JP2005262951A - Vehicle front body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle front body structure capable of efficiently dispersing a load against the collision of the front side of a vehicle and absorbing energy without a considerably increase in weight. <P>SOLUTION: A tension generating bracket 10 to input a collision load via a bumper reinforcement 3 in a head-on collision is provided, the collision load is inputted in a wire 20, a wire supporting bracket 30 to support the wire 20 in a tightened state is provided, the collision load transmitted to the wire 20 is transmitted to the vehicle body side, and tension applied to the wire 20 is maintained by a tension maintaining mechanism 40. Thus, the collision load added to the wire 20 is efficiently dispersed to the vehicle body side, and tension in the wire 20 is maintained by the tension maintaining mechanism 40. The load can be efficiently dispersed and energy is efficiently absorbed by the vehicle body side via the wire 20 while a considerable increase in overall vehicle body weight is suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle body front structure.

  In some automobiles, as a countermeasure against frontal collision, there is an inclined part inclined downward toward the front at the tip of the upper member extending from the front pillar lower to the front of the vehicle, and a vertical part suspended from the tip of the inclined part. There is known a structure in which a skeleton member is attached to suppress load dispersion and energy absorption deterioration of the front part of the vehicle body caused by a difference in the location of the strength member between the collision vehicles (see, for example, Patent Document 1). ).

In this case, the inclined portion is connected and supported to the front side member via a connecting member, and is connected to and supported by a side down member that is vertically extended from the front end of the front side member.
Japanese Patent Laid-Open No. 2003-40142 (page 3, FIG. 1)

  However, in such a conventional vehicle body front structure, it is necessary to provide an inclined portion and a vertical portion, and a connecting member for supporting these members, which increases the weight of the vehicle body and reinforces by the inclined portion and the vertical portion. Since the range is the side in the vehicle width direction, the effect is limited to the offset collision of the frontal collision.

  Therefore, the present invention provides a vehicle body front portion structure that can efficiently perform load distribution and energy absorption against a collision on the front surface of the vehicle without significantly increasing the weight.

In the present invention, in the vehicle body front portion structure in which the bumper reinforcement disposed at the vehicle front end is supported on the vehicle body side via the bumper stay,
A tension generating bracket that inputs a collision load via a bumper reinforcement during a frontal collision,
A wire for inputting the collision load input to the tension generating bracket;
A plurality of wire support brackets that support the wire on the vehicle body side in a tension state and transmit the collision load transmitted to the wire to the vehicle body side,
The main feature is that it includes a tension maintaining mechanism that maintains the tension applied to the wire.

  According to the present invention, the collision load at the time of the frontal collision is input to the tension generating bracket while being deformed by the bumper reinforcement and the bumper stay, and is input from the tension generating bracket to the wire, and the collision load is used as the tension. Convert and add to the wire.

  The tension applied to the wire, that is, the impact load, can be efficiently distributed to the vehicle body via the wire support bracket, and the tension of the wire at this time can be maintained by the tension maintenance mechanism, so the dispersion efficiency to the vehicle body Can be further enhanced.

  Therefore, in the present invention, a tension generating bracket, a wire, a wire support bracket, and a tension maintaining mechanism are added. However, the only heavy member is the tension generating bracket, which significantly increases the overall vehicle weight. While suppressing, load distribution and energy absorption can be efficiently performed on the vehicle body side via the wire.

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

  1 to 7 show a first embodiment of a vehicle body front structure according to the present invention, FIG. 1 is an exploded perspective view of the vehicle body front as viewed from the front, and FIG. 2 is a perspective view of the vehicle body front as viewed from the rear. 3 is an enlarged plan view showing the load input state of the tension generating bracket, FIG. 4 is a plan view of the front part of the vehicle body, FIG. 5 is an enlarged sectional view of the tension maintaining mechanism, and FIG. FIG. 7 is a tension input characteristic diagram of the tension maintaining mechanism.

  As shown in FIG. 1, the front body structure of the first embodiment has a pair of left and right front side members 1 extending in the vehicle front-rear direction on both sides of the front compartments F and C in the vehicle width direction. A front end module 1 is connected to a radio core (radiator core) support member 2 constituting a front end module, and a bumper reinforcement 3 is attached to the lower front side of the radio core support member 2.

  Side arms 2a extending obliquely rearward from both sides of the upper portion of the radio core support member 2 in the vehicle width direction are coupled to the front end of the hood ridge member 4, and a head lamp unit mounting portion is provided below the side arms 2a. 2b is provided.

  The radio core support member 2 includes an upper beam 2c on the upper side and a lower beam 2d on the lower side that extend in the vehicle width direction, side stays 2e on both sides in the vehicle width direction that connect these beams 2c and 2d up and down, and a vehicle width direction. And a center stay 2f in the center.

  The bumper reinforcement 3 extends in the vehicle width direction with a length substantially equal to or longer than the distance between the pair of left and right front side members 1 in the vehicle width direction. The support member 2 is coupled to the front end of the front side member 1 via a bumper stay 5 coupled to the front surface of the side stay 2e.

  In this embodiment, as shown in FIGS. 1 and 2, a tension generating bracket 10 that inputs a collision load via a bumper reinforcement 3 at the time of a frontal collision, and a collision load input to the tension generating bracket 10 are used. , The wire 20 is supported in the tension state of the wire 20, the plurality of wire support brackets 30 that transmit the collision load transmitted to the wire 20 to the vehicle body side, and the tension applied to the wire 20 is maintained. A tension maintaining mechanism 40 is provided.

  As shown in FIG. 3, the tension generating bracket 10 has a pressure receiving portion 11 formed of a high-strength member disposed along the rear surface of the bumper reinforcement 3 along the vehicle width direction, and a rear surface of the pressure receiving portion 11. A load transmitting portion 12 that is coupled and protrudes rearward from the center in the vehicle width direction and transmits the collision load input to the pressure receiving portion 11 to the wire 20 is formed in a T shape in plan view as a whole, Both end portions in the vehicle width direction of the pressure receiving portion 11 are fixed by being sandwiched between both end portions of the bumper reinforcement 3 and the bumper stay 5.

  The tension generating bracket 10 has a pressure receiving portion 11 serving as a connecting portion with the bumper reinforcement 3 having a wide surface shape in the vehicle width direction so as to follow the rear surface shape of the bumper reinforcement 3.

  In FIG. 3, the radio core support member 2 (see FIG. 1) to be disposed between the bumper stay 5 and the front side member 1 is omitted for convenience.

  As shown in FIG. 2, the wire 20 extends from the rear surface of the radio core support member 2 to the front side member 1 as shown in FIG. Yes.

  The wire support bracket 30 includes a load input side bracket 31 for connecting the wire 20 to the tension generating bracket 10, and the wire 20 extending from the load input side bracket 31 as the vehicle body side skeleton member of the front compartment F / C. A load transmission side bracket 32 connected in a stretched state along the support member 2 and the front side member 1 is configured.

  That is, as shown in FIG. 2, the load input side bracket 31 has the radio core support member 2 attached to the rear surface of the center portion 2f of the center stay 2f corresponding to the load transmitting portion 12 of the tension generating bracket 10 in the vertical direction. The collision load input to the tension generating bracket 10 is transmitted to the load input side bracket 31 with the deformation of the center stay 2f.

  Further, the load transmission side bracket 32 is attached at four places on the upper and lower rear surfaces of the side stay 2e of the radio core support member 2 as shown in FIG. 2, and the pair of front side members 1 as shown in FIG. Two points are attached to a portion located at the rear of the vehicle by a predetermined distance L from the front end.

  The intermediate portion of the wire 20 is supported by one load input side bracket 31 attached to the radio core support member 2 and four load transmission side brackets 32 as shown in FIG. As shown in FIG. 4, both ends 20a and 20b of the wire 20 taken out from the load transmission side bracket 32 at the lower part of the side stay 2c are arranged along the pair of front side members 1 and rearward of the vehicle. After being routed, it is supported by two load transmission side brackets 32, routed inward in the vehicle width direction, and connected to the tension maintaining mechanism 40.

  By the way, the wire support bracket 30 including the load input side bracket 31 and the load transmission side bracket 32 applies the tension generated by the tension maintaining mechanism 40 uniformly to the entire wire 20, and the load input side bracket 31. Then, as shown in FIG. 2, the two hollow pipes 31a are formed by crossing and joining in an X shape, and the load transmitting bracket 32 is folded in an L shape as shown in FIGS. It is formed of a bent L-shaped hollow pipe 32a.

  And the wire 20 is penetrated by the wire support bracket 30 formed of the said hollow pipe 31a and the said L-shaped hollow pipe 32a so that relative movement is possible.

  In particular, the load transmission side bracket 32 can deform the supporting portion of the wire 20 when an excessive load is input to the wire 20.

  As shown in FIG. 5, the tension maintaining mechanism 40 includes a housing 41 to which one end 20a of the wire 20 is coupled, and a rod that is slidably fitted into the housing 41 and coupled to the other end 20b of the wire 20. 42, and a compression spring 43 as a spring member that is disposed between the housing 41 and the rod 42 and applies a biasing force in a direction in which the rod 42 is inserted into the housing 41.

  The housing 41 is formed in a cylindrical shape whose both ends are closed by end plates 41a and 41b, and one end portion 20a of the wire 20 is inserted into and coupled to a mounting hole 41c formed in one end plate 41a.

  The rod 42 is slidably inserted through an insertion hole 41d formed in the other end plate 41b of the housing 41, and a piston 42a is formed at the insertion-side distal end thereof so as to be in sliding contact with the inner periphery of the housing 1. A mounting ring 42b is screwed onto the base end side of 42, and the other end 20b of the wire 20 is inserted into and coupled to the mounting ring 42b.

  The compression spring 43 is contracted between the piston 42a and a spring seat 43a disposed on the inner surface of the end plate 41b, and the compression spring 43 urges the rod 42 in a direction in which the rod 42 is pulled into the housing 42. As a result, the urging force of the compression spring 43 acts in the direction of tensioning the wire 20.

  With the above-described configuration, according to the vehicle body front structure of the first embodiment, when the host vehicle M collides frontally with the collision object m as shown in FIG. 6, the collision load F at this time is the bumper reinforcement 3. Further, the force is input to the tension generating bracket 10 with the deformation of the bumper stay 5.

  Then, the tension generating bracket 10 is pushed in while deforming the radio core support member 2 to displace the load input side bracket 31 toward the rear of the vehicle, and the collision load F input to the tension generating bracket 10 is applied to the load input side bracket 31. The collision load F is converted into tension and added to the wire 20.

  The tension applied to the wire 20, that is, the collision load, can be efficiently distributed to the front side member 1 and the radio core support member 2 via the load transmission side bracket 32.

  Moreover, since the tension of the wire 20 at this time can be maintained by the tension maintaining mechanism 40 provided between the both ends 20a and 20b of the wire 20, the dispersion efficiency to the vehicle body can be further increased.

  Therefore, in the present invention, the tension generating bracket 10, the wire 20, the wire support bracket 30, and the tension maintaining mechanism 40 are added. However, the only heavy member is the tension generating bracket 10, and the overall weight of the vehicle body is increased. It is possible to efficiently distribute the load and absorb the energy on the vehicle body side via the wire 20 while suppressing a significant increase in the power.

  In the present embodiment, in addition to the above-described effects, the tension generating bracket 10 has a pressure receiving portion 11 connected to the bumper reinforcement 3 having a wide surface shape in the vehicle width direction along the rear surface shape of the bumper reinforcement 3. Since it is formed, the rigidity and strength of the pressure receiving portion 11 are set higher than the collision load F input to the bumper reinforcement 3, and the collision load F is efficiently transmitted from the bumper reinforcement 3 to the tension generating bracket 10. Can do.

  Further, the wire support bracket 30 includes a load input side bracket 31 for connecting the wire 20 to the tension generating bracket 10 and the wire 20 extending from the load input side bracket 31 as the vehicle core member of the front compartment F / C. Since the load transmission side bracket 32 is connected in a stretched state along the support member 2 and the front side member 1, the collision load F input to the wire 20 from the load input side bracket 31 is converted to the load transmission side bracket. By 32, it can transmit to the vehicle body side efficiently and the load dispersion effect can be enhanced.

  Furthermore, since the wire 20 is inserted into the wire support bracket 30 so as to be relatively movable, the direction of the load acting on the wire 20 can be changed along the wiring direction of the wire 20 and the wire support brackets 30 can be evenly distributed. By applying tension, it is possible to enhance the load distribution effect on the vehicle body side.

  In addition, since the load transmission side bracket 32 can deform the supporting portion of the wire 20 when an excessive load is input to the wire 20, the excessive load input to the wire 20 is released by this deformation, The load can be evenly distributed across the plurality of brackets without burdening the bracket.

  Further, as shown in FIG. 5, the tension maintaining mechanism 40 has a housing 41 coupled to one end 20a of the wire 20 and a slidably fitted into the housing 41 to couple the other end 20b of the wire 20. A rod 42 and a compression spring 43 that is disposed between the housing 41 and the rod 42 and applies a biasing force in a direction in which the rod 42 is inserted into the housing 41. Since a force can be constantly applied to the wire 20 via the housing 41 and the rod 42, the wire 20 can be kept in tension at all times, and the tension state of the wire 20 can be maintained even in the event of a collision. it can.

  FIG. 7 is a tension input characteristic diagram of the tension maintaining mechanism 40, showing the relationship between the displacement amount by the tension maintaining mechanism 40 and the load acting on the wire 20, and the load acting on the wire 20 is the load resistance of the tension maintaining mechanism 40. It is supported and lasts until the wire 20 feed limit, after which the load is transmitted and distributed until the wire support bracket 30 breaks.

  In FIG. 7, an area A is an energy absorption area by the tension maintaining device 40, and an area B is an energy absorption area by the breakage of the wire support bracket 30.

  8 to 11 show first to fourth modifications of the wire support bracket, respectively. The wire support bracket 50 of the first modification shown in FIG. 8 is an eyebolt provided with an annular portion 50a and a bolt portion 50b. The wire 20 is inserted through the annular portion 50a.

  The wire support bracket 51 of the second modified example shown in FIGS. 9A and 9B is premised on the connection with the vehicle body strength member by welding, and forms a hollow shape by the bent round bar 51a. On the other hand, a base 51b is formed by pressing a high-strength steel plate, the hollow 51d of the round bar 51a is projected from the central opening 51c of the base 51b, and the base 51b and the round bar 51a are welded. .

  The wire support bracket 52 of the third modification shown in FIG. 10 supports a roller 52a that supports the wire 20 in a freely rotatable manner between the front end portions 52c of the U-shaped bracket 52b, and bolts are attached to the bottom 52d of the U-shaped bracket 52b. The part 52e is rotatably attached.

  The wire support bracket 53 of the fourth modification shown in FIG. 11 separates the steel plate 53b welded with the hollow pipe 53a and the steel plate 53d with the bolt portion 53c rotatably attached thereto, and supports the wire 20 in a stretched manner on the vehicle body. In order to do so, both the steel plates 53b and 53d are coupled by bolts 53e and nuts 53f.

  12 to 14 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 13 is a cross-sectional side view showing a connecting portion between the tension generating bracket and the load input side bracket, and FIG. 14 is an oblique collision load acting on the tension generating bracket of the first embodiment. It is a top view of a state.

  In the vehicle body front structure of the second embodiment, as shown in FIGS. 12 and 13, a load input side bracket 31 is connected to the tension generating bracket 10 so as to be rotatable in the vehicle width direction.

  That is, as shown in FIG. 13, the load transmitting portion 12 of the tension generating bracket 10 is coupled to the front surface of the center stay 2f of the radio core support member 2 so as to be rotatable in the vehicle width direction, and the load input through the wire 20 is inserted. By connecting the side bracket 31 to the rear surface of the center stay 2f so as to be rotatable in the vehicle width direction, a pivot point P is provided between the tension generating bracket 10 and the load input side bracket 31 as shown in FIG. It is provided.

  Therefore, according to the second embodiment, when an oblique collision load F ′ is input at the time of a frontal collision, the tension generating bracket 10 has its pressure receiving portion 11 opposed to the oblique collision load F ′ as shown in FIG. In this case, when the tension generating bracket 10 and the load input side bracket 31 are fixed as shown in the first embodiment, the load input side bracket 31 is shown in FIG. In addition, a large moment Ma is applied to the portion where the wire 20 is inserted, and further reinforcement is required to cope with it.

  On the other hand, in this embodiment, as shown in FIG. 12, even when the tension generating bracket 10 is inclined due to the oblique collision load F ′, the pivot point P prevents the load input side bracket 31 from being excessively inclined. The mechanism can be maintained by preventing an excessive moment from acting on the load input side bracket 31 and the wire 20.

  Further, as shown in FIG. 13, when the input of the collision load F has an angle in the vertical direction, the support structure for the wire 20, that is, the structure in which the wire 20 is inserted through the hollow portion of the load input side bracket 31, The mechanism is easy to maintain because it has a high degree of freedom.

  FIG. 15 shows a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 15 is an enlarged sectional view of the tension maintaining mechanism. It is.

  In the third embodiment, the tension maintaining mechanism 40A includes a housing 41 as a cylinder to which one end 20a of the wire 20 is coupled, and a wire 40 that is slidably fitted in the housing 41 as shown in FIG. A piston 42a having the other end coupled thereto, a compression spring 43 serving as a spring member disposed between the housing 41 and the piston 42a and applying a biasing force in a direction in which the piston 42a is inserted into the housing 41, And an electromagnetic valve 47 as a fluid supply device for supplying fluid pressure to a first fluid chamber 45 as a tension applying chamber in the housing 41 which is sometimes separated by a piston 42a.

  That is, the tension maintaining mechanism 40A of this embodiment is configured to add fluid pressure to the urging force generated by the tension maintaining mechanism 40 of the first embodiment shown in FIG. 5, and as shown in FIG. 41 is used as a cylinder, and an airtight packing 44 is interposed between the piston 42a and the housing 41 and between the rod 42 and the end plate 41b.

  Of the first fluid chamber 45 and the second fluid chamber 46 in the housing 41 separated by the piston 42a, fluid pressure is required via the electromagnetic valve 47 on the first fluid chamber 45 side where the compression spring 43 is disposed. And the fluid pressure in the other second fluid chamber 46 is drained.

  Therefore, according to the third embodiment, a constant pressure is maintained in the first and second fluid chambers 45, 46 of the housing 41 to maintain a constant tension during normal times, and the electromagnetic valve 47 is switched in the event of a collision. By supplying the fluid pressure to the one fluid chamber 45, a large tension is applied to the wire 20 by the compression spring 43 and the fluid pressure.

  In addition, by applying a pressure using a gas generator used for an air bag or the like instead of the fluid pressure, the operating time can be shortened at the time of a collision and the time lag can be further eliminated.

  FIG. 16 shows a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted. FIG. 16 (a) shows the tension maintaining mechanism. A perspective view and (b) are plan views thereof.

  As shown in FIGS. 16 (a) and 16 (b), the tension maintaining mechanism 60 of the fourth embodiment includes a drum 60a that winds up at least one end of the wire 20, in this embodiment, both ends 20a and 20b, and a collision. And a drive means D for rotating the drum 60a in the winding direction of the wire 20 at times.

  The driving means D is an electric motor 60b as a rotary actuator provided on the rotating shaft of the drum 60a, and the drum 60a is rotated by the electric motor 60b.

  The drum 60a is rotatably attached to the upper stage of the E-shaped bracket 60c for mounting the vehicle body as shown in FIG. 16A, and the electric motor 60b is provided in the lower stage of the E-shaped bracket 60c. ), Both ends 20a and 20b of the wire 20 are coupled to the opposite side of the drum 60a, and the electric motor 60b is rotated so that the both ends 20a and 20b of the wire 20 are simultaneously wound around the drum 60a. ing.

  Therefore, according to the fourth embodiment, the tension can be applied by winding the wire 20 by the continuous rotation of the drum 60a, so that a longer tension maintaining stroke is exerted to reduce the energy absorption amount by the tension maintaining mechanism 60. Can be increased.

  FIG. 17 shows a first modification of the tension maintaining mechanism 60. When the same reference numerals are given to the same components as those in the fourth embodiment, the tension maintaining mechanism 61 replaces the drive means D with a linear actuator. The tip of the piston rod 61b, which is the operating portion of the driving means D, and the drum 60a are connected via an arm 61c, and the drum 60a is rotated by the straight movement of the piston rod 61b. It has become.

  Therefore, according to the tension maintaining mechanism 61, the rotation angle of the drum 60a is limited according to the stroke of the cylinder device 61a, but the tension of the wire 20 can be increased by applying a large rotational force to the drum 60a.

  FIG. 18 shows a second modification of the tension maintaining mechanism 60. When the same reference numerals are given to the same constituent parts as those in the fourth embodiment, the tension maintaining mechanism 62 causes the driving means D to be grounded at the time of collision. A driving tire 62a is provided as a ground rotating body that rolls in contact with the drum 60, and the drum 60a is rotated by the rotation of the driving tire 62a.

  Sprockets 62b and 62c are provided on the driving tire 62a and the drum 60a, respectively, and the rotational force of the driving tire 62a is transmitted to the drum 60a by circulating a chain 62d between the sprockets 62b and 62c. Yes.

  The driving tire 62a is instantly lowered and grounded upon detecting a collision, and the drum 60a is rotated by the rotation of the driving tire 62a so as to wind up both ends 20a and 20b of the wire 20. It has become.

  Therefore, according to the tension maintaining mechanism 62, a large rotational force can be applied to the drum 60a, and a large tension can be applied to the wire 20.

  FIG. 19 shows a third modification of the tension maintaining mechanism 60. When the same reference numerals are given to the same components as in the fourth embodiment, the tension maintaining mechanism 63 is used as the driving means D in the event of a collision. A rear wheel rotation transmission device 63a for taking out the rotation of the wheel Wr is provided, and the drum 60a is rotated by the rear wheel rotation transmission device 63a.

  The rear wheel rotation transmission device 63a is a device that extracts the rotational force from the final reduction gear Dr of the rear wheel Wr via a clutch at the time of a collision, and the rotational force extracted by the rear wheel rotation transmission device 63a is geared via a chain 63b. The drum 60a is rotated by the rotation input to the box 63c and decelerated by the gear box 63c, and the wire 20 is wound up.

  Therefore, according to the tension maintaining mechanism 63, the drum 60a can be rotated with a large rotational force to apply a large tension to the wire 20, and the rotation of the rear wheel Wr is used as a drive source, thereby being affected by a frontal collision. The wire 20 can be wound up without any problems.

  Further, the rotation of the engine can be used as a driving source of the tension maintaining mechanism. In this case, the driving means is provided with an engine rotation transmission device that extracts the rotation of the engine at the time of collision, and the drum 60a is rotated by this engine rotation transmission device. It can be set as the structure to do.

  By the way, although the vehicle body front part structure of the present invention has been described by taking the examples according to the respective embodiments, various other embodiments can be adopted without departing from the gist of the present invention without being limited to these embodiments. it can.

It is the disassembled perspective view which looked at the vehicle body front part in 1st Embodiment of this invention from the front. It is the perspective view which looked at the vehicle body front part in 1st Embodiment of this invention from back. It is an enlarged plan view which shows the load input state of the tension generation bracket in 1st Embodiment of this invention. It is a top view of the vehicle body front part in 1st Embodiment of this invention. It is an expanded sectional view of the tension maintenance mechanism in a 1st embodiment of the present invention. It is a top view of the vehicle body front part which shows the operation state at the time of the front collision in 1st Embodiment of this invention. It is a tension input characteristic figure of a tension maintenance mechanism in a 1st embodiment of the present invention. It is a perspective view which shows the 1st modification of the wire support bracket in 1st Embodiment of this invention. It is a perspective view which shows the 2nd modification of the wire support bracket in 1st Embodiment of this invention, respectively from the front in (a) from the back in (b). It is a perspective view which shows the 3rd modification of the wire support bracket in 1st Embodiment of this invention. It is a perspective view which shows the 4th modification of the wire support bracket in 1st Embodiment of this invention. It is a top view in the state where the diagonal collision load acted on the tension generation bracket in 2nd Embodiment of this invention. It is a cross-sectional side view which shows the connection part of the tension generation bracket and load input side bracket in 2nd Embodiment of this invention. It is a top view in the state where the diagonal collision load acted on the tension generating bracket of the first embodiment. It is an expanded sectional view of the tension maintenance mechanism in a 3rd embodiment of the present invention. (A) in 4th Embodiment of this invention is a perspective view of a tension maintenance mechanism, (b) is the top view. It is a top view which shows the 1st modification of the tension maintenance mechanism of 4th Embodiment. It is a side view showing the 2nd modification of the tension maintenance mechanism of a 4th embodiment. It is a bottom view of vehicles showing the 3rd modification of a tension maintenance mechanism of a 4th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Bumper reinforcement 5 Bumper stay 10 Tension generating bracket 20 Wire 30, 50-53 Wire support bracket 31 Load input side bracket 32 Load transmission side bracket 40, 60-63 Tension maintenance mechanism 41 Housing (cylinder)
42 Rod 43 Compression spring (spring member)
47 Electromagnetic valve 60a Drum 60b Electric motor (rotary actuator)
61a Cylinder device (linear actuator)
62a Driving tire (ground rotating body)
63a Rear wheel rotation transmission device D drive means

Claims (14)

In the vehicle body front structure in which the bumper reinforcement disposed at the vehicle front end is supported on the vehicle body side via a bumper stay,
A tension generating bracket that inputs a collision load via a bumper reinforcement during a frontal collision,
A wire for inputting the collision load input to the tension generating bracket;
A plurality of wire support brackets that support the wire on the vehicle body side in a tension state and transmit the collision load transmitted to the wire to the vehicle body side,
A vehicle body front structure comprising: a tension maintaining mechanism that maintains tension applied to the wire.   The vehicle body front part structure according to claim 1, wherein the tension generating bracket is formed such that a connecting portion with the bumper reinforcement has a wide surface shape in the vehicle width direction along the rear surface shape of the bumper reinforcement.   The wire support bracket includes a load input side bracket that connects the wire to the tension generation bracket, a load transmission side bracket that connects the wire extending from the load input side bracket along the vehicle body skeleton member of the front compartment, and The vehicle body front part structure according to claim 1 or 2, further comprising:   The vehicle body front part structure according to any one of claims 1 to 3, wherein the wire support bracket is inserted through the wire so as to be relatively movable.   The vehicle body front part structure according to any one of claims 1 to 4, wherein the load transmission side bracket is capable of deforming a support portion of the wire when an excessive load is input to the wire.   The vehicle body front part structure according to any one of claims 1 to 5, wherein the load input side bracket is connected to the tension generating bracket so as to be rotatable in the vehicle width direction.   A tension maintaining mechanism is disposed between a housing in which one end of a wire is coupled, a rod that is slidably fitted in the housing and coupled to the other end of the wire, and a rod disposed between the housing and the rod. The vehicle body front part structure according to any one of claims 1 to 6, further comprising: a spring member that applies an urging force in a direction in which the vehicle body is inserted into the housing.   The tension maintaining mechanism is disposed between a cylinder having one end of the wire coupled thereto, a piston slidably fitted in the cylinder and coupled to the other end of the wire, and the cylinder and the piston. And a fluid supply device for supplying fluid pressure to a tension applying chamber in the cylinder separated by a piston at the time of collision. The vehicle body front part structure according to any one of claims 1 to 6.   The tension maintaining mechanism includes a drum that winds up at least one end portion of the wire, and a driving unit that rotates the drum in a winding direction of the wire in the event of a collision. Body front structure as described in 1.   10. The vehicle body front structure according to claim 9, wherein the driving means is provided with a rotation actuator on a rotation shaft of the drum, and the drum is rotated by the rotation actuator.   The vehicle body front part structure according to claim 9, wherein the driving means connects the actuating portion of the linear motion actuator and the drum via an arm, and rotates the drum by a rectilinear movement of the actuating portion.   10. The vehicle body front structure according to claim 9, wherein the driving means includes a ground rotating body that rolls in contact with the ground at the time of collision, and rotates the drum by the rotation of the ground rotating body.   10. The vehicle body front structure according to claim 9, wherein the driving means is provided with a rear wheel rotation transmission device for taking out the rotation of the rear wheel at the time of a collision, and the drum is rotated by the rear wheel rotation transmission device. The vehicle body front structure according to claim 9, wherein the driving means is provided with an engine rotation transmission device that extracts the rotation of the engine at the time of a collision, and the drum is rotated by the engine rotation transmission device.

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