JP4304449B2 - Front body structure of the vehicle - Google Patents

Description

This invention relates to a front body structure of a vehicle, particularly, a tunnel portion of the front frame rear floor panel, and side sill relates to a front body structure of a vehicle configured to be coupled to 3 members of the floor frame .

Conventionally, the load inputted to the front frame at the time of frontal collision, by appropriately distributed to a plurality of frame member extending in the longitudinal direction of the vehicle, that are known to improve the crashworthiness of the vehicle (for example, Patent Documents 1).

That is, as described in Patent Document 1, the front frame rear end, by configuring the three-prong to be coupled to the three members of the tunnel member, sill, and a floor frame extending in the longitudinal direction of the vehicle, the front and a collision load inputted to the front frame properly transmitted to three members at the time of collision, achieving dispersion of impact load is known that to improve the crashworthiness of the vehicle.

JP2003-63455A.

  By the way, since the collision load absorption of the front frame is generally performed by buckling deformation, it is better that the front end of the front frame is not displaced left and right and up and down as it is from the initial stage of the collision to the middle and late stage.

  In this regard, in the case of the vehicle body structure employing the so-called trifurcated frame described above, the rear end of the frame is certainly divided into three sides, so that the front end of the front frame is difficult to be displaced left and right and up and down during a frontal collision.

  However, looking at the members that receive impact loads, the side sill and floor frame are composed of completely closed cross-section member members with a sufficient cross-sectional area, whereas the member members provided in the tunnel section are In order to secure vehicle volume (for example, exhaust pipe, propeller shaft, etc.) and vehicle compartment volume, a sufficient cross-sectional area cannot be ensured, and sufficient rigidity cannot be obtained.

As described above, since only the member member of the tunnel portion does not have a sufficient cross-sectional area, even when a three-forked frame is employed, when a large collision load is input, the rear end of the front frame is relatively problems in the rigidity of the tunnel portion side, weakened compared to the side sill side, that the front end of the front frame ends up displaced (inward fall) to the vehicle body inner side, the front frame to the charge amount can not be buckled and deformed was there.

  In particular, such a problem is likely to occur in a vehicle such as an open car that can receive a collision load only with an underbody.

Therefore, the present invention is a front body structure of a vehicle that employs a so-called three-branch frame, and even when a larger load is input, the front end position of the front frame is not displaced (inwardly tilted) to the vehicle body inward side. and to provide a front body structure of a vehicle which can be buckled and deformed frames in charge amount.

A vehicle front body structure according to the present invention includes a dash panel forming a front end wall of a passenger compartment, and a floor panel extending from the lower end of the dash panel to the rear of the vehicle. a tunnel portion formed to extend in both the provision of a side sill extending in the vehicle width direction side edge of the floor panel in the vehicle longitudinal direction, is provided a floor frame to the floor panel lower surface between said tunnel portion and a side sill extending in the longitudinal direction of the vehicle , more in front of the upper Symbol dash panel extends in the longitudinal direction of the vehicle, the rear end and the above tunnel portion, a front body structure of a vehicle equipped with the side sill, and a front frame coupled to a floor frame , the tunnel portion connecting portion of the upper SL front frame rear, the load transmission increasing means for increasing the load transmitted to the upper Symbol dash panel Only,該荷heavy transmission increasing means, configured as a closed-section portion extending from the front frame rear end to the dash panel, which is constituted of the closed cross section so as to extend toward the vehicle body center side obliquely upward.
One in which the.

That is, the front frame rear tunnel part, and side sills, respectively connected to the floor frame, the front body structure of a vehicle configured as a so-called three-pronged frame, the tunnel portion connecting portion, the load transmitted to the dash panel A load transmission increasing means for increasing is provided, and the collision load transmitted to the tunnel side is increased and transmitted to the dash panel.

  According to the above configuration, since the collision load transmitted to the tunnel portion side by the load transmission increasing means is also transmitted to the dash panel, a part of the collision load on the tunnel portion side can be received by the dash panel.

  Therefore, the relatively low rigidity of the tunnel part can be increased by utilizing the rigidity of the dash panel.

  As specific embodiments of the load transmission increasing means, a configuration in which the thickness of the tunnel portion connecting portion at the rear end of the front frame is increased, or another panel material is used for the tunnel portion connecting portion at the rear end of the front frame. The structure which sticks, the structure which forms several rib extended with respect to a dash panel in the tunnel part connection part of the rear end of a front frame etc. can be considered.

Further, the upper Symbol load transmission increasing means, it der those configured as a closed-section portion extending from the front frame rear end to the dash panel, since the load transmitting means for increasing the closed-section portion, or increase the thickness The load can be transmitted to the dash panel without increasing the vehicle body weight as compared with the case where another member is provided.

  Therefore, the relatively low rigidity of the tunnel portion can be increased without increasing the vehicle body weight.

Moreover, which is constituted on the Symbol closed cross-section portion so as to extend toward the vehicle body center side obliquely upward.

That is, since the closed cross-section portion that transmits load to the dash panel is formed so as to extend obliquely upward in the vehicle center side, the following effects are obtained.

That is, the position of the load transmitted to the dash panel, since that would be set to the vehicle center side obliquely upward from the front frame position, with respect to the installation position of the side sill and the floor frame (vehicle side and the vehicle bottom), The load is transmitted just at the position facing the front frame.

Thus, the vehicle center side obliquely upward position which is the position facing the side sill and the floor frame, by the load transmitted to the dash panel becomes more uniform vertical rigidity and horizontal direction of the further front frame rear Therefore, the displacement (inward tilt) of the front end of the front frame on the inner side of the vehicle body can be suppressed more reliably, and the front frame can be reliably buckled and deformed.

The vehicle front body structure according to the present invention further includes a dash panel that forms a vehicle compartment front end wall, and a floor panel that extends rearward from the lower end of the dash panel. A tunnel portion extending in the front-rear direction is formed, a side sill extending in the vehicle front-rear direction is provided at the vehicle width direction side end of the floor panel, and a floor frame extending in the vehicle front-rear direction is provided on the lower surface of the floor panel between the tunnel portion and the side sill. And a front body structure of a vehicle including a front frame that extends in the vehicle longitudinal direction in front of the dash panel and has a rear end coupled to the tunnel portion, a side sill, and a floor frame. The tunnel connecting portion at the rear end of the front frame extends above the center of the vehicle, and the dash panel is connected to the extending portion. A bulging portion is provided as a load transmission increasing means for increasing load transmission with respect to the vertical wall above the rear end of the front frame and directly above the tunnel portion, and the bulging portion has an upper side in a side view. The vehicle is extended from the rear end side of the front frame toward the vertical wall toward the rear and upward of the vehicle, and is formed to come into contact with the vertical wall from the front of the vehicle.

In one embodiment of the invention, the tunnel reinforcing member to the rear of the upper Symbol dash panel extends in the vehicle longitudinal direction is provided, thereby forming a second closed cross-section portion between the tunnel reinforcing members and the dash panel, said 2 closed cross-section portion is obtained by setting the vehicle rear side of the upper Symbol load transmission increasing means.

According to the above configuration, the second closed cross-section formed by the tunnel reinforcing member is set on the vehicle rear side of the load transmission increasing means, so that even if load transmission to the dash panel is increased by the load transmission increasing means, Since the rigidity of the dash panel can be sufficiently secured, the load transmission increasing means can be made to function more reliably.

According to another embodiment of the present invention, which upper SL front frame is provided right and left, by the second closed cross-section portion and on the upper Symbol load transmission increasing means SL and configured so as to connect them to left and right pair of front frame It is.

According to the above configuration, by connecting between the pair of left and right front frame by the load transmitting means for increasing the upper Symbol second closed cross-section portion, it is possible to increase the frame rigidity in addition the vehicle width direction, the twist between the left and right frames Stiffness can also be increased. Therefore, the vehicle body rigidity of the entire vehicle can also be improved.

According to this invention, in the front body structure of the vehicle configured as a so-called three-branch frame, the tunnel connection portion is provided with load transmission increasing means for increasing load transmission with respect to the dash panel, the load transmission increasing means, Constructed as a closed section extending from the rear end of the front frame to the dash panel. The closed section is configured to extend diagonally upward toward the center of the vehicle , increasing the collision load transmitted to the tunnel section. Having adopted the configuration in which to transmit, can receive a portion of an impact load of the tunnel portion side dash panel, the rigidity of the relatively low tunnel portion side, increasing by utilizing the rigidity of the dash panel Can do.

Thus, the front body structure of a vehicle employing a three-pronged frame, even if a more large load is inputted, the front end position of the front frame (inward fall) displaced to the vehicle body inner side without the front frame to the charge amount There is an effect that can be buckled and deformed.
Further, since the load transmission increasing means is configured as the above-mentioned closed cross section, it is possible to transmit the load to the dash panel without incurring an increase in the weight of the vehicle body. Since it is configured to extend toward the front, the vertical and lateral rigidity of the rear end of the front frame becomes uniform, and there is an effect that the displacement (inward tilt) of the front end of the front frame on the inner side of the vehicle body can be further reliably suppressed. .

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic plan view of a lower vehicle body structure of a vehicle employing the front vehicle body structure of the present invention.

  The vehicle of the present embodiment is a so-called open car having an open body at the upper part of the passenger compartment, and is configured to absorb a collision load with a lower vehicle body that is an underbody.

That is, as a specific vehicle body structure, as shown in FIG. 1, a pair of left and right front side frames 11, 11 is provided on the front side of the vehicle, and the pair of left and right front side frames 11, 11 includes an intermediate portion and a front portion. Is configured as a vehicle body rigid member extending in the front-rear direction of the vehicle, and at the rear end portion of the front side frame 11, a main portion 11a extending in the front-rear direction and an inwardly wide portion 11b extending in the vehicle width direction. And the wide portion 11c on the outer side in the vehicle width direction are integrally or integrally formed, and further, the inner wide portion 11b extends rearward along the vehicle outer surface of the tunnel portion 18 (see FIG. 2). 11d is integrally formed.

In addition, the extension of the main portion 11a of the pair of left and right front side frames 11, 11, and extends integrally respective floor frame portion 12 and the rear side frame 13 toward the rear. Here, the floor frame portion 12 of the upper predicate is a vehicle body rigidity member extending in the longitudinal direction is joined to the lower outer face to form a closed cross section of the floor panel 17 (see FIG. 2), the front side frame 11 The main portion 11a is connected to the floor frame portion 12.

Between the front cross of the front side frames 11, 11 of the upper predicate as shown in FIG. 1, while providing a front cross member (so-called No.1 cross member) 14 extending in the vehicle width direction, the dash panel 31 (FIG. 2 3), a torque box 15 extending in the vehicle width direction is provided outside the rear end portion of the front side frame 11 so as to correspond to the lower portion of the front side frame 11 , and a floor frame portion is provided at the outer end portion of the torque box 15. A side sill 16 extending in the front-rear direction of the vehicle is attached substantially parallel to the vehicle 12.

As shown in FIG. 1, the wide portion 11c of the outside of the front side frame 11 of the upper predicate extends in the vehicle width direction along the front outer face of the dash panel 31 will be described later, the torque box its vehicle width direction sides 15 and the side sill 16. Here, torque box 15 of the above mentioned are the vehicle body rigidity members extending in the vehicle width direction so as to connect the floor frame portion 12 and the side sill 16.

  On the other hand, the inner wide portion 11b of the front side frame 11 also extends in the vehicle width direction along the front vehicle outer surface of the dash panel 31 described later, and the center portion in the vehicle width direction is joined to the tunnel portion 18 side.

Moreover, the wide portion 11b on extending rearward from the predicate of each extension portion 11d, 11d is joined to the cross-hat top two corners of the lower surface vehicles outside of the tunnel portion 18 of the (cross-sectional gate shape) (corner portion) of the pair A closed cross section is formed.

Tunnel portion 18 of the upper predicate is protruded a substantially central portion of the floor panel 17 upwardly is formed so as to extend in the longitudinal direction of the vehicle, the vehicle interior side upper surface of the tunnel portion 18 substantially over the entire length of the tunnel portion 18 A tunnel member 19 (so-called high-mount backbone frame) is attached, and closed cross sections 20 and 20 (shown in FIGS. 2 and 5) extending in the vehicle front-rear direction are formed between the tunnel portion 18 and the tunnel member 19. Therefore, the body rigidity is improved. Wherein the tunnel member 19 is intended to extend in the longitudinal direction along the tunnel portion 18.

Moreover, this in front of the tunnel member 19, has established the tunnel reinforcement 21 which connects extending the passenger compartment side and the tunnel member 19 the front end of the dash panel 31 in the vehicle longitudinal direction. By this tunnel reinforcement 21, the collision load at the time of the frontal collision can be transmitted to the tunnel member 19.

  As shown in FIG. 1, the rear end portion of the tunnel member 19 and the rear side frames 13 and 13 are connected by a rear connection frame 22, and the rear portion of the side sill 16 and the tunnel portion 18 are connected. They are connected by a rear cross member 23 extending in the vehicle width direction.

Next, the detailed structure of the front body structure of the vehicle will be described in detail with reference to FIGS. 2 is a plan view of the main part showing the front body structure, FIG. 3 is a front view of the front body structure, FIG. 4 is a detailed perspective view of the rear end of the front side frame 11 , and FIG. FIG. 6 is a cross-sectional view taken along line AA in FIG.

First, the dash panel 31 that forms the vehicle interior front wall, in the vehicle width direction, and extends in the vertical direction, the vehicle width direction center, and recessed upwardly to accommodate the lower tunnel portion 18 of the upper above, Further, a concave portion 31a that is recessed toward the rear side of the vehicle is formed on the upper portion. A dash cross member 32 extending in the vehicle width direction is joined to the side surface of the dash panel 31 on the passenger compartment side. The dash cross member 32 constitutes a closed cross section between the dash panel 31, as well as joined at a height substantially equal to the front frame 11 the rear end of the upper above, the tunnel portion 18 at both ends, torque box 15 It is joined to the side sill 16 (not shown in FIG. 2 to FIG. 6).

A floor panel 17 extending in the vehicle width direction and in the front-rear direction is joined to the lower end of the dash panel 31. The floor panel 17, and forms a tunnel portion 18 extending in the longitudinal direction in the vehicle width direction center as above mentioned. In the front portion of the tunnel portion 18, for accommodating a portion of the power unit of the engine transmission, etc. therein (vehicle exterior side) is set larger the amount of projection of the upper and the vehicle width direction.

Further, this on top of the tunnel portion 18, joins the tunnel member 19 and the tunnel reinforcement 21 above mentioned so as to extend in the front-rear direction. The joint flange 21a of these tunnel reinforcement 21 is the front end, it joined from further behind the joint portion 32a of the tunnel portion 18 side of the upper mentioned dash cross member 32 to the dash panel 31 side, the tunnel reinforcement 21 The left and right dash cross members 32 are connected to each other at the front end.

  Note that an insertion hole 19a is formed in the center of the tunnel member 19 so as to insert a shift lever extending from the transmission (see FIG. 5).

Further, on the lower surface of the floor panel 17, while the floor frame portion 12 of the upper mentioned are joined so as to extend in the longitudinal direction in the left-right pair on the upper surface of the floor panel 17, the vehicle width direction tunnel portion 18 and the side sill 16 floor member 33 (see FIG. 5) are bonded to each other in a left-right pair of extending the Activity connected to.

Then, the vehicle front side of the dash panel 31, the front side frame 11 of the pair of left and right upper predicates are arranged so as to extend in the longitudinal direction. The rear end of the front side frame 11 as above mentioned, the main portion 11a to the floor frame portion 12, the torque box 15 and the side sill 16 to the wide portion 11c of the outside in the vehicle width direction, the vehicle width direction inner side of the wide portion 11b and the extension portion 11d of the tunnel portion 18, and a so-called three-pronged structure in place by bonding respectively (see FIG. 2).

That is, as shown in FIGS. 3 and 4, the rear end of the front side frame 11, the side wall of the main portion frame member 111, outside in the vehicle width direction of the wide portion 11c which constitutes the main portion 11a of the front side frame 11 outer side member plates 112 constituting a inner side member plates 113 constituting the side wall of the vehicle width direction inner side of the wide portion 11b, and front side located above these members members 111, 112, 113 The upper plate member 114 includes four members that constitute the upper wall of the rear end of the frame.

The four members 111 , 112 , 113 , 114 are joined to the front surface of the dash panel 31 by the respective joining flanges 111a to 114a, and form a closed cross section with the dash panel at the respective bulging portions 111b to 113b. The frame section of the rear end of the front side frame 11 is configured. The four members 111, 112, 113, and 114 are joined to each other by joint flanges 111 c to 114 c between them, and constitute the rear end of the front side frame 11 as a unit.

  In addition, a reinforcing member 115 is joined in front of the joining position between the main member member 111 and the floor frame portion 12 to increase the joining strength between the main member member 111 and the floor frame portion 12.

Here, the above mentioned of the inner side frame member 113 is provided with a closed cross-section portion 34 to increase the load transmitted to the further dash panel 31 above the recess 31a. That is, the inward member member 113 is greatly extended above the center of the vehicle (see FIG. 3), and a bulging portion 113d extending obliquely upward in the center of the vehicle is formed in the extended portion. A closed cross section 34 is formed between 113 d and the dash panel 31.

This closed-section portion 34, by the front end is formed so as to rise smoothly from the end side plane of the front side frame 11 is formed to be perpendicular to the rear end to the vertical wall of the dash panel 31 above the recess 31a The collision load from the front of the front side frame 11 is reliably transmitted to the recess 31a above the dash panel 31 (see FIG. 4).

Thus, the collision load is increased and transmitted to the dash panel 31, so that the collision load that the inner side member member 113 handles is positively transmitted to the dash panel 31 other than the tunnel portion 18, and the tunnel portion. The collision load transmitted to 18 is reduced.

On the rear side of the dash panel 31 of the closed section 34, a second closed section 35 configured between the tunnel reinforcement 21 and the dash panel 31 is set as shown in FIG. The second closed cross-section portion 35 that is positioned behind the closed-section portion 34 of the upper above, can receive the collision load both increased by the closed-section portion 34 to increase the rigidity of the recessed portion 31a of the dash panel 31 appropriately .

  The second closed cross-section portion 35 is positioned above the tunnel portion 18 and is set to connect the pair of left and right closed cross-section portions 34. That is, the pair of left and right front side frames 11 are configured to be connected by the pair of left and right closed cross-section portions 34 and the second closed cross-section portion 35. By connecting the left and right front side frames 11 in this way, the frame rigidity in the vehicle width direction can be increased, and the torsional rigidity between the left and right frames can also be increased.

Further, a third closed cross-section portion 36 formed between the dash panel 31 and the dash cross member 32 is set between the closed cross-section portion 34 and the second closed cross-section portion 35 as shown in FIG. Yes. Since the third closed cross-section portion 36 extends in the vehicle width direction and restricts the position of the dash panel 31 in the vehicle width direction, the rigidity of the concave portion 31a of the dash panel 31 can be further increased.

Incidentally, 37 shown in FIG. 2 is a hinge pillar to secure the front door hinges or the like.

Next, the operation and effect of the front body structure of the vehicle of the present embodiment configured as described above will be described in detail.

As described above, the front vehicle body structure of the present embodiment includes the dash panel 31 constituting the front end wall of the vehicle compartment, and the floor panel 17 extending from the lower end of the dash panel 31 to the rear of the vehicle. forming a tunnel portion 18 extending in the longitudinal direction of the vehicle in the direction center, both providing a side sill 16 extending in the longitudinal direction of the vehicle in the vehicle width direction end of the floor panel 17, floor panel between said tunnel portion 18 and the side sill 16 17 the floor frame 12 extending in the longitudinal direction of the vehicle on the lower surface is provided, further to the front of the upper Symbol dash panel 31 extends in the longitudinal direction of the vehicle, the rear end is connected to the tunnel portion 18, the side sill 16 and the floor frame portion 12 in the front body structure of a vehicle equipped with a front side frame 11 is, the tunnel portion of the upper SL front side frame 11 the rear end 1 The connecting portion, is provided with a closed cross-section portion 34 to increase the load transmission to the upper Symbol dash panel 31.

That is, connecting respectively the front side frame 11 rear tunnel part 18, the side sill 16 and the floor frame portion 12, the front body structure of a vehicle configured as a so-called three-pronged frame, tunnel portion 18 connecting portion serving as the inner side The member member 113 is provided with a closed cross-section portion 34 that increases load transmission to the dash panel 31, and the collision load transmitted to the tunnel portion 18 side is also increased and transmitted to the dash panel 31.

  According to the above configuration, since the collision load transmitted to the tunnel portion 18 side by the closed cross-section portion 34 is also transmitted to the dash panel 31, the collision load on the tunnel portion 18 side is partially received by the dash panel 31. Can do.

  Therefore, the relatively low rigidity on the tunnel portion 18 side can be increased by utilizing the rigidity of the dash panel 31.

As described above, when a relatively large load is input in the front body structure of the vehicle employing the three-branch frame by increasing the rigidity of the relatively low tunnel portion 18 side by utilizing the rigidity of the dash panel 31. But, the front end position of the front side frame 11 (inward fall) displaced to the vehicle body inner side without, the front side frame 11 to the charge amount can be buckled and deformed.

In addition to the closed cross section 34, other embodiments for increasing load transmission include a configuration in which the thickness of the tunnel connecting portion at the rear end of the front side frame 11 is increased, or the tunnel portion at the rear end of the front side frame 11. The structure which sticks another panel material to a connection part, and the structure which forms several rib extended with respect to the dash panel 31 in the tunnel part connection part of the rear end of the front side frame 11 etc. can be considered.

  Further, in this embodiment, the means for increasing load transmission is configured as a closed cross section 34 extending from the rear end of the front side frame 11 to the dash panel 31.

According to this configuration, since the closed cross-section portion 34 is a means for increasing load transmission, the load is transmitted to the dash panel 31 without increasing the plate thickness or increasing the vehicle body weight as compared with the case where another member is provided. be able to.

  Therefore, the relatively low rigidity on the tunnel portion 18 side can be increased without increasing the vehicle body weight.

Further, in this embodiment, which is constituted on the Symbol closed-section portion 34 to extend toward the vehicle body center side obliquely upward.

  That is, the closed cross-sectional portion 34 that transmits the load to the dash panel 31 is formed to be inclined so as to extend obliquely upward on the vehicle center side.

According to this configuration, the position where the load is transmitted to the dash panel 31 is set obliquely above the vehicle center side relative to the position of the front side frame 11, so that the installation positions of the side sill 16 and the floor frame portion 12 (vehicles) side and the vehicle lower), will transfer loads to opposite positions across just the front side frame 11.

Thus the vehicle center side obliquely upward position which is the position opposite the side sill 16 and the floor frame portion 12, by the load transmitted to the dash panel 31, more of the front side frame 11 rear vertical and in the horizontal direction more Since the rigidity becomes uniform, the displacement (inward tilt) of the front end of the front side frame 11 on the inner side of the vehicle body can be suppressed more reliably, and the front side frame 11 can be reliably buckled.

Further, in this embodiment, the tunnel reinforcement 21 to the rear of the upper Symbol dash panel 31 extends in the vehicle longitudinal direction is provided, forming a second closed cross-section portion 35 between the tunnel reinforcement 21 and the dash panel 31 while, is obtained by setting the second closed cross-section portion 35 to the vehicle rear side of the upper Symbol closed-section portion 34.

According to this configuration, the second closed cross-section portion 35 formed by the tunnel reinforcement 21 is set on the vehicle rear side of the above-described closed cross-section portion 34, so that the load is transmitted to the dash panel 31 by the closed cross-section portion 34. Even if it increases, since the rigidity of the dash panel 31 can be sufficiently secured, the closed section 34 can be functioned more reliably.

Further, in this embodiment, the upper SL front side frames 11, 11 are provided right and left, the upper Symbol closed-section portion 34 and the upper Symbol second closed cross-section portion 35, connecting the left and right pair of front frames 11, 11 It is comprised so that it may do.

According to this configuration, by connecting the pair of left and right front side frames 11, 11 by the second closed cross-section portion and on the upper Symbol closed cross-section portion 34 SL, it is possible to increase the frame rigidity in addition the vehicle width direction, The torsional rigidity between the left and right frames can also be increased. Therefore, the vehicle body rigidity of the entire vehicle can also be improved.

  In this embodiment, the open car body structure is described. However, a general closed body car body structure may be used.

Configuration of the present invention, in correspondence with the examples above mentioned,
The front frame of the present invention corresponds to the front side frames 11 and 11 of the embodiment,
Similarly,
The load transmission increasing means corresponds to the closed cross section 34,
The floor frame corresponds to the floor frame portion 12,
The tunnel reinforcement member corresponds to the tunnel reinforcement 21,
This invention is not limited only to the configuration of the embodiment above mentioned.

The schematic plan view of the lower body structure which employ | adopted this invention. The top view of the principal part which shows a front vehicle body structure. The front view of a front body structure. The detailed perspective view of the rear end of a front side frame. The detailed perspective view of the vehicle interior side of the front body structure. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3.

11. Front side frame (front frame)
12 ... Floor frame (floor frame)
16 ... Side sill 18 ... Tunnel 31 ... Dash panel 34 ... Closed section (load transmission increasing means)
113d ... bulge part (bulge part)

Claims (4)

A dash panel constituting the front end wall of the passenger compartment,
A floor panel extending rearward from the lower end of the dash panel,
A tunnel portion extending in the vehicle front-rear direction is formed at the center of the floor panel in the vehicle width direction,
Both The provision of side sills extending in the longitudinal direction of the vehicle in the vehicle width direction side edge of the floor panel,
A floor frame extending in the vehicle front-rear direction is provided on the lower surface of the floor panel between the tunnel portion and the side sill,
Further extending in the longitudinal direction of the vehicle in front of the upper Symbol dash panel, the rear end and the above tunnel portion, a front body structure of a vehicle equipped with the side sill, and a front frame coupled to the floor frame,
The tunnel portion connecting portion of the upper SL front frame rear, providing a load transmission increasing means for increasing the load transmitted to the upper Symbol dash panel,
The load transmission increasing means is configured as a closed cross section extending from the rear end of the front frame to the dash panel,
The front vehicle body structure of a vehicle, wherein the closed cross section is configured to extend obliquely upward toward the vehicle center side . A dash panel constituting the front end wall of the passenger compartment,
A floor panel extending rearward from the lower end of the dash panel,
A tunnel portion extending in the vehicle front-rear direction is formed at the center of the floor panel in the vehicle width direction,
While providing a side sill extending in the vehicle longitudinal direction at the vehicle width direction side end of the floor panel,
A floor frame extending in the vehicle front-rear direction is provided on the lower surface of the floor panel between the tunnel portion and the side sill,
Further, the front body structure of the vehicle includes a front frame that extends in front of the dash panel in the vehicle front-rear direction and has a rear frame coupled to the tunnel portion, the side sill, and the floor frame.
A tunnel connecting portion at the rear end of the front frame extends above the center of the vehicle, and a vertical wall above the rear end of the front frame of the dash panel and directly above the tunnel portion extends to the extended portion. On the other hand, a bulging part is provided as a load transmission increasing means for increasing the load transmission,
The bulge portion is formed so that its upper side extends from the rear end side of the front frame toward the vertical wall toward the rear and upward of the vehicle in a side view, and comes into contact with the vertical wall from the front of the vehicle. Characterized by
Front body structure of the vehicle . A tunnel reinforcing member extending in the vehicle front-rear direction is provided behind the dash panel, a second closed cross section is formed between the tunnel reinforcing member and the dash panel, and the second closed cross section is used as the load transmission increasing means. The vehicle front body structure according to claim 1 or 2 , which is set on the vehicle rear side . The front part of a vehicle according to claim 3, wherein the front frame is provided in a pair of left and right, and is configured to connect the pair of left and right front frames by the load transmission increasing means and the second closed cross section. the vehicle body structure.

Images