DE102012112636A1 - Bumper assembly for motor vehicle, has extensions, which come in corresponding latch for engagement in event of crash, and are spread apart by actuator in event of pedestrian collision - Google Patents

Abstract

The bumper assembly (1) has a pedestrian protection (6), which is particularly partially covered from a metallic material, where a jacket (10) has two extensions (11) towards a crash box (3). A cross element (2) and the crash box partially overlap. The extensions come in a corresponding latch (12) for engagement in the event of crash, and are spread apart by an actuator in the event of a pedestrian collision, so that the pedestrian protection dampens the pedestrian collision. The extensions are moved over longitudinal direction to the latch in motor vehicle.

Description

The present invention relates to a bumper assembly on a motor vehicle according to the features in the preamble of claim 1.

The present invention further relates to a bumper assembly on a motor vehicle according to the features in the preamble of claim 2.

The present invention also relates to a bumper assembly on a motor vehicle according to the features in the preamble of claim 3.

From the prior art, it is known to use motor vehicle front and rear bumper assemblies, so that in a case of an impact of the motor vehicle on an object or on another motor vehicle damage is minimized.

For example, a cross member in a bumper assembly serves, for example, to direct and distribute the impact energy of an article impacting, for example, centrally on the motor vehicle in such a way that it is deliberately introduced into crash boxes and in turn into longitudinal members of the motor vehicle. Furthermore, crash boxes are provided which convert, for example, by folding in certain crash situations impact energy in forming work by wrinkling.

Previously mentioned bumper systems are used in particular to minimize the accident damage and accident risks in the event of a collision of the motor vehicle at high speed on stationary objects or other motor vehicles.

The accident scenario is different, however, when a pedestrian impact is imminent. Here it is important to protect the pedestrian as possible against the vehicle impact. For this purpose, there are pedestrian protection systems that attenuate in particular the impact of the lower extremities of the pedestrian in such a way that the risk of injury to the pedestrian is reduced. There are known from the prior art various approaches, such as ductile sheet metal structures or foam materials, which are connected upstream of a cross member and deploy their damping effect in the event of an impact with a pedestrian. A disadvantage of such systems, however, is that they require significant space, especially in motor vehicle X-direction, on the other hand for targeted energy reduction in the event of a crash with high intensity could be used.

For example, is from the EP 2 022 682 A1 a system is known which by corresponding locking means and a two-part design of the crash box makes it possible to detect an impending impact with high intensity or a pedestrian impact and in case of a pedestrian impact unlock the locking means, so that a relative movement of the two-part crash box to cushion the pedestrian impact is performed. However, the locking means are designed in the form of a complex scissors mechanism, on the one hand in the production of such a bumper system costly effect, on the other hand, especially in multi-year, even decades of use of the motor vehicle are sometimes prone to error.

Object of the present invention is therefore, starting from the prior art, to provide a bumper system that provides both a good crash absorption capability and a pedestrian protection, the bumper system is simple, has a low space requirement, especially in the vehicle longitudinal direction and is inexpensive to produce.

The aforementioned object is achieved in a bumper assembly with the features in claim 1.

The above object is achieved in an alternative embodiment in a bumper assembly having the features in claim 2.

The aforementioned object is achieved in a further alternative embodiment in a bumper assembly having the features in claim 3.

Advantageous embodiments of the present invention are the subject of the dependent claims.

The bumper arrangement according to the invention for a motor vehicle has a cross member, two crash boxes and a pedestrian protection, wherein the crash boxes are fixed to longitudinal members of the motor vehicle and the cross member is arranged in the region of the front ends of the crash boxes, being arranged in the direction of travel in front of the cross member pedestrian protection. According to the bumper arrangement is characterized in that the pedestrian protection is at least partially encased by a particular metallic material and the jacket has at least two extensions in the direction of the crash box, which overlap at least partially the cross member and / or the crash box, wherein the extensions in the event of a crash in a corresponding lock to engage and in case of a Pedestrian impact can be spread by an actuator, so that the pedestrian protection dampens the pedestrian impact and the projections are thereby moved past the lock in the vehicle longitudinal direction.

In a further embodiment of the present invention, the above-mentioned bumper arrangement is characterized in that the pedestrian protection is at least partially encased by a metallic material in particular and the jacket has at least two extensions in the direction of the crash box, which overlap the cross member and / or the crash box at least in sections , wherein the two extensions are arranged at rest or in the normal state in such a spread to each other that the pedestrian protection dampens the pedestrian impact and the projections are moved past a lock in the vehicle longitudinal direction and in the event of a crash, the extensions are moved towards each other by at least one actuator, so that the projections in the lock come to engage.

In a third embodiment of the present invention, a bumper assembly for a motor vehicle is proposed which has a cross member, two crash boxes and pedestrian protection, the crash boxes are fixed to longitudinal members of the motor vehicle and the cross member is disposed in the region of the front ends of the crash boxes, wherein Direction of travel is arranged in front of the cross member of the pedestrian protection. In the third embodiment, the pedestrian protection is also according to the invention of a particular metallic material at least partially sheathed, wherein the jacket in the direction of the crash box has at least two extensions, wherein the extensions are coupled to at least one actuator. The extensions are each assigned a lock in which the projections are positively engageable for engagement. The actuators spread now in operation of the motor vehicle, the extensions such that they are spread apart at a speed range of preferably 20 km / h to 40 km / h such that in an impact in this speed range, especially in a pedestrian impact, the pedestrian protection the pedestrian impact dampens and the extensions are moved past a lock in the vehicle longitudinal direction. If the motor vehicle falls below or exceeds the above-mentioned speed interval, that is, the vehicle is moving in a range between 0 km / h and 20 km / h or more than 40 km / h, the extensions are moved towards each other, so that in the event of a crash engage in the lock and cause a rigid extension of the crash box, which is reduced by forming wrinkles of the shell and / or the extensions and the crash box especially in the range above 40 km / h crash energy by forming work.

The bumper arrangement according to the invention thus makes it possible that the path available for the actual pedestrian protection in the vehicle longitudinal direction with the aid of the jacket is used as an additional energy absorption path analogously to the principle of a crash box. Thus both the path available in the longitudinal direction of the crash box for energy absorption of a high-intensity impact are available and, in the case of a locked crash box, the part of the jacket of the pedestrian protection, in order to convert crash energy into forming work. It can thereby convert both the coat of pedestrian protection and the section of the crash box available in the longitudinal direction for energy absorption by crimping crash energy into forming work.

In the context of the invention, this means for all three variants that the projections come into engagement in a lock and that they are positioned relative to the vehicle longitudinal direction before locking. By a vehicle crash or a high-intensity impact then learns the jacket and the extension coupled thereto a relative movement in decisively automotive longitudinal direction, so that the extension and / or a mantle extension are retracted into a receptacle or lock and lock there. Then the mantle initially extends the crash box in a stubby manner and is deformed by further force, so as to break down crash energy in forming work. Preferably, the jacket also throws specific folds, at least in the area of pedestrian protection.

In the case of a pedestrian impact this is passed through existing in the car or to be equipped so sensor and on-board electronics to the actuator, the actuator, the extensions, which can also be designed as tabs or tongues, the extensions overlap the crash box at least partially, so opposite the Crashbox spreads that they do not rest against this and / or in the lock to engage. This makes it possible that the projections are moved past the lock and thus the pedestrian protection unfolds its damping effect in the event of a pedestrian impact. Overall, it is thus possible within the scope of the invention that a simple and thus error-prone system is provided in its mechanical structure, which at the same time realizes optimized space utilization in the vehicle longitudinal direction.

If the bumper assembly according to the invention is not arranged on the vehicle front as already described above, but on Vehicle rear, so is a corresponding inverse structure in the context of the invention to understand. The crash boxes are thus coupled to longitudinal members of the vehicle rear, opposite to the main forward direction then behind the crash boxes of the cross member and in turn behind the cross member of the pedestrian protection is arranged.

In the context of the invention, the bumper arrangement is furthermore preferably characterized in that the pedestrian protection itself is formed from a material which is more ductile with respect to the cross member, the pedestrian protection itself being formed in particular from a plastic and / or from a foam material. Most preferably, the pedestrian protection in the form of a pedestrian protection strip is formed of a soft, in particular foam-like plastic material. Thus, the pedestrian protection extends substantially transversely to the direction of travel, preferably over the length of the cross member. Depending on the impact location of the pedestrian, based on the motor vehicle Y direction, this ensures that, in particular, the lower extremities of the pedestrian are protected by the pedestrian protection against a hard impact on the cross member. In the context of the invention, it is also possible that the pedestrian protection is not formed of a ductile or made of a foam material, but is formed of a hollow sheet metal structure. The sheet metal structure then folds or buckles in an impact with a pedestrian.

In the context of the invention, the arrangement of pedestrian protection and cross member is behind a bumper, which is usually preceded by a few millimeters thick Kunststoffzierhaut for optical and design technical completion of the vehicle body.

Further preferably, the cross member itself and / or the crash boxes and / or the jacket, which sheathed the pedestrian protection, formed of a metallic material. It is possible to produce the components from a steel material. Alternatively, a light metal material, in particular based on an aluminum alloy, is used, so that the aforementioned components are formed from an aluminum material. Here it is particularly possible to form the components as extrusion profile. This allows at the same time high shaping degrees of freedom at low production costs and low weight of the components themselves. Alternatively, it is possible to form one of the aforementioned components or all components also from a fiber composite material. For example, here is a glass fiber reinforced plastic or even a carbon fiber reinforced plastic used.

Furthermore, the jacket preferably surrounds pedestrian protection, in particular on the top and bottom sides. However, the sheath preferably also includes the front of the pedestrian protection, wherein the rear side, relative to the main direction of travel of the motor vehicle, does not have a sheathed surface. So here is the pedestrian protection, especially the foam material of the pedestrian protection, directly to the cross member.

Further preferably, the extensions are themselves one-piece and material uniform, in particular on the top and bottom of the shell, formed and comprise the crash box in the vehicle longitudinal direction, at least partially as a fork-like extension. Most preferably, the extensions are formed directly as an extension of the upper or lower lateral surface. Alternatively, it is within the scope of the invention also conceivable that the extensions themselves are coupled to the jacket of the pedestrian protection. This coupling can be made for example by a cohesive connection. Further preferably, it is possible within the scope of the invention that predetermined bending points are provided at the transition between jacket to extension, so that, in the case of spreading the extensions, it is possible to bend the extensions relative to the crash box in a particularly simple manner and also fail-safe. In the event of a crash, an initial location for folding the shell is still possible.

The locking itself is particularly preferred in the context of the invention as a cross-sectionally L-shaped web, wherein the web is arranged on the cross member or on the crash box. The web itself can in turn be formed integrally and material uniformly on the cross member or the crash box in the context of the invention. Alternatively, it is also possible that the web is positively and / or cohesively coupled to the cross member or the crash box. Between the L-shaped web and the outer circumferential surface of the crash box, a groove is then further formed, wherein one end of the extension in the groove by relative displacement for engagement can be brought. For this purpose, a distance is formed in particular in the idle state of the bumper assembly according to the invention between the groove itself and the end of the extension. In the case of activation of the actuator, it is thus possible that the extension is passed over the lock itself by first performing the spreading movement. However, if the actuator is not actuated and an impact, in particular a vehicle crash with high intensity, then the end of the extension is moved into the groove and brought into engagement therewith. In this case, a rigid connection between Crashbox and mantle is made, so that the coat by drape and the crash box also absorb by drape crash energy.

In the context of the invention, however, it is also possible that the web is formed not only as an L-shaped groove, but for example as a recess on the front of the cross member and / or the crash box. An extension or mantle extension of the shell itself then engages in the event of a crash in the recess and locked in this.

By activating the actuator, in particular the two projections are spread out in a mutually opposite motor vehicle Z-direction. Thus, the extension is moved at the top in positive motor vehicle Z-direction and the extension on the bottom in negative motor vehicle Z-direction, so that subsequently the extensions are spread across the crash box away. Due to the impact energy of the pedestrian, the extensions are then further spread and / or bent over the crash box.

In the context of the invention, it is conceivable to use different embodiments of actuators to perform the spreading movement of the extensions, which are explained below.

The actuator is preferably formed in the context of the invention as a linear actuator and disposed within the crash box. For example, the linear actuator can be designed as an electromagnetic actuator or else as an electromechanical actuator, for example as a spindle drive. The linear actuator then carries out a linear movement significantly in the motor vehicle Z-direction and presses the extension outward from an interior of the crash box, so that the extension slides over the lock when a movement in the vehicle longitudinal direction is carried out. Preferably, two linear actuators are arranged in a crash box, wherein the two linear actuators are then arranged in the opposite direction of movement. Each actuator is then assigned to an extension.

In the context of the invention, however, it is also possible to arrange a pyrotechnic actuator within the crash box. When igniting the pyrotechnic actuator is then carried out either due to the resulting gas pressure spreading of the extensions or mechanical actuators are moved by the gas pressure such that they spread the extensions.

In the context of the invention, it is also conceivable that the actuator is designed as a rotary cylinder, wherein the rotary cylinder opposite its central longitudinal axis has angled end faces. By turning the rotary cylinder tips of the angled end surfaces are brought into relative position to the extensions in such a way that they spread this. The axis of rotation of the rotary cylinder is significantly oriented in the motor vehicle Z direction arranged. The rotational movement of the rotary cylinder is in turn carried out via a further actuator, which is driven for example electromagnetically or else purely electrically or else electromechanically.

In the context of the invention, it is also conceivable that the actuator does not spread the projections from the inside to the outside via a kinematic deflection, but in turn pulls outward from the outside. Here, the actuation is based on the principle of a drawbridge. For example, traction cables may be coupled to the ends of the extensions, wherein the traction cables are deflected. Upon actuation of the traction cables by a further actuator itself a tensile force is passed on this pulls due to the deflection of the extensions each with respect to the crash box to the outside and spreads it, so that the extensions slide over the lock when carrying out a relative movement of the pedestrian protection in the vehicle longitudinal direction.

Further preferably, a portion is formed parallel to the crash box even in the vehicle longitudinal direction. This section is particularly preferably reinforced and / or has increased strength properties and / or an increased wall thickness on the crash box itself, so that in the event of a crash, a cooler installation space does not experience or in a negligible manner a change in length in the vehicle longitudinal direction. As a result, in a crash with medium intensity, for example, in a vehicle crash up to 60 km / h, the radiator of the motor vehicle is protected, so that the repair costs are kept to a small extent. The section can be generated, for example, by a "driving on block" of the crash box and / or the jacket by wrinkling, so that a further change in length in the vehicle longitudinal direction is no longer possible.

Further advantages, features, characteristics and aspects of the present invention are the subject of the following description. Preferred embodiments are shown in the schematic figures. These are for easy understanding of the invention. Show it:

1 a bumper assembly of the prior art in longitudinal section view;

2 a bumper assembly according to the invention in the idle state in longitudinal section view;

3a the bumper assembly according to the invention in a crash case; and b

4a the bumper assembly according to the invention in a pedestrian and b impact;

5 the bumper assembly according to the invention with pyrotechnic actuator;

6 the bumper assembly according to the invention with a drawing actuator;

7 the bumper assembly according to the invention with traction cable;

8th the bumper assembly according to the invention with rotatable locking;

9 a bumper assembly according to the invention with spread apart extensions;

10 a bumper assembly according to the invention with permanently moved towards each other or spread extensions;

11 a bumper assembly with extensions in the locked state;

12 the bumper assembly in the unlocked state and

13a a bumper assembly according to the invention in a view of and b above.

In the figures, the same reference numerals are used for the same or similar components, even if a repeated description is omitted for reasons of simplicity.

1 shows a bumper assembly 1 as known in the art. The bumper arrangement 1 has a cross member 2 on, with the cross member 2 about crash boxes 3 with a side member 4 a motor vehicle is coupled. In the direction of travel 5 in front of the crossbeam 2 is additionally a pedestrian protection 6 arranged, with the pedestrian protection 6 itself upstream a front bumper 7 is. In case of a pedestrian impact, the deformation path is 8th pedestrian protection 6 to cushion the pedestrian impact available. In the case of a high intensity impact, this dampens the deformation path 8th pedestrian protection 6 in a negligible way. This is then a deformation path 9 the crashbox 3 to disposal.

2 In contrast, shows a bumper assembly according to the invention 1 , in which also a cross member 2 is provided, via crash boxes 3 with a side member 4 a motor vehicle is coupled. The cross member 2 is also upstream in the direction of pedestrian protection 6 , being the pedestrian protection 6 even a front apron 7 upstream. The pedestrian protection 6 has a jacket according to the invention 10 on, the latter on the top, bottom and front, the latter in relation to the direction of travel 5 , surrounds. The coat 10 itself again has extensions 11 on, the cross member 2 against the driving direction 5 at least partially overlap. The extensions 11 themselves are at a distance a in the direction of travel 5 to a lock 12 spaced. The lock 12 is designed as a receptacle and here as part of the cross member 2 with trained.

Between the lock 12 and a front side 13 of the crossbeam 2 is a groove 14 formed, wherein in the groove 14 in the event of a crash, an end 15 a respective extension 11 positively engages the engagement. This is shown in 3a , The end 15 of the extensions 11 is in the groove 14 at the lock 12 came to the intervention. Upon further impressions of the bumper assembly according to the invention 1 against the driving direction 5 thus follows the crash box 3 even at least in sections, a drapery 16 , In this case, crash energy or impact energy is converted into forming work. According to the invention according to 3b also a drapery 17 on the coat 10 pedestrian protection 6 instead of. The pedestrian protection area 6 itself is compressed as well.

The one in the crashbox 3 arranged actuators 18 are in the crash scenario according to 3a and b has not been activated. At the crash box 3 itself remains a radiator compartment 19 acting as a spacer between the drapery 16 the crashbox 3 as well as the side member 4 thrust remains, so that in the cooler space 19 related to the vehicle longitudinal direction and between the crash boxes 3 mounted objects are not damaged by the impact itself. Through the drapery 16 is the crashbox 3 "Driven to block". The fact that now also the coat 10 pedestrian protection 6 is usable for energy absorption, it is possible with the bumper assembly according to the invention 1 according to 2 and 3 a projecting total length L, which is opposite to the side member 4 to reach, which is shorter than the known from the prior art length L1 of the bumper assembly 1 according to 1 ,

Also the crossbeam 2 itself can deform in the context of the invention at the same time or at higher load, which is not shown here in detail.

4a shows the bumper assembly according to the invention 1 in an activation during an imminent impact with a pedestrian. The actors 18 go to positive or negative motor vehicle Z-direction relative to the cross member 2 out, leaving the extensions 11 be spread. The upper extension related to the image plane 11 and the lower appendage 11 are spread in opposite directions and in relative motion R of the pedestrian protection 6 according to 4b towards the side member 4 Thus, a splitting or peeling of the extensions takes place 11 and a crushing of pedestrian protection 6 so that it can develop its absorbing effect. The crashbox 3 itself as well as the cross member 2 remain largely untouched by the pedestrian impact. The coat 10 pedestrian protection 6 has a kink 20 at the front end, for easier spreading of the extensions 11 serves.

5 shows a further embodiment of the invention the bumper assembly 1 , where here the actuator as a pyrotechnic propellant charge 21 inside the cross member 2 is arranged. About another ignition factor 22 Thus, it is possible to ignite the pyrotechnic propellant charge upon detection of an impending pedestrian impact, so that they are the extensions 11 spreads in the Z-direction, so that the extensions 11 when running an in 5 not shown relative movement of the pedestrian protection 6 over the lock 12 glide away.

6 shows a further embodiment of the bumper assembly according to the invention 1 , in which case for the actuation of the extensions 11 Zugaktoren 23 on the outside of the cross member 2 are arranged, which the extensions 11 opposite to the embodiment according to 4 do not push away in the Z-direction, but pull away.

7 shows a further alternative embodiment of the actuator, in which case a pull rope 24 on the outside of the extensions 11 is arranged, that over turning points 25 so kinematically with an actuator 18 is coupled, that upon actuation of the actuator 18 the extensions 11 in the Z direction, in each case based on the cross member 2 to be pulled outside.

8th shows an alternative embodiment in which not the extensions 11 spread, but the lock 12 as a separate component in the event of an imminent pedestrian impact in the direction of rotation D is wegschwenkbar. The extensions 11 have due to the weggeschwenkten lock no abutment more, which is why they are not closer in. By executing the 8th shown relative movement of the pedestrian protection 6 would also spread, so the pedestrian protection 6 can dampen the impending impact with the pedestrian.

9 shows an alternative embodiment of the bumper assembly according to the invention 1 , Here is the bumper assembly 1 constructed analogously to the in 2 shown bumper assembly 1 comprising a cross member 2 , wherein in the cross member 2 actuators 18 are arranged, and a cross member 2 upstream pedestrian protection 6 , The actors 18 can in the context of the invention in vehicle transverse direction also partially outside, in particular at the ends of the cross member 2 be arranged to a low-interference folding of the cross member 2 to allow in the event of a crash. The crossbeam 2 turn is with a crashbox 3 coupled, which on a side rail 4 is fixed. The pedestrian protection 6 is also at the image-level left side at the top and bottom of a mantle 10 coated, with the coat 10 according to the invention extensions 11 has, here the cross member 2 Cover at least partially in the vehicle longitudinal direction. The extensions 11 are in the in 9 illustrated embodiment such with the coat 10 coupled, that a mantle process 26 as well as the extensions 11 even shown in a spread position. If now an imminent vehicle crash is detected, it is possible for the actuators 18 to contract and thereby the extensions 11 towards each other, causing the mantle processes 26 in a recording 27 on the cross member 2 positively engage. This forms the coat 10 also the possibility of a drape 16 and thus an extension of the available for the energy reduction path of the crash box 3 , However, if the system is located as in 9 shown in initial position, comes the pedestrian protection 6 on the front side 13 of the crossbeam 2 to the plant and would then compressed by the impact with the pedestrian and thereby dampens the pedestrian impact.

10 shows a variant added thereto, wherein the coupling webs 28 from actor 18 and extension 11 a breaking point 29 have, in particular in the form of a notch, so that in a pedestrian impact the coupling webs 28 at the breaking point 29 kink or break and parts of the coupling webs 28 and extensions 11 thus in the vehicle longitudinal direction over the cross member 2 can glide away. The kink 20 in the front area of the coat 10 pedestrian protection 6 Here serves the easier contraction of the extensions 11 ,

11 shows that in 9 shown system in an intervention that leads to a vehicle crash in a lock. The actors 18 have the extensions 11 moved toward each other so that the mantle processes 26 when moving in the vehicle longitudinal direction in the recording 27 come to the intervention. The coat 10 itself would be just like the crashbox in this case 3 by folding wrinkles.

12 shows a third possible embodiment of the present invention, which has an analog structure to in particular the in 9 respectively. 10 has illustrated embodiment variant. However, this does not happen when sensing a impending impact, but speed-dependent set a respective operating state. This is how the extensions become 11 about the actors 18 depending on the speed of the vehicle always moved to a corresponding operating state. For example, the extensions are 11 of the coat 10 at a speed of less than 20 km / h and over 40 km / h towards each other, so that the mantle processes 26 in a recording 27 come through an impact to the intervention. In a speed range of 20 km / h to 40 km / h, the extensions are 11 as shown here then spread, so that the pedestrian protection 6 would have a damping effect in the vehicle longitudinal direction and the extensions 11 on the cross member 2 glide by. For the required permanently elastic spreading and contraction of the extensions 11 to the mantle process 26 is the kink in the front area of the jacket 20 designed as a material weakening. It is also conceivable to locally reduce areas by a post-treatment in the heat strength. 13a and 13b each show a plan view of the bumper assembly according to the invention 1 , Here are the side members 4 with upstream crash box 3 and arranged in front of cross member 2 shown. In 13a is the crossbeam 2 shown in vehicle Y-direction formed as a continuous straight profile. Would now the crash boxes 3 with the pedestrian protection, not shown 6 drive on block, so would remain the radiator compartment also shown 19 untouched. The crossbeam 2 Thus, even with heavily deformed crash boxes not into the radiator compartment 19 penetrate, so that arranged therein components such as a motor vehicle radiator are not damaged. The coat 10 itself extends substantially over the entire length in motor vehicle Y-direction of the cross member 2 ,

Deviating from this shows 13 on the one hand, a cross member 2 which has a slight curvature in motor vehicle Y direction. In particular, this is important for the RCAR test with central central impact. In addition, however, the embodiment according to 13a local coats referred to the motor vehicle Y-direction 10a , b on, being a coat 10a each in front of a crash box 3 is arranged and the coat 10b essentially in the middle. An optional additional pedestrian protection 6 can be local in the area of each mantle 10a , b be arranged or, as shown here, over the substantially entire width of the cross member 2 extend, and then only locally from the coats 10a / 10b be covered with respect to the motor vehicle Y direction.

LIST OF REFERENCE NUMBERS

1

bumper assembly

2

crossbeam

3

crash box

4

longitudinal beams

5

direction of travel

6

pedestrian protection

7

front apron

8th

Deformation path too 6

9

Deformation path too 3

10

Coat too 6

11

Extension to 10

12

 lock

13

Front to 2

14

 groove

15

End to 11

16

Drape too 3

17

Drape too 10

18

 actuator

19

 cooler space

20

 kink

21

 pyrotechnic propellant charge

22

 Zündaktor

23

 Ziehaktor

24

 rope

25

 turning point

26

 Circumferential continuation

27

 admission

28

 coupling rod

29

 Predetermined breaking point

L

overall length

L1

 Overall length bumper arrangement prior art

R

relative movement

D

direction of rotation

Y

Motor vehicle X direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2022682 A1 [0008]

Claims (16)

Bumper assembly ( 1 ) for a motor vehicle, comprising a cross member ( 2 ), two crash boxes ( 3 ) and pedestrian protection ( 6 ), whereby the crash boxes ( 3 ) on longitudinal members ( 4 ) of the motor vehicle are fixed and the cross member ( 2 ) in the area of the front ends of the crash boxes ( 3 ) is arranged, wherein in the direction of travel in front of the cross member ( 2 ) pedestrian protection ( 6 ), characterized in that the pedestrian protection ( 6 ) is at least partially encased by a particular metallic material and the jacket ( 10 ) towards the crash box ( 3 ) at least two extensions ( 11 ) having the cross member ( 2 ) and / or the crash box ( 3 ) overlap at least in sections, wherein the extensions ( 11 ) in the event of a crash in a corresponding locking engage and in case of a pedestrian impact by an actuator ( 18 ) are spreadable so that the pedestrian protection ( 6 ) dampens the pedestrian impact and the extensions ( 11 ) on the lock ( 12 ) are moved past in the vehicle longitudinal direction. Bumper assembly ( 1 ) for a motor vehicle, comprising a cross member ( 2 ), two crash boxes ( 3 ) and pedestrian protection ( 6 ), whereby the crash boxes ( 3 ) on longitudinal members ( 4 ) of the motor vehicle are fixed and the cross member ( 2 ) in the area of the front ends of the crash boxes ( 3 ) is arranged, wherein in the direction of travel in front of the cross member ( 2 ) pedestrian protection ( 6 ), characterized in that the pedestrian protection ( 6 ) is at least partially encased by a particular metallic material and the jacket ( 10 ) towards the crash box ( 3 ) at least two extensions ( 11 ) having the cross member ( 2 ) and / or the crash box ( 3 ) overlap at least in sections, wherein the extensions ( 11 ) in the event of a crash in a corresponding lock ( 12 ) and in case of a pedestrian impact by an actuator ( 18 ) are spreadable, wherein the extensions ( 11 ) are spread apart in such a way that the pedestrian protection ( 6 ) dampens the pedestrian impact and the extensions ( 11 ) on a lock ( 12 ) are moved past in the vehicle longitudinal direction. Bumper assembly ( 1 ) for a motor vehicle, comprising a cross member ( 2 ), two crash boxes ( 3 ) and pedestrian protection ( 6 ), whereby the crash boxes ( 3 ) on longitudinal members ( 4 ) of the motor vehicle are fixed and the cross member ( 2 ) in the area of the front ends of the crash boxes ( 3 ) is arranged, wherein in the direction of travel in front of the cross member ( 2 ) pedestrian protection ( 6 ), characterized in that the pedestrian protection ( 6 ) is at least partially encased by a particular metallic material and the jacket ( 10 ) towards the crash box ( 3 ) at least two extensions ( 11 ) having the cross member ( 2 ) and / or the crash box ( 3 ) overlap at least in sections, wherein the extensions ( 11 ) depending on the speed by at least one actuator ( 18 ) are spread or moved towards each other, so that they are locked in place ( 12 ) are engaged or spread in such a way that the pedestrian protection ( 6 ) dampens a possible pedestrian impact and the extensions ( 11 ) on the lock ( 12 ) are moved past in the vehicle longitudinal direction. Bumper arrangement according to claim 1 to 3, characterized in that the pedestrian protection ( 6 ) from one opposite the cross member ( 2 ) is formed ductile material, in particular of a plastic and / or of a foam material. Bumper arrangement according to one of claims 1 to 4, characterized in that the cross member ( 2 ) and / or the crash boxes ( 3 ) and / or the jacket ( 10 ) are formed of a metallic material, in particular of a light metal, very particularly preferably of an extrusion profile or of a fiber composite material. A bumper assembly of any one of the preceding claims, characterized in that the extensions ( 11 ) in one piece and uniform material on the jacket ( 10 ) are formed. Bumper arrangement according to one of the preceding claims, characterized in that the lock ( 12 ) is formed as a cross-sectionally L-shaped web, wherein between the L-shape and the outer circumferential surface of the crash box ( 3 ) a groove ( 14 ) is formed, wherein one end of the extension ( 11 ) in the groove ( 14 ) Can be brought by relative displacement for engagement. Bumper arrangement according to the preceding claim, characterized in that in the state of rest between the groove ( 14 ) and the end of the extension ( 11 ) A distance is formed. Bumper arrangement according to one of the preceding claims, characterized in that the actuator ( 18 ) the ends of the extensions ( 11 ) spreads in opposite motor vehicle Z directions. Bumper arrangement according to one of the preceding claims, characterized in that the actuator ( 18 ) is designed as a linear actuator and within the crash box ( 3 ) is arranged. Bumper arrangement according to one of the preceding claims, characterized in that the actuator ( 18 ) as a pyrotechnic actuator ( 18 ), wherein the actuator ( 18 ) within the crash box ( 3 ) is arranged. Bumper arrangement according to one of the preceding claims, characterized in that the actuator ( 18 ) is designed as a rotary cylinder, wherein the rotary cylinder relative to its central longitudinal axis angled end faces, wherein by turning the rotary cylinder tips of the angled end surfaces of the extensions ( 11 ) spread. Bumper arrangement according to one of the preceding claims, characterized in that in the event of a crash, the crash box at the crash box ( 3 ) locked coat ( 10 ) and / or the jacket ( 10 ) of pedestrian protection ( 6 ) Folds and crashes the crash box ( 3 ) in the longitudinal direction at least partially folds raises. Bumper arrangement according to one of the preceding claims, characterized in that at the crash box ( 3 ) in the longitudinal direction of a cooler space ( 19 ) is formed, which has a higher strength and / or wall thickness relative to the section of the crash box ( 3 ) that wrinkles. Bumper arrangement according to claim 3, characterized in that the extensions ( 11 ) are moved towards each other at a speed of the motor vehicle of 0 km / h to 20 km / h and over 40 km / h, so that they engage in a lock and at a speed of 20 km / h to 40 km / h through the actor ( 18 ) are spread so that they are at the locking ( 11 ) are passed. Bumper arrangement according to one of the preceding claims, characterized in that the jacket ( 10 ) and / or the extensions ( 11 ) at least partially have a reduction in wall thickness and / or a bending point, so that they can be spread and moved towards one another, in particular taking into account the fatigue behavior.

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