JP2005067347A - Vehicle body front part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front part structure which efficiently transmits a barrier load at the time of a front collision to a rocker, improving energy absorbing performance at the time of the front collision, and to reduce reinforcing of a kick part of a front side member. <P>SOLUTION: A block-shaped load transmission member 26 is mounted at the outside of a front end part of the front side member 14. A front end part of the load transmission member 26 is formed into a tapered shape and is arranged on front sides of front wheels 12. A front end part of the rocker 18 is arranged on rear sides of the front wheels 12. Barrier load at the time of the front collision therefore can be transmitted to the load transmission member 26, the front wheels 12 and the rocker 18 in the order. By forming the front end part of the load transmission member 26 into the tapered shape, a wedge effect is obtained to prevent floating of a front end part of a vehicle body front part 10. As a result, moment generated in a kick part 14A of the front side member 14 is suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention includes a pair of left and right front side members that are disposed on the inner side of a front wheel at a front part of a vehicle body with a longitudinal direction in the longitudinal direction of the vehicle body and that have a kick portion that bends downward in the vehicle body at a middle portion in the longitudinal direction. The present invention relates to a vehicle body front structure that is applied to a vehicle body that includes a pair of left and right rockers disposed on the side and a lower edge side of a side door with the vehicle body longitudinal direction as a longitudinal direction.

  In general, a pair of long front side members whose longitudinal direction is the longitudinal direction of the vehicle body are arranged in parallel inside the front wheel at the front portion of the vehicle body. On the cabin side, a pair of long rockers having a longitudinal direction in the longitudinal direction of the vehicle body is disposed in parallel on the lower edge side of the side door. However, since the front side member and the rocker are offset from each other in the vehicle body width direction, the barrier load (collision load) is not smoothly transmitted from the front side member to the rocker when the vehicle collides frontward. For this reason, there was a problem that the load burden of the upper member of the front side member becomes large.

  In addition, when the vehicle collides front, the front end of the front part of the vehicle body may be lifted by the barrier. In this case, the desired energy absorption effect cannot be obtained with the upper member of the front side member, and a relatively large moment is generated in the kick portion of the front side member, which requires a lot of reinforcement in the kick portion. There was a problem.

  As a result of investigating prior art documents from the viewpoint of technology capable of solving these problems, Patent Document 1 below was extracted. Briefly, according to the technique disclosed in this publication, the front end portions of a pair of left and right side sills are connected to each other by a dashboard lower member, and a pair of left and right sides are disposed inside both end portions of the dashboard lower member. The rear end of the front side member is joined. Further, a bumper beam having a longitudinal direction in the vehicle body width direction is stretched over the front end portions of the pair of left and right front side members, and a crushable member is disposed on the inner side of both end portions of the bumper beam. A front plate facing the front surface of the front wheel tire is coupled to the rear end portion of the crashable member, and a rear plate facing the rear surface of the front wheel tire is also coupled to the front end portion of the side sill. ing.

According to the above configuration, when the vehicle collides front, the front end portions of the pair of front side members are crushed by the barrier load (collision load) at that time, and the bumper beam is displaced to the rear side of the vehicle body accordingly. When the bumper beam is displaced to the rear side of the vehicle body, the front plate comes into contact with the front surface of the tire of the front wheel via the crushable member and presses the tire to the rear side of the vehicle body. For this reason, the rear surface of the front tire is in contact with the rear plate. As a result, the barrier load is transmitted to the side sill via the tire, and predetermined energy absorption is performed.
JP-A-6-16154

  However, in the case of the above configuration, the first problem described above seems to be effective, but the second problem is still not solved. That is, even if the above prior art is used, the lifting phenomenon of the front end of the front part of the vehicle body at the time of a frontal collision cannot be eliminated, the energy absorption effect by the upper member of the front side member is not improved, and the reinforcement to the kick part is also reduced. It is not possible.

  In consideration of the above facts, the present invention can efficiently transmit the barrier load at the time of a frontal collision to the rocker, and improve the energy absorption performance at the time of the frontal collision and reduce the reinforcement of the kick portion of the front side member. It is an object to obtain a vehicle body front structure that can be used.

  The vehicle body front structure according to the first aspect of the present invention includes a kick portion that is disposed on the inner side of the front wheel at the front portion of the vehicle body with the vehicle body front-rear direction as a longitudinal direction and is bent toward the vehicle body lower side in the middle portion of the longitudinal direction A vehicle body front portion applied to a vehicle body including a pair of left and right front side members, and a pair of left and right rockers disposed on the rear side of the front wheel and on the lower edge side of the side door with the vehicle body longitudinal direction as the longitudinal direction. A barrier load transmitting member that is disposed outside the front side member and on the front side of the front wheel and that transmits a barrier load that acts upon a frontal collision to the front wheel, and is provided in the vicinity of the front end portion of the vehicle body front portion. And a lifting prevention means for preventing the front part of the vehicle body from lifting at the time of a frontal collision.

  According to a second aspect of the present invention, the vehicle body front portion structure according to the first aspect of the invention is characterized in that, in the first aspect of the invention, the lifting prevention means is integrally added to the barrier load transmission member.

  According to a third aspect of the present invention, in the vehicle body front portion structure according to the first or second aspect, the barrier load transmitting means is attached to the outside of the front end portion of the front side member. It is characterized by.

  According to a fourth aspect of the present invention, in the vehicle body front portion structure according to any one of the first to third aspects, the barrier load transmission means is formed in a block shape, and the lift prevention means is It is characterized by comprising a taper portion provided at the front end portion of the barrier load transmission means.

  According to the first aspect of the present invention, since the barrier load transmission member is disposed outside the front side member and on the front side of the front wheel, the barrier load is input to the barrier load transmission member when a frontal collision occurs, and then the barrier load transmission member The load transmitting member is in contact with the front portion of the front wheel, and the rear portion of the front wheel is in contact with the front end portion of the rocker. Therefore, the barrier load at the time of a frontal collision flows smoothly in the order of the barrier load transmission member, the front wheel, and the rocker. As a result, the load burden on the portion located in front of the kick portion of the front side member is reduced.

  In addition, according to the present invention, since the lifting prevention means is provided in the vicinity of the front end portion of the front portion of the vehicle body, the lifting of the front portion of the vehicle body is prevented during a frontal collision. For this reason, even if the kick part is provided in the middle part of the front side member, the intended energy absorption effect can be obtained in the part ahead of the kick part of the front side member. Furthermore, since it is possible to prevent a relatively large moment from being generated in the kick portion of the front side member, reinforcement to the kick portion can be reduced.

  According to the second aspect of the present invention, since the lifting prevention means is integrally added to the barrier load transmission member, the number of parts can be reduced as compared with the case where both are configured independently.

  According to the third aspect of the present invention, since the barrier load transmitting means is attached to the outside of the front end portion of the front side member, the front end portion of the front side member is first compressed and plastically deformed when a frontal collision occurs. Absorption is done. Subsequently, when the energy absorption stroke of the front end portion of the front side member reaches a predetermined value, the barrier load transmission means comes into contact with the front portion of the front wheel, and the rear portion of the front wheel comes into contact with the front end portion of the rocker. As a result, the barrier load at the time of a frontal collision flows smoothly in the order of the barrier load transmission member, the front wheel, and the rocker.

  Moreover, in the present invention, since the barrier load transmission means is attached to the outside of the front end portion of the front side member, it is not necessary to set a new member for mounting the barrier load transmission means, and the existing member is effectively used. can do. In addition, the barrier load transmission means can be well placed and installed in the front part of the vehicle body.

  According to the fourth aspect of the present invention, the barrier load transmission means is formed in a block shape, and the lift prevention means is constituted by a tapered portion provided at the front end portion of the barrier load transmission means. Sometimes the taper is inserted under the barrier. Therefore, it is possible to reliably prevent the front end portion of the front portion of the vehicle body from being lifted during a frontal collision.

  As described above, the vehicle body front structure according to the first aspect of the present invention is arranged outside the front side member and on the front side of the front wheel, and transmits the barrier load acting at the time of frontal collision to the front wheel. Since it has a transmission member and a lift prevention means that is provided near the front end of the front part of the vehicle body and prevents the front part of the vehicle body from lifting when a frontal collision occurs, the barrier load at the time of the frontal collision can be efficiently transmitted to the rocker. And it has the outstanding effect that improvement of the energy absorption performance at the time of a frontal collision and reduction of reinforcement of the kick part of a front side member can be aimed at.

  The vehicle body front part structure according to the present invention as defined in claim 2 is the invention according to claim 1, wherein the lifting prevention means is integrally added to the barrier load transmission member, so that both are configured independently. The number of parts can be reduced, and as a result, there is an excellent effect that reduction in size and weight and cost reduction can be achieved.

  The vehicle body front structure according to the third aspect of the present invention is the vehicle body front structure according to the first or second aspect, wherein the barrier load transmitting means is attached to the outside of the front end portion of the front side member. It has an excellent effect that it is possible to achieve cost reduction by utilizing and securing good vehicle mountability.

  According to a fourth aspect of the present invention, there is provided a vehicle body front portion structure according to any one of the first to third aspects, wherein the barrier load transmission means is formed in a block shape, and the front end portion of the barrier load transmission means is formed. Since the lift prevention means is configured by the taper provided on the front, the front end of the front part of the vehicle body can be reliably prevented from rising at the time of frontal collision, and as a result, barrier load is transmitted to the rocker at the time of frontal collision. It has the outstanding effect that efficiency can be improved further.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR appropriately attached to these drawings indicates the vehicle body front side, an arrow UP indicates the vehicle body upper side, and an arrow OUT indicates the vehicle body width direction outer side.

  FIG. 1 is a plan view of the main part of the vehicle body front structure according to the present embodiment. 2 and 3 show side views of the state before and after the frontal collision when the vehicle body front structure according to this embodiment is applied. Further, FIG. 4 shows a perspective view of a main part of the vehicle body front part structure according to the present embodiment.

  As shown in these drawings, a pair of left and right front side members 14 whose longitudinal direction is the longitudinal direction of the vehicle body are disposed in parallel inside the front wheel 12 in the vehicle body front portion 10. On the other hand, a pair of left and right rockers 18 whose longitudinal direction is the longitudinal direction of the vehicle body are disposed in parallel at the rear side of the front wheel 12 and at the end of the vehicle body floor 16 in the vehicle body width direction (the lower edge side of the side door not shown). ing. Both the front side member 14 and the rocker 18 have a closed cross-sectional structure, and the former is arranged offset by a predetermined distance inward in the vehicle body width direction with respect to the latter.

  Further, as shown in FIG. 2, a kick portion 14 </ b> A that bends toward the vehicle lower side is formed in the middle portion of the front side member 14 in the longitudinal direction (position near the rear end of the front wheel 12). The front side member 14 is divided into an upper portion 14B and a lower portion 14C with a kick portion 14A as a boundary. The upper portion 14 </ b> B extends to the vicinity of the vertical column 20 </ b> A of the radiator support 20 through the inner upper portion of the front wheel 12. The radiator support 20 has a substantially rectangular frame shape, and is disposed inside the front bumper 22. On the other hand, the lower portion 14C is bent and suspended from the kick portion 14A, and then extends from the vicinity of the lower edge of the front fender panel 24 to the vehicle body floor 16 side.

  Here, a block-shaped load transmission member 26 as a “barrier load transmission member” is disposed outside the front end portion of the front side member 14 described above. Specifically, as shown in FIG. 4, the load transmission member 26 includes a trapezoidal block-shaped main body portion 26 </ b> A and a plate-like attachment portion 26 </ b> B provided inside the main body portion 26 </ b> A. The upper edge portion of the attachment portion 26 </ b> B is fixed to the outer surface of the front end portion of the front side member 14 with a bolt 28. Further, the front edge portion of the attachment portion 26 </ b> B is fixed to the outer surface of the vertical column 20 </ b> A of the radiator support 20 with a bolt 28.

  The load transmission member 26 having the above-described configuration is disposed on the front side of the front wheel 12 in a plan view, and is disposed so as to face the rocker 18 with the front wheel 12 interposed therebetween. In other words, when viewed from either a plan view or a side view, the load transmission member 26 is arranged so that the rocker 18, the front wheel 12, and the load transmission member 26 are arranged in a straight line in the longitudinal direction of the vehicle body. The amount of overhang and the position in the height direction are set.

  Further, a taper portion 30 as “lifting prevention means” is formed at the front end portion of the load transmitting member 26 having the above-described configuration. The inclination angle of the taper portion 30 is set to such an angle that the vehicle body front portion 10 can be prevented from being lifted by being submerged or inserted as a wedge under the barrier 32 (see FIG. 3) at the time of a frontal collision.

  Next, the operation and effect of this embodiment will be described.

  The state shown in FIG. 2 is a state before a frontal collision. In this state, the load transmitting member 26 is disposed in the proximity of the front side of the front wheel 12, and the front end portion of the rocker 18 is disposed in the proximity of the rear side of the front wheel 12. The load transmitting member 26, the front wheel 12, and the rocker 18 are arranged in a straight line in the longitudinal direction of the vehicle body when viewed from either a plan view or a side view.

  When a frontal collision occurs from this state, as shown in FIG. 3, the barrier load F1 at that time is input to the front ends of the pair of left and right front side members 14 via the front bumper 22 (its bumper reinforcement). For this reason, the front end portion of the front side member 14 is compressed and plastically deformed, and the load transmitting member 26 attached to the front end portion is displaced rearward of the vehicle body and comes into contact with the front portion of the front wheel 12. For this reason, the front wheel 12 is displaced rearward of the vehicle body and is brought into contact with the front end portion of the rocker 18. Thereby, the barrier load F1 at the time of a frontal collision flows smoothly and quickly in the order of the load transmission member 26, the front wheel 12, and the rocker 18. Therefore, according to this embodiment, the barrier load F1 at the time of a frontal collision can be efficiently transmitted to the rocker 18. Therefore, as compared with the conventional structure, it is possible to reduce the load burden on the upper portion 14B located in front of the kick portion 14A of the front side member 14.

  In addition, according to this embodiment, since the tapered portion 30 is set at the front end portion of the load transmitting member 26, the tapered portion 30 is quickly inserted into the lower side of the barrier 32 at the time of a frontal collision. As a result, a component force F2 from the barrier 32 to the vehicle lower side is generated in the tapered portion 30, and the load transmitting member 26 is pushed down to the vehicle lower side. Therefore, it is possible to prevent the front end side of the vehicle body front portion 10 from being lifted during a frontal collision. As a result, it is possible to prevent a relatively large moment from being generated in the kick portion 14A of the front side member 14. Thereby, reinforcement with respect to the kick part 14A can be reduced. Further, since the vehicle body front portion 10 can be prevented from being lifted, the intended energy absorption effect can be obtained at the upper portion 14B of the front side member 14.

  Generally speaking, according to the vehicle body front structure according to the present embodiment, the barrier load F1 at the time of the frontal collision can be efficiently transmitted to the rocker 18, and the energy absorption performance of the front side member 14 at the time of the frontal collision is improved. Improvement and reduction of reinforcement of the kick part 14A of the front side member 14 can be aimed at.

  Further, in the vehicle body front structure according to the present embodiment, by providing the tapered portion 30 at the tip of the load transmission member 26, the lifting prevention means is integrally added to the barrier load transmission member. Compared with the case where it does, reduction of a number of parts and reduction of an assembly man-hour can be aimed at. As a result, according to the present embodiment, reduction in size and weight and cost reduction can be achieved.

  Furthermore, in the vehicle body front part structure according to the present embodiment, since the load transmission member 26 is attached to the outside of the front end portion of the front side member, there is no need to set a new member in order to mount the load transmission member 26. These members (the front side member 14 and the radiator support 20) can be used effectively. In addition, the load transmission member 26 can be installed in the vehicle body front portion 10 with good fit. As a result, according to this embodiment, it is possible to achieve cost reduction and good vehicle mountability by effectively utilizing existing members.

  Further, in the vehicle body front portion structure according to the present embodiment, the tapered portion 30 that is inserted below the barrier 32 at the time of a frontal collision and prevents the vehicle body front portion 10 from being lifted at the front end portion of the block-shaped load transmission member 26. Since it is provided, it is possible to reliably prevent the front end portion of the vehicle body front portion 10 from being lifted during a frontal collision. As a result, according to this embodiment, the transmission efficiency of the barrier load to the rocker 18 at the time of a frontal collision can be further increased.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The second embodiment is characterized in that a pair of left and right load transmission members 40 as “barrier load transmission members” are connected to each other by a cross member 42 having a longitudinal direction in the vehicle body width direction. The cross member 42 is an element that is grasped as a “connecting member” that connects the pair of left and right load transmitting members 40 in a broad sense. If there is a corresponding member, it may be used. If there is no existing cross member or a member corresponding to the cross member and a cross member can be newly provided, the cross member may be newly provided.

  According to the above configuration, the load transmitting member 40 only needs to be disposed on the front side of the front wheel 12, that is, the projecting portion from the front side member 14 is not required, and accordingly, the load transmitting member 40 is reduced in size and weight. be able to.

[Supplementary explanation of the embodiment]
In each of the first and second embodiments described above, the barrier load transmission member and the floating prevention means are integrally formed (configured as a single component), but the present invention is not limited thereto, and may be configured separately.

  In the first embodiment described above, the load transmission member 26 is attached to the front side member 14 and the vertical column 20A of the radiator support 20 with the bolt 28. However, the present invention is not limited to this, and the barrier load is applied to other parts. You may take the structure which attaches a transmission member. Furthermore, it is not always necessary to attach the barrier load transmission means to the sheet metal part, and it is possible to adopt a configuration in which the barrier load transmission member is fixed to a resin part such as a bumper cover or a fender liner.

  Furthermore, in each of the first and second embodiments described above, the configuration in which the trapezoidal tapered portion 30 is provided at the front end portion of the load transmitting members 26 and 40 in a side view is not limited thereto, but other shapes are also possible. May be adopted. For example, the front end portion of the barrier load transmission member may be stepped.

  Further, in each of the first and second embodiments described above, a configuration in which the three members of the barrier load transmission members 26 and 40, the front wheel 12, and the rocker 18 are arranged in a straight line in the assembled state is adopted. What is necessary is just the structure by which three parties are arranged on a straight line at the time of transmission. For example, since the taper portion 30 is set at the front end portions of the load transmitting members 26 and 40, the front end portion of the vehicle body front portion 10 is pulled to the vehicle body lower side by the taper portion 30 at the time of a frontal collision. Paying attention to this behavior, the load transmitting members 26 and 40 are set slightly higher than the rocker 18 during assembly, and the front end portion of the vehicle body front portion 10 is slightly lowered to the vehicle body lower side by the taper portion 30 at the time of a frontal collision. Therefore, a configuration may be adopted in which the three parties are arranged in a straight line.

It is a top view which shows the principal part of the vehicle body front part structure which concerns on 1st Embodiment. It is a side view which shows the principal part of the vehicle body front part structure which concerns on 1st Embodiment. It is a side view corresponding to FIG. 2 for demonstrating the effect | action and effect at the time of front collision with a barrier. It is a perspective view which shows the principal part of the vehicle body front part structure shown by FIG. It is a top view corresponding to FIG. 1 which shows the principal part of the vehicle body front part structure concerning 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car body front part 12 Front wheel 14 Front side member 14A Kick part 18 Rocker 26 Load transmission member (barrier load transmission member)
30 Tapered part (lifting prevention means)
32 barrier 40 load transmission member (barrier load transmission member)

Claims (4)

A pair of left and right front side members that have a kick portion that is disposed on the inner side of the front wheel in the front portion of the vehicle body with the longitudinal direction of the vehicle body as a longitudinal direction and that bends downward in the vehicle body in the middle of the longitudinal direction, and a rear side and a side of the front wheel A vehicle body front structure applied to a vehicle body configured to include a pair of left and right rockers disposed on the lower edge side of the door with the vehicle body longitudinal direction as the longitudinal direction,
A barrier load transmitting member that is disposed outside the front side member and on the front side of the front wheel, and transmits a barrier load acting upon a frontal collision to the front wheel;
A lift prevention means provided near the front end of the front part of the vehicle body to prevent the front part of the vehicle body from being lifted during a frontal collision;
The vehicle body front part structure characterized by having. The lifting prevention means is integrally added to the barrier load transmission member.
The vehicle body front part structure according to claim 1. The barrier load transmission means is attached to the outside of the front end portion of the front side member,
The vehicle body front part structure according to claim 1 or 2, wherein The barrier load transmission means is formed in a block shape,
The lifting prevention means is constituted by a tapered portion provided at the front end of the barrier load transmission means.
The vehicle body front part structure according to any one of claims 1 to 3, wherein

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