JP6257432B2 - Auto body front structure - Google Patents

Description

The present invention relates to a vehicle body front structure including a dash panel that partitions an engine room and a vehicle interior, and a cowl member disposed on an upper portion of the dash panel, and more particularly, vibrations of the dash panel and the cowl member. The present invention relates to an improvement of a reinforcing structure that can suppress a roaring sound in a vehicle interior caused by the vehicle.

A dash panel that partitions the engine room and the passenger compartment is disposed at the front of the vehicle body, and a cowl member that extends in the vehicle width direction is disposed at an upper portion of the dash panel. In such a vehicle body front structure, there is a problem that a roaring sound in the passenger compartment is likely to be generated due to vibrations of the dash panel and the cowl member due to vehicle vibration.

As a conventional vehicle body front part structure that can suppress the squeaking noise by suppressing vibration of the dash panel, for example, Patent Document 1 discloses a reinforcement that extends across the entire width in the vehicle width direction in the middle part in the vertical direction of the dash panel. A structure is disclosed in which a member is fixed by welding, and a closed cross section is formed that extends across the entire width in the vehicle width direction between the reinforcing member and a midway portion of the dash panel.

JP 2004-130976 A

In the conventional structure, although the rigidity of the dash panel can be improved, the reinforcing member resonates with the natural vibration of the vehicle due to the fact that the reinforcing member is provided over substantially the entire width in the vehicle width direction, and a roaring sound is generated by the resonance. Sometimes it gets bigger. If the size of the reinforcing member is simply reduced in order to avoid this resonance, the rigidity is lowered and the vibration of the dash panel cannot be reliably suppressed.

The present invention has been made in view of the above-described conventional situation, and can improve the rigidity of the dash panel and the cowl member while avoiding resonance with the natural vibration of the vehicle and suppressing the roaring sound in the vehicle interior. The challenge is to provide a structure.

The present invention includes a dash panel that partitions an engine room and a vehicle interior, a cowl member that is fixed to the upper portion of the dash panel and extends in the vehicle width direction, and a front lower portion of the dash panel that extends in the vehicle front-rear direction. In the vehicle body front structure including a right side member and a reinforcing member disposed on the rear surface of the dash panel,
The reinforcing member extends over substantially the entire width in the vehicle width direction, and includes an upper reinforcing portion that joins the upper portion of the dash panel and the lower portion of the cowl member, and extends downward following the upper reinforcing portion, and the left and right And a lower reinforcing part coupled to only one of the side members.

According to the vehicle body front portion structure of the present invention, the upper reinforcing portion extending over substantially the entire width of the reinforcing member is coupled to the upper portion of the dash panel and the lower portion of the cowl member, and the upper reinforcing portion. Subsequently, a lower reinforcing portion extending downward is coupled to either the left or right side member. For this reason, it is possible to significantly reinforce the coupling of the cowl member, which tends to be a seismic source, with the input of vibration from the tire, and to effectively suppress vibrations that use the cowl member as the seismic source, resulting in suppression of roaring noise in the passenger compartment. it can.

Moreover, since the reinforcement member which consists of an upper reinforcement part and a lower reinforcement part was fixed to the dash panel, the rigidity of dash panel itself can be improved. On the other hand, since the lower reinforcing portion of the reinforcing member is connected to only the left or right side member, the increase in rigidity due to the connecting of the reinforcing member to the dash panel is different in the vehicle width direction. Since it is difficult to resonate with vibration and therefore difficult to resonate, the roaring sound in the passenger compartment can also be suppressed from this point.

In addition, when only the upper reinforcing part is set to a size that spans the entire width in the vehicle width and the lower reinforcing part is coupled to only one side member, the entire reinforcing member is provided to span the entire width in the vehicle width direction. Compared to, weight and cost can be reduced, and productivity can be improved.

It is the model perspective view seen from the vehicle interior side of the vehicle body front part structure according to Embodiment 1 of the present invention. It is the model front view seen from the vehicle interior side of the said vehicle body front part structure. FIG. 3 is a schematic cross-sectional side view (a cross-sectional view taken along line III-III in FIG. 2) of the vehicle body front structure. It is the model front view seen from the vehicle interior side of the vehicle body front part structure according to Embodiment 2 of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 3 are views for explaining a front body structure of an automobile according to Embodiment 1 of the present invention. In this embodiment, front, rear, left, and right mean front, rear, left, and right when looking forward from the vehicle interior side.

  In the figure, 1 is an engine room formed in the front part of the automobile, 2 is a vehicle compartment, and the engine room 1 and the vehicle compartment 2 are partitioned by a dash panel 3 arranged across the entire width in the vehicle width direction. It has been. A lower portion 3a of the dash panel 3 is folded so as to incline toward the passenger compartment 2, and a front end portion 4a of the floor panel 4 is overlapped and coupled to the lower portion 3a.

A flange portion 3b is bent at the upper end portion of the dash panel 3 toward the front of the vehicle, and a bottom wall 5a of a cowl panel (cowl member) 5 is fixed on the flange portion 3b. The cowl panel 5 is disposed between a windshield (not shown) and a hood that opens and closes the engine room 1 and extends in the vehicle width direction so as to connect vehicle body components such as left and right apron members. Yes.

The cowl panel 5 includes the bottom wall 5a, front and rear vertical walls 5b and 5b, which are bent to stand upward from the front and rear edges of the bottom wall 5a, and the front and rear vertical walls. It is made of a sheet metal having a cross-sectional hat shape having flange portions 5c and 5c in which upper ends of 5b and 5b are bent in the front and rear directions of the vehicle. Although not shown, a cowl cover is disposed on the upper surface of the cowl panel 5.

Further, left and right side members 6 and 6 are disposed on the left and right sides of the lower surface of the floor panel 4 so as to extend in the vehicle front-rear direction. The left and right side members 6, 6 include a floor portion 6 a located on the lower surface side of the floor panel 4, an inclined portion 6 b located on the front side of the lower portion 3 a of the dash panel 3, and the interior of the engine room 1. And the engine room portion 6c is disposed so as to be displaced above the floor portion 6a so as to form a step.

Each of the side members 6 has a cross-sectional hat shape having a bottom wall 6d, side walls 6e, 6e, and upper end flange portions 6f, 6f. The flange portions 6f are welded to the lower portions of the floor panel 4 and the dash panel 3. It is fixed.

A reinforcing plate (reinforcing member) 7 is disposed on the rear surface of the dash panel 3 located on the vehicle compartment 2 side, and is fixed by welding. The reinforcing plate 7 is located on the cowl panel 5 side, and includes an upper reinforcing portion 8 that joins an upper portion of the dash panel 3 and a lower portion of the cowl panel 5, and a lower edge 8 a of the upper reinforcing portion 8. The lower reinforcement portion 9 extends downward to the upper edge 3c of the lower portion 3a of the panel 3.

The upper reinforcing portion 8 extends over substantially the entire width in the vehicle width direction, and extends from the lower edge 8a in contact with the rear surface of the dash panel 3 toward the lower edge of the vertical wall 5b of the cowl panel 5. An inclined portion 8b extending while inclining inward, and a flange portion 8c formed on the upper edge of the inclined portion 8b and fixed to the lower edge of the vertical wall 5b of the cowl panel 5 are provided. The inclined portion 8b, the upper portion of the dash panel 3, and the bottom wall 5a of the cowl panel 5 form a closed cross section A having a triangular shape in the cross section and extending over substantially the entire width in the vehicle width direction.

The lower reinforcing portion 9 has a trapezoidal shape extending downward following the lower edge 8 a of the upper reinforcing portion 8. One bottom side of the trapezoid located on the upper side is constituted by the lower edge 8a, and the other bottom side 9a located on the lower side is the left side, that is, the flange portion 6f of the side member 6 on the passenger seat side. It is located so as to overlap the boundary portion 6f 'between the inclined portion 6b and the engine room portion 6c. The left leg side 9b of the lower reinforcing part 9 extends vertically downward from the left end of the lower edge 8a of the upper reinforcing part 8, while the right leg side 9c is inclined from the right end of the lower edge 8a toward the bottom side 9a. It extends to.

The bottom side 9a portion of the lower reinforcing portion 9 is welded and fixed to the boundary portion 6f ′ of the flange portion 6f together with the lower edge 3c portion of the dash panel 3, that is, in a three-layered manner. In the figure, the x marks indicate spot welding points.

According to the vehicle body front structure according to the present embodiment, the upper portion of the dash panel 3 and the lower portion of the vertical wall 5b of the cowl panel 5 are formed by the upper reinforcing portion 8 extending over the entire width of the reinforcing plate 7 in the vehicle width direction. By connecting, a closed cross section A extending substantially the entire width in the vehicle width direction is formed, and a lower side 9a portion on the lower side of the lower reinforcing portion 9 extending downward following the upper reinforcing portion 8 is formed on the left side member 6. Combined. Therefore, the rigidity of the coupling portion between the cowl panel 5 and the dash panel 3 that is likely to be a seismic source due to the vibration input from the tire can be greatly increased, and the vehicle body is moved in the width direction by the inverted Karman vortex S1 with the cowl panel 5 as the epicenter. The force F pushing toward the direction can be generated, and the movement can be effectively suppressed. As a result, the roaring sound in the passenger compartment 2 can be suppressed.

In addition, since the reinforcing plate 7 composed of the upper reinforcing portion 8 and the lower reinforcing portion 9 is fixed to the dash panel 3, the rigidity of the dash panel 3 itself can be improved. On the other hand, since the lower reinforcing portion 9 of the reinforcing plate 7 is coupled only to the left side member 6, the increase in rigidity caused by coupling the reinforcing plate 7 to the dash panel 3 differs in the vehicle width direction. Since it is difficult to resonate with the natural vibration, and therefore, it is difficult to resonate, the roaring sound in the passenger compartment 2 can be suppressed from this point.

Furthermore, only the upper reinforcing portion 8 is set to a size that extends over the entire width in the vehicle width direction, and the lower reinforcing portion 9 is trapezoidal and is connected to only one of the side members 6. Compared to the case where it is provided over the entire width, the weight and cost can be reduced, and the productivity can be improved.

  FIG. 4 is a diagram for explaining a second embodiment of the present invention, in which the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

The reinforcing plate 7 according to the second embodiment includes an upper reinforcing portion 8 that is the same as that of the first embodiment, and a lower reinforcing portion 9 ′ that extends downward following the lower edge 8 a of the upper reinforcing portion 8. .

The lower reinforcing portion 9 'includes a left side 9b' that extends downward from the left end of the lower edge 8a, a right side 9c 'that extends downward from a portion located slightly to the right of the center of the lower edge 8a in the vehicle width direction, It has a rectangular shape having a lower side 9a 'connecting the lower ends of the left and right sides 9b' and 9c '. The left side of the lower side 9a ′ is welded and fixed to the flange portion 6f of the left side member 6 in a three-layer manner with the lower part of the dash panel 3 interposed.

Also in the second embodiment, the same effect as the first embodiment can be obtained.

In the above embodiment, the lower part of the reinforcing plate 7 is coupled only to the left side member 6. However, the lower part of the reinforcing plate 7 according to the present invention may be coupled only to the right side member.

Moreover, although the said Example demonstrated the case where the reinforcement member was comprised with the plate, the reinforcement member of this invention may be not only a plate shape but a beam shape.

1 Engine room 2 Car compartment 3 Dash panel 5 Cowl panel (Cowl member)
6 Side member 7 Reinforcement plate (reinforcement member)
8 Upper reinforcement 9 Lower reinforcement

Claims (1)

A dash panel that partitions the engine room and the vehicle interior, a cowl member that is fixed to the upper part of the dash panel and extends in the vehicle width direction, and a left and right side member that extends in the vehicle front-rear direction and is joined to the lower front portion of the dash panel And a vehicle body front part structure including a reinforcing member disposed on a rear surface of the dash panel,
The reinforcing member extends over substantially the entire width in the vehicle width direction, and an upper reinforcing portion that joins the upper portion of the dash panel and the lower portion of the cowl member;
An in-vehicle front part structure for an automobile, comprising a lower reinforcing part that extends downward following the upper reinforcing part and is coupled to only one of the left and right side members.

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