JP2017109591A - Vehicular front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular front structure which can absorb prescribed collision energy.SOLUTION: A vehicular front structure comprises: a pair of side members which are provided on both sides of a vehicle body; a pair crash boxes which comprise a cylindrical member provided at a front end part of each of the pair of side members, and are collapsed by energy equal to or more than a prescribed value from a vehicle body front side; a bumper beam which is constructed on the pair of crash boxes at respective front ends of the pair of crash boxes; a nut member of which one end is fixed to the bumper beam in the state of penetrating a through hole provided on the bumper beam in a front area of the crash box, and with which a traction bolt is engaged; and a bowl-type holding member of which a cross section is gradually reduced an opening of the crash box toward the nut member, and which is joined to the bumper beam and is joined to the other end of the nut member. The side member has an opening, which permits retraction of the nut member and the holding member when collapsing the crash box, on a front face thereof.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a front structure of a vehicle.

  In Patent Document 1, a crash box at the ends of the left and right side members on both sides of a vehicle body, a bumper reinforcement extending in the vehicle body width direction and disposed between the crash boxes, and a traction hook are detachably screwed from the outside of the vehicle body. It is fixed to the side wall of the bumper reinforcement of the crash box, but the traction hook mounting member that is not directly fixed to the side member side part and the traction hook mounting member are connected to the side member side to A tow hook mounting structure having a string-like member having high rigidity in the pulling direction by the hook but low rigidity in the collision direction is disclosed.

JP 2011-168077 A

  In the vehicle front structure disclosed in Patent Document 1, the tow hook mounting member is inserted through the front wall surface (bumper reinforcement side wall surface) of the crash box and the reinforcing plate disposed at some distance inside the front wall surface. Is done. Further, the pulling hook mounting member is fixed to the front wall surface and the reinforcing plate by welding. Thereby, the crash box is reinforced by the pulling hook mounting member and the reinforcing plate, and the crash box is not crushed with a predetermined energy. As a result, the tow hook mounting structure disclosed in Patent Document 1 cannot absorb the predetermined collision energy and transmits the collision energy to the side member.

  In view of the above-described circumstances, at least one embodiment of the present invention aims to provide a vehicle front structure capable of absorbing predetermined collision energy.

(1) A vehicle front structure according to at least one embodiment of the present invention includes a pair of side members provided on both sides of the vehicle body along the vehicle body longitudinal direction, and a cylinder provided at each front end portion of the pair of side members. A pair of crash boxes that are crushed with energy of a predetermined amount or more from the front side of the vehicle body, bumper beams installed on the pair of crash boxes at respective front end portions of the pair of crash boxes, and the crash In the front area of the box, a nut member having one end fixed to the bumper beam in a state of passing through a through hole provided in the bumper beam, and a traction bolt screwed therein, and the nut member from the front opening of the crash box The cross section gradually decreases toward the other end of the tube and is joined to the bumper beam. And a holding member joined to the other end of the nut member, and the side member has an opening on its front surface that allows the nut member and the holding member to retract when the crush box is crushed. Have.

  According to the configuration of (1) above, the hook-shaped holding member whose cross section gradually decreases from the front opening of the crash box toward the nut member is joined to the bumper beam and joined to the other end of the nut member. When the crush box is crushed, the nut member and the holding member retreat to the opening provided on the front surface of the side member. Thereby, the crash box can absorb predetermined energy.

(2) In some embodiments, in the configuration of (1), the holding member has an edge portion that forms a peripheral edge of the bowl shape and is larger than a front opening of the crash box, and the edge portion Is sandwiched between the bumper beam and the crash box and joined to the bumper beam.
According to the configuration of (2) above, since the edge of the holding member is sandwiched between the bumper beam and the crash box and joined to the bumper beam, the crash box is not reinforced by the holding member. Thereby, the crash box can absorb predetermined energy.

(3) In some embodiments, in the above configuration (1) or (2), the holding member has a circular cross section.
According to the configuration of (3) above, the force acts equally from the nut member to which the traction bolt is screwed onto the holding member, so that the traction strength acting on the traction bolt can be sufficiently countered.

(4) In some embodiments, in the configuration of any one of the above (1) to (3), the bumper beam has a bumper front ring located on the front side of the vehicle body with one end of the nut member joined thereto. A force and a bumper rear reinforcement that is joined to the rear side of the bumper front reinforcement and to which the holding member is joined.
According to the configuration of (4) above, the bumper beam is joined to one end of the nut member, joined to the bumper front reinforcement located on the front side of the vehicle body, and to the rear side of the vehicle body of the bumper front reinforcement. Since it includes the bumper reinforcement to which the members are joined, the rigidity of the bumper beam can be increased.

(5) In some embodiments, in any one of the configurations (1) to (4) described above, the bumper beam is provided on the front side of the vehicle body to reduce the impact of the pedestrian when the pedestrian collides. A core is provided, and the core has an insertion hole through which the pulling bolt is inserted.
According to the configuration of the above (5), the bumper beam is provided on the front side of the vehicle body and includes a core for reducing the impact of the pedestrian when the pedestrian collides, and the core has an insertion hole through which the traction bolt is inserted. To relieve pedestrian impact, traction bolts can be attached from the outside of the core.

  According to at least one embodiment of the present invention, predetermined collision energy can be absorbed.

1 is a diagram schematically showing an automobile to which a vehicle front structure according to an embodiment of the present invention is applied. It is the perspective view which looked at the front part structure of the vehicle concerning the embodiment of the present invention from the slanting front of the vehicle. FIG. 3 is a perspective view of the front structure of the vehicle shown in FIG. 2 as viewed obliquely from the rear of the vehicle. FIG. 4 is a cross-sectional view of the front structure of the vehicle shown in FIG. FIG. 4 is a perspective view of the bumper beam shown in FIG. 3 as viewed obliquely from the front of the vehicle body. It is the perspective view which looked at the holding member shown in FIG. 3 from the vehicle body diagonally back.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
In addition, for example, expressions representing shapes such as quadrangular shapes and cylindrical shapes not only represent shapes such as quadrangular shapes and cylindrical shapes in a strict geometric sense, but also within the range where the same effect can be obtained. A shape including a chamfered portion or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

  FIG. 1 is a diagram schematically showing an automobile 100 to which a vehicle front structure 1 according to an embodiment of the present invention is applied. FIG. 2 shows a vehicle front structure 1 according to an embodiment of the present invention. It is the perspective view seen from the vehicle diagonal front. 3 is a perspective view of the vehicle front structure 1 shown in FIG. 2 as viewed obliquely from the rear of the vehicle, and FIG. 4 is a cross-sectional view taken along line IV-IV of the vehicle front structure 1 shown in FIG. FIG. FIG. 5 is a perspective view of the bumper beam 5 shown in FIG. 3 as viewed obliquely from the front of the vehicle body. FIG. 6 is a perspective view of the holding member 7 shown in FIG.

  As shown in FIG. 1, a traction bolt 2 used when the automobile 100 is towed is attached to the vehicle front structure 1 according to the embodiment of the present invention.

  As shown in FIGS. 2 to 4, the vehicle front structure 1 according to this embodiment includes a pair of side members 3, a pair of crash boxes 4, a bumper beam 5, a nut member 6, and a holding member 7. Yes.

  As shown in FIG. 2, the pair of side members 3 are metal (steel) vehicle body members provided along the longitudinal direction of the vehicle body, and are provided on both sides of the vehicle body. Each of the pair of side members 3 is a rectangular tubular body member having a rectangular cross section, and has a rectangular flange 31 larger than the cross section of the side member 3 at the front end thereof. An opening 31 a communicating with the inside of the side member 3 is provided on the front surface of the flange 31. The opening 31 a is formed in, for example, an octagon slightly smaller than the cross section of the crash box 4.

  As shown in FIG. 3, the pair of crash boxes 4 are metal (steel) parts that are deformed at the time of a collision (mainly at the time of a frontal collision) to absorb the energy of the collision and ensure the safety of passengers. Thus, it is configured so as to be crushed with a predetermined energy or more from the front side of the vehicle body. The pair of crash boxes 4 are cylindrical members provided at the front end portions of the pair of side members 3, respectively, and have an octagonal cross section smaller than the cross section of the side members 3. The pair of crash boxes 4 has, for example, a plurality of grooves 41 (hereinafter referred to as “crash beads 41”) orthogonal to the longitudinal direction of the vehicle body, and one of the plurality of crash beads 41 is an accordion-like shape. It is comprised so that it may crush.

  As shown in FIG. 4, the bumper beam 5 is a metal (steel) vehicle body member installed inside the bumper 150 (see FIG. 1) in order to reduce vehicle body damage during a low-speed collision. Each of the crash boxes 4 is installed on a pair of crash boxes 4 at the front end portions thereof. Further, the bumper beam 5 is provided with a through hole 5 a for attaching the nut member 6.

  As shown in FIG. 5, the bumper beam 5 according to the present embodiment includes a bumper front reinforcement 51 installed on the front side in the vehicle longitudinal direction and a bumper rear force 52 installed on the rear side in the vehicle longitudinal direction. It is configured.

  The bumper front reinforcement 51 is a metal (steel) member having a groove-shaped cross section that is alternately recessed in the longitudinal direction of the vehicle body, and the nut member 6 is joined to the groove 51a provided at the center in the vertical direction of the vehicle body ( It is partially widened at the part to be welded (part where the through hole is provided). Further, as shown in FIG. 4, the portion to which the nut member 6 is attached is such that the portion 51a1 that is on the outer side in the vehicle width direction is on the front side in the vehicle longitudinal direction so that the axis of the nut member 6 is fixed along the vehicle longitudinal direction. It is bulging.

  The bumper reinforcement 52 is a metal (steel) member having a groove-shaped cross section in which both ends of the vehicle body in the vertical direction are bent rearward in the vehicle longitudinal direction. The bumper reinforcement 52 is superimposed on the bumper front reinforcement 51 and joined ( Welding). In the example shown in FIG. 5, both ends of the bumper reinforcement 52 in the vertical direction of the vehicle body (lip portion 52 b) are overlapped with both ends of the bumper front reinforcement 51 in the vertical direction of the vehicle body (lip portion 51 b). The center of the vehicle body in the vertical direction is joined (welded) to the bottom of a groove 51 a provided in the vehicle vertical direction center of the bumper front reinforcement 51.

  As shown in FIG. 4, the nut member 6 is a metal (steel) part for attaching the traction bolt 2, and penetrates through a through hole 5 a provided in the bumper beam 5 in the front area of the crash box 4. Thus, one end (front end) of the bumper beam 5 is fixed. The nut member 6 is a cylindrical member in which a female screw 6a is formed, and has a flange 61 on the front side (front end portion) in the front-rear direction of the vehicle body. As a result, the nut member 6 penetrating through the through hole 5a provided in the bumper beam 5 does not fall off to the rear side in the vehicle longitudinal direction. 4 and 5, the flange 61 of the nut member 6 is arc welded to the bumper beam 5 (bumper front reinforcement 51). In the example shown in FIG. 5, the flange 61 of the nut member 6 is arc-welded to the bumper beam 5 at four locations and the bead 62 appears on the front surface. However, the present invention is not limited to this. May be arc welded to the bumper beam 5.

  As shown in FIG. 5, the holding member 7 is a metal (steel) part for securing the mounting strength of the nut member 6, and is joined (welded) to the bumper beam 5. It is joined (welded) to the end (rear end). The holding member 7 has a bowl shape in which the cross section gradually decreases gradually from the front opening of the crash box 4 toward the other end (rear end) of the nut member 6, and the cross section is annular. is there.

  Further, as shown in FIG. 4, the holding member 7 has an edge portion 71 that forms a bowl-shaped periphery and is larger than the front opening of the crash box 4. The edge of the holding member 7 is sandwiched between the bumper beam 5 and the crash box 4 and joined to the bumper beam 5 (bumper reinforcement 52). In the example shown in FIG. 6, the rear end portion of the nut member 6 is arc welded to the holding member 7 on the entire circumference, and the bead 63 appears on the rear surface. However, the present invention is not limited to this. The rear end of 6 may be arc welded at a plurality of locations.

As shown in FIGS. 2 to 4, the vehicle front structure 1 according to this embodiment further includes a core 8 (hereinafter referred to as “E / A core 8”). The E / A core 8 is a metal (steel) part for reducing the impact of the pedestrian when the pedestrian collides, and is provided on the front side of the bumper beam 5 in the front-rear direction of the vehicle body. The E / A core 8 has a U-shaped groove shape with a recessed rear side in the longitudinal direction of the vehicle body, and the inner side of the upper edge of the vehicle body in the vertical direction is joined to the outer side of the upper edge of the bumper beam 5. Is joined to the outside of the lower edge of the bumper beam 5.
The E / A core 8 has an insertion hole 8a through which the traction bolt 2 is inserted. Thereby, the traction bolt 2 can be attached from the outside of the E / A core 8 that reduces the impact of the pedestrian.

  In the vehicle having the vehicle front structure 1 according to the embodiment of the present invention, the collision energy is transmitted in the order of the E / A core 8, the bumper beam 5, and the crash box 4 at the time of a collision (mainly a frontal collision). Thereby, the crash box 4 is crushed into an accordion shape using one of the plurality of crash beads 41 as a starting point. When the crash box 4 is completely crushed, the nut member 6 and the holding member 7 are retracted into the opening 31a provided on the front surface of the side member 3. As a result, the crash box 4 is crushed over the entire longitudinal direction (full length) of the vehicle body, so that the crash box 4 absorbs predetermined energy.

  According to the vehicle front structure 1 according to the embodiment of the present invention, the cylindrical holding member 7 whose cross section gradually decreases from the front opening of the crash box 4 toward the nut member 6 is joined to the bumper beam 5. At the same time, the nut member 6 and the holding member 7 are joined to the other end portion of the nut member 6, and the nut member 6 and the holding member 7 retreat to the opening 31 a provided on the front surface of the side member 3 when the crush box 4 is crushed. Thereby, the crash box 4 can absorb predetermined energy.

  Further, since the edge of the holding member 7 is sandwiched between the bumper beam 5 and the crash box 4 and joined to the bumper beam 5, the crash box 4 is not reinforced by the holding member 7. Thereby, the crash box 4 can absorb predetermined energy.

  Further, since the force acts equally on the holding member 7 from the nut member 6 to which the traction bolt 2 is screwed, the traction strength acting on the traction bolt 2 can be sufficiently countered.

  The bumper beam 5 includes a bumper front reinforcement 51 to which one end of the nut member 6 is joined, and a bumper rear reinforcement 52 to which the holding member 7 is joined while being joined to the bumper front reinforcement 51. Therefore, the rigidity of the bumper beam 5 can be increased.

The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
For example, the traction bolt 2 described above need not always be attached to the front structure 1 of the vehicle, and may be attached when the automobile 100 is towed. By doing in this way, it can be avoided that the traction bolt 2 becomes an obstacle to the predetermined energy absorption of the crash box 4.

DESCRIPTION OF SYMBOLS 1 Front structure 2 Towing bolt 3 Side member 31 Flange 31a Opening 4 Crash box 41 Crash bead 5 Bumper beam 5a Through hole 51 Bumper front reinforcement 52 Bumper reinforcement 6 Nut member 6a Female screw 61 Flange 62 Bead 63 Bead 7 Holding Member 71 Edge 8 E / A core 8a Insertion hole 100 Automobile 150 Bumper

Claims (5)

A pair of side members provided along the longitudinal direction of the vehicle body on both sides of the vehicle body;
A pair of crash boxes that are cylindrical members provided at the front end portions of the pair of side members, respectively, and are crushed with a predetermined energy or more from the front of the vehicle body
Bumper beams installed on the pair of crash boxes at the front end portions of the pair of crash boxes,
In the front region of the crash box, a nut member that has one end fixed to the bumper beam in a state of penetrating through a through hole provided in the bumper beam, and a traction bolt is screwed,
A saddle type whose cross section gradually decreases from the front opening of the crash box toward the other end of the nut member, and is joined to the bumper beam and joined to the other end of the nut member Members,
With
2. The vehicle front structure according to claim 1, wherein the side member has an opening on a front surface thereof to allow the nut member and the holding member to retreat when the crash box is crushed.   The holding member has an edge larger than the front opening of the crash box, which forms the periphery of the saddle shape, and the edge is sandwiched between the bumper beam and the crash box and joined to the bumper beam. The vehicle front part structure according to claim 1, wherein   The vehicle front structure according to claim 1 or 2, wherein the holding member has a circular cross section. The bumper beam is
One end of the nut member is joined, a bumper front reinforcement located on the front side of the vehicle body,
The vehicle front side according to any one of claims 1 to 3, further comprising: a bumper rear reinforcement that is joined to a vehicle body rear side of the bumper front reinforcement and to which the holding member is joined. Part structure. Provided on the vehicle body front side of the bumper beam, comprising a core for reducing the impact of a pedestrian when a pedestrian collides
The vehicle front structure according to any one of claims 1 to 4, wherein the core has an insertion hole through which the traction bolt is inserted.

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