JP5513904B2 - Front body structure of the vehicle - Google Patents

Description

  The present invention relates to a front vehicle body of a vehicle having a front side frame that is disposed on the left and right sides of the engine room of the vehicle and extends rearward of the vehicle and has a rear side portion connected to a toe board that separates the engine room and the vehicle compartment. Concerning structure.

  In a front body structure of a vehicle such as an automobile, front side frames are disposed on the left and right sides of the engine room. A front side frame extending rearward of the vehicle is connected to a toe board that separates the engine room and the passenger compartment at the rear end portion, and a floor frame that constitutes the floor of the passenger compartment (see Patent Document 1). ).

  The front side frame is required to have high rigidity from the viewpoint of vehicle maneuverability. For example, when the suspension is supported on the front side frame, it is necessary to sufficiently increase the rigidity in the vicinity of the suspension support portion. On the other hand, the front side frame is required to have a characteristic capable of absorbing the energy of the collision and protecting the passenger compartment from the impact when a large collision load is applied from the front. Therefore, the front side frame has a certain level of resistance against a light load from the front. For a large load, the front side frame is crushed in the axial direction to absorb the collision load, and the collision load is It is necessary to have a configuration that is distributed to each other.

  By the way, the stress due to the collision load tends to concentrate near the rear end of the front side frame connected to the toe board. If the vicinity of the rear end deforms before the front side frame is crushed in the axial direction, Or the collision load cannot be efficiently distributed to the floor frame side.

  Therefore, in the prior art disclosed in Patent Document 2, the front side frame is divided into a front frame and a rear frame in the vicinity of the toe board, and the front frame and the rear frame are overlapped and joined to each other. It is configured to ensure the strength of the frame.

JP 2007-326578 A JP 2005-153799 A

  In this case, in order to secure the strength of the front side frame in the vicinity of the toe board, the front frame and the rear frame are overlapped, and there is a concern that the portion becomes thick and the weight increases. Also, in consideration of the overlapping portion, at least one of the front frame and the rear frame must be configured longer than when not overlapping. An increase in weight leads to a reduction in fuel consumption of the vehicle. In addition, when the frame is configured to be long, the weight is increased and the cost is increased.

  The present invention has been made in order to solve the above-described problems, and has a lightweight and simple structure, which can efficiently absorb a collision load and can efficiently disperse the collision load. An object is to provide a vehicle body structure.

A vehicle front body structure according to the present invention includes a front vehicle body structure having a front side frame that is disposed on the left and right sides of a vehicle engine room and extends rearward of the vehicle. A reinforcing member that reinforces the vicinity of the rear end portion is disposed in the vicinity of the rear end portion of the front side frame to which the toe board to be separated is connected, and the phosphorus hose toe board that reinforces the toe board is disposed on the front side frame. Connected to the side surface in the vicinity of the rear end portion, a weakened portion is formed in the front side of the vehicle relative to the reinforcing member of the front side frame , and one end of the phosphorus hose toe board is connected to the front side frame. A phosphorus hose toeboard center whose other end is connected to the toeboard, and one end to the front side frame And a front end of the phosphorus hose toeboard center and the front of the phosphorus hose toeboard lower, which are connected to a side sill disposed on the vehicle cabin side, the front surface of the reinforcing member mounted to the frame, characterized by Rukoto is arranged so as to be substantially flush.

  In the front body structure of the vehicle, a floor frame side disposed on a floor of the passenger compartment is connected to the vicinity of the rear end portion of the front side frame.

  In the front body structure of the vehicle, a bracket that supports a suspension is attached to the floor frame side, and an end portion of the bracket is connected to the vicinity of the rear end portion of the front side frame. .

  In the front body structure of the vehicle, the reinforcing member is a reinforcing plate having a surface substantially orthogonal to the axis of the front side frame and supporting the vicinity of the rear end portion of the front side frame. To do.

  In the front body structure of the vehicle, the fragile portion is a recess formed on an engine room side of the front side frame.

In the front vehicle body structure of the vehicle of the present invention, the reinforcing member is disposed so that the vicinity of the rear end portion of the front side frame connected to the toe board is substantially flush with the front surfaces of the phosphorus hose toe board center and the phosphorus hose toe board lower. By providing a weak portion that collapses when a collision load exceeding a predetermined level is applied at a predetermined location in front of the vehicle rather than the reinforcement position by the reinforcing member, the collision load can be efficiently achieved with a lightweight and simple structure. And the impact load can be dispersed efficiently.

It is a perspective view of the front body structure of this embodiment. FIG. 2 is an enlarged perspective view of the vicinity of a rear end portion of the front side frame shown in FIG. It is the expansion perspective view which looked at the rear-end part vicinity of the front side frame shown in FIG. 1 from the vehicle forward lower part. It is a disassembled perspective view of the reinforcement member arrange | positioned by the front side frame and the rear-end part. It is a top view of the front body structure which makes a front side frame a main part. It is a side view of the front body structure which makes a front side frame a main part. It is a top view of the front side frame of the state which buckled by the collision load.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a front vehicle body structure 10 according to the present embodiment. In the figure, an arrow F indicates the front of the vehicle body.

  In FIG. 1, the front body structure 10 is divided into a portion that forms a vehicle compartment R and a portion that forms an engine room E, and a toe board 12 is disposed therebetween. The toe board 12 includes a toe board center 14 and toe board sides 16a and 16b connected to both left and right sides.

  The portion that forms the passenger compartment R includes a tunnel portion 18, and floor frame sides 19a and 19b and side sills 20a and 20b are disposed on the left and right sides thereof.

  A portion forming the engine room E includes front side frames 24a and 24b extending to the front of the vehicle body, with toeboard sides 16a and 16b connected to the upper portion of the rear end. A phosphorus hose toeboard center 26a, 26b for reinforcing the toeboard center 14 is connected to the inside of the rear ends of the front side frames 24a, 24b. The hose toe board lowers 28a and 28b are connected. Moreover, each edge part of the floor frame side 19a, 19b which comprises the part of the compartment R is connected with the lower part of the rear-end part of front side frame 24a, 24b.

  Further, above the front side frames 24a and 24b, upper frames 31a and 31b having rear ends connected to the front pillars 22a and 22b and extending forward are provided. Further, wheel aprons 30a and 30b that surround the left and right wheel housings Ha and Hb are connected to the sides of the front side frames 24a and 24b.

  Brackets 32a and 32b for supporting the suspension are connected to lower portions of the floor frame sides 19a and 19b on the front side frames 24a and 24b side, and one end portions of the lower members 34a and 34b are connected to the brackets 32a and 32b. Intermediate portions of the front side frames 24a and 24b are connected by a cross member 36 formed in a substantially U-shape for supporting an engine, a transmission, and the like housed in the engine room E. The cross member 36 is reinforced by connecting the other end portions of the lower members 34a and 34b.

  The rear end portions of the crash boxes 38a and 38b are connected to the front end portions of the front side frames 24a and 24b, and the bumper beam 40 is connected to the front end portions of the crash boxes 38a and 38b. When a collision load is applied from the outside through the bumper beam 40, the crash boxes 38a and 38b are crushed and absorb a part of the collision load.

  A cross member upper 42 is connected between the front end portions of the upper frames 31a and 31b. Further, brackets 44a and 44b are connected to the lower portions of the front end portions of the front side frames 24a and 24b, and a cross member lower 46 is connected between the brackets 44a and 44b. The intermediate portions of the cross member upper 42 and the cross member lower 46 are connected by a phosphorus hose member 48. The cross member upper 42 and the cross member lower 46 mainly support the radiator.

  Next, the structure in the vicinity of the rear end portions of the front side frames 24a and 24b will be described in detail with reference to FIGS. In the following description, the structure on the front side frame 24b side will be described. Since the structure on the front side frame 24a side is configured in the same manner as the front side frame 24b, description thereof will be omitted. 2 is an enlarged perspective view of the vicinity of the rear end portion of the front side frame 24b as viewed from the upper front of the vehicle, and FIG. 3 is an enlarged perspective view of the vicinity of the rear end portion of the front side frame 24b as viewed from the lower front of the vehicle. FIG. 4 is an exploded perspective view of a reinforcing member disposed at a front side frame and a rear end portion thereof.

  As shown in FIG. 4, the front side frame 24 b includes an inner plate member 25 having a substantially U-shaped cross section and an outer plate member 29 joined to upper and lower flange portions 27 a and 27 b of the inner plate member 25. It is a hollow prismatic member configured.

  As shown in FIG. 1, a toe board side 16b constituting the toe board 12 is connected to the upper part of the rear end portion of the front side frame 24b. A phosphorus hose toeboard center 26b is connected to the inside of the rear end portion of the front side frame 24b. As shown in FIG. 3, the rear end portion of the front side frame 24b is connected to the end portion of the floor frame side 19b that curves upward. Further, a phosphorus hose toe board lower 28b is connected to the outside of the rear end portion of the front side frame 24b and in the vicinity of the portion to which the floor frame side 19b is connected. The front side frame 24b, the toe board side 16b, the phosphorus hose toe board center 26b, the floor frame side 19b, and the phosphorus hose toe board lower 28b are joined by welding.

  As shown in FIGS. 2 to 4, the front side frame 24 b is provided in the inside of the front side frame 24 b in the vicinity of the end where the phosphorus hose toe board center 26 b, the floor frame side 19 b and the phosphorus hose toe board lower 28 b are connected. A reinforcing plate 50 (reinforcing member) for reinforcement is provided. The reinforcing plate 50 is disposed so that the surface thereof is substantially orthogonal to the axis of the front side frame 24b, thereby restraining the deformation of the front side frame 24b. The reinforcing plate 50 is fixed to the front side frame 24 b by forming a plurality of ear-shaped portions 52 on the outer peripheral portion and welding these ear-shaped portions 52 to the inner plate member 25 and the outer plate member 29. In addition, the reinforcing plate 50 is formed with a lightening portion 54 in order to reduce the weight within a range where necessary strength can be ensured.

  Here, the front end face 26b 'of the phosphorus hose toe board center 26b, the front end face 28b' of the phosphorus hose toe board lower 28b, and the front end face 32b 'of the bracket 32b are connected to the front side frame 24b in FIGS. As shown in FIG. 2, the front plate 50 'of the reinforcing plate 50 is set so as to substantially coincide with the coupling position with respect to the front side frame 24b.

  In the front side frame 24 b, recesses 56 and 58 are formed in the outer wall portion of the inner plate member 25 in the vicinity of the reinforcing plate 50. Therefore, the front side frame 24b is set so that the rigidity in the vicinity of the recesses 56 and 58 (fragile part) is more fragile than the vicinity of the reinforcing plate 50. Moreover, since the recessed parts 56 and 58 are formed inside the vehicle, when a collision load is applied to the front side frame 24b from the front of the vehicle, the concave portions 56 and 58 are configured to buckle outside the vehicle.

  The front vehicle body structure 10 of the present embodiment is basically configured as described above. Next, an effect is demonstrated based on FIGS. 5 is a plan view of the front vehicle body structure 10 having the front side frame 24b as a main part, FIG. 6 is a side view of the front vehicle body structure 10 having the front side frame 24b as a main part, and FIG. It is a top view of the front side frames 24a and 24b of the state which buckled by.

  When a collision load is applied to the bumper beam 40 (FIG. 1) from the front of the vehicle, the bumper beam 40 is displaced to the rear of the vehicle and applies a compressive load to the crash boxes 38a and 38b. In this case, when the collision load is small, most of the collision load is absorbed by crushing the crash boxes 38a and 38b, so that the engine room E is unlikely to be damaged.

  On the other hand, when the collision load is large, the load that is not absorbed by the crushing of the crash boxes 38a and 38b is applied to the front side frames 24a and 24b. The front side frames 24a and 24b that have received the collision load are configured to divide a part of the energy of the collision with the phosphorus hose toeboard centers 26a and 26b, the phosphorus hose toeboard lowers 28a and 28b, and the floor frame side 19a, Disperse backward through 19b.

  When a larger collision load is applied to the bumper beam 40, the front side frames 24a and 24b are formed in the vicinity of the rear end portion and ahead of the portion where the phosphorus hose toe board centers 26a and 26b are connected. The collision energy is absorbed by buckling in the recessed portions 56 and 58 (FIG. 7).

  That is, as shown in FIGS. 5 to 7, phosphorus hose toeboard centers 26a and 26b are connected to the vicinity of the rear ends of the front side frames 24a and 24b, and the reinforcing plate 50 is provided in the vicinity of the rear ends. Since it is mounted, sufficient strength is secured by these. Further, phosphorus hose toeboard lowers 28a and 28b are connected to the vicinity of the rear ends of the front side frames 24a and 24b, and the reinforcing plate 50 is mounted inside the vicinity of the rear ends. Strength is secured. Further, the floor frame sides 19a and 19b are connected to the vicinity of the rear end portions of the front side frames 24a and 24b, and the reinforcing plate 50 is mounted inside the vicinity of the rear end portions. Is secured.

  Furthermore, the joining position of the front end faces 26a 'and 26b' of the phosphorus hose toeboard centers 26a and 26b and the joining position of the front face 50 'of the reinforcing plate 50 are substantially coincident with the front side frames 24a and 24b. Is set. The connecting positions of the front end faces 28a 'and 28b' of the phosphorus hose toeboard lowers 28a and 28b and the connecting position of the front face 50 'of the reinforcing plate 50 are set so as to substantially coincide with the front side frames 24a and 24b. Has been. Further, the coupling position of the front end faces 32a 'and 32b' of the brackets 32a and 32b attached to the floor frame sides 19a and 19b and the coupling position of the front surface 50 'of the reinforcing plate 50 are relative to the front side frames 24a and 24b. Are set to almost match. As a result, higher strength is obtained in the vicinity of the rear ends of the front side frames 24a and 24b. Reference numerals 26a ', 28a', and 32a 'represent front end surfaces of the phosphorus hose toe board center 26a, the phosphorus hose toe board lower 28a, and the bracket 32a that are coupled to the front side frame 24a, although not shown.

  Further, the front surfaces of the phosphorus hose toeboard centers 26a and 26b and the phosphorus hose toeboard lowers 28a and 28b and the front surface 50 'of the reinforcing plate 50 are arranged so as to be substantially flush with each other. Since the resistance force of the side frames 24a and 24b is increased, the rigidity in the vicinity of the rear ends of the front side frames 24a and 24b can be further increased.

  Therefore, the rear end portions of the front side frames 24a and 24b are not deformed by the collision load, and the front side frames 24a and 24b are surely buckled in the vicinity of the concave portions 56 and 58, and sufficiently absorb the energy of the collision. be able to.

  Moreover, since the recessed parts 56 and 58 are formed in the engine room E side of the front side frames 24a and 24b, the buckled front side frames 24a and 24b do not go to the vehicle interior R side, and the outside of the vehicle Will be bent. As a result, the safety of the passenger compartment R is ensured.

  Here, the reinforcing structure of the rear end portions of the front side frames 24a, 24b is a structure in which the reinforcing plate 50 is simply disposed inside the front side frames 24a, 24b. There is almost no impact. Further, since it is not necessary to use a special shape in order to improve the rigidity of the front side frames 24a and 24b, there is no concern about an increase in cost.

  In addition, this invention is not limited to embodiment mentioned above, It is possible to change in the range which does not deviate from the main point of this invention.

  For example, instead of the reinforcing plate 50, ribs integrally provided on the inner peripheral surfaces of the front side frames 24a and 24b may be used as the reinforcing member. Moreover, the weak part formed in the front side frames 24a and 24b can be provided with a work opening or a reduction opening in the part instead of the recesses 56 and 58, or can be configured as a material having low rigidity.

DESCRIPTION OF SYMBOLS 10 ... Front body structure 12 ... Toe board 14 ... Toe board center 16a, 16b ... Toe board side 19a, 19b ... Floor frame side 20a, 20b ... Side sill 24a, 24b ... Front side frame 26a, 26b ... Lynn hose toe board center 28a, 28b ... Lynn hose toe board lower 32a, 32b ... Brackets 38a, 38b ... Crash box 40 ... Bumper beam 50 ... Reinforcing plates 56, 58 ... Recess

Claims (5)

In the front body structure of a vehicle having a front side frame disposed on the left and right of the engine room of the vehicle and extending rearward of the vehicle,
A phosphorus hose that reinforces the toe board by disposing a reinforcing member that reinforces the vicinity of the rear end part in the vicinity of the rear end part of the front side frame to which a toe board that separates the engine room and the vehicle compartment is connected. A toe board is connected to a side surface in the vicinity of the rear end portion of the front side frame, and a fragile portion is formed in a portion of the front side frame on the front side of the vehicle ,
The phosphorus hose toe board has one end connected to the front side frame, the other end connected to the toe board, a phosphorus hose toe board center, one end connected to the front side frame, and the other end connected to the front side frame. Consists of a phosphorus hose toe board lower connected to a side sill disposed on the passenger compartment side,
The front of the vehicle front of the phosphorus Horst over board center and the phosphoric Horst over board lower, the front and of the reinforcing member to be attached to the front side frame of the vehicle, characterized in Rukoto disposed so as to be substantially flush Front car body structure. In the vehicle front body structure according to claim 1,
A front body structure of a vehicle, wherein a floor frame side disposed on a floor of the passenger compartment is connected to the vicinity of the rear end portion of the front side frame. In the vehicle front body structure according to claim 2,
A front vehicle body structure for a vehicle, wherein a bracket for supporting a suspension is attached to the floor frame side, and an end portion of the bracket is connected to the vicinity of the rear end portion of the front side frame. In the vehicle front body structure according to any one of claims 1 to 3,
The vehicle front body structure according to claim 1, wherein the reinforcing member is a reinforcing plate having a surface substantially orthogonal to an axis of the front side frame and supporting the vicinity of the rear end portion of the front side frame. In the front body structure of the vehicle according to any one of claims 1 to 4,
The vehicle body structure of a front part of a vehicle, wherein the weak part is a concave part formed on an engine room side of the front side frame.

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