JP6032123B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure that constitutes a vehicle front portion, and more particularly to a vehicle body front portion that takes into account an offset collision with a small overlap amount that is input from the front of the vehicle to a front wheel near the vehicle width direction outside of a side member. Concerning structure.

  Various vehicle body front structures for protecting passengers have been proposed on the assumption that a collision load is input to the vehicle body. For example, in the vehicle body front part structure described in Patent Document 1, an energy absorbing member made of hard foamed urethane is provided on the rear side of the bumper in front of the front wheel, assuming that the opponent vehicle collides from the diagonally front outer side of the vehicle body. An energy absorbing member made of hard foamed urethane is arranged on the front side of the side sill behind the front wheel. When the opponent vehicle collides diagonally from the front outside, the bumper is deformed in the input direction of the collision load, the front wheel hits the front surface of the side sill via the energy absorbing member, and the collision load is transmitted to the side sill. Yes.

  On the other hand, in the vehicle body front part structure of Patent Document 2, assuming that the opponent vehicle collides from the front of the vehicle body, an energy absorbing member made of a hard cushion material is arranged on the rear side of the bumper in front of the front wheel, And the V-shaped weak part is formed in the side frame (side member) facing the inner side surface of the front wheel. When the opponent vehicle collides from the front direction, the fragile portion of the side frame is deformed, and the collision load is transmitted to the front end portion of the side sill via the front wheel while moving the front side of the front wheel to the inside of the vehicle body. It is configured as follows. In other words, both Patent Documents 1 and 2 receive the collision load in a distributed manner on both the side frame and the side sill.

JP 2002-249079 A Japanese Patent No. 3591507

  By the way, in a frontal collision of a vehicle, an offset collision with a small overlap amount (referred to as a small overlap collision) in which a colliding object moves from the front along the outer side surface of the side member of the own vehicle. ) In the case of such a collision mode, the collision partner cannot be received by the side member which is a skeleton member, so that the collision partner greatly enters the cabin side. At this time, the collision object is received only by the side sill through the front wheel. For this reason, since a large collision load is input to the side sill in a concentrated manner, the side sill is easily deformed, and the deformation near the cabin on which the occupant is riding may increase.

  In the vehicle body front part structure described in Patent Documents 1 and 2 as described above, the front wheel is configured to hit the side sill. For this reason, depending on the magnitude of the collision load, the side sill may be deformed when the front wheel of the host vehicle pressed by the opponent vehicle hits the side sill in a small overlap collision, and the cabin may be greatly deformed.

  The present invention can suppress a collision load input from the front from being input to the side sill via the front wheel at the time of a small overlap collision, which is an offset collision with a small overlap rate, and can reduce the degree of deformation of the cabin. The object is to provide a front body structure.

One embodiment of the vehicle body front structure includes a pair of left and right frame members extending in the front-rear direction of the vehicle body of the vehicle, and disposed on the rear side of the front wheel of the vehicle on the outer side in the vehicle width direction than the frame member. A pair of left and right side sills extending in the front-rear direction of the vehicle body and a behavior control member. The behavior control member has a first portion supported by the frame member in front of the front wheel, and a second portion extending outward in the vehicle width direction from the first portion, When a collision load more than a predetermined value acts on the second part from the front of the vehicle at the time of a collision, the second part turns to the rear side of the vehicle body with the first part as a fulcrum, and the second part The front side of the wheel part of the front wheel is pushed inward in the vehicle width direction, the rear side of the wheel part is moved outward in the vehicle width direction, and the wheel part is clamped between the frame member. The second portion has a guide portion that is arranged to extend obliquely outward in the vehicle width direction toward the rear side of the vehicle body in a state where the second portion is sandwiched between the wheel member and the frame member. It may be. Further, the behavior control member is configured such that, in a state where the second portion is rotated to the rear side of the vehicle body, at least a part of the rear end of the wheel portion protrudes outward in the vehicle width direction from the side sill. You may make it move.

  The first part of the behavior control member may have a weak part that is deformed when the second part rotates to the rear side of the vehicle body. The first portion may include a shaft portion that supports the second portion on the frame member so that the second portion can be rotated rearward of the vehicle body. Further, the frame member is constituted by a side member, the first portion is supported by the side member, and the second portion is inclined outward in the vehicle width direction from the first portion toward the front bumper of the vehicle. And may be connected to the front bumper.

  According to the vehicle body front structure of the present invention, a small overlap collision with a small overlap rate with a collision partner (for example, a collision partner vehicle) that collides along the surface of the side member in the vehicle width direction from the front of the vehicle body. In this case, the collision partner is suppressed from pushing the side sill through the wheel portion of the front wheel. Thereby, since the collision load input to the side sill is reduced and the deformation of the side sill is suppressed, the extent to which the cabin is deformed can be reduced.

The perspective view of the front part of the vehicle body provided with the vehicle body front part structure which concerns on 1st Embodiment. The side view of the front part of the vehicle body shown in FIG. The bottom view which looked at the front part of the vehicle body shown by FIG. 1 from the downward direction. The bottom view of the state which the front part of the vehicle body shown by FIG. 3 deform | transformed by the offset collision. The bottom view of a part of vehicle body provided with the vehicle body front part structure according to the second embodiment.

Hereinafter, a vehicle including a vehicle body front structure according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is a perspective view showing a front portion of a vehicle body 10 of the vehicle, and FIG. 2 is a side view of the front portion of the vehicle body 10. The direction indicated by the arrow X1 indicates the front of the vehicle (front of the vehicle body), the arrow X2 indicates the rear of the vehicle (rear of the vehicle body), and the arrow Y indicates the width direction of the vehicle (vehicle width direction). The arrow Z1 in FIG. 2 indicates the upper side of the vehicle body, and the arrow Z2 indicates the lower side of the vehicle body.

  The vehicle body 10 has a pair of left and right side members 11 and 12 as viewed from the front of the vehicle. The side members 11 and 12 are examples of frame members that form the skeleton of the vehicle body 10, and extend in the front-rear direction of the vehicle body 10. Front wheels 23 and 24 are arranged on both sides of the front portions 11a and 12a of the side members 11 and 12, respectively. Side sills 13, 14 are provided along the side members 11, 12 on the rear side of the vehicle body of the front wheels 23, 24. The side sills 13 and 14 are disposed on the outer side in the vehicle width direction than the side members 11 and 12. Front pillars 15 and 16 extend upward from the front ends of the side sills 13 and 14.

  A cabin (vehicle compartment) 21 on which a passenger rides is formed above the cross member 20 and the floor member disposed between the side sills 13 and 14. A seat on which an occupant sits is disposed in the cabin 21. An engine room 22 is formed in front of the cabin 21. The front portions 11 a and 12 a of the side members 11 and 12 extend toward the engine room 22.

  The rear portions 11 b and 12 b of the side members 11 and 12 extend toward the cabin 21. A cowl top member 25 and a deck cross member 26 that extend in the vehicle width direction are also disposed between the front pillars 15 and 16.

  The front ends of the side members 11 and 12 are connected to each other by a front end cross member 30. The front end cross member 30 extends in the vehicle width direction. As shown in FIG. 2, a front bumper 31 is disposed on the front side of the front end cross member 30. Upper frames 35 and 36 are provided above the front portions 11a and 12a of the side members 11 and 12, respectively. The front ends of the upper frames 35 and 36 are connected to each other by a front end upper bar 37.

  FIG. 3 is a bottom view of the vehicle body 10 as viewed from below. A suspension cross member 40 extending in the vehicle width direction is disposed on the lower surface side of the side members 11 and 12. Both end portions 40a and 40b of the suspension cross member 40 are fixed to the side members 11 and 12, respectively. Suspension arms 41 and 42 forming a part of the front suspension are provided at both ends 40a and 40b of the suspension cross member 40, respectively. A shock absorber and a suspension coil spring are disposed above the suspension arms 41 and 42. An example of the front suspension shown in FIG. 3 is an independent suspension type strut suspension, but may be a wishbone type suspension or another type of suspension.

  Since the pair of left and right suspension arms 41 and 42 are symmetrical with respect to the center line C of the vehicle body 10 and have a common structure to each other, the suspension arm 41 that supports one front wheel 23 will be representatively described below. explain.

  The suspension arm 41 is supported so as to be rotatable in the vertical direction with respect to the side member 11 with the front pivot portion 45 and the rear pivot portion 46 as the center. The suspension arm 41 has a wheel support portion 48 that supports the axle hub 47 of the front wheel 23. The suspension arm 41 extends from the wheel support portion 48 toward the front pivot portion 45 in the vehicle width direction, and extends obliquely rearward from the wheel support portion 48 toward the rear pivot portion 46. And a second arm portion 52.

  Each of the front wheels 23 and 24 includes a metal wheel portion 60 and a pneumatic tire 61 attached to the outer periphery of the wheel portion 60. The wheel part 60 may be a press-formed product of a steel plate, or may be a forged product or a cast product of an aluminum alloy. These front wheels 23 and 24 are supported by wheel support portions 48 of suspension arms 41 and 42 via axle hubs 47, respectively.

The front portions 11a and 12a of the side members 11 and 12 are provided with behavior control members 71 and 72 that protrude outward in the vehicle width direction in front of the front wheels 23 and 24, respectively. The side members 11 and 12 and the behavior control members 71 and 72 form part of the vehicle body front structure. These behavior control members 71 and 72 have a symmetrical shape with respect to the center line C (shown in FIG. 3) of the vehicle body 10, but the structures are common to each other, so that they are attached to one side member 11 below. The behavior control member 71 will be described as a representative.
Similar to the side member 11, the behavior control member 71 is made of a metal such as steel, and a base end portion thereof is fixed and supported on a surface 11 c of the side member 11 on the outer side in the vehicle width direction. That is, the behavior control member 71 includes a first portion 75 that is a base end portion fixed to the outer surface 11c in the vehicle width direction, and an obliquely outward vehicle width direction from the first portion 75 toward the front side of the vehicle body. And a second portion 76 that extends. The distal end side of the behavior control member 71, that is, the distal end 77 of the second portion 76 is connected to the front bumper 31.

  The first portion 75 of the behavior control member 71 is fixed to a surface 11c on the outer side in the vehicle width direction of the side member 11 by a fixing means such as welding at a position in front of the front wheel 23. Bolts and rivets may be used for the fixing means. The distal end 77 of the second portion 76 of the behavior control member 71 is located on the front side of the vehicle body with respect to the first portion 75, and is connected to the front bumper 31 by a detachable connecting means such as a resin rivet.

  When the collision partner W (shown in FIG. 4) enters the front wheel 23 along the side member 11 from the front of the vehicle body 10, the second part 76 of the behavior control member 71 is In a normal state (a state before the collision), the side member 11 extends obliquely forward from the surface 11c on the outer side in the vehicle width direction toward the end 31a of the front bumper 31 so that it can hit. .

  When the collision load F1 (a load that deforms the behavior control member 71) is applied from the front, the second portion 76 has the first portion 75 as a fulcrum and the front end side is on the rear side of the vehicle body. It is configured to rotate. Moreover, the second portion 76 has such a length that the locus M drawn by the second portion 76 overlaps with the front end 60a of the wheel portion 60 of the front wheel 23 when the second portion 76 is rotated rearward by the collision load F1 from the front. Have. In other words, the second portion 76 has a length such that the second portion 76 contacts the front end 60a of the wheel portion 60 when the second portion 76 rotates to the rear side of the vehicle body. Finally, a portion on the front end 60a side of the wheel portion 60 is sandwiched between the second portion 76 and the outer surface 11c of the side member 11 in the vehicle width direction.

  In addition, the weak part 80 used as the starting point of rotation of the 2nd part 76 is provided in the site | part (surface) of the vehicle rear side of the 1st part 75 of the behavior control member 71 when the collision load F1 acts. ing. An example of the fragile portion 80 is a recess or groove formed in a V shape or a U shape, but other than this, for example, by forming a thin portion or a hole in the first portion 75, a collision exceeding a predetermined value input from the front side. Any shape may be used as long as the second portion 76 can facilitate the rotation of the second portion 76 toward the rear side of the vehicle body with the first portion 75 as a fulcrum by the load.

  Further, the behavior control member 71 has a guide portion 78 that abuts the collision partner W and guides the collision partner W away from the vehicle body 10, that is, outside in the vehicle width direction. The guide portion 78 is configured by a portion (surface) on the vehicle body front side of the second portion 76, and the second portion 76 is rotated rearward of the vehicle body by a collision load F1 (shown in FIG. 4) from the front. In this state, the vehicle faces outward in the vehicle width direction. In the state where the vicinity of the front end 60a of the wheel portion 60 is sandwiched between the second portion 76 and the side member 11, the guide portion 78 is inclined outward in the vehicle width direction from the first portion 75 toward the rear side of the vehicle body. The collision partner W is guided so as to relatively move along the guide portion 78.

  Below, the behavior at the time of a collision of the vehicle body front structure provided with the behavior control members 71 and 72 will be described as a representative of the one behavior control member 71. FIG. 4 shows a case where a small overlap collision is assumed, and shows a state in which a collision partner (impactor) W has an offset collision from the front to a portion on the outer side in the vehicle width direction from the side member 11 of the vehicle body 10. The small overlap collision referred to in this specification means that the collision partner W is moved from the front of the vehicle body 10 along the surface 11c (or 12c) on the outer side in the vehicle width direction of the side member 11 (or 12) of the own vehicle. Or, it is a collision that enters toward 124), and is an offset frontal collision with a relatively small amount of overlap with the collision partner W.

  When the collision load F1 is input to the front portion of the vehicle body 10 from the front of the vehicle body 10 outside the side member 11 in the vehicle width direction, the end 31a of the front bumper 31 of the vehicle is first pushed by the collision partner W. Is deformed to the rear side of the vehicle body. When the collision partner W further moves to the rear of the vehicle body, the collision partner W hits the second portion 76 of the behavior control member 71, and the second portion 76 is pushed to the rear side of the vehicle body. It pivots to the rear side with the portion 75 as a fulcrum.

  While the second portion 76 is turning to the rear side of the vehicle body, the vicinity of the tip 77 of the second portion 76 hits the vicinity of the front end 60a of the wheel portion 60 of the front wheel 23 from the outside in the vehicle width direction. At this time, a part of the collision load input to the wheel support portion 48 is transmitted to the side member 11 via the first arm portion 51 and the second arm portion 52 of the suspension arm 41 and is received by the side member 11. .

  As shown in FIG. 4, when the second portion 76 of the behavior control member 71 hits the vicinity of the front end 60a of the wheel portion 60, the front side of the wheel portion 60 is inward in the vehicle width direction centering on the wheel support portion 48 of the suspension arm 41. It will be moved and will be in the state pinched between the side member 11 and the 2nd part 76 of the behavior control member 71. FIG. At the same time, the rear end 60b of the wheel portion 60 rotates in the direction away from the side member 11 toward the outside of the vehicle body. That is, the wheel portion 60 is moved in a direction in which at least a part of the rear end 60 b of the wheel portion 60 protrudes outward in the vehicle width direction from the side sill 13. For this reason, the wheel portion 60 is restrained from moving toward the side sill 13, and the rear end 60 b of the wheel portion 60 is hardly brought into contact with the side sill 13. For this reason, transmission of the collision load to the side sill 13 is suppressed.

  Further, as shown in FIG. 4, the second portion 76 of the behavior control member 71 rotates to the rear side of the vehicle body, and the vicinity of the front end 60 a of the wheel portion 60 is sandwiched between the second portion 76 and the side member 11. In this state, the front surface of the second portion 76 facing the vehicle body is directed outward in the vehicle width direction, and a guide portion 78 is formed extending obliquely outward in the vehicle width direction from the first portion 75 toward the vehicle body rear side. .

  Since the collision partner W moves to the rear of the vehicle body along the guide portion 78, the vehicle body 10 and the collision partner W are moved by the component force in the vehicle width direction generated at the contact portion between the guide portion 78 and the collision partner W. A force (lateral force) is generated in a direction away from each other in the vehicle width direction. As a result, the collision partner W is pushed in the direction away from the vehicle body 10 (the direction schematically shown by the arrow F2 in FIG. 4) while the collision partner W relatively moves toward the rear side of the vehicle body. That is, since the collision partner W is guided along the guide portion 78 so as to move relatively outward in the vehicle width direction, the force to the rear of the vehicle body input from the collision partner W to the front wheel 23 (wheel portion 60). (Collision load) is reduced, and the movement of the front wheel 23 (wheel portion 60) to the rear of the vehicle body (side sill 13 side) is further suppressed. As a result, since the concentration of the collision load on the side sill 13 is alleviated, the deformation of the side sill 13 is suppressed, and the degree of deformation of the cabin 21 can be reduced.

  FIG. 5 is a bottom view of a part of the vehicle body provided with the vehicle body front part structure of the second embodiment as viewed from below. The pair of left and right behavior control members 71 ′ and 72 ′ are symmetrical with respect to the center line C of the vehicle body. However, since the structures are common to each other, one behavior control member 71 ′ will be described as a representative. In the behavior control member 71 ′, the first portion 75 is supported by the shaft portion 90 so as to be rotatable in the longitudinal direction of the vehicle body with respect to the side member 11. The shaft portion 90 rotates the second portion 76 so that the second portion 76 can turn to the rear side of the vehicle body with the first portion 75 as a fulcrum when the offset collision load from the front is input. I support it as possible.

  In addition, in the vicinity of the tip 77 of the second portion 76 of the behavior control member 71 ′ of the second embodiment, the second portion 76 is rotated to the rear side of the vehicle body while drawing the locus M by the collision load. The hook portion 91 having a shape that is easily hooked is provided near the front end 60a of the wheel portion 60. Since the vehicle body front part structure of the second embodiment is the same as the vehicle body front part structure (FIGS. 1 to 4) of the first embodiment, the same parts are common to both. The description will be omitted.

  Needless to say, in implementing the present invention, the specific elements constituting the vehicle body front part structure can be variously changed, including the configuration and arrangement of the frame members such as the side members and the behavior control members. For example, the behavior control member may be attached to a frame member other than the side member.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 11, 12 ... Side member (frame member), 13, 14 ... Side sill, 23, 24 ... Front wheel, 41, 42 ... Suspension arm, 60 ... Wheel part, 61 ... Tire, 71, 72 ... Behavior control member 71 ', 72' ... behavior control member, 75 ... first part, 76 ... second part, 78 ... guide part, 80 ... weak part, W ... collision partner.

Claims (6)

A pair of left and right frame members extending in the longitudinal direction of the vehicle body;
A pair of left and right side sills arranged on the rear side of the front wheel of the vehicle on the outer side in the vehicle width direction than the frame member and extending in the front-rear direction of the vehicle body along the frame member;
A first portion supported by the frame member in front of the front wheel; and a second portion extending outward in the vehicle width direction from the first portion; When a predetermined or more collision load is applied to the second part, the second part turns to the rear side of the vehicle body with the first part as a fulcrum, and the second part rotates the wheel part of the front wheel. A behavior control member that pushes the front side inward in the vehicle width direction and moves the rear side of the wheel portion outward in the vehicle width direction to sandwich the wheel portion between the frame member;
The vehicle body front part structure characterized by comprising.   The second portion of the behavior control member is arranged to extend obliquely outward in the vehicle width direction toward the rear side of the vehicle body in a state where the wheel portion is sandwiched between the second portion and the frame member. The vehicle body front part structure according to claim 1, further comprising a guide part.   The behavior control member moves the wheel portion in a direction in which at least a part of the rear end of the wheel portion protrudes outward in the vehicle width direction from the side sill in a state where the second portion rotates to the rear side of the vehicle body. The vehicle body front part structure according to claim 1 or 2, characterized by being made.   The first part of the behavior control member has a weak part that is deformed when the second part rotates to the rear side of the vehicle body. The vehicle body front structure described in the paragraph.   The first portion of the behavior control member has a shaft portion that supports the second portion on the frame member so that the second portion can be rotated rearward of the vehicle body. The vehicle body front part structure according to any one of claims 1 to 3.   The frame member is constituted by a side member, the first part is supported by the side member, and the second part is inclined obliquely outward in the vehicle width direction from the first part toward the front bumper of the vehicle. The vehicle body front part structure according to any one of claims 1 to 5, wherein the front body bumper extends and is connected to the front bumper.

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