CN115246447A - Vehicle body front structure - Google Patents
Vehicle body front structure Download PDFInfo
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- CN115246447A CN115246447A CN202210125955.4A CN202210125955A CN115246447A CN 115246447 A CN115246447 A CN 115246447A CN 202210125955 A CN202210125955 A CN 202210125955A CN 115246447 A CN115246447 A CN 115246447A
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- side frame
- front side
- plate
- vehicle
- reinforcing plate
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- 230000002787 reinforcement Effects 0.000 claims abstract description 80
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 72
- 238000005452 bending Methods 0.000 claims description 29
- 238000005192 partition Methods 0.000 claims description 17
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 239000003351 stiffener Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 12
- 125000006850 spacer group Chemical group 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
- Vibration Prevention Devices (AREA)
- Vibration Dampers (AREA)
Abstract
The vehicle body front structure of the present invention increases the amount of impact energy absorption by reliably deforming a fragile portion, and includes: a front side frame (1) extending in the front-rear direction of the vehicle and having at least two ridge lines (1 c, 1 d); a reinforcing plate (16) that overlaps the two ridge lines (1 c, 1 d) and extends in the longitudinal direction; and a spacer 17 overlapping the reinforcing plate 16. The reinforcement plate (16) extends in the vehicle front-rear direction across the bulkhead (17), and a fragile portion (20) is formed in the vicinity of the bulkhead (17) on the front side frame (1).
Description
Technical Field
The present invention relates to a vehicle body front structure.
Background
Conventionally, a technique for manufacturing a short front side frame using a mold for a long front side frame is known (for example, patent document 1). In this technique, a reinforcement plate (reinforcing plate) is attached to the front side frame regardless of the length thereof, thereby reducing the number of molds for manufacturing the front side frame.
Documents of the prior art
Patent literature
Patent document 1: japanese patent No. 4783761
Disclosure of Invention
In such a conventional vehicle body front structure, it is not considered which portion is a reliable bending point when a load is input to the front side frame from the front, and there is room for further improvement.
The purpose of the present invention is to provide a vehicle body front structure that can increase the amount of impact energy absorption by reliably deforming a fragile portion.
The vehicle body front structure of the present invention is characterized by comprising: a front side frame extending in the front-rear direction of the vehicle and having at least two ridge lines; a reinforcing plate overlapping the two ridge lines and extending in the longitudinal direction; and a bulkhead overlapping with the reinforcement plate, the reinforcement plate extending in a vehicle front-rear direction across the bulkhead, and a weak portion being formed in the front side frame in the vicinity of the bulkhead.
Effects of the invention
According to the present invention, a vehicle body front portion structure capable of increasing an impact energy absorption amount by reliably deforming a fragile portion is provided.
Drawings
Fig. 1 is a plan view showing a vehicle body front structure according to an embodiment of the present invention in which front side frames are arranged on both left and right sides of a power compartment.
Fig. 2 is a perspective view seen in the direction of arrow II in fig. 1, illustrating a structure in which a back panel is removed from a front side frame on the left side of a vehicle body front structure having a letter 12467.
Fig. 3 is a cross-sectional view taken along the line III-III in fig. 2, illustrating the structure of the left front side frame in the vehicle body front structure according to embodiment 1.
Fig. 4 is a plan view of the left front side frame as viewed from above, illustrating a deformation mode by a two-dot chain line in the vehicle body front portion structure of embodiment 1.
Fig. 5 is a side view illustrating the structure of a left front side frame having a substantially L-shaped reinforcement plate in the vehicle body front structure according to embodiment 2.
Fig. 6 is a cross-sectional view taken along line VI-VI in fig. 5, illustrating the structure of the left front side frame in the vehicle body front structure according to embodiment 2.
Fig. 7 is a perspective view showing a structure in which a bulkhead is removed from a left front side frame in the vehicle body front structure according to embodiment 2.
Fig. 8 is a cross-sectional view of the vehicle body front structure of embodiment 2, showing a left front side frame, taken along line VIII-VIII in fig. 7.
Fig. 9 is a cross-sectional view of the vehicle body front structure of embodiment 2, taken along the line IX-IX in fig. 1, showing the structure of the left front side frame.
Fig. 10 is a plan view showing how the length of the bumper beam extension is changed and the position of the front bumper is set in the front-rear direction in the vehicle body front portion structure of the embodiment.
Description of the reference numerals
1. Front side frame
1c, 1d ridge
10. Vehicle with a steering wheel
16. Reinforcing plate
17. Partition board
20. Frangible portion
Detailed Description
[ embodiment 1 ]
Hereinafter, embodiment 1 of the present invention will be described with reference to the drawings as appropriate. The same components are denoted by the same reference numerals, and redundant description thereof is omitted. When describing the direction, the description is basically based on the front-back, left-right, or up-down seen from the driver unless otherwise specified. The "vehicle width direction" is synonymous with the "left-right direction".
As shown in fig. 1, a front portion 11 of a vehicle 10 is provided with a power chamber E for accommodating a power source such as an engine and a motor, not shown. A pair of left and right front side frames 1, 1 extending in the vehicle longitudinal direction extend on both left and right sides of the power compartment E.
The left and right front side frames 1, 1 have a substantially bilaterally symmetric shape. Therefore, in the present embodiment, the left front side frame 1 will be mainly described, and the description of the right front side frame 1 will be omitted.
A bumper attachment plate 3 over which a front bumper 30 is mounted is fixed to a front end portion 1a of the front side frame 1. A front end portion 2a extending forward and downward from the upper member 2 (see fig. 9) is fixed to the bumper engagement plate 3. The front end portion 1a of the front side frame 1 is provided on the inner side of the front end portion 2a in the vehicle width direction, aligned in the vehicle front-rear direction.
As shown in fig. 1, a bumper beam assembly 31 is attached to a front end portion 1a of the front side frame 1.
The bumper beam assembly 31 includes: a bumper beam extension 4 having a bumper joint plate 3; and a front bumper 30 connected to the pair of left and right bumper beam extensions 4, 4 and extending in the vehicle width direction.
The front bumper 30 is connected to each front side frame 1 via a pair of left and right bumper beam extensions 4, 4 and bumper joint plates 3, 3.
Further, the rear end portions 1i of the front side frames 1 are connected to the dash lower panel 5, respectively. The cowl bottom 5 is disposed to partition the power chamber E from the vehicle interior R. The front side frame 1 extends such that the rear end portion 1i is lowered toward the rear along the shape of the inclined surface of the dash lower panel 5.
As shown in fig. 2, the front side frame 1 includes: an inner wall surface 1b facing the power compartment E at an inner side surface in the vehicle width direction; upper and lower ridge lines 1c, 1d (see fig. 3) provided along the longitudinal direction of the upper and lower side edges of the inner wall surface 1b; and an upper wall surface 1e and a lower wall surface 1f connected to each other substantially perpendicularly with the ridge lines 1c and 1d interposed therebetween. In fig. 2, the back plate 15 (see fig. 3) is not depicted.
The front side frame 1 has, at the rear portion, a portion of folded flange portions 1g and 1h connected substantially perpendicularly to the upper wall surface 1e and the lower wall surface 1f, respectively. The rear portion of the front side frame 1 having the folded- back flange portions 1g and 1h is formed in a substantially hat-like shape in cross section.
A reinforcing plate 16 that overlaps the two ridge lines 1c, 1d and extends in the longitudinal direction is provided on the front side frame 1; and a partition 17 further overlapping with the outer side of the reinforcing plate 16. As shown in fig. 3, the reinforcing plate 16 is formed in a substantially v-shaped cross section 12467where the upper and lower edge portions 16b, 16c are substantially perpendicular to the bottom surface portion 16 a. The upper and lower ridges 16e, 16f of the reinforcement plate 16 are arranged to overlap the inner sides of the ridges 1c, 1d of the front side frame 1.
As shown in fig. 2, the bulkhead 17 includes a first bulkhead 8 provided in the engine fastening portion 50 of the front side frame 1 and a second bulkhead 9 provided in the subframe fastening portion 60 disposed rearward of the engine fastening portion 50. The first bulkhead 8 and the second bulkhead 9 are so-called bulkheads, and divide the internal space of the front side frame 1 in the front-rear direction.
The reinforcement plate 16 extends in the vehicle front-rear direction across the first bulkhead 8 and the second bulkhead 9.
The front side frame 1 includes a front weak portion 40, an intermediate weak portion 42, and a rear weak portion 45, which constitute the weak portion 20, in this order from the front. The front weak portion 40 is provided near the front end portion 16d of the reinforcing plate 16.
As shown in fig. 4, the front weak portion 40 is formed with a first bending point 40a that narrows in the vehicle width direction of the front side frame 1 and has an outer edge in a substantially \ "1236767character" shape in plan view.
The front side frame 1 is provided with a middle weak portion 42 and a rear weak portion 45 in the vicinity of the first bulkhead 8 or the second bulkhead 9, respectively.
The intermediate weak portion 42 has a second bending point 42b having a substantially \ "123676767in a plan view of the inner edge of the front side frame 1. The intermediate weak portion 42 forms a first bolt insertion hole 41 that opens at the upper surface of the front side frame 1.
The rear weak portion 45 has a second bolt insertion hole 44 (see fig. 2) opened in a lower surface thereof. In addition, a third bending point 45a that makes the outer edge of the front side frame 1 substantially a letter \1236767ina plan view is formed in the rear fragile portion 45.
Further, the front side frames 1 are arranged in order from the vehicle front side at a predetermined interval to the rear side, and are provided with bending points which are bent in a zigzag shape in the horizontal direction by a load input from the vehicle front side.
Further, as shown in fig. 2, the first separator 8 has a first nut 51, and the second separator 9 has a second nut 52. And is configured such that the first nut 51 of the first partition plate 8 faces the first bolt insertion hole 41 and the second nut 52 of the second partition plate 9 faces the second bolt insertion hole 44.
As shown by the two-dot chain line in fig. 4, the front side frame 1 bends at each of the front weak portion 40, the intermediate weak portion 42, and the rear weak portion 45 in response to a load input from the front.
That is, the first bending point 40a, the second bending point 42a, and the third bending point 45a of the front side frame 1 are alternately bent inward or outward in the vehicle front-rear direction in order to be alternately bent in the horizontal direction, wherein the first bending point 40a has a narrowed portion with a narrow width and has a side edge in a substantially \6767676767676767676767676742a, the second bending point 42a is disposed in the vicinity of the engine fastening portion, and the third bending point 45a is disposed in the vicinity of the subframe fastening portion.
Therefore, the front side frame 1 bends from the front weak portion 40, the intermediate weak portion 42, and the rear weak portion 45 provided separately in the front-rear direction as starting points. This can reliably increase the impact energy absorption amount.
[ embodiment 2 ]
Fig. 5 to 10 show a vehicle body front portion structure according to embodiment 2 of the present invention. Note that the same or equivalent portions as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
That is, as shown in fig. 5, the two ridge lines 1c and 1d of the front side frame 1 have an upper front reinforcement plate 26, an upper rear reinforcement plate 27, and a lower reinforcement plate 28, respectively, along the longitudinal direction. The upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are each formed into a substantially L-shaped cross section in which a vertical wall surface and a horizontal wall surface are substantially orthogonal to each other. The upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are members corresponding to the reinforcement plate 16 of embodiment 1. The upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28 are each formed to have a narrower vertical dimension than the reinforcing plate 16.
Further, a gap 29 is formed between the upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 so as to be separated from each other by a predetermined space. The gap portion 29 is formed in a space shape suitable for each of the reinforcing plates 16, the reinforcing plates 26 to 28, and the like so as to be able to be changed for the letter 1246716 of embodiment 1 and the L-shaped reinforcing plate 26 of embodiment 2, and the like.
In the front side frame 1, the upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are overlapped so that the ridge lines 26e, 27e, and 28f respectively follow the ridge line 1c and the ridge line 1 d.
The first bulkhead 8 and the second bulkhead 18 are superposed on the vehicle width direction outer sides of the upper front reinforcement panel 26, the upper rear reinforcement panel 27, and the lower reinforcement panel 28 so as to be separated in the front-rear direction. Then, the three members are joined together with the front side frame 1 so as to be overlapped (see fig. 6).
The first bulkhead 8 is disposed astride the upper front reinforcement plate 26 and the lower reinforcement plate 28. The upper and lower edges and the vehicle width inner edge of the first bulkhead 8 are joined together with the upper front reinforcement plate 26 and the lower reinforcement plate 28 and the front side frame 1 so as to overlap three.
The second partition 18 is disposed so as to straddle the upper rear reinforcing plate 27 and the lower reinforcing plate 28. The upper and lower edges and the vehicle width inner edge of the second bulkhead 18 are joined together with the upper rear gusset 27 and the lower gusset 28 and the front side frame 1 in a three-piece overlapping manner.
The upper front reinforcement plate 26 and the upper rear reinforcement plate 27 are formed shorter than the lower reinforcement plate 28 and are arranged apart from each other in the front-rear direction. And overlap the first separator 8 and the second separator 18, respectively. The upper front reinforcement plate 26 has a front end portion 26a projecting forward from the first partition plate 8.
The lower reinforcing plate 28 is disposed so as to straddle the first separator 8 and the second separator 18. The lower reinforcing plate 28 has a front end portion 28a projecting forward from the first bulkhead 8. The lower reinforcement plate 28 is provided with a rear end 28b extending rearward of the second partition plate 18. The rear end of the front side frame 1 is joined to a rear wall member extending from the inclined surface of the front wall lower plate 5 (see fig. 1) over the floor lower surface of the vehicle interior R. The rear end 28b extending along the ridge line 1d descending along the rear end of the front side frame 1 is formed so as to descend toward the rear of the vehicle.
In embodiment 2, the upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28 are configured to have the same plate thickness. Note that the plate thickness of the letter-shaped reinforcing plate 16 and the plate thicknesses of the upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28 in embodiment 1 may be set to the same plate thickness. Thus, the first separator 8 and the second separator 9 can be formed of common parts, and the number of types of parts can be reduced. In addition, the thickness is the same regardless of the use of any reinforcing plate. Further, the same shape of the partition plate can be used to make the positions of the mounting portions the same. Therefore, the mounting portions can be unified between vehicles having different necessary strengths.
The lower reinforcement plate 28 extends in the vehicle front-rear direction across the first bulkhead 8. Further, a front weak portion 40 constituting the weak portion 20 is disposed in the front side frame 1 in the vicinity of the front end portion 28a extending forward. The front side frame 1 is formed with an intermediate weak portion 42 and a rear weak portion 45 that constitute the weak portion 20 in the vicinity of the first bulkhead 8 or the second bulkhead 18.
As shown in fig. 5, in the front side frame 1, the front end portion 28a of the lower side reinforcement plate 28 on the lower ridge line 1d side portion extends forward relative to the front end portion 26a of the upper front reinforcement plate 26 on the upper ridge line 1c side portion.
In the front side frame 1, the rear end 28b of the lower side reinforcing plate 28 on the lower ridge line 1d side extends rearward of the rear end 27b of the upper side rear reinforcing plate 27 on the upper ridge line 1c side.
As shown in fig. 7, the front side frame 1 is formed by joining an upper front reinforcement panel 26, a lower reinforcement panel 28, and the first bulkhead 8 in a vehicle width direction and a vertical direction in an overlapping manner. In fig. 7, the back plate 15 (see fig. 3) is omitted from illustration. First bolt insertion holes 41 (see fig. 2) for holding fastening nuts are formed between the upper front reinforcement plate 26 and the lower reinforcement plate 28 and the first bulkhead 8.
As shown in fig. 8, a back panel 15 is disposed on the vehicle width direction outer side of the front side frame 1. The left and right widthwise side edges of the back panel 15 are joined to the folded flange portions 1g, 1h of the front side frame 1.
The first separator 8 has a pair of upper and lower tongue pieces 71, 72 sandwiched between the folded flange portions 1g, 1h and the back plate 70.
As shown in fig. 1, a bumper beam assembly 31 having a bumper beam extension 4 via a bumper joint plate 3 is provided at a front end 1a of the front side frame 1.
The bumper beam extension 4 is assembled between the bumper beam of the front bumper 30 extending in the vehicle width direction and the front end portion 1a.
As shown in fig. 9, the front end portion 1a of the front side frame 1 has a hollow structure extending in the front-rear direction, and includes an inner side wall 12 on the vehicle width direction inner side, an outer side wall 14 on the vehicle width direction outer side constituting the outer side surface of the front end portion 2a of the upper member 2, and a reinforcing wall 13 constituted by a reinforcing member constituting a partition wall which becomes an internal space of the front end portion 1a in the middle thereof.
The bumper beam extension 4 is a substantially box-shaped member extending in the front-rear direction, and has a vehicle-width-direction inner extension wall surface 22, a vehicle-width-direction outer extension outer wall 24, and an intermediate extension wall surface 23.
That is, the bumper beam extension 4 is provided with extension wall surfaces 22, 23, 24 arranged in the front-rear direction with respect to the inner wall 12, the reinforcement wall 13, and the outer wall 14 constituting the front end portion 1a. The bumper beam extension 4 is surrounded by upper and lower wall members 4a and 4b provided at the vehicle width direction intermediate position and left and right extending wall surfaces 22 and 24. The internal space of the bumper beam extension portion 4 is divided by an extension wall surface 23 extending vertically from the opposing portion of the upper and lower wall surface members 4a, 4b in parallel with the extension wall surfaces 22, 24.
The extension wall surfaces 22, 23, and 24 are arranged in the front-rear direction with respect to the three inner walls 12, the reinforcement wall 13, and the outer wall 14.
As shown in fig. 9, the bumper beam extension 4 has extension wall surfaces 22, 23, and 24 aligned with the inner wall 12, the reinforcement wall 13, and the outer wall 14 constituting the front end portion 1a of the front side frame 1.
As shown by the two-dot chain lines in fig. 10, the front-rear direction dimensions of the extension wall surfaces 22, 23, 24 can be set longer than the bumper beam extension portion 4 serving as a reference shown by the solid lines. This allows the front bumper 30 to be disposed at a position separated from the vehicle body by a desired distance, thereby improving vehicle-type compatibility.
The other configurations and operational effects are the same as or equivalent to those of the vehicle body front portion structure of embodiment 1, and therefore, the description thereof is omitted.
Next, the operational effects of the vehicle body front portion structure of the present embodiment will be described.
As shown in fig. 1, the vehicle body front structure includes: a front side frame 1 extending in the front-rear direction of the vehicle 10 and having at least two ridge lines 1c, 1 d; a reinforcing plate 16 overlapping the two ridge lines 1c, 1d and extending in the longitudinal direction; and a spacer 17 overlapping the reinforcing plate.
The reinforcement plate 16 extends in the vehicle front-rear direction across the bulkhead 17, and a weak portion 2 is formed in the vicinity of the bulkhead 17 in the front side frame 1.
Therefore, the amount of impact energy absorption can be reliably increased by the deformation of the fragile portion 2.
Specifically, the front side frame 1 reliably bends from the fragile portion 20 near the bulkhead 17 where the rigidity greatly changes in accordance with the load input from the front. The reinforcing plate 16 is bent together with the two ridge lines 1c and 1d of the front side frame 1. Therefore, the impact energy absorption amount can be increased.
As shown in fig. 3, the reinforcement panel 16 has a generally cross-section of the letter \12467.
Approximately \12467thereinforcing plate 16 of the letter cross section is bent together with the two ridge lines 1c, 1d of the front side frame 1. Therefore, the impact energy absorption amount can be increased.
As shown in fig. 5, the reinforcing plate 16 has a substantially L-shaped cross section in which the vertical wall surface and the horizontal wall surface are substantially perpendicular to each other. The reinforcement plate 16 has an upper front reinforcement plate 26, an upper rear reinforcement plate 27, and a lower reinforcement plate 28 along the upper and lower ridge lines 1c and 1d of the front side frame 1.
The upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28, which have substantially L-shaped cross sections, are bent together with the two upper and lower ridge lines 1c, 1d of the front side frame 1. Therefore, the impact energy absorption amount can be increased.
The reinforcing plate 16 of embodiment 1 shown in fig. 3 and the upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28 of embodiment 2 shown in fig. 6 may be formed to have the same plate thickness. In this case, the front side frame 1 having the ridgelines 1c, 1d, the first bulkhead 8, and the like may be constituted by common parts.
The shape of the gap 29 is set to a space shape suitable for any member such as the reinforcing plate 16 and the reinforcing plates 26 to 28. In particular, in embodiment 2 shown in fig. 6, when the upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are attached, a gap portion 29 corresponding to the thickness dimension of the letter' 12467of the reinforcement plate 16 of embodiment 1 is formed. Accordingly, the L-shaped reinforcing plate 26 and the like of embodiment 2 can be modified with respect to the letter 1246716 of embodiment 1 and the L-shaped reinforcing plate 26 and the like.
As shown in fig. 5, the front side frame 1 bends at the intermediate weak portion 42 and the rear weak portion 45, respectively, in response to a load input from the front.
Therefore, the deformation amount is increased by the entire length of the front side frame 1, and the absorption of the input load can be improved. The bulkhead 17 includes a first bulkhead 8 provided at least in the engine fastening portion 50 of the front side frame 1, and a second bulkhead 9 provided in the subframe fastening portion 60 disposed rearward of the engine fastening portion 50. The first partition plate 8 has a first nut 51 facing the first bolt insertion hole 41, and the second partition plate 9 has a second nut 52 facing the second bolt insertion hole 44.
The front weak portion 40 includes: a middle weak portion 42 having a first bolt insertion hole 41 opened at an upper surface; and a rear weak portion 45 having a second bolt insertion hole 44 opened at a lower surface. Further, the front side frame 1 is disposed in order rearward at a predetermined interval from the front of the vehicle, and is provided with a bending point which is bent in the horizontal direction in accordance with a load input from the front of the vehicle
That is, the front side frame 1 has, in order from the front of the vehicle, a first bending point 40a, a second bending point 42a, and a third bending point 45a that are alternately bent in the horizontal direction, the second bending point 42a being disposed in the vicinity of the engine fastening portion, and the third bending point 45a being disposed in the vicinity of the subframe fastening portion.
Therefore, the first bending point 40a, the second bending point 42a, and the third bending point 45a are bent in order in the vehicle front-rear direction, and a desired deformation mode can be easily set. Therefore, the absorption of the input load can be improved.
As shown in fig. 5, the upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are disposed along the two ridge lines 1c, 1d of the front side frame 1, the lower reinforcement plate 28 has a front end portion 28a extending forward across the first bulkhead 8, and the front side frame 1 is formed with a front weak portion 40 having a first bending point 40a in the vicinity of the front end portion 28 a.
The front side frame 1 is reliably bent from the first bending point 40a of the front weak portion 40 in accordance with the load input from the front. The upper front reinforcement plate 26, the upper rear reinforcement plate 27, and the lower reinforcement plate 28 are bent together with the front side frame 1 along the two ridge lines 1c and 1 d. That is, by providing the fragile portion 20 in the vicinity of the separator, the strength difference becomes large, and the separator can be reliably bent from the fragile portion. Therefore, in the bent state over the entire length of the front side frame 1, the generated moment is increased, and the amount of absorption of the impact energy can be further increased.
As shown in fig. 5, in the front side frame 1, the front end portion 28a of the lower side reinforcement plate 28 on the lower ridge line 1d side portion extends forward relative to the front end portion 26a of the upper front reinforcement plate 26 on the upper ridge line 1c side portion.
The front side frame 1 is inclined from below the floor along the lower surface of the dash lower panel, and is bent so as to extend horizontally and forward above the floor. Therefore, there is a concern that deformation may occur in which the front end is lifted upward by a load input from the front of the vehicle.
However, as shown in fig. 5, the lower reinforcing plate 28 of the present embodiment has a front end portion 28a extending forward from the front end portion 26a portion of the upper front reinforcing plate 26. This improves the rigidity of the front side frame 1 in the direction in which the front end is lifted upward, and suppresses deformation. Therefore, the deformation can be promoted in a desired horizontal direction.
In the front side frame 1, the rear end 28b of the lower side reinforcing plate 28 on the lower ridge line 1d side extends rearward of the rear end 27b of the upper side rear reinforcing plate 27 on the upper ridge line 1c side.
The rear end 28b of the lower reinforcing plate 28 extends rearward of the rear end 27b of the upper rear reinforcing plate 27 on the upper ridge line 1c side. The rigidity in the direction in which the front end of the front side frame 1 is lifted upward by the load input from the front of the vehicle can be increased, and deformation can be suppressed. Therefore, the deformation can be promoted in a desired horizontal direction. The front side frame 1 according to embodiment 2 extends so that the lower reinforcement panel 28 is lowered along the shape of the inclined surface of the cowl bottom panel 5 (see fig. 1). Therefore, the rigidity in the upward-raising direction with respect to the front end of the front side frame 1 is further improved, and the deformation is suppressed.
As shown in fig. 7, the front side frame 1 is formed by joining an upper front reinforcement panel 26 and a lower reinforcement panel 28 to the first bulkhead 8 in a vehicle width direction in an overlapping manner. First bolt insertion holes 41 (see fig. 2) for holding fastening nuts are formed between the upper front reinforcement plate 26 and the lower reinforcement plate 28 and the first bulkhead 8.
Further, a back panel 15 is disposed on the vehicle width direction outer side of the front side frame 1. The left and right widthwise side edges of the back panel 15 are joined to the folded flange portions 1g, 1h of the front side frame 1.
The first separator 8 has a pair of upper and lower tongue pieces 71, 72 sandwiched between the folded flange portions 1g, 1h and the back plate 70.
The tongue pieces 71, 72 of the first bulkhead 8 are joined to the front side frame 1 reinforced by the upper front reinforcement plate 26 and the lower reinforcement plate 28 so as to be sandwiched between the back plates 15. Thereby facilitating setting the fastening nut at a desired position.
Further, fastening portions are provided at portions where the rigidity is improved by the upper front reinforcing plate 26 and the lower reinforcing plate 28.
Therefore, by providing fastening portions such as the engine mount, the transmission case, and the sub-frame at arbitrary positions of the front side frame 1 and fastening them with fastening bolts, desired mounting strength can be obtained.
As shown in fig. 1, a bumper beam assembly 31 having a bumper beam extension 4 via a bumper joint plate 3 is provided at a front end 1a of a front side frame 1.
The left and right bumper beam extension portions 4, 4 of the bumper beam assembly 31 are assembled between the rear surface sides of the left and right ends of the front bumper 30 extending in the vehicle width direction and the bumper joint plates 3 provided at the front end portions 1a, 1a.
As shown in fig. 9, the bumper beam extension 4 is provided with extension wall surfaces 22, 23, and 24 arranged in the front-rear direction with respect to the inner wall 12, the reinforcement wall 13, and the outer wall 14 constituting the front end portion 1a. The bumper beam extension 4 is formed in a substantially box shape by covering the periphery of the extension wall surfaces 22, 23, 24 with vertical and horizontal wall surface members.
The front-rear length of the bumper beam extension 4 can be changed by changing the front-rear direction dimensions of the extension wall surfaces 22, 23, 24, so that the same bumper beam can be assembled for a plurality of vehicle types. In particular, the extension wall surfaces 22, 23, and 24 of the bumper beam extension portion 4 are arranged in the front-rear direction with respect to the inner wall 12, the reinforcement wall 13, and the outer wall 14 that constitute the front end portion 1a of the front side frame 1. Therefore, by calculating and setting the front-rear length of the bumper beam extension 4 corresponding to the load input from the front, a desired strength can be easily obtained.
As described above, in the vehicle body front portion structure of the present embodiment, the fragile portion 20 reliably deforms the entire front side frame 1, and the impact energy absorption amount can be increased.
Further, the respective reinforcing plates may have the same plate thickness. In this case, even if any reinforcing plate is used, the mounting portion can be configured at the same position by the partition plate having the common shape. Therefore, by using common parts between vehicle types having different required strengths due to different vehicle weights or the like, the number of parts can be reduced while suppressing an increase in the number of parts to reduce the overall manufacturing cost.
For example, the front side frame 1 may be manufactured by a horizontal straight portion, and thus the mold becomes inexpensive. A reinforcement plate laminated portion having the same plate thickness is formed in a part of the front side frame 1. Thus, even if the vehicle models are different, the vehicle width direction positions of the first nuts 51 are aligned, and the engine fastening portion 50 and the subframe fastening portion 60 can be shared.
The present invention is not limited to the above embodiments, and various modifications can be made. The above embodiments are examples for explaining the present invention for easy understanding, and are not limited to having all the configurations explained. In addition, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment, and the configuration of another embodiment may be added to the configuration of one embodiment. In addition, a part of the configuration of each embodiment can be deleted, or added or replaced with another configuration. Examples of modifications that can be made to the above embodiment are as follows.
In the present embodiment, the reinforcing plate 16 is formed to have the same plate thickness but a different shape than the upper front reinforcing plate 26, the upper rear reinforcing plate 27, and the lower reinforcing plate 28. However, the present invention is not limited to this, and may be made of, for example, steel sheets having different rigidities, fiber materials, or a mixture thereof, or may not have the same plate thickness. The thickness of the reinforcement plate laminated portion where the reinforcement plate 16 is laminated on the front side frame 1 may be the same as the thickness of the first separator 8 and the like.
In the present embodiment, the description has been given by taking the example of using the first separator 8 and the second separator 9, but the present invention is not limited to this. For example, a single separator or a plurality of separators of three or more may be used. That is, the shape, number, and material of the separator are not particularly limited.
Claims (10)
1. A vehicle body front structure is characterized by comprising:
a front side frame extending along the front-rear direction of the vehicle and having at least two ridge lines;
a reinforcing plate overlapping the two ridge lines and extending in the longitudinal direction; and
a separator plate overlapping with the reinforcing plate,
the reinforcement plate is provided extending in the vehicle front-rear direction across the bulkhead,
the front side frame has a weak portion formed in the vicinity of the bulkhead.
2. The vehicle body front structure according to claim 1,
the stiffener plate has a generally v 12467.
3. The vehicle body front structure according to claim 1,
the reinforcing plate is formed into a substantially L-shaped cross section and has an upper reinforcing plate and a lower reinforcing plate along upper and lower ridge lines of the front side frame,
a gap portion is provided between the upper reinforcing plate and the lower reinforcing plate.
4. The vehicle body front structure according to claim 1,
the separator has: a first bulkhead provided at least at an engine fastening portion of the front side frame; and a second partition plate provided at a sub-frame fastening portion disposed rearward of the engine fastening portion,
the fragile portion has: a middle weak portion having a first bolt insertion hole opened at an upper surface thereof; and a rear weak portion having a second bolt insertion hole opened on a lower surface, and provided with a bending point bent in a horizontal direction in accordance with a load input from a front side of the vehicle by being sequentially disposed rearward at a predetermined interval from the front side of the vehicle of the front side frame,
the first partition plate has a first nut facing the first bolt insertion hole, and the second partition plate has a second nut facing the second bolt insertion hole.
5. The vehicle body front structure according to claim 4,
the front side frame has, in order in the vehicle front-rear direction, a first bending point, a second bending point, and a third bending point that are alternately bent in the horizontal direction, the second bending point being disposed in the vicinity of the engine fastening portion, and the third bending point being disposed in the vicinity of the sub frame fastening portion.
6. The vehicle body front structure according to claim 1,
the reinforcement plate is disposed along two ridge lines of the front side frame and has a front end portion extending forward across the bulkhead, and a front weak portion having a first bending point in the vicinity of the front end portion is formed in the front side frame.
7. The vehicle body front structure according to claim 1,
the lower ridge side portion of the reinforcing plate extends forward than the upper ridge side portion.
8. The vehicle body front structure according to claim 1,
the upper ridge line side portion of the reinforcing plate extends rearward than the lower ridge line side portion.
9. The vehicle body front structure according to claim 1,
the front side frame has: a fastening nut that engages the reinforcement panel and the bulkhead in an overlapping manner in the vehicle width direction and is held between the bulkhead and the reinforcement panel; and a back panel disposed on an outer side of the front side frame in the vehicle width direction and joined to the folded flange portion of the front side frame,
the partition has a tongue piece sandwiched between the folded-back flange portion and the back plate.
10. The vehicle body front structure according to claim 1,
a bumper beam assembly attached to a front end portion of the front side frame,
the bumper beam assembly has a bumper beam extension portion assembled between the front end portion and a bumper beam extending in the vehicle width direction,
the bumper beam extension portion is provided with an extension wall surface arranged in the front-rear direction with respect to a wall surface constituting the front end portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-073939 | 2021-04-26 | ||
| JP2021073939A JP2022168460A (en) | 2021-04-26 | 2021-04-26 | Vehicle body front part structure |
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| Publication Number | Publication Date |
|---|---|
| CN115246447A true CN115246447A (en) | 2022-10-28 |
| CN115246447B CN115246447B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210125955.4A Active CN115246447B (en) | 2021-04-26 | 2022-02-10 | Front structure of vehicle body |
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| Country | Link |
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| JP (1) | JP2022168460A (en) |
| CN (1) | CN115246447B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102470901A (en) * | 2009-09-02 | 2012-05-23 | 本田技研工业株式会社 | Vehicle body front structure |
| CN107031723A (en) * | 2015-10-26 | 2017-08-11 | 本田技研工业株式会社 | Car body fore part arrangement |
| CN108974133A (en) * | 2017-05-30 | 2018-12-11 | 本田技研工业株式会社 | Car body fore part arrangement |
| CN109204512A (en) * | 2017-06-29 | 2019-01-15 | 本田技研工业(中国)投资有限公司 | The reinforcement structure at front longitudinal beam rear portion |
| JP2021008236A (en) * | 2019-07-02 | 2021-01-28 | 本田技研工業株式会社 | Vehicle body front structure |
-
2021
- 2021-04-26 JP JP2021073939A patent/JP2022168460A/en active Pending
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- 2022-02-10 CN CN202210125955.4A patent/CN115246447B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102470901A (en) * | 2009-09-02 | 2012-05-23 | 本田技研工业株式会社 | Vehicle body front structure |
| CN107031723A (en) * | 2015-10-26 | 2017-08-11 | 本田技研工业株式会社 | Car body fore part arrangement |
| CN108974133A (en) * | 2017-05-30 | 2018-12-11 | 本田技研工业株式会社 | Car body fore part arrangement |
| CN109204512A (en) * | 2017-06-29 | 2019-01-15 | 本田技研工业(中国)投资有限公司 | The reinforcement structure at front longitudinal beam rear portion |
| JP2021008236A (en) * | 2019-07-02 | 2021-01-28 | 本田技研工業株式会社 | Vehicle body front structure |
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| Publication number | Publication date |
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| JP2022168460A (en) | 2022-11-08 |
| CN115246447B (en) | 2024-05-14 |
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