JP6172130B2 - Front body structure of the vehicle - Google Patents

Description

  The present invention relates to a front body structure of a vehicle including a cowl panel that supports a front window member, a dash panel that partitions an engine room and a vehicle compartment and is attached to a lower portion of the cowl panel.

  Conventionally, as a front body structure of a vehicle, like a front window support structure exemplified in Patent Document 1, a pedestrian protection performance and a performance to suppress a humming noise caused by vibration of a front window member, so-called NVH In order to achieve both (Noise Vibration Harshness) performance, a structure in which a front window glass is supported on a cowl outer panel via an adhesive is known.

  The front window support structure disclosed in Patent Document 1 is a structure in which a belt-like stay that connects the upper and lower ends of the cowl panel in the vertical direction is provided on the rear side of the cowl panel, and the belt-like stay is provided. Therefore, it is said that the swing of the front window member can be prevented, and both the NVH performance can be improved and the load absorption performance with respect to the impact load input from above can be improved.

  Similar to the belt-like stay, Patent Documents 2 and 3 propose a structure including a reinforcing member that reinforces the cowl panel.

  In Patent Documents 2 and 3, a bulging portion that bulges forward of the vehicle relative to the joint portion with the front window member, a vertical wall portion that extends downward from the bulging portion, and a vehicle front from the lower end of the vertical wall portion. A cowl panel having a bottom surface extending to the bottom, in other words, a portion of the bulging portion that bulges most forward, a boundary portion between the bulging portion and the vertical wall portion, and a boundary portion between the vertical wall portion and the lower surface portion. A cowl panel having bent portions at a total of three locations is disclosed, and a structure in which the cowl panel is reinforced by a reinforcing member joined to the vehicle rear side is disclosed.

  By the way, with the diversification of vehicle designs in recent years, a structure in which the front pillar (A pillar) is lowered rearward with respect to the dash panel, that is, a structure in which the cowl panel and the dash panel are separated from each other is being studied.

  However, as disclosed in Patent Documents 1 to 3, when the cowl panel and the dash panel are separated from each other in the structure including the belt-like stay and the reinforcing member on the rear side of the cowl panel, as described above, The NVH performance and the pedestrian protection performance could not be made sufficiently compatible.

Japanese Patent No. 5557934 JP 2014-121944 A JP 2014-121945 A

  Therefore, an object of the present invention is to improve NVH performance (vibration suppression due to window vibration) while ensuring pedestrian protection performance in a cowl panel structure in which a dash panel is attached to the front of the vehicle.

The present invention is a front vehicle body structure for a vehicle, comprising: a cowl panel that supports a front window member; a dash panel that partitions an engine room and a vehicle compartment and is attached to a lower portion of the cowl panel; The panel has an upper surface portion to which the front window member is joined in a cross-sectional view perpendicular to the vehicle width direction, a vertical surface portion extending downward from the upper surface portion, and extending from the lower end of the vertical surface portion to the front of the vehicle. And a mounting portion to which the dash panel is attached on the lower surface portion is provided so as to be positioned in front of the vehicle with respect to a joining portion to which the front window member is joined on the upper surface portion. Are the first vertical surface portion on the front window member side, the second vertical surface portion on the lower surface portion side, the first vertical surface portion and the second vertical surface portion. A first bent portion that is bent forward of the vehicle, and a second bent portion is formed by the second vertical surface portion and the lower surface portion, and the radius of curvature of the first bent portion is R1, When the radius of curvature of the two bent portions is R2, R2 <R1 is satisfied, and the first vertical surface portion is arranged so as to be inclined in a front-rear and rear-high shape with respect to the lower surface portion. To do.

Further, the present invention is a vehicle front body structure including a cowl panel that supports a front window member, a dash panel that partitions an engine room and a vehicle compartment and is attached to a lower portion of the cowl panel, The cowl panel includes an upper surface portion to which the front window member is joined in a cross-sectional view perpendicular to the vehicle width direction, a vertical surface portion that extends downward from the upper surface portion, and extends from the lower end of the vertical surface portion to the front of the vehicle. An attachment portion to which the dash panel is attached on the lower surface portion is provided so as to be positioned in front of the vehicle with respect to the joining portion to which the front window member is joined on the upper surface portion, and The surface portion includes a first vertical surface portion on the front window member side, a second vertical surface portion on the lower surface portion side, the first vertical surface portion, and the second A first bent portion bent forward of the vehicle formed by the surface portion, and a second bent portion is formed by the second vertical surface portion and the lower surface portion, and the radius of curvature of the first bent portion is R1. When the radius of curvature of the second bent portion is R2, the cowl panel is composed of two or more divided panels in a cross-sectional view perpendicular to the vehicle width direction, satisfying R2 <R1, and the divided portions of the divided panels Is arranged in the second bent portion or in the vicinity of the second bent portion in the lower surface portion, and the thickness of the panel closer to the dash panel than the divided portion is closer to the front window member than the divided portion. It is characterized by being thicker than the thickness of the panel.

According to the above-described invention , in the cowl panel structure in which the dash panel is attached to the front side of the vehicle, it is possible to improve the NVH performance while ensuring the pedestrian protection performance.

Further, as in the latter invention, the cowl panel is configured by two or more divided panels in a cross-sectional view perpendicular to the vehicle width direction, and the divided portions of the divided panels are arranged in the second bent portion, or in the lower surface portion. The panel on the dash panel side is arranged near the second bent portion, and the thickness of the panel closer to the dash panel than the divided portion is larger than the thickness of the panel closer to the front window member than the divided portion. The NVH performance can be exhibited by the panel on the front window member side, and the pedestrian protection performance can be demonstrated by the panel on the front window member side, and the overall weight can be reduced compared to the case where a single panel has a constant thickness. Become.

  According to the aspect of the present invention, the second bent portion is located in front of the vehicle with respect to the first bent portion in a side view of the vehicle.

  According to the above configuration, since the second bent portion is located in front of the vehicle with respect to the first bent portion in a side view of the vehicle, the NVH performance is improved by enhancing the vibration relaxation function of the second bent portion. Further improvement can be achieved.

  According to the aspect of the present invention, the distance in the height direction between the joint portion of the front window member and the second bent portion is A, and the distance in the height direction between the joint portion of the front window member and the first bent portion is B. , B / A satisfies 0.3 or less.

According to the above configuration, the ratio B / A of the distance B in the height direction between the joined portion of the front window member and the first bent portion with respect to the distance A in the height direction between the joined portion of the front window member and the second bent portion. Therefore, the NVH performance can be further improved by enhancing the vibration relaxation function of the second bent portion .

  According to the present invention, in the cowl panel structure in which the dash panel is attached to the front side of the vehicle, NVH performance (vibration suppression due to window vibration) can be improved while ensuring pedestrian protection performance.

The top view of the vehicle provided with the front body structure concerning the embodiment of the present invention. XX sectional view taken on the line in FIG. 3 is an enlarged view of regions Z1 and Z2 in FIG. The perspective view which looked at the cowl panel concerning this embodiment from vehicles front and upper direction. Sectional drawing which shows the other Example of the front part vehicle body structure of a vehicle. Sectional drawing which shows the further another Example of the front part vehicle body structure of a vehicle. Sectional drawing which shows the further another Example of the front part vehicle body structure of a vehicle. The characteristic view which shows the difference in the NVH performance of each Example goods and comparative example goods of this invention. The characteristic view which shows the difference of the pedestrian performance of the Example goods and comparative example goods of this invention. Sectional drawing which shows the other Example of the cowl panel of this invention. The partially expanded sectional view which shows other Example of the cowl panel of this invention. Sectional drawing which shows the comparative example of the front part vehicle body structure of a vehicle.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a front body structure of a vehicle according to the present invention, FIG. 1 shows a plan view of a vehicle provided with a front body structure according to Embodiment 1 of the present invention, and FIG. 2 shows an XX line arrow in FIG. FIG. 3A shows an enlarged view of a region Z1 in FIG. 2, and FIG. 3B shows an enlarged view of the region Z2 in FIG. 4 is a perspective view of the cowl panel as viewed from the front and above the vehicle, FIG. 5 is a sectional view taken along line XX in FIG. 1 showing Example 2 of the front body structure of the vehicle, and FIG. FIG. 7 is a sectional view taken along the line XX of FIG. 1 showing a third embodiment of the vehicle front body structure, and FIG. 7 is a line XX arrow of FIG. 1 showing the fourth embodiment of the vehicle front body structure. FIG. 8 is a characteristic sectional view showing a difference in NVH performance between the examples 1 to 4 of the present invention and the comparative example, and FIG. 9 is a characteristic view of the example 1 and the comparative example. FIG. 10 is a cross-sectional view of another embodiment of the cowl panel of the present invention, and shows a cross-sectional view showing an enlarged part of the region Z3. 11 (a) is a sectional view corresponding to a region Z3 in FIG. 10 showing another embodiment of the cowl panel of the present invention, and FIG. 11 (b) is a cowl panel of the present invention. Panel further shows a cross-sectional view corresponding to the region Z3 in FIG. 10 showing another embodiment of. FIG. 12 is a cross-sectional view showing a comparative example of the front body structure of the vehicle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the vehicle 1 according to the first embodiment includes a bonnet 3 that covers the engine room 2, a dash panel 5 that partitions the engine room 2 and the vehicle compartment 4, and A cowl panel 6 disposed above the dash panel 5 and a cowl front panel 7 extending forward from the front end of the cowl panel 6 are provided. In the figure, arrow F indicates the front of the vehicle.

  As shown in FIG. 2, the bonnet 3 is configured by joining an outer panel 31 that constitutes an outer surface and an inner panel 32 that constitutes a surface on the engine room 2 side. The bonnet 3 is connected to the vehicle body via hinges (not shown) at both rear ends in the vehicle width direction, and is supported by the hinges so that the rear ends can be opened and closed.

  As described above, the dash panel 5 extends over substantially the entire width in the vehicle width direction, partitions the engine room 2 and the vehicle compartment 4 and supports the cowl panel 6 from below.

  The cowl panel 6 extends in the vehicle width direction and supports the lower end of the front window member 9 over substantially the entire width thereof. Further, as shown in FIG. 1, front pillars 10 and 10 (A pillars 10 and 10) extending rearward and upward of the vehicle are provided at side edges on both sides in the vehicle width direction of the front window member 9, and a cowl panel is provided. The lower ends of the left and right front pillars 10 and 10 are positioned above both ends in the vehicle width direction 6 respectively.

  As shown in FIGS. 2 to 4, the cowl panel 6 includes an upper surface portion 61 to which the front window member 9 is joined in a cross-sectional view perpendicular to the longitudinal direction (vehicle width direction) of the cowl panel 6, and the upper surface portion 61. And a lower surface portion 63 that extends forward from the lower end of the vertical surface portion 62 to which the dash panel 5 is attached, and supports the front window member 9 in a cantilever manner as a whole. It has a shape.

Of cowl panel 6, the upper surface portion 61, the side away from the upper end of the inclined piece 61a and the inclined piece 61a which substantially corresponds to the inclination of the front window member 9 inclined rearward and upward and the front window member 9 A bent piece 61b is provided (see FIGS. 2 and 4). As shown in FIG. 2, the lower lower surface of the front window member 9 is joined to the inclined surface 61a by an adhesive 11 (wind rubber). Accordingly, the front window member 9 is supported on the upper surface portion 61 of the cowl panel 6.

  As shown in FIGS. 2 and 4, the vertical surface portion 62 includes a first vertical surface portion 64 a on the front window member 9 side, a second vertical surface portion 64 b on the lower surface portion 63 side, and a first vertical surface portion in the cross-sectional view. There is a first bent portion 65a that is bent forward of the vehicle and formed by 64a and the second vertical surface portion 64b. Further, the cowl panel 6 is formed with a second bent portion 65 b with a second vertical surface portion 64 b and a lower surface portion 63.

  Each of the first vertical surface portion 64a and the second vertical surface portion 64b is inclined linearly in the front, rear, and rear height, and the first vertical surface portion 64a is more than the second vertical surface portion 64b extending substantially in the vertical direction. Also extends with a gentle slope.

  As shown in FIGS. 2 to 4, the first bent portion 65a is formed in an arc shape that connects the first vertical surface portion 64a and the second vertical surface portion 64b, and the second bent portion 65b is formed of the second vertical surface portion 64b. And an arcuate shape connecting the lower surface portion 63 to each other. 2 and FIGS. 3A and 3B, in Example 1, the radius of curvature of the first bent portion 65a is R1, the radius of curvature of the second bent portion 65b is R2, , The radius of curvature R1 of the first bent portion 65a is set to be approximately four times the radius of curvature R2 of the second bent portion 65b so as to satisfy R2 <R1.

  2 and 3A, a virtual extension line L64a extending linearly from the linear first vertical surface portion 64a and a virtual extension extending linearly from the linear second vertical surface portion 64b. The intersection at which the line L64b intersects is set as a first bending point P65a that protrudes in a protruding manner toward the front (upward) side of the vehicle, and as shown in FIGS. 2 and 3B, a linear second A second bent portion projecting in a projecting manner toward the vehicle rear (downward) side at an intersection where a virtual extension line L64b extending linearly from the vertical surface portion 64b and a virtual extension line L63 extending linearly from the linear lower surface portion 63 intersect. The bending point P65b is set.

  At this time, as shown in FIG. 2, in the first embodiment, the front window member 9 in the upper surface portion 61 is joined in the vehicle front-rear direction position of the first bending point P65a and the second bending point P65b in the vehicle side view. The joint portion 9S (hereinafter, referred to as the “front window joint portion 9S”) is formed so as to ensure the NVH performance by being positioned at the same side or the front side, and in front of the vehicle from the first bending point P65a in the vehicle side view. Are formed such that the second bending point P65b is located at the center.

  The first bending point P65a and the second bending point P65b are at least behind the attachment part 5S to which the dash panel 5 is attached on the lower surface 63 of the cowl panel 6 (hereinafter referred to as “dash panel attachment part 5S”). Located on the side.

  As shown in FIG. 2, in Example 1, the distance in the height direction between the front window joint portion 9S and the second bending point P65b is A, and the distance between the front window joint portion 9S and the first bending point P65a is high. When the distance in the vertical direction is B, B / A is set to be 0.36.

  Further, as shown in FIG. 4, the upper surface portion 61 and the vertical surface portion 62 of the cowl panel 6 substantially correspond to the shape of the lower end of the front window member 9 and bulge toward the front of the vehicle toward the center in the vehicle plan view. Yes.

  On the other hand, as shown in FIGS. 2 and 4, the front end of the lower surface portion 63 has a linear portion at least near the center in the vehicle width direction in the vehicle plan view. Extends substantially linearly in the vehicle width direction.

  As shown in FIG. 2, in the lower surface portion 63, the upper end flange portion 5 a of the dash panel 5 is attached to the lower surface of the cowl panel 6 from the lower side. Thereby, the cowl panel 6 is supported from below by the dash panel 5. And the dash panel attachment site | part 5S in the lower surface part 63 of this cowl panel 6 is set to the position ahead of the vehicle compared with the conventional vehicle front part structure with respect to the front window joining site | part 9S.

  Specifically, as shown in FIG. 2, the distance in the height direction between the front window joint part 9S and the second bending point P65b is A, and the distance in the front-rear direction between the dash panel mounting part 5S and the second bending point P65b is C. , The upper end flange portion 5a of the dash panel 5 is attached to the lower surface portion 63 of the cowl panel 6 so as to satisfy A <C.

  As a result, the front structure of the vehicle 1 of the first embodiment has a design in which the front pillar 10 is lowered rearward with respect to the dash panel 5 as compared with the conventional front structure of the vehicle, that is, the cowl panel 6 and the like. The dash panel 5 is designed to be separated forward and backward.

  Further, the cowl panel 6 of the first embodiment is formed by a single continuous panel in the entire length direction from the front end of the lower surface portion 63 to the rear end of the upper surface portion 61 in a cross-sectional view perpendicular to the vehicle width direction. The cross sections perpendicular to the vehicle width direction are formed with substantially the same plate thickness (see FIGS. 2 and 4).

As shown in FIG. 2, the cowl front panel 7 has a lower surface portion 71 extending in front of the vehicle at the front of the cowl panel 6 at substantially the same height as the lower surface portion 63 of the cowl panel 6 in the sectional view. .

  The rear end of the lower surface portion 71 of the cowl front panel 7 and the front end of the lower surface portion 63 of the cowl panel 6 are joined to each other, and the cowl panel 6 and the cowl front panel 7 are connected to each other in the vehicle width direction. A cowl box with an opening is formed.

  As described above in detail, the front body structure of the vehicle 1 of the first embodiment partitions the cowl panel 6 that supports the front window member 9, the engine room 2, and the vehicle compartment 4, and is attached to the lower part of the cowl panel 6. The cowl panel 6 includes a dash panel 5 and a cowl panel 6. The cowl panel 6 includes an upper surface 61 to which the front window member 9 is joined in a cross-sectional view perpendicular to the vehicle width direction, and a lower portion from the upper surface 61. And a lower surface portion 63 to which the dash panel 5 is attached. The dash panel attachment portion 5S is located forward of the vehicle with respect to the front window joint portion 9S. The vertical surface portion 62 includes a first vertical surface portion 64a on the front window member 9 side, a second vertical surface portion 64b on the lower surface portion 63 side, a first vertical surface portion 64a, and a first vertical surface portion 64a. A first bent portion 65a that is bent forward of the vehicle formed by the vertical surface portion 64b is formed, and a second bent portion 65b is formed by the second vertical surface portion 64b and the lower surface portion 63, and the first bent portion 65a When the radius of curvature is R1, and the radius of curvature of the second bent portion 65b is R2, R2 <R1 is satisfied (see FIGS. 2, 3A, 3B, and 4).

  According to the above configuration, the dash panel 5 can improve NVH performance (vibration suppression due to window vibration) while ensuring pedestrian protection performance in a cowl panel structure attached to the front of the vehicle.

  More specifically, when the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b satisfy R2 <R1, that is, the radius of curvature R2 of the second bent portion 65b is changed to the first bent portion. By setting the curvature radius to be smaller than the curvature radius R1 of 65a, the rigidity of the second bent portion 65b can be increased.

Thereby, the support rigidity of the front window member 921 by the 2nd bending part 65b can be ensured, the vibration relaxation function (damper function) of the whole cantilever-shaped cowl panel 6 can be improved, and it is comprised so that NVH performance may be ensured. be able to.

  In particular, according to the aspect of the first embodiment of the present invention, the second bent portion 65b is located in front of the vehicle with respect to the first bent portion 65a in a side view of the vehicle (see FIG. 2). The NVH performance can be further improved by increasing the vibration relaxation function of the portion 65b.

  Furthermore, when the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b satisfy R2 <R1, the first bend is generated at the first stage (initial stage of deformation) when a collision load is input. The part 65a is deformed and absorbs energy, and the second bent part 65b falls backward and downward in the second stage (later deformation stage) to absorb energy, thereby ensuring pedestrian protection performance. can do.

In addition, according to the cowl panel 6 having the above-described configuration, it is possible to achieve both layout performance as well as pedestrian protection performance and NVH performance.
Specifically, although not shown in the drawing, generally, for example, a wiper part is mounted on the front portion of the cowl panel 6, and in addition, around the cowl panel 6, an instrument panel, an air conditioning duct, etc. Various vehicle parts are installed. For this reason, as described above, when the conventional vehicle front part structure including the stay and the reinforcing member on the rear side of the cowl panel 6 is used, there is a possibility that a problem that the layout property is limited may occur.

  On the other hand, according to the cowl panel 6 having the above-described configuration, the balance between the pedestrian protection performance and the NVH performance can be ensured without providing a belt-like stay or a reinforcing member on the rear side of the cowl panel 6. It becomes easy to secure the surrounding space, and the layout can be ensured.

Hereinafter, cowl panels 6A, 6B, 6C, 6D, 6E, and 6F provided in the front body structure of the vehicle 1 according to another embodiment will be described.
However, although the cowl panels 6A, 6B, 6C, 6D, 6E, and 6F described below are described mainly with respect to the difference from the cowl panel 6 of the first embodiment, they are the same as the cowl panel 6 of the first embodiment described above. About the structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

FIG. 5 is a cross-sectional view showing the front vehicle body structure of the vehicle 1 provided with the cowl panel 6A of the second embodiment.
Also in the cowl panel 6A of the second embodiment, the vehicle front-rear direction positions of the first bending point P65a and the second bending point P65b are the same as or in front of the front window joint portion 9S in the vehicle side view. Unlike Example 1, the second bending point P65b is positioned behind the first bending point P65a in the vehicle side view.
In other words, the angle formed between the second vertical surface portion 64 b and the lower surface portion 63 is an acute angle, and the second vertical surface portion 64 b is disposed so as to be inclined with respect to the lower surface portion 63 in the front-rear and rear-lower positions.

  The relationship between the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b is the same as in Example 1, and the radius of curvature R1 of the first bent portion 65a is the radius of curvature of the second bent portion 65b. It is larger than R2, for example, approximately 4 times.

  In Example 2, the ratio of the distance B in the height direction between the front window joint portion 9S and the first bending point P65a to the distance A in the height direction between the front window joint portion 9S and the second bending point P65b. B / A is also set to 0.36 as in the first embodiment.

  Also in the above-described embodiment of the second embodiment, the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b satisfy R2 <R1 (see FIG. 5). Similarly, in the cowl panel structure in which the dash panel 5 is attached to the front side of the vehicle, it is possible to improve the NVH performance while ensuring the pedestrian protection performance.

FIG. 6 is a cross-sectional view showing the front vehicle body structure of the vehicle 1 provided with the cowl panel 6B of the third embodiment.
In the cowl panel 6B of the third embodiment, the distance B in the height direction between the front window joining portion 9S and the first bending point P65a with respect to the distance A in the height direction between the front window joining portion 9S and the second bending point P65b. For example, the ratio B / A is set to 0.28 so as to satisfy 0.3 or less.
Thereby, compared with Example 1, Example 3 becomes high in the position of the 1st bending point P65a (refer distance D in Drawing 5 ).

  The relationship between the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b is the same as in Example 1, and the radius of curvature R1 of the first bent portion 65a is the radius of curvature of the second bent portion 65b. It is larger than R2, for example, approximately 4 times.

Further, in the cowl panel 6B of the third embodiment, as in the first embodiment, the vehicle front-rear direction positions of the first bending point P65a and the second bending point P65b are more forward than the front window joining portion 9S in the vehicle side view. And the second bending point P65b is positioned in front of the vehicle with respect to the first bending point P65a in a side view of the vehicle.
That is, the angle formed between the second vertical surface portion 64 b and the lower surface portion 63 is an obtuse angle, and the second vertical surface portion 64 b is disposed so as to be inclined with respect to the lower surface portion 63 in the front-rear and rear height.

  According to the aspect of Example 3 of the present invention, the distance in the height direction between the front window joint portion 9S and the first bent portion 65a with respect to the distance A in the height direction between the front window joint portion 9S and the second bent portion 65b. Since the ratio B / A of B satisfies 0.3 or less (see FIG. 6), the NVH performance can be further improved by enhancing the vibration relaxation function of the second bent portion 65b.

  Also in the cowl panel 6B of the third embodiment, the curvature radius R1 of the first bent portion 65a and the curvature radius R2 of the second bent portion 65b satisfy R2 <R1 as in the first embodiment (see FIG. 6), the dash panel 5 improves NVH performance (vibration suppression due to window vibration) while ensuring pedestrian protection performance in the cowl panel structure attached to the front of the vehicle, as in the first embodiment. Is possible.

  Furthermore, according to the third embodiment of the present invention, the second bent portion 65b is positioned in front of the vehicle with respect to the first bent portion 65a in a side view of the vehicle as in the first embodiment (see FIG. 6). ) The NVH performance can be further improved by increasing the vibration relaxation function of the second bent portion 65b.

FIG. 7 is a cross-sectional view showing the front vehicle body structure of the vehicle 1 provided with the cowl panel 6C of the fourth embodiment.
The relationship between the radius of curvature R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b is the same as in Example 1, and the radius of curvature R1 of the first bent portion 65a is greater than the radius of curvature R2 of the second bent portion 65b. For example, it is set to about 4 times.

Further, in the cowl panel 6C of the fourth embodiment, as in the third embodiment, the front window joint portion 9S and the first bend point P65a with respect to the distance A in the height direction between the front window joint portion 9S and the second bend point P65b. For example, it is set to 0.28 so that the ratio B / A of the distance B in the height direction satisfies 0.3 or less.
Thereby, compared with Example 1, Example 4 becomes high in the position of the 1st bending point P65a.

In the cowl panel 6C of the fourth embodiment as well, the vehicle front-rear direction positions of the first bending point P65a and the second bending point P65b are the same as or in front of the front window joint part 9S in a side view of the vehicle. Unlike the first embodiment, the second bending point P65b is positioned behind the first bending point P65a in the vehicle side view.
That is, as in the second embodiment, the angle formed by the second vertical surface portion 64b and the lower surface portion 63 is an acute angle, and the second vertical surface portion 64b is disposed so as to be inclined in a front, rear, and lower shape with respect to the lower surface portion 63. The

  According to the embodiment of the fourth embodiment of the present invention, the curvature radius R1 of the first bent portion 65a and the curvature radius R2 of the second bent portion 65b are set to satisfy R2 <R1 as in the first embodiment (see FIG. 7), the dash panel 5 improves NVH performance (vibration suppression due to window vibration) while ensuring pedestrian protection performance in the cowl panel structure attached to the front of the vehicle, as in the first embodiment. Is possible.

Further, according to the aspect of the fourth embodiment of the present invention, the front window joint portion 9S and the second distance 65A in the height direction between the front window joint portion 9S and the second bent portion 65b are the same as in the third embodiment. Since the ratio B / A of the distance B in the height direction with respect to the first bent portion 65a satisfies 0.3 or less (see FIG. 7), the NVH performance can be improved by enhancing the vibration relaxation function of the second bent portion 65b. Further improvement can be achieved.
[NVH performance evaluation test]
8, as the actual施例1-4 is a characteristic diagram of the analysis evaluated the effect of reducing the vibration level of the front window member 9 against and those of comparative examples.
The comparative example is a cowl panel 600 as shown in FIG. 12. Specifically, the curvature radius R1 of the first bent portion 65a and the radius of curvature R2 of the second bent portion 65b do not satisfy the relationship of R2 <R1. The curvature radius R2 of the second bent portion 65b is set to a value larger than the curvature radius R1 of the first bent portion 65a.

Incidentally, in the comparative example, the ratio of the distance B in the height direction between the front window joint portion 9S and the first bent portion 65a to the distance A in the height direction between the front window joint portion 9S and the second bent portion 65b. B / A is set to 0.36 that is 0.3 or more, and the second bent portion 65b is positioned in front of the first bent portion 65a in a side view of the vehicle.

  As an evaluation method of the NVH performance evaluation test, the vibration level of the front window member 9 was evaluated by exciting the front suspension mounting portion as the vibration position. In FIG. 8, the lower the vibration level of the front window member 9, the better the NVH performance.

  The NVH performance evaluation test results will be described based on the characteristic diagram shown in FIG. 8. All of Examples 1 to 4 and the comparative example satisfy the required NVH performance. In Examples 1 to 4 where the radii of curvature of the bent portion 65a and the second bent portion 65b satisfy the relationship of R2> R1, the vibration level is lower than that of the comparative example not satisfying this relationship. The NVH performance was found to be excellent.

  Further, among the first to fourth embodiments, the first and third embodiments set so that the second bent portion 65b is positioned in front of the vehicle with respect to the first bent portion 65a in a side view of the vehicle do not satisfy this. It was found that the vibration level was lower than that of Example 2 and the NVH performance was superior.

Among Examples 1 to 4, the ratio of the distance B in the height direction between the front window joint portion 9S and the first bent portion 65a to the distance A in the height direction between the front window joint portion 9S and the second bent portion 65b. It was found that those of Examples 3 and 4 in which B / A was set to satisfy 0.3 or less had a lower vibration level and superior NVH performance than those of Examples 1 and 2 that did not satisfy this condition. .
[Pedestrian protection performance evaluation test]
FIG. 9 is a characteristic diagram obtained by analyzing and evaluating the effect of reducing the head injury value indicating the pedestrian protection performance for the comparative example and the example 1.
The comparative example is a cowl panel 600 as shown in FIG.
FIG. 9 shows that the lower the head injury value, the better the pedestrian protection performance.

  The pedestrian protection performance evaluation test results will be described based on the characteristic diagram shown in FIG. 9. Both of Example 1 and the comparative example satisfy the desired pedestrian protection performance, The example in which the respective radii of curvature of the first bent part 65a and the second bent part 65b satisfy the relationship R2> R1 has a lower head injury value than the comparative example that does not satisfy this relationship. It turned out that pedestrian protection performance is excellent.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The first bent portion according to claims 2 and 3 corresponds to the first bent point P65a of the embodiment,
The second bent portion described in claims 2 and 3 corresponds to the second bent point P65b, but the present invention is not limited to the configuration of the above-described embodiment.

  For example, as shown in FIG. 10, as a cowl panel 6D of another embodiment, the cowl panel 6D is composed of two divided panels 161 and 162 having different thicknesses in a cross-sectional view perpendicular to the vehicle width direction. The divided portion 160 of the divided panels 161 and 162 is disposed in the vicinity of the second bent portion 65b in the lower surface portion 63, and the thickness (tl) of one divided panel 161 is thicker than the thickness (ts) of the other panel 162. (See the enlarged view of the region Z3 in FIG. 3).

  The one panel 161 is a panel closer to the dash panel 5 than the divided portion 160 and is a panel provided with substantially the entire lower surface portion 63. The other panel 162 is a panel closer to the front window member 9 than the dividing portion 160, and is a panel including an upper surface portion 61, a vertical surface portion 62, and a second bent portion 65b. In this embodiment, one divided panel 161 is formed with a plate thickness 1.4 times that of the other divided panel 162, for example.

  As shown in the enlarged view of the region Z3 in FIG. 3, the two divided panels 161 and 162 are formed by resin molding, and the divided portions 160 of the respective divided panels 161 and 162 are bent downward at a substantially right angle. The bent flange portions 161a and 162a are formed, and the cowl panel 6D is formed by joining the bent flange portions 161a and 162a with each other in a state of being overlapped with each other.

  According to the above configuration, the cowl panel 6D is configured by the two or more divided panels 161 and 162 in a cross-sectional view perpendicular to the vehicle width direction, and the divided portion 160 of the divided panels 161 and 162 is the second bent at the lower surface portion 63. The panel is disposed near the portion 65b, and the thickness (tl) of the panel closer to the dash panel 5 than the dividing portion 160 is made thicker than the thickness (ts) of the panel closer to the front window member 9 than the dividing portion 160 ( (See FIG. 10).

  With the above configuration, NVH performance can be exhibited by one panel 161 having a large thickness, and pedestrian protection performance can be exhibited by the other panel 162 having a small thickness.

  Further, the weight of the cowl panel can be reduced as a whole as compared with a case where the cowl panel is formed of a single panel having a large thickness. Further, it is possible to form the cowl panel having a plurality of bent portions with an excellent yield without lowering the yield at the time of molding as in the case where the thin panel having a constant thickness is formed.

  In addition, as in the present embodiment, the divided portion 160 of the divided panels 161 and 162 is disposed in the vicinity of the second bent portion 65b in the lower surface portion 63, thereby comparing with the case where the divided portion 160 is arranged in the second bent portion 65b. Thus, even in the vicinity of the second bent portion 65b, the cowl panel 6D having excellent pedestrian protection performance can be obtained because it can be formed as a part of the other thin divided panel 162.

  Further, by adopting a configuration in which the dividing portion 160 is not provided in the first bent portion 65a, when the collision load is input, the first bent portion 65a is surely deformed and energy is absorbed firmly so that walking is excellent. Person protection performance can be secured.

  In addition, as a cowl panel 6E of still another embodiment, as shown in FIG. 11A, the division part 160 of the division panels 161 and 162 is not limited to be disposed in the vicinity of the second bent part 65 b in the lower surface part 63. Instead, it may be disposed in the second bent portion 65b.

  In this way, by arranging the dividing portion 160 of the dividing panels 161 and 162 on the second bent portion 65b or the second bent portion 65b side (rear side), the lower panel 63 is arranged in the vicinity of the second bent portion 65b. Compared to the case, the cowl panel 6E having excellent NVH performance can be obtained because it can be formed as a part of one of the thick divided panels 161 in the vicinity of the second bent portion 65b.

  In addition, when the two divided panels 161 and 162 are joined at the divided portion 160, the bent flange portions 161a and 162a are overlapped and joined by welding or the like. As the cowl panel 6F of the embodiment, for example, as shown in FIG. 11B, the two divided panels 161 and 162 are not bent without forming the bent flange portions 161a and 162a in the divided portion 160. The end surfaces 161c and 162d may be overlapped and joined by welding or the like.

  10 and 11 (a) and 11 (b) illustrate the cowl panels 6D, 6E, and 6F in which the cowl panel 6 of the first embodiment is divided as an example, but not limited to the first embodiment. Any of the cowl panels 6A, 6B, 6C of Examples 2 to 4 or other cowl panels may be divided.

  As described above, the present invention, for example, includes a cowl panel that supports a front window member, and a dash panel that partitions an engine room and a vehicle compartment and is attached to a lower portion of the cowl panel. Useful for structure.

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Engine room 4 ... Vehicle compartment 5 ... Dash panel 6, 6A, 6B, 6C, 6D, 6E, 6F ... Cowl panel 9 ... Front window member 61 ... Upper surface part 62 ... Vertical surface part 63 ... Lower surface part 64a ... 1st vertical surface part 64b ... 2nd vertical surface part 65a ... 1st bending part 65b ... 2nd bending part P65a ... 1st bending point P65b ... 2nd bending point 160 ... division | segmentation part 161,162 ... division | segmentation panel 5S ... lower surface of a cowl panel Attachment portion 9S where the dash panel is attached in the portion. Joint portion R1 where the front window member is joined in the upper surface portion. Curvature radius R2 of the first bent portion. Curvature radius A of the second bent portion. Distance B in the height direction with the second bent portion ... Distance tl in the height direction between the joint portion of the front window member and the first bent portion ... Dash panel rather than the divided portion The thickness ts ... thickness of the front window member side panel from the divided portions of the panel

Claims (4)

A cowl panel that supports the front window member;
A dash panel that partitions the engine room and the vehicle compartment and is attached to a lower portion of the cowl panel;
A front body structure of a vehicle comprising:
The cowl panel has an upper surface portion to which the front window member is joined in a cross-sectional view perpendicular to the vehicle width direction,
A vertical surface portion extending downward from the upper surface portion;
Extending from the lower end of the vertical surface portion to the front of the vehicle, and a lower surface portion to which a dash panel is attached,
The attachment part to which the dash panel in the lower surface part is attached is provided so as to be positioned in front of the vehicle with respect to the joint part to which the front window member in the upper surface part is joined,
The vertical surface portion bends forward of the vehicle formed by the first vertical surface portion on the front window member side, the second vertical surface portion on the lower surface portion side, the first vertical surface portion, and the second vertical surface portion. Having one bend,
A second bent portion is formed by the second vertical surface portion and the lower surface portion,
When the radius of curvature of the first bent portion is R1, and the radius of curvature of the second bent portion is R2,
Meet the R2 <R1,
The front body structure of a vehicle, wherein the first vertical surface portion is disposed so as to be inclined in a front-rear, rear-and-rear shape with respect to the lower surface portion . A cowl panel that supports the front window member;
A dash panel that partitions the engine room and the vehicle compartment and is attached to a lower portion of the cowl panel;
A front body structure of a vehicle comprising:
The cowl panel has an upper surface portion to which the front window member is joined in a cross-sectional view perpendicular to the vehicle width direction,
A vertical surface portion extending downward from the upper surface portion;
Extending from the lower end of the vertical surface portion to the front of the vehicle, and a lower surface portion to which a dash panel is attached,
The attachment part to which the dash panel in the lower surface part is attached is provided so as to be positioned in front of the vehicle with respect to the joint part to which the front window member in the upper surface part is joined,
The vertical surface portion bends forward of the vehicle formed by the first vertical surface portion on the front window member side, the second vertical surface portion on the lower surface portion side, the first vertical surface portion, and the second vertical surface portion. Having one bend,
A second bent portion is formed by the second vertical surface portion and the lower surface portion,
When the radius of curvature of the first bent portion is R1, and the radius of curvature of the second bent portion is R2,
R2 <R1 is satisfied,
In a cross-sectional view perpendicular to the vehicle width direction, the cowl panel is composed of two or more divided panels, and the divided portion of the divided panel is disposed in the second bent portion, or in the vicinity of the second bent portion in the lower surface portion. Place and
The thickness of the panel closer to the dash panel than the divided portion is made thicker than the thickness of the panel closer to the front window member than the divided portion.
Front body structure of the vehicle. The front body structure of a vehicle according to claim 1 , wherein the second bent portion is positioned in front of the vehicle with respect to the first bent portion in a side view of the vehicle. When the distance in the height direction between the joint portion of the front window member and the second bent portion is A, and the distance in the height direction between the joint portion of the front window member and the first bent portion is B,
B / A satisfies 0.3 or less, The vehicle body structure of the front part of the vehicle in any one of Claims 1 thru | or 3 characterized by the above-mentioned.

Images