JP2014069601A - Vehicle front car body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately suppress shock loads at the time of collision by preventing scattering of foreign objects from the lower side of a car body.SOLUTION: A front deformation suppression frame 11, a rear deformation suppression frame 12, and a rear part deformation suppression frame 13 serving as deformation suppression frames are integrated with an undercover 15 to be improved in rigidity (resistance) without any increase of weight. The rigidity of the deformation suppression frame itself for absorbing loads is increased by preventing scattering of foreign objects from the lower side of the car body, and deformation of a frame structure at the time of collision is accurately suppressed without increasing the number of deformation suppression frames.

Description

  The present invention relates to a vehicle body structure at a front portion of a vehicle.

  The vehicle body has a structure including a pair of side members extending in the longitudinal direction of the vehicle and a cross member that connects the side members at appropriate locations in the longitudinal direction of the vehicle. The front part of the vehicle body constituting the engine room is constituted by a front side member, a front end cross member, and the like, and members for supporting traveling wheels such as an axle and a torsion bar are provided between the front side members. Then, a radiator, an engine, a transmission, a steering mechanism, a suspension mechanism, and the like are mounted on the front structure of the vehicle body.

  Off-road vehicles such as pickup trucks employ a structure with an under cover on the underside of the frame structure at the front of the vehicle body so that foreign objects such as stones do not enter the engine room from the underside of the vehicle. And it is proposed to absorb the impact load at the time of a vehicle collision by an undercover (see, for example, Patent Document 1).

  By applying an under cover with a structure that absorbs the impact load at the time of vehicle collision, the impact at the time of vehicle collision is suppressed without configuring the front side member, front end cross member, etc. with a special shock absorbing structure. be able to. However, when a structure that absorbs an impact load at the time of a vehicle collision is used by the under cover, it is necessary to design the under cover according to the shock absorbing performance in order to arbitrarily design the shock absorbing performance.

JP 2004-322719 A

  The present invention has been made in view of the above situation, and can prevent foreign matter from scattering from the underside of the vehicle body and entering the engine room, and can accurately suppress the impact load at the time of collision. It aims at providing the body structure of a part.

  In order to achieve the above object, a vehicle body structure of a vehicle front portion according to a first aspect of the present invention is provided with a pair of side members extending in the front-rear direction of the vehicle and a plurality of side members extending in the front-rear direction of the vehicle. A cross member connected in the width direction; at least one end of which is provided in the cross member; a deformation suppression frame that serves as a flange to disperse and suppress a load applied to the side member; and a recess in which the deformation suppression frame is fitted. And an under cover that covers the lower surface of the vehicle integrally with the deformation suppressing frame.

  According to the first aspect of the present invention, the under cover provided with the deformation suppression frame and integrated with the deformation suppression frame prevents foreign objects such as stones from jumping into the engine room from below. Since the deformation suppression frame is integrated with the under cover, the deformation suppression frame can be used to absorb the load with increased rigidity without increasing the weight, and the deformation of the collision can be accurately suppressed. be able to.

  The deformation suppression frame integrated with the under cover is provided at least at one end of the cross member. For example, the deformation suppressing frame is provided across the side member and the cross member or the cross member continuous in the front-rear direction.

  According to a second aspect of the present invention, there is provided a vehicle front body structure according to the present invention, wherein the front end cross member disposed in front of the vehicle is a cross member of the vehicle front body structure according to the first aspect. A deformation suppression cross member that is disposed on the rear lower side of the vehicle of the front end cross member and connects the side members in the vehicle width direction as the deformation suppression frame, the deformation suppression cross member and the under cover The front portion of the vehicle is integrated.

  In the present invention according to claim 2, since the front portion of the under cover of the vehicle is integrated with the deformation suppressing cross member, the front portion of the under cover is disposed on the rear lower side of the front end cross member. The airflow on the lower surface of the under cover on the rear side of the cross member can be rectified to make it difficult to receive air resistance under the floor.

  The vehicle front body structure of the present invention according to claim 3 is the vehicle front body structure according to claim 2, wherein the under cover is integrally provided below the deformation suppressing cross member. The upper surface of the deformation suppressing cross member is provided with an inclined surface.

  In the present invention according to claim 3, since the upper surface of the deformation suppressing cross member is provided with an inclined surface, air is guided into the engine room to guide the cooling air toward the rear of the radiator, the engine, and the transmission. It is possible to reduce the heat radiation amount of the drive transmission device and the like on the rear side of the engine room.

  According to a fourth aspect of the present invention, there is provided a vehicle body structure for a vehicle front portion according to the present invention. The vehicle body structure for a vehicle front portion according to any one of the first to third aspects, wherein the under cover is a front-rear direction of the vehicle. It is divided by.

  In the present invention according to claim 4, even if the under cover is enlarged in a vehicle having many opportunities to travel off-road such as a pickup truck, it is possible to remove only a necessary portion of the divided under cover and cope with maintenance. it can.

  The vehicle body structure of the front portion of the vehicle according to the present invention can prevent foreign matter from scattering from the lower side of the vehicle body and entering the engine room, and can accurately suppress the impact load at the time of collision.

1 is a schematic perspective view of a vehicle body structure at a front portion of a vehicle according to an embodiment of the present invention. 1 is an exploded perspective view of a main part of a vehicle body structure at a front portion of a vehicle according to an embodiment of the present invention. It is a principal part top view of the vehicle body structure of the vehicle front part which concerns on one Example of this invention. It is a principal part bottom view of the vehicle body structure of the vehicle front part which concerns on one Example of this invention. It is the VV arrow directional view in FIG. FIG. 6 is a view taken along line VI-VI in FIG. 3. It is a sectional side view showing the situation of air current. It is a principal part detail drawing in FIG.

  The overall structure of the vehicle body structure at the front portion of the vehicle according to one embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a schematic perspective view of a vehicle body structure at the front of a vehicle according to an embodiment of the present invention, and FIG. 2 shows an exploded perspective view of a frame structure.

  As shown in the figure, a pair of side members 2 extending in the front-rear direction of the vehicle 1 are provided. The pair of side members 2 are connected at the front end in the vehicle width direction by a front end cross member 3, and the pair of side members 2 are front and rear by a second cross member 4, a third cross member 5, and a fourth cross member 6. Are connected in the vehicle width direction at appropriate positions.

  Deformation between the pair of side members 2 and the second cross member 4 and between the third cross member 5 and the fourth cross member 6 to disperse and suppress the load applied to the side member 2 as a heel A suppression frame is provided.

  That is, a front deformation suppression frame 11 is provided between the second cross member 4 and the pair of side members 2, and a rear deformation suppression frame 12 is provided between the third cross member 5 and the fourth cross member 6. Yes. Further, a rear side deformation suppressing frame 13 is provided between the fourth cross member 6 and the pair of side members 2.

  An under cover 15 is disposed below the floor surface of the pair of side members 2 from the front end cross member 3 to the fourth cross member 6. The under cover 15 is divided into a front under cover 16 between the front end cross member 3 and the third cross member 5 and a rear under cover 17 between the third cross member 5 and the fourth cross member 6. Yes. The rear edge of the front under cover 16 and the front edge of the rear under cover 17 are joined to each other by bolts or the like.

  The front under cover 16 is formed with a front groove 21 (see FIG. 4 to be described later) into which the front deformation suppression frame 11 is fitted, and the front under cover 16 and the front deformation suppression frame 11 are formed in the front groove 21 with the front deformation suppression frame. 11 is integrated in a state of fitting (welding, outfitting).

  Further, the rear under cover 17 is formed with a rear groove 22 into which the rear deformation suppression frame 12 is fitted and a rear side groove 23 into which the rear side deformation suppression frame 13 is fitted. The rear under cover 17 and the rear deformation suppression frame 12 are integrated in a state where the rear deformation suppression frame 12 is fitted in the rear groove 22 (welding, outfitting), and the rear under cover 17 and the rear side deformation suppression frame 13 are The rear side groove 23 is integrated with the rear side deformation suppressing frame 13 (welding, outfitting).

  Since the under cover 15 is divided into the front under cover 16 and the rear under cover 17, even if the under cover 15 is enlarged in a vehicle that frequently travels off-road such as a pickup truck, the divided front under cover 16 is divided. Alternatively, by removing one of the rear undercovers 17, it is possible to cope with maintenance without requiring a large work.

  In the above-described vehicle body structure at the front of the vehicle, the under cover 15 integrated with the deformation suppression frame (the front deformation suppression frame 11, the rear deformation suppression frame 12, the rear side deformation suppression frame 13) that becomes a saddle, This prevents foreign objects such as stones from jumping into the engine room. Since the deformation suppression frame is integrated with the under cover 15, it can be a deformation suppression frame for absorbing a load with increased rigidity (increased resistance) without increasing the weight or the like. It is possible to accurately suppress the deformation of the frame structure when there is.

  In the embodiment described above, an example in which the front deformation suppression frame 11, the rear deformation suppression frame 12, and the rear side deformation suppression frame 13 are provided as the deformation suppression frame has been described. However, the front deformation suppression frame 11 and the rear deformation suppression frame are described. Any one of the frame 12 and the rear side deformation suppressing frame 13 may be provided. Further, any two of the front deformation suppression frame 11, the rear deformation suppression frame 12, and the rear side deformation suppression frame 13 can be provided in combination. That is, the deformation suppressing frame according to the present invention is a deformation suppressing frame in which at least one end is provided in any of the cross members 3, 4, 5, 6, and acts as a heel to distribute and suppress the load applied to the side member 2. I just need it.

  The vehicle body structure at the front of the vehicle will be described in detail with reference to FIGS.

  3 is a plan view of the main part when the vehicle body structure is viewed from above, FIG. 4 is a bottom view when the vehicle body structure is viewed from the road surface side, and FIG. 5 is a front view when viewed from the VV line direction in FIG. FIG. 6 shows a side view as seen from the direction of arrows VI-VI in FIG.

  As shown in the figure, the front deformation suppressing frame 11 includes a pair of front frames 25 whose rear end portions are attached to the lower surface of the second cross member 4 and whose front end portions are arranged below the side members 2. . The front end portions of the pair of front frames 25 are connected by a deformation suppression cross member 26 extending in the vehicle width direction, and the end portions of the deformation suppression cross member 26 in the vehicle width direction are respectively attached to the side members 2 via brackets 27. ing. A hook 28 for traction is provided at the tip of the front frame 25.

  The front frame 25 is formed in a closed cross section in which a flat upper plate 25b is joined to a hat-shaped lower plate 25a. Be joined.

  As shown mainly in FIG. 6, the deformation suppressing cross member 26 is disposed on the lower rear side of the front end cross member 3, and the front portion of the front under cover 16 (under cover 15) is integrated with the deformation suppressing cross member 26. Has been. The front under cover 16 is inclined rearward and downward, and a side cover 16a is formed on the side of the front under cover 16 to be joined to the outer side of the side member 2.

  The rear deformation suppression frame 12 includes a pair of rear frames 31. The rear end portions of the pair of rear frames 31 are attached to the lower surface of the fourth cross member 6, and the front end portions of the pair of rear frames 31 are attached to the lower surface of the third cross member 5. The rear frame 31 is formed with a closed cross section in which a flat upper plate 31 b is joined to a hat-shaped lower plate 31 a, and the flat upper plate 31 b is formed on the lower surface of the fourth cross member 6 and the lower surface of the third cross member 5. Be joined.

  The rear side deformation suppressing frame 13 includes a pair of rear side frames 32. The rear end portions of the pair of rear side frames 32 are attached to the lower surface of the fourth cross member 6 outside the rear frame 31 in the vehicle width direction, and the front end portions of the pair of rear side frames 32 are the pair of side members 2. It is attached to the lower surface of each. The rear side frame 32 is formed with a closed cross section in which a flat upper plate 32 b is joined to a hat-shaped lower plate 32 a, and the flat upper plate 32 b is formed on the lower surface of the fourth cross member 6 and the lower surface of the side member 2. Be joined.

  The front edge of the rear under cover 17 is joined to the rear edge of the front under cover 16, and the rear under cover 17 is disposed in a horizontal state toward the rear. A side cover 16 a that is joined to the outer side portion of the side member 2 is formed on the side portion of the front under cover 16.

  In the vehicle body structure at the front of the vehicle described above, the front edge of the front under cover 16 is integrated with the deformation suppressing cross member 26 disposed on the rear lower side of the front end cross member 3, and the front under cover 16 faces rearward. The rear under cover 17 is inclined to the lower side and is arranged in a horizontal state toward the rear. For this reason, the airflow on the lower surface of the under cover 15 on the rear side of the front end cross member 3 is rectified, and the air resistance under the floor can be made difficult to receive (see FIG. 7 described later).

  The state of the airflow at the front of the vehicle will be described with reference to FIGS.

  FIG. 7 shows a side cross section of the vehicle body structure at the front portion of the vehicle for explaining the airflow situation, and FIG. 8 shows a detailed situation of the portion of the deformation suppressing cross member 26.

  As shown in FIG. 7, an engine room 35 is disposed above the front end cross member 3, the second cross member 4, the third cross member 5, and the fourth cross member 6 between the side members 2. A radiator 36, an engine 37, and a transmission (transmission) 38 are accommodated. An under cover 15 is provided at the lower portion of the engine room 35 to prevent foreign matters such as stones from the road surface from scattering into the engine room 35.

  And the airflow of a lower side surface is rectified | straightened according to the inclination condition of the front under cover 16 and the back under cover 17, and it can make it difficult to receive the air resistance under a floor. Thereby, it becomes possible to improve fuel consumption.

  As shown mainly in FIG. 8 (see also FIG. 3 and FIG. 4), the front edge portion of the front under cover 16 is arranged at the position of the front end cross member 3, and the front end cross member 3 and the deformation suppressing cross An opening 16 b is formed in the front under cover 16 located between the members 26.

  As shown mainly in FIG. 8, an inclined surface 39 is formed on the front side of the vehicle 1 on the upper surface of the deformation suppressing cross member 26. When the vehicle 1 travels, the air that flows in from the opening 16 b of the front under cover 16 is guided toward the radiator 36 by the inclined surface 39 of the deformation suppressing cross member 26.

  Since the air flow is guided toward the radiator 36 by the inclined surface 39 of the deformation suppressing cross member 26, the air is guided into the engine room 35 and cooled by the radiator 36, and cooled toward the rear of the radiator 36, the engine 37, and the transmission. Air can be guided. For this reason, the heat radiation amount of the drive transmission device and the like on the rear side of the engine room 35 can be reduced.

  The vehicle body structure of the front part of the vehicle having the above-described configuration is such that a stone or the like is formed from the lower side of the vehicle by the under cover 15 integrated with the front deformation suppression frame 11, the rear deformation suppression frame 12, and the rear side deformation suppression frame 13. Are prevented from jumping into the engine room 35.

  Since the front deformation suppression frame 11, the rear deformation suppression frame 12, and the rear side deformation suppression frame 13 as the deformation suppression frame are integrated with the under cover 15, the rigidity is increased without increasing the weight or the like ( The front deformation suppression frame 11, the rear deformation suppression frame 12, and the rear side deformation suppression frame 13 can be provided.

  Thereby, the deformation of the frame structure when there is a collision can be accurately suppressed without increasing the rigidity of the deformation suppression frame itself for absorbing the load or increasing the deformation suppression frame.

  Therefore, in the vehicle body structure at the front portion of the vehicle having the above-described configuration, it is possible to prevent foreign matter from scattering from the lower side of the vehicle body and entering the engine room 35, and it is possible to accurately suppress the impact load at the time of collision. Become.

  The present invention can be used in the industrial field of a vehicle body structure at the front of a vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Side member 3 Front end cross member 4 2nd cross member 5 3rd cross member 6 4th cross member 11 Front deformation suppression frame 12 Rear deformation suppression frame 13 Rear side part deformation suppression frame 15 Under cover 16 Front under cover 17 Rear under cover 21 Front groove 22 Rear groove 23 Rear side groove 25 Front frame 26 Deformation suppressing cross member 27 Bracket 28 Hook 31 Rear frame 32 Rear side frame 35 Engine room 36 Radiator 37 Engine 38 Transmission (transmission)

Claims (4)

A pair of side members extending in the longitudinal direction of the vehicle;
A plurality of cross members provided in the front-rear direction of the vehicle and connecting the side members in the vehicle width direction;
At least one end is provided on the cross member, and a deformation suppressing frame that suppresses the load applied to the side member as a heel by dispersing,
A vehicle body structure for a front part of a vehicle, comprising a recess into which the deformation suppression frame is fitted, and an under cover that covers the lower surface of the vehicle integrally with the deformation suppression frame. In the vehicle body structure of the vehicle front part according to claim 1,
As the cross member,
A front end cross member disposed in front of the vehicle;
As the deformation suppression frame,
A deformation suppressing cross member arranged on the rear lower side of the vehicle of the front end cross member and connecting the side member in the vehicle width direction;
The vehicle body structure of the front part of the vehicle, wherein the deformation-preventing cross member and the under cover of the vehicle on the front side are integrated. In the vehicle body structure of the vehicle front part according to claim 2,
The under cover is integrally provided on the lower side of the deformation suppressing cross member,
The vehicle body structure of the front part of the vehicle, wherein an upper surface of the deformation suppressing cross member is provided with an inclined surface. In the vehicle body structure of the vehicle front part according to any one of claims 1 to 3,
The vehicle body structure of the front part of the vehicle, wherein the under cover is divided in the front-rear direction of the vehicle.

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