JP6048184B2 - Front body structure of the vehicle - Google Patents

Description

  The present invention supports a front window member from below, is joined to the front window member, a bulging portion that bulges forward in the vehicle, a vertical wall portion that extends downward from the bulging portion, and the vertical wall The present invention relates to a front body structure of a vehicle including a cowl panel (so-called S-shaped cowl) having a lower surface portion extending from the lower end of the portion toward the front of the vehicle.

In general, an open cowl structure is known as a cowl box structure including a cowl panel of a vehicle.
When the above-described open cowl structure is adopted, a front window member (open window formed by the dash upper panel on the upper side of the dash lower panel and the cowl panel is oscillated and joined to the cowl panel by means of adhesion or the like ( Front windshield) panel vibration will increase, and it will be a humming sound (sounds that squeeze the ears for a 20-300 Hz band feeling), which will cause discomfort to the passengers in the passenger compartment, which will adversely affect riding comfort. There was a problem to give.
In order to improve the riding comfort performance, it is conceivable to improve the rigidity, increase the plate thickness, or provide a reinforcing member. In this case, the riding comfort performance is improved, but the weight is reduced. There was a big difficulty.
Therefore, it is required to improve riding comfort performance without causing an increase in weight.

By the way, in Patent Document 1, a support bracket is provided as a reinforcing member for supporting a vehicle width direction intermediate portion of a cowl panel extending in the vehicle width direction of a vehicle to a corresponding portion of the dash upper panel. A device that suppresses vibration of the cowl panel while suppressing swing deformation of the panel is disclosed.
According to Patent Document 1, it is possible to reduce the vibration to some extent by increasing the rigidity of the cowl panel with the reinforcing member (support bracket), but the weight is large because the reinforcing member (support bracket) is provided. Moreover, the performance of the conventional structure disclosed in Patent Document 1 is still insufficient.

JP 2011-37288 A

  Therefore, an object of the present invention is to provide a vehicle front body structure that can reduce panel vibration of a front window member with a light and simple structure.

The vehicle front body structure according to the present invention supports a front window member from below, is joined to the front window member, and has a bulging portion that bulges forward of the vehicle, and a vertical portion that extends downward from the bulging portion. A vehicle front body structure having a cowl panel having a wall portion and a lower surface portion extending from the lower end of the vertical wall portion to the front of the vehicle, the bulging portion and the vertical wall portion or the lower surface portion. At least one reinforcing body, and the reinforcing body includes two or more reinforcing portions and a overlapping portion between the reinforcing portions, and the reinforcing portion is interposed at least at a part of the overlapping portion via a vibration damping member. It has been combined.
As the above-described vibration damping member, a viscoelastic member having a storage elastic modulus of 500 MPa or less and a loss coefficient of 0.2 or more under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz. Can be used.

According to the above configuration, since the bulging portion and the vertical wall portion of the cowl panel are connected by at least one reinforcing body, or the bulging portion and the lower surface portion of the cowl panel are connected, the rigidity of the cowl panel is secured. The swinging of the cowl panel can be suppressed.
In addition, since the reinforcing member is provided with two or more reinforcing portions and a superposed portion between the reinforcing portions without increasing the thickness of the reinforcing body, and a vibration damping member is interposed in at least a part of the superposed portion, this vibration damping By the member, the panel vibration of the front window member can be effectively reduced.
In addition, since a so-called S-shaped cowl having a bulging part, a vertical wall part, and a lower surface part is used as the cowl panel, the rear part of the cowl panel can be secured wide by the bulging part, so that the degree of freedom in interior design is increased While improving, the front bulging structure of the bulging part can secure the support rigidity of the front window member. When a collision load is input, the bulging part deforms and absorbs energy in the first stage (initial stage of deformation). In the subsequent second stage (deformation late stage), the vertical wall portion falls backward and downward to absorb energy, thereby ensuring pedestrian protection performance.

  In one embodiment of the present invention, the reinforcing body is coupled to the bulging portion and extends to the vertical wall portion or the lower surface portion, and is coupled to the vertical wall portion or the lower surface portion. A second reinforcing portion extending in the direction of the bulging portion, wherein the first reinforcing portion and the second reinforcing portion have overlapping portions, and the first reinforcing portion and the second reinforcing portion are overlapped with each other. At least a part of the parts are coupled via a vibration damping member.

  According to the above configuration, since the reinforcing body includes the first reinforcing portion and the second reinforcing portion, the reinforcing body can be configured with the minimum necessary reinforcing portion, and the number of parts and the number of assembling steps can be reduced. The panel vibration of the front window member can be reduced with a light and simple structure.

In the vehicle front body structure according to the present invention, the front window member is supported from below, the front window member is joined, and a bulging portion that bulges forward of the vehicle, and downward from the bulging portion. A vehicle front body structure including a cowl panel having a vertical wall portion that extends and a lower surface portion that extends forward from the lower end of the vertical wall portion, the bulge portion, and the vertical wall portion or the lower surface. At least one reinforcing body that connects to a portion, and the reinforcing body includes two or more reinforcing portions and a overlapping portion between the reinforcing portions, and the reinforcing portion includes a vibration damping member in at least a part of the overlapping portion. The uppermost reinforcing portion of the reinforcing portions is formed by bending at least a part of the bulging portion toward the vertical wall portion or the lower surface portion.

  According to the above configuration, the reinforcing part at the top of the vehicle is integrally formed with the bulging part of the cowl panel, and the front part is reduced by the vibration damping member interposed in the overlapping part while reducing the number of parts and the number of assembly steps. Panel vibration of the window member can be reduced.

In one embodiment of the present invention, the reinforcing body includes a first reinforcing portion formed by bending at least a part of a rear end portion of the bulging portion in a rear surface direction of the vertical wall portion, and the vertical wall portion. A second reinforcing portion coupled to the rear surface and extending in the direction of the bulging portion, wherein the first reinforcing portion and the second reinforcing portion have overlapping portions, and the first reinforcing portion and the second reinforcing portion Are coupled via a vibration damping member in at least a part of the overlapping portion.

  According to the above configuration, since the reinforcing body includes the first reinforcing portion integral with the bulging portion and the second reinforcing portion separately, the reinforcing body can be configured with the minimum necessary reinforcing portion. The panel vibration of the front window member can be reduced with a light and simple structure while further reducing the number of parts and the number of assembling steps.

  In one embodiment of the present invention, the reinforcing body is disposed at least at a portion between the left and right ends of the cowl panel in the vehicle width direction and the central portion.

  According to the above configuration, the portion between the left and right end portions and the center portion in the vehicle width direction corresponds to the vicinity of the so-called vibration antinode where the amplitude level of the secondary vibration mode is large, and is thus interposed in the overlapping portion. The vibration damping member can effectively reduce the panel vibration of the front window member.

  In one embodiment of the present invention, the reinforcing body is disposed at least at a substantially central portion of the cowl panel in the vehicle width direction.

  According to the above configuration, the substantially central portion of the cowl panel in the vehicle width direction corresponds to the vicinity of the so-called vibration antinode where the amplitude level of the primary vibration mode becomes large. Panel vibration can be reduced.

  In one embodiment of the present invention, the first reinforcing portion is coupled to the rear surface of the bulging portion, and the second reinforcing portion is coupled to the rear surface of the vertical wall portion.

  According to the above configuration, the vibration damping member is more effective due to the simple structure in which the first reinforcing portion is coupled to the rear surface of the bulging portion and the second reinforcing portion is coupled to the rear surface of the vertical wall portion. Panel vibration of the front window member can be reduced.

  In one embodiment of this invention, the reinforcement part located in the uppermost part among said 2 or more reinforcement parts is couple | bonded under the junction part of a front window member.

  According to the above configuration, since the reinforcing portion located at the uppermost portion is coupled to the lower portion of the joint portion of the front window member, the support rigidity of the front window member is further increased, thereby further effectively increasing the front window with the vibration damping member. The panel vibration of the member can be reduced.

  In one embodiment of the present invention, the reinforcing body is provided on the front side of the cowl panel, and an upper end portion of the dash panel is coupled to a lower portion of the lower surface portion of the cowl panel. The reinforcement part located in the lowest part among the above reinforcement parts is couple | bonded with the said lower surface part.

  According to the above configuration, since the lowermost reinforcing portion is coupled to the lower surface portion of the cowl panel in the vicinity of the upper end portion of the dash panel, the supporting force of the dash panel can be effectively used, and thus the front window member Panel vibration can be further suppressed.

  According to this invention, it is provided with at least one reinforcing body that connects the bulging portion of the cowl panel and the vertical wall portion or the lower surface portion, and the reinforcing body includes two or more reinforcing portions and the overlapping portion between the reinforcing portions. The reinforcing portion is coupled to at least a part of the overlapping portion via a vibration damping member, so that the front portion is effectively reduced by the vibration damping member while having a light and simple structure. There is an effect that the panel vibration of the window member can be reduced.

The perspective view which shows the front vehicle body structure of the vehicle of this invention The principal part expanded sectional view which follows the AA line of FIG. Side view showing another embodiment of vehicle front body structure Side view showing still another embodiment of the front body structure of the vehicle The perspective view which shows other Example of the front part vehicle body structure of a vehicle The principal part perspective view which shows the further another Example of the front part vehicle body structure of a vehicle BB sectional view of FIG. The principal part perspective view which shows the further another Example of the front part vehicle body structure of a vehicle Explanatory drawing which shows the primary vibration mode of a front window member Explanatory drawing which shows the secondary vibration mode of a front window member Characteristic diagram showing the difference in vibration level reduction effect between the product of this example and the comparative product

  With a lightweight and simple structure, the front window member is supported from below for the purpose of reducing panel vibration of the front window member, the front window member is joined, and a bulging portion that bulges forward in the vehicle, In the vehicle front body structure including a cowl panel having a vertical wall portion extending downward from the bulge portion and a lower surface portion extending forward from the lower end of the vertical wall portion, the bulge portion and the vertical wall portion are provided. At least one reinforcing body connecting the wall portion or the lower surface portion, wherein the reinforcing body includes two or more reinforcing portions and an overlapping portion between the reinforcing portions, and the reinforcing portion is at least a part of the overlapping portion. This is realized by a configuration in which the two are coupled via a vibration damping member.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the front body structure of the vehicle, FIG. 1 is a perspective view showing the front body structure, and a front view from the inside of the vehicle interior, and FIG. 2 is a cross-sectional view taken along line AA in FIG. .
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 drawings), and the dash lower panel 2 is connected to the engine room 3. The rear compartment 4 is partitioned in the front-rear direction.
The front pillar 5 is joined and fixed to the upper portion of the above-described hinge pillar 1 so that the front portion is low and the rear portion is high.
Furthermore, the floor panel 6 is bonded and fixed to the lower rear end portion 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 protrudes into the passenger compartment 4 at the center in the vehicle width direction, and A tunnel portion 7 extending in the front-rear direction is integrally or integrally formed.
A tunnel member 8 as a strength member for improving the floor rigidity and the vehicle body rigidity is attached to the upper portion of the tunnel portion 7 described above.

  On the other hand, a pair of left and right side sills 9, 9 (only the side sill on the right side of the vehicle is shown in the drawings) having a closed cross-sectional structure extending in the vehicle front-rear direction from the lower part of the hinge pillar 1 is provided. A floor cross member 10, 10 having a cross-sectional hat shape extending in the vehicle width direction is stretched between the side sills 9, 9, and the vehicle width between the floor cross member 10 and the floor panel 6 is extended. A closed section extending in the direction is formed.

In addition, floor frames 11 and 11 having a hat-shaped cross section are joined and fixed to an intermediate portion of the tunnel portion 7 and the side sill 9 in the vehicle width direction so as to cover both the floor panel 6 and the lower portion of the dash lower panel 2. A closed cross section extending in the front-rear direction is formed between the frame 11 and each of the panels 2 and 6 so as to improve the lower vehicle body rigidity.
Further, between the left and right hinge pillars 1, 1, instrument panel members 13 that extend in the vehicle width direction are horizontally mounted at both ends via brackets 12, 12. The instrument panel member 13 is formed of a metal pipe member, and the outer diameter of the driver's seat side is formed to be larger with respect to the outer diameter of the front passenger seat, the driver's seat side of the instrument panel member 13 in is to support the steering shaft 14 via a plurality of brackets, it is attached to the steering wheel 15 to the steering shaft 14.

In the illustrated embodiment, a left-hand drive vehicle is illustrated, so the left side is the driver seat and the right side is the passenger seat.
In FIG. 1, 16 is an air conditioning unit disposed in the center in the vehicle width direction immediately after the dash lower panel 2, and 17 is a blower unit disposed on the passenger seat side immediately after the dash lower panel 2.
As shown in FIGS. 1 and 2, a dash cross member 18 having a cross-sectional hat shape extending in the vehicle width direction is joined and fixed to the upper compartment side of the above-described dash lower panel 2 so that the dash lower panel 2 and the dash cross member are fixed. A dash cross closed cross-section 19 extending in the vehicle width direction is formed between the two and 18 so as to improve the dash panel rigidity.

As shown in FIG. 2, a cowl panel 22 that supports a front window member 21 (so-called front window glass) through a window rubber 20 from below is provided over substantially the entire width in the vehicle width direction.
The cowl panel 22 has a length in the vehicle width direction substantially equal to the length in the vehicle width direction at the inclined lower portion of the front window member 21, and the cowl panel 22 is connected to the front window member 21 via the window rubber 20. The bulging portion 22A is substantially C-shaped in a side view and bulges forward in a circular arc shape in front of the vehicle, and the lower portion of the bulging portion 22A is provided with a corner portion 22R below the bulging portion 22A. And a vertical wall portion 22B extending downward from the corner portion 22R and a lower surface portion 22C extending in a substantially horizontal direction from the lower end of the vertical wall portion 22B to the front of the vehicle. It is configured.
By adopting the so-called S-shaped cowl having the bulging portion 22A, the vertical wall portion 22B, and the lower surface portion 22C as the cowl panel 22, a wide space behind the cowl panel 22 can be secured by the bulging portion 22A. Thus, while improving the degree of freedom in interior design, the support structure of the front window member 21 can be secured by the forward projecting structure of the bulging portion 22A, and when the collision load is input, the first stage (initial deformation) The bulging portion 22A is deformed and absorbs energy, and the vertical wall portion 22B falls backward and downward in the second stage (later deformation) to absorb energy, thereby ensuring pedestrian protection performance. It is configured accordingly.

As shown in FIG. 2, a cowl front panel 23 is provided at the front end of the lower surface portion 22C of the above-described cowl panel 22 so that the rear end 23a is joined and extends forward, and the front vertical wall portion 23b of the cowl front panel 23 is provided. A cowl cross member 25 is attached to the upper side of the front portion of the cowl front panel 23 so as to form a closed cross section 24 extending in the vehicle width direction.
The above-described cowl panel 22, the cowl front panel 23, and the cowl cross member 25 form a cowl box 26 having a so-called open cowl structure that extends in the vehicle width direction.
Here, the upper end bent piece 2 a of the dash lower panel 2 is joined and fixed to the lower surface of the lower surface portion 22 </ b> C of the cowl panel 22.

In FIG. 1, 22D is an opening for introducing outside air provided on the passenger seat side of the cowl panel 22, and in FIG. 2, 27 is a hood that covers the top of the engine room 3 so that it can be opened and closed. The bonnet outer panel 28 and the bonnet inner panel 29 are configured.
In the figure, arrow F indicates the front of the vehicle.

  As shown in FIGS. 1 and 2, at least one reinforcing body 30 is provided in the vehicle width direction connecting the bulging portion 22A and the vertical wall portion 22B of the cowl panel 22 up and down, and each of the reinforcing bodies 30 has a width. It is provided with two or more constant and strip-shaped reinforcing portions 31 and 32 and an overlapping portion 33 between the reinforcing portions 31 and 32, and the reinforcing body 30 is at least part of the overlapping portion 33 described above (this embodiment Are all connected via a vibration damping member 34.

  As shown in FIG. 1, in this embodiment, the reinforcing body 30 is provided on the side of the cabin 4 of the cowl panel 22 (so-called S-shaped cowl), and the reinforcing body 30 is at least a vehicle of the cowl panel 22. A total of two are disposed in the region between the left and right end portions in the width direction and the central portion. That is, the portion between the left and right end portions in the vehicle width direction and the center portion in the vehicle width direction is in the vicinity of so-called vibration antinodes X and Y where the amplitude level of the secondary vibration mode of the front window member 21 shown in FIG. It is equivalent to. In the secondary amplitude mode shown in FIG. 10, the left part and the right part of the front window member 21 vibrate in opposite phases. In FIG. 10, the difference in vibration level is indicated by the hatching density (sparse / dense) for convenience of illustration.

Specifically, as shown in FIG. 2, the reinforcing body 30 includes a first reinforcing portion 31 coupled to the rear surface of the bulging portion 22A of the cowl panel 22 and extending downward in the direction of the vertical wall portion 22B, and a vertical wall portion. A second reinforcing portion 32 that is coupled to the rear surface of 22B and extends upward in the direction of the bulging portion 22A. The lower portion of the first reinforcing portion 31 and the upper portion of the second reinforcing portion 32 are substantially in the front-rear direction. To form a superposition part 33 (overlapping part), and the first reinforcement part 31 and the second reinforcement part 32 vibrate in at least part of the superposition part 33 (in this embodiment, the whole superposition part 33). It is connected via a damping member 34.
The first reinforcing portion 31 has a joining piece 31a integrally formed at its upper end, and the second reinforcing portion 32 has a joining piece 32a integrally formed at its lower end. And as shown in FIG. 2, the above-mentioned joining piece 31a is couple | bonded with the rear surface of the bulging part 22A, and the above-mentioned joining piece 32a is couple | bonded with the rear surface of the vertical wall part 22B.

Furthermore, the reinforcement part located in the vehicle uppermost part, ie, the 1st reinforcement part 31, among the above-mentioned two or more reinforcement parts is couple | bonded under the junction part of the front window member 21. As shown in FIG. That is, the upper end portion of the first reinforcing portion 31 is coupled to the rear surface of the bulging portion 22A of the cowl panel 22 so as to correspond to the filling portion of the window rubber 20, thereby supporting the front window member 21. The rigidity is further increased, and the vibration damping member 34 is configured to effectively reduce the panel vibration of the front window member 21.
Here, as the above-described vibration damping member 34, the storage elastic modulus is 500 MPa or less and the loss coefficient is 0.2 or more under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz. A viscoelastic member is used.
The vibration damping member 34 has the highest vibration damping effect when a shearing direction force is applied to the vibration damping member 34. Therefore, as shown in FIG. Since the arrangement direction of the damping member 34 is as vertical as possible, a sufficient vibration damping effect can be ensured.

  As described above, the front vehicle body structure of the vehicle according to the first embodiment shown in FIGS. 1 and 2 supports the front window member 21 from below, and the front window member 21 is joined and bulges forward in the vehicle. A front portion of a vehicle including a cowl panel 22 having a bulging portion 22A, a vertical wall portion 22B extending downward from the bulging portion 22A, and a lower surface portion 22C extending forward from the lower end of the vertical wall portion 22B. The vehicle body structure includes at least one reinforcing body 30 (in this embodiment, a total of two reinforcing bodies 30, 30 in the vehicle direction) that connects the bulging portion 22A and the vertical wall portion 22B. 30 includes two or more reinforcing portions 31 and 32, and an overlapping portion 33 between the reinforcing portions 31 and 32. The reinforcing portion 30 is at least a part of the overlapping portion 33 (in this embodiment, the entire overlapping portion 33). ) Vibration damping Those linked via the timber 34 (see FIG. 2).

According to this configuration, since the bulging portion 22A and the vertical wall portion 22B of the cowl panel 22 are connected by the at least one reinforcing body 30, the swinging of the cowl panel 22 is suppressed while ensuring the rigidity of the cowl panel 22. be able to.
In addition, the reinforcing member 30 includes two or more reinforcing portions 31 and 32 and an overlapping portion 33 between the reinforcing portions 31 and 32 without increasing the thickness of the reinforcing member 30, and a vibration damping member is provided at least in a part of the overlapping portion 33. 34 is interposed, the vibration damping member 34 can effectively reduce the panel vibration of the front window member 21.
Further, since the so-called S-shaped cowl having the bulging portion 22A, the vertical wall portion 22B, and the lower surface portion 22C is used as the cowl panel 22, by ensuring a wide space behind the cowl panel 22 by the bulging portion 22A, While improving the degree of freedom in interior design, the front projecting structure of the bulging portion 22A can secure the support rigidity of the front window member 21, and when the collision load is input, the bulging portion is in the first stage (initial deformation). 22A deform | transforms and absorbs energy, and the vertical wall part 22B falls backward and below in the 2nd stage (deformation | transformation latter stage) after that, absorbs energy, and, thereby, pedestrian protection performance can be ensured.
The reinforcing body 30 is coupled to the bulging portion 22A and extends to the vertical wall portion 22B direction (specifically, the rear surface direction of the vertical wall portion 22B) and the vertical wall portion 22B. And a second reinforcing portion 32 extending in the direction of the bulging portion 22A. The first reinforcing portion 31 and the second reinforcing portion 32 have a superposed portion 33, and the first reinforcing portion 31 and the first reinforcing portion 2 The reinforcing portion 32 is coupled to at least a part of the overlapping portion 33 (the entire overlapping portion 33 in this embodiment) via a vibration damping member 34 (see FIG. 2).

According to this configuration, since the reinforcing body 30 includes the first reinforcing portion 31 and the second reinforcing portion 32, the reinforcing body 30 can be configured with the minimum necessary reinforcing portions 31, 32, and the number of parts is reduced. Further, the panel vibration of the front window member 21 can be reduced with a light and simple structure while reducing the number of assembling steps.
Further, the reinforcing body 30 is disposed at least in a portion between the left and right end portions and the center portion of the cowl panel 22 in the vehicle width direction in the vehicle width direction (see FIG. 1).

According to this configuration, the portion between the left and right end portions and the center portion in the vehicle width direction corresponds to the vicinity of so-called vibration antinodes X and Y (see FIG. 10) in which the amplitude level of the secondary vibration mode increases. Therefore, the panel vibration of the front window member 21 can be effectively reduced by the vibration damping member 34 interposed in the overlapping portion 33.
Furthermore, the first reinforcing portion 31 is coupled to the rear surface of the bulging portion 22A, and the second reinforcing portion 32 is coupled to the rear surface of the vertical wall portion 22B (see FIG. 2).

According to this configuration, the vibration damping member 34 allows the first reinforcing portion 31 to be coupled to the rear surface of the bulging portion 22A and the second reinforcing portion 32 to be coupled to the rear surface of the vertical wall portion 22B. The panel vibration of the front window member 21 can be further effectively reduced.
In addition, the reinforcing part (see the first reinforcing part 31) located at the uppermost part of the two or more reinforcing parts 31 and 32 is below the joint part of the front window member 21 (see the filling position of the window rubber 20). They are combined (see FIG. 2).

  According to this configuration, since the reinforcing portion (first reinforcing portion 31) located at the uppermost portion is coupled to the lower portion of the joint portion of the front window member 21, the support rigidity of the front window member 21 is further increased, thereby vibrating. The panel vibration of the front window member 21 can be further effectively reduced by the damping member 34.

FIG. 3 is a side view showing another embodiment of the front body structure of the vehicle. In FIG. 3, the same parts as those in the previous figure are denoted by the same reference numerals, and detailed description thereof is omitted.
In the embodiment shown in FIG. 2, the reinforcing body 30 includes two reinforcing portions 31 and 32 and one overlapping portion 33 between the reinforcing portions 31 and 32, but in the embodiment 2 shown in FIG. 3. Comprises three reinforcing portions 41, 42, 43 in which the reinforcing body 40 extends in the up-down direction, and two overlapping portions 44, 45 that overlap in the front-rear direction between the reinforcing portions 41, 42, 42, 43, The reinforcing portions 41 and 42 and the reinforcing portions 42 and 43 are coupled via the vibration damping members 46 and 46 in the overlapping portions 44 and 45 described above.
A joining piece 41a is integrally formed at the upper end of the reinforcing portion 41 located at the uppermost portion, and a joining piece 43a is integrally formed at the lower end of the reinforcing portion 43 located at the lowermost portion.
And the above-mentioned joining piece 41a is couple | bonded with the rear surface of the bulging part 22A, and the above-mentioned joining piece 43a is couple | bonded with the rear surface of the vertical wall part 22B.
Similarly to the first embodiment, the above-described vibration damping member 46 also has a storage elastic modulus of 500 MPa or less and a loss factor of 0 under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz. Use two or more viscoelastic members.

  The front vehicle body structure of the vehicle of the second embodiment shown in FIG. 3 supports a front window member 21 from below, the front window member 21 is joined, and a bulging portion 22A that bulges forward of the vehicle, A vehicle front body structure including a cowl panel 22 having a vertical wall portion 22B extending downward from the bulging portion 22A and a lower surface portion 22C extending from the lower end of the vertical wall portion 22B to the front of the vehicle, At least one reinforcing body 40 that connects the bulging portion 22A and the vertical wall portion 22B (in this embodiment, as shown in FIG. 1, a total of two reinforcing bodies 40, 40 in the vehicle width direction) is provided. The body 40 includes two or more reinforcing portions 41, 42, 43 and overlapping portions 44, 45 between the reinforcing portions 41, 42, and 42, 43, and the reinforcing portions 41, 42, 43 are connected to the overlapping portion 44. , 45 at least (this In 施例, those bonded via a vibration damping member 46 and 46 in all) of the overlapping portions 44, 45 (see FIG. 3).

  According to the said structure, without increasing the plate | board thickness of the reinforcement body 40, it equipped with two or more reinforcement parts 41,42,43 and the superposition | polymerization part 44,45 between reinforcement parts, Since the vibration damping members 46 and 46 are provided, the vibration damping members 46 and 46 can effectively reduce the panel vibration of the front window member 21.

  In the second embodiment shown in FIG. 3 as well, the other configurations, functions, and effects are the same as those in the first embodiment. Therefore, in FIG. Although the detailed description is omitted, the reinforcing portion may be four or more.

FIG. 4 is a side view showing still another embodiment of the front body structure of the vehicle.
In the first and second embodiments, the reinforcing portions 31 and 41 constituting the reinforcing bodies 30 and 40 are configured as separate members from the cowl panel 22, but in this third embodiment shown in FIG. The first reinforcing portion 31 </ b> A that constitutes is integrally formed with the cowl panel 22.
That is, as shown in FIG. 4, the first reinforcing portion 31A, which is the reinforcing portion at the top of the vehicle among the reinforcing portions 31A and 32, has at least a part of the rear end portion of the bulging portion 22A of the cowl panel 22 as a vertical wall. The portion 22B is bent in the rear surface direction (that is, obliquely rearward and downward) and integrally formed with the bulging portion 22A.
In this case, considering the planing, the longitudinal length of the first reinforcing portion 31A is set sufficiently shorter than the longitudinal length of the second reinforcing portion 32 so that the material yield of the cowl panel 22 is not deteriorated. Yes.

The second reinforcing portion 32 described above has an upper piece portion 32b that forms the overlapping portion 33. The upper piece portion 32b is formed in a slant shape having a front, a rear, and a low shape, and a rear portion of the upper piece 32b. A reinforcing portion main body 32c extending diagonally forward and downward from the end toward the rear surface of the vertical wall portion 22B of the cowl panel 22 is provided, and a joining piece 32d is continuously formed integrally with a lower end portion of the reinforcing portion main body 32c.
And the above-mentioned joining piece 32d is couple | bonded with the rear surface of the vertical wall part 22B.

  As described above, the front vehicle body structure of the vehicle according to the third embodiment shown in FIG. 4 supports the front window member 21 from below, and the front window member 21 is joined and bulged to the front of the vehicle. A vehicle front body structure including a cowl panel 22 having a portion 22A, a vertical wall portion 22B extending downward from the bulging portion 22A, and a lower surface portion 22C extending forward from the lower end of the vertical wall portion 22B. Then, at least one reinforcing body 30 connecting the bulging portion 22A and the vertical wall portion 22B (in this embodiment, a total of two reinforcing bodies 30, 30 in the vehicle width direction as shown in FIG. 1) is provided. The reinforcing body 30 includes two or more reinforcing portions 31A, 32 and a superposed portion 33 between the reinforcing portions 31A, 32, and the reinforcing portions 31A, 32 are at least part of the superposed portion 33 (this implementation). In the example, the superposition part 33 The uppermost reinforcing portion 31A of the reinforcing portions 31A, 32 is formed by bending at least a part of the bulging portion 22A in the direction of the vertical wall portion 22B. (See FIG. 4).

According to this configuration, the reinforcing portion 31A at the top of the vehicle is integrally formed with the bulging portion 22A of the cowl panel 22, and the vibration damping provided in the overlapping portion 33 while reducing the number of parts and the number of assembling steps. The panel 34 of the front window member 21 can be reduced by the member 34.
The reinforcing body 30 includes a first reinforcing portion 31A formed by bending at least a part of the rear end portion of the bulging portion 22A toward the rear surface of the vertical wall portion 22B, and the vertical wall portion 22B. A second reinforcing portion 32 coupled to the rear surface and extending in the direction of the upper rear end of the bulging portion 22A. The first reinforcing portion 31A and the second reinforcing portion 32 include an overlapping portion 33, and The first reinforcing portion 31A and the second reinforcing portion 32 are coupled via a vibration damping member 34 in at least a part of the overlapping portion 33 (in this embodiment, the entire overlapping portion) (see FIG. 4). .

  According to this configuration, since the reinforcing body 30 includes the first reinforcing portion 31A integrated with the bulging portion 22A and the second reinforcing portion 32, the reinforcing body 30 is formed with the minimum necessary reinforcing portions 31A and 32. The panel vibration of the front window member 21 can be reduced with a light and simple structure while further reducing the number of parts and the number of assembling steps.

  In the third embodiment shown in FIG. 4 as well, the other configurations, functions, and effects are almost the same as those of the previous embodiments. Therefore, in FIG. Detailed description thereof will be omitted.

FIG. 5 is a perspective view showing still another embodiment of the front body structure of the vehicle.
In each of the above-described first to third embodiments, a total of two reinforcing bodies 30 and 40 are disposed between the left and right ends of the cowl panel 22 in the vehicle width direction and the central portion. In the fourth embodiment, a total of one reinforcing body 30 described above is disposed at a substantially central portion of the cowl panel 22 in the vehicle width direction. That is, the substantially central portion of the cowl panel 22 in the vehicle width direction corresponds to the vicinity of the so-called vibration antinode Z in which the amplitude level of the primary vibration mode of the front window member 21 shown in FIG. In the primary vibration mode, the lower center of the front window member 21 vibrates greatly. Further, in FIG. 9, the difference in vibration level is shown by the hatching density (sparse / dense) for convenience of illustration.

Also in the fourth embodiment, the reinforcing body 30 is coupled to the rear surface of the bulged portion 22A of the cowl panel 22 and coupled to the first reinforcing member 31 extending in the direction of the vertical wall portion 22B and the rear surface of the vertical wall portion 22B. And the second reinforcing portion 32 extending in the direction of the bulging portion 22A described above, and the first reinforcing portion 31 and the second reinforcing portion 32 have the overlapping portion 33 overlapping in the front-rear direction, and the first reinforcing portion The lower part of the part 31 and the upper part of the second reinforcing part 32 are joined at the overlapping part 33 via a vibration damping member 34 (see the previous figure).
Further, also in Example 4, the vibration damping member 34 has a storage elastic modulus of 500 MPa or less and a loss factor of 0 under the condition that the temperature is 20 ° C. and the frequency of the excitation force is 30 Hz. 2 or more viscoelastic members are used.

As described above, in the fourth embodiment shown in FIG. 5, the reinforcing body 30 is disposed at least at a substantially central portion in the vehicle width direction of the cowl panel 22 (see FIG. 5).
According to this configuration, the substantially central portion of the cowl panel 22 in the vehicle width direction corresponds to the vicinity of the so-called vibration antinode Z (see FIG. 9) in which the amplitude level of the primary vibration mode becomes large. The panel vibration of the front window member 21 can be effectively reduced by referring to the previous figure.

6 and 7 show still another embodiment of the front body structure of a vehicle.
6 is a perspective view of the main part showing the mounting structure of the reinforcing body, and FIG. 7 is a cross-sectional view taken along line BB in FIG.
In the fifth embodiment, the reinforcing body 50 is provided on the front side of the cowl panel 22. In addition, the reinforcing body 50 includes the left and right end portions 22LE and 22RI in the vehicle width direction of the cowl panel 22 and the central portion so as to correspond to the antinodes X and Y (see FIG. 10) of the vibration in the secondary vibration mode of the front window member 21. A total of two are disposed in the region between the two.
Specifically, the reinforcing body 50 described above is coupled to the front side of the bulging portion 22A of the cowl panel 22 and extends in the direction of the lower surface portion 22C, and is coupled to the lower surface portion 22C to the front side of the bulging portion 22A. A second reinforcing portion 52 extending, and a lower portion of the first reinforcing portion 51 and an upper portion of the second reinforcing portion 52 are overlapped in the front-rear direction to form a superposed portion 53. And the second reinforcing portion 52 are joined at the overlapping portion 53 via the vibration damping member 54.

Also in the fifth embodiment, the vibration damping member 54 has a storage elastic modulus of 500 MPa or less and a loss coefficient of 0.1 at a temperature of 20 ° C. and a vibration force frequency of 30 Hz. Two or more viscoelastic members are used.
The above-mentioned first reinforcing part 51 is integrally formed with a joining piece 51a inclined at the front and rear and high at the upper end thereof, and the second reinforcing part 52 is integrally formed with a joining piece 52a extending forward of the vehicle at the lower end thereof. The joining piece 51a is coupled to the front surface of the bulging portion 22A, and the joining piece 52a is coupled to the upper surface of the lower surface portion 22C.

  As shown in FIG. 7, an upper end portion (upper end bent piece 2 a) of a dash lower panel 2 as a dash panel is coupled to a lower portion of the lower surface portion 22 </ b> C of the above-described cowl panel 22. The second reinforcing portion 52, which is the reinforcing portion located at the lowermost portion of the two or more reinforcing portions 51, 52, is coupled to the lower surface portion 22C in the vicinity of (in this embodiment, immediately above the upper end bent piece 2a). Is.

As described above, in the fifth embodiment shown in FIGS. 6 and 7, the reinforcing body 50 is provided on the front side of the cowl panel 22, and a dash panel (dash panel) is formed below the lower surface portion 22 </ b> C of the cowl panel 22. The upper bent piece 2a of the lower panel 2) is coupled, and a reinforcing portion (see the second reinforcing portion 52) located at the lowermost portion of the two or more reinforcing portions 51, 52 in the vicinity of the upper bent piece 2a. It is coupled to the lower surface portion 22C (see FIG. 7).
According to this configuration, the lowermost portion 22C of the cowl panel 22 is coupled to the lowermost reinforcing portion (second reinforcing portion 52) in the vicinity of the upper end portion of the dash panel (dash lower panel 2). The support force of the dash lower panel 2) can also be used effectively, and hence the panel vibration of the front window member 21 can be further suppressed.

  In this embodiment shown in FIGS. 6 and 7, the other configurations, operations and effects are almost the same as those in the previous embodiment. Parts are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 6, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, and arrow UP indicates the upper side of the vehicle.

FIG. 8 is a perspective view showing still another embodiment of the front body structure of the vehicle.
Also in the sixth embodiment, the reinforcing body 50 is provided on the front side of the cowl panel 22 as in the fifth embodiment. In the sixth embodiment shown in FIG. 8, the reinforcing body 50 has a substantially central portion in the vehicle width direction of the cowl panel 22 so as to correspond to the antinode Z (see FIG. 9) of the vibration in the primary vibration mode of the front window member 21. It is arranged.
The other points of the sixth embodiment are the same as those of the fifth embodiment shown in FIGS. For this reason, also in the sixth embodiment, since the support force of the dash lower panel 2 can be effectively used, the panel vibration of the front window member 21 can be further suppressed.
In FIG. 8, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
[Analysis evaluation]
FIG. 11 shows a comparative example product, Example 6 shown in FIG. 8, Example 5 shown in FIG. 6, Example 4 shown in FIG. It is the characteristic view which analyzed and evaluated the reduction effect of the vibration level of the front window member 21 with respect to the thing of Example 1 shown.
In the comparative example, all the reinforcing bodies 30 are removed from the vehicle body structure of the first embodiment, and in the sixth embodiment, as shown in FIG. 8, the front side of the cowl panel 22 is approximately at the center in the vehicle width direction. As shown in FIG. 6, the reinforcing member 50 is provided with one reinforcing body 50, as shown in FIG. 6, on the front side of the cowl panel 22, between the left and right end portions 22 LE and 22 RI in the vehicle width direction and the central portion. In the fourth embodiment, as shown in FIG. 5, one reinforcing body 30 is provided at the center of the rear side of the cowl panel 22 in the vehicle width direction. In the first embodiment, as shown in FIG. 1, a total of two reinforcing bodies 30, 30 are provided on the rear side of the cowl panel 22 between the left and right end portions in the vehicle width direction and the central portion. Is provided.

As an analysis evaluation method, the front suspension mounting portion as the vibration position was vibrated, and the panel vibration level of the front window member 21 was evaluated. FIG. 11 shows the primary vibration mode of the front window member 21 of the comparative example and Examples 6, 5, 4 and 1 when the target value is 0 (if the target value is less than zero, the target is achieved). The vibration levels of the secondary vibration mode (see the hatched graph in FIG. 11) and the secondary vibration mode are shown.
The above-described primary vibration mode is a main factor of vibration of the front window member 21 (main factor of NVH), and the secondary vibration mode is a sub-factor of vibration of the front window member 21.
As is clear from FIG. 11, it was found that the comparative example has a vibration level larger than the target value in both the primary vibration mode and the secondary vibration mode, and has no effect.

  In Examples 6, 5, 4, and 1, the vibration level was 0 or less of the target value in the primary vibration mode, which is the main cause of vibration, and it was found that the vibration level could be reduced and the target was achieved.

  In particular, the vibration level of Example 1 is both zero or less than the target value in both the primary vibration mode that is the main factor of vibration and the secondary vibration mode that is the sub-factor of vibration. It was found that the vibration level could be further reduced and the target was fully achieved.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The dash panel of the present invention corresponds to the dash lower panel 2 of the embodiment,
Similarly,
The upper end of the dash panel corresponds to the upper bent piece 2a,
The present invention is not limited to the configuration of the above-described embodiment.
For example, the first embodiment (see FIG. 1) may be combined with the sixth embodiment (see FIG. 8), or the fourth embodiment (see FIG. 5) and the fifth embodiment (see FIG. 6) may be combined. Alternatively, other combination structures may be employed.

  As described above, the present invention supports the front window member from below, is joined to the front window member, and has a bulging portion that bulges forward of the vehicle, and a vertical wall that extends downward from the bulging portion. This is useful for a front vehicle body structure of a vehicle including a cowl panel (so-called S-shaped cowl) having a portion and a lower surface portion extending forward from the lower end of the vertical wall portion.

2. Dash lower panel (dash panel)
2a: Upper end bent piece (upper end)
DESCRIPTION OF SYMBOLS 21 ... Front window member 22 ... Cowl panel 22A ... Swelling part 22B ... Vertical wall part 22C ... Lower surface part 30, 40, 50 ... Reinforcement body 31,31A, 51 ... 1st reinforcement part (reinforcement part)
32, 52 ... 2nd reinforcement part (reinforcement part)
33, 53 ... overlapping portions 34, 54 ... vibration damping members 41-43 ... reinforcing portions 44, 45 ... overlapping portions 46 ... vibration damping members

Claims (9)

A front window member is supported from below, the front window member is joined, and a bulging portion that bulges forward in the vehicle, a vertical wall portion that extends downward from the bulging portion, and a lower end of the vertical wall portion A vehicle front body structure including a cowl panel having a lower surface portion extending forward of the vehicle,
Comprising at least one reinforcing body for connecting the bulging portion and the vertical wall portion or the lower surface portion;
The reinforcing body includes two or more reinforcing portions and a superposed portion between the reinforcing portions,
The vehicle body structure of the front part of the vehicle in which the reinforcing part is coupled to at least a part of the overlapping part via a vibration damping member. The reinforcing body is coupled to the bulging portion and extends in the direction of the vertical wall portion or the lower surface portion, and a first reinforcing portion,
A second reinforcing portion coupled to the vertical wall portion or the lower surface portion and extending in the bulging portion direction,
The first reinforcing portion and the second reinforcing portion have overlapping portions,
The vehicle front body structure according to claim 1, wherein the first reinforcing portion and the second reinforcing portion are coupled to each other in at least a part of the overlapping portion via a vibration damping member. A front window member is supported from below, the front window member is joined, and a bulging portion that bulges forward in the vehicle, a vertical wall portion that extends downward from the bulging portion, and a lower end of the vertical wall portion A vehicle front body structure including a cowl panel having a lower surface portion extending forward of the vehicle,
Comprising at least one reinforcing body for connecting the bulging portion and the vertical wall portion or the lower surface portion;
The reinforcing body includes two or more reinforcing portions and a superposed portion between the reinforcing portions,
The reinforcing portion is coupled via a vibration damping member in at least a part of the overlapping portion,
The uppermost reinforcing portion of the reinforcing portion is a vehicle front body structure in which at least a part of the bulging portion is bent toward the vertical wall portion or the lower surface portion. The reinforcing body includes a first reinforcing portion formed by bending at least a part of the rear end portion of the bulging portion toward the rear surface of the vertical wall portion;
A second reinforcing portion coupled to the rear surface of the vertical wall portion and extending in the direction of the bulging portion,
The first reinforcing portion and the second reinforcing portion have overlapping portions,
The vehicle front body structure according to claim 3, wherein the first reinforcing portion and the second reinforcing portion are coupled via a vibration damping member in at least a part of the overlapping portion. The vehicle front body structure according to any one of claims 1 to 4, wherein the reinforcing body is disposed at least at a portion between the left and right end portions and the center portion of the cowl panel in the vehicle width direction. The vehicle front body structure according to any one of claims 1 to 4, wherein the reinforcing body is disposed at least at a substantially central portion of the cowl panel in the vehicle width direction. 5. The method according to claim 5, wherein the first reinforcing portion is coupled to the rear surface of the bulging portion, and the second reinforcing portion is coupled to the rear surface of the vertical wall portion. 5. The front body structure of the vehicle according to 5 . The vehicle according to any one of claims 1, 2, 5, 6, and 7, wherein a reinforcing portion positioned at an uppermost portion of the two or more reinforcing portions is coupled to a lower portion of a joint portion of the front window member. Front body structure. The reinforcing body is provided on the front side of the cowl panel,
An upper end portion of the dash panel is coupled to a lower portion of the lower surface portion of the cowl panel,
The front portion of the vehicle according to any one of claims 1, 2, 5, and 6, wherein a reinforcement portion positioned at a lowermost portion of the two or more reinforcement portions in the vicinity of the upper end portion is coupled to the lower surface portion. Body structure.

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