DE102005043707A1 - Optimized impact system for 10 ° load - Google Patents

Abstract

The subject of the present invention relates to an impact absorption system (10), in particular for a motor vehicle, for an impact oblique to a longitudinal axis (A) of the motor vehicle, in particular in the front region of the motor vehicle, comprising: a cross member (11) to absorb the impact, one with the Cross member (11) via a connecting device (20) connected crash box (12) for energy absorption of the energy transmitted by the impact via the cross member (11) and a motor vehicle frame (13) connected to the crash box (12), in particular a motor vehicle front car frame, the connecting device (20) has means for absorbing at least part of the energy acting on the motor vehicle frame (13) due to the impact, in order to cause plastic deformations of the motor vehicle frame (13) caused by the impact, in particular on the side of the motor vehicle frame (13) facing away from the impact reduce or avoid.

Description

The The present invention relates to an impact absorption system, in particular for a motor vehicle, for one to a motor vehicle longitudinal axis oblique impact, in particular in the front region of the motor vehicle, comprising: a crossbeam, um to absorb the impact, one with the cross member via a connecting device connected crash box, for energy absorption by the impact of the crossbeam forwarded energy and one connected to the crash box Motor vehicle frame, in particular a Kraftfahrzeugvorderwagenrahmen.

such Systems are used in almost all motor vehicles to any eventuality Impacts for example in accidents dampen and thus to minimize repair costs in case of damage and the Protect motor vehicle occupants.

Numerous impact attenuation devices or units for motor vehicles are known. From the EP 0 473 955 B1 is an impact attenuation device, in particular for motor vehicles, comprising a deformation damper comprising a sliding tube and a deformation piston slidably displaced therein in the direction of its central longitudinal axis, the sliding tube having inwardly directed, deformable projections in the form of substantially parallel to Provided center longitudinal axis extending wicks, against which the deformation piston is supported, known.

Next is from the DE 198 32 114 A1 an impact absorber for motor vehicles is known, wherein the impact damper has an outer support tube and a displaceable in this deformation tube. Further, a reversible impact damper with a displaceable, over the free end of the support tube protruding cylindrical housing and a reversibly damped in the housing displaceably guided piston rod, which is connected to the deformation tube at least in the insertion direction provided. A deforming device with a formed on the support tube to the axis protruding reinforced projection is provided. The impact damper is characterized in that the free end of the deformation tube protrudes with a guide portion over the free end of the support tube opposite to the insertion direction and the housing is guided displaceably in the guide portion.

From the DE 199 42 167 A1 a vehicle impact-damping unit is known, wherein the impact-damping unit for motor vehicles comprises a damper having a first damper component (housing) and a second damper component (piston rod) which is displaceable relative to the first damper component. The first damper component has a first fastening element, and a second fastening element is connected to the second damper component. There is provided a locking device for selectively establishing and releasing a connection between the second damper member and the second fastening element.

Finally, out of the DE 200 13 385 U1 an impact-damping unit for motor vehicles known. This impact-damping unit comprises at least one damper, a first damper component (deformation tube), which has at least one longitudinal slot in an insertion direction and at one end of the longitudinal slot has a recess whose diameter is greater than the width of the longitudinal slot and with a relative to the first damper component (deformation tube) in the insertion direction displaceable second damper component (locking and deformation element) is provided and a locking device for selectively establishing and releasing a connection between the first damper member and the second damper member, the a transversely movable to the insertion direction, designed as a locking and deformation element latch with an unlocking pin, whose diameter is smaller than the width of the longitudinal slot and with a locking and deformation section whose diameter corresponds approximately to the recess and is significantly larger as the width of the longitudinal slot and a latch actuator.

The above-mentioned impact-damping units or impact-damping devices all have the disadvantage that they are designed for an impact substantially in the direction of the vehicle longitudinal axis. Thus, for example, an oblique impact with these units or devices can not be optimally damped. These devices or devices are usually designed according to the specifications of an insurance crash test, which includes an impact at about 16 km / h partially covered against a rigid wall. The impact-damping units must absorb a large portion of the kinetic energy, so that the underlying vehicle structure remains undamaged and thus the vehicle get a corresponding type damage rating. The entire devices, which are listed above, but are not designed for a new so-called 10 ° load, the impact is carried out 10 ° obliquely to the motor vehicle longitudinal axis. With this new 10 ° load, the front end structures of motor vehicles are subjected to significantly less favorable loads. Due to the oblique component of the initiated by the impact Force comes to plastic deformation in the front frame at worst, even on the side facing away from the impact of the front frame.

task The present invention is therefore an impact absorption system to create, which is the new load case, the previously existing damping systems can continue to be used.

These Task is based on an impact absorption system according to the preamble of claim 1 in conjunction with the characterizing hereafter Characteristics solved. Advantageous developments of the invention are specified in the dependent claims.

The Invention shoots the technical doctrine that in an impact absorption system the connecting device between the cross member and Crashbox means for Absorption of at least part of the impact by the impact Motor vehicle frame has acting energy to through the Impact induced plastic deformation of the motor vehicle frame, in particular on the side facing away from the impact of the motor vehicle frame reduce or avoid.

The Means are each additional or subsequently can be introduced into existing systems. The funds take one Part of the impact energy. Preferably, the agents take the transverse to the vehicle longitudinal axis acting energy share.

connecting devices can all facilities which are suitable, a crash box with a cross member, which also designed as a bumper can be to connect. Preferably, the connection is fixed, so that it can not be solved unauthorized.

These solution offers the advantage that by the means which in addition to existing crash box are arranged, the relatively small proportion the transverse to the longitudinal axis acting energy is absorbed and the greater part as before by the crashbox is being recorded. Thus, can be easily a retrofit or to realize an adaptation to the new load case.

Prefers is that the means are designed as a slot-connection means combination, relative to a substantially force-free movement of the cross member to realize the crashbox. By the movement of the cross member is a cheaper one Load case allows. Since in the given load case only one side of the cross member - that is partially covered - charged is, moves the cross member on the loaded side in the direction of the motor vehicle longitudinal axis to the rear part of the motor vehicle, wherein the motor vehicle cross member due the connection by means of slot this movement at the not with the impact loaded side allows. Here's the movement in the slot, that is the connecting means in the slot, substantially force-free, this means there is no material deformation.

Further Favor is that the means formed as a shear-lanyard combination are relative to a forceful displacement of the cross member to realize the crash box with energy absorption. To this Way, a movement is allowed as quoted above, where additionally through the shear track and the associated forceful displacement of the crossbeam or the connecting agent takes place an additional energy absorption.

Yet more preferred is that the connecting means as a screw, Pin, and / or riveting are formed to connect the crashbox and the crossbeam to realize. An advantage of the connection is that the connecting means the on the cross member attached slots or penetrate shearing marks. For example, this permeates as Screw formed connecting means which also penetrates the cross member slot. Thus, the cross member when force in the region of the connecting means in the slot movable or movable. By training as a screw, pin and / or rivet is both a translational and a rotational as well a combined movement of both possible.

Also Favor is that the means are adapted to an oblique impact which preferably in an angular range of ≥ 0 ° to ≤ 20 °, further preferably from ≥ 5 ° to ≤ 15 °, and most preferably from ≥ 8 ° to ≤ 12 ° in relation on the motor vehicle longitudinal axis is, and preferably by 10 °. With this arrangement can the forces occurring in the new load case are absorbed, without that the vehicle structure or the vehicle frame to the impact opposite side is deformed.

In addition, it is preferred that the slot and / or the shear track is formed substantially transversely to the motor vehicle longitudinal axis, in order to allow a movement of the connecting means and thus a movement of the cross member substantially transversely to the motor vehicle longitudinal axis. Due to this design, the cross member may yield on one side and follow the movement on the other side, resulting in a more favorable for the front frame structure load case, which a Deformation of the vehicle structure, in particular of the front frame at a 16 km / h impact, partially covered under 10 ° prevented.

It It is also preferred that the shearing blade be substantially in Direction of motor vehicle longitudinal axis tapered, a forceful movement of the connecting means and thus of the crossbeam transverse to the vehicle longitudinal axis to enable. In the one-sided impact, the cross member moves away from the middle of the vehicle longitudinal axis. Thus, the connecting means migrates within the shear track Center of the cross member out. By the rejuvenating Arrangement, the material is deformed by the connecting means, because the rejuvenation from a range a smaller inner dimension than the outer dimension of Having bonding agent, and there is a plastic deformation, which continues to absorb energy. By this energy absorption becomes predominantly the transverse to the longitudinal axis acting part of the impact energy absorbed.

It is also preferred that the cross member in two places symmetrical to the motor vehicle longitudinal axis each with a crash box over each connecting device is connected. Because of this symmetrical Arrangement leaves allow optimal energy absorption.

Further the invention improving measures are in the subclaims or together with the description below several preferred embodiments of the invention with reference to the figures shown in more detail. Show it:

1 a schematic plan view of an inventive energy absorption system with a schematically illustrated 10 ° load in the undeformed state;

2 shows schematically the top view of an energy absorption system in both undeflected and loaded and deformed load case with an enlarged view, which shows the movement of the connecting device schematically and

3 another embodiment of the connecting device with a slot-connecting means combination represents.

In 1 is an energy absorption system according to the invention 10 shown. The energy absorption system 10 includes a cross member 11 , a crashbox 12 and a motor vehicle frame 13 , The crossbeam 11 or also bumper is designed as an elongated carrier and extends substantially transversely to a vehicle longitudinal axis A. At its end regions is the cross member 11 via a connecting device 20 with the crashbox 12 connected. The crashbox 12 is again fixed to the motor vehicle frame 13 connected. Also shown is the 10 ° load case, wherein the acting energy is shown schematically by the arrow F. This symbolizes the acting force on the energy absorption system. The oblique force, which is here approximately 10 ° incidence force is drawn relative to the motor vehicle longitudinal axis A, in turn, in a horizontal component - represented here by an arrow with the name X - and a vertical component - shown here by an arrow with the name Y - break down. The X component gets completely through the crashbox 12 added. The Y-component acts in particular on the side facing away from the impact and is also shown there by an arrow with the designation Y. This force effect can without the inventive energy absorption system 10 are not absorbed and thus leads to deformation on the area of the motor vehicle frame shown in the ellipse 13 , The mode of action of the energy absorption system according to the invention 10 is schematically more accurate in 2 shown.

2 shows the energy absorption system 10 in a position before the load case and in a deflected position after the load case. When applying an energy or a force, represented here by the arrow labeled F, the cross member can 11 due to the special design of the connection device 20 move with energy absorbing agents. This takes place on the side at which the impact takes place, in the direction of the vehicle longitudinal axis A and partly transversely to the motor vehicle longitudinal axis A. The movement transversely to the motor vehicle longitudinal axis A takes place essentially on the side facing away from the impact. Shown here is the connection device 20 with means which is designed as a shear-lanyard combination. This may be the cross member 11 move transversely to the vehicle longitudinal axis A to the outside on the side facing away from the impact. As a result, the imaginary connection point migrates between connecting means 30 and shearing track 50 relative to the shear gauge 50 further inward, ie in the direction of motor vehicle longitudinal axis A. By this movement energy is absorbed, which is done by the material that the shear track 50 immediately bounded, plastically deformed, that is deformed, becomes. As a result of this deformation, the component of the energy acting transversely to the longitudinal axis A of the motor vehicle, here marked by Y, is canceled out, which is symbolized by a transverse line through the arrow on the side facing away from the impact. The magnification shown shows how the crossbeam 11 moved on the side facing away from the impact transversely to the vehicle longitudinal axis to the outside, and thereby the connecting means 30 relative to the shear gauge 50 moved further in the direction of the vehicle's longitudinal axis.

3 shows a further embodiment of the means for energy absorption. These are designed here as a slot-screw connection. It thus finds no material deformation of the slot 40 surrounding material, allowing a force-free displacement of the cross member 11 analogous to 2 is possible. The slot 40 is substantially transverse to the vehicle longitudinal axis in the cross member 11 educated. The formed as a screw connecting means 30 penetrates the cross member 11 within the longitudinal bore or the slot 40 , The crashbox 12 In particular, absorbs the forces in the direction of the motor vehicle longitudinal axis.

10

Impact absorption system

11

crossbeam

12

crash box

13

Motor vehicle frame

20

connecting device

30

connecting means

31

bolt, Pen, riveting agent

40

Long hole

50

shear track

A

Motor vehicle longitudinal axis

Claims (8)

Impact absorption system ( 10 ), in particular for a motor vehicle, for an impact oblique to a motor vehicle longitudinal axis (A), in particular in the front region of the motor vehicle, comprising: a crossbeam ( 11 ) to absorb the impact, one with the cross member ( 11 ) via a connection device ( 20 ) connected crash box ( 12 ), for the energy absorption of the impact of the cross member ( 11 ) forwarded energy and one with the crash box ( 12 ) associated motor vehicle frame ( 13 ), in particular a motor vehicle front carriage frame , characterized in that the connecting device ( 20 ) Means for absorbing at least part of the impact caused by the impact on the motor vehicle frame ( 13 ) has energy acting in order to prevent plastic deformations of the motor vehicle frame caused by the impact ( 13 ), in particular on the side facing away from the impact of the motor vehicle frame ( 13 ) to reduce or avoid. Impact absorption system ( 1 ) according to claim 1, characterized in that the means are designed as a slot-connection means combination to a substantially force-free movement of the cross member ( 11 ) relative to the crash box ( 12 ) to realize. Impact absorption system ( 1 ) according to one of the preceding claims 1 to 2, characterized in that the means are designed as a shear-lug combination means to a forceful displacement of the cross member ( 11 ) relative to the crash box ( 12 ) with energy absorption. Impact absorption system ( 10 ) according to claim 2 or 3, characterized in that the connecting means ( 30 ) as a screw, pin, and / or riveting agent ( 31 ) are adapted to connect the crash box ( 12 ) and the cross member ( 11 ) to realize. Impact absorption system ( 10 ) according to one of claims 1 to 4, characterized in that the means are adapted to receive an oblique impact, which preferably in an angular range of> = 0 ° to <= 20 °, more preferably from> = 5 ° to <= 15 ° and most preferably from> = 8 ° to <= 12 ° with respect to the motor vehicle longitudinal axis (A), and is preferably around 10 °. Impact absorption system ( 10 ) according to one of claims 1 to 5, characterized in that the slot ( 40 ) and / or the shearing track ( 50 ) is formed substantially transversely to the motor vehicle longitudinal axis (A) in order to prevent a movement of the connecting means ( 30 ) and thus the cross member ( 11 ) to allow transverse to the vehicle longitudinal axis (A). Impact absorption system ( 10 ) according to one of claims 1 to 6, characterized in that the shearing track ( 50 ) substantially in the direction of the vehicle longitudinal axis (A) tapers to a force-related movement of the connecting means ( 30 ) and thus the cross member ( 11 ) to allow transverse to the vehicle longitudinal axis (A). Impact absorption system ( 10 ) according to one of claims 1 to 5, characterized in that the cross member ( 11 ) at two points symmetrically to the motor vehicle longitudinal axis (A), each with a crash box ( 12 ) via a respective connecting device ( 20 ) connected is.