JP2015174610A - Front body structure of the vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body front part structure of a vehicle that can be manufactured easily and reduce vibration of a panel of a front window glass due to oscillation and deformation of an opening part that a cowl member forms.SOLUTION: The vehicle body front part structure of a vehicle comprises: a cowl panel 9 and a dash upper panel 7, which extend in a vehicle width direction, supports a lower end part of a front window glass 8 from below and form a cowl opening part 10 opened toward a front side of the vehicle; and a reinforcing member 30, both ends of which are connected to the cowl panel 9 and the dash upper panel 7 respectively so as to extend from the upper part to the lower part of the cowl opening part 10. The reinforcing member 30 is bent at a bending part 30c, and a vibration attenuation member 32 is arranged in the bending part 30c.

Description

  The present invention relates to a front body structure of a vehicle, and more particularly, to a vehicle having a cowl member that extends in the vehicle width direction, supports a lower end portion of a front window glass from below, and forms an opening opening forward of the vehicle. It relates to the front body structure.

  Conventionally, it has been known that a cowl box structure including a cowl panel has an open cross-sectional structure with an open top (so-called open cowl structure) in order to mitigate an impact when a collision object collides with the front of the vehicle. It has been. However, in the case of such an open cowl structure, the opening formed by the dash upper panel on the upper side of the dash panel and the cowl panel swings and deforms, and the panel vibration of the front window glass joined to the cowl panel increases. There was a problem that it became a booming noise and made the passengers in the vehicle uncomfortable.

  For example, Patent Literature 1 proposes a technique for solving such a problem. In Patent Document 1, a reinforcing body that connects a cowl upper member and a cowl lower member is used to suppress swinging deformation of the opening, and at the overlapping portion of the reinforcing body between the first reinforcing portion and the second reinforcing portion. There has been proposed a technique for attenuating vibration by a vibration damping member provided.

JP2013-82245A

The technique disclosed in Patent Document 1 described above has the following problems.
The reinforcing body as disclosed in Patent Document 1 applies an uncured vibration damping member to the gap (specifically, the overlapping portion) between the first reinforcing portion and the second reinforcing portion, and heats in this state. By doing so, the vibration damping member is cured (heat cured). It is convenient to attach such a reinforcing body to the vehicle in a vehicle body assembly process in which a frame member, a panel member, or the like is assembled to assemble the vehicle body. This is because the heating operation is performed in the painting process after the vehicle body assembling process, so that the uncured vibration damping member can be heated and cured together in the painting process. By the way, in the painting process, after the electrodeposition painting process in which the electrodeposition coating is applied, an intermediate coating and topcoating process is performed to improve the appearance quality of the vehicle body. After the electrodeposition liquid is adhered by being immersed in the landing liquid, the electrodeposition liquid is dried and baked on the vehicle body in a heating and drying furnace. Further, after such a painting process, a vehicle assembly process is performed in which various parts such as a windshield and a door glass are assembled to the vehicle body to assemble the vehicle.
However, it is difficult to attach the reinforcing body disclosed in Patent Document 1 to the vehicle in the vehicle body assembly process. This is because it is difficult to apply the vibration damping member to the gap between the first reinforcing portion and the second reinforcing portion after the first reinforcing portion and the second reinforcing portion in the reinforcing body are joined to the vehicle. Specifically, it is difficult to accurately apply the vibration damping member to the gap between the first reinforcing portion and the second reinforcing portion that are joined to the vehicle.
Therefore, in the technique disclosed in Patent Document 1, a reinforcing body in which the vibration damping member between the first reinforcing portion and the second reinforcing portion is hardened in advance is separately prepared (that is, vibration is performed in a process different from the painting process). It is necessary to prepare a reinforcing body in which the damping member is cured) and to attach this reinforcing body typically in a vehicle assembly process (or a vehicle body assembly process). Therefore, the technique disclosed in Patent Document 1 has a problem that productivity is low. Moreover, since the reinforcing body as described above is separately prepared, there is a problem that the number of parts increases.

  The present invention has been made to solve the above-described problems of the prior art, is easy to manufacture, and reduces panel vibration of the front window glass caused by the rocking deformation of the opening formed by the cowl member. An object of the present invention is to provide a vehicle front body structure that can be used.

In order to achieve the above object, the present invention provides a vehicle front body structure that extends in the vehicle width direction, supports a lower end portion of a front window glass from below, and has an opening that opens to the front of the vehicle. A cowl member to be formed, and reinforcing members whose ends are connected to the inner wall surface of the cowl member so as to extend from the upper part to the lower part of the opening part of the cowl member, and the reinforcing member is bent at the bent part. In addition, a vibration damping member is disposed at the bent portion.
In the present invention configured as described above, the reinforcing member is connected to the inner wall surface of the cowl member so that the reinforcing member extends from the upper part to the lower part of the opening part of the cowl member. Oscillating deformation due to cross-sectional collapse can be suppressed. In addition, since the reinforcing member is bent at the bent portion, and the vibration damping member is disposed at the bent portion, the vibration is also generated when the opening winds and deforms and the front window glass vibrates. Can be attenuated, that is, vibration can be reduced. Specifically, the angle of the bent portion of the reinforcing member changes repeatedly during vibration, and at this time, a compressive strain and a tensile strain are generated in the vibration damping member disposed in the bent portion, and this strain energy (in the vibration damping member) The vibration can be attenuated by converting the energy stored in (2) into thermal energy.
Furthermore, according to the present invention, the reinforcing member can be easily manufactured. Specifically, the vibration damping member can be easily and accurately applied to the bent portion of the reinforcement member after the reinforcement member is attached to the cowl member. Therefore, according to the present invention, the reinforcing member is attached in the vehicle body assembly process, and the vibration damping member in the uncured state is attached in the painting process after the vehicle body assembly process (specifically, in the heating and drying furnace in the electrodeposition coating process). It can be cured by heating. Therefore, according to the present invention, there is no need to separately prepare a reinforcing member in which the vibration damping member is hardened in advance, that is, it is not necessary to heat and cure the vibration damping member in a process separate from the painting process. Can be improved. Also, the number of parts does not increase.

In this invention, Preferably, it has further the movement suppression member which one end was connected by the bending part vicinity of the reinforcement member, and the other end was connected to the member different from a reinforcement member.
In the present invention configured as described above, since the movement suppressing member is connected in the vicinity of the bent portion of the reinforcing member, the movement of the bent portion of the reinforcing member due to vibration can be suppressed. As a result, the angle change of the bent portion can be easily caused during vibration, and the vibration damping function of the vibration damping member disposed in the bent portion can be effectively ensured.

In the present invention, preferably, a concave portion that is recessed downward is formed in the bent portion of the reinforcing member, and a vibration damping member is disposed in the concave portion.
In the present invention configured as described above, since the concave portion is formed in the bent portion of the reinforcing member, and the vibration damping member is disposed in the concave portion, the portion where the concave portion is not formed in the reinforcing member is relatively placed during vibration. The concave portion of the bent portion can be relatively easily deformed, and the deformation of the vibration damping member can be promoted. Therefore, vibration can be effectively attenuated by the vibration damping member.

In the present invention, the cowl member is preferably constituted by a cowl panel having an S-shaped cross section.
In the present invention configured as described above, since a cowl member constituted by a cowl panel having an S-shaped cross section is used, a wide space behind the cowl member can be secured, and the degree of freedom in interior design is improved. It becomes possible. In addition, the front projecting structure with the S-shaped cross section ensures the support rigidity of the front window glass, and in addition, energy can be absorbed step by step when a collision load is input.

  According to the vehicle front body structure of the present invention, it is easy to manufacture, and the panel vibration of the front window glass caused by the rocking deformation of the opening formed by the cowl member can be reduced.

It is the perspective view which looked at the front body structure of the vehicle by a 1st embodiment of the present invention from the vehicle interior. It is sectional drawing seen along the XI-XI line in FIG. It is an expansion perspective view of the reinforcing member by a 1st embodiment of the present invention. It is sectional drawing of the front part vehicle body structure of the vehicle by 2nd Embodiment of this invention. It is an expansion perspective view of the reinforcement member by 2nd Embodiment of this invention. It is sectional drawing of the front vehicle body structure of the vehicle by 3rd Embodiment of this invention. It is sectional drawing of the front part vehicle body structure of the vehicle by the 1st modification of embodiment of this invention. It is sectional drawing of the front vehicle body structure of the vehicle by the 2nd modification of embodiment of this invention.

  Hereinafter, a vehicle front body structure according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
First, with reference to FIG. 1 thru | or FIG. 3, the front vehicle body structure of the vehicle by 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view of a front body structure of a vehicle according to a first embodiment of the present invention as viewed from the inside of a vehicle compartment, and FIG. 2 is a cross-sectional view taken along the line XI-XI in FIG. FIG. 3 is an enlarged perspective view of the reinforcing member according to the first embodiment of the present invention. In FIG. 2, arrow F indicates the front direction of the vehicle, and arrow U indicates the upward direction of the vehicle (the same applies to other drawings).

1 and 2, a dash lower panel 2 as a dash panel is joined and fixed between the left and right hinge pillars 1 and 1 (only the hinge pillar on the right side of the vehicle is shown in the drawing). The rear compartment 4 is partitioned in the front-rear direction.
The front pillar 5 is joined and fixed to the upper part of the above-described hinge pillar 1 so that the front part is low and the rear part is high.
Further, a floor panel 6 is joined and fixed to the lower rear end of the dash lower panel 2 described above. The floor panel 6 extends substantially horizontally toward the rear and constitutes the bottom surface of the passenger compartment 4. The floor panel 6 projects into the passenger compartment 4 at the center of the floor panel 6 in the vehicle width direction, and is a vehicle. A tunnel portion extending in the front-rear direction is integrally formed.

As shown in FIGS. 1 and 2, a dash upper panel 7 is joined and fixed to the upper bent portion 2 a of the dash lower panel 2 described above. The rear end portion of the cowl panel 9 that supports the inclined lower end portion of the front window glass 8 is bonded and fixed to the upper portion of the dash upper panel 7.
In this vehicle front body structure, an opening 10 (hereinafter referred to as a “cowl opening” as appropriate) that opens in the front of the vehicle by a cowl panel 9 and a dash upper panel 7 as cowl members that extend in the vehicle width direction of the vehicle. .) Is formed.
The front end 7a of the above-described dash upper panel 7 is provided with a cowl front panel 11 that is joined to the rear end 11a and extends forward. Between the front vertical wall 11b of the cowl front panel 11 and in the vehicle width direction. A cowl cross member 13 is attached to the front upper side of the cowl front panel 11 so as to form an extended closed section 12.
The dash upper panel 7, the cowl panel 9, the cowl front panel 11, and the cowl cross member 13 form a so-called open cowl structure cowl box 14 that extends in the vehicle width direction.

Incidentally, as shown in FIG. 1, a suspension tower 15 is disposed at a position spaced forward from the dash lower panel 2 described above. An apron reinforcement 16 extending forward from the upper part of the hinge pillar 1 is provided outside the suspension tower 15 in the upper vehicle width direction.
The apron reinforcement 16 is a vehicle body rigid member that includes an apron rain outer and an apron rain inner. A front side frame 17 is connected to the inside of the suspension tower 15 in the lower vehicle width direction, and the front side frame 17 is provided substantially in parallel with the apron reinforcement 16 described above.
The front side frame 17 described above is a vehicle body rigid member that extends in the front-rear direction of the vehicle on both side portions of the engine room 3. The front side frame 17 is connected to the lower portion of the suspension tower 15 and has a rear end portion. Is curved downward and connected to the front portion of the floor frame 18.

  As shown in FIGS. 1 and 2, a dash upper panel 7 that forms the above-described cowl opening 10 and a lower end portion of the front window glass 8 are supported by extending forward from an upper portion of the dash upper panel 7. The cowl panel 9 includes a rear end portion 7b of the dash upper panel 7 and a rear end portion 9b of the cowl panel 9, which are joined and fixed to each other and connect the cowl panel 9 and the dash upper panel 7 in a substantially vertical direction. 30 is provided.

As shown in FIGS. 2 and 3, the reinforcing member 30 is formed of, for example, an iron plate, a bent piece 30 a is integrally formed at the upper end portion, and a bent piece 30 b is integrally formed at the lower end portion. . In the reinforcing member 30, a bent piece 30a at the upper end is joined and fixed to the lower surface of the front end of the cowl panel 9 so as to extend from the upper part to the lower part of the cowl opening 10, and the bent piece 30b at the lower end is dash. The upper panel 7 is bonded and fixed to the front surface of the flat portion.
Further, the reinforcing member 30 is bent at the bent portion 30c to be formed in a cross-sectional shape, and the vibration damping member 32 is disposed in the bent portion 30c. Specifically, the reinforcing member 30 is bent so as to protrude rearward of the vehicle, and a portion of the bent portion 30c on the vehicle front side, that is, a surface of a portion of the reinforcing member 30 above the bent portion 30c and the reinforcing member 30 are provided. A vibration damping member 32 having a triangular prism shape is disposed at a location sandwiched by the surface of the portion below the bent portion 30c (see FIG. 3). More specifically, at the corner formed by the surface of the portion above the bent portion 30c of the reinforcing member 30 and the surface of the portion of the reinforcing member 30 below the bent portion 30c, these two surfaces are located at the smaller angle portion. A vibration attenuating member 32 is disposed so as to come into contact with.
The vibration damping member 32 is applied in a paste-like uncured state to the bent portion 30c of the reinforcing member 30, and is then cured by heating. For example, as the vibration damping member 32, an acrylic or silicone material having a loss coefficient (20 ° C., 30HZ) of 0.2 or more is used.
Further, as shown in FIG. 1, the reinforcing member 30 described above is a position at which the length of the front window glass 8 in the vehicle width direction is substantially divided into two, that is, the vehicle width direction intermediate portion of the cowl opening 10 (vehicle width direction). (Center part).

  In FIG. 1, the reinforcing member 30 is provided in the vehicle width direction intermediate portion of the cowl opening 10, but the position where the reinforcing member 30 is provided is not limited thereto. What is necessary is just to set suitably the vehicle width direction position in the reinforcement member 30, and the number of the reinforcement members 30 according to the vibration mode to suppress. In one example, the reinforcing member 30 may be provided at a position where the length of the cowl opening 10 in the vehicle width direction is approximately divided into three, that is, the reinforcing member 30 may be provided at two positions on the left and right sides of the cowl opening 10. Good. In another example, the reinforcing members 30 may be provided at a total of three locations in the center in the vehicle width direction and on the left and right in the vehicle width direction.

  Next, the function and effect of the vehicle front body structure according to the first embodiment of the present invention will be described.

According to the first embodiment, by applying the reinforcing member 30 whose both ends are connected to the inner wall surfaces of the cowl panel 9 and the dash upper panel 7 so as to extend from the upper part to the lower part of the cowl opening 10, Oscillation deformation due to collapse of the cross section of the opening 10 can be suppressed.
Further, according to the first embodiment, even when the cowl opening 10 swings and deforms and the front window glass 8 vibrates in the panel, the vibration damping member 32 disposed in the bent portion 30c of the reinforcing member 30 can The vibration can be attenuated, that is, the vibration can be reduced. Specifically, during vibration, the bent portion 30c of the reinforcing member 30 repeatedly opens and closes, that is, the angle of the bent portion 30c changes repeatedly. At this time, the compression force is applied to the vibration damping member 32 provided in the bent portion 30c. Further, a compressive strain and a tensile strain are generated by applying a tensile force, and this strain energy (energy stored in the vibration damping member 32) is converted into thermal energy, so that vibration can be damped.
As described above, according to the first embodiment, it is possible to effectively suppress panel vibration of the front window glass 8 caused by the rocking deformation of the cowl opening 10.

Furthermore, according to the first embodiment, the reinforcing member 30 can be easily manufactured. Specifically, according to the first embodiment, the bent pieces 30 a and 30 b of the reinforcing member 30 are joined and fixed to the cowl panel 9 and the dash upper panel 7, respectively, and then vibration is attenuated to the bent portion 30 c of the reinforcing member 30. The member 32 can be appropriately applied. More specifically, according to the first embodiment, unlike the technique disclosed in Patent Document 1, the vibration damping member is provided between two members (first reinforcing portion and second reinforcing portion) separated in the reinforcing body. Instead of applying, the vibration damping member 32 is applied to the bent portion 30c formed to be recessed toward the vehicle rear side in the reinforcing member 30, so that this application work can be performed easily and accurately. Further, when the vibration damping member 32 is applied to such a bent portion 30c, the applied vibration damping member 32 is unlikely to sag, so that it is not necessary to hold the vibration damping member 32 so as not to sag.
Therefore, according to the first embodiment, the reinforcing member 30 is attached in the vehicle body assembly process, and in the painting process after the vehicle body assembly process (specifically, in the heating and drying furnace in the electrodeposition coating process), the vibration in an uncured state. The damping member 32 can be cured by heating. Therefore, according to the first embodiment, as in the technique disclosed in Patent Document 1, it is necessary to separately prepare a reinforcing body in which the vibration damping member between the first reinforcing portion and the second reinforcing portion is cured in advance. Since there is no need to heat and cure the vibration damping member in a process different from the coating process, productivity can be improved. Further, according to the first embodiment, the number of parts does not increase as in the technique disclosed in Patent Document 1.

[Second Embodiment]
Next, a front vehicle body structure for a vehicle according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view of a front body structure of a vehicle according to a second embodiment of the present invention, and FIG. 5 is an enlarged perspective view of a reinforcing member according to the second embodiment of the present invention. The vehicle front body structure according to the second embodiment is applied instead of the vehicle front vehicle body structure according to the first embodiment shown in FIG. 1, and FIG. This corresponds to a cross-sectional view taken along line XI-XI in FIG. 1 when the front vehicle body structure of the vehicle according to the second embodiment is applied.
In the following, the configuration different from that of the first embodiment will be mainly described, and description of the same configuration as that of the first embodiment will be omitted as appropriate (in FIG. 4 and FIG. 5, the same components as those of the first embodiment will be omitted). The same reference numerals are attached). That is, the configuration that is not particularly described here is the same as that of the first embodiment.

  As shown in FIGS. 4 and 5, in the vehicle front body structure according to the second embodiment, in addition to the reinforcing member 30 described above, one end thereof is joined and fixed to the bent portion 30 c of the reinforcing member 30 and the other end is fixed. A movement restraining member 40 is further provided that is sandwiched and fixed between the cowl panel 9 and the dash upper panel 7. Specifically, the movement suppressing member 40 is formed of, for example, an iron plate, and a bent piece 40a is integrally formed at the front end portion. The bent piece 40a is bonded and fixed to a surface of the bent portion 30c on the vehicle rear side, that is, a surface on the side where the vibration damping member 32 is not provided in the bent portion 30c. Further, the rear end portion 40b of the movement suppressing member 40 is sandwiched between the rear end portion 7b of the dash upper panel 7 and the rear end portion 9b of the cowl panel 9, and is fixedly bonded to each other.

  The effect similar to that of the first embodiment described above can also be obtained by the vehicle body structure of the vehicle according to the second embodiment. In particular, according to the second embodiment, the movement suppressing member 40 attached to the reinforcing member 30 can suppress the movement of the position of the bent portion 30c of the reinforcing member 30 due to vibration. For example, it is possible to prevent the position of the bent portion 30c from moving while the angle of the bent portion 30c is substantially maintained. Therefore, according to the second embodiment, it is possible to easily cause an angle change of the bent portion 30c during vibration compared to the first embodiment described above, and the vibration damping member 32 disposed in the bent portion 30c. The vibration damping function can be more effectively ensured.

In the example shown in FIGS. 4 and 5, one end (the bent piece 40 a) of the movement suppressing member 40 is connected so as to come into contact with the corner as the bent portion 30 c of the reinforcing member 30. If the movement of the position of the bent portion 30c can be suppressed, one end of the movement suppressing member 40 may be connected to a position spaced apart from the corner as the bent portion 30c to some extent.
4 and 5, the other end (rear end portion 40b) of the movement suppressing member 40 is sandwiched between the cowl panel 9 and the dash upper panel 7, but the cowl panel 9 or the dash The other end of the movement suppressing member 40 may be connected to the upper panel 7, and if the movement of the position of the bent portion 30 c due to vibration can be suppressed, the movement suppressing member 40 can be connected to members other than the cowl panel 9 and the dash upper panel 7. The ends may be connected. However, it is desirable to connect the other end of the movement suppressing member 40 to a member other than the reinforcing member 30 from the viewpoint of securing the movement of the bent portion 30c.

[Third Embodiment]
Next, a front vehicle body structure of a vehicle according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of a front body structure of a vehicle according to a third embodiment of the present invention. The vehicle front body structure according to the third embodiment is applied instead of the vehicle front vehicle body structure according to the first embodiment shown in FIG. 1, and FIG. This corresponds to a cross-sectional view taken along line XI-XI in FIG. 1 when the front body structure of the vehicle according to the third embodiment is applied.
In the following, the configuration different from the first and second embodiments will be mainly described, and the description of the same configuration as the first and second embodiments will be omitted as appropriate (in FIG. 6, the first and second embodiments are different from the first and second embodiments). The same components are denoted by the same reference numerals). That is, the configuration that is not particularly described here is the same as in the first and second embodiments.

  As shown in FIG. 6, in the vehicle front body structure according to the third embodiment, a reinforcing member 50 in which a recessed portion 50 d is formed in a bent portion 50 c is provided instead of the reinforcing member 30 described above. Specifically, the reinforcing member 50 is formed with a concave portion 50d having a semicircular cross section that is recessed downward and on the vehicle rear side at a portion below the bent portion 50c (the concave portion 50d has a hemispherical shape). The vibration damping member 52 may be disposed in the recess 50d. The reinforcing member 50 has a bent piece 50a integrally formed at the front end portion, a bent piece 50b integrally formed at the lower end portion, and the bent piece 50a at the upper end portion is the front end of the cowl panel 9. The bent piece 50b at the lower end is joined and fixed to the front surface of the flat portion of the dash upper panel 7.

The effect similar to that of the first and second embodiments described above can also be obtained by the vehicle body structure of the vehicle according to the third embodiment. In particular, according to the third embodiment, the concave portion 50d formed in the bent portion 50c of the reinforcing member 50 prevents the portion where the concave portion 50d is not formed in the reinforcing member 50 from relatively moving during the vibration. The recess 50d of 50c can be relatively easily deformed, and the deformation of the vibration damping member 52 can be promoted. Therefore, vibration can be effectively attenuated by the vibration attenuating member 52.
The deformation of the vibration damping member 52 is promoted in this manner because the bent portion 50c formed with the recess 50d extends to the rear side of the vehicle as compared to the bent portion formed flat as it is without forming the recess 50d. This is because, since the length is increased, the amount of displacement during vibration is increased, the (bending) rigidity is decreased, and deformation is easily performed.

  Further, according to the vehicle front body structure of the vehicle according to the third embodiment, since the concave portion 50d of the reinforcing member 50 is recessed downward, when the vibration damping member 52 is applied to the concave portion 50d, the applied vibration damping is applied. The member 52 is less likely to sag.

  In addition, although the example of the recessed part 50d which has a semicylindrical shape was shown in FIG. 6, you may apply the recessed part which has various shapes, such as a triangular prism shape and a quadratic prism shape.

[Modification]
Below, the further modification of embodiment of this invention is demonstrated. Here, the configuration different from the above-described embodiment will be mainly described, and the description of the same configuration as the above-described embodiment will be appropriately omitted. That is, the configuration not particularly described here is the same as that of the above-described embodiment.

  First, a front vehicle body structure of a vehicle according to a first modification of the embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of a front body structure of a vehicle according to a first modification of the embodiment of the present invention. The vehicle front body structure according to the first modification is applied in place of the vehicle front vehicle body structure according to the first embodiment shown in FIG. 1, and FIG. This corresponds to a cross-sectional view taken along line XI-XI in FIG. 1 when the front vehicle body structure of the vehicle according to the first modification is applied.

  As shown in FIG. 7, in the vehicle front body structure according to the first modification, a reinforcing member 60 having a Z-shaped cross section is provided instead of the above-described reinforcing members 30 and 50. Specifically, the reinforcing member 60 has a bent piece 60a integrally formed at the upper end portion and a bent piece 60b integrally formed at the lower end portion, and the bent piece 60a at the upper end portion is a cowl panel. The bent piece 60 b at the lower end is joined and fixed to the front surface of the flat portion of the dash upper panel 7. Further, in the reinforcing member 60, a corner portion formed by bending the bent piece 60b at the lower end portion is defined as a bent portion 60c, and a vibration damping member 62 is disposed in the bent portion 60c.

The effect similar to that of the above-described embodiment can be obtained by the vehicle body structure of the vehicle according to the first modified example. In particular, according to the first modification, the bent piece 60b at the lower end is joined to the flat portion of the dash upper panel 7, and the vibration damping member 62 is arranged at the bent portion 60c at the rear end of the bent piece 60b. Therefore, when the vibration damping member 62 is applied to the bent portion 60c, the applied vibration damping member 52 is less likely to sag.
Further, according to the first modification, when the bent piece 60b is joined and fixed to the dash upper panel 7, the bent portion 60c at the rear end portion of the bent piece 60b is also fixed. The movement of the bending portion 60c due to vibration can be suppressed without using such a movement suppressing member 40, and as a result, the vibration damping function of the vibration damping member 62 disposed in the bending portion 60c is effectively ensured. be able to.
In the first modification, when the cowl opening 10 swings and deforms, and the front window glass 8 vibrates in the panel, the upper part of the cowl opening 10 is located between the bent pieces 60a and 60b. The portion of the reinforcing member 60 extending downward is bent so as to protrude toward the vehicle front side and the vehicle rear side. According to such deformation of the portion of the reinforcing member 60, a compression strain and a tensile strain are generated in the vibration damping member 62, and this strain energy (energy stored in the vibration damping member 62) is converted into thermal energy to vibrate. Is attenuated.

  Next, a front vehicle body structure of a vehicle according to a second modification of the embodiment of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of a front body structure of a vehicle according to a second modification of the embodiment of the present invention. The vehicle body structure according to the second modification is applied instead of the vehicle body structure according to the first embodiment shown in FIG. 1, and FIG. This corresponds to a cross-sectional view taken along line XI-XI in FIG. 1 when the vehicle front body structure according to the second modification is applied.

  As shown in FIG. 8, in the vehicle body structure according to the second modification, a cowl panel 20 having an S-shaped cross section is provided instead of the dash upper panel 7 and the cowl panel 9 described above. The cowl panel 20 supports an inclined lower end portion of the front window glass 8 and has a substantially C-shaped bulging portion 20a that bulges in an arc shape in front of the vehicle, and a bulging portion 20a below the bulging portion 20a. A vertical wall portion 20b extending downward from the corner radius portion 20r and a lower surface portion 20c extending in a substantially horizontal direction from the lower end of the vertical wall portion 20b to the front of the vehicle via a corner radius portion 20r at the lower portion of the protruding portion 20a. And has a substantially S-shape in side view. In this vehicle front body structure, a cowl opening 25 is formed by a cowl panel 20 as a cowl member.

  Further, the vehicle body structure according to the second modification is provided with a reinforcing member 70 having a Z-shaped cross section similar to the first modification. Specifically, the reinforcing member 70 has a bent piece 70a integrally formed at the upper end portion, a bent piece 70b integrally formed at the lower end portion, and the bent piece 70a at the upper end portion is a cowl panel. The bulged portion 20a is joined and fixed to the lower surface of a substantially flat portion located at the lower portion, and the bent piece 70b at the lower end portion is joined and fixed to the front surface of the lower surface portion 20c of the cowl panel 20. Further, in the reinforcing member 70, a corner portion formed by bending the bent piece 70a at the upper end portion is defined as a bent portion 70c, and a vibration damping member 72 is disposed in the bent portion 70c.

  The effect similar to that of the above-described embodiment can also be obtained by the vehicle body structure according to the second modified example. In particular, according to the second modification, a so-called S-shaped cowl having a bulging portion 20a, a vertical wall portion 20b, and a lower surface portion 20c is adopted as the cowl panel 20, so that the bulging portion 20a causes the cowl panel 20 to A wide rear space can be secured, thereby improving the degree of freedom in interior design, and the front projecting structure of the bulging portion 20a can secure the support rigidity of the front window glass 8 and can input a collision load. Sometimes, energy can be absorbed stepwise by the bulging portion 20a and the vertical wall portion 20b.

2 Dash lower panel 3 Engine room 4 Car compartment 7 Dash upper panel 8 Front window glass 9 Cowl panel 10, 25 Opening (Cowl opening)
11 cowl front panel 13 cowl cross member 14 cowl box 20 cowl panel 30, 50, 60, 70 reinforcement member 30c, 50c, 60c, 70c bent part 32, 52, 62, 72 vibration damping member 40 movement restraining member 50d recess

Claims (4)

A vehicle front body structure,
A cowl member that extends in the vehicle width direction, supports the lower end of the front window glass from below, and forms an opening that opens to the front of the vehicle;
A reinforcing member having both ends connected to the inner wall surface of the cowl member so as to extend from the upper part to the lower part of the opening part of the cowl member;
This reinforcing member is bent at a bent portion, and a vibration damping member is disposed at the bent portion.   The vehicle front body structure according to claim 1, further comprising a movement suppressing member having one end connected to the vicinity of the bent portion of the reinforcing member and the other end connected to a member different from the reinforcing member.   The front body structure of a vehicle according to claim 1 or 2, wherein a concave portion recessed downward is formed in the bent portion of the reinforcing member, and the vibration damping member is disposed in the concave portion.   The front body structure of a vehicle according to any one of claims 1 to 3, wherein the cowl member is constituted by a cowl panel having an S-shaped cross section.

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