JP5829886B2 - Bumper structure - Google Patents

Description

  The present invention relates to a bumper structure provided at the front and rear of a vehicle.

  Bumper structures are provided at the front end and rear end of a vehicle body such as an automobile to protect the vehicle body and the occupant by absorbing the impact when the vehicle collides.

  The bumper structure is provided between a bumper member (generally referred to as a bumper reinforcement) that is attached to the front end and the rear end of the vehicle so as to protrude forward and backward, and between the bumper member and the vehicle main body side. In order to absorb the impact, a so-called crash box is provided.

  The function of such a bumper structure is as follows. When the vehicle collides with an object, the bumper member receives the impact force, and the impact force received by the bumper member is efficiently transmitted from the bumper member to the impact absorption member. Protects the vehicle body and passengers.

  In order for the bumper structure to perform such a function, the bumper member is required to have a predetermined rigidity, and the shock absorbing member itself needs to be effectively deformed to absorb energy. The impact absorbing member needs to be attached so that the applied impact force is efficiently transmitted to the impact absorbing member.

  As an example of such a bumper structure, there is, for example, a bumper structure for a passenger car disclosed in Patent Document 1 shown below.

  The bumper structure for a passenger car disclosed in Patent Document 1 is composed of “a bumper reinforcing material made of an aluminum alloy hollow material and a stay provided on the rear surface of the bumper reinforcing material, and when a collision load is applied to the bumper reinforcing material, A bumper structure that absorbs collision energy by deforming the stay together with the bumper reinforcement, and is provided with a reinforcing member made of aluminum alloy having an open cross-sectional shape in a hollow space corresponding to the stay mounting position of the bumper reinforcement. The reinforcing member extends in the longitudinal direction of the bumper reinforcing material, and extends in the width direction of the bumper reinforcing material, and a pair of vertical wall-like flanges arranged substantially parallel to each other in the width direction of the bumper reinforcing material. And having a substantially U-shaped or substantially I-shaped cross-sectional shape composed of wall-shaped ribs connecting the pair of flanges. At least the vertical wall-shaped flange on the rear surface side is configured to be integrally joined with the stay and the bumper reinforcing material, and this reinforcing member is also deformed when a collision load is applied to the bumper reinforcing material and absorbs the collision energy The reinforcing member further includes a locking piece connected to an end of the vertical wall-shaped flange on the rear surface side and directed in the substantially same direction as the vertical wall-shaped flange, and the locking piece is A reinforcing member is inserted into the hollow space corresponding to the stay mounting position of the bumper reinforcement so as to be disposed on the rear surface side of the vertical wall-shaped flange on the rear surface side. The rear wall of the bumper reinforcement is sandwiched between the vertical wall-shaped flanges, and the stay is joined to the rear surface of the locking piece ”(see claim 1 of Patent Document 1).

JP 2010-89783 A

  In the bumper structure disclosed in Patent Document 1, the structure of the bumper reinforcement itself corresponding to the bumper member is complicated, and the stay corresponding to the shock absorbing member also has a complicated shape having flanges at both end faces. .

  Therefore, in order to simplify the structure of the bumper member and increase its rigidity, there is a bumper member provided with a convex reinforcing bead protruding in the thickness direction of the bumper (the front-rear direction with respect to the vehicle).

  In the case of such a bumper member, unevenness is formed on the surface to which the impact absorbing member is attached, and therefore it is difficult to attach the impact absorbing member made of a cylindrical body having both end faces as it is. Therefore, a conceivable mounting method is to install a reinforcing plate having an area larger than the area of the end face of the shock absorbing member and having a considerable thickness between the bumper member and the end face of the shock absorbing member. It is.

  However, when a reinforcing plate is installed, there are problems that the cost increases and the weight increases.

  The present invention has been made to solve such a problem, and while the bumper member is provided with a reinforcing bead, the impact force from the bumper member is efficiently applied to the shock absorbing member without increasing the weight. It is intended to provide a bumper structure that can be transmitted.

(1) A bumper structure according to the present invention includes a bumper member installed at a front end or a rear end of a vehicle, and a cylindrical impact absorbing member that is provided between the bumper member and the vehicle main body to absorb energy. And
The bumper member is provided with a reinforcing bead that protrudes toward the shock absorbing member installation side and extends in the longitudinal direction of the bumper member. The end face of the member is directly attached without interposing another member such as a reinforcing plate,
The reinforcing bead is formed in a convex shape with a plate member that constitutes a bumper member, and the vertical length of the surface of the reinforcing bead on the shock absorbing member mounting side is the same as the vertical length of the shock absorbing member. And the outer surface of the side wall of the impact absorbing member is set to be flush with the outer surface of the upper and lower walls protruding to the impact absorbing member mounting side of the reinforcing bead, and the transmission of the impact force is transmitted to the upper wall and the lower It smoothly flows directly from the wall to the side wall of the shock absorbing member.

( 2 ) Further, in the above (1 ), the length of the reinforcing bead protruding toward the impact absorbing member is set shorter than the length of the bumper member in the vehicle front-rear direction. Is.

  In the bumper structure according to the present invention, the bumper member is provided with a reinforcement bead that protrudes toward the shock absorbing member installation side and extends in the longitudinal direction of the bumper member, and the reinforcement bead includes wide portions at both ends thereof, Since the end face of the shock absorbing member is attached to the wide part, the bumper member is provided with a reinforcing bead, and the impact force from the bumper member is efficiently applied to the shock absorbing member without increasing the weight. Can communicate.

It is explanatory drawing explaining the principal part of the bumper structure which concerns on one embodiment of this invention. It is a figure which shows the state seen from the direction of the arrow in FIG. It is explanatory drawing explaining the effect | action of the bumper structure which concerns on one embodiment of this invention. It is explanatory drawing of the other aspect of the bumper structure which concerns on one embodiment of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

A bumper structure 1 according to the present embodiment includes a bumper member 3 installed at a front end or a rear end of a vehicle, and a cylindrical impact that is provided between the bumper member 3 and the vehicle main body to absorb energy. And an absorbing member 5.
Hereinafter, each member and its mounting structure will be described in detail.

<Bumper material>
As shown in FIGS. 1 and 2, the bumper member 3 has a substantially U-shaped cross section in the axial direction of the bumper member 3 and has an outer flange 7 on the top and bottom. A convex reinforcing bead 9 that protrudes toward the vehicle main body side, that is, the side to which the shock absorbing member 5 is attached, is formed in the U-shaped vertical piece of the bumper member 3 over the entire length in the longitudinal direction of the bumper member 3. The reinforcing bead 9 is formed by bending a vertical piece of the bumper member 3.

  The reinforcing beads 9 have wide end portions 9a at both ends in the longitudinal direction, and the shock absorbing member 5 is attached to the wide portion 9a.

  The bumper member 3 according to the present embodiment forms a reinforcement bead 9 in the vicinity of the center portion, and further forms a wide portion 9a at both ends of the reinforcement bead 9, thereby ensuring the necessary rigidity as the bumper member and absorbing the shock. The member 5 can be directly attached.

  In addition, the center part vicinity in the bumper member 3 in which the reinforcement bead 9 is formed means that it may be in the middle of the bumper member 3 or may be slightly shifted.

  As shown in FIG. 1, the reinforcing bead 9 has an U-shaped cross section orthogonal to the axial direction. Further, as shown in FIG. 2, when the depth of the bumper member 3 (distance in the vehicle longitudinal direction) is D1, and the depth of the reinforcing bead 9 is D2, D1 ≧ D2. More specifically, the relationship is D1 = D2 + D3, and the end surface of the reinforcing bead 9 on the vehicle side is ahead of the bumper member 3 by a distance D3 (in the case of the bumper structure 1 provided at the front of the vehicle). ) Or rear (in the case of the bumper structure 1 provided at the rear of the vehicle). As a result, the length of the shock absorbing member 5 that protrudes toward the vehicle side is longer than that in the case where the reinforcing plate is attached to the upper and lower outer flanges 7 of the bumper member 3 and the end surface of the shock absorbing member 5 is brought into contact with the reinforcing plate. If the distance is the same, the distance of the shock absorbing member 5 can be set longer by the distance D3, and the energy absorbing power of the shock absorbing member 5 can be increased. In other words, if the length of the shock absorbing member 5 is the same, the protruding length of the shock absorbing member 5 toward the vehicle can be shortened by the distance D3, and as a result, the total length of the vehicle can be shortened.

<Shock absorbing member>
The impact absorbing member 5 of the present embodiment is a rectangular cylindrical body. The end surface of the shock absorbing member 5 is in direct contact with the wide portion 9a of the reinforcing bead 9 without interposing another member such as a reinforcing plate. This is because the wide part 9 a is formed in the reinforcing bead 9 so that an area where the end surface of the shock absorbing member 5 can directly abut can be secured.

  As shown in FIG. 2, the upper and lower side walls 11 of the shock absorbing member 5 and the upper wall 13a and the lower wall 13b of the reinforcing bead 9 are installed so that the center lines of both walls are in a straight line. Since the center lines of both walls are in a straight line, the impact force acting on the bumper member 3 is efficiently transmitted to the impact absorbing member 5 via the reinforcing beads 9.

In the bumper structure 1 configured as described above, the impact force acting on the bumper member 3 is transmitted to the shock absorbing member 5 through the reinforcing beads 9 as indicated by arrows in FIG. At this time, transmission of force smoothly flows from the upper wall 13a and the lower wall 13b of the reinforcement bead 9 directly to the side wall 11 of the shock absorbing member 5. As a result, the shock absorbing member 5 is originally deformed, and can efficiently absorb the impact energy.
This is because the side wall 11 of the shock absorbing member 5 and the upper wall 13a and the lower wall 13b of the reinforcing bead 9 are arranged so as to be continuous in the force transmission direction.

  As described above, according to the bumper structure 1 of the present embodiment, the bumper member 3 has a simple structure but retains the rigidity that should be originally provided, and the bumper structure 1 as a whole is reduced in weight and efficient energy. Absorption ability can be demonstrated.

  In the above embodiment, the upper wall 13a and the lower wall 13b of the reinforcing bead 9 of the bumper member 3 and the side wall 11 of the shock absorbing member 5 are shown in such an example that their center lines coincide with each other. However, the present invention is not limited to this.

  That is, if the impact force flows smoothly from the upper wall 13a and the lower wall 13b of the reinforcing bead 9 of the bumper member 3 to the side wall 11 of the shock absorbing member 5, the upper wall 13a and the lower wall 13b of the reinforcing bead 9 The side wall 11 of the shock absorbing member 5 may be displaced. The allowable range of the deviation will be described in detail below.

  First, as one preferred embodiment, as shown in FIG. 4A, the outer surface of the upper wall 13a and the lower wall 13b of the reinforcing bead 9 and the outer surface of the side wall 11 of the shock absorbing member 5 are flush with each other. It is.

  As another preferred embodiment, as shown in FIG. 4 (b), the material of which the outer surface of the side wall 11 of the shock absorbing member 5 constitutes the bumper member 3 from the outer surface of the upper wall 13a and the lower wall 13b of the reinforcing bead 9 is used. It is an aspect which is arrange | positioned inside within the range of the distance 5t of 5 times the plate | board thickness t.

DESCRIPTION OF SYMBOLS 1 Bumper structure 3 Bumper member 5 Shock absorbing member 7 Outer flange 9 Reinforcement bead 9a Wide part 11 Side wall 13a Upper wall 13b Lower wall

Claims (2)

A bumper member installed at the front end or the rear end of the vehicle, and a cylindrical impact absorbing member that is provided between the bumper member and the vehicle main body side and absorbs energy;
The bumper member is provided with a reinforcing bead that protrudes toward the shock absorbing member installation side and extends in the longitudinal direction of the bumper member. The end face of the member is directly attached without interposing another member such as a reinforcing plate,
The reinforcing bead is formed in a convex shape with a plate member that constitutes a bumper member, and the vertical length of the surface of the reinforcing bead on the shock absorbing member mounting side is the same as the vertical length of the shock absorbing member. And the outer surface of the side wall of the impact absorbing member is set to be flush with the outer surface of the upper and lower walls protruding to the impact absorbing member mounting side of the reinforcing bead, and the transmission of the impact force is transmitted to the upper wall and the lower A bumper structure that smoothly flows directly from a wall to a side wall of the shock absorbing member. The bumper structure according to claim 1, wherein a length of the reinforcing bead protruding toward the impact absorbing member is set to be shorter than a length of the bumper member in the vehicle front-rear direction.

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