STEERING COLUMN FOR A MOTOR VEHICLE

Abstract

A steering column for a motor vehicle may include a holding device that is connectable to a chassis of a motor vehicle as well as a shifting device, which in the event of a crash is displaceable relative to the holding device along a displacement axis. The shifting device may be configured to receive a steering spindle. The steering column may further include a deformation element that is connected to the holding device and to the shifting device via a respective connection portion with respective fastening means. At least in some examples, the deformation element may include a deformation portion that is deformed about a deformation axis during displacement of the shifting device relative to the holding device. The deformation axis may be oriented substantially parallel to a surface normal of at least one connection portion in a center of the associated fastening means.

Claims

1.-10. (canceled)

11. A steering column for a motor vehicle, the steering column comprising: a holding device that is connectable to a chassis of the motor vehicle; a shifting device configured to receive a steering spindle, wherein in a crash event the shifting device is displaceable relative to the holding device along a displacement axis; and a deformation element connected via respective fastening means to the holding device via a first connection portion and to the shifting device via a second connection portion, the deformation element comprising a deformation portion that is deformed about a deformation axis during displacement of the shifting device relative to the holding device, wherein the deformation axis is oriented substantially parallel to a surface normal of at least one of the first connection portion or the second connection portion in a center of the associated fastening means.

12. The steering column of claim 11 wherein the deformation portion is configured such that during displacement of the shifting device relative to the holding device the deformation axis moves in a direction of the displacement axis in a manner substantially parallel to a starting position of the deformation axis.

13. The steering column of claim 11 wherein the deformation element is positioned on the holding device via the first connection portion and on the shifting device via the second connection portion, wherein at least one of the first connection portion or the second connection portion is perpendicular to the surface normal.

14. The steering column of claim 11 wherein the first connection portion and the second connection portion are disposed in a common plane.

15. The steering column of claim 11 wherein the deformation portion is bent around the deformation axis and comprises an inner region and an outer region that lie opposite one another and that lie substantially parallel to a plane spanned by the deformation axis and the displacement axis.

16. The steering column of claim 11 wherein the deformation portion is bent around the deformation axis and comprises an inner region and an outer region that lie opposite one another and that lie parallel to a plane spanned by the deformation axis and the displacement axis.

17. The steering column of claim 11 wherein at least one of the first connection portion or the second connection portion comprises form-fitting recesses that engage with mutually complementary form-fitting elements of at least one of the holding device or the shifting device.

18. The steering column of claim 11 wherein the deformation portion is a first deformation portion and the deformation element comprises a second deformation portion, wherein both the first and second deformation portions are connected to the second connection portion.

19. The steering column of claim 18 wherein the first connection portion includes a first part and a second part, wherein the first part of the first connection portion is in communication with the first deformation portion and the second part of the first connection portion is in communication with the second deformation portion.

20. The steering column of claim 18 wherein the first and second deformation portions are oriented parallel to one another, wherein the first and second connection portions are positioned perpendicular to planes in which the first and second deformation portions lie.

21. The steering column of claim 18 wherein the first and second deformation portions are oriented substantially parallel to one another, wherein the first and second connection portions are positioned perpendicular to planes in which the first and second deformation portions lie.

22. The steering column of claim 11 wherein the deformation portion is positioned perpendicular to a displacement direction next to the first and second connection portions.

23. The steering column of claim 11 wherein the first connection portion or the second connection portion comprises at least one of latching recesses for receiving a latch in a steering column that is adjustable in a longitudinal direction, or mounting bores for receiving a clamping spindle in a steering column that is adjustable in the longitudinal direction.

24. A steering column for a motor vehicle, the steering column comprising: a holding device that is connectable to a chassis of the motor vehicle; a shifting device configured to receive a steering spindle, wherein in a crash event the shifting device is displaceable relative to the holding device along a displacement axis; and a deformation element connected to the holding device via a first connection portion and to the shifting device via a second connection portion, the deformation element comprising a deformation portion that is deformed about a deformation axis during displacement of the shifting device relative to the holding device, wherein the deformation axis is substantially normal to at least one of the first connection portion or the second connection portion.

25. The steering column of claim 24 wherein the deformation element includes two deformation portions that are substantially parallel to one another.

26. The steering column of claim 24 wherein the first connection portion is connected to the first deformation portion along a tearing line, wherein during displacement of the shifting device relative to the holding device the deformation element tears along the tearing line.

27. The steering column of claim 24 wherein the deformation portion of the deformation element is U-shaped.

28. The steering column of claim 24 wherein the deformation element is mounted within a channel-shaped guide of the holding device.

29. The steering column of claim 24 wherein the holding device is configured as a sliding capsule.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0033] Preferred further embodiments and aspects of the present invention are explained in more detail by the description below of the figures, in which:

[0034] FIG. 1 shows a schematic perspective view of a steering column in a first exemplary embodiment;

[0035] FIG. 2 shows a schematic perspective view of the steering column from FIG. 1 in a pulled-apart illustration;

[0036] FIG. 3 shows a schematic perspective view of the deformation element of the steering column of FIGS. 1 and 2;

[0037] FIG. 4 shows a schematic perspective view of a deformation element in a second exemplary embodiment;

[0038] FIG. 5 shows a schematic perspective detailed view of the steering column of FIGS. 1 to 3 in a starting position;

[0039] FIG. 6 shows a schematic perspective detailed view of the steering column of FIG. 5 in a displaced position;

[0040] FIG. 7 shows a schematic perspective illustration of a steering column in a further exemplary embodiment;

[0041] FIG. 8 shows a schematic perspective illustration of the deformation element from FIG. 7;

[0042] FIG. 9 shows a schematic perspective illustration of a deformation element with a latching mechanism in a further exemplary embodiment;

[0043] FIG. 10 shows a schematic perspective illustration of a deformation element with a clamping device in a further exemplary embodiment.

DETAILED DESCRIPTION OF PREFERRED EXEMPLARY EMBODIMENTS

[0044] Preferred exemplary embodiments are described below with reference to the figures. Identical or similar elements or elements of identical action are denoted here by identical reference signs. To avoid redundancies, a repeated description of said elements in the description below will in part be omitted.

[0045] FIG. 1 shows a steering column 1 which comprises a holding device 2 which is connectable to the chassis of a motor vehicle, and a shifting device 3 which is displaceable relative to the holding device 2. A steering spindle 10 is arranged rotatably in the shifting device 3, which is designed here as an outer steering column, wherein a steering wheel (not illustrated) is connectable in a known manner to the front portion 12 of the steering spindle 10.

[0046] The holding device 2 comprises mounting recesses 20 via which the holding device 2 is connectable to the chassis of the motor vehicle. The holding device 2 furthermore has side cheeks 22 which partially surround the shifting device 3 and on which the shifting device 3 is guided. The shifting device 3 is displaceable relative to the holding device 2 in the direction of a displacement axis 300, which coincides with the steering spindle axis 100 in the exemplary embodiment shown, in the direction of the front of the vehicle.

[0047] Accordingly, in the event of a crash, the shifting device 3 can be displaced relative to the holding device 2 along the displacement axis 300 in the direction of the front of the vehicle in order, firstly, to achieve the effect that the steering wheel, which is connected to the steering spindle 10, is pushed out of the area of danger and, secondly, to provide a defined displacement distance along which applied crash energy can be further dissipated. In particular, crash energy which is applied to the steering wheel by a driver of the motor vehicle if the driver of the motor vehicle impacts against the steering wheel can be dissipated here.

[0048] In order to provide a defined displacement with a large portion of the crash energy being converted, a deformation element 4 is provided which is shown once again in detail in FIGS. 2 and 3.

[0049] The deformation element 4 is secured on the holding device 2 via a first connection portion 40 and is connected to the shifting device 3 via a second connection portion 42. Accordingly, during a relative displacement of the shifting device 3 in relation to the holding device 2 in the direction of the displacement axis 300, a corresponding force can be exerted on the deformation element 4 via the first connection portion 40 and the second connection portion 42, said force leading to a deformation of a deformation portion 44 of the deformation element 4.

[0050] In the exemplary embodiment shown, the deformation element 4 is designed as a bending and tearing tab, wherein the deformation portion 44 is fixedly connected to the second connection portion 42. In the preferred embodiment, the component is produced integrally as a sheet metal bent and punched part and comprises two deformation portions 44 which are oriented parallel to each other. Particularly preferably, the deformation part 4 comprises two first connection portions 40 which are of flat design and comprise one or more punched-out portions (=form-fitting recesses 402) or studs for forming form-fitting elements and therefore serve as a fastening element. The planes of the first and/or second connection portions 40, 42 are preferably oriented here parallel to the displacement plane 320. However, the respective deformation portion 44 is connected with respect to the first connection portion 40 along a tearing line 46 which provides a defined tearing behavior. Accordingly. during a relative displacement of the first connection portion 40 in relation to the second connection portion 42, as occurs by the displacement of the shifting device 3 in relation to the holding device 2 when a force is applied to the shifting device 3 in the event of a crash, the deformation portion 44 is deformed and at the same time the deformation element 4 tears open along the tearing line 46. By means of the deformation and the tearing of the deformation element 4, which is thereby designed as a bending and tearing tab, a defined energy absorption with a defined energy absorption characteristic of the deformation element 4 correspondingly occurs. In other words, the crash energy can be converted in a defined manner into deformation and tearing energy over the displacement distance along the displacement axis 30 that is predetermined by the displaceability of the shifting element 3 in relation to the holding element 2. The precise energy absorption characteristic of the deformation element 4 can be provided via the material selection, the choice of the material thickness and the design of the tearing line and of the rest of the geometry of the deformation element 4.

[0051] During a relative displacement of the second connection portion 42 in relation to the first connection portion 40, the deformation portion 44 of the deformation element 4 is deformed about a deformation axis 400. The deformation portion 44 is correspondingly reshaped or bent over around the deformation axis 400, and therefore the deformation axis 400 migrates forward in the direction of the front of the vehicle, but remains in its orientation substantially parallel to the starting orientation. The deformation portion 44 is correspondingly unwound around the deformation axis 400.

[0052] The deformation portion 4 is bent back on itself about the deformation axis 400, in other words is of U-shaped design, and correspondingly comprises an inert region 440 and an outer region 442 which lie opposite each other and which lie parallel to a plane spanned by the deformation axis 400 and the displacement axis 300.

[0053] In the deformation element 4, in each case two deformation portions 44 are directly arranged on the second connection portion 42, said deformation portions being arranged parallel to each other in such a manner that their respective deformation axes 400 are also arranged parallel to each other, wherein the inner region 440 of the deformation portion 44, which inert region is arranged on the second connection portion 42, can be supported on the outer region 442 as long as the deformation portion 44 is deformed about the deformation axis 400. Accordingly, a defined deformation takes place here. Furthermore, because of the U-shaped connection of the deformation portion 44 to the second deformation portion 42 and the corresponding supporting of the inner region 440 on the outer region 442, which is likewise connected at a 90° angle to the first connection portion 40, a very stable support of the deformation portion 44 is ensured even during the deformation, and therefore a defined deformation can be carried out with little requirement for construction space.

[0054] Form-fitting recesses 402 are provided on the first connection portion 40 as fastening means which can be brought into engagement with mutually complementary form-fitting elements 24 of the holding device 2. As emerges for example from FIG. 2, the deformation element 4 can be placed from above onto the form-fitting elements 24 with the form-fitting recesses 402, and therefore a simple fastening means arises for securing the deformation element with respect to the holding device 2.

[0055] The deformation element 4 is furthermore connectable to its second connection portion 42 via a mounting bolt 30 which projects out of the shifting device 3 radially with respect to the steering spindle axis 100, wherein a mounting bore 422 is provided as fastening means in the second connection portion 42, said mounting bore being penetrated by the mounting bolt 30. The deformation element 4 can then be secured via a lock nut 32.

[0056] The shifting device 3 can thereby be secured in a simple manner on the holding device 2, and therefore, for the connection of the deformation element 4 both to the holding device 2 and to the shifting devices, a single lock nut via which the deformation element 4 is connected both to the shifting device 3 via the second connection portion 42 and to the holding device 2 via the first connection portion 40 merely has to be tightened. At the same time, the tightening of the lock nut 32 makes it possible to connect the shifting device 3 to the holding device 2 in a displaceable manner.

[0057] In the deformation element 4 shown in FIGS. 1 to 3, the respective force engagement points, i.e. in particular the first connection portion 40 with the form-fitting recesses 402 and the second connection portion 42 with a mounting bore 422 are therefore located in the immediate vicinity both of the deformation portion 44 and of the deformation axis 400, and therefore a defined deformation of the deformation portion 44 about the deformation axis 400 takes place.

[0058] FIGS. 5 and 6 show, in a detailed illustration of the steering column 1 of FIGS. 1 to 3, the mounting of the deformation element 4 in a corresponding channel-shaped guide 26 of the holding device 2, wherein the mounting bolt 30 of the shifting device 3 extends through an elongated hole 28 of the holding device 2 and is then correspondingly held in a displaceable manner via the second connection portion 42, which also serves as a washer in this form, and the lock nut 32. The second mounting bolt 30 extends through a further elongated hole 28 and is likewise secured via a lock nut 32.

[0059] The channel-shaped guide 26 is of U-shaped design and, in addition to the channel base 280, also comprises two mutually opposite channel walls 228 which are oriented parallel to each other and are oriented parallel to the inner region 440 and the outer region 442 of the deformation portion 44 in such a manner that both the inner region 440 and the outer region 442 can be supported on the channel walls 228.

[0060] FIG. 6 shows the steering column 1 in a displaced position in which the deformation portion 44 around the deformation axis 400 is unwound, the shifting device 3 is correspondingly displaced in relation to the holding device 2 in the direction of the front of the vehicle and the mounting bolts 30 have correspondingly arrived at the front end of the elongated holes 28 of the holding device 2. The shifting device 3 has accordingly carried out a displacement distance in relation to the holding device 2 in the direction of the front of the vehicle, said displacement distance corresponding to the length of the elongated holes 28, and at the same time the deformation element 4 is deformed in its deformation portion 44. It correspondingly arises that, by means of the deformation of the deformation element 4 in its deformation portion 44, a defined energy absorption of the applied crash energy has taken place.

[0061] The deformation element 4 illustrated in FIGS. 1 to 3, 5 and 6 comprises the deformation axis 400 which is arranged substantially both parallel to the direction of the surface normal 200 of the first connection portion 40 and parallel to the direction of the second connection portion 42.

[0062] The fact that the deformation axis 400 is arranged substantially parallel to the direction of the surface normal 200 is understood as meaning that the spatial angle between the deformation axis 400 and the direction of the surface normal 200 lies within a range of 0° to 10°, preferably at an angle of 0° to 5°, particularly preferably at precisely 0° and is therefore ideally parallel.

[0063] The deformation axis 400 or the deformation axes 400 of the deformation element 4 is or are correspondingly also arranged substantially parallel to the radial direction of the shifting device 3, which radial direction is defined, for example, by the mounting bolts 30.

[0064] The effect which can be achieved by the deformation axis 400 being arranged substantially parallel to the direction of the surface normal and therefore also perpendicular to the displacement plane 320 is that a defined deformation of the deformation portion 44 is achieved, which deformation does not require any additional construction space but rather moves substantially in the construction space predetermined by the deformation element 4. This correspondingly results in a particularly compact construction of the deformation element 4 and therefore of the entire steering column 1. The deformation element 4 can furthermore be adapted in a simple manner to the respective specifications of the motor vehicle, and therefore there is great design freedom for the bending tab or a corresponding bending and tearing tab.

[0065] It furthermore arises that, by means of the parallel arrangement of the deformation axis 400 with respect to the direction of the surface normal 200, simple mounting can be achieved since an insertion of the deformation element 4 in the direction of the deformation axis 400 is made possible and, accordingly, by simple plugging together of the holding device 2, of the shifting device 3 and of the deformation element 4 and subsequent securing of the three elements to one another via a single lock nut 32, the mounting process can be ended.

[0066] FIG. 4 provides a further exemplary embodiment of a deformation element 4 which comprises a first connection portion 40 for connection to a holding device via form-fitting recesses 402 which serve as fastening means. The second connection portion 42 can be connected, for example, to the shifting device 3 via a mounting bore 422. The first connection portion 40 and the second connection portion 42 are arranged in a plane which is formed parallel to the displacement plane 320.

[0067] The deformation portion 44 is in turn designed in such a manner that an inner region 440 of the deformation portion 44 is connected directly to the second connection portion 42, and an outer region 442 of the deformation portion 44 is connected to the first connection portion 40. Instead of a tearing line, a slot 460 which clearly separates the deformation portion 44 from the first connection portion 40 is provided here.

[0068] The deformation axis 400 is in turn arranged substantially parallel to the direction of the surface normal 200.

[0069] FIGS. 7 and 8 show a steering column 1 in a further exemplary embodiment, wherein the steering column 1 in this exemplary embodiment comprises a holding device 2 in the form of a sliding capsule which is secured to the chassis of the motor vehicle and on which a shifting device 3 in the form of the steering column 1 and in particular of the bracket of the steering column is provided. In the event of a crash, the steering column 1 and in particular the shifting device 3 move in relation to the holding devices 2, which are designed as sliding capsules, in the direction of the front of the vehicle. In order to achieve a defined displacement of the shifting device 3 in relation to the holding device 2, a deformation element 4 is in turn provided which is secured via a form-fitting element 34, which is arranged on the shifting device 3 and which engages in a form-fitting recess 402 of the deformation element 4. Furthermore, a mounting bore 422 is provided via which the deformation element 4 is secured on the holding device 2 by the bolt of the sliding capsule penetrating the mounting bore 422.

[0070] A deformation portion 44 which is arranged perpendicular to the displacement plane 320 is in turn provided.

[0071] The mounting bore 422 is provided in a second connection portion 42, and the form-fitting recess 402 is provided in a first connection portion 40 of the deformation element 4.

[0072] The deformation portion 44 is connected directly to the first connection portion 40 and is connected to the second connection portion 42 via a tearing line 46. A deformation of the deformation portion takes place about the axis defined by the deformation axis 400 when a relative displacement of the first connection portion 40 with respect to the second connection portion 42 takes place whenever the shifting device 3 is displaced in relation to the holding device 2.

[0073] In the exemplary embodiment, the deformation axis 400 is oriented parallel to the direction of the surface normal 200 of the second connection portion 42, wherein the direction of the surface normal 200 is arranged orthogonally to the displacement plane 320.

[0074] FIG. 9 shows, in a further exemplary embodiment, a further deformation element 4 in which a first connection portion 40 is provided which can be secured in turn to the shifting device 3 via form-fitting recesses 402. A second connection portion 42 is provided which comprises latching recesses 424 which can come into engagement with a latch 50 which serves as the fastening means. The latch 50 is held in a steering column, for example via a clamping spindle 52 of a clamping mechanism, said clamping spindle permitting a longitudinal adjustment of the shifting device relative to the holding device in order to permit an exact positioning of the steering wheel with respect to a driver. The clamping spindle 52 bears the latch 50 and ensures that the latch 50 with its corresponding latching hooks enters into engagement with the latching recesses 442 in the second connection portion 42 of the deformation element 4 when the steering column or steering column position is locked in its position. Such a device is basically known.

[0075] The deformation portion 44 is in turn connected both to the first connection portion 40 and to the second connection portion 42 and is designed in such a manner that the deformation axis 400, about which the deformation portion 44 is deformed during a relative displacement of the first connection portion 40 in relation to the second connection portion 42, is arranged substantially parallel to the direction of the surface normal 200 both of the first connection portion 40 and also parallel to the direction of the surface normal 200 of the second connection portion 42. Furthermore, the direction of the surface normal 200 is arranged orthogonally to the displacement plane 320 in which the displacement axis 300 lies.

[0076] FIG. 10 shows, in a further exemplary embodiment, a deformation element 4 which comprises a first connection portion 40 which has form-fitting recesses 402, by means of which the first connection portion 40 can be brought into engagement with the holding device 2. Furthermore, a second connection portion 42 is provided which comprises mounting bores 422 which can be brought into engagement with the shifting device 3 via a clamping spindle 52. The deformation portion 44 is arranged in such a manner that the deformation axis 400 is arranged substantially parallel to the direction of the surface normal 200 of the first connection portion 400. Furthermore, the direction of the surface normal of the first connection portion 400 is orthogonal with respect to the displacement plane 320.

[0077] To the extent useable, all of the individual features which are illustrated in the individual exemplary embodiments can be combined and/or interchanged with one another without departing from the scope of the invention.

LIST OF REFERENCE SIGNS

[0078] 1 Steering column [0079] 10 Steering spindle [0080] 12 Front portion [0081] 100 Steering spindle axis [0082] 2 Holding device [0083] 20 Mounting recess [0084] 22 Side cheek [0085] 24 Form-fitting element [0086] 26 Channel-shaped guide [0087] 28 Elongated hole [0088] 200 Surface normal [0089] 280 Channel base [0090] 282 Channel wall [0091] 3 Shifting device [0092] 30 Mounting bolt [0093] 32 Lock nut [0094] 34 Form-fitting element [0095] 300 Displacement axis [0096] 320 Displacement plane [0097] 4 Deformation element [0098] 40 First connection portion [0099] 42 Second connection portion [0100] 44 Deformation portion [0101] 46 Tearing line [0102] 400 Deformation axis [0103] 402 Form-fitting recess [0104] 422 Installation bore [0105] 424 Latching recess [0106] 440 Inner region [0107] 442 Outer region [0108] 460 Slot [0109] 50 Latch [0110] 52 Clamping spindle