JP2007331614A - Body front structure - Google Patents

Abstract

An object of the present invention is to make it possible to secure more deformation strokes of a hood at a portion on the outer side in the vehicle width direction from an upper support member constituting an upper portion of a functional component holding portion.
When a connecting member 16 that connects a radiator support upper 12 (upper support member) and an apron upper member 14 (reinforcing portion) on both sides of a vehicle body receives a load exceeding a predetermined value on the vehicle lower side, the radiator The support upper 12 and the apron upper member 14 are separated from each other. For this reason, when a collision body collides with the site | part on the vehicle width direction outer side from the radiator support upper 12 in the hood 28, ie, the site | part of the connection member 16, it is possible to ensure more deformation strokes of this hood 28. .
[Selection] Figure 1

Description

  The present invention relates to a vehicle body front structure.

A configuration is disclosed in which a hood deformation stroke is secured by allowing the hood stopper to completely fall out of the mounting hole of the radiator support when a downward contact load of a predetermined value or more acts on the hood. (See Patent Document 1).
JP 2005-1493 A

  However, the above-described conventional example is intended to ensure the deformation stroke of the hood at the radiator support (functional component holding portion), and it is difficult to apply to the outer side in the vehicle width direction than the radiator support. It was.

  In view of the above facts, an object of the present invention is to make it possible to secure more deformation strokes of the hood at a portion on the outer side in the vehicle width direction than the upper support member that constitutes the upper portion of the functional component holding portion.

  The invention of claim 1 constitutes the upper part of the functional component holding part provided in the front part of the vehicle body, and is provided on both sides of the vehicle body behind the vehicle body with an upper support member arranged along the vehicle width direction. The upper support member and the reinforcement portion are arranged so as to connect the reinforcement portion, the upper support member, and the reinforcement portions on both sides of the vehicle body, respectively, when a predetermined load or more is applied to the vehicle lower side. And a connecting member that is disengaged from at least one of the above.

  In the vehicle body front part structure according to claim 1, the connecting member is connected to the both ends of the upper support member in the vehicle width direction and the pair of left and right reinforcing parts, respectively, and the functional component holding part receives a load from the front of the vehicle. When received, the load can be transmitted from the functional component holding part to the reinforcing part. Further, when the hood is deformed and comes into contact with the connecting member, and when the connecting member receives a predetermined load or more on the lower side of the vehicle, the connecting member is detached from at least one of the upper support member and the reinforcing portion. Therefore, it is possible to secure more deformation strokes of the hood at the connecting member.

  According to a second aspect of the present invention, in the vehicle body front part structure according to the first aspect, a first connecting portion in which both ends of the upper support member in the vehicle width direction and the connecting member are connected, and the connecting member and the reinforcement In the second connecting part to which the parts are connected, one of the members to be connected to each other is provided with a notch-shaped mounting hole that allows the connecting member to be detached to the vehicle lower side, and the members to be connected to each other The other is provided with a shaft portion that is inserted into the mounting hole and is relatively movable in the notch direction of the mounting hole, so that a load more than a predetermined amount on the vehicle lower side does not act on the connecting member. It has a holding means for holding the shaft portion in the mounting hole in a state.

  In the vehicle body front part structure according to the second aspect, the connecting member is connected to the upper support member at the first connecting portion and is connected to the reinforcing portion at the second connecting portion. In the first connecting portion and the second connecting portion, the shaft portion provided in the other member is inserted into the notch-shaped attachment hole provided in one member and held by the holding means. For this reason, in a state where a predetermined load or more on the lower side of the vehicle does not act on the connecting member, the load can be transmitted from the radiator support to the reinforcing portion. Further, when the hood is deformed and abuts against the connecting member, when the connecting member receives a predetermined load or more on the vehicle lower side, the holding of the shaft portion by the holding means is released, and the shaft portion is attached to the mounting hole. Therefore, the connecting member is detached from at least one of the upper support member and the reinforcing portion. Thereby, it is possible to ensure more deformation strokes of the hood at the portion of the connecting member.

  According to a third aspect of the present invention, in the vehicle body front structure according to the second aspect, the shaft portion is a stud bolt, the holding means is fastened to the stud bolt, and the peripheral portion of the mounting hole is set to the other end. It is characterized by being a nut held between these members.

  In the vehicle body front part structure according to claim 3, since the connecting member is connected to the upper support member and the reinforcing portion by fastening using the stud bolt and the nut, the stud bolt is adjusted by adjusting the tightening torque of the nut. A detachment load that detaches from the mounting hole can be set.

  According to a fourth aspect of the present invention, in the vehicle body front portion structure according to the second aspect, the holding means is configured so that the shaft portion extends from the mounting hole when the load on the vehicle lower side with respect to the connecting member is less than a predetermined value. It is characterized by being a lock mechanism that regulates not to be detached and releases the regulation when the load is a predetermined value or more.

  In the vehicle body front structure according to claim 4, in a state where a load more than a predetermined amount on the lower side of the vehicle does not act on the connecting member, the lock mechanism restricts the shaft portion from being detached from the mounting hole. Load can be transmitted from the functional part holding part to the reinforcing part. Further, when the hood is deformed and comes into contact with the connecting member, and when the connecting member receives a predetermined load or more on the lower side of the vehicle, the restriction of the shaft portion by the lock mechanism is released, and the shaft portion is attached to the mounting hole. Therefore, the connecting member is detached from at least one of the upper support member and the reinforcing portion. For this reason, it is possible to secure more deformation strokes of the hood at the portion of the connecting member.

  As described above, according to the vehicle body front part structure according to claim 1 of the present invention, the deformation stroke of the hood can be reduced at the outer side in the vehicle width direction from the upper support member constituting the upper part of the functional part holding part. The excellent effect that more can be secured is obtained.

  According to the vehicle body front part structure of the second aspect, when the connecting member receives a predetermined load or more on the vehicle lower side, the holding of the shaft part in the notch-shaped mounting hole is released. An excellent effect is obtained that a larger number of deformation strokes of the hood can be secured at the connecting member.

  According to the vehicle body front part structure according to the third aspect, an excellent effect is obtained in that a separation load at which the stud bolt is detached from the mounting hole can be set by adjusting the tightening torque of the nut.

  According to the vehicle body front part structure described in claim 4, when the connecting member receives a load exceeding a predetermined value on the vehicle lower side, the restriction of the shaft portion by the lock mechanism in the notch-shaped mounting hole is released. By doing so, the outstanding effect that more deformation | transformation strokes of the hood in the site | part of a connection member can be ensured is acquired.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
In FIG. 1, a vehicle body front part structure S1 according to the present embodiment relates to a structure around a radiator support 10 as an example of a functional component holding part provided at the vehicle body front part, and a radiator support upper 12 as an example of an upper support member. And an apron upper member 14 which is an example of a reinforcing portion, and a connecting member 16.

  A radiator support 10 is a holding member for a heat exchanger (not shown) such as a radiator provided in a front portion of a vehicle body, for example, a radiator, and includes a radiator support upper 12 constituting an upper portion and a radiator constituting a lower portion. The support lower 20 and the radiator support side 22 provided upright on both sides constitute, for example, a substantially rectangular frame shape surrounding the heat exchanger.

  The radiator support upper 12 constitutes an upper portion of the radiator support 10 and is a member disposed along the vehicle width direction, and is configured to be able to hold an upper portion of a heat exchanger (not shown). As shown in FIG. 3, a stud bolt 24, which is an example of a shaft portion, is erected in a substantially horizontal direction on the outer side in the vehicle width direction, for example, at an end portion in the vehicle width direction of the radiator support upper 12.

  1 and 3, the apron upper member 14 is a strength member provided on both sides of the vehicle body behind the radiator support upper 12, and is disposed along the vehicle body longitudinal direction, for example, a front suspension mounting portion ( (Not shown), both side portions in the vehicle width direction at the front portion of the vehicle body are reinforced.

  The connecting member 16 is disposed so as to connect the radiator support upper 12 and the apron upper members 14 on both sides of the vehicle body. The strength member is configured to be detached from at least one of the members 14. As shown in FIG. 2, the connecting member 16 has, for example, a substantially arc shape in a plan view of the vehicle body in order to connect the vehicle width direction end of the radiator support upper 12 and the front end of the connecting member 16 in the vehicle body front-rear direction. Is formed. As shown in FIG. 3, a stud bolt 26, which is an example of a shaft portion, is erected in a substantially horizontal direction on the outer side in the vehicle width direction, for example, at the front end portion of the connecting member 16 in the vehicle longitudinal direction.

  In FIG. 5, considering that the collision body 18 collides with the hood 28 at the front part of the vehicle body, the protection region 30 in which the collision body 18 is protected at the front part of the vehicle body is set as shown by hatching in FIG. Is done. The connecting member 16 is disposed at a position that overlaps the protection region 30 in a plan view of the vehicle body.

  As shown in FIG. 3, in the first connecting portion 31 where the connecting member 16 and the end portion of the radiator support upper 12 are connected, a flange 16A having a notch-shaped mounting hole 16C on the connecting member 16 side. Is provided. Further, in the second connecting portion 32 where the connecting member 16 and the front end of the apron upper member 14 are connected, a flange 16B having a notch-shaped mounting hole 16D is provided on the connecting member 16 side. The flange 16A in the first connecting portion 31 will be described as an example. In FIG. 4, the stud bolt 24 is inserted into the mounting hole 16C, and the stud bolt 24 is relatively movable in the notch direction of the mounting hole 16C. It has become.

  Specifically, the impact angle defined in each pedestrian head protection performance test in ENCAP and JNCAP (Europe and Japan Car Assessment), that is, the angle at which the head impactor is ejected from the injector is a sedan type vehicle. In this case, since the angle is 50 ° and 65 ° from the horizontal direction line HL, the notch direction of the mounting hole 16C is set to correspond to both of these angles. That is, the direction in which the flange 16A can be detached from the stud bolt 24 is set in a range of 50 to 65 ° from the horizontal direction line HL to the vehicle lower side and the vehicle rear side. In FIG. 3, the same applies to the mounting hole 16D of the flange 16B in the second connecting portion 32. Note that the notch direction of the mounting hole 16C is not limited to the above-described angle range, and the impact angle of the head impactor varies depending on the vehicle type, so another angle range may be selected according to the vehicle type.

  As shown in FIG. 3, nuts 34 and 36 as an example of holding means are fastened to the stud bolts 24 and 26. The predetermined load at which the connecting member 16 is detached from the radiator support upper 12 at the first connecting portion 31, that is, the separation load is adjusted by the tightening torque of the nut 34, and the connecting member 16 is removed from the apron upper member 14 at the second connecting portion 32. The separation load to be separated is adjusted by the tightening torque of the nut 36.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 1, in the vehicle body front structure S <b> 1, the radiator support upper 12 and the apron upper member 14 are connected by the connecting member 16, so that the body rigidity of the vehicle front part is further improved. In general, the apron upper member 14 and the vicinity thereof serve as a mounting portion for a front suspension (not shown). However, since the radiator support upper 12 and the apron upper member 14 are connected by the connecting member 16, the tire on one side (see FIG. The load input to the apron upper member 14 through the suspension from the apron upper member 14 can be transmitted to the opposite apron upper member 14, thereby suppressing the torsion of the vehicle body. Further, when the radiator support upper 12 receives a load from the front of the vehicle at the time of a frontal collision, the load can be transmitted to the apron upper member 14 via the connecting member 16.

  Next, in FIG. 5, a case where the collision body 18 collides with a portion of the connecting member 16, for example, the hood 28 in the first connecting portion 31 will be described. The collision load F from the collision body 18 transmitted to the connecting member 16 via the hood 28 is not less than a predetermined separation load set by the tightening torque of the nut 34, and the impact angle is approximately 50 to 65 °. In this case, the flange 16 </ b> A moves in a direction away from the stud bolt 24. Then, when the stud bolt 24 is relatively removed from the mounting hole 16C of the flange 16A, the holding of the flange 16A by the stud bolt 24 and the nut 34 is released, and the connecting member 16 is detached from the radiator support upper 12.

  The same applies to the detachment of the flange 16B in the second connecting portion 32, and the connecting member 16 is detached in at least one of the first connecting portion 31 and the second connecting portion 32, so that the radiator support upper 12 is located on the outer side in the vehicle width direction. It is possible to secure more deformation strokes of the hood 28 at the site, that is, the site of the connecting member 16.

[Second Embodiment]
In FIG. 6, the vehicle body front structure S <b> 2 according to the present embodiment has a lock mechanism 40 as a holding means for the connecting member 38.

  The connecting member 38 is, for example, a strength member having an L-shaped cross section, and a mounting hole 38C is provided at the front end of the vertical wall portion 38A and the vehicle upper direction is opened, and the rear end of the vertical wall portion 38A is the vehicle downward direction. Is provided with a mounting hole 38D.

  As shown in FIG. 6, both ends of the radiator support upper 12 in the vehicle width direction are provided with mounting surfaces 42 facing obliquely forward on the outer side in the vehicle width direction, and stud bolts 24 are provided on the mounting surfaces 42. Each is established. On the other hand, the front end of the apron upper member 14 is provided with a mounting surface 44 facing obliquely forward on the outer side in the vehicle width direction, and a stud bolt 26 is erected on the mounting surface 44. The connecting member 38 is mounted so as to be spanned between the mounting surfaces 42 and 44, the mounting hole 38 </ b> C engages with the stud bolt 24 in the first connecting portion 31, and the mounting hole 38 </ b> D in the second connecting portion 32. The stud bolt 26 is engaged. Instead of the stud bolts 24 and 26, pins (not shown) having the same outer diameter may be erected on the mounting surfaces 42 and 44.

  The lock mechanism 40 restricts the stud bolt 24 from being detached from the mounting hole 38C when the load on the lower side of the vehicle with respect to the connecting member 38 is less than a predetermined value, and restricts the restriction when the load is greater than or equal to the predetermined value. It is configured to release. Specifically, a nut 46 is fixed to the vertical wall portion 38 </ b> A of the connecting member 38, and a bolt 48 having a left screw is fastened to the nut 46. A link 50 having a front end 50 </ b> A extending to the position of the stud bolt 24 and a rear end 50 </ b> B extending to the position of the stud bolt 26 is rotatably attached to the bolt 48 via a bearing 52. The left screw is used for the screw portion of the bolt 48 in the case of the illustrated lock mechanism 40 on the left side in the vehicle width direction, and the right screw is used in the lock mechanism (not shown) on the right side in the vehicle width direction. Used.

  As shown in FIG. 7, the link 50 includes a front part 50C extending from the front end 50A to the vehicle rearward position of the bolt 48, an intermediate part 50D connected to the rear end of the front part 50C and extending substantially in the vehicle vertical direction, The rear portion 50E extends from the lower end of the intermediate portion 50D to the rear end 50B, and a trigger 50F provided at the upper end of the intermediate portion 50D. As shown in FIGS. 6 and 8, the trigger 50F protrudes above the upper surface 38B through a through hole 38E provided in the upper surface 38B of the connecting member 38 during normal use, and the upper surface of the trigger 50F is The vehicle is inclined downward toward the front end 50A. The inclination is provided in consideration of the impact angle of the head impactor in ENCAP and JNCAP.

  On the same axis as the bolt 48, for example, a torsion coil spring 54 whose one end (not shown) is locked to the stud bolt 24 and whose other end 54 </ b> A is locked to the link 50 is provided. An urging force corresponding to the tightening torque can be applied to the link 50. In other words, by adjusting the tightening torque of the bolt 48, it is possible to set a detachment load at which the restriction of the lock mechanism 40 is released. In order to prevent the bolt 48 from being loosened by the urging force of the torsion coil spring 54, for example, the bolt 48 is preferably fastened with a so-called double nut, or the screwed portion is preferably fixed with an adhesive.

  Since other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. First, referring to FIGS. 7 and 8, the setting of the separation load by the lock mechanism 40 will be described. As shown in FIG. 7, when the bolt 48 is not tightened, the torsion coil spring 54 is in a substantially free state, the front end 50A of the link 50 is spaced apart from the stud bolt 24 and positioned above the vehicle, The rear end 50B is spaced from the stud bolt 26 and positioned below the vehicle, and the trigger 50F is in a state of falling into the through hole 38E.

  Here, when the bolt 48 whose thread portion is a left-hand thread is tightened, the link 50 swings counterclockwise around the bolt 48 via the torsion coil spring 54 as shown in FIG. Move. As a result, the front end 50A of the link 50 approaches or abuts against the stud bolt 24 from above the vehicle, the stud bolt 24 is held in the mounting hole 38C of the connecting member 38, and the rear end 50B of the link 50 is the stud. The bolt 26 approaches or comes into contact with the bolt from below, and the stud bolt 26 is held in the mounting hole 38D of the connecting member 38.

  In FIG. 8, a biasing force of the torsion coil spring 54 based on the tightening torque T of the bolt 48 at this time generates a counterclockwise moment M = F1 × L1 + F2 × L2 on the link 50 (not shown). Here, when the clockwise moment acting on the link 50 due to vibration or the like during normal use of the vehicle is M0 (not shown), the restriction of the stud bolts 24 and 26 by the lock mechanism 40 is not released during normal use. Therefore, the tightening torque T is set so that the relationship of M0 <M is satisfied. As shown in FIG. 9, when the collision body 18 collides, the collision load F is input to the trigger 50F. Therefore, in FIG. 8, the moment MC = F × L3 acts on the link 50 in the clockwise direction in FIG. Not shown). At this time, in order to release the restriction of the stud bolts 24 and 26 at the front end 50A and the rear end 50B, the link 50 is swung clockwise against the urging force of the torsion coil spring 54, and the tightening torque T Is set so that the relationship of M <MC is satisfied.

  By adjusting the tightening torque T of the bolt 48 as described above, the lock mechanism 40 is not applied to the connecting member 38 in a state where a predetermined load or more is applied to the lower side of the vehicle, that is, when the vehicle is normally used. The restriction of the stud bolts 24 and 26 due to is not released, and the connection state between the radiator support upper 12 and the apron upper member 14 by the connecting member 38 is maintained. As a result, the rigidity of the front portion of the vehicle body can be increased to suppress torsional deformation of the vehicle body, and the collision load can be transmitted from the radiator support upper 12 to the apron upper member 14 via the connecting member 38 at the time of frontal collision. can do.

  Next, the operation when the collision load F from the collision body 18 acts on the link 50 in FIG. 9 will be described. In the vehicle body front structure S2, when the collision load F is input to the trigger 50F, the link 50 swings clockwise against the urging force of the torsion coil spring 54, and the front end 50A is a vehicle having the stud bolt 24. While moving upward, the rear end 50 </ b> B moves downward of the stud bolt 26 in the vehicle. As a result, the restriction of the stud bolts 24 and 26 by the lock mechanism 40 is released, so that the connecting member 38 is centered on the stud bolt 26 in the second connecting portion 32 by its own weight or collision load F, that is, in the vehicle direction. The front end of the connecting member 38 in the first connecting portion 31 is detached from the stud bolt 24 by rotating downward. In this way, in the vehicle body front structure S2, more deformation strokes of the hood (not shown) are secured in the vehicle width direction outer side than the radiator support upper 12, that is, the connection member 38, and the collision load F can be received flexibly.

  In each of the above embodiments, since the connecting members 16 and 38 are detached when a predetermined load or more is input, a gap for securing the deformation stroke of the hood 28 is provided between the hood 28 and the connecting members 16 and 38. Less need to be provided. For this reason, restrictions on the design of the vehicle can be reduced, and for example, the height of the hood 28 can be further reduced.

  In the present embodiment, the connection between the radiator support upper 12 and the connecting member 38 in the first connecting portion 31 is released when the collision body 18 collides. However, the present invention is not limited to this. The connection between the connecting member 38 and the apron upper member 14 in the connecting portion 32 may be released. Moreover, you may comprise so that the connection in both the 1st connection part 31 and the 2nd connection part 32 may be cancelled | released.

  Further, in each of the above embodiments, the radiator support 10 is given as an example of the functional part holding unit, and the radiator support upper 12 is given as an example of the upper support member, but these are not limited to these parts. Similarly, the reinforcing portion is not limited to the apron upper member 14.

1 to 5 relate to the first embodiment, and FIG. 1 is a perspective view of a vehicle body front structure. In a vehicle body front part structure, it is a top view which shows the overlap with a protection region and a connection member. It is an expansion disassembled perspective view which shows the vehicle width direction left side part of a vehicle body front part structure. It is an enlarged side view which shows the flange and stud bolt in a 1st connection part. It is an expanded partial sectional view which shows that a connection member detaches | leaves by the collision load when a collision body collides with a hood. 6 to 9 relate to the second embodiment, and FIG. 6 is a perspective view showing the vehicle body front part structure S2. FIG. 5 is a partial cross-sectional view showing a state where the bolt of the lock mechanism is not tightened in the vehicle body front part structure. In a vehicle body front part structure, it is a fragmentary sectional view which shows the state by which the stud bolt was hold | maintained in the attachment hole of the connection member by the link by clamping | tightening the bolt of a locking mechanism. When a collision body collides with a trigger, it is a fragmentary sectional view showing a state where a link swings against the urging force of a torsion coil spring due to the collision load and the restriction by the lock mechanism is released.

Explanation of symbols

10 Radiator support (functional component holder)
12 Radiator support upper (upper support member)
14 Apron upper member (reinforcement part)
16 Connecting member 16C Mounting hole 16D Mounting hole 24 Stud bolt (shaft)
26 Stud bolt (shaft)
31 1st connection part 32 2nd connection part 34 Nut 36 Nut 38 Connection member 38C Installation hole 38D Installation hole 40 Lock mechanism S1 Vehicle body front structure S2 Vehicle body front structure

Claims (4)

An upper support member that forms the upper part of the functional component holding part provided in the front part of the vehicle body and is disposed along the vehicle width direction;
Reinforcing portions provided on both sides of the vehicle body behind the upper support member;
The upper support member and the reinforcing portions on both sides of the vehicle body are arranged so as to be connected to each other, and detached from at least one of the upper support member and the reinforcing portion when receiving a load exceeding a predetermined value on the vehicle lower side. A connecting member to be
The vehicle body front part structure characterized by having. One of the members connected to each other in the first connecting portion where the both ends in the vehicle width direction of the upper support member and the connecting member are connected, and the second connecting portion where the connecting member and the reinforcing portion are connected Is provided with a notch-shaped mounting hole that allows the connection member to be detached to the vehicle lower side,
The other of the members connected to each other is provided with a shaft portion that is inserted into the mounting hole and is relatively movable in the notch direction of the mounting hole,
The vehicle body front portion according to claim 1, further comprising holding means for holding the shaft portion in the mounting hole in a state where a load exceeding a predetermined amount does not act on the connecting member on the vehicle lower side. Construction. The shaft portion is a stud stud bolt,
The vehicle body front part structure according to claim 2, wherein the holding means is a nut that is fastened to the stud bolt and holds a peripheral edge portion of the mounting hole between the other member.   The holding means restricts the shaft portion from being detached from the mounting hole when the load on the vehicle lower side with respect to the connecting member is less than a predetermined value, and restricts the shaft when the load is greater than or equal to a predetermined value. The vehicle body front part structure according to claim 2, wherein the vehicle body front part structure is a lock mechanism for releasing the vehicle.

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