JP2010116055A - Body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent contact with components in an engine compartment by deforming a side member toward the outer side of a vehicle under a load input in the axial direction of the side member from the vehicle front. <P>SOLUTION: A body front structure has at a side member 1 a slope part 3 which deforms the side member 1 toward the vehicle outside OUT under a load F input to a side member tip part 1A from the vehicle front FR toward the vehicle rear RR, and which is formed in such a manner as to be sloped obliquely backward from the vehicle outside OUT toward the vehicle inside in a plan view. The slope part 3 is a section area enlarged part formed such that a longitudinal section area when the side member 1 is cut in a body-width direction is enlarged from the vehicle front FR toward the vehicle rear RR. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front part structure, and to an input load absorption technique for a side member.

  For example, a joint portion of a side frame in which a first member that crushes an axis and absorbs impact energy at the time of a collision and a second member having a high cross-sectional strength is joined and joined obliquely rearward from the inside of the vehicle body toward the outside of the vehicle body. A vehicle body frame structure that has been tilted by being moved backward has been proposed (see Patent Document 1).

In the technique disclosed in Patent Document 1, a load input in the axial direction of the side frame from the front of the vehicle is transmitted to the inside of the vehicle before the outside of the side frame, and the inside is deformed before the outside. Thus, the impact energy input to the side frame is absorbed.
JP 2007-112212 A

  However, in the technique of Patent Document 1, since the inner side is deformed before the outer side of the side frame, there is a possibility that the side frame may be deformed so that the front end is inclined inward.

  When the front end of the side frame is deformed inward, the bent third frame comes into contact with the components in the engine compartment, and the load transmitted by the contacted components may deform the dash panel and narrow the living room.

  Accordingly, the present invention provides a vehicle body front structure capable of receiving a load input in the axial direction of the side member from the front of the vehicle and deforming the side member to the outside of the vehicle to prevent contact with the components in the engine compartment. provide.

  In the vehicle body front portion structure of the present invention, an inclined portion is provided that receives a load input to the front end portion of the side member from the front of the vehicle toward the rear of the vehicle and deforms the side member to the outside of the vehicle. The inclined portion is formed so as to be inclined obliquely rearward from the vehicle outer side toward the vehicle inner side in a plan view.

  According to the vehicle body front part structure of the present invention, the inclined portion provided on the side member is formed so as to be inclined obliquely rearward from the vehicle outer side toward the vehicle inner side in a plan view, so that the vehicle frontward is directed toward the vehicle rearward. The load input in the axial direction of the side member is transmitted to the outside of the vehicle before the inside of the vehicle of the side member, and the outside is deformed before the inside by receiving the load, Bend to the outside of the vehicle. As a result, according to the present invention, since the side member does not bend inward, contact with the engine compartment internal part can be avoided.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

"Description of the structure of the front part of the car body"
1 is a perspective view showing a front body structure of a left side portion of the vehicle, FIG. 2 is a side view of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 1, and FIG. 5A is an enlarged cross-sectional view taken along the line BB in FIG. 2, FIG. 5B is an enlarged cross-sectional view taken along the line CC in FIG. 2, and FIG. FIG. 6A is a side view of the side member, and FIG. 6B is a plan view of the side member.

  In FIG. 1, the arrow FR indicates the front of the vehicle, the arrow RR indicates the rear of the vehicle, the arrow UPR indicates the upper side of the vehicle, the arrow OUT indicates the outer side of the vehicle, and the arrow IN indicates the inner side of the vehicle.

  In the vehicle body front structure of the present embodiment, as shown in FIGS. 1 to 3, a pair of side members 1 extending in the vehicle longitudinal direction on both sides in the vehicle width direction (only the left side member is shown in FIGS. 1 to 3). The strut housing 2 constituting a part of the engine compartment is fixed to the side member 1.

  As shown in FIGS. 4 to 6, the side member 1 receives a load input to the side member front end 1 </ b> A from the vehicle front FR to the vehicle rear RR, and deforms the side member 1 to the vehicle outer OUT. An inclined portion 3 is provided.

  The inclined portion 3 is formed so as to incline obliquely rearward from the vehicle outer side OUT toward the vehicle inner side IN in a plan view as shown in FIG. 6 (B) in particular. The inclined portion 3 is formed at a portion of the front leg portion 4 and the rear leg portion 5 formed on the strut housing 2 to which the front leg portion 4 is attached. The inclined portion 3 includes a cross-sectional area increasing portion formed so as to increase a vertical cross-sectional area, which is an area in a cross-section when the side member 1 is cut in the vehicle width direction, from the vehicle front FR toward the vehicle rear RR. Has been. When the vertical cross-sectional area is defined by another expression, a cross-sectional area of a vertical plane perpendicular to the side member longitudinal direction (axial direction) is defined as a vertical cross-sectional area.

  The side member 1 has a uniform vertical cross-sectional area from the side member tip 1A to the first part MB1 where the front leg 4 is provided, and a second part MB2 where the front leg 4 behind the side member 1 has a vertical cross-sectional area. The increased cross-sectional area is the increased portion, and the third part MB3 from the rear to the rear end is a uniform vertical cross-sectional area having a larger vertical cross-sectional area than the first part MB1.

  The first part MB1 of the side member 1 is formed as a rectangular column having a rectangular longitudinal cross-sectional shape, and the cross-sectional shape is uniform (the same shape) from the side member tip 1A to the position where the front leg 4 is provided. It is said.

  The second part MB2 of the side member 1 increases the vertical cross-sectional area by increasing the vertical cross-sectional area of the first part MB1 upward of the vehicle. The second part MB2 is the inclined part 3 described above, and is inclined obliquely rearward from the vehicle outer side OUT toward the vehicle inner side IN in a plan view. An inclination start point K1 of the inclined surface 3a of the inclined portion 3 rising from the upper surface 1a of the first part MB1 to the vehicle upper UPR is provided on an outer surface 1b of the vehicle outer side OUT of the side member 1, and an inclination end point. K2 is provided on the inner surface 1c of the vehicle inner side IN of the side member 1.

  The third part MB3 of the side member 1 is a rectangular column having a rectangular shape having the same sectional area as the longitudinal sectional area at the inclination end point K2 of the second part MB2. The third part MB3 is the same quadrangular prism as the first part MB1, but has a larger cross-sectional area than the longitudinal sectional area of the first part MB1.

  As described above, the side members 1 of the present embodiment have different vertical cross-sectional areas in the first part MB1, the second part MB2, and the third part MB3, and an increased cross-sectional area that is the inclined portion 3 of the second part MB2. Differences in the rigidity of members occur at the portions. The effect of providing the inclined portion 3 will be described later.

  On the other hand, the strut housing 2 includes a housing main body 6 constituting a part of an engine compartment for mounting and housing a vehicle body suspension device for suspending a vehicle body, and a front leg portion 4 and a rear leg portion which are attachment portions to the side member 1. 5 and these are integrally formed. The housing body 6 is formed with a strut attachment portion 10 for attaching a strut 9 having a coil 8 attached to a shock absorber 7. The front leg 4 and the rear leg 5 are integrated on both sides of the housing body 6.

  The front leg portion 4 and the rear leg portion 5 have the same shape, are substantially U-shaped in cross section, and are generally L-shaped as a whole. Specifically, the front leg portion 4 and the rear leg portion 5 include front walls 4A and 5A facing the vehicle front FR, rear walls 4B and 5B facing the vehicle rear RR, and a central wall 4C provided therebetween. , 5C, and a substantially U-shaped cross section.

  Leg fixing portions 11 and 12 which are attachment portions to the side member 1 are formed at the front ends of the front leg portion 4 and the rear leg portion 5. The leg fixing portion 11 of the front leg 4 includes a front attachment portion 11A attached to the upper surface 1a of the first part BM1 of the side member 1 and a rear side attached to the upper surface 1d of the third part BM2 of the side member 1. The mounting portion 11 </ b> B and a side surface mounting portion 11 </ b> C attached to the inner side surface 1 c of the side member 1. Since the front attachment portion 11A and the rear attachment portion 11B of the front leg portion 4 are provided with the inclined portion 3 interposed therebetween, a step is generated by the height of the inclined surface 3a of the inclined portion 3.

  On the other hand, each of the leg fixing portions 12 of the rear leg portion 5 includes a front attachment portion 12A and a rear attachment portion 12B that are attached to the upper surface 1d of the third portion MB3 of the side member 1, and an inner surface of the side member 1. And a side surface attaching portion 12C attached to 1c. Since both the front attachment portion 12A and the rear attachment portion 12B of the rear leg portion 5 are attached to the upper surface 1d of the third part MB3, they are at the same height position.

  As shown in FIGS. 1 and 2, the front leg 4 is attached to an inclined portion 3 that is a cross-sectional area increasing portion in which the vertical cross-sectional area of the side member 1 changes. At this time, the front wall lower end edge 4A1 of the front wall 4A facing the vehicle front side of the front leg portion 4 is more than the inclination start point K1 facing the vehicle front end side of the inclined portion 3 as shown in FIGS. 4 and 5C. The front position. Further, as shown in FIGS. 4 and 5B, the rear wall lower edge 4B1 facing the vehicle rear side of the front leg portion 4 is positioned rearward of the inclination end point K2 facing the vehicle rear side of the inclined portion 3. And On the other hand, as shown in FIGS. 1 and 2, the rear leg portion 5 is attached to a third part MB <b> 3 in which the side member 1 has a uniform longitudinal sectional area.

  As shown in FIG. 1, the strut housing 2 is attached with a reinforcement hood ridge 13 constituting a frame member in the longitudinal direction of the vehicle body of the engine compartment and an upper link 14 constituting a part of the vehicle body suspension device. It has been. As shown in FIGS. 1 and 5A, the upper link 14 has its both end portions 14A and 14B fixed to the front leg portion 4 and the rear leg portion 5, respectively. 1 and 2 show only the side member 1 and the strut housing 2 on the left side of the vehicle, the right side of the vehicle has the same structure.

"Description of deformation of side member"
FIG. 7 is an operation diagram continuously showing a series of operations in which the side member bends to the outside of the vehicle in response to a load input in the axial direction of the side member from the front of the vehicle toward the rear of the vehicle. In FIG. 7, the shape of the strut housing 2 is simplified for easy understanding of the shape of the upper link 14.

  In the vehicle body front structure configured as described above, as shown in FIG. 7A, when a load F is input in the member axial direction to the side member front end portion 1A from the vehicle front FR toward the vehicle rear RR, The first part MB1 having a smaller vertical cross-sectional area than the second part MB2 and the third part MB3 of the side member 1 receives the load F and is axially crushed in the side member axial direction and is crushed as shown in FIG. Due to the collapse of the first part MB1 of the side member 1, energy due to the load F is absorbed.

  7B, when the front wheel tire 15 is pushed to the vehicle rear RR by the load F, the upper link 14 connected to the front wheel tire 15 is moved to the vehicle rear RR as shown in FIG. 7C. Dragged to Further, in the strut housing 2 connected to the upper link 14, a force Fh to the vehicle rear RR acts on the front wall 4A of the front leg portion 4. The force Fh input to the front wall 4A is ahead of the inclination end point K2 at the inclination start point K1 of the inclined surface 3a of the inclined portion 3 provided immediately after the vehicle behind the front wall 4A shown in FIG. It is transmitted to.

  Therefore, as shown in FIG. 7C, the external force Fs acting on the vehicle outer side OUT of the side member 1 provided with the inclination start point K1 and the external force Fi acting on the vehicle inner side IN of the side member 1 provided with the inclination end point K2. The force acting between the two members is imbalanced, and a moment Ms for bending the side member 1 to the vehicle outer side OUT is generated. As shown in FIG. 7D, the side member 1 is bent from the portion fixed to the side member 1 of the rear leg 5 to the vehicle outer side OUT by the action of the moment Ms. Become. By bending the side member 1 to the vehicle outer side OUT, the load F input to the side member front end 1A can be absorbed.

  Further, the load input to the strut housing 2 is transmitted along the surface of the rear wall 4B of the front leg 4 in the shearing direction and is transmitted to the side member 1 that is the landing point. Since the fixed portion of the rear wall 4B of the front leg 4 with respect to the side member 1 is a portion having a larger vertical cross-sectional area and higher rigidity than the first portion MB1 and the second portion MB2, vertical input in the vehicle vertical direction The vertical vibration of the side member 1 due to is suppressed.

"Action / Effect"
According to the present embodiment, the side member 1 receives the load F input to the side member front end portion 1A from the vehicle front FR to the vehicle rear OUT, and deforms the side member 1 to the vehicle outer side OUT. 3 is formed so as to be inclined obliquely rearward from the vehicle outer side OUT toward the vehicle inner side IN in plan view, the load F can be transmitted to the vehicle outer side OUT before the vehicle inner side IN of the side member 1. The side member 1 can be bent toward the vehicle outer side OUT by deforming the outer side before the inner side. Therefore, the side member 1 is bent to the vehicle outer side OUT so that contact between the engine compartment internal part and the side member 1 can be avoided.

  In addition, according to the present embodiment, the side member 1 can be bent toward the vehicle outer side OUT, so that it is possible to ensure a shock absorbing stroke input to the side member front end 1A. Thereby, it becomes possible to shorten the vehicle front-back direction length of the side member 1, and can raise a vehicle body modeling freedom degree.

  Further, according to the present embodiment, the rigidity difference at the cross-section changing portion adversely affects the linearity of the torsional rigidity of the vehicle body. However, since the cross-sectional area increasing portion is the inclined portion 3, the sudden rigidity difference is alleviated. It is possible to prevent deterioration in torsional rigidity linearity.

  In addition, according to the present embodiment, the inclined portion 3 includes a cross-sectional area increasing portion formed so as to increase the vertical cross-sectional area when the side member 1 is cut in the vehicle width direction from the vehicle front FR toward the vehicle rear RR. Therefore, it is easy to absorb a small load at the front of the increased cross-sectional area because the vertical cross-sectional area is small compared to the rear, and it is difficult to deform at a small load because the vertical cross-sectional area is larger than the front at the rear. It becomes easy to absorb. Therefore, a small load can be absorbed in front of the side member with the inclined portion 3 as a boundary, and a large load can be absorbed in the rear of the side member. Furthermore, since the cross-sectional area increasing portion is the inclined portion 3, a difference in rigidity occurs between the front and rear sides of the inclined portion 3, and the front side of the side member is deformed to the vehicle outer side OUT and a large load is applied to the bending stress of the side member 1. Can be absorbed by.

  In addition, according to the present embodiment, the front wall lower end edge 4A1 of the front wall 4A facing the vehicle front FR of the front leg portion 4 of the strut housing 2 is more than the inclination start point K1 facing the vehicle front end side of the inclined portion 3. Since the load F input to the front end 1A of the side member is transmitted to the front leg 4 of the strut housing 2, the load is provided in front of the inclination start point K1 of the inclined portion 3 because it is provided at the front. It is possible to transmit the side member 1 from the front lower end edge 4A1 to the inclined portion 3 behind it and further deform the side member 1 to the vehicle outer side OUT.

  Moreover, according to this embodiment, since the said side member 1 bends toward the vehicle outer side OUT from the fixing | fixed part to the said side member 1 of the rear side leg part 5, the engine, electronic components, etc. which are arrange | positioned in an engine compartment, etc. Can be prevented from being damaged by the bent side member 1.

  In addition, according to the present embodiment, the rear wall lower end edge 4B1 of the rear wall 4B facing the vehicle rear RR of the front leg portion 4 is provided behind the inclination end point K2 facing the vehicle rear side of the inclined portion 3, Since the fixed part of the rear wall 4B of the front leg 4 with respect to the side member 1 is a part having a higher rigidity in the longitudinal sectional area than the first part MB1, the vertical vibration of the side member 1 due to vertical input in the vertical direction of the vehicle. Can be reduced.

"Other embodiments"
FIG. 8 is a perspective view showing a vehicle body front portion structure in another embodiment. In the above-described embodiment, the weak part 16 in which the strength of the side member 1 is weaker than other parts is formed between the parts where the front leg part 4 and the rear leg part 5 are fixed to the side member 1. Also good. As the fragile portion 16, for example, as shown in FIG. 8, a slit groove is formed along the height direction on the outer surface 1 b of the side member 1. By providing the weak part 16, it becomes easy to bend from the site | part when the load F is applied, and it becomes possible to control the bending of the side member 1. FIG.

FIG. 1 is a perspective view showing a front body structure of a left side portion of the vehicle. FIG. 2 is a side view of FIG. FIG. 3 is an exploded perspective view of FIG. 4 is an enlarged cross-sectional view taken along the line AA in FIG. 5A is an enlarged cross-sectional view taken along line BB in FIG. 2, FIG. 5B is an enlarged cross-sectional view taken along line CC in FIG. 2, and FIG. 5C is DD in FIG. It is an expanded sectional view in a line position. 6A is a side view of the side member, and FIG. 6B is a plan view of the side member. FIG. 7 is an operation diagram continuously showing a series of operations in which the side member bends to the outside of the vehicle in response to a load input in the axial direction of the side member from the front of the vehicle toward the rear of the vehicle. FIG. 8 is a perspective view showing a vehicle body front portion structure in another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Side member 2 ... Strut housing 3 ... Inclined part 4 ... Front side leg part 5 ... Rear side leg part 11, 12 ... Leg part fixing part 14 ... Upper link 15 ... Front wheel tire 16 ... Fragile part

Claims (6)

A vehicle body front structure having a pair of side members extending in the vehicle longitudinal direction on both sides in the vehicle width direction,
An inclined portion that receives a load input to the tip of the side member from the front of the vehicle toward the rear of the vehicle and deforms the side member toward the outside of the vehicle from the front of the vehicle toward the inside of the vehicle in plan view. A vehicle body front structure characterized in that it is formed to be inclined rearward. The vehicle body front structure according to claim 1,
The inclined portion is a cross-sectional area increasing portion formed so as to increase a vertical cross-sectional area when the side member is cut in a vehicle width direction from the front of the vehicle toward the rear of the vehicle. Construction. The vehicle body front part structure according to claim 1 or 2,
A strut housing that constitutes a part of an engine compartment for mounting and housing a vehicle body suspension device for suspending a vehicle body, and fixing a front leg portion and a rear leg portion of the strut housing to the upper surface of each side member,
A vehicle body front part structure characterized in that a front wall lower end edge of the front leg portion facing the vehicle front is provided in front of a starting point of the inclined portion facing the vehicle front end side. The vehicle body front structure according to claim 3,
The vehicle body front part structure characterized in that the side member bends toward the vehicle outer side from a fixing part of the rear leg to the side member. The vehicle body front part structure according to claim 3 or 4,
A vehicle body front part structure characterized in that a weakened part in which the strength of the side member is weaker than other parts is provided between parts where the front leg part and the rear leg part are fixed to the side member. The vehicle body front part structure according to any one of claims 3 to 5,
A vehicle body front part structure characterized in that a rear wall lower end edge of the front leg portion facing the vehicle rear is provided behind an end point of the inclined portion facing the vehicle rear side.

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