CN115246445A - Vehicle body front structure - Google Patents

Abstract

The present invention addresses the problem of being able to absorb collision energy generated by an SOT collision outside the front end portion of a front side frame while suppressing a passing collision with an opposing vehicle that is different in height from the front end of the front side frame of the vehicle. A vehicle body front structure (10) is provided with: a hollow front side frame (11) extending in the front-rear direction; first reinforcing plates (21 a, 21b, 21 c) having an L-shaped cross-sectional shape and arranged inside the vehicle body frame (11); and a second reinforcing plate (22) disposed in front of the first reinforcing plates (21 a-21 c) inside the vehicle body frame (11). The vehicle frame (11) has a ridge line extending in the front-rear direction, and the first reinforcing plates (21 a-21 c) are arranged so that the ridge line of the L-shaped cross section coincides with the ridge line of the vehicle frame (11). The second reinforcing plate (22) is configured such that the front end side is offset outward in the vehicle width direction than the rear end side, and the rear end side is aligned in the front-rear direction with the front end side of the first reinforcing plates (21 a-21 c).

Description

Front body structure

technical field

The present invention relates to a vehicle body front structure in which collision energy is absorbed by front side frames on both sides of the vehicle body.

Background technique

As a vehicle body front structure that absorbs collision energy by a front side frame (also referred to as a side frame), there is a technology described in Patent Document 1, for example. In this vehicle body front structure, a reinforcing plate having a U-shaped cross section is overlapped and joined to a side surface on the rear side from a position separated by a predetermined length from the front end of the side frame, thereby reinforcing the side frame. With this structure, even if a so-called micro-overlap collision occurs at a position deviated outward from the axis center of the side frame body, the side frame body can be deformed together with the reinforcing plate to absorb impact energy.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent No. 4783761

SUMMARY OF THE INVENTION

In the structure of Patent Document 1, the front portion of the side frame from the front end of the side frame to the front end of the reinforcement plate separated by a predetermined length has no reinforcement plate and only a side frame plate. Therefore, when a small overlap collision occurs at the front portion of the side frame, the front portion of the side frame may be greatly deformed in the vehicle width direction due to the collision energy. If the front portion of the frame is greatly deformed, the deformation of the reinforcing plate joining portion becomes small, and the collision energy cannot be sufficiently absorbed.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle body front structure capable of absorbing collision energy without causing large deformation of the front portion of the front side frame in the event of a small overlap collision.

In order to achieve the above object, the vehicle body front structure of the present invention is characterized by comprising: a hollow front side frame extending in the front-rear direction; a reinforcing plate; and a second reinforcing plate disposed on the front side of the first reinforcing plate inside the front side frame, the front side frame having a ridge extending in the front-rear direction, the first The reinforcing plate is arranged so that the ridgeline of the L-shaped cross-section coincides with the ridgeline of the front side frame, and the front end side of the second reinforcing plate is deviated outward in the vehicle width direction compared with the rear end side, and the The rear end side and the front end side of the first reinforcing plate are arranged in a front-rear direction.

Invention effect

According to the present invention, it is possible to obtain a vehicle body front structure capable of absorbing collision energy without greatly deforming the front portion of the front side frame in a micro-overlap collision.

Description of drawings

FIG. 1 is a side view on the outside in the vehicle width direction of a front side frame as a vehicle body front structure of an automobile according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a plurality of first reinforcing plates of an L-shaped cross section arranged within a U-shaped cross section of a front side frame.

3 is a perspective view showing a plurality of first reinforcing plates and first and second spacers arranged in an L-shaped cross section within the U-shaped cross section of the front side frame.

Fig. 4 is a sectional view taken along line IV-IV of Fig. 3 .

Fig. 5 is a side view of the vehicle body front structure of the automobile according to the present embodiment.

FIG. 6 is a perspective view showing the structure of the front side of the vehicle body viewed from the obliquely front side of the vehicle body indicated by arrow IV shown in FIG. 5 .

Fig. 7 is a perspective view showing a structure in which the connecting plate shown in Fig. 6 is removed.

Fig. 8 is a sectional view taken along line IV-IV of Fig. 5 .

Fig. 9 is a cross-sectional view taken along line V-V of Fig. 5 viewed from above.

Fig. 10 is a plan view showing three bending points of the front side frame.

Fig. 11 is a perspective view showing a bumper beam projecting portion.

Fig. 12 is a side view showing a state where the front side frame is bent upward.

Fig. 13 is a perspective view showing a bulkhead coupled to the front side frame.

Fig. 14 is a sectional view taken along line XIV-XIV of Fig. 13 .

Explanation of reference signs

10 Front body structure

11 Front side frame

11A Front side frame bent upwards

11Z sawtooth shaped front frame

11a, 11b flange

11c U-shaped section

11e U-shaped section enlarged part

11e1 upper wall

11e2 inner wall

11e3 sloped wall

11e4 outer wall

11g, 11h, 11i, 11n bend points

11j1, 11j2 Ridge

11k closed section

12 upper member

12a front end

13 Bumper beam extension

13a plate assembly

13b box part

15 Backplane

18 rear wall parts

21a, 21b, 21c First reinforcement plate

22 Second reinforcement plate

22a The lower end of the second reinforcing plate

22b Rear end of second reinforcing plate

25 Partition

25a First bulkhead

25b Second bulkhead

25a1, 25b1 bulging part

25a2 peripheral part

25a3 upper extension

25a4 lower extension

Detailed ways

<Structure of Embodiment>

Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 14 . In the description, the same reference numerals are assigned to the same elements, and repeated descriptions are omitted. In each figure, "front and rear" indicated by arrows indicates the front and rear directions of a vehicle (not shown), "left and right" indicate the width direction of the vehicle, and "up and down" indicate vertical vertical directions.

FIG. 1 is a side view on the outside in the vehicle width direction of a front side frame 11 (frame 11 ), which is a vehicle body front structure of an automobile according to the present embodiment. FIG. 2 is a perspective view showing a plurality of first reinforcement plates 21 a , 21 b , and 21 c arranged in an L-shaped cross-section within the U-shaped cross-section of the vehicle frame 11 . 3 is a side view showing a plurality of first reinforcement plates 21 a , 21 b , and 21 c , a first partition plate 25 a , and a second partition plate 25 b arranged in an L-shaped cross section within a U-shaped cross section of the vehicle frame 11 . Fig. 4 is a sectional view taken along line IV-IV of Fig. 3 .

As shown in FIG. 1 , the vehicle body front structure 10 is formed from the rear side of the vehicle body to A first reinforcing plate 21 and a second reinforcing plate 22 are sequentially joined to the front end (see FIG. 7 ). The first reinforcement plate 21 is a reinforcement plate that reinforces the vehicle body rear side of the vehicle body frame 11 , and the second reinforcement plate 22 is a reinforcement plate that reinforces the vehicle body front side of the vehicle body frame 11 .

The second reinforcement plate 22 on the front side of the vehicle body has a U-shape in cross-sectional view that is curved (deviated) outward in a curved shape as it goes from the rear end side 22b toward the front end side (see FIG. 9 ).

The 1st reinforcement board 21 is comprised from the some 1st reinforcement board 21a, 21b, 21c. The first reinforcing plate 21a is joined to the lower side in the U-shaped cross section of the vehicle frame 11, and is joined in a state where the front end of the first reinforcing plate 21a and the rear end of the second reinforcing plate 22 are in contact with each other and aligned. The first reinforcing plates 21b and 21c are joined to the upper side in the U-shaped cross section of the body frame 11 .

As shown in FIG. 2, the first reinforcing plate 21a on the lower side constitutes an L-shaped cross-sectional shape. As shown in the cross-sectional view of FIG. Ridgelines 11j1 formed by the corners of the lower vertical and lateral surfaces of the U-shaped cross-section of the frame 11 coincide with each other.

As shown in FIG. 3, the first reinforcing plates 21b and 21c on the upper side form an L-shaped cross-sectional shape. As shown in FIG. The ridgeline 11j2 formed by the side corners matches and joins the ridgeline 11j2 formed by the upper corner in the U-shaped cross section of the body frame 11 .

As shown in FIGS. 1 to 4 , a wall-shaped first partition plate 25 a and a second partition plate 25 b are provided in the hollow portion of the vehicle frame 11 to divide the hollow portion in the front and rear directions. The first partition plate 25 a and the second partition plate 25 b have flanges on the upper, lower, left, and right sides, and the flanges are joined to the upper, lower, and left and right surfaces of the body frame 11 . Moreover, the 1st partition plate 25a is provided straddling the rear end part of the upper side 1st reinforcement board 21b, and the intermediate part of the lower side 1st reinforcement board 21a. The second partition plate 25b is provided straddling the middle portion of the upper first reinforcement plate 21c and the rear end portion of the lower first reinforcement plate 21a. As shown in FIG. 4 , the opening of the frame 11 is closed by a back plate 15 which will be described later.

Next, FIG. 5 is a side view of the inner side in the vehicle width direction of the vehicle frame 11 . FIG. 6 is a perspective view showing the structure of the front side of the vehicle body viewed from the obliquely front side of the vehicle body indicated by arrow IV shown in FIG. 5 . Fig. 7 is a perspective view showing a structure in which the connecting plate shown in Fig. 6 is removed. Fig. 8 is a VIII-VIII sectional view of Fig. 5 . Fig. 9 is a cross-sectional view of the section IX-IX of Fig. 5 viewed from above.

As shown in FIG. 5 , the vehicle body front structure 10 has upper members 12 extending outside the vehicle frames 11 on both sides. The upper member 12 is curved in an arched shape from above the tire (not shown) to the front of the vehicle body. As shown in FIG.

In the body frame 11 shown in FIG. 5 , the cross-sectional shape on the rear side is a so-called hat shape. Specifically, the rear side of the frame 11 has a U-shaped cross-sectional portion 11c having a substantially U-shaped cross-sectional shape (see FIG. 8 ), and flanges 11a, 11b extending up and down from the opening-side end of the U-shaped cross-sectional portion 11c. On the other hand, as shown in FIG. 7 , the front side of the frame 11 forms a U-shaped cross-sectional enlarged portion 11e that continues from the U-shaped cross-sectional portion 11c and expands in the vehicle width direction and the vertical direction. The U-shaped section 11c and the enlarged U-shaped section 11e correspond to the "frame body" in the technical solution.

The U-shaped cross-sectional enlarged portion 11e does not have the flanges 11a and 11b like the U-shaped cross-sectional portion 11c, but has an upper wall 11e1, an inner side wall 11e2 on the inner side (also called only the inner side) in the vehicle width direction, and an outer side wall 11e2 extending from the inner side wall 11e2 to the outer side. An inclined wall 11e3 inclined downward, and an outer wall 11e4 formed by the back plate 15 (see FIG. 11 ) that closes both outer openings of the U-shaped cross-sectional enlarged portion 11e and the U-shaped cross-sectional portion 11c. In addition, both the U-shaped cross-sectional enlarged portion 11e and the U-shaped cross-sectional portion 11c constitute the frame main body described in the technical claim.

The body frame 11 becomes a hollow frame-shaped hollow portion extending in the vehicle body front-rear direction (also referred to as the front-rear direction) by closing the opening with the back plate 15 . Furthermore, as shown in FIG. 6 , the front end of the enlarged U-shaped section 11 e of the body frame 11 and the front end of the upper member 12 are connected by a connecting plate 16 .

In addition, in the inside of the enlarged U-shaped section 11e in the shape of a hollow frame shown in FIG. 7 , there is fixed a cross section vertically arranged and extended along the front and rear direction of the vehicle body so as to divide the inside into left and right in the vehicle width direction. The second reinforcing plate 22 .

The second reinforcing plate 22 is separated from the outer wall 11e4 in the frame 11 and extends rearward along the outer wall 11e4. As shown in FIG. The rear end portion 22b is joined in a state where the end portion is located at the bending point 11n of the body frame 11 indicated by a dotted line, and abuts against the front end of the first reinforcing plate 21 .

As shown in FIG. 9 , the second reinforcing plate 22 is inclined outward in the vehicle width direction from the inner side wall of the U-shaped cross-sectional portion 11c toward the front end of the U-shaped cross-sectional enlarged portion 11e , and is formed between it and the back panel 15 and is continuous with the hollow portion. The closed section 11k.

As shown in FIG. 7 , the lower end portion 22 a of the second reinforcing plate 22 is joined to the lower end portion of the outer side wall 11 e 4 of the body frame 11 . Through this coupling, the U-shaped cross-sectional enlarged portion 11e on the vehicle body front side of the body frame 11 has a large cross-sectional shape extending upward and downward.

As shown in FIG. 5 , the U-shaped cross-sectional enlarged portion 11 e has a horn shape that gradually expands in the vertical direction from the vehicle body rear side of the body frame 11 toward the front end. In more detail, the upper surface of the frame 11 extends forward and backward at a substantially constant height, and the lower surface of the frame 11 is inclined so as to be lowered toward the front end. As shown in FIG. 7 , a second reinforcing plate 22 is arranged inside the vehicle frame 11 along the trumpet shape that opens up and down. With this structure, when the oncoming vehicle crosses the vehicle, the load input (arrow Y1) is smoothly transmitted along the horn shape reinforced by the second reinforcement plate 22 to the U-shaped cross-section portion 11c on the rear side of the frame 11. transfer.

Furthermore, as shown in FIG. 9 , the enlarged U-shaped section 11 e has a flared shape that gradually expands outward from the vehicle body rear side toward the front end of the body frame 11 . More specifically, the vehicle width inner surface of the body frame 11 extends straight in the front-rear direction, and the vehicle width outer surface of the body frame 11 is inclined so as to be located on the vehicle width outer side toward the front end. A second reinforcing plate 22 is disposed inside the vehicle frame 11 along the flared outward shape. With this configuration, when an oncoming vehicle collides with the upper member 12 with a small overlap, the obliquely upward load input due to the collision is smoothly transmitted along the horn shape reinforced by the second reinforcing plate 22 toward the rear side of the frame 11 The inflection points 11g, 11h, 11i (FIG. 10) of the .

As shown in the top view of the frame 11 in FIG. 10 , the U-shaped section 11c of the frame 11 has at least three bending points 11g, 11h, and 11i in the front-rear direction of the vehicle body. The bending points 11g, 11h, and 11i are arranged in this order from the front. The bending points 11n and 11i are provided on the vehicle width outer side of the body frame 11 , and the bending point 11h is provided on the vehicle width inner side of the body frame 11 . Each bending point 11g, 11h, 11i is a "く"-shaped concave part, and the small overlapping collision load in the direction indicated by the arrow Y2 flows from the second reinforcement plate 22 (FIG. 1) combined with the vehicle frame 11 to the first The reinforcing plates 21a, 21b, and 21c (FIG. 1) pass and are bent in a zigzag shape along the vehicle width direction.

(At least one of) the first reinforcing plates 21a, 21b, and 21c is arranged along at least one ridgeline 11j1 or ridgeline 11j2 of the body frame 11 shown in FIG. 4 . In the middle where the first reinforcement plates 21a, 21b, 21c of this arrangement extend in the vehicle front-rear direction, the first reinforcement plates 21a, 21b, 21c and both sides of the U-shaped cross-section of the vehicle frame 11 are combined with the first bulkhead. 25a and the second partition 25b constitute the partition 25. In the vicinity of these partition plates 25a, 25b, the above-mentioned bending points 11h, 11i are formed on the frame 11 as weak parts. The weak portion may be a rib, a hole, or the like in addition to a bent shape serving as a bending point.

In this way, by forming the weakened portion near the bulkhead 25 that reinforces the frame 11, the force at the time of collision concentrates on the weakened portion near the reinforced portion by the bulkhead 25, so that the frame 11 and the first reinforcing plate 21a, 21b, 21c are reliably bent together.

As shown by a dotted line 11Z in FIG. 10 , the bending is that the body frame 11 is bent in a zigzag shape together with the first reinforcing plates 21 a , 21 b , and 21 c . More specifically, in the event of a collision, the bending point 11g of the U-shaped cross-sectional portion 11c bends together with the first reinforcement plates 21a, 21b at the vehicle body inner side in the vehicle width direction indicated by the arrow Yg. Furthermore, the bending point 11h is bent at a position outside the vehicle body in the vehicle width direction indicated by arrow Yh together with the first reinforcing plates 21a, 21b, and 21c, thereby bending in a zigzag shape like the frame 11Z.

In addition to the above, the first reinforcing plates 21a, 21b, and 21c may be arranged along at least two ridgelines 11j1, 11j2 of the vehicle frame 11 shown in FIG. 14 . In the middle where the first reinforcement plates 21a, 21b, 21c of this arrangement extend in the vehicle front-rear direction, the first reinforcement plates 21a, 21b, 21c and both sides of the U-shaped cross-section of the vehicle frame 11 are combined with the first bulkhead. 25a and the second partition 25b constitute the partition 25. In the vicinity of these partition plates 25a, 25b, the above-mentioned bending points 11h, 11i are formed on the body frame 11 as weak parts.

With this configuration, the first reinforcement plates 21a, 21b, and 21c are also bent together with the two ridgelines 11j1, 11j2 of the body frame 11 in the event of a micro-overlap collision, thereby increasing the amount of collision energy absorbed.

As shown in FIG. 3 , the bulkhead 25 includes at least a first bulkhead 25 a serving as an engine frame fastening portion, and a second bulkhead 25 b serving as a subframe fastening portion.

The first bulkhead 25a has a bulging portion 25a1, which has a cylindrical cavity inside and has an upper opening, and bulges outward in the vehicle width direction. The nut 26 is inserted into the cavity from the opening of the bulging portion 25a1 and fitted into together and fixed. The nut 26 has a shape in which an annular portion is fixed to a cylindrical shape in which a screw hole is formed, and the annular portion is exposed and fixed from the bulging portion 25a1. The bolts of the engine mount are screwed and tightened from the ring portion of the nut 26 .

The second partition plate 25b has a bulging portion 25b1 having a cylindrical cavity inside with a bottom opening and bulging outward. The nut 27 is inserted into the cavity from the opening of the bulging portion 25b1 to be fitted and fixed. An annular portion of the nut 26 is exposed from under the bulging portion 25b1 and is fixed. The bolts of the subframe are screwed and fastened from the ring portion of the nut 27 .

FIG. 11 is a perspective view of a part of the body frame 11 on the left side of the vehicle body viewed from the front right side. On the front surface of the connecting plate 16 that connects the front end of the vehicle frame 11 and the front end of the upper member 12, a bumper beam extension (also referred to as an extension) is fixed to show a box-shaped appearance cut in the vehicle width direction. 13. The protruding portion 13 is formed by fixing a box-shaped portion 13c in front of a polygonal plate member 13a. The plate member 13a is fixed to the front surface of the connecting plate 16 and has the same shape as the connecting plate 16. The partition wall 13b extending in the vertical direction partitions into a cross-sectional glasses shape.

As shown in FIG. 9, the partition wall 13b is arrange|positioned at the position facing the front-end|tip extended in the up-down direction of the 2nd reinforcement board 22. As shown in FIG. Due to the opposing state of the two, a collision load from an oncoming vehicle or the like in front of the vehicle body is transmitted from the partition wall 13 b of the extension portion 13 to the second reinforcement plate 22 .

The material of the first reinforcing plates 21a, 21b, and 21c shown in FIG. 2 is preferably changed as follows according to the weight of the vehicle body, that is, according to a light vehicle body or a heavy vehicle body.

That is, for a light vehicle, it is preferable to set the L-shaped cross-sectional first reinforcement plates 21a, 21b, 21c to have a thickness of 1.0 to 2.0 mm and a material of ordinary steel plate with a tensile strength of 270 MPa.

For a heavy vehicle body, it is preferable to set the L-shaped cross-sectional first reinforcement plates 21a, 21b, 21c to have a plate thickness of 1.0 to 2.0 mm, and a high-strength steel plate with a tensile strength of 440 to 980 MPa.

As shown in FIG. 3 , among the first reinforcement plates 21a, 21b, and 21c, the front end of the lower first reinforcement plate 21a protrudes forward by a predetermined length L1 than the front end of the upper first reinforcement plate 21b.

As shown in FIG. 12 , the body frame 11 is joined to the front end side of the rear wall member 18 inclined upward from the bottom of the floor panel 31 . In addition, the rear wall member 18 is arranged from below the floor panel 31 along the lower surface of a cowl lower member 32 standing upright on the front side of the instrument panel 33 from which the steering wheel 34 protrudes. That is, the body frame 11 has a bent shape extending horizontally and forwardly above the floor panel 31 . Therefore, there is a concern that deformation in which the front end of the body frame 11 is raised upward as indicated by reference numeral 11A occurs due to the micro-overlap collision.

However, the front end of the first reinforcement plate 21a on the lower side of the frame 11 protrudes forward by a predetermined length compared with the front end of the first reinforcement plate 21b on the upper side. Lifting deformation is indicated by reference 11A.

As shown in FIG. 4, among the first reinforcing plates 21a, 21b, 21c, the rear end of the upper first reinforcing plate 21b, 21c and the rear end of the lower first reinforcing plate 21a are located at the same position in the front-rear direction of the vehicle body. It is arranged at the third bending point 11i (see FIG. 10 ). With this configuration, the rearmost bending point 11i among the bending points 11g, 11h, and 11i is easily bent due to the difference in rigidity between the portion with and without the first reinforcing plate 21a, 21b, and 21c. In addition, the upper first reinforcing plate 21b constitutes the upper first reinforcing plate described in the technical solution. The lower first reinforcing plate 21a constitutes the lower first reinforcing plate described in the technical solution.

As shown in FIG. 13 , the peripheral portion 25a2 of the first bulkhead 25a holding the nut 26 on the bulging portion 25a1 overlaps and joins the upper and lower first reinforcement plates 21a and 21b arranged in the U-shaped cross section of the frame 11 . Furthermore, the first spacer 25 a has an upper extension 25 a 3 extending with a predetermined width while overlapping the upper flange 11 a of the vehicle frame 11 , and an upper extending portion 25 a 3 which overlaps the lower flange 11 b of the vehicle frame 11 . The lower extension part 25a4 extended with predetermined width below.

As shown in FIG. 14 , which is a sectional view taken along line XIV-XIV in FIG. 13 , the upper extension 25 a 3 and the lower extension 25 a 4 of the first partition 25 a are sandwiched between the upper and lower flanges 11 a , 11 b of the vehicle frame 11 and the back plate 15 . and join.

As shown in FIG. 12 , the rear end of the body frame 11 is joined to the front end side of the rear wall member 18 extending from the inclined surface of the cowl lower member 32 to the lower surface of the floor panel 31 . With such a configuration, it is only necessary to manufacture the body frame 11 as a horizontal straight portion for a plurality of different car models, and thus the mold becomes inexpensive.

<Effects of Embodiment>

Next, the characteristic configuration and effects of the vehicle body front portion structure of the present embodiment described above will be described. The vehicle body front structure 10 has a front side frame 11 extending in the vehicle body front-rear direction on the inner side in the vehicle width direction.

(1) The vehicle body front structure 10 has: a hollow front side frame 11 extending in the front-rear direction; first reinforcement plates 21a, 21b, 21c having an L-shaped cross-section arranged inside the frame 11; The second reinforcing plate 22 on the front side of the first reinforcing plates 21a to 21c is disposed inside the vehicle frame 11 . The frame 11 has ridges extending in the front-rear direction, and the first reinforcing plates 21 a to 21 c are arranged so that the ridges of the L-shaped cross-section overlap with the ridges of the frame 11 . The front end side of the second reinforcement panel 22 is deviated outward in the vehicle width direction from the rear end side, and the rear end side is aligned with the front end sides of the first reinforcement panels 21a to 21c in the front-rear direction.

According to this configuration, in the case of a slight overlap collision on the front side of the vehicle frame 11, since the second reinforcing plate 22 is arranged on the front side of the vehicle frame 11, the front part of the vehicle frame 11 will not be deformed significantly, and the The second reinforcing plate 22 transmits a small overlapping collision load to the first reinforcing plates 21 a , 21 b , and 21 c that are aligned with the second reinforcing plate 22 . Through this transmission, the body frame 11 deforms together with the first reinforcing plates 21a, 21b, and 21c to absorb collision energy. That is, the front portion of the vehicle frame 11 is not greatly deformed in the event of a slight overlapping collision, and the collision energy can be absorbed.

(2) The vehicle frame 11 has a U-shaped cross-sectional shape that opens outward in the vehicle width direction. The back plate 15 of the hollow portion extending in the direction. The rear end of the second reinforcement plate 22 abuts against the inner side wall of the vehicle frame body, and the second reinforcement plate 22 is inclined outward in the vehicle width direction from the rear end toward the front end, forming a closed section 11k between it and the back plate 15 (FIG. 9), the closed section 11k is continuous with the hollow portion.

According to this configuration, since the small overlapping collision load is transmitted from the closed cross section 11k in the front portion of the vehicle frame 11 to the rear portion, deformation of the rear portion of the vehicle frame 11 can be facilitated.

(3) A cylindrical bumper beam extension 13 is provided at the front end of the vehicle frame 11, and the front end of the second reinforcement plate 22 is disposed on the partition wall 13b that partitions the hollow portion of the extension portion 13 in the vehicle width direction. The overlapping position in the vehicle width direction.

According to this structure, since the minute overlapping collision load is efficiently transmitted from the partition wall 13b of the extension part 13 to the second reinforcement plate 22, deformation of the ridgelines of the second reinforcement plate 22 and the first reinforcement plates 21a, 21b, and 21c can be facilitated.

(4) The first reinforcing plate 21a, 21b, 21c is arranged on the vehicle frame 11 along at least one ridge line 11j1 or 11j2 of the vehicle frame 11, and in the middle of the first reinforcing plate 21a, 21b, 21c The bulkhead 25 is coupled so as to span both the first reinforcement plate 21 and the body frame 11 , and weak portions (bending points 11h and 11i ) are formed in the vicinity of the coupled bulkhead 25 .

According to this configuration, a weakened portion is formed near the bulkhead 25 that reinforces the frame 11 , whereby the force at the time of collision concentrates on the weakened portion near the reinforced portion obtained by the bulkhead 25 . Therefore, the vehicle frame 11 can be reliably bent due to the collision, and the first reinforcement plates 21a, 21b, 21c can also be bent at the ridge line together with the vehicle frame 11, thereby increasing the amount of collision energy absorbed.

(5) The bulkhead 25 includes at least a first bulkhead 25a as an engine mount fastening portion and a second bulkhead 25b as a subframe fastening portion, and the first bulkhead 25a has a nut with a threaded hole on its upper surface. 26. The second partition 25b has a nut 27 with a threaded hole on the lower surface.

According to this structure, the bolts of the engine frame are screwed and tightened to the nuts 26 of the first bulkhead 25a, and the bolts of the subframe are screwed and tightened to the nuts 27 of the second bulkhead 25b. In this state, The body frame 11 can be bent at the bending points 11g, 11h, and 11i which are weak parts. Therefore, the absorption of collision energy can be facilitated over the entire length of the vehicle frame 11 .

(6) The vehicle frame 11 has two upper and lower ridgelines 11j1, 11j2 extending in the front-rear direction, and the first reinforcement plates 21a, 21b, 21c have an upper first reinforcement plate having an L-shaped cross-sectional shape arranged along the upper ridgeline 11j2. The reinforcing plate 21b and the lower first reinforcing plate 21a having an L-shaped cross-sectional shape arranged along the lower ridge line 11j1 are provided with a vehicle frame at an intermediate position in the front-rear direction of the first reinforcing plates 21a, 21b, and 21c. The hollow part of 11 divides the partition 25 along the front and back, and the vehicle frame 11 has a weak part (bending point 11h, 11i) in the vicinity of the partition 25.

According to this configuration, the first reinforcement plates 21a, 21b, and 21c are bent at the two ridgelines 11j1, 11j2 of the body frame 11 in the event of a micro-overlap collision, so that the amount of impact energy absorbed can be further increased.

(7) The front end of the lower first reinforcing plate 21a is arranged in front of the front end of the upper first reinforcing plate 21b.

According to this configuration, the front end of the lower first reinforcement plate 21a of the vehicle frame 11 protrudes forward by a predetermined length compared with the front end of the upper first reinforcement plate 21b, so that the vehicle frame 11 is suppressed from colliding with the front end of the upper side first reinforcement plate 21b. The lifting deformation shown in 11A (refer to reference numeral 11A in FIG. 12 ) can promote zigzag deformation in the vehicle width direction at the three bending points 11g, 11h, and 11i of the vehicle body frame 11 .

(8) The weak portion is a plurality of bending points 11g, 11h, 11i formed separately from each other in the front-rear direction on the frame 11, the rear end of the upper first reinforcing plate 21b and the rear end of the lower first reinforcing plate 21a. The end is arranged at the same position in the front-rear direction of the vehicle body, and is arranged at the same position as the rearmost bending point among the plurality of bending points.

According to this configuration, the rearmost bending point 11i among the bending points 11g, 11h, and 11i can be easily bent due to the difference in rigidity between the portions having and not having the first reinforcing plates 21a, 21b, and 21c, so that further The bending at the three bending points 11g, 11h, 11i is facilitated.

(9) The body frame 11 has flanges 11 a and 11 b extending upward and downward from the upper and lower edges of the U-shaped cross section. The first separator 25a representing one of the separators 25 (the first separator 25a and the second separator 25b) has an upper extension 25a3 extending with a predetermined width while overlapping the upper flange 1a, and The lower extension part 25a4 extends with a predetermined width while overlapping the lower flange 11b. The bulkhead 25 holds the nut 26 inside the center in the vehicle width direction, and the peripheral portion 25a2 of the first bulkhead 25a overlaps and joins with the first reinforcing plates 21a, 21b arranged up and down in the U-shaped cross section of the vehicle frame 11, and The upper extension part 25a3 and the lower extension part 25a4 sandwich the flanges 11a, 11b on the upper and lower sides of the vehicle frame 11 and the back plate 15 that is joined to the flanges 11a, 11b and closes the opening of the U-shaped cross section. joint between.

According to this configuration, the bulkhead 25 can be easily assembled to the body frame 11 reinforced by the first reinforcing plates 21 a and 21 b , and the engine frame and the subframe can be bolted to the bulkhead 25 at an arbitrary position on the frame 11 .

As mentioned above, the vehicle body structure of this embodiment was demonstrated, but this invention is not limited to this, It can change suitably in the range which does not deviate from the summary of this invention.

Claims (9)

1. A vehicle body front structure, characterized in that it has: a hollow-shaped front side frame extending along the front-rear direction; a first reinforcement plate having an L-shaped cross-section disposed inside the front frame; and a second reinforcement plate disposed on the front side of the first reinforcement plate inside the front side frame, The front side frame has ridges extending along the front-rear direction, The first reinforcing plate is arranged such that the ridgeline of the L-shaped cross-section coincides with the ridgeline of the front side frame, The front end side of the second reinforcement panel is deviated outward in the vehicle width direction from the rear end side, and the rear end side is aligned with the front end side of the first reinforcement panel in the front-rear direction. 2. The vehicle body front structure according to claim 1, wherein: The front side frame has a U-shaped cross-sectional frame body that opens outward in the vehicle width direction, and a back plate that closes the opening to form a hollow extending in the vehicle front-rear direction, The rear end of the second reinforcing plate is in contact with the inner side wall of the frame body, and the second reinforcing plate is inclined outward in the vehicle width direction from the rear end toward the front end, between the second reinforcing plate and the back plate. A closed section is formed between them, and the closed section is continuous with the hollow portion. 3. The vehicle body front structure according to claim 2, wherein: A cylindrical bumper beam extension is provided at the front end of the front side frame, The front end of the second reinforcing plate is disposed at a position overlapping in the vehicle width direction with a partition wall that partitions the hollow portion of the bumper beam extension in the vehicle width direction. 4. The vehicle body front structure according to claim 1, wherein: The first reinforcing plate is disposed along at least one ridge line of the front frame on the front frame, and the first reinforcing plate is erected between the first reinforcing plate and the front frame in the middle of the first reinforcing plate. Both sides of the shelf are combined with partitions, and weak portions are formed near the partitions. 5. The vehicle body front structure according to claim 4, wherein: The partition includes at least a first partition as a fastening part of the engine frame and a second partition as a fastening part of the subframe, the first partition has a nut with a threaded hole on the upper surface, the second The separator has a nut provided with a threaded hole on the lower surface. 6. The vehicle body front structure according to claim 1, wherein: The front side frame has two upper and lower ridges extending along the front and rear directions, The first reinforcing plate has an upper first reinforcing plate having an L-shaped cross-sectional shape arranged along the upper ridgeline, and a lower second reinforcing plate having an L-shaped cross-sectional shape arranged along the lower ridgeline. a reinforcement plate, In the middle position of the front-rear direction of the first reinforcing plate, there is provided a partition plate that divides the hollow portion of the front side frame along the front-rear direction, The front side frame has a weak portion in the vicinity of the partition plate. 7. The vehicle body front structure according to claim 6, wherein: A front end of the first lower reinforcement plate is arranged in front of a front end of the first upper reinforcement plate. 8. The vehicle body front structure according to claim 6, wherein: The weak portion is a plurality of bending points formed separately from each other in the front-rear direction on the front side frame, A rear end of the first upper reinforcement panel and a rear end of the first lower reinforcement panel are arranged at the same position in the front-rear direction of the vehicle body, and are arranged at the same position as the rearmost bending point among the plurality of bending points. s position. 9. The vehicle body front structure according to claim 2, wherein: The front side frame has flanges extending upward and downward from the upper and lower edges of the U-shaped section, The partition plate has an upper extension part extending with a predetermined width while overlapping the upper flange, and a lower extension part extending with a predetermined width while overlapping the lower flange. width extended, The bulkhead holds a nut inside the center in the vehicle width direction, and the peripheral portion of the bulkhead overlaps and joins with the first reinforcing plate arranged vertically in the U-shaped cross-section of the front side frame, and The upper extension and the lower extension are sandwiched between upper and lower flanges of the front frame, and the back is engaged with the flanges to close the opening of the U-shaped cross section. between the boards and joints.

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