JP5510778B2 - Body structure around the dash panel - Google Patents

Description

  The present invention relates to a vehicle body structure around a dash panel of an automobile.

  In an automobile equipped with an engine compartment at the front of the vehicle body, the engine compartment and the compartment are defined by a dash panel, and a cowl top panel and a dash upper panel that define the lower edge of the front window opening at the top of the dash panel Are joined. Patent Document 1 discloses that the left and right strut towers and the center portion of the cowl front panel positioned in front of the cowl top panel are connected by a bar, but the cowl front panel itself has sufficient support rigidity. There is no effective reinforcement structure.

  On the other hand, the lower part of the dash panel is joined to the floor panel that defines the passenger compartment floor surface, and the lower center of the dash panel is connected to the floor tunnel part of the floor panel and forms a funnel-like shape that forms the introduction part of the floor tunnel. The connecting portion extends rearward (see, for example, Patent Document 2). The floor tunnel is only the exhaust pipe storage space in the FF vehicle, but the 4WD vehicle and FR vehicle have the propeller shaft storage space. In either case, the floor tunnel is also a reinforcing structure that gives rigidity to the center of the floor. Yes. Patent Document 2 discloses that a heat shield that also serves as a reinforcement is provided at the joint between the floor tunnel and the dash panel, but the reinforcement of the entire dash panel is not considered.

JP-A-2-267083 JP 7-165122 A

  In this way, the dash panel is a bulkhead that blocks vibration, noise, and heat from the engine compartment, and at the same time, has a side as a structural element related to ride comfort and handling stability. The reinforcement of the engine room and the lower part of the dash panel and the floor tunnel were individually examined, and there was a problem that was not considered as the entire structure including the dash panel or its surroundings.

  The present invention has been made in view of such a situation, and an object thereof is to construct an overall and comprehensive reinforcing structure from the upper part to the lower part of the dash panel.

In order to solve the above-described problems of the prior art, the present invention provides a vehicle body structure around a dash panel of an automobile, the dash upper panel being joined to the upper part of the dash panel and projecting rearward from the joined part, A floor tunnel introduction part extending rearward from the lower center of the dash panel, a reinforcing panel joined across the vehicle room side upper surface and both side faces of the floor tunnel introduction part, the dash panel, and left and right strut towers; In what comprises a pair of left and right strut tower braces that connect
A pair of left and right reinforcements joined to the passenger compartment side of the dash panel and extending and joined in a vertical direction between the dash upper panel and the floor tunnel introducing portion, and each of the reinforcements and the A closed cross section is formed between the dash panel, a lower end of each reinforcement is joined to an upper surface of the reinforcing panel, and at least a part of a joining portion of each strut tower brace in the dash panel is It is characterized by being superposed in the thickness direction across the junction of each reinforcement and the dash panel .

The preferred embodiment of the present invention has the following features in addition to the above.
The vehicle further includes an external reinforcing panel that is joined across the engine chamber side upper surface and both inner side surfaces of the floor tunnel introduction part, and that both ends in the vehicle width direction are joined to the floor side member.
The pair of left and right strut tower braces are plate-like, and are arranged so that the width direction thereof is the vertical direction.

  Since the vehicle body structure around the dash panel according to the present invention is configured as described above, a three-dimensional structure with a closed cross section that connects the floor tunnel introduction part at the lower center of the dash panel and the dash upper panel by a pair of left and right reinforcements. By forming a reinforcing structure and improving the rigidity of the center of the dash panel, the vibration of the dash panel, especially the vibration of the dash upper panel that protrudes into the passenger compartment, is reduced. In addition, it can contribute to the improvement of steering stability.

  Accordingly, vibration / noise prevention members such as dash insulators and vibration control panels can be reduced or simplified, which is advantageous for weight reduction and productivity improvement.

Moreover, further comprising a reinforcing panel joined over the cabin side top and both side surfaces of the floor tunnel introduction, since the lower end of each reinforcement is bonded to the upper surface of the reinforcing panel, floor tunnel inlet portion The rigidity described above is improved, and the above-described effects become more remarkable. In particular, improving the rigidity of the center of the dash contributes to improving the torsional rigidity of the entire vehicle body, and is advantageous in improving ride comfort and handling stability.

The dash panel further includes a pair of left and right strut tower braces that connect the left and right strut towers, and at least a part of the joints of the strut tower braces on the dash panel is connected to the joints of the reinforcements. Since the dash panel is polymerized in the thickness direction, the rigidity of the dash panel side joint of the strut tower brace is increased by the dash panel reinforcement structure as described above, and the strut tower brace is used as a starting point from the strut tower brace. The integration of the dash panel and the members from the floor tunnel introduction part to the floor tunnel is advantageous in improving the torsional rigidity of the vehicle body.

In the aspect of the present invention, in the aspect further comprising an external reinforcing panel joined across the engine chamber side upper surface and both inner side surfaces of the floor tunnel introducing portion and both ends in the vehicle width direction are joined to the floor side member, A series of reinforcing structures are formed from the upper part of the panel to the floor side member through the left and right reinforcements, the vehicle room side reinforcing panel, and the external reinforcing panel, and the above-described effects become more remarkable. In particular, the central portion of the external reinforcing panel has a layout that matches the reinforcing panel on the passenger compartment side, which is advantageous in that a synergistic reinforcing effect can be obtained.

  Furthermore, in the aspect in which the pair of left and right strut tower braces are plate-shaped and are arranged so that the respective width directions are in the vertical direction, the joint portion of each strut tower brace in the dash panel extends in the vertical direction. The joints between the left and right reinforcements that exist are aligned over the long section, so that a higher reinforcement effect can be obtained, and the integration of the members from the strut tower to the floor tunnel is enhanced, and the three-dimensional The torsional rigidity of the vehicle body can be further improved by a simple reinforcing structure.

It is the perspective view which looked at the dash panel vicinity of the motor vehicle which enforced the reinforcement structure which concerns on this invention from the engine compartment side. It is the perspective view which looked at the dash panel vicinity of the motor vehicle which enforced the reinforcement structure which concerns on this invention from the compartment side. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, a vehicle 1 is a front engine vehicle having an engine compartment 2 at the front of a vehicle body, and an engine compartment 2 and a compartment 3 (passenger compartment) are defined by a dash panel 4. First, the basic structure around the dash panel 4 will be described.

  A front lower portion of a cowl top panel 41 extending in the vehicle width direction is joined to the engine compartment 2 side of the upper portion of the dash panel 4 at a joint portion 40 so as to define a lower edge of the front window 30. On the other hand, as shown in FIG. 2, a dash upper panel 42 protruding rearward from the joint 40 is joined to the vehicle compartment 3 side above the dash panel 4, and the cowl top panel 41 and the dash upper panel 42 are connected to each other. A substantially closed cross section extending in the vehicle width direction is defined therebetween.

  Cowl side panels 21 and 21 (cowl side inner members) extending forward along the both side portions of the engine compartment 2 are joined to the left and right sides of the cowl top panel 41, and further, lamp support members 25, 25, and the front end portions of the left and right lamp support members 25, 25 are connected to each other by an upper cross member 26 so as to surround the upper portion of the engine compartment 2.

  A pair of left and right strut towers 22, 22 are joined to the cowl side panels 21, 21 on the engine compartment 2 side, and the lower portions of the strut towers 22, 22 are the upper edge portions of the left and right front side members 23, 23. It is joined to. The rear portions of the front side members 23 and 23 are curved downward along the lower portion of the dash panel 4 and expanded outward in the vehicle width direction, and are continuous with the left and right floor side members 33 and 33. Yes.

  On the other hand, as shown in FIG. 2, dash side panels 43 and 43 are joined to the left and right sides of the dash upper panel 42, and side body outer panels 34 and 34 are joined to the outer surface side thereof. The above-described cowl side panels 21 and 21 are joined to the front side of the panels 34 and 34.

  The center portion 4a of the dash panel 4 bulges toward the vehicle compartment 3 with respect to the side portions 4b, and further, a floor tunnel introduction portion 4c extending rearward from the lower portion is formed, and the floor tunnel introduction portion 4c is interposed therebetween. Connected to the floor tunnel 32. The floor tunnel introduction portion 4 c forms an introduction portion that expands toward the engine compartment 2 at the front end portion of the floor tunnel 32. Further, the left and right lower portions of the dash panel 4 are joined to the front end portions of the floor panels 31 and 31 via lower panels 44 and 44, respectively.

  As described above, the reinforcing structure of the dash panel 4 on the vehicle compartment 3 side is an inverted U-shaped reinforcing panel extending over the upper surface and both side surfaces of the floor tunnel introducing portion 4c of the dash panel 4 as shown in FIG. 45 is joined. In the illustrated example, the reinforcing panel 45 is joined to a transition portion that transitions from the bulged center portion 4a of the dash panel 4 to the floor tunnel introduction portion 4c, and both side surfaces of the transition portion are connected from the side portions 4b to the center portion 4a. Since it is comprised by one surface which followed the inclined surface which goes, the both sides | surfaces of the reinforcement panel 45 are each comprised by the flat inclined surface.

  Further, a pair of left and right reinforcements 46, 46 extending in the vertical direction are arranged between the upper surface side of the floor tunnel introduction portion 4 c reinforced by the reinforcing panel 45 and the lower surface 42 a bulging the dash upper panel 42. It is installed. As shown in FIG. 4, each reinforcement 46, 46 has a hat-shaped cross section in which the middle part except for the upper and lower ends is uniform in the longitudinal direction. 4a, and a closed cross section extending in the vertical direction is formed inside each of them. As shown in FIGS. 2 and 3, the upper and lower end portions 46b of the D-shaped upper panel 42 are formed at the upper and lower ends 46b. The lower surface 42a and the reinforcing panel 45 are joined to each other.

  On the other hand, as shown in FIG. 1, the reinforcing structure of the dash panel 4 on the side of the engine compartment 2 is substantially hat-like as a whole over the ceiling surface and both inner side surfaces of the floor tunnel introducing portion 4c and the lower surfaces of the dash panel 4 on both sides. The external reinforcing panel 47 bent in a shape is joined. As shown in FIG. 3, the external reinforcing panel 47 is substantially uniform in the extending direction so as to define a closed cross section between the dash panel 4 and the inclined joint surface of the floor tunnel introducing portion 4c. It has a hat-shaped or angle-shaped cross-sectional shape, and is disposed so as to overlap with the above-described reinforcing panel 45 on the side of the passenger compartment 3 in the section of the floor tunnel introduction portion 4c, and is spot-welded repeatedly, The left and right floor side members 33 and 33 are rigidly joined at both ends in the vehicle width direction.

  Further, as shown in FIG. 1, a pair of left and right strut tower braces 24, 24 that connect the left and right sides of the central portion 4 a of the dash panel 4 and the left and right strut towers 22, 22 are provided. The strut tower braces 24, 24 are each formed in a plate shape and are disposed so that the width direction is the vertical direction. 22 and 22 also have a property as a partition partitioning both corners behind.

  As shown in FIGS. 1 and 3, the joint portions of the left and right strut tower braces 24, 24 to the dash panel 4 include joint portions 24 a, 24 a that coincide with the joint portions of the reinforcements 46, 46 in the passenger compartment 3. In addition, at the joint portions 24a and 24a, the dash panel 4 is spot-welded in an overlapping manner with the dash panel 4 being sandwiched from both inside and outside. By having such joint portions 24a and 24a, the support rigidity of the left and right strut tower braces 24 and 24 is increased, and a stronger integration with the left and right strut towers 22 and 22 is achieved.

  Furthermore, both corners partitioned by the left and right strut tower braces 24, 24 are suitable for installation space for supplementary notes in the engine compartment 2, and in the embodiment shown in FIG. An angular projecting portion 24c is formed at an intermediate portion of the strut tower brace 24, and a housing space for the battery 5 is defined behind the projecting portion 24c. The left strut tower brace 24 is formed with two reinforcing beads extending in the longitudinal direction across the bent portion of the joint surface.

  In the reinforcing structure of the dash panel 4 as described above, the floor tunnel introducing portion 4c at the lower center of the dash panel 4 and the dash upper panel 42 are connected with a closed cross-sectional structure by a pair of left and right reinforcements 46, 46. Thus, the rigidity of the entire dash panel 4 including the central portion 4a is improved, and vibrations of the dash panel 4 and the dash upper panel 42 projecting into the vehicle compartment 3 are suppressed.

  Furthermore, the reinforcement panel 45 joined over the upper surface and both side surfaces of the floor tunnel introduction part 4c, and the external reinforcement joined over the ceiling surface on the engine room 2 side of the floor tunnel introduction part 4c and both inner side surfaces. The panel 47 reinforces the floor tunnel introduction portion 4c of the dash panel 4 from both the inside and outside, and the reinforcing structure having such a closed cross section is provided on the floor side members 33 and 33 (front side members) via the external reinforcing panel 47. 23, 23) and the reinforcement structure of the reinforcements 46, 46 connecting the upper and lower sides, the rigidity of the dash panel central portion 4a is improved in each stage, and the ride comfort and the operation stability are improved. It is advantageous for improving the performance.

  Further, by the reinforcement structure (45, 46, 47) of the dash panel 4 as described above, the rigidity of the dash panel side joint portion of the strut tower braces 24, 24 is improved, whereby the reinforcement by the strut tower braces 24, 24 is achieved. The effect is enhanced and the torsional rigidity of the vehicle body is improved. In particular, as shown in FIGS. 1 and 4, the joint portions 24 a and 24 a of the strut tower braces 24 and 24 in the dash panel 4 are joined to the joint portions (46 a and 46 a of the left and right reinforcements 46 and 46 on the vehicle compartment 3 side. ), A higher reinforcing effect is obtained, and the left and right strut towers 22 and 22 are used as starting points, from the strut tower braces 24 and 24 to the dash panel 4 and from the floor tunnel introduction part 4c to the floor tunnel 32. This is advantageous in improving the torsional rigidity of the vehicle body.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. .

  For example, in the above-described embodiment, the case where the lower ends of the left and right reinforcements 46 and 46 are joined to the upper surface of the reinforcement panel 45 joined to the floor tunnel introduction portion 4c is shown, but the reinforcement panel 45 may be omitted. In this case, the lower ends of the reinforcements 46 and 46 are directly joined to the upper surface of the floor tunnel introducing portion 4c.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine compartment 3 Car compartment 4 Dash panel 4a Center part 4b Both side parts 4c Floor tunnel introduction part 21 Cowl side panel 22 Strut tower 23 Front side member 24 Strut tower brace 31 Floor panel 32 Floor tunnel 33 Floor side member 41 Cowl top Panel 42 Dash upper panel 43 Dash side panel 45 Reinforcement panel 46 Reinforce 47 External reinforcement panel

Claims (3)

A vehicle body structure around a dash panel of an automobile, the dash upper panel being joined to the upper part of the dash panel and projecting rearward from the joined part, and the floor tunnel introduction part extending rearward from the lower center of the dash panel And a reinforcing panel joined across the vehicle compartment side upper surface and both side surfaces of the floor tunnel introduction part, and a pair of left and right strut tower braces connecting the dash panel and the left and right strut towers . ,
A pair of left and right reinforcements joined to the passenger compartment side of the dash panel and extending and joined in a vertical direction between the dash upper panel and the floor tunnel introducing portion, and each of the reinforcements and the A closed cross section is formed between the dash panel, a lower end of each reinforcement is joined to an upper surface of the reinforcing panel, and at least a part of a joining portion of each strut tower brace in the dash panel is A vehicle body structure around a dash panel characterized by overlapping in the thickness direction across the junction of each reinforcement and the dash panel. The vehicle further comprises an external reinforcing panel that is joined to the engine room side upper surface and both inner side surfaces of the floor tunnel introduction portion and that both ends in the vehicle width direction are joined to the floor side member. 1. The vehicle body structure around the dash panel according to 1 . 2. The vehicle body structure around a dash panel according to claim 1 , wherein the pair of left and right strut tower braces have a plate shape and are arranged such that their width directions are in the vertical direction.

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