DE102004014776A1 - Longitudinal support for vehicle, especially motor vehicle, has energy absorbing device(s) that interacts with piston-cylinder arrangement activated in collision, especially frontal collision with energy absorption by energy absorber - Google Patents

Abstract

The longitudinal support (1) is fitted between a transverse bumper support (2) and a passenger cell (3). The longitudinal support has at least one tube section (7) mounted on the passenger cell in a fixed position and containing a movable piston (9) connected to a piston rod (10) joined to the transverse support and at least one energy absorbing device (7;9;10;11;12;14) that interacts with the piston-cylinder arrangement, which is activated in the event of a collision, especially a frontal collision with energy absorption by the piston-cylinder arrangement.

Description

The The invention relates to a side member for a vehicle, especially for a motor vehicle, according to the preamble of claim 1.

One is generally known, generic longitudinal beams between a bumper crossmember and arranged a passenger compartment. In concrete terms, two side members are on one Vehicle provided, which are spaced apart in the vehicle transverse direction and are arranged approximately parallel. The two side members are it is part of a front end structure, so that by the side members a stable construction created between the bumper cross member and the passenger compartment is.

task the invention is a side member for a vehicle, especially for a motor vehicle to create, in addition to the stability of the longitudinal member a optimal deformation behavior of the longitudinal member in the event of a collision given is.

These The object is achieved with the features of claim 1.

According to claim 1, the side member at least a directly or indirectly arranged fixed to the passenger compartment Pipe section in which to form a cylinder-piston assembly a piston is slidably received. One connected to the piston Piston rod is directly or indirectly connected to the bumper cross member. In addition, at least one energy absorption device is provided, which is in operative connection with the cylinder-piston assembly. In a collision of the vehicle, especially in a frontal collision, is the cylinder-piston assembly under energy absorption means the energy absorption device operable.

Advantageous in this side member, that due to the operative connection between the cylinder-piston assembly and the energy absorption device in the event of a collision of the vehicle a defined deformation behavior of the longitudinal member with energy absorption the energy absorption device is created. This can be done with the side member on easy way to meet different crash requirements. A plurality of crash requirements are placed on the one or more longitudinal members in one Front of the vehicle provided, wherein the longitudinal member according to the invention in a Rear vehicle of the vehicle can also be used. So is z. B. pedestrian protection an important crash request. In addition to the pedestrian protection is the occupant protection for the vehicle occupants not to neglect. The goal must be that in case of collision of the vehicle one possible low occupant exposure can be achieved. These are for example the US NCAP or the EURO NCAP, where the vehicle with 56 km / h or driven at 64 km / h against a wall to lead, with the result of which is an evaluation of the vehicle with respect to Occupant safety can be made. In addition, a regular pre-crash function, in which z. B. the bumper just before a collision is extended for an enlargement of the Deformationsweges, provided. Generally, for the energy absorption device, with the cylinder-piston arrangement, which is part of the longitudinal member, is in an active compound, a high specific energy absorption advantageous, d. h., That related to the deformation length of the Energy absorption device absorbs the largest possible amount of energy can be. Depending on the design of the energy absorption device an adaptive deformation force can be provided, i. h. that the deformation force as a function of severity or as a function of the colliding obstacle. In addition, can an increase in the deformation force at a arranged in the front end Side member in the front Range possible be. The force / distance identifier of the energy absorption device can while rectangular or sloping. Overall, the design of the Energieabsorptionseinrichtung and thus the longitudinal member to ensure that one possible great Protection potential, especially with regard to pedestrian protection and occupant protection can be achieved.

In a concrete embodiment the at least one energy absorption device can be replaced by at least Beulrohr be formed, the at least partially between arranged the pipe section and the bumper cross member is. With the bulge tube a simple to produce component is proposed, with the functionally reliable obtained a corresponding energy absorption can be. The bulge tube can already be pre-bent, see above that a desired Buckling behavior can be easily obtained.

In In a further development, the bulge tube may at least be the piston rod partially envelop with a gap distance. For a compact design is it is advantageous if the bulge tube completely surrounds the piston rod. Thereby can the bulge tube over the piston rod in a collision conditional actuation of Cylinder-piston arrangement and the simultaneous buckling of the bulge tube are performed.

In a further embodiment, the Beulrohr be firmly connected to the pipe section and / or with the bumper cross member. If the buckle tube is integrated with the longitudinal member in such a way, a compact and stable unit is created as a whole, but in the event of a collision it has a correspondingly desired energy absorption or deformation behavior.

According to one another embodiment between the bulge tube and the bumper cross member at least one sealing element and / or at least one buffer element and / or at least one sensor device be arranged. For example, if a sensor device between the Beulrohr and the bumper cross member arranged, This will be in a collision of the vehicle and thus a force on the bumper cross member and so that a signal is output from the sensor device on the bulge tube, such that due to this signal, for example, an occupant protection safety device can be activated.

In a further embodiment the bulge tube and the pipe section made in one piece as a tube part be. It is at least partially in Beulrohrbereich the pipe part formed a buckling and / or wave profile. This allows the pipe part be easily prepared, with the bulge tube and the pipe section then consist of the same material. To a defined denting in Beulrohrbereich the pipe part is to ensure a corresponding Pre-buckling by means of the bulge and / or wave profile in the tubule area necessary. Since the bulge tube and the tube section have the same wall thickness, can also in the pipe section area of the pipe part a gain, for example via reinforcing rings be provided. Overall, make sure that on the one hand the Beulrohr or the tubule area in a desired accordingly Dented under energy absorption and on the other hand in the Cylinder-piston arrangement in case of collision, a shift of Piston within the pipe section or the pipe section area possible is.

In In another preferred embodiment, the at least one Energy absorption device by at least one in the pipe section formed receiving space, in which at least one Energy absorption medium is added. The recording room is included through the pipe section itself and through the piston of the cylinder-piston assembly limited.

In a concrete embodiment For example, the energy absorbing medium may be replaced by a gas and / or by a gas Foam material may be formed, each with energy absorption is compressible. Alternatively, the energy absorption medium may also through a liquid be formed. The receiving space can at least one discharge opening in having the nature of a throttle device through which the energy absorption medium, especially the liquid, controlled from the receiving space can be discharged. Is the energy absorption medium a gas, this is for an energy absorption by the displacement of the piston accordingly compressed. In a foam material as an energy absorption medium penetrates the piston by the collision-related actuation of the Cylinder-piston arrangement the foam material, so that accordingly Energy is absorbed. The foam material can also be in the form of a Foam cartridge be arranged in the receiving space, so that only at a sensed collision, a corresponding ignition of the foam cartridge below Release of the foam material is completed. In use a liquid As an energy absorption medium, it is subject to collision displacing piston through the discharge opening from the receiving space herausverlagert, with the discharge opening in the type of throttle device is executed. With a constant cross section the discharge opening occurs a descending force / distance identifier. Is the cross section of the discharge opening changeable, so can a correspondingly desired Force / distance identification through change the diameter of the discharge opening reached become.

To can the discharge opening in a further education their size depending at least one by means of at least one sensor device sensed collision parameters be adjustable. This setting can be used, for example, as a function of the severity of the accident or as a function be defined by the colliding obstacle.

According to one another embodiment the discharge opening, preferably by means of at least one discharge line, with at least one collecting area and / or at least one stiffening area. there becomes the energy absorbing medium displaced from the receiving space transferred to the collection area and / or in the stiffening area and there to stiffen the stiffening area or to close load paths collected and kept. Is the used energy absorption medium for example a liquid, This can be achieved by a corresponding actuation of the cylinder-piston assembly on the Discharge opening in the stiffening area are transferred, so that new load paths are activated.

In addition, in a further embodiment, at least one safety device can be activated by the energy absorption medium displaced from the receiving space. Thus, for example, by the displaced energy absorption medium, a restraint system can be activated, the example example, the Gurtvorspannung changed, the Kniepolster-, the steering, the pedal or seat adjustment changed and makes an adjustment of the footrest, so that a total of the greatest possible protection potential for the vehicle occupant is obtained.

According to one next Embodiment can absorbed the energy absorption medium in the receiving space under bias be. This is a kind of spring action in the cylinder-piston assembly received, so that, for example, the type of damage test, at that is driven against a wall at 4 or 8 km / h can.

For a simple execution the receiving space, the energy absorption medium in a development be included in a balloon-like tube element, which in Recording room is arranged. Thus, the receiving space and thereby The pipe section can be easily made, as for the inside the absorption space arranged energy absorption medium necessary Tightness of the receiving space taken over by the balloon-like hose element becomes. This can easily be filled with the energy absorption medium and subsequently be arranged in the receiving space in the manufacture of the vehicle. The energy absorbing medium disposed in the balloon-like tube member can here, for example, already under bias in the hose element be included. The hose element can also be designed so that from a certain pressure, i. H. from a certain force the piston on the hose element, this bursts and the example liquid Energy absorption medium through a discharge opening in the pipe section dissipated can be. Basically, the Pistons should also be made so that there is a gap between the piston and the pipe section is formed, so that after the bursting of the Hose element the liquid Energy absorption medium through the gap between the piston and pipe section depressed can be.

In In another embodiment, at least one piston valve can be provided in the piston be provided that openable upon actuation of the cylinder-piston assembly is. As a result, in a liquid energy absorption medium a repression the same done by the piston valve, so that thereby also a corresponding desired throttle effect can be obtained with assigned force / distance identifier. The throttle effect depends on it from the flow velocity and hence the severity of the accident or the obstacle.

In a further embodiment the at least one energy absorption device can be replaced by the Be formed piston. In this case, a preferably frictional freewheel on the piston be arranged. As a result, upon actuation of the cylinder-piston assembly the piston is moved accordingly, with the freewheel of the Piston a corresponding "piston eater" in the pipe section arises, which absorbs energy accordingly.

In a development, the freewheel at least one clamping ball have, during the displacement of the piston along an am Piston trained ramp is shifted for a frictional jamming the clamping ball and thus the piston relative to the pipe section. This is proposed a simple and reliable version of a freewheel, basically every one embodiment a freewheel could be used in which a desired deadlock with corresponding energy absorption can be obtained.

In one next Embodiment, the at least one energy absorption device by the piston may be formed, wherein the piston in the manner of a mandrel is trained. In addition, the pipe section can at least partially be designed so that in a collision conditional actuation of Cylinder-piston arrangement of the pipe section by means of the piston and the energy absorption is expandable. For example, in the pipe section formed notches by the displacement of the piston accordingly be widened or eliminated, with a corresponding Energy absorption takes place. By removing the notches in the pipe section, the longitudinal member in this In addition, the area can be stabilized, so that in addition to the energy absorption so transformed by eliminating the notches in the pipe section of the side members is that a power transmission over accordingly then designed load paths can be done.

In an alternative embodiment the at least one energy absorption device can be replaced by the Pistons are formed, wherein the piston is designed so that in a collision conditional actuation of the cylinder-piston assembly a corresponding trained everting area of the pipe section is umstülpbar by means of the piston under energy absorption. In this case, for example, within the pipe section a so-called. reversing pipe be arranged so with the piston of the cylinder-piston assembly cooperates in the event of a collision - related relocation of the Piston a corresponding eversion the Stülprohres is obtained under energy absorption.

According to a further embodiment, the at least one Energieabsorptionseinrich tion be formed by the piston rod such that at a collision conditional actuation of the cylinder-piston assembly first displacement of the piston rod in the undeformed state up to a preferably formed on the pipe section stop and that subsequently in a further collision-induced force on the piston rod this under energy absorption is deformable. In this case, the piston rod is designed so that first a corresponding displacement of the piston rod is possible and only with further force deformation with a corresponding energy absorption of the piston rod. If the piston rod is formed from a tube, this must be adjusted accordingly via the wall thickness of the piston rod.

According to one next Embodiment, the at least one energy absorption device by be formed the pipe section. In this case, the pipe section at a collision-related actuation the cylinder-piston arrangement at least partially in the axial direction of the pipe section to be deformable under energy absorption. The pipe section is to be interpreted that a first desired displacement of the piston within the pipe section upon actuation of the cylinder-piston assembly can be done and only afterwards a corresponding deformation is performed with energy absorption.

In a development, at least one stiffening ring on the pipe section for one Radial stiffening be provided. By the at least one Stiffening ring is largely ensured that in the event of a collision Force on the pipe section a deformation of the same takes place in the axial direction.

In a further embodiment may be in the axial direction of the pipe section a plurality of each other provided spaced through holes be. This creates a constant force / distance identifier in the pipe section, being the height the force after the accident severity or the collided obstacle and thus directed to the deformation rate.

According to one next Design can between the bumper cross member and the piston rod at least an energy absorption box may be arranged. With this energy absorption box can for example, a fulfillment the type damage checks easily achieved, d. h. that at the corresponding 4 or 8 km / h test only the energy absorption box takes damage, the easy and cost-effective can be exchanged, thus allowing a favorable classification in the insurance class the type damage check can be achieved. In addition, with the energy absorption box also the pedestrian protection positively influenced.

In another concrete embodiment can the cylinder-piston assembly for an enlargement of the Distance between the bumper cross member and the pipe section so operable be that the piston together with the piston rod at least partially from the pipe section is extendable for a displacement of the bumper cross member. Thereby the deformation path available in the event of a collision becomes advantageous enlarged, so that due to the longer deformation path more energy can be absorbed, thus having a positive influence the occupant protection can be achieved.

In a development, at least one sensor device, preferably at least one pre-crash sensor device, be provided by means of the extension of the cylinder-piston arrangement can be activated. For example, with the pre-crash sensor device an imminent collision senses the vehicle, the cylinder-piston assembly for an increase in the distance between the bumper cross member and the Pipe section actuated, while doing according to the piston together with the piston rod The pipe section is partially extended.

According to one next Embodiment, wegbegrenzt the extension of the cylinder-piston assembly be. Preferably, at least one stop element is provided, given by the corresponding travel limit for the cylinder-piston assembly is.

In a further embodiment, a displacement medium can be introduced into the pipe section for the extension of the cylinder-piston arrangement. Additionally or alternatively, a hydraulic and / or pneumatic and / or electric drive means may be provided, which is coupled to the cylinder-piston arrangement, that the piston is at least partially extendable out of the pipe section together with the piston rod. If, for example, an imminent collision of the vehicle is sensed by a pre-crash sensor device, then a gas can be ignited so that the piston is displaced accordingly for extension of the cylinder-piston arrangement. With a corresponding drive device, the extension of the cylinder-piston arrangement can be carried out alternatively or in addition to the displacement medium. If, in addition, the pre-crash time is sufficient, a 2-component plastic, for example, can be introduced into the pipe section by means of the displacement medium, which flocculates there and can additionally absorb energy as foam as an energy absorption medium. With the displacement medium, in addition or al ternatively also a liquid column or a foam cartridge can be accelerated into the pipe section, which can then be used as an energy absorption medium.

According to one next Embodiment can the extension depending on be carried out by at least one predetermined driving parameters. The driving parameter is preferably the driving speed, d. h., that the cylinder-piston arrangement only from a collision speed of, for example, 50 km / h is extended. The drive device can be a motor or comprise a spindle. If the spindle is aligned in the vehicle longitudinal direction and for a deformation too stiff, so can a corresponding spindle bearing be provided, which in a collision-induced force tear off, so that the desired Energy absorption behavior of the longitudinal member by the energy absorption device not restricted by the spindle. In addition, usually two in the vehicle transverse direction juxtaposed longitudinal members only a drive device may be provided, which then preferably between the two side members, for example in the vehicle center, is arranged. Is the drive device pneumatic or hydraulically driven, so these pneumatic or Hydraulic components for an additional Energy absorption can be used.

In In another embodiment, a connected to the bumper cross member Ausfahrteil at least with a portion in the piston rod be added relatively displaceable. The extension part can for one Relocation of the bumper cross member with be coupled to an energy store, preferably with a spring element. Again, for example, by means of a pre-crash sensor device an activation of the corresponding biased energy storage take place, so that thereby extended the Ausfahrteil together with the bumper cross member is, for example for a Improvement of pedestrian protection.

In a preferred embodiment the side member can at least one of the pipe section approximately in the vehicle longitudinal direction weiterführenden Have Unterzugabschnitt, the at least partially in the vehicle vertical direction Seen below the passenger compartment is arranged. This is one Load path formed in a collision of the vehicle for a force application from the side member in the Beam section is activated so that while the passenger compartment advantageous from the collision-induced force largely is excluded.

In one next Embodiment, at least one support member may be provided by means the one about vertical support of the pipe section opposite the passenger compartment takes place. As a result, the side member is stable against the Passenger compartment arranged so that in case of collision of the vehicle a corresponding actuation the cylinder-piston arrangement possible is, wherein the energy absorption device according to the Cylinder-piston assembly interacts with energy absorption.

In a preferred specific embodiment can each two spaced apart in the vehicle transverse direction and approximately parallel to one another longitudinal members on a front end and / or be arranged on a rear of the vehicle. This is a common one Way executed Arrangement of side members on the vehicle proposed, wherein the longitudinal member according to the invention preferably on the front end is used. Although a majority of legally required Safety tests are related to the front end, is an insert the longitudinal member according to the invention at any time also possible at the rear of the vehicle.

Based a drawing is an embodiment closer to the invention explained.

It demonstrate:

1 a schematic sectional view through a longitudinal member according to the invention in a side view,

2 FIG. 2 a schematic sectional view of a partial region of a longitudinal carrier in a further embodiment, FIG.

3 a schematic sectional view of a portion of a longitudinal member in a further embodiment, and

4 a schematic sectional view of a portion of a longitudinal member in a further embodiment.

In 1 is a schematic sectional view of a longitudinal beam according to the invention 1 shown in a side view. The side member 1 is between a bumper cross member 2 and a passenger compartment 3 arranged. At the bumper cross member 2 is as conclusion to the outside a bumper cover 4 arranged. From the side member 1 continuing in the vehicle longitudinal direction is a Unterzugabschnitt 5 formed, seen in the vehicle vertical direction below the passenger compartment 3 is arranged. In addition, a carrier part 6 provided by means of an approximately vertical support of the longitudinal member 1 opposite the passenger compartment 3 he follows. In the embodiment shown here is the side member 1 arranged on the front of the vehicle, with an arrangement of the longitudinal member 1 at the rear is conceivable.

The side member 1 has a pipe section 7 on the over the Unterzugabschnitt 5 and the carrier part 6 is fixedly connected to the passenger compartment. In the pipe section 7 is to form a cylinder-piston assembly 8th a piston 9 slidably received. With the piston 9 is a piston rod 10 connected to the bumper cross member 2 connected is. Between the bumper cross member 2 and the pipe section 7 is a bulge tube 11 arranged as an energy absorption device, which is the piston rod 10 completely enveloped with a gap distance.

In the event of a frontal collision, the collision-induced force on the bumper cross member will now be used 2 the piston rod 10 together with the piston 9 in the pipe section 7 shifted, while the buckle tube 11 is dented under energy absorption.

As a further energy absorption device of the pipe section 7 as a recording room 12 be formed, in which an energy absorption medium, such as a liquid, is added. In the recording room 12 is a discharge opening 13 provided, which acts in the manner of a throttle device. That is, due to the displacement of the piston 9 that in the recording room 12 absorbed energy absorption medium through the discharge opening 13 from the recording room 12 can be dissipated out. The discharge opening 13 can be designed so that the size of the discharge opening 13 can be changed, so that thereby a corresponding force / distance identifier can be obtained. In the basic state of the longitudinal member 1 is the discharge opening 13 closed, leaving the energy absorption medium in the receiving space 12 is held. In addition, on the piston a freewheel 14 be provided so that at a displacement of the piston 9 in the pipe section 7 due to the freewheeling a kind of piston seizure can be obtained with energy absorption. This is a clamping ball 24 so along a ramp 25 shifts that frictional jamming between the clamping ball 24 and the pipe section 7 he follows. Overall, a plurality of clamping balls 24 according to the piston 9 be arranged so that so that the reliability is increased. Should the pipe section 7 also be deformable in the axial direction, so is for a radial reinforcement of the pipe section 7 corresponding to the outside of the pipe section 7 a plurality of stiffening rings 15 arranged.

The cylinder-piston arrangement 8th can also be operated so that at a sensed by a here not shown with pre-crash sensor device imminent collision of the vehicle, the piston 9 together with the piston rod 10 and thus with the bumper cross member 2 is extended, so that thereby the deformation path of the longitudinal member 1 is enlarged. This extension can by a stop element 16 be limited.

In 2 is schematically a partial area of the longitudinal member 1 shown in a further embodiment, wherein components having the same function as in 1 are provided with the same reference numerals. It can be seen that between the bumper cross member 2 and the piston rod 10 an energy absorption box 17 is arranged so that in a collision with low driving speed only an energy absorption in the energy absorption box 17 takes place, so that for a subsequent cost-effective repair only the energy absorption box 17 must be replaced. In addition, between the energy absorption box 17 and the tubule 11 a sensor device 18 provided so that at a corresponding force on the sensor device 18 For example, further safety devices of the vehicle, which are not shown here, can be activated. Additionally or alternatively to the sensor device 18 can be provided at this point, a sealing element and / or a buffer element.

In 3 is a schematic sectional view of a portion of the longitudinal member 1 shown in a further embodiment. Again, components with the same function as in 1 or 2 provided with the same reference numerals. Here it can be seen that the energy absorption box 17 not directly on the piston rod 10 as in the execution of 2 but on an extension part 19 is arranged. The extension part 19 is so inside the piston rod 10 arranged that with a corresponding displacement of the extension part 19 the energy absorption box 17 together with the bumper cross member 2 from the piston rod 10 can be moved away. For a corresponding displacement is a spring element 20 provided as energy storage.

In 4 is a part of the longitudinal member 1 schematically shown in a sectional view in a further embodiment, wherein functionally identical components are provided with the same reference numerals as in the previous figures. In this embodiment is in the recording room 12 of the pipe section 7 a balloon-like hose element 21 arranged in which the energy absorption medium is received. In a collision-induced actuation of the cylinder-piston assembly 8th becomes the piston 9 while in the direction hose element 21 shifted, so that the hose element bursts above a certain pressure, so that therein befindli che energy absorption medium, for example, by a discharge opening not shown here from the receiving space 12 can be dissipated. The hose element 21 is designed so that in collisions with low speed a corresponding Abpufferung by the hose element 21 takes place, with no destruction of the hose element 21 in accordance with low-speed collisions occurs. The pipe section 7 is in the embodiment shown here in one piece with the bulge tube 11 as a one-piece pipe part 22 executed, wherein for a desired buckling behavior of the bulge tube 11 a pruning 23 in the buckling pipe section of the pipe part 22 is trained.

1

longitudinal beams

2

Bumper crossmember

3

cabin

4

bumper cover

5

Under tension section

6

support part

7

pipe section

8th

Cylinder-piston arrangement

9

piston

10

piston rod

11

Beulrohr

12

accommodation space

13

discharge opening

14

freewheel

15

stiffening ring

16

stop element

17

Energieabsorptionsbox

18

sensor device

19

outfeed

20

spring element

21

hose element

22

pipe part

23

buckling and / or wave profile

24

ball closure

25

ramp

Claims (32)

Longitudinal member for a vehicle, in particular for a motor vehicle, wherein the at least one longitudinal carrier between a bumper cross member and a passenger compartment is arranged, characterized in that the longitudinal carrier ( 1 ) at least one directly or indirectly at the passenger compartment ( 3 ) fixedly arranged pipe section ( 7 ), in which for forming a cylinder-piston arrangement ( 8th ) a piston ( 9 ) slidably received, that one with the piston ( 9 ) connected piston rod ( 10 ) directly or indirectly with the bumper crossmember ( 2 ), that at least one energy absorption device ( 7 ; 9 ; 10 ; 11 ; 12 ; 14 ) which is in operative connection with the cylinder-piston arrangement ( 8th ), and that in a collision of the vehicle, in particular in a frontal collision, the cylinder-piston arrangement ( 8th ) with energy absorption by means of the energy absorption device ( 7 ; 9 ; 10 ; 11 ; 12 ; 14 ) is operable. Side member according to claim 1, characterized in that the at least one energy absorption device by at least one buckle tube ( 11 ) is formed, at least partially between the pipe section ( 7 ) and the bumper cross member ( 2 ) is arranged. Side member according to claim 2, characterized in that the bulge tube ( 11 ) the piston rod ( 10 ) At least partially, preferably completely, wrapped with a gap distance. Side member according to claim 2 or 3, characterized in that the bulge tube ( 11 ) with the pipe section ( 7 ) and / or with the bumper cross member ( 2 ) is firmly connected. Side member according to one of claims 2 to 4, characterized in that between the bulge tube ( 11 ) and the bumper cross member ( 2 ) at least one sealing element and / or at least one buffer element and / or at least one sensor device ( 18 ) is arranged. Side member according to one of claims 2 to 5, characterized in that the bulge tube ( 11 ) and the pipe section ( 7 ) in one piece as a pipe part ( 22 ) are manufactured, and that in Beulrohrbereich the pipe part ( 22 ) at least partially a buckling and / or wave profile ( 23 ) is trained. Side member according to one of claims 1 to 6, characterized in that the at least one energy absorption device by at least one in the pipe section ( 7 ) trained receiving space ( 12 ) is formed, in which at least one energy absorption medium is received. Side member according to claim 7, characterized in that the energy absorption medium is formed by a gas and / or by a foam material which is compressible under each energy absorption, and / or that the energy absorption medium is formed by a liquid, and / or that the receiving space ( 12 ) at least one discharge opening ( 13 ) in the manner of a throttle device through which the energy absorption medium, in particular the liquid, controlled from the receiving space ( 12 ) is dissipatable. Side member according to claim 8, characterized ge indicates that the discharge opening ( 13 ) is adjustable with respect to their size as a function of at least one collision parameter sensed by means of at least one sensor device. Side member according to claim 8 or 9, characterized in that the discharge opening ( 13 ), preferably by means of at least one discharge line, is connected to at least one collecting area and / or at least one stiffening area in such a way that the energy absorption medium displaced from the receiving space can be transferred into the collecting area and / or into the stiffening area and there to stiffen the stiffening area or to close Load paths collectable and durable. Side member according to one of claims 8 to 10, characterized in that by the from the receiving space ( 12 ) displaced energy absorption medium at least one safety device can be activated. Side member according to one of claims 7 to 11, characterized in that the energy absorption medium in the receiving space ( 12 ) is received under preload. Side member according to one of claims 7 to 12, characterized in that the energy absorption medium in a balloon-like hose element ( 21 ) recorded in the recording room ( 12 ) is arranged. Side member after one of the claims 7 to 13, characterized in that in the piston at least one Piston valve is provided, the openable upon actuation of the cylinder-piston assembly is. Side member according to one of claims 1 to 14, characterized in that the at least one energy absorption device by the piston ( 9 ) is formed such that on the piston ( 9 ) a preferably frictional freewheel ( 14 ) is arranged. Side member according to claim 15, characterized in that the freewheel ( 14 ) at least one clamping ball ( 24 ), which during the displacement of the piston ( 9 ) along one of the pistons ( 9 ) trained ramp ( 25 ) is displaced for a frictional clamping of the clamping ball ( 24 ) and thus the piston ( 9 ) relative to the pipe section ( 7 ). Side member after one of the claims 1 to 16, characterized in that the at least one energy absorption device formed by the piston is such that the piston in the Type of a mandrel is formed, and that the pipe section at least partially formed so that in a collision-related activity the cylinder-piston arrangement of the pipe section by means of the piston is expandable under energy absorption. Side member after one of the claims 1 to 16, characterized in that the at least one energy absorption device formed by the piston is such that the piston is formed is that in a collision-related actuation of the cylinder-piston assembly a correspondingly formed Umstülpbereich the pipe section is umstülpbar by the piston under energy absorption. Side member according to one of claims 1 to 18, characterized in that the at least one energy absorption device by the piston rod ( 10 ) is formed such that in a collision-related actuation of the cylinder-piston arrangement ( 8th ) first a displacement of the piston rod ( 10 ) in the undeformed state up to a preferably on the pipe section ( 7 ) trained stop and that subsequently in a further collision-induced force on the piston rod ( 10 ) this is deformable under energy absorption. Side member according to one of claims 1 to 19, characterized in that the at least one energy absorption device through the pipe section ( 7 ) is formed such that the pipe section ( 7 ) in the event of a collision-dependent actuation of the cylinder-piston arrangement ( 8th ) at least partially in the axial direction of the pipe section ( 7 ) is deformable under energy absorption. Side member according to one of claims 1 to 20, characterized in that at least one stiffening ring ( 15 ) on the pipe section ( 7 ) is provided for a radial reinforcement. Side member after one of the claims 1 to 21, characterized in that in the axial direction of the pipe section a plurality of spaced through openings is provided. Side member according to one of claims 1 to 22, characterized in that between the bumper cross member ( 2 ) and the piston rod ( 9 ) at least one energy absorption box ( 17 ) is arranged. Side member according to one of claims 1 to 23, characterized in that the cylinder-piston assembly ( 8th ) for an increase in the distance between the bumper cross member ( 2 ) and the pipe section ( 7 ) is operable so that the piston ( 9 ) together with the piston rod ( 10 ) we At least partially from the pipe section ( 7 ) is extendable for a displacement of the bumper cross member ( 2 ). Longitudinal member according to claim 24, characterized in that at least one sensor device, preferably at least one pre-crash sensor device, is provided, by means of which the extension of the cylinder-piston arrangement ( 8th ) is activated. Side member according to claim 24 or 25, characterized in that the extension of the cylinder-piston assembly ( 8th ) is wegbegrenzt, preferably by at least one stop element ( 16 ) is wegbegrenzt. Side member according to one of claims 24 to 26, characterized in that for the extension of the cylinder-piston assembly ( 8th ) a displacement medium in the pipe section ( 7 ) can be introduced and / or that a hydraulic and / or pneumatic and / or electric drive means is provided, which with the cylinder-piston arrangement ( 8th ) is coupled, that the piston ( 9 ) together with the piston rod ( 10 ) at least partially from the pipe section ( 7 ) is extendable. Side member after one of the claims 24 to 27, characterized in that the extension in dependence of at least one predetermined driving parameter, preferably the Driving speed, done. Side member according to one of claims 1 to 28, characterized in that a with the bumper cross member ( 2 ) connected extension part ( 19 ) at least with a portion in the piston rod ( 10 ) is slidably received relative thereto, and that the extension part ( 19 ) for a displacement of the bumper crossmember ( 2 ) is coupled to an energy store, preferably with a spring element ( 20 ). Side member according to one of claims 1 to 29, characterized in that the longitudinal carrier ( 1 ) at least one of the pipe section ( 7 ) in approximately in the vehicle longitudinal direction continuing Unterzugabschnitt ( 5 ), which at least partially seen in the vehicle vertical direction below the passenger compartment ( 3 ) is arranged. Side member according to one of claims 1 to 30, characterized in that at least one carrier part ( 6 ) is provided by means of an approximately vertical support of the pipe section ( 7 ) opposite the passenger compartment ( 3 ) he follows. Side member according to one of claims 1 to 31, characterized in that in each case two spaced apart in the vehicle transverse direction and approximately parallel to each other side members ( 1 ) are arranged on a front end and / or on a rear of the vehicle.