DE102008029634A1 - Bumper for use at main chassis beam of passenger car, has deformation element and/or retainer attached with front side of inner surface of outer- or pressure belt and fused with bumper - Google Patents

Abstract

The bumper (40) has a deformation element formed as a retainer (60) and attached to the bumper. Profile walls are arranged in a distance to each other as an outer- or pressure belt (44) and/or as an inner- or traction belt (44i). The deformation element is formed as a hollow profile with side walls (62), which connect cross walls (66). The deformation element and/or the retainer are attached with a front side (68) of an inner surface (42) of the outer- or pressure belt, and are fused with the bumper.

Description

The The invention relates to a bumper with at this attached deformation elements or brackets for its attachment on a vehicle - especially on side rails of a passenger car -, being at a distance from each other arranged as outer or pressure belt or as inner or Zuggurt Profile walls and a pair of these molded transverse and flank walls form the bumper, according to the generic term of the Patent claim 1. Those designed as a hollow profile bumper Otherwise, if necessary, at least in the area of the brackets opposite a transverse plane of the longitudinal axis of the vehicle be formed arched.

Such a bumper is the DE 102 09 721 A1 to be taken from the applicant. In this bumper, the brackets are each designed as a hollow profile of two side walls and two adjoining these transverse walls with a longitudinal member associated mating portion of the hollow profile and bolted to the bumper. The hollow profile of the bumper may optionally be executed arched at least in the region of the brackets relative to a transverse plane of the longitudinal axis of the vehicle.

With the DE 298 23 973 U1 particularly lightweight bumpers are proposed, which are reinforced in heavily loaded areas by an additional profile. In this case, the reinforcing profile can also consist of a part of a holding device for the bumper. In the latter case, the side walls of the holding device expand conically and come into contact with the profile strips of the bumper, applied to the inner profile wall of the reinforcing profile and the holding device is then screwed.

These serve bumpers designed according to the state of the art to ward off larger impact forces such as colliding two vehicles and are generally relatively large.

at a bolted corner joint between an aluminum extruded profile designed bumper crossbeam and a deformation element slips according to experience high load between the latter and the cross member the Connection. But if you weld the deformation element dull the cross member, it rips in the area the weld as a heat-affected zone at strong Deformation or bending of the cross member on or off.

In Knowing these facts, the inventor set himself the goal a bumper of the type mentioned above create a stable connection between the bumper or the hollow profile and the associated holders produced.

to Solving this task leads the doctrine of the independent claim; the dependent claims give favorable Further education. In addition, all fall within the scope of the invention Combinations of at least two in the description, the drawing and / or the features disclosed features. At specified Naming ranges should also be within the limits mentioned lying values are disclosed as limits and can be used arbitrarily be.

According to the invention the deformation element or the holder with an end face the inner surface of the outer or pressure belt assigned - interspersed So the inner or Zuggurt -, and it is with the bumper welded. It has proven to be beneficial that the holder the inner or Zuggurt the bumper interspersed.

Of the Zuggurt of the bumper is so in the field of Connection punched to the deformation element and the latter in the bumper so opened up to its exterior. or pressure belt inserted. Then it will be on the vehicle center pointing side with that inner belt in the transverse direction and on the Vehicle outside in the longitudinal direction with transverse walls the bumper welded. Special Meaning the welds in the longitudinal direction, as they bend the bumper or cross member do not tear down. In addition, through them remains the Outside of the deformation element free of heat affected zones. Abkragungen the bumper up and down prevent its tearing during bending operations.

The Insertion of the deformation element into the bumper can be done so far that the end face of the inner surface of the bumper is applied. However, it is also possible the end face of the holder at a small distance from the inner surface to arrange the bumper.

To the Insertion of the deformation element or the holder goes from the front face of the bumper one Recess of the inner or Zuggurtes, between the two transverse or flank walls and extends at one between these extending end edge of the inner or Zuggurtes ends, which is a lateral stop element for the holder forms. The latter is made by welds with her facing surfaces of the transverse walls of the cross member and / or connected to the surface of the inner or Zuggurtes, so welded.

In the context of the invention, it is also that the holder or the deformation element a Passed through the center bar, which is integrally formed with the bumper parallel to the transverse walls. The center bar should preferably extend in the contact region of the end face of the holder as a residual strip of small cross-section.

In a particular embodiment of the invention is the central web one of the two transverse walls of the holder at a small distance i. w. allocated in parallel; Determine center bar and adjacent transverse wall while a reinforcing area of the bumper. Bumpers or cross member and bracket or Deformationselement can according to the invention a or more chambers. At bumper with several chambers can its stability by moving that middle bar and increasing it locally increase the wall thicknesses in the impact area.

According to the invention on an embodiment of the holder in the region of a front side a trained as a hollow profile connection profile - preferably axially formed - provided, the height of the distance the two transverse or flank walls of the associated bumper and its Kraglänge the width of the bumper equivalent.

To this embodiment of the holder to the cross member be formed so that it has two closed outer Chambers as well as one in the direction of the connection to the vehicle opened Chamber contains. The deformation element can also be an or capture several middle chambers whose height is the height corresponds to the open chamber of the cross member. The middle chamber of the deformation element is on the length, by which it is to be plugged into the cross member through mechanical machining exposed. Cross member and deformation element are welded. The Anschussprofil is therefore in a open chamber of the bumper inserted, the on both sides in each case a closed chamber is assigned.

The closed chamber is according to the invention of a Transverse wall of the bumper and a molded Gutter profile limited. In addition, one of the stop profile in distance from the front edge outgoing front edge of the deformation profile assigned to the gutter profile of the bumper and with the Outer surface of its inner profile belt welded be.

• • Das auch als Crashbox bezeichnete Deformationselement 60, 60_a wird bis zur Vorderkante des Trägers bzw. bis 10 mm davor in den Querträger eingesteckt; dadurch ergibt sich die Möglichkeit, Deformationselement und Querträger in Längsrichtung zu verschweißen, um die Stabilität zu erhöhen.
• • Der Querträger wird in einem Bruchgurt mit Abkragungen nach oben und unten verstärkt, um seine Biegesteifigkeit zu verbessern.
• • Es erfolgt ein Aufdicken der Wandstärke des Querträgers im Aufschlagbereich eines Impaktors durch ein Verschieben des Mittelsteges in diesem Bereich; dies geschieht, um den Querträger lokal zu verstärken.

This results in the following special features:

• • The deformation element, also referred to as Crashbox 60 . 60 _a is inserted into the cross member up to the front edge of the beam or 10 mm in front of it; This results in the ability to weld deformation element and cross member in the longitudinal direction to increase the stability.
• • The cross member is reinforced in a break belt with up and down overhangs to improve its flexural rigidity.
• • There is a thickening of the wall thickness of the cross member in the impact area of an impactor by moving the central web in this area; this is done to strengthen the cross member locally.

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments as well as from the drawing; this shows in

1 FIG. 2 is a plan view of a bumper with prior art mounts of different design at both ends of the bumper for attachment to a side member; FIG.

2 : an oblique view of part of the bumper 1 with bracket;

3 : an oblique view of a part of a bumper according to the invention, and on one side of a projecting deformation element;

4 : an oblique view of another side of the deformation element of the bumper according to the invention with a view of a connection from the inside;

5 : the oblique view of the bumper without deformation element;

6 . 7 two representations of the local reinforcement of another cross member as a function of the relative position of the cross member to an impactor;

8th : an oblique view of a connection with a three-chamber deformation element as well

9 : the exposed middle chamber of the deformation element.

An aluminum alloy extruded bumper 10 a not reproduced for reasons of clarity passenger car has according to 1 two at a distance from each other extending profile walls 14 . 16 on, by flank walls 18 to a box-shaped hollow profile 12 are supplemented. The latter is associated with a transverse to the vehicle longitudinal axis A at right angles extending transverse plane E and both sides of the here forming a plane of symmetry vehicle longitudinal axis A to that transverse plane E evenly curved out; the hollow profile 12 determines for this towards and to the longitudinal axis A a parallel and in distance to the latter decreasing curvature k. In Mounting position forms the side facing away from the transverse plane E outer profile wall 14 a - impact forces receiving - outer or compression belt and the other profile wall 14 an inner or a tension belt.

In the profile interior 22 of the hollow profile 12 is integral with the profile walls 14 . 16 as well as the connecting these flank walls 18 one - parallel to the profile walls 14 . 16 directed - transverse wall 21 with one each between this and the profile walls 14 . 16 extending middle wall 23 intended. These middle walls 23 are each side by side offset.

The two front edges 20 the bumper 10 is in each case a vehicle longitudinal member 30 assigned, which runs parallel to the vehicle longitudinal axis A. These vehicle side members 30 each consist of two parallel side walls 26 and these connecting transverse walls 27 composed of an interior 28 of the vehicle longitudinal member 30 limit. In 2 is the second sidewall 26 not shown for reasons of clarity.

Near the front edges 20 of the hollow profile 12 are in 1 Examples of tubular deformation organs 32 indicated by a profile piece, on the one hand on the inner profile wall 16 attached and at the other end with a plug-in section 32a in the vehicle side member 30 is used. For example, this is made of a light extruded extruded profile element deformation element 32 near the left front edge 20 of the hollow profile 12 at the bumper 10 bevelled end facing; the resulting inclined edge 33 of the profile element 32 determines with the transverse plane E an angle w of for example 10 °.

One at the right end of the bumper 10 in 1 indicated another embodiment of the connection of the hollow profile 12 to the vehicle side member 30 is in detail the 2 refer to. It is clear here that serving as the outer belt profile wall 14 both transverse or flank walls 18 with wing-like wall sections as edge strips 15 . 15 _t overlaps.

The connection of the hollow profile 12 to the vehicle side member 30 is here by a from a - in turn extruded from an aluminum alloy - hollow profile of a height h as a holding member 36 produced. On which the Fahrzuglängsträger 30 assigned and screwed in this plug-in section 34 of the hollow profile 36 the holder closes a curvature section 38 at. In the 2 right side wall is curved outwards and the other side wall endward brought to this so that both side walls lie on each other and each of the two transverse walls is folded approximately in the middle. In this case, the inner curve contour corresponding to the outer surface of the inner profile wall 16 of the hollow profile 12 , ie it includes with a parallel to the transverse plane E the mentioned angle w.

The two-ply legs of the resulting trough-like curvature section 38 are in the range of - in the drawing unrecognizable - breakthroughs of screws 31 od. The like. Connecting organs interspersed, which also in bumper-side openings of the flank walls 18 intervention. Corresponding openings for connecting organs are in the plug-in section 34 of the holding member 36 intended; These connecting members store in the vehicle longitudinal member 30 in breakthroughs 29 ,

An inventive connection of a cross member 40 a bumper to a deformation element 60 clarifies 3 , From the inner surface 42 a curved in plan view outside or profile belt 44 of the crossbeam 40 protrude at short intervals n to the longitudinal edges 45 and at a clear distance q to each other transverse walls 46 the collar length f ( 5 ) off and between these a Mittelsteg 48 who in 5 is clearly visible. An inner profile belt 44 _i connects the transverse walls 46 on the other hand, surmounting it with a strip-like upper edge 45 _i low altitude.

The inner profile or front belt 44 _i of the cross transfer 40 as well as the - if available - middle bar 48 be in the area of the connection to the deformation element 60 punched out so that - like 5 represents - a rectangular recess 50 of length e, whose height corresponds to that distance q of the transverse walls 46 equivalent. Opposite of the front edge 12a of the crossbeam 40 outgoing recess 50 runs on the inner surface 42 of the outer belt 44 a leftover strip 48 _a small cross section of the central web 48 ; the latter starts at the side edge 52 the recess 50 ,

The deformation element 60 is in the recess thus prepared 50 of the crossbeam 40 towards the inner surface 42 of the outer belt 44 - For example, at a distance of 30 mm to 0.1 mm, preferably 10 mm - or to the inner surface 42 from the outer profile strap 44 or until that leftover strip 48 _a plugged in and pointing to the vehicle center, in 4 recognizable side edge 52 the recess 50 applied; the side edge 52 thus forms a stop element. The deformation element 60 is then in its transverse direction with the inner belt 44 _i through welds 58 as well as with the surfaces 47 the transverse walls 46 of the crossbeam 40 through welds 56 in the longitudinal direction of the deformation element 60 welded.

Of particular importance are the perspiration sewed 56 in the longitudinal direction, as they bend the cross member 40 do not tear down. In addition, through them, the outside of the so-called. Crashbox free of heat affected zones. The Abkragungen of the cross member 40 up and down with the mentioned longitudinal edges 45 . 45 _i prevent it from tearing when bent.

deformation element 60 and crossbeams 40 may contain one or more chambers. At a crossbeam 40 with several chambers can its stability by moving the center bar 48 and locally improve by increasing the wall thicknesses in the impact area, as discussed further below.

The deformation element 60 is preferably of rectangular cross-section, at the height h ₁ in 4 it in his by Querwänden 62 connected side walls 64 each centrally a gutter molding 66 having. Near the front edge 68 of the deformation element 60 is its interior 70 preferably of two transverse tubes 71 interspersed, which pairings of mutually aligned breakthroughs 72 in the side walls 64 connect, between which a cross-sectionally approximately U-shaped transverse rib 69 can be arranged.

In various crash tests - which are prerequisites for road legal approval of a vehicle - there is always the height of the so-called impactor as a barrier or standardized impact element - in 6 . 7 indicated at Q - standardized. Depending on the design of the vehicle but varies the height of the bumper cross member 40 because its total height q ₁ by the height of the side members 30 is predetermined. To achieve the highest possible rigidity of the cross member in the collision with the impactor Q guided in the direction of impact x in the crash test 40 to achieve that will be in 6 . 7 continuous middle bridge 48 in the ladder-like cross-section of the cross member 40 positioned so that it is in the impact level or at the height of the impact point. In addition, the wall thicknesses z of the outer belt in the impact area 44 and inner profile belt 44 _i increases, as in the range P of 6 . 7 is indicated; at P, the wall thicknesses z are in the wall section 43 between the continuous middle bridge 48 and the transverse wall adjacent at a distance t 46 (in 5 : below; in 6 : above) significantly increased.

The crossbeam 40 _a of the 8th . 9 is designed so that it has two closed outer chambers 74 at the cross-sectional ends and one in the direction of the connection to the vehicle - over the entire length of the cross member 40 _a - open chamber 76 contains. The closed chambers 74 collar at a vertical distance y from each other from the outer profile belt 44 and limit with the profile transverse walls 46 as a chamber floor, the open chamber 76 , Each to the profile transverse walls 46 and the profile belt 44 molded polygonal channel profiles 78 cover the two closed chambers 74 from.

In the open chamber 76 is a connection profile 80 the height y and the width b of a deformation element 60 _a inserted. Its Kraglänge k ₁ corresponds to the cross-sectional depth of the open chamber 76 of the deformation element 60 _a whose width b is the width of the connection profile 80 pretends. However, the latter height y is shorter than the height y _{1 of} the deformation element 60 _a , The height difference is created by two further chambers 79 whose front edges 79 _a in installation position 8th the parts of the inner profile belt forming inner walls 75 abut and with these, for example, by welding 58 are connected in the transverse direction. That connection profile 80 can by welds 56 in the longitudinal direction of the transverse walls 46 as a crossbeam 40 _a be attached.

The deformation element 60 has one or more central chambers in the connection profile 80 whose height is the height of the open chamber 76 of the crossbeam 40 _a equivalent. The connection profile 80 of the deformation element 60 gets to a length around it in the cross member 40 _a is to be inserted, exposed by mechanical processing. crossbeam 40 _a and deformation element 60 are welded.

• • Höheres Kraftniveau und somit höhere Energieaufnahme bei gleichem Gewicht;
• • beim Biegen des Querträgers 40, 40_a können die in Längsrichtung positionierten Schweißnähte 56 hohe Lasten aufnehmen;
• • die Außenseiten der Deformationselemente 60, 60_a sind frei von Wärmeeinflusszonen.
• • Das frühzeitige Kollabieren des Querträgers 40, 40_a wird verhindert.
• • Der Querträger 40, 40_a kollabiert nicht im Anbindungsbereich.
• • Die Krafteinleitung erfolgt direkt auf das Deformationselement 60, 60_a .

Amongst others, the following advantages result from the steps according to the invention:

• • Higher strength level and thus higher energy intake with the same weight;
• • when bending the cross member 40 . 40 _a can be the longitudinally positioned welds 56 take high loads;
• • the outsides of the deformation elements 60 . 60 _a are free of heat affected zones.
• • The early collapse of the crossbeam 40 . 40 _a will be prevented.
• • The cross member 40 . 40 _a does not collapse in the connection area.
• • The force is applied directly to the deformation element 60 . 60 _a ,

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10209721 A1 [0002]
• - DE 29823973 U1 [0003]

Claims (18)

Bumpers with attached to this deformation elements as brackets for its attachment to a vehicle, in particular to longitudinal members of a passenger car, spaced apart as outer or compression belt or as inner or Zuggurt arranged profile walls and a pair of these molded transverse or flank walls the bumper form and the deformation element is designed as a hollow profile with side walls and these connecting transverse walls, characterized in that the deformation element or the holder ( 60 . 60 _a ) with an end face ( 68 ) of the inner surface ( 42 ) of the outer or compression belt ( 44 ) and with the bumper ( 40 . 40 _a ) is welded. Bumper according to claim 1, characterized in that the holder ( 60 . 60 _a ) the inner or Zuggurt ( 44 _i ) of the bumper ( 40 . 40 _a ) interspersed. Bumper according to claim 1 or 2, characterized in that the end face ( 68 ) of the inner surface ( 42 ) of the bumper ( 40 . 40 _a ) is present. Bumper according to claim 1 or 2, characterized in that the end face ( 68 ) of the holder ( 60 ) at a small distance to the inner surface ( 42 ) of the bumper ( 40 ) runs. Bumper according to one of claims 1 to 4, characterized in that the holder ( 60 . 60 _a ) a central web ( 48 ), which is parallel to the transverse walls ( 46 ) is formed. Bumper according to claim 4 or 5, characterized in that the middle web ( 48 ) in the contact area of the end face ( 68 ) of the holder ( 60 ) as leftover strip ( 48 _a ) of small cross section ( 5 ). Bumper according to claim 6, characterized in that the middle web ( 48 ) one of the two transverse walls ( 46 ) is assigned at a small distance (t) ( 7 ). Bumper according to claim 5, characterized in that middle web ( 48 ) and adjacent transverse wall ( 46 ) a reinforcement region (P) of the bumper ( 40 . 40 _a ). Bumper according to one of claims 1 to 8, characterized in that from its end face ( 12 _a ) a recess ( 50 ) of the inner or Zuggurtes ( 44 _i ), which extends between the two transverse or flank walls ( 46 ) and at an extending therebetween front edge ( 52 ) of the inner or Zuggurtes ends. Bumper according to claim 9, characterized in that the front edge ( 52 ) as a lateral stop edge for the holder ( 60 ) is trained. Bumper according to one of claims 1 to 10, characterized in that the holder ( 60 . 60 _a ) by welds ( 56 . 58 ) with their facing surfaces ( 47 ) of the transverse walls ( 46 ) of the cross member ( 40 . 40a ) and / or with the surface of the inner or Zuggurtes ( 44 _i ) connected is. Bumper according to one of claims 1 to 11, characterized in that on the holder ( 60 _a ) in the region of a front side designed as a hollow profile connection profile ( 80 ) whose height (y) is the distance between the two transverse or flank walls ( 46 ) of the assigned bumper ( 40 _a ) corresponds ( 9 ). Bumper according to claim 12, characterized in that the connection profile ( 80 ) axially to the holder ( 60 _a ) is formed. Bumper according to claim 13, characterized in that the cantilever length (k ₁ ) of the connection profile ( 80 ) of the holder ( 60 _a ) the width of the bumper ( 40 _a ) corresponds. Bumper according to claim 13 or 14, characterized in that the connection profile ( 80 ) in an open chamber ( 76 ) of the bumper ( 40 _a ) is inserted, which on both sides in each case a closed chamber ( 74 ) assigned. Bumper according to claim 15, characterized in that the closed chamber ( 74 ) from a transverse wall ( 46 ) of the bumper ( 40 _a ) as well as a molded gutter profile ( 78 ) is limited. Bumper according to claim 16, characterized in that one of the stop profile ( 80 ) at a distance (k ₁ ) from its front edge ( 68 ) outgoing front edge ( 79 _a ) of the deformation profile ( 60 _a ) the gutter profile ( 78 ) of the bumper ( 40 _a ) and with the outer surface of its inner profile belt ( 44 _i ) is welded ( 8th ). Bumper after at least one the preceding claims, characterized by at least another feature disclosed in the drawings and / or description.