertical wall portion,
The upper end of the dash panel is formed with a second flange that is bent toward the rear of the vehicle and that overlaps and is joined to the first flange of the cowl top panel from below,
2. The vehicle front structure according to claim 1, wherein each of the first flange and the second flange has an arcuate shape in which the center in the vehicle width direction is curved so as to protrude rearward of the vehicle in a plan view. . The cowl top panel further has a flat portion extending forward of the vehicle from the upper end of the vertical wall portion and extending over a predetermined range in the vehicle width direction including the center of the vertical wall portion in the vehicle width direction,
3. The vehicle front structure according to claim 2, wherein the planar portion forms a U-shaped cross section together with the vertical wall portion and the second flange of the dash panel when viewed from the side. The vehicle front structure further includes:
a steering support member arranged behind the dash panel and the cowl top panel and extending in the vehicle width direction and having both ends fixed to the side surfaces of the vehicle body to support various parts;
4. The reinforcing member extending in the longitudinal direction of the vehicle and extending between the center of the vertical wall portion of the cowl top panel in the vehicle width direction and the steering support member. The vehicle front structure according to item 1.

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