JP7287197B2 - Vehicle front body structure - Google Patents

Description

The present invention relates to a vehicle front body structure, and more particularly to a vehicle front body structure in which a front frame is joined across an inner portion of a floor panel and an outer portion located below the inner portion.

In a vehicle such as an automobile, a pair of left and right front frames extending in the front-rear direction is disposed in the front portion of the vehicle body in a closed cross-sectional shape. From the vertical wall portion of the panel toward the rear side, it inclines along the inclined portion that inclines downward, extends rearward along the floor panel, and extends to the bent portion between the inclined portion of the dash panel and the floor panel. It is known to have bends along it.

In a vehicle equipped with such a front frame, when a collision load acts on the front frame from the front of the vehicle during a frontal collision (frontal collision), particularly during an offset collision, the front frame buckles at the bent portion, causing the front frame to bend. There is a risk that the front part will move rearward from the part and the dash panel will move toward the passenger compartment.

On the other hand, for example, in Patent Document 1, at a bent portion of a front frame having a U-shaped cross section, first flanges extending outward from both sides of the base and extending parallel to the side surface of the base from the first flange are disclosed. A vehicle body structure reinforced by affixing a reinforcing member having a second flange is disclosed.

Japanese Utility Model Laid-Open No. 52-126517

By the way, in a vehicle such as an automobile, the vehicle width direction outer side of the floor panel may be provided lower than the vehicle width direction inner side. In such a case, when the rear side of the front frame having the bottom wall portion and the vertical wall portions on both sides is joined across the inner and outer portions of the lower surface of the floor panel, the inner vertical wall portion of the front frame is joined to the outer vertical wall portion. The length in the vertical direction is larger than that of the wall.

In a vehicle equipped with such a front frame, when a collision load acts on the front frame from the front of the vehicle in the event of a frontal collision, the inner vertical wall portion of the bent portion of the front frame may swell inward in the vehicle width direction and deform out-of-plane. There is If the inner vertical wall portion of the front frame is deformed out of plane, the front frame may buckle and the front portion may move rearward from the bent portion of the front frame, causing the dash panel to move toward the passenger compartment.

In view of the above, the present invention provides a vehicle in which a front frame is joined across an inner portion of a floor panel and an outer portion disposed below the inner portion of the floor panel. An object of the present invention is to provide a vehicle front body structure capable of suppressing the movement of a panel toward the passenger compartment.

The present invention comprises a front frame extending in the front-rear direction, a dash panel having a vertical wall section defining a front side of a passenger compartment and an inclined section inclined downward from the vertical wall section toward the rear side, and the dash panel. and a floor panel extending rearward from the inclined portion of the floor panel, the floor panel having an inner portion arranged inside in the vehicle width direction and an outer portion arranged below the inner portion and outside in the vehicle width direction. In the front vehicle body structure of a vehicle, the front frame includes a front frame extending forward from a vertical wall portion of the dash panel and an inclined portion that slopes downward toward the rear along the slope portion of the dash panel. An inclined frame and a rear frame extending rearward along the floor panel are provided. The rear frame includes a bottom wall portion and an outer portion of the floor panel extending upward from the vehicle width direction outer side of the bottom wall portion. and an inner vertical wall portion extending upward from the outer vertical wall portion from the inner side of the bottom wall portion in the vehicle width direction and joined to the inner portion of the floor panel, wherein the A reinforcing member provided along the inner vertical wall portion of the rear frame is joined to the outside in the vehicle width direction of the inner vertical wall portion of the rear frame, and the reinforcing member is located between the inclined portion of the dash panel and the dash panel in the longitudinal direction of the vehicle body. Provided is a vehicle front body structure provided in a predetermined range including a bent portion between a floor panel.

According to the present invention, the front frame includes the front frame, the inclined frame, and the rear frame. and an inner vertical wall portion extending upward from the outer vertical wall portion from the vehicle width direction inner side of the bottom wall portion and joined to the inner portion of the floor panel. A reinforcing member provided along the inner vertical wall portion is joined to the outside in the vehicle width direction of the inner vertical wall portion of the rear frame, and the reinforcing member is located between the inclined portion of the dash panel and the floor panel in the longitudinal direction of the vehicle body. It is provided in a predetermined range including the bent portion.

As a result, in a vehicle in which the front frame is joined across the inner portion of the floor panel and the outer portion located below the inner portion, when an impact load acts on the front frame from the front of the vehicle in the event of a frontal collision, The reinforcing member can suppress out-of-plane deformation of the inner vertical wall portion extending upward from the outer vertical wall portion of the rear frame of the front frame in the vicinity of the bent portion between the inclined portion of the dash panel and the floor panel. Therefore, it is possible to suppress the out-of-plane deformation of the front frame at the time of a frontal collision, thereby suppressing the movement of the dash panel toward the passenger compartment.

The inclined portion of the dash panel has an inner portion arranged on the inner side in the vehicle width direction and an outer portion arranged on the lower side than the inner portion and on the outer side in the vehicle width direction. an outer vertical wall portion extending upward from the vehicle width direction outer side of the bottom wall portion and connected to the outer side portion of the inclined portion; and an outer vertical wall portion extending upward from the vehicle width direction inner side of the bottom wall portion to the outer vertical wall portion. and an inner vertical wall portion connected to the inner portion of the inclined portion, and the reinforcing member is provided along the inner vertical wall portion of the inclined frame so as to extend the vehicle width of the inner vertical wall portion of the inclined frame. direction outwards.

According to this configuration, when an impact load acts on the front frame from the front of the vehicle at the time of a frontal collision, the upper side of the outer vertical wall portion of the inclined frame of the front frame near the bent portion between the inclined portion of the dash panel and the floor panel. The reinforcing member can suppress the out-of-plane deformation of the inner vertical wall portion extending in the direction of the vertical wall. Therefore, it is possible to suppress the out-of-plane deformation of the front frame at the time of a frontal collision, thereby suppressing the movement of the dash panel toward the passenger compartment.

It is preferable that the reinforcing member has a substantially L-shaped cross section including a vertical surface portion extending in the vertical direction and a flange portion extending outward in the vehicle width direction from the vertical surface portion.

According to this configuration, the rigidity of the reinforcing member can be improved by the flange portion, and the out-of-plane deformation of the inner vertical wall portion of the front frame can be effectively suppressed.

The reinforcing member includes a vertical surface portion that extends in the vertical direction and is joined to the vehicle width direction outer side of the inner vertical wall portion of the rear frame. A notch portion may be provided by notching a lower side of the vertical surface portion so as to become smaller toward the rear side.

According to this configuration, it is possible to suppress a change in strength due to the reinforcing member at the rear end of the front frame, compared to the case where the notch is not provided at the rear end of the vertical surface portion, and the front frame is damaged in the event of a frontal collision. It is possible to suppress the generation of the starting point of deformation at the rear end portion.

It is preferable that a joint portion between the vertical surface portion and the inner vertical wall portion of the rear frame is provided around the notch portion.

According to this configuration, since the reinforcing member is joined to the rear frame of the front frame around the notch, it is possible to effectively suppress a change in strength due to the reinforcing member at the rear end portion of the front frame.

The reinforcing member includes a vertical surface portion that extends in the vertical direction and is joined to the outer side in the vehicle width direction of the inner vertical wall portion of the rear frame. A concave portion may be provided, and the concave portion may be provided so as to form a ridgeline between the vertical surface portion and the vertical surface portion so that the vertical length of the vertical surface portion becomes smaller toward the rear side.

According to this configuration, it is possible to suppress a change in strength due to the reinforcing member at the rear end portion of the front frame, compared to the case where the recess is not provided at the rear end portion of the vertical surface portion. It is possible to suppress the occurrence of deformation starting points at the ends.

It is preferable that a joint portion between the vertical surface portion and the inner vertical wall portion of the rear frame is provided around the ridgeline.

According to this configuration, since the reinforcing member is joined to the rear frame of the front frame around the ridgeline, it is possible to effectively suppress the strength change due to the reinforcing member at the rear end portion of the front frame.

Another reinforcing member different from the reinforcing member is joined to the rear end portion of the reinforcing member, and the other reinforcing member is joined to the vehicle body constituent member.

According to this configuration, the impact load input to the front frame at the time of a frontal collision can be dispersedly transmitted from the reinforcing member to each part of the vehicle body via the other reinforcing member.

According to the vehicle front body structure for a vehicle according to the present invention, in a vehicle in which the front frame is joined across the inner portion of the floor panel and the outer portion disposed below the inner portion, the front frame is damaged in the event of a frontal collision. Out-of-plane deformation can be suppressed to suppress movement of the dash panel toward the passenger compartment.

1 is a plan view of a vehicle front portion to which a vehicle front vehicle body structure according to an embodiment of the present invention is applied; FIG. FIG. 2 is a bottom view of the vehicle front portion to which the vehicle front vehicle body structure according to the embodiment of the present invention is applied; It is a perspective view of the principal part of the front part of a vehicle body. FIG. 2 is a cross-sectional view of the vehicle body taken along line Y4-Y4 in FIG. 1; FIG. 4 is a cross-sectional view of the vehicle body taken along line Y5-Y5 in FIG. 3; FIG. 4 is a cross-sectional view of the vehicle body taken along line Y6-Y6 in FIG. 3; FIG. 4 is a perspective view of a reinforcing panel and tie-down bracket; It is the side view and sectional drawing of a reinforcement panel. It is a perspective view of a tie-down bracket. It is a figure which shows the modification of a reinforcement panel. FIG. 4 is a diagram showing stresses generated in the front frame when a load acts on the front frame from the front of the vehicle;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a plan view of a vehicle front portion to which a vehicle front body structure according to an embodiment of the invention is applied, and FIG. 2 is a vehicle front portion to which a vehicle front body structure according to an embodiment of the invention is applied. 3 is a perspective view of the main part of the front part of the vehicle body, FIG. 4 is a cross-sectional view of the vehicle body along the Y4-Y4 line in FIG. 1, and FIG. 5 is a Y5-Y5 line in FIG. FIG. 6 is a cross-sectional view of the vehicle body taken along line Y6--Y6 in FIG.

As shown in FIGS. 1 to 6, a vehicle body 1 to which the vehicle front body structure according to the embodiment of the present invention is applied has an engine 2 mounted vertically in the front part of the vehicle body and driving rear wheels. It is an engine rear drive type body. The vehicle body 1 includes a pair of left and right front frames 3 extending in the front-rear direction, a dash panel 4 defining the front side of the vehicle compartment, and a floor panel 5 extending rearward from the dash panel 4. - 特許庁

The floor panel 5 has a tunnel portion 6 that extends in the front-rear direction and bulges upward at the center in the vehicle width direction. As shown in FIG. 3, the floor panels 5 are arranged on both sides of the tunnel portion 6 in the vehicle width direction, respectively, with an inner portion 7 arranged on the inner side in the vehicle width direction, and an inner portion 7 arranged on the lower side of the inner portion 7 and on the outer side in the vehicle width direction. and an outer portion 8 that An inclined portion 9 is provided between the inner portion 7 and the outer portion 8 and is inclined downward toward the outside in the vehicle width direction.

The vehicle width direction inner side of the inner portion 7 of the floor panel 5 is joined to the tunnel portion 6 . The vehicle width direction outer side of the outer portion 8 of the floor panel 5 is joined to a side sill 10 extending in the front-rear direction. The side sill 10 is formed in a closed cross-sectional shape by joining a side sill inner 10a forming the vehicle body inner side of the side sill 10 and a side sill outer 10b forming the vehicle body outer side of the side sill 10 .

As shown in FIG. 4, the dash panel 4 has a vertical wall portion 21 extending in the vertical direction of the vehicle body, and an inclined portion 22 extending from the lower end portion of the vertical wall portion 21 to the lower side of the vehicle body toward the rear side. are doing. The dash panel 4 divides an engine room 13 in which the engine 2 is arranged and a vehicle compartment 14 provided behind the engine room 13 to divide the front side of the vehicle compartment. The inclined portion 22 of the dash panel 4 functions as a toe board, which is a footrest for the passenger in the passenger compartment 14 . The dash panel 4 can also be composed of two members, for example, the vertical wall portion 21 and the inclined portion 22 are separately configured.

The inclined portion 22 of the dash panel 4 has a tunnel portion 23 that extends in the longitudinal direction of the vehicle body and bulges upward on the center side in the vehicle width direction. The inclined portions 22 of the dash panel 4 are arranged on both sides of the tunnel portion 23 in the vehicle width direction, respectively, as shown in FIG. An inclined portion 26 is provided between the inner portion 24 and the outer portion 25 and is inclined downward toward the outside in the vehicle width direction.

The vehicle width direction inner side of the inner portion 24 of the dash panel 4 is coupled to the tunnel portion 23 . The vehicle width direction outer side of the outer portion 25 of the dash panel 4 is coupled to the side sill 10 . The tunnel portion 23, the inner portion 24, the outer portion 25 and the inclined portion 26 of the dash panel 4 are connected to the tunnel portion 6, the inner portion 7, the outer portion 8 and the inclined portion 9 of the floor panel 5, respectively.

As shown in FIG. 4 , the front frame 3 includes a front frame 31 extending forward from a vertical wall portion 21 of the dash panel 4 and an inclined portion 22 of the dash panel 4 that slopes downward toward the rear. It has an inclined frame 32 and a rear frame 33 extending rearward along the floor panel 5 .

The front frame 3 includes a front side frame 34 extending forward from the vertical wall portion 21 of the dash panel 4 and downward along the inclined portion 22 of the dash panel 4 toward the rear side, and a rear end of the front side frame 34. and a front frame rear 35 that extends downward along the inclined portion 22 of the dash panel 4 toward the rear and extends rearward along the floor panel 5 .

As shown in FIG. 1, the front side frame 34 includes a frame side frame inner 34a formed to have a substantially hat-shaped cross section so as to bulge inward in the vehicle width direction, and a substantially hat-shaped cross section to bulge outward in the vehicle width direction. It is joined with the front side frame outer 34b formed in a shape to form a closed cross-sectional shape.

The front frame rear 35 has a substantially hat-shaped cross section so as to protrude downward. It is formed in a closed cross-sectional shape. A front end portion of the front frame rear 35 is overlapped and joined to a rear end portion of the front side frame 34 .

The front frame 31 of the front frame 3 is composed of the front side frames 34, the inclined frame 32 of the front frame 3 is composed of the front side frames 34 and the front frame rear 35, and the rear frame 33 of the front frame 3 is composed of the front It is configured by the frame rear 35 .

As shown in FIG. 5, the rear frame 33 of the front frame 3 includes a bottom wall portion 33a extending in a direction substantially orthogonal to the vertical direction of the vehicle body, and an outer vertical wall portion 33b extending upward from the vehicle width direction outer side of the bottom wall portion 33a. and an inner vertical wall portion 33c extending upward from the vehicle width direction inner side of the bottom wall portion 33a. The outer vertical wall portion 33b is connected to the outer portion 8 of the floor panel 5 by a flange portion 33d extending outward in the vehicle width direction from above, and the inner vertical wall portion 33c is connected to the floor by a flange portion 33e extending inward in the vehicle width direction from above. It is connected to the inner part 7 of the panel 5 .

The rear frame 33 of the front frame 3 is joined across the inner portion 7 of the floor panel 5 and the outer portion 8 arranged below the inner portion 7, and the inner vertical wall portion 33c is above the outer vertical wall portion 33b. , and is formed to be larger in the vertical direction than the outer vertical wall portion 33b.

As shown in FIG. 6, the inclined frame 32 of the front frame 3 also has a bottom wall portion 32a extending in a direction substantially orthogonal to the vertical direction of the vehicle body, and an outer vertical wall portion extending upward from the vehicle width direction outer side of the bottom wall portion 32a. and an inner vertical wall portion 32c extending upward from the vehicle width direction inner side of the bottom wall portion 32a. The outer vertical wall portion 32b is connected to the outer portion 25 of the inclined portion 22 of the dash panel 4 by a flange portion 32d extending outward in the vehicle width direction from the upper side, and the inner vertical wall portion 32c is a flange portion extending inward in the vehicle width direction from the upper side. It is connected to the inner portion 24 of the inclined portion 22 of the dash panel 4 by the portion 32e.

The inclined frame 32 of the front frame 3 is also joined across the inner portion 24 of the inclined portion 22 of the dash panel 4 and the outer portion 25 disposed below the inner portion 24, and the inner vertical wall portion 32c is connected to the outer vertical wall portion 32c. It extends upward from the wall portion 32b and is formed to have a length in the vertical direction greater than that of the outer vertical wall portion 32b.

In the vehicle body 1, as shown in FIG. 4, a bent portion 36 is formed between the inclined frame 32 of the front frame 3 and the rear frame 33 along the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5. is provided. A reinforcing panel 40 is provided as a reinforcing member for reinforcing the front frame 3 at the bent portion 36 of the front frame 3 .

As shown in FIGS. 5 and 6, the reinforcing panel 40 extends vertically along the inner vertical wall portion 33c of the rear frame 33 and is joined to the outer side of the inner vertical wall portion 33c of the rear frame 33 in the vehicle width direction. At the same time, it extends in the vertical direction along the inner vertical wall portion 32c of the inclined frame 32 and is joined to the outer side of the inner vertical wall portion 32c of the inclined frame 32 in the vehicle width direction. The reinforcement panel 40 is provided in a predetermined range including the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 in the longitudinal direction of the vehicle body.

FIG. 11 is a diagram showing stress generated in the front frame when a load acts on the front frame from the front of the vehicle. FIG. 11 shows stress distribution generated in the front frame 3 obtained by simulation analysis. In the simulation analysis, the stress distribution generated in the front frame 3 when a load is applied from the front of the vehicle to the front frame 3 without reinforcing panels was analyzed.

As shown in FIG. 11 , according to simulation analysis, the stress generated in the front frame 3 is high near the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 . From the simulation analysis results, when the reinforcing panel 40 is attached to the front frame 3, the stress is high in the vicinity of the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 (the portion indicated by A1 in FIG. 11). It is considered effective to provide the reinforcement panel 40 at the stress concentration portion.

FIG. 7 is a perspective view of a reinforcing panel and tie-down brackets; 8 is a side view and a cross-sectional view of the reinforcement panel, FIG. 8(a) is a side view of the reinforcement panel, and FIGS. 8(b) and 8(b) are Y8b- in FIG. 8(a) respectively. FIG. 10 is a cross-sectional view of the reinforcement panel along lines Y8b and Y8c-Y8c;

As shown in FIGS. 4 and 7, the reinforcing panel 40 is provided in a stress concentration portion A1, which is a predetermined range including the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 in the longitudinal direction of the vehicle body. ing.

As shown in FIG. 8, the reinforcing panel 40 has a vertical surface portion 41 extending in the vertical direction and a flange portion 42 extending outward in the vehicle width direction from the vertical surface portion 41, and is formed to have a substantially L-shaped cross section. 5 and 6, the vertical surface portion 41 of the reinforcing panel 40 is joined to the inner vertical wall portion 32c of the inclined frame 32 and the inner vertical wall portion 33c of the rear frame 33, and the flange portion 42 of the reinforcing panel 40 is , the inclined portion 22 of the dash panel 4 and the floor panel 5 are spaced apart from each other.

A recess 43 recessed outward in the vehicle width direction from the vertical surface portion 41 is provided at the rear end portion of the vertical surface portion 41 of the reinforcing panel 40 . A bottom surface portion 44 of the concave portion 43 extends vertically in parallel with the vertical surface portion 41 to the outside in the vehicle width direction from the vertical surface portion 41 . The concave portion 43 is provided so as to form a ridgeline 45 between the vertical surface portion 41 and the vertical surface portion 41 so that the vertical length of the vertical surface portion 41 becomes smaller toward the rear side.

In FIG. 7, the joints SW where the reinforcing panel 40 and the front frame 3 are joined by spot welding are indicated by x marks. As shown in FIG. 7, a plurality of joints SW between the vertical surface portion 41 and the inner vertical wall portion 33c of the rear frame 33 are provided in the longitudinal direction of the vehicle body of the reinforcing panel 40. are also located around the

In this way, in the inclined frame 32 and the rear frame 33 of the front frame 3 in the vicinity of the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5, the inner vertical wall portion 32c of the inclined frame 32 and the rear frame 33, A reinforcing panel 40 is joined to the outer side of 33c in the vehicle width direction in a predetermined range including the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 in the longitudinal direction of the vehicle body, thereby forming the outer vertical wall portion 32b. , 33b are prevented from deforming out-of-plane by the reinforcing panel 40, and out-of-plane deformation of the front frame 3 can be suppressed at the time of a frontal collision.

The front frame 3 also has a tie-down bracket 50 joined to the rear end of the reinforcing panel 40 as a reinforcing member different from the reinforcing member 40 joined to the front frame 3 as a vehicle body component. The tie-down bracket 50 is formed in a panel shape.

FIG. 9 is a perspective view of a tie-down bracket. As shown in FIGS. 5, 7 and 9, the tie-down bracket 50 includes a substantially rectangular body portion 51 extending along the bottom wall portion 33a of the rear frame 33 in a direction An inner flange portion 52 extending upward from the vehicle width direction inner side of the body portion 51 and an outer flange portion 53 extending upward from the vehicle width direction outer side of the main body portion 51 are formed to have a substantially U-shaped cross section.

A main body portion 51 of the tie-down bracket 50 is provided with a tie-down hole 54 with which a tie-down hook (not shown) for fixing the vehicle when transporting the vehicle is engaged. The inner flange portion 52 of the tie-down bracket 50 is provided with a protruding portion 55 protruding upward in a substantially triangular shape.

As shown in FIG. 7 , the tie-down bracket 50 is joined to the reinforcement panel 40 by overlapping the protrusion 55 with the recess 43 of the reinforcement panel 40 , and the front and rear sides of the tie-down hole 54 in the main body 51 are They are joined to the bottom wall portion 33a of the rear frame 33 of the front frame 3, respectively. In FIG. 7, the joints between the tie-down bracket 50 and the reinforcing panel 40 and the joints between the tie-down bracket 50 and the rear frame 33 are also indicated by x marks.

By joining the tie-down bracket 50 to the bottom wall portion 33a of the rear frame 33 in this way, a load is applied from the reinforcement panel 40 to the rear frame 33 behind the bent portion 11 through the tie-down bracket 50 in the event of a frontal collision. can be transmitted.

The vehicle body 1 includes a pair of left and right floor frames 15 connected to the rear end portion of the front frame 3 and extending in the front-rear direction below the floor panel 5 , and floor panels 5 disposed on both sides of the tunnel portion 6 in the vehicle width direction. A pair of left and right tunnel rains 16 extending in the longitudinal direction on the lower side and a torque box 19 connected to the front frame 3 and the side sill 10 are provided.

The vehicle body 1 also includes a pair of left and right floor reinforcing members 17 extending in the front-rear direction above the floor panel 5 . As shown in FIGS. 5 and 6, the floor reinforcing member 17 includes an upper wall portion 17a extending in a direction substantially orthogonal to the vertical direction of the vehicle body, and an inner vertical wall portion extending downward from the vehicle width direction inner side of the upper wall portion 17a. and an outer vertical wall portion 17c extending downward from the vehicle width direction outer side of the upper wall portion 17a. The inner vertical wall portion 17b is connected to the inner portion 7 of the floor panel 5 by a flange portion 17d extending inward in the vehicle width direction from below, and the outer vertical wall portion 17c is connected to a flange portion 17e extending outward in the vehicle width direction from below. is connected to the outer part 8 of the floor panel 5 by the .

The floor reinforcing member 17 extends in the longitudinal direction of the vehicle body along the front frame 3 and extends substantially linearly in the longitudinal direction across the inclined portion 22 of the dash panel 4 and the floor panel 5 . A front end portion of the floor reinforcing member 17 is joined to the inclined portion 22 of the dash panel 4, and a rear end portion of the floor reinforcing member 17 is a cross member 18 installed between the tunnel portion 6 of the floor panel 5 and the side sill 10. It extends further to the rear of the vehicle body.

In the present embodiment, the reinforcing panel 40 is joined to the outer side of the inner vertical wall portion 33c of the rear frame 33 in the vehicle width direction, and is joined to the outer side of the inner vertical wall portion 32c of the inclined frame 32 in the vehicle width direction. It is also possible to join to the outside of the inner vertical wall portion 33c of the rear frame 33 in the vehicle width direction without joining to the outside of the inner vertical wall portion 32c of the inclined frame 32 in the vehicle width direction.

As described above, in the vehicle front body structure of the vehicle according to the present embodiment, the front frame 3 includes the front frame 31, the inclined frame 32, and the rear frame 33. an outer vertical wall portion 33b extending upward from the direction outer side and joined to the outer portion 8 of the floor panel 5; an inner vertical wall portion 33c joined to the portion 7; A reinforcing member 40 provided along the inner vertical wall portion 33c is joined to the outer side of the inner vertical wall portion 33c of the rear frame 33 in the vehicle width direction. and the floor panel 5 in a predetermined range including the bent portion 11 .

As a result, in a vehicle in which the front frame 3 is joined across the inner portion 7 of the floor panel 5 and the outer portion 8 disposed below the inner portion 7, an impact load is applied to the front frame 3 from the front of the vehicle in the event of a frontal collision. is applied, the inner vertical wall portion 33c extending above the outer vertical wall portion 33b of the rear frame 33 of the front frame 3 near the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 is out of plane. Deformation can be suppressed by the reinforcing member 40 . Therefore, it is possible to suppress the out-of-plane deformation of the front frame 3 at the time of a frontal collision, thereby suppressing the movement of the dash panel 4 toward the passenger compartment.

The inclined portion 22 of the dash panel 4 has an inner portion 24 arranged on the inner side in the vehicle width direction and an outer portion 25 arranged below the inner portion 24 and on the outer side in the vehicle width direction. , a bottom wall portion 32a, an outer vertical wall portion 32b extending upward from the vehicle width direction outer side of the bottom wall portion 32a and connected to the outer portion 25 of the inclined portion 22, and a vehicle width direction inner side to the outer side of the bottom wall portion 32a. It has an inner vertical wall portion 32c that extends upward from the vertical wall portion 32b and is connected to the inner portion 24 of the inclined portion 22 . The reinforcing member 40 is provided along the inner vertical wall portion 32c of the inclined frame 32 and joined to the outer side of the inner vertical wall portion 32c of the inclined frame 32 in the vehicle width direction.

As a result, when an impact load acts on the front frame 3 from the front of the vehicle at the time of a frontal collision, the outer longitudinal edge of the inclined frame 32 of the front frame 3 near the bent portion 11 between the inclined portion 22 of the dash panel 4 and the floor panel 5 is prevented. The reinforcement member 40 can suppress the out-of-plane deformation of the inner vertical wall portion 32c extending upward from the wall portion 32b. Therefore, it is possible to suppress the out-of-plane deformation of the front frame 3 at the time of a frontal collision, thereby suppressing the movement of the dash panel 4 toward the passenger compartment.

Further, the reinforcing member 40 has a vertical surface portion 41 extending in the vertical direction and a flange portion 42 extending outward in the vehicle width direction from the vertical surface portion 41 and is formed to have a substantially L-shaped cross section. Thereby, the rigidity of the reinforcement member 40 can be improved by the flange portion 42, and the out-of-plane deformation of the inner vertical wall portion 33c of the front frame 3 can be effectively suppressed.

Further, the reinforcing member 40 includes a vertical surface portion 41 that extends in the vertical direction and is joined to the vehicle width direction outer side of the inner vertical wall portion 33c of the rear frame 33. A concave portion 43 that is recessed outward in the width direction is provided, and the concave portion 43 is provided so as to form a ridgeline 45 between the vertical surface portion 41 and the vertical surface portion 41 so that the vertical length of the vertical surface portion 41 becomes smaller toward the rear side. As a result, compared to the case where the recess 43 is not provided in the rear end portion of the vertical surface portion 41, it is possible to suppress the change in strength due to the reinforcement member 40 at the rear end portion of the front frame 3, and the front frame 3 in the event of a frontal collision. It is possible to suppress the generation of the starting point of deformation at the rear end portion of the .

A joint portion between the vertical surface portion 41 and the inner vertical wall portion 33 c of the rear frame 33 is provided around the ridgeline 45 . As a result, the reinforcement member 40 is joined to the rear frame 33 of the front frame 3 around the ridge line 45 , so that the strength change due to the reinforcement member 40 at the rear end portion of the front frame 3 can be effectively suppressed.

Further, another reinforcing member 50 different from the reinforcing member 40 is joined to the rear end portion of the reinforcing member 40 , and the other reinforcing member 50 is joined to the vehicle body constituent member 3 . As a result, the impact load input to the front frame 3 at the time of a frontal collision is distributed from the reinforcing member 40 through the other reinforcing member 50 to various parts of the vehicle body, particularly the rear frame 33 and/or the floor frame 15 located behind the bent portion. can be transmitted as

In the above-described embodiment, the reinforcing member 40 forms the ridge line 45 between the vertical surface portion 41 and the rear end portion of the vertical surface portion 41 so that the vertical length of the vertical surface portion 41 becomes smaller toward the rear side. A recessed portion 43 recessed outward in the vehicle width direction from the vertical surface portion 41 is provided. It is also possible to provide

FIG. 10 is a diagram showing a modified example of the reinforcing panel. As shown in FIG. 10, in a reinforcing panel 40' as a reinforcing member, the portion corresponding to the concave portion 43 of the reinforcing panel 40 described above is notched to change to the concave portion 43, and the length of the vertical surface portion 41 in the vertical direction is rearward. It is also possible to provide a notch portion 46 obtained by notching the lower side of the vertical surface portion 41 so as to become smaller toward the side. In this case also, as in the reinforcing member 40 shown in FIG. 7, a plurality of joints SW between the vertical surface portion 41 and the inner vertical wall portion 33c of the rear frame 33 are provided in the longitudinal direction of the vehicle body of the reinforcing member 40'. It is also provided around the portion 46 .

As described above, the reinforcing member 40' includes a vertical surface portion 41 that extends in the vertical direction and is joined to the outer side of the inner vertical wall portion 33c of the rear frame 33 in the vehicle width direction. It is also possible to provide a notch portion 46 by notching the lower side of the vertical surface portion 41 so that the vertical length of the vertical surface portion 41 becomes smaller toward the rear side.

In this case, compared to the case where the notch portion 46 is not provided at the rear end portion of the vertical surface portion 41, it is possible to suppress a change in strength due to the reinforcing member 40' at the rear end portion of the front frame 3, and to prevent the front end from crashing. It is possible to suppress the occurrence of a starting point of deformation at the rear end portion of the frame 3 .

A joint SW between the vertical surface portion 41 and the inner vertical wall portion 33 c of the rear frame 33 is provided around the notch portion 46 . As a result, the reinforcing member 40 ′ is joined to the rear frame 33 of the front frame 3 around the notch 46 , so that the strength change due to the reinforcing member 40 at the rear end of the front frame 3 can be effectively suppressed.

In this embodiment, the concave portion 43 provided at the rear end portion of the reinforcing member 40 forms a curvilinear ridgeline 45 between the vertical surface portion 41 and the vertical surface portion 41 so that the vertical length of the vertical surface portion 41 decreases toward the rear side. However, it is also possible to provide them so as to form a straight ridge line 45 . The cutout portion 46 provided at the rear end portion of the reinforcing member 40' is also formed in a curved shape so that the vertical length of the vertical surface portion 41 decreases toward the rear side, but it may be formed in a straight line shape. is also possible.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes are possible without departing from the gist of the invention.

As described above, according to the present invention, in a vehicle in which the front frame is joined across the inner portion of the floor panel and the outer portion disposed below the inner portion, the out-of-plane deformation of the front frame at the time of a frontal collision is prevented. can be suppressed to suppress the movement of the dash panel toward the passenger compartment, so there is a possibility that this type of vehicle can be suitably used.

1 Vehicle body 3 Front frame 4 Dash panel 5 Floor panel 7 Floor panel inner part 8 Floor panel outer part 11 Bending part 21 Dash panel vertical wall part 22 Dash panel inclined part 31 Front frame 32 Inclined frame 33 Rear frame 33a Bottom wall portion 33b of rear frame Outer vertical wall portion 33c of rear frame Inner vertical wall portion 40 of rear frame Reinforcement panel 41 Vertical surface portion 42 of reinforcement panel Flange portion 43 of reinforcement panel Recess 45 Ridge 46 Notch SW Joint

Claims (8)

a front frame extending in the front-rear direction; a dash panel that defines a front side of a vehicle compartment and has a vertical wall portion; A front portion of a vehicle comprising a floor panel extending rearward, wherein the floor panel has an inner portion arranged on the inner side in the vehicle width direction and an outer portion arranged below the inner portion and on the outer side in the vehicle width direction. A vehicle body structure,
The front frame includes a front frame extending forward from a vertical wall portion of the dash panel, an inclined frame inclined downward along the inclined portion of the dash panel toward the rear, and a frame extending along the floor panel. a rear frame extending rearward,
The rear frame includes a bottom wall portion, an outer vertical wall portion extending upward from the outer side of the bottom wall portion in the vehicle width direction and joined to the outer side portion of the floor panel, and an inner vertical wall portion extending upward from the outer vertical wall portion and joined to the inner portion of the floor panel;
A reinforcing member provided along the inner vertical wall portion of the rear frame is joined to the outer side in the vehicle width direction of the inner vertical wall portion of the rear frame,
The reinforcing member is provided in a predetermined range including a bent portion between the inclined portion of the dash panel and the floor panel in the longitudinal direction of the vehicle body.
A vehicle front body structure characterized by: The inclined portion of the dash panel has an inner portion arranged on the inner side in the vehicle width direction and an outer portion arranged below the inner portion and on the outer side in the vehicle width direction,
The inclined frame includes a bottom wall portion, an outer vertical wall portion extending upward from the outside of the bottom wall portion in the vehicle width direction and joined to the outside portion of the inclined portion, and an inner vertical wall portion extending upward from the outer vertical wall portion and joined to the inner portion of the inclined portion;
The reinforcing member is provided along the inner vertical wall portion of the inclined frame and is joined to the vehicle width direction outer side of the inner vertical wall portion of the inclined frame,
The vehicle front body structure according to claim 1, characterized in that: The reinforcing member is formed to have a substantially L-shaped cross section including a vertical surface portion extending in the vertical direction and a flange portion extending outward in the vehicle width direction from the vertical surface portion,
3. The front body structure of a vehicle according to claim 1 or 2, characterized in that: The reinforcing member includes a vertical surface portion extending in the vertical direction and joined to the vehicle width direction outer side of the inner vertical wall portion of the rear frame,
A notch portion is provided at the rear end of the vertical surface portion by cutting out the lower side of the vertical surface portion so that the vertical length of the vertical surface portion decreases toward the rear side.
The vehicle front body structure according to any one of claims 1 to 3, characterized in that: A joint portion between the vertical surface portion and the inner vertical wall portion of the rear frame is provided around the notch portion,
The vehicle front body structure according to claim 4, characterized in that: The reinforcing member includes a vertical surface portion extending in the vertical direction and joined to the vehicle width direction outer side of the inner vertical wall portion of the rear frame,
A concave portion recessed outward in the vehicle width direction from the vertical surface portion is provided at the rear end portion of the vertical surface portion,
The concave portion is provided so as to form a ridgeline between the vertical surface portion and the vertical surface portion, wherein the vertical length of the vertical surface portion becomes smaller toward the rear side.
The vehicle front body structure according to any one of claims 1 to 3, characterized in that: A joint portion between the vertical surface portion and the inner vertical wall portion of the rear frame is provided around the ridge line,
The vehicle front body structure according to claim 6, characterized in that: A reinforcing member different from the reinforcing member is joined to the rear end portion of the reinforcing member,
The other reinforcing member is joined to the vehicle body component,
The vehicle front body structure according to claim 6 or 7, characterized in that:

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