JP4751901B2 - Automotive bumper equipment - Google Patents

Description

The present invention relates to an automobile bumper device that efficiently absorbs impact energy against a frontal collision including an oblique direction and a pole collision and has an improved bumper stay.

  A bumper device for an automobile includes a bumper beam (also referred to as a bumper inhose) that extends in the width direction of the vehicle body and is disposed in front (and rearward) of the vehicle, and a side frame that extends in the front-rear direction on both sides of the vehicle body And a bumper stay that is disposed between the bumper beam and fixes the bumper beam to the side frame.

  The bumper beam is made of an aluminum alloy extruded shape or a pressed steel plate, and its cross-sectional shape is often U-shaped, B-shaped, Sun-shaped or eye-shaped. A structure comprising a hollow main body fixed to a bumper beam and a mounting piece integral with the main body has been proposed (see Japanese Patent Application Laid-Open No. 2000-344029).

In Japanese Patent Laid-Open No. 2000-344029, as shown in FIG. 8, a pair of projecting pieces 102, 102 are extruded on the rear surface of the hollow bumper beam 101 integrally with the main body 104 of the bumper beam 101, and the projecting pieces 102, 102 are formed. The bumper beam 101 is configured by cutting away the necessary mounting pieces 103 and 103.
Folded pieces 105 and 105 are formed at one end of the hollow bumper stay 106.

  The bumper stay 106 is attached to the bumper beam 101 by inserting the end of the bumper stay between the attachment pieces 103 and 103 and joining the attachment pieces 103 and 103 to the bumper stay 106 by friction stir coupling. Further, the folded pieces 105 and 105 of the bumper stay are joined to the flange portion 108 of the side frame 107 by friction stir coupling.

JP 2000-344029 A

In the bumper device of the conventional example, after the bumper beam 101 is extruded, a substantial part of the projecting pieces 102 and 102 must be cut off. In addition, it is necessary to cut off a part of the opposite side portion of the bumper stay 106 in order to produce the folded pieces 105 and 105 of the bumper stay.
Such a cutting operation affects the dimensional accuracy of the bumper and deteriorates the yield.

In the joining of the bumper stay and the side frame, the folded pieces 105, 105 are friction stir coupled to the flange portion 108 of the side frame 107, but there is a problem in the rigidity of this portion. Weld cracks occur at the joints, reducing energy absorption at the time of collision.
Furthermore, the friction stir coupling portion between the mounting pieces 103 and 103 and the bumper stay 106 is cracked when the vehicle collides in an oblique direction, and an improvement is desired.

  Therefore, this invention makes it the subject which should be solved to eliminate the malfunction of the prior art mentioned above.

In order to solve the above-described problems, the present invention uses technical means for welding front and rear mounting brackets to the front and rear end faces of the bumper staple and fixing the bumper staple to the bumper beam and the side frame.
Preferably, the mounting bracket has a pair of flanges that sandwich the end face of the bumper staple, and uses technical means for welding the bumper staple and the mounting bracket through the flange.

  By adopting this basic technical means, it is possible to weld the necessary portions on both the upper and lower sides of the bumper stay and to which the impact load is applied at the time of the collision of the vehicle.

  According to the present invention, a bumper beam extending in the vehicle width direction of an automobile, and a bumper stay disposed between a side frame of the vehicle body and each end portion of the bumper beam, the bumper stay extending in the longitudinal direction of the side frame. A main body portion made of a hollow member, a front mounting bracket welded to the end surface of the main body portion on the bumper beam side, and a rear mounting bracket welded to the end surface of the main body portion on the side frame side. An automotive bumper device is provided in which a rear mounting bracket is fixed to a side frame, the rear mounting bracket has a pair of flanges, and an outer wall surface of a body part of a bumper stay is sandwiched between the pair of flanges.

Preferably, the flange of the rear mounting bracket and the outer wall surface are welded except for the central portion thereof.
More preferably, the front mounting bracket has a flat portion along the rear surface of the bumper beam, and an inclined surface that is continuous with the flat portion and separates from the rear surface of the bumper beam, and the flat surface and the inclined surface are A flange for holding the outer wall surface of the main body portion is provided, and the flange and the outer wall surface are welded.

The bumper stay according to the present invention makes a movement of deforming the mounting bracket at the time of a vehicle collision, and at that time, it can be improved so as to eliminate the stress concentration portion, and cracking can be suppressed.
Mounting is easy because the mounting bracket is welded to the front and rear end faces of the bumper staple, and the bumper staple with the mounting bracket welded is fixed to the bumper beam and the side frame.

  Bolt insertion holes for mounting the front mounting bracket and the bumper beam are provided in the position corresponding to the hollow part of the bumper stay, and bolt insertion holes for mounting the rear mounting bracket and the side frame are provided outside the position corresponding to the hollow part of the bumper stay. This makes it possible to avoid stress concentration and cracking in the weld.

As shown in FIG. 2, an automobile bumper device 1 includes a bumper beam 2 extending in the vehicle width direction of an automobile, a side frame 3 positioned on both sides of the vehicle body, and bumper stays disposed between both ends of the bumper beam 2. 4, a front mounting bracket 5, and a rear mounting bracket 6.
A bumper beam (also referred to as a bumper inhose) 2 is made of an extruded shape of an aluminum alloy, and a cross-section of a known hollow shape such as a Japanese character shape, an eye shape, or a rice field shape is used.

  Although the shape of the side frame 3 is not particularly limited, for example, as shown in FIG. 6, a plate member 7 and a hollow member 8 having a channel-shaped cross section are joined in the illustrated example.

The bumper stay 4 is made of a hollow extruded shape of an aluminum alloy. In the illustrated example, a bumper stay 4 having a square cross section is used. Extruded sections having other cross-sectional shapes may be used.
A front mounting bracket 5 is welded to the front end surface of the bumper stay 4. The front mounting bracket 5 is made of a plate-like aluminum alloy extruded shape, and its height is substantially equal to the height of the bumper stay 4, and projecting piece-like flanges 9 are provided on both sides thereof.

  The front mounting bracket 5 has a flat portion 10 along the rear surface of the bumper beam 2 and an inclined surface 11 separated from the rear surface to the rear, and is a flat portion 10 and a pair of bolt insertion holes at a position corresponding to the hollow portion of the bumper stay 4. 12 is provided. A nut (not shown) is set in the bolt insertion hole 12.

The front mounting bracket 5 further has a protruding piece 14 having a side bolt insertion hole 13.
The front mounting bracket 5 and the bumper stay 4 are joined at their upper and lower parts by continuous welds 15, and their left and right side parts are joined by intermittent welds 16 and 17 that are missing at the center. The welds 16 and 17 are effective in avoiding distortion generated in each member due to welding.

  The installation of the inclined surface 11 reduces the contact surface between the front mounting bracket 5 and the bumper beam 2, reduces the transmission area of the load from the bumper beam 2 to the bumper stay 4 at the time of vehicle collision, and the load becomes particularly large at the initial stage of the collision. In addition, the deformation that occurs so as to collapse from the tip of the bumper stay 4 proceeds in a stable manner in the backward direction. In the illustrated example, the ratio between the flat portion 10 and the inclined surface 11 is approximately 1/3 of the width of the bumper stay 4 as an inclined surface, but this ratio is preferable for reducing the impact load. At the time of collision, the inclined surface 11 comes into contact with the rear surface of the bumper beam 2 along with the bumper stay 4 to increase the pressure receiving area.

The rear mounting bracket 6 has projecting piece-like flanges 18 and 18 into which the rear end of the bumper stay 4 is inserted. The rear end portion of the bumper stay 4 is inserted between the flanges 18 and 18, the upper and lower portions thereof are joined by continuous welds 19 and 19, and the left and right side portions thereof are joined by intermittent welds 20 and 21 with the center portion missing. Let
The welded portion 19 may not be provided to the full width of the bumper stay 4 but only the central portion.

The rear mounting bracket 6 has a dimension higher than the height of the bumper stay 4, and has a pair of bolt insertion holes 22, 22 between the flanges 18 and 18 and at the upper and lower positions of the bumper stay 4.
A projecting piece 23 is provided on one side of the rear mounting bracket 6, and a pair of bolt insertion holes 24, 24 are provided on the projecting piece 23 in the vertical direction.
In the example of FIG. 1, recesses 25 are provided on the upper and lower edges of the rear mounting bracket 6.

  The rear mounting bracket 6 is attached to the side frame 3 by passing a bolt (not shown) through the side frame through the bolt insertion holes 22 and 24 and tightening a nut (not shown).

  4 to 7 show another example of the present invention. In this example, the bumper beam 2 and the bumper stay 4 are the same as those shown in FIGS. 1 to 3, but the rear mounting bracket 6 ′ is a protruding piece 23 of the rear mounting bracket 6 used in the example of FIG. It is the structure which excised.

  The rear mounting bracket 6 ′ is mounted on the side frame 3 by bolting the rear mounting bracket 6 ′ to the base plate 26 fixed to the end of the side frame 3. The base plate 26 has fixed pieces 27, and these fixed pieces 27 are welded or bolted to the upper and lower walls of the side frame 3 (see FIG. 7).

  The rear mounting bracket 6 ′ has a deflection of the flange 18 due to the fact that the projecting piece 23 and the side frame 3 are not fixed to the side frame 3 by using the bolt insertion hole 24 compared to the example of FIG. As a result, stress concentration on the welded portions 20 and 21 is reduced, and breakage of the welded portions can be further prevented.

It is a perspective view of the bumper stay used for the bumper device of the present invention. It is a top view of an example of the present invention. It is a side view of an example of the present invention. It is a perspective view of another example of this invention. FIG. 5 is a perspective view of a bumper stay used in the example of FIG. 4. It is sectional drawing seen from the arrow VI-VI of FIG. It is sectional drawing seen from the arrow VII-VII of FIG. It is a perspective view of the conventional bumper apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper apparatus 2 Bumper beam 3 Side frame 4 Bumper staple 5, 6 Mounting bracket 9, 18 Flange 10 Flat part 11 Inclined surface 12, 13, 22, 24 Bolt insertion hole 15, 16, 17, 19, 20, 21 Welded part 25 Recessed part

Claims (5)

A bumper beam extending in the vehicle width direction of the automobile, and a bumper stay disposed between the side frame of the vehicle body and each end portion of the bumper beam,
The bumper stay has a main body portion made of a hollow member extending in the longitudinal direction of the side frame, and a front mounting bracket welded to the end surface of the main body portion on the bumper beam side,
The said front mounting bracket is secured to the bumper beam, and a flat portion to which the front mounting member is in contact with the rear surface in contact with the rear surface I along and the main body portion end face me along the body portion end surface of the bumper beam side of the bumper beam, the the inclined surface in contact with the body end surface I along the body portion end surface of the bumper beam side as well as away from the continuous and the rear surface of the bumper beam integrally with the flat portion, of the vehicle width direction of the flat portion and the inclined surface A pair of flanges that are formed in a protruding piece shape from an end portion toward the side frame and are welded to the outer wall surface by holding the outer wall surface of the main body portion ;
Said body portion automotive bumper system having said collapsed portion being on the outer wall surface thus defined of said body part end surface and said body portion, wherein the pair of flanges Komu added along the flat portion and the inclined surface. The front mounting bracket includes a bolt insertion hole located between the pair of flanges and inside the body part of the bumper stay, and a bolt insertion hole located outside the one body part and outside the body part of the bumper stay. The automobile bumper device according to claim 1 , comprising: Before SL front mounting bracket, bolt located outside of the main body portion of the bolt insertion hole is located inside the main body of the and a between pairs of flanges bumper stay, and a is the outside towards the one flange bumper stay The bumper device for automobiles according to claim 1 which has a hole. It said one flange, said a part of the flat portion, automobile bumper system according to claim 2 or 3. The flat portion has a protruding piece at a position opposite to the inclined surface,
2. The automobile bumper device according to claim 1, wherein the projecting piece has a bolt insertion hole located outside the main body of the bumper stay.

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