JP5067493B1 - Bumper device for vehicle - Google Patents

Abstract

A vehicular bumper device is provided that can alleviate damage to a collided body during a collision.
A bumper beam 30 is attached to side members 11 and 12 which are skeleton members at the front portion of the vehicle via crash boxes 20 and 21. A bumper core member 31 is disposed on the front side of the bumper beam 30. The bumper beam 30 and the bumper core member 31 extend in the vehicle width direction. Side members 35 and 36 are provided at both ends of the bumper core member 31 in the vehicle width direction. Each of the side members 35 and 36 includes a front end portion 35a fixed to the bumper beam 30 and an extending portion 35c extending from the front end portion 35a to the vehicle rear side. At least a part of the extending part 35c overlaps the end face 30c in the vehicle width direction of the bumper beam 30 when viewed from the side of the vehicle.
[Selection] Figure 1

Description

  The present invention relates to a vehicular bumper device disposed in a front portion of a vehicle.

  In a vehicle bumper device mounted on the front part of a vehicle such as a passenger car, a bumper beam is fixed to the front end of a skeleton member such as a side frame extending in the front-rear direction of the vehicle, and an impact intended to protect pedestrians on the front side of the bumper beam It is known that a buffer member is arranged and the outside is covered with a vehicle body panel such as a bumper face. For example, in a vehicle bumper device disclosed in Patent Document 1, a shock-absorbing member made of a sheet metal having a substantially U-shaped cross-section is arranged on the front surface of a bumper beam. By collapsing, the collision energy is absorbed and the impact given to the collision object (pedestrian or the like) is reduced.

JP 2008-137611 A

  By the way, since the shock-absorbing member as disclosed in Patent Document 1 is open at both ends in the vehicle width direction, the both ends tend to be less rigid than the other portions. Further, due to the structure, there is a possibility that the impact due to deformation (buckling) of the impact buffer member cannot be sufficiently absorbed, and the impact on the collision target (pedestrian or the like) may be increased. The deformation state of the end portion of the shock absorbing member at the time of a conventional collision will be specifically described with reference to FIGS. 8 (A) and 8 (B).

  8A and 8B show the impactor test before and after deformation when the impacted body (impactor) 5 is applied to the vicinity of the end of the shock absorbing member (bumper core member) 3 whose both ends are open. Indicates the state. The bumper device 1 includes a bumper beam 2 and a sheet metal shock absorbing member (bumper core member) 3 disposed on the front side of the bumper beam 2, similarly to the configuration disclosed in Patent Document 1. The bumper beam 2 is fixed to the front end of the side member 4 extending in the front-rear direction of the vehicle. In the bumper device 1, as shown in FIG. 8A, the collision target (impactor) 5 collides with the end portion of the impact buffer member (bumper core member) 3 in the vehicle width direction (vehicle width direction). Suppose.

  As shown in FIG. 8B, when the impacted body (impactor) 5 collides with the end 3a of the shock absorbing member (bumper core member) 3, the end 3a is bent toward the vehicle rear side and at the same time in the vehicle width direction. Move towards. As the deformation progresses, the end 3a is in a state of facing the vehicle front-rear direction. For this reason, the impacted member (impactor) 5 cannot be received by the impact buffering member (bumper core member) 3, and the impacted body (impactor) 5 is attached to the bumper beam 2. That is, since the impacted body 5 (impactor) hits the bumper beam 2 before the impact is sufficiently absorbed by the impact buffering member (bumper core member) 3, the impact value applied to the impacted body (impactor) 5 may be increased. there were.

  This problem can be solved to some extent by extending the end 3a (tip 3b) of the shock absorbing member (bumper core member) 3 to the outer side in the vehicle width direction than the bumper beam 2. However, since the shock absorbing member (bumper core member) 3 is disposed inside the bumper face having a predetermined length according to the vehicle body design, the end 3a of the shock absorbing member (bumper core member) 3 is extended outward in the vehicle width direction. It was difficult to do.

  Accordingly, an object of the present invention is to provide an impact cushioning member that can sufficiently absorb the load at the time of collision and alleviate the damage received by the impacted object even in the event of collision at both ends in the vehicle width direction of the bumper device. An object of the present invention is to provide a vehicle bumper device.

  The present invention includes a bumper beam attached to the front end of a skeleton member at the front of a vehicle and extending in the vehicle width direction, a bumper core member extending in the vehicle width direction along the front surface of the bumper beam, and both ends of the bumper core member in the vehicle width direction And a side member provided in the section. The bumper core member forms a hollow portion that is open at both ends in the vehicle width direction between the bumper core member and the bumper beam. The side members are arranged so as to extend to the rear side of the vehicle and at least partially overlap with both end surfaces of the bumper beam in the vehicle width direction on the outer side in the vehicle width direction.

  The bumper core member according to one embodiment of the present invention includes a front portion facing the vehicle front side, and an upper surface portion and a lower surface portion that extend from the upper and lower end edges of the front surface portion to the vehicle rear side and are coupled to the bumper beam. With. The side member extends from the both ends of the front surface in the vehicle width direction to the vehicle rear side so as to close the hollow portion, and the rear end portion is disposed outside the end surface of the bumper beam in the vehicle width direction.

  In one embodiment of the present invention, the bumper beam, the bumper core member, and the side member are each made of sheet metal, and the thicknesses of the bumper core member and the side member are smaller than the thickness of the bumper beam. Ribs extending in the front-rear direction of the vehicle may be formed on the side member.

  According to the present invention, when a collision load is input to the end portion in the vehicle width direction of the bumper core member, the end portion of the bumper core member is deformed so as to be bent inward in the vehicle width direction. To the end surface of the bumper beam, and then moves rearward of the vehicle while deforming so that the rear end of the side member opens outward in the vehicle width direction as the bumper core member is deformed. For this reason, a side member becomes resistance, it can suppress that the edge part of a bumper core member deform | transforms rapidly inside a vehicle width direction, and can collide collision energy reliably by deform | transforming a side member simultaneously. Therefore, since bottoming due to a collision object (pedestrian or the like) hitting the bumper beam can be avoided, the impact value given to the collision object (pedestrian or the like) can be reduced even at the end of the bumper core member. In addition, since the side member is deformed so as to open outward in the vehicle width direction, the side member does not enter the inside of the bumper core member to prevent buckling of the core member. Can be generated.

The disassembled perspective view of the bumper device for vehicles concerning one embodiment of the present invention. The front view of the principal part of the bumper apparatus shown by FIG. The perspective view of the edge part of the principal part of the bumper apparatus shown by FIG. The side view of the principal part of the bumper apparatus shown by FIG. FIG. 5 is a cross-sectional view taken along F5-F5 in FIG. 2 schematically showing a state of deformation of the bumper core member by the impactor test, and (A) shows a state immediately before the collision object collides with the end of the bumper core member. , (B) show the deformation state at the initial stage of the collision. (A), (B) is sectional drawing which followed F5-F5 in FIG. 2 which showed typically the deformation | transformation state of the bumper core member by an impactor test, and each shows the state in the middle of a deformation | transformation of a bumper core member. (A), (B) is sectional drawing which followed F5-F5 in FIG. 2 which showed the deformation | transformation state of the bumper core member by an impactor test typically, (A) is a bumper core member from the state of FIG. Furthermore, the state which deform | transformed is shown, (B) shows the state which the deformation | transformation of the bumper core member was complete | finished. (A), (B) is sectional drawing which showed typically the state before and behind a deformation | transformation of the edge part of a bumper core member at the time of performing an impactor test in the conventional bumper apparatus.

  Hereinafter, a vehicle bumper device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

  FIG. 1 is an exploded perspective view of the bumper device 10. FIG. 2 is a front view of the bumper device 10 as viewed from the front of the vehicle. The bumper device 10 is provided on the vehicle front side of a pair of left and right side members 11 and 12 that are skeleton members disposed at the front of the vehicle. In FIG. 1, the direction indicated by the arrow X is the vehicle longitudinal direction, and the direction indicated by the arrow Y is the vehicle width direction (vehicle width direction). A front end cross member 13 that is a skeleton member extending in the vehicle width direction is provided between the front end portions of the side members 11 and 12.

  The side members 11 and 12 extend in the front-rear direction of the vehicle. Crash boxes 20 and 21 are fixed to members (end plates) 15 and 16 provided at the front ends of the side members 11 and 12, respectively. The crash boxes 20 and 21 are configured to absorb the collision energy by being compressed and deformed and buckled when an emergency collision load is input from the front of the vehicle. The crash boxes 20 and 21 are detachably fixed to the members 15 and 16 on the side members 11 and 12 side by bolts 25 (shown in FIGS. 2 and 4). Ribs 26 (shown in FIG. 3) are formed on the side surfaces of the crash boxes 20 and 21 in order to optimize the rigidity against buckling and the like.

  The bumper device 10 includes a bumper beam 30 attached to the front ends of the crash boxes 20 and 21, a bumper core member 31 that functions as an impact buffer member disposed along the front surface (front side of the vehicle) of the bumper beam 30, and a vehicle including the bumper core member 31. And side members (core side members) 35 and 36 provided at both ends 31a and 31b in the width direction.

  The bumper beam 30 is formed by connecting a front panel 30a positioned on the front side of the vehicle and a rear panel 30b positioned on the rear side of the vehicle by spot welding or the like, and forms a closed cross section. The bumper beam 30 and the bumper core member 31 both extend in the vehicle width direction. The bumper beam 30, the bumper core member 31, and the side members 35 and 36 are all made of weldable sheet metal (for example, structural steel plate). The thickness of the bumper core member 31 and the side members 35 and 36 is smaller than the thickness of the bumper beam 30.

  The bumper core member 31 has a front surface portion 40 facing the vehicle front side, an upper surface portion 41, a lower surface portion 42, a rear end flange portion 43, and the like. The upper surface portion 41 and the lower surface portion 42 extend from the upper and lower end edges of the front surface portion 40 toward the vehicle rear side, and are coupled to the bumper beam 30 via rear end flange portions 43 formed at the respective rear end edges. It is like that. The bumper core member 31 forms a hollow portion 45 that is open at both ends in the vehicle width direction between the bumper core member 30 and the bumper beam 30.

  Further, ribs 48 for adjusting the bending rigidity of both end portions 31a and 31b are formed in the vicinity of both end portions 31a and 31b in the vehicle width direction of the bumper core member 31 (in the vicinity of the side members 35 and 36). Since the side members 35 and 36 are configured separately from the bumper core member 31, ribs 48 having a desired shape are formed by pressing at both end portions 31a and 31b of the bumper core member 31 (in the vicinity of the side members 35 and 36). Is possible. A bumper face member 50 made of synthetic resin is provided on the vehicle front side of the bumper core member 31. The bumper core member 31 is disposed inside the bumper face member 50.

  FIG. 3 shows one end 31 a and one side member 35 of the bumper core member 31. Since the other end portion 31b of the bumper core member 31 and the other side member 36 have the same configuration, the following description will be made on behalf of the one end portion 31a of the bumper core member 31 and the one side member 35.

  The side member 35 of the present embodiment includes a front end portion 35a located on the front side of the vehicle, a slant portion 35b extending from the front end portion 35a to the vehicle rear side, and an extending portion 35c extending from the slant portion 35b to the vehicle rear side. And have. The front end portion 35a is fixed to the front surface portion 40 of one end portion 31a in the vehicle width direction of the bumper core member 31 by a fixing portion W (shown in FIG. 3) such as spot welding. The oblique portion 35b is formed between the front end portion 35a of the side member 35 and the extending portion 35c. The oblique portion 35b has a shape that extends obliquely outward in the vehicle width direction from the front side of the vehicle toward the rear side of the vehicle when viewed from above the vehicle.

  FIG. 4 is a side view of the bumper device 10. As shown in FIG. 4, at least a part of the rear end side (front end 35 e side) of the extending portion 35 c is disposed so as to overlap the end surface 30 c in the vehicle width direction of the bumper beam 30 on the outer side in the vehicle width direction. That is, the side member 35 is extended from the vehicle width direction both ends of the front surface portion 40 of the bumper core member 31 to the vehicle rear side so as to close the hollow portion 45, and the rear end side thereof is the vehicle width direction of the end surface 30 c of the bumper beam 30. Arranged outside. A rib 52 extending in the front-rear direction of the vehicle is formed on the extending portion 35c. The rib 52 optimizes the bending rigidity of the extending portion 35c.

  Hereinafter, the operation of the vehicular bumper device 10 having the above-described configuration will be described with reference to FIGS. 5 (A) to 7 (B).

  FIG. 5A is a cross-sectional view schematically showing a case where an impacted body (impactor) 60 collides from the front of the vehicle toward the end of the bumper device 10 in the vehicle width direction in the impactor test. is there. As shown in FIG. 5B, when the collision object 60 collides with the end 31a in the vehicle width direction of the bumper core member 31, the end 31a of the bumper core member 31 starts to deform toward the vehicle rear side at the initial stage of deformation. The side member 35 also starts moving toward the vehicle rear side following the end 31a of the bumper core member 31. The deformation state of the end portion 31a of the bumper core member 31 can be adjusted by the rib 48 provided on the end portion 31a.

  When the collision progresses, as shown in FIG. 6A, the end 31a of the bumper core member 31 is further deformed and bent toward the rear side of the vehicle by being pushed by the collision target 60, so that the end 31a is also formed inside the vehicle. Start moving. Following this, the extension part 35c of the side member 35 is pulled inward of the vehicle while moving to the vehicle rear side, so the surface 35d of the extension part 35c is in contact with the end face 30c of the bumper beam 30. .

  Then, as shown in FIG. 6B, the extended portion 35c of the side member 35 moves to the rear side of the vehicle while sliding in a state of being in contact with the end face 30c of the bumper beam 30. For this reason, it is suppressed that the edge part 31a and the front-end | tip 31c of the bumper core member 31 deform | transform into a vehicle inner side rapidly. That is, the side member 35 prevents the bumper core member 31 from being deformed to the vehicle inner side.

  Next, when the collision further proceeds, as shown in FIG. 7A, the end 31a of the bumper core member 31 is further moved toward the vehicle inner side while being deformed further toward the vehicle rear side by being pushed by the collision object 60. Along with this, the extended portion 35c of the side member 35 is slid under a state of being in contact with the end face 30c of the bumper beam 30, and the distal end 35e of the extended portion 35c starts to deform so as to open outward in the vehicle width direction.

  Then, as shown in FIG. 7B, the extending portion 35c of the side member 35 is further deformed while receiving the colliding body 60, and finally the colliding body 60 hits the bumper beam 30 together with the extending portion 35c. The extension portion 35c is obliquely deformed toward the outer side in the vehicle width direction, so that the collision energy is absorbed. It is possible to adjust the deformation of the side member 35 so as to obtain a desired energy absorption effect by optimizing the size, cross-sectional shape, and the like of the rib 52 formed in the extending portion 35c.

  In this way, the side member 35 abuts against the end surface 30c of the bumper beam 30 to suppress deformation toward the inside of the vehicle, and the side member 35 is deformed to absorb the collision energy, so that the end portion 31a of the bumper core member 31 is suddenly It is possible to avoid bottoming due to deformation of the impacted body 60 against the front surface of the bumper beam 30, and it is possible to suppress a sudden rise in load.

  In addition, since the extended portion 35c of the side member 35 is slidable along the end surface 30c of the bumper beam 30, it is possible to suppress the extended portion 35c from buckling in the middle of deformation, and a sudden rise in load due to buckling can be achieved. Can be avoided. Furthermore, since the tip 35e of the extending portion 35c of the side member 35 is deformed so as to open outward in the vehicle width direction, the side member 35 enters between the end portion 31a of the bumper core member 31 and the bumper beam 30, and the bumper core member The buckling of 31 is not inhibited. Therefore, the collision energy can be effectively absorbed by the deformation of the end portion 31 a of the bumper core member 31 and the side member 35.

  As described above, according to the bumper device 10 of the present embodiment, it is possible to mitigate the damage that the collision target 60 receives in the event of a collision.

  In the above-described embodiment, the side members 35 and 36 are configured separately from the bumper core member 31. However, as another embodiment, the side members are integrally formed at both ends of the front surface portion 40 of the bumper core member 31. It may be a single object. In carrying out the present invention, various specific forms such as the shape and arrangement of each element constituting the bumper device, including the specific shape of the bumper beam, the bumper core member, the side member, the vehicle frame member, etc., are variously changed. Needless to say, this can be done.

  DESCRIPTION OF SYMBOLS 10 ... Bumper apparatus, 11, 12 ... Side member (skeleton member), 20, 21 ... Crash box, 30 ... Bumper beam, 31 ... Bumper core member, 35, 36 ... Side member, 35a ... Front end part, 35b ... Slanted part, 35c ... extension part, 45 ... hollow part, 48, 52 ... rib.

Claims (4)

A bumper beam attached to the front end of the skeleton member at the front of the vehicle and extending in the vehicle width direction;
A bumper core member that extends in the vehicle width direction along the front surface of the bumper beam and forms a hollow portion that is open at both ends in the vehicle width direction between the bumper beam;
Side members that are provided at both ends of the bumper core member in the vehicle width direction and that extend to the rear side of the vehicle so that at least a part thereof overlaps both end surfaces of the bumper beam in the vehicle width direction on the outer side in the vehicle width direction;
A bumper device for a vehicle, comprising: The bumper core member includes a front portion facing the vehicle front side, and an upper surface portion and a lower surface portion that extend from the upper and lower end edges of the front surface portion to the vehicle rear side and are coupled to the bumper beam,
The side member is extended to the vehicle rear side so as to block the hollow portion from both ends of the front surface in the vehicle width direction, and a rear end portion thereof is disposed outside the end surface of the bumper beam in the vehicle width direction. The bumper device for vehicles according to claim 1 characterized by things.   The bumper beam, the bumper core member, and the side member are each made of sheet metal, and the plate thickness of the bumper core member and the side member is smaller than the plate thickness of the bumper beam. Bumper device for vehicles.   The vehicular bumper device according to any one of claims 1 to 3, wherein a rib extending in a longitudinal direction of the vehicle is formed on the side member.

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