JP2005161938A - Vehicle body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front structure capable of enhancing the supporting property for both the vertically input load and the longitudinally input load. <P>SOLUTION: A front pillar 20 is arranged substantially perpendicularly over the entire length, and an inclined pillar 60 is connected to an upper end 20a of the front pillar and a front portion of a hood ridge member 10. The vertically input load F1 such as the rollover is efficiently supported by the front pillar 20 and the inclined pillar 60, and the longitudinally input load F2 is received by the front pillar 20 and efficiently distributed to skeleton members behind a vehicle body. The supporting property of both the vertically input load F1 and the longitudinally input load F2 can be effectively enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure extending from a hood ridge portion to a front pillar portion and a roof portion.

  In the front part of the vehicle body, hood ridge members are extended in the vehicle longitudinal direction on both sides in the vehicle width direction, and the vehicle body rear end of the hood ridge member is connected to the upper and lower intermediate parts of the front pillar (for example, Patent Document 1).

By connecting the hood ridge member to the front pillar in this manner, the collision load input to the hood ridge member at the time of a frontal collision is supported by the front pillar.
JP 2001-80544 A (page 4, FIG. 2)

  However, in such a conventional vehicle body front structure, the substantially upper half portion located on the side of the front window glass of the front pillar is generally inclined toward the rear of the vehicle body, and the center of curvature is located in the interior of the vehicle interior. Is curved so as to be located at

  For this reason, when the vehicle body rolls over and receives a vertical impact load, the front pillar that is inclined rearward and curved inward has its inclination starting point and bending starting point (these inclination and bending Each starting point portion is substantially the same position, and a large bending moment is generated in the upper and lower intermediate portions of the pillar.

  On the other hand, for the collision load that is input from the hood ridge member to the front pillar due to frontal collision, etc., in order to disperse this efficiently to the rear of the vehicle body, the inclination angle (rearward inclination angle) of the front pillar with respect to the horizontal surface of the vehicle body is made smaller. Then, it is preferable to sharpen.

  However, when the front pillar is sharpened in this way, the bending moment is further increased with respect to the vertical impact load, which satisfies both the vertical input load and the longitudinal input load input form. It ’s difficult.

  Therefore, the present invention provides a vehicle body front part structure capable of enhancing supportability for both the vertical input load and the longitudinal input load.

  The vehicle body front structure of the present invention has a hood ridge member extending in the vehicle longitudinal direction on both sides in the vehicle width direction of the vehicle body front portion, and connected to the vehicle body rear end of each hood ridge member. A substantially vertical front pillar provided, a front roof rail extending across the upper end of each front pillar and extending in the vehicle width direction, and connecting to the upper end of each front pillar and extending rearward of the vehicle body The main feature is that it includes a roof side rail, a front pillar upper end portion in which the front pillar, the front roof rail, and the roof side rail are assembled, and an inclined pillar connected across the front portion of the hood ridge member. Features.

  According to the present invention, the front pillar is disposed substantially vertically as a whole, and the inclined pillar is connected across the upper end portion of the front pillar and the front portion of the hood ridge member. For the input load, the front pillar and the inclined pillar efficiently support the vertical input load.

  On the other hand, with respect to the frontal collision load, the input load of the hood ridge member is received by the substantially vertical front pillar, and the input load can be supported by efficiently distributing the load to the roof side rail via the inclined pillar. Therefore, it is possible to effectively enhance the support for both the vertical input load such as rollover and the front and rear input load such as frontal collision.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 4 show a first embodiment of the present invention, FIG. 1 is an exploded perspective view of a main part structure of a front part of a vehicle body, and FIG. 2 shows the action of the front part structure of a vehicle body on a vertical input load. FIG. 3 is a schematic front view showing a comparison between the case of the embodiment and the conventional case of (b), and FIG. 3 shows the action of the vehicle body front structure on the vertical input load in the case of this embodiment of (a) and the case of (b). FIG. 4 is a schematic side view showing a comparison with the conventional case, and FIG. 4 shows the action of the front structure of the vehicle body with respect to the longitudinal input load in the case of the present embodiment of (a) and the conventional case of (b). It is a schematic side view.

  As shown in FIG. 1, the vehicle body front portion structure of the first embodiment includes a hood ridge member 10 extending in the vehicle longitudinal direction on both sides in the vehicle width direction of the vehicle front portion, and the vehicle body rear side of each hood ridge member 10. The front pillars 20 that are connected to the end portions 10a and are erected in the vertical direction of the vehicle body as viewed from the side and are connected across the upper end portions 20a of the front pillars 20 and extend in the vehicle width direction. A front roof rail 30 positioned at the front of the vehicle body of the roof portion R and a roof side rail 40 connected to the upper end portion 20a of each front pillar 20 and extending rearward of the vehicle body and positioned on both sides of the roof portion R in the vehicle width direction. And.

  For the sake of convenience, FIG. 1 shows one side (left side) of the front portion of the vehicle body, and the hood ridge member 10, the front pillar 20, and the roof side rail 40 provided as a pair of left and right are shown only on one side.

  The hood ridge member 10 is formed in a closed cross section having a rectangular cross section by connecting a hood ridge reinforcement 11 having an inverted L-shaped section and a dash side member 12 having an L-shaped cross section. A reinforcing member 13 having an L-shaped cross section that forms a hollow portion therebetween is coupled to the inside of the corner portion of the force 11 to form a double closed cross-sectional shape.

  The front pillar 20 is formed in a hollow shape with a closed cross section by connecting a pillar outer 21 and a pillar inner 22 formed in hat-shaped cross sections projecting in opposite directions, and an upper end portion 20a thereof inward in the vehicle width direction. It is slightly bent.

  The front roof rail 30 is coupled to the upper end portion 22a of the pillar inner 22 and extends in the vehicle width direction. The front roof rail 30 is formed in a hat-shaped cross section that protrudes downward substantially along the cross-sectional shape of the upper end portion 22a. The roof panel Rp is joined so as to have a closed cross section.

  The roof side rail 40 continuously extends from the upper end 21 a of the pillar outer 21 to the rear of the vehicle body, and has a roof side outer 41 formed in a hat-shaped cross section protruding upward, and an upper end 22 a of the pillar inner 22. A closed side surface is formed by connecting a roof side inner 42 formed in a hat-shaped cross section that is coupled to the rear side of the vehicle body and extends rearward of the vehicle body and projects downward.

  An air box 50 and a strut housing 51 are coupled to the side end of the dash side member 12 in the vehicle width direction.

  Here, in this embodiment, the front pillar 20, the front roof rail 30, and the roof side rail 40 are joined together to be connected to the pillar upper end portion 20 a and the front end portion of the hood ridge member 10. A pillar 60 is connected.

  In the present embodiment, the substantially lower half of the pillar inner 22 is constituted by the dash side member 12, and the substantially upper half of the front pillar 20 constituted by the pillar inner 22 and the pillar outer 21, that is, a hood ridge member. The upper part from the connecting part with 10 is formed with an inclination with a slight curvature on the inside because of the shape of the vehicle body.

  At this time, the inclined pillar 60 is formed with a triangular truss structure T having a top at the upper end in a side view between the hood ridge member 10 and the front pillar 20.

  In the present embodiment, the inclined pillar 60 is integrally formed with mounting flanges 61 and 62 along the upper side of the hood ridge member 10 and the front side of the front pillar 20 from the lower end 60a and the upper end 60b.

  As shown in FIG. 2A, the inclined pillar 60 extends substantially vertically from the upper connecting portion 60b when viewed from the front, and the lower connecting portion 60a is coupled to the hood ridge member 10, and the inclined pillar 60 is inclined. Even when the pillar 60 is disposed offset to the inner side in the vehicle width direction with respect to the substantially upper half of the front pillar 20 and viewed from the front, the inclined pillar 60, the hood ridge member 10, and the front pillar 20 can A truss structure T having a triangular shape is formed.

  Then, as shown in FIG. 3A, the roof side rail 40, the front pillar 20, and the center pillar 70 erected in the vertical direction of the vehicle body behind the vehicle body are arranged in a gate shape in a side view, The vertical load F1 input to the roof portion R is supported by the axial reaction force between the front pillar 20 and the center pillar 70 using the roof side rail 40 as a load receiving member.

  With the above-described configuration, according to the vehicle body front structure of the first embodiment, the front pillar 20 is arranged substantially vertically as viewed from the side, and the upper end 20a of the front pillar 20 and the hood ridge member 10 are Since the inclined pillar 60 is connected across the front portion, the front pillar 20 and the inclined pillar 40 can efficiently support the vertical input load F1 with respect to the vertical input load F1 such as rollover. it can.

  On the other hand, with respect to the front / rear input load F2 at the time of frontal collision or the like, the input load of the hood ridge member 10 is received by the substantially vertical front pillar 20 and is efficiently distributed to the roof side rail 40 side via the inclined pillar 60. Therefore, it is possible to effectively enhance the supportability of both the vertical input load F1 such as rollover and the front and rear input load F2 such as frontal collision.

  That is, when a vertical input load F1 that is input substantially obliquely from the upper side during vehicle rollover is considered from the front of the vehicle as shown in FIG. 2, in the conventional structure, as shown in FIG. The front pillar Pf receives a moment M1 that bends inward in the vehicle width direction by a vertical input load F1 obliquely upward. For this reason, it becomes a deformation mode that bends from the vicinity of the curvature starting point a of the front pillar Pf, and as a countermeasure, the bending is suppressed by expanding or reinforcing the cross section.

  On the other hand, in the structure of the present embodiment, as shown in FIG. 2 (a), even when the substantially upper half of the front pillar 20 is slightly inclined inward in the vehicle width direction, inward in the vehicle width direction. Since the inclined pillars 60 are arranged in the vertical direction so that the triangular truss structure T is formed when viewed from the front, the generation of bending moment in the front pillar 20 is suppressed, and the front pillar 20 and the inclined pillars are suppressed. 60, the vertical input load F1 can be received by the respective axial reaction forces.

  Further, considering the case where the vertical input load F1 is applied from the side of the vehicle as shown in FIG. 3, in the conventional structure, the vertical input load F1 is applied to the roof side rail Rs as shown in FIG. In the front pillar Pf, the starting point a of the forward / backward inclination is bent by the moment M2, and the roof side rail Rs receives a bending moment M3 in the vicinity of the coupling portion of the center pillar Pc as a fulcrum.

  On the other hand, in the structure of the present embodiment, the roof side rail 40 is supported by the axial reaction force with the front pillar 20 and the center pillar 70 that are substantially vertical when viewed from the side, and the moment M4 due to the deformation of the roof side rail 40 is obtained. M4 ′ can be supported by the tension pillar 60 with a tensile reaction force.

  Here, considering the case where the roof side rail 40 is reinforced, in the conventional example, the front pillar Pf has to be reinforced continuously and integrally to suppress bending, but in this embodiment, the front pillar 20 and the center pillar 70 support. What is necessary is just to reinforce so that it may not bend in the range.

  Further, when the front / rear input load F2 is applied to the frontal collision of the vehicle from the front side of the vehicle body as shown in FIG. 4, in the conventional structure, from the hood ridge member Mf as shown in FIG. The transmitted load F2 is transmitted to the front pillar Pf that is inclined rearward of the vehicle body. At this time, the axial component is transmitted, and the rest is received as a moment M5.

  In order to improve the load transmission amount at this time and suppress the moment M5, it is necessary to make the inclination angle an acute angle and to receive the load as an axial component more. When a load is applied to Pf, both become contradictory factors and contradict each other.

  On the other hand, in the present embodiment, as shown in FIG. 4A, the front / rear input load F2 transmitted from the hood ridge member 10 is received by the substantially vertical front pillar 20, and the front pillar 20 has sufficient strength and coupling portion. When the cross-sectional reinforcement is performed, a moment M6 is generated at the upper and lower connecting portions.

  The reinforcement of the front pillar 20 is consistent with the reinforcement in the case where a load is applied to the front pillar 20 from substantially obliquely upward when the vehicle rolls over, and both performances can be improved.

  At this time, if a load transmission member such as a door guard bar Gd is arranged on the extension of the hood ridge member 10 on the rear side of the vehicle body with the front pillar 20 interposed therebetween, for example, as indicated by a virtual line in the figure, the entire front pillar 20 is provided. Load transmission to the rear of the vehicle body can be performed smoothly without strengthening, and generation of the moment M6 at the upper and lower connecting portions of the front pillar 20 can be suppressed.

  Further, in the present embodiment, the inclined pillar 60 itself does not need to have a large cross section, and forward visibility can be improved.

  Further, in this embodiment, in addition to the above-described effects, the vertical load F1 input to the roof portion R is caused by the axial reaction force between the front pillar 20 and the center pillar 70 using the roof side rail 40 as a load receiving member. Since it is configured to be supported, when the roof side rail 40 and the front pillar 20 receive the vertical input load F1, the stress concentration at each coupling portion suppresses the generation of bending moment and efficiently suppresses cabin deformation. Can do.

  Further, since the inclined pillar 60 has a truss structure formed between the hood ridge member 10 and the front pillar 20, when the front and rear input loads F2 are received at the front end of the hood ridge member 10, the inclined pillar 60 is moved to the hood ridge member 10. Can be suppressed, and the axial reaction force can be easily maintained, so that the amount of load transmitted to the rear can be increased.

  In addition, since the space of the truss structure portion is reinforced by the peripheral portion of the front window glass and the resin as the filler, the deformation of the inclined pillar 60 can be suppressed.

  By the way, as shown in FIG. 1, it is preferable that at least a part of the inclined pillar 60, that is, a rear member, form the pillar inner 22 of the front pillar 20 and a part of the front roof rail 30 in this case. In addition, the coupling strength of the inclined pillar 60, the front pillar 20, and the front roof rail 30 can be further increased, and continuous strength can be easily obtained at the coupling portion, and the load dispersion effect can be further enhanced.

  5 to 8 show a second embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 6 is an enlarged sectional view taken along the line AA in FIG. 5, FIG. 7 is an exploded perspective view showing an enlarged portion B in FIG. 5, and FIG. 8 is taken along the line CC in FIG. It is an expanded sectional view along.

  As shown in FIGS. 5 and 6, the vehicle body front structure of the second embodiment is provided with a foam member, for example, foam resin 80, as a reinforcing member in the closed cross section of the front pillar 20 formed in a closed cross section structure. It is.

  Hat-shaped cross-section members 81 and 82 are attached to the connecting portion B between the front pillar 20 and the front roof rail 30 as reinforcing members that are continuous across the members 20 and 30.

  The hat-shaped cross-sectional members 81 and 82 are formed with a double hollow portion in the closed cross-section of the front pillar 20 and the front roof rail 30, and one hat-shaped cross-sectional member 81 is a pillar inner of the front pillar 20. 22, and the other hat-shaped cross-section member 82 is coupled to the inside of the roof side 30, and both the hat-shaped cross-section members 81, 82 form a continuous cross-sectional shape, The ends are overlapped and joined.

  Therefore, according to the second embodiment, since the foamed resin 80 is attached in the hollow portion of the front pillar 20, the front pillar 20 can be reinforced by this, and an increase in weight is suppressed by using the foamed resin 80. be able to.

  In this case, although the weight slightly increases, a reinforcing member such as a foam metal can be used instead of the foam resin 80.

  In addition, since the hat-shaped cross-sectional members 81 and 82 that are connected to each other and extend across the front pillar 20 and the roof side 30 are attached, the front pillar 20 and the front roof rail 30 can be continued to increase the strength. Furthermore, by using the hat-shaped cross-sectional members 81 and 82 as the reinforcing members, a great reinforcing effect can be obtained.

  FIG. 9 shows a third embodiment of the present invention, in which the same components as those of the above-described embodiments are denoted by the same reference numerals and redundant description is omitted, and FIG. 9 is taken along line AA in FIG. It is a corresponding expanded sectional view.

  As shown in FIG. 9, the vehicle body front portion structure of the third embodiment includes a hat-shaped cross-sectional member 83 that forms a double hollow portion with the front pillar 20 as a reinforcing member to be attached in the hollow portion of the front pillar 20. In addition, a foamed resin 80 as a foamed member is filled in the hollow portion of the hat-shaped cross-sectional member 83.

  The hat-shaped cross-sectional member 83 is welded to the pillar inner 22 of the front pillar 20 at both end flange portions.

  Therefore, according to the third embodiment, by using the hat-shaped cross-section member 83, the reaction force of the front pillar 20 can be further increased, and the foam-shaped cross-section member 83 can be used as a foam member in the hollow portion. Since the foamed resin 80 is filled, the strength can be further improved.

  In the present embodiment, as shown in FIG. 9, the hat-shaped cross-sectional member 83 may be bonded to the pillar outer 21 via the structural adhesive 84, and further, the hat-shaped cross-sectional member 83 is bonded to the pillar outer 21. And may be bolted to the pillar inner 22.

  FIGS. 10 and 11 show a fourth embodiment of the present invention, in which the same components as those in the above-described embodiments are denoted by the same reference numerals and redundant description is omitted. FIG. 10 is a front pillar and a front roof rail. FIG. 11 is an enlarged cross-sectional view taken along the line DD in FIG. 10.

  As shown in FIGS. 10 and 11, the vehicle body front portion structure of the fourth embodiment is a foamed member straddling the hollow portion of both members at the connecting portion between the front pillar 20 and the front roof rail 30 having a closed cross-sectional structure. A foamed resin 80 is attached.

  Therefore, according to the fourth embodiment, the foamed resin 80 attached to the connecting portion between the front pillar 20 and the front roof rail 30 functions as a reinforcing member, and the front pillar 20 and the front roof rail 30 are the same as in the second embodiment. However, the use of the foamed resin 80 can further reduce the weight.

  12 and 13 show a fifth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 12 shows an inclined pillar portion. FIG. 13 is an enlarged cross-sectional perspective view taken along line EE in FIG.

  The vehicle body front structure according to the fifth embodiment has a closed cross-sectional structure in which the inclined pillar 60 shown in FIG. 12 is hollowly formed as shown in FIG.

  Therefore, according to the fifth embodiment, since the inclined pillar 60 has a closed cross-sectional structure, the strength can be improved and the overall cross-sectional area can be reduced, so that the forward visibility can be improved.

  Further, in the fifth embodiment, as shown in FIG. 14, the strength of the inclined pillar 60 can be further increased by filling the hollow portion of the inclined pillar 60 with a foam member as a reinforcing member, for example, the foamed resin 80. Furthermore, forward visibility can be improved.

  Further, as shown in FIG. 15, two press parts 63 and 64 may be joined to form a hollow portion 65 in a part between them, and further, a foamed resin 80 is placed in the hollow portion 65. By filling, further strength improvement can be aimed at.

  By the way, the vehicle body front structure of the present invention has been described by taking the first to fifth embodiments as examples. However, the present invention is not limited to these embodiments, and various other embodiments are adopted without departing from the gist of the present invention. can do.

It is a disassembled perspective view of the principal part structure of the vehicle body front part in 1st Embodiment of this invention. It is a schematic front view which shows the effect | action of the vehicle body front part structure with respect to the vertical input load in 1st Embodiment of this invention in the case of this embodiment of (a), and the conventional case of (b). It is a schematic side view which shows the effect | action of the vehicle body front part structure with respect to the vertical input load in 1st Embodiment of this invention in the case of this embodiment of (a), and the conventional case of (b). It is a schematic side view which shows the effect | action of the vehicle body front part structure with respect to the front-back input load in 1st Embodiment of this invention in the case of this embodiment of (a), and the conventional case of (b). It is a perspective view of the principal part structure of the vehicle body front part in 2nd Embodiment of this invention. It is an expanded sectional view along the AA line in FIG. It is the disassembled perspective view which expanded the B section in FIG. FIG. 6 is an enlarged sectional view taken along the line CC in FIG. 5. It is an expanded sectional view corresponding to the AA line in FIG. 5 which shows 3rd Embodiment of this invention. It is a perspective view of the joint part of the front pillar and front roof rail in 4th Embodiment of this invention. It is an expanded sectional view along the DD line in FIG. It is a perspective view of the inclined pillar part in 5th Embodiment of this invention. It is an expanded sectional perspective view along the EE line in FIG. It is an expanded sectional perspective view corresponding to the EE line in FIG. 12 which shows the modification of 5th Embodiment of this invention. It is an expanded sectional perspective view showing the modification of a 5th embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hood ridge member 20 Front pillar 20a Pillar upper end 30 Front roof rail 40 Roof side rail 60 Inclined pillar 60a Lower connecting part of inclined pillar 60b Upper connecting part of inclined pillar 70 Center pillar 80 Foam resin (reinforcing member)
81, 82, 83 Hat-shaped cross-section members (reinforcing members)
R Roof part T Truss structure F1 Vertical input load F2 Front and rear input load

Claims (10)

A hood ridge member extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the front portion of the vehicle body,
A substantially vertical front pillar that is connected to the rear end of the vehicle body of each hood ridge member and is erected in the vertical direction of the vehicle body,
A front roof rail connected across the upper end of each front pillar and extending in the vehicle width direction;
A roof side rail connected to the upper end of each front pillar and extending rearward of the vehicle body;
A vehicle body front structure comprising: a front pillar upper end portion in which the front pillar, the front roof rail, and the roof side rail are assembled; and an inclined pillar that is connected across the front portion of the hood ridge member. .   The vehicle body front part structure according to claim 1, wherein an inclined pillar is disposed offset in the vehicle width direction with respect to a substantially upper half portion above a connecting portion of the front pillar with the hood ridge member. .   The vehicle body front part structure according to claim 1, wherein a member constituting the inclined pillar forms part of the front pillar and the front roof rail.   The vertical load that is input to the roof is supported by the axial reaction force of the front pillar and the center pillar that is erected in the vertical direction of the vehicle body at the rear of the vehicle with the roof side rail as a load receiving member. The vehicle body front part structure according to any one of claims 1 to 3.   The vehicle body front part structure according to any one of claims 1 to 4, wherein a truss structure is formed between the inclined pillar, the hood ridge member, and the front pillar.   The vehicle body front part structure according to any one of claims 1 to 5, further comprising a reinforcing member continuous across the inside of the front pillar and the inside of the front roof rail.   The vehicle body front part structure according to claim 6, wherein the reinforcing member is a foam member.   The vehicle body front part structure according to claim 6, wherein the reinforcing member is a hat-shaped cross-sectional member that forms a hollow portion inside the front pillar and inside the front roof rail.   The vehicle body front part structure according to claim 8, wherein a foaming member is filled in a hollow portion formed by a hat-shaped cross-sectional member. The vehicle body front part structure according to any one of claims 1 to 9, wherein the inclined pillar is formed in a closed cross section, and a foam member is filled in the closed cross section.

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