ADJUSTING DRIVE FOR A STEERING COLUMN AND STEERING COLUMN FOR A MOTOR VEHICLE

Description

State of the art

[0001] The invention relates to an adjustment drive for a steering column for a motor vehicle, comprising a threaded spindle with an external thread that engages a corresponding internal thread of a spindle nut, wherein one of the external thread and a thread groove of the internal thread have corresponding thread flanks that can be supported axially against one another in a sliding manner. Furthermore, the invention comprises a steering column with such an adjustment drive.

[0002] A motor-adjustable steering column is mounted on the vehicle body in its front section, in the direction of travel, by a support structure. At the rear end, facing the driver's position, a steering input is mounted for manual input of steering commands, for example, a steering wheel rotatable about a longitudinal axis. The steering wheel can be attached to a steering spindle mounted in an actuating unit for rotation about the longitudinal axis. To achieve longitudinal adjustment of the steering input relative to the driver's position, the spindle is accommodated in a casing unit, also known as a guide box, outer casing tube, or box-type rocker, which can be telescopically displaced in the longitudinal direction specified by the longitudinal axis.

[0003] A height adjustment of the steering input can be achieved by mounting the actuating unit or a casing unit receiving it transversely to the longitudinal axis so that it can pivot up and down relative to the vehicle body.

[0004] It is known in the art to provide a motorized adjustment drive with a drive unit having a drive motor, which is connected - usually via a gear - to a spindle drive comprising a threaded spindle engaging a spindle nut. The drive unit drives the threaded spindle and the spindle nut in rotation relative to one another about the spindle axis, whereby they can be moved translationally towards or away from one another in the direction of the spindle axis, depending on the direction of rotation. In one embodiment, the so-called rotary spindle drive, the threaded spindle is driven in rotation about its spindle axis by the drive unit, which is fixedly connected to the adjusting unit or the support unit, and engages the spindle nut, which is fixedly attached to the adjustable support unit or the adjusting unit with respect to rotation about the spindle axis. Axial, i.e.In the direction of the spindle axis, the threaded spindle is supported on the support unit or the adjusting unit, and the spindle nut is supported accordingly on the adjusting unit or the support unit, so that a rotary drive of the threaded spindle causes a translational adjustment of the support unit and the adjusting unit relative to one another. In an alternative embodiment, known as a plunger spindle drive, the threaded spindle is non-rotatably coupled to the support unit or the adjusting unit with respect to rotation about the spindle axis, and the spindle nut is rotatable but fixed in the direction of the spindle axis and mounted on the adjusting unit or the support unit.As in the first embodiment, the threaded spindle is supported axially on the support unit or the adjusting unit in the direction of the spindle axis, and the spindle nut is supported correspondingly on the adjusting unit or the support unit, so that the threaded spindle can be translated by the drive unit in the direction of the spindle axis. In both embodiments, the adjustment drive has a motor-driven spindle drive acting between the support unit and the adjusting unit, by which the adjusting unit can be adjusted relative to the support unit. An adjustment drive of this type is described, for example, in DE 10 2017 207 561 A1 and DE 10 2020 202 196 A1, which also discloses the preamble of the independent claim.

[0005] In order to realize a longitudinal adjustment of the actuating unit in the direction of the longitudinal axis, a spindle drive of an adjustment drive can be arranged between the actuating unit and a casing unit which receives it in an axially longitudinally displaceable manner and which is connected to the support unit, and wherein the spindle axis can be aligned substantially parallel to the longitudinal axis.

[0006] For height adjustment, an adjustment drive can be arranged between the support unit and a height-adjustable actuating unit mounted on it.

[0007] Motorized longitudinal and height adjustment on a steering column can be implemented individually or in combination.

[0008] In the spindle drive, the axially adjacent thread flanks—the tooth flanks on the thread tooth of the external thread of the threaded spindle and the corresponding groove flanks in the thread groove of the internal thread—are subjected to the axial adjustment force and, during circumferential adjustment, slide relative to each other. To minimize frictional losses and wear, a lubricant, usually grease, is applied to reduce friction. The lubricant adheres to the threaded spindle and the spindle nut. This ensures that the contact areas on the thread flanks in sliding contact are sufficiently lubricated for virtually their entire service life during adjustment to adjust the steering wheel position.A more frequent adjustment occurs, for example, in autonomous driving, when the steering column is retracted from the operating position to a stowed position when switching between manual and autonomous driving mode, and vice versa. Such automated adjustment is also implemented in conventional driving mode to improve comfort when getting in and out of the vehicle.

[0009] Due to frequent operation, the lubricant can be displaced from the thread flanks, which are in direct frictional contact between the thread tooth and the corresponding thread groove, and collect elsewhere in the spindle drive. This can impair lubrication and lead to increased friction and wear.

[0010] In view of the problems explained above, it is an object of the present invention to improve lubrication and reduce friction and wear. Description of the invention

[0011] This object is achieved according to the invention by the adjustment drive having the features of claim 1 and the steering column according to claim 13. Advantageous further developments emerge from the subclaims.

[0012] In an adjustment drive for a steering column for a motor vehicle, comprising a threaded spindle with an external thread which engages in a corresponding internal thread of a spindle nut, wherein one of the external thread and a thread groove of the internal thread have corresponding thread flanks which can be supported axially against one another in a sliding manner, it is provided according to the invention that at least one thread flank has at least one recessed lubricant receptacle.

[0013] The external thread has a thread tooth that extends helically, at least in sections, and which has a tooth flank on each of its two axial surfaces. The thread groove of the internal thread has groove flanks on both axial sides, which represent thread flanks corresponding to the tooth flanks. Depending on the adjustment direction, the friction pair in the contact area of ​​corresponding thread flanks is loaded with the axial adjustment force of the adjustment drive. It is possible for the thread flanks designed according to the invention to comprise a tooth flank of the thread tooth and / or a groove flank of a thread groove.

[0014] According to the invention, a lubricant receptacle, which can also be synonymously referred to as a lubricant receptacle recess, can be designed as a recess or concave indentation, for example in the form of a lubricant pocket or trough. The lubricant receptacle is introduced into the surface of the thread flank, also referred to as the flank surface, in the contact area where the tooth flank and groove flank can come into sliding contact during thread engagement. Because the lubricant receptacle can be at least partially filled with a lubricant, it forms an open lubricant reservoir, i.e., a lubricant storage device arranged in the contact area of ​​the thread flank.

[0015] One advantage of the invention is that a larger supply of lubricant can be stored in the lubricant reservoir, from which lubricant can be released directly into the contact area between the thread flanks that are in frictional contact there. Because the lubricating film in the contact area is relatively thin, and only lubricant squeezed out by axial load needs to be replaced, the lubricant held in the lubricant holder according to the invention can ensure long-lasting lubrication of the spindle drive, preferably sufficient over the entire service life. This also applies to applications with particularly frequent adjustment of the steering column, such as a steer-by-wire steering column for autonomous driving, or other automated comfort functions. This effectively reduces friction and wear, ensuring long-term, trouble-free operation.

[0016] During operation, the lubricant reservoir is filled with a lubricant, preferably a lubricating grease. The lubricant can have a higher viscosity than the recommended lubricant, so that under typical operating conditions, a sufficient, but not excessive, amount of lubricant is always drawn from the reservoir into the contact area. The lubricant can preferably be filled during assembly of the actuator, thus ensuring long-term, trouble-free operation.

[0017] It is advantageous that the lubricant receptacle is designed to be open axially on one side.

[0018] This creates a concave recess or depression with an opening only toward the contact area of ​​the thread flank. This opening is covered or closed during thread engagement by the axially opposite thread flank, which slides in contact with the thread. For example, a lubricant receptacle formed in a tooth flank is covered by the corresponding groove flank. This ensures that the lubricant can reach the thread flanks reliably and precisely.

[0019] It can be provided that a plurality of lubricant receptacles are formed in each thread flank. For example, several lubricant receptacles can be arranged at a distance from one another in the circumferential direction over the entire length of the threaded spindle, which can engage with the spindle nut during adjustment. This ensures a uniform, reliable distribution of the lubricant.

[0020] A preferred embodiment can be realized by having the lubricant receptacle with an elongated lubrication groove. A lubrication groove forms an open lubrication channel, which can be formed into a thread flank in the shape of a trough or groove. One advantage of this is that the circumferentially and / or radially elongated shape allows the lubricant to be delivered over a larger contact area. The lubricant can be distributed longitudinally within the lubrication groove, ensuring even, reliable lubrication even under high loads.

[0021] An advantageous development of the above-mentioned embodiment is that the lubrication groove is spiral-shaped at least in sections. In the spiral course, the lubrication groove extends in an arcuate manner in the radial direction, inclined against the longitudinal axis of the spindle or of the thread. The lubrication groove can be designed in the helical axial surface formed by the thread flank, similar to a thread groove of a flat thread, extending radially from the inside to the outside in an arcuate manner. On the external thread, a lubrication groove can extend from the root circle of the external thread of the threaded spindle, corresponding to the core diameter of the external thread, preferably to the tooth tip, corresponding to the external diameter of the external thread, i.e. over the radial height of the thread tooth. Analogously, a lubrication groove in the internal thread of the spindle nut can extend from the base circle of the thread groove in the groove flank, i.e.run in an arc from the outer diameter radially inwards, preferably up to the inner diameter of the internal thread, i.e. over the radial height of the thread groove. One advantage is that a thread groove can supply a larger circumferential and radial section of the contact surface with lubricant. A further advantage is that when the threaded spindle and spindle nut rotate relative to each other in a given direction of rotation, the lubricant is pumped radially along the lubrication groove, similar to the operating principle of a spiral pump. Depending on the direction of rotation and the sense of rotation of the spiral shape, lubricant can be pumped radially from the inside to the outside or vice versa. This enables optimized distribution of the lubricant. In particular, lubricant that has been radially pressed out of the contact area over the course of operation can be pumped back into the contact area for lubrication via the spiral lubrication groove.This can reduce lubricant loss and achieve long-term, optimized lubrication.

[0022] The spiral-shaped configuration can preferably provide for a lubrication groove to extend over a circumferential section of less than 360° over the radial height of the thread tooth or thread groove. In this way, two or more lubrication grooves can preferably be arranged at a distance in the circumferential direction per revolution. Each lubrication groove can be designed in the manner of a spiral arm.

[0023] Preferably, a plurality of spiral-like lubrication grooves can be arranged distributed over the entire length of the external thread and / or the internal thread.

[0024] Furthermore, it can be advantageous for two lubrication grooves to be designed in an opposite spiral shape. For example, the first lubrication groove can run in a spiral shape from the inside out during one rotation direction, for example clockwise, and the other, opposite lubrication groove can run in the same direction of rotation from the outside in. During a relative rotation of the threaded spindle and spindle nut in a given direction of rotation, the lubricant can be pumped from the inside out in one lubrication groove, and simultaneously from the outside in the other, opposite lubrication groove. This allows lubricant that has escaped from the contact area both radially inwards and outwards to be pumped back into the contact area, thus further optimising lubrication.

[0025] Opposing lubrication grooves can be formed on a thread tooth or a thread groove, or on a thread tooth in the opposite direction to a corresponding thread groove. In particular, it is conceivable and possible for opposing lubrication grooves to be arranged on tooth and groove flanks that are in sliding contact with each other.

[0026] It is possible for lubricant receptacles to be arranged on one or both tooth flanks of a thread tooth and / or on one or both groove flanks of a thread groove. Because lubricant receptacles according to the invention are implemented either only on the thread tooth or in the thread groove, or on both the thread tooth and the thread groove, the lubricant distribution can be adapted to the respective requirements. In addition, lubricant receptacles can be provided axially on one side or both sides of the thread flanks of the thread groove and thread tooth. This can enable further optimization of the lubricant distribution, for example, to keep it in the area of ​​the internal thread.

[0027] The tooth tip, which is defined by the preferably cylindrical outer circumferential surface of the threaded spindle, is preferably smooth over the entire length of the threaded spindle and has no radial indentations or the like. This prevents excessive lubricant from accumulating radially outside the thread flanks between the tooth tip of the thread tooth and the groove base of the thread groove.

[0028] The threaded spindle and / or the spindle nut can preferably comprise a plastic material. The threaded spindle in the region of the thread tooth and / or the spindle nut in the region of the thread groove can be formed from a plastic material, at least in sections. This allows advantageous sliding properties to be achieved. Production from a thermoplastic polymer using plastic injection molding is advantageous. This enables the lubricant receptacles to be implemented with ease in terms of production technology. For example, lubrication grooves can be formed into a thread tooth or a thread groove using a relatively simply constructed mold, which allows for simple forced demolding of the finished injection-molded part from an injection mold, which in principle can be constructed just as simply as in the prior art without lubricant receptacles according to the invention.

[0029] Additionally or alternatively, the threaded spindle and / or the spindle nut may be made of a metallic material. The threaded spindle in the area of ​​the thread tooth and / or the spindle nut in the area of ​​the thread groove may be formed, at least in sections, from a metallic material, such as steel or non-ferrous metal.

[0030] The threaded spindle and / or the spindle nut can have a core made of a metallic material that is coated with a plastic, at least in sections in the area of ​​the tooth flanks or groove flanks. For example, such a metal core can be overmolded with a thermoplastic polymer in the area of ​​the thread. This allows for high rigidity with low friction.

[0031] This allows a low-friction and low-wear material pairing to be realized between the opposing thread flanks, preferably as a metal-plastic combination or plastic-plastic combination.

[0032] To implement automated adjustment, it is preferably provided that a motor drive unit is coupled to the threaded spindle or the spindle nut in such a way that the threaded spindle and the spindle nut can be driven in rotation relative to each other. The drive unit comprises an electric motor, which is coupled to the threaded spindle or the spindle nut for rotational drive, for example, via a worm gear or the like. The electrical control of the motor by a control unit of the motor vehicle enables automated adjustment.

[0033] In a steering column for a motor vehicle, having a support unit which can be attached to a vehicle body and by which an adjusting unit is held, in which a steering spindle is rotatably mounted, and having an adjusting drive which comprises a threaded spindle which engages with an external thread in a spindle nut, and a drive unit which is coupled to the threaded spindle or the spindle nut in such a way that the threaded spindle and the spindle nut can be driven in rotation relative to one another, wherein the adjusting drive is connected to the support unit or the adjusting unit, it is provided according to the invention that the adjusting drive is designed according to one or combinations of the embodiments described above.

[0034] The inventive design of the adjustment drive(s) enables reliable and maintenance-free operation over the service life of the steering column, particularly even with frequent adjustment.

[0035] In order to adapt to the respective conditions, the adjustment drive can be designed in a conventional manner as a rotary spindle drive or as a plunger spindle drive.

[0036] It is advantageous that the steering column according to the invention is designed as a steer-by-wire steering column. This is an electric steering input device in which the manual steering handle is not mechanically connected to the wheels to be steered, but rather interacts with angle or torque sensors that detect the manually input steering command and generate an electrical control signal from it. This signal is transmitted to a steering actuator, which, using an electric actuator, sets the steering angle of the wheels in accordance with the steering command. Such steering systems are preferably used in autonomously operated vehicles. Description of the drawings

[0037] Advantageous embodiments of the invention are explained in more detail below with reference to the drawings. In detail: Figure 1 shows a schematic perspective view of a steering column according to the invention, Figure 2 shows a further perspective view of the steering column according to the invention according to Figure 1 from a different viewing angle, Figure 3 shows an adjustment drive according to the invention in a schematic perspective view, Figure 4 shows a threaded spindle according to the invention in a perspective view, Figure 5 shows a threaded spindle according to the invention in an enlarged perspective view, Figure 6 shows a threaded spindle according to the invention in a partial view cut through the longitudinal axis. Embodiments of the invention

[0038] In the various figures, identical parts are always provided with the same reference symbols and are therefore usually named or mentioned only once. Figure 1shows a steering column 1 according to the invention in a schematic perspective view from the bottom left obliquely towards the rear end, based on the direction of travel of a vehicle not shown, where on the right in the illustration a steering wheel not shown here is held in the operating area. Figure 2 shows the steering column 1 in a view from the opposite side, i.e. from the top left.

[0039] The steering column 1 comprises a support unit 2, which is designed as a console and has fastening means 21 in the form of mounting holes for attachment to a vehicle body (not shown). The support unit 2 holds an actuating unit 3, which is housed in a casing unit 4—also referred to as a guide box or box-type rocker arm.

[0040] The actuating unit 3 has a casing tube 31 in which a steering spindle 32 is mounted so as to be rotatable about a longitudinal axis L, which extends axially in the longitudinal direction, ie in the direction of the longitudinal axis L. At the rear end, a fastening section 33 is formed on the steering spindle 32, to which a steering wheel (not shown) can be attached.

[0041] The actuating unit 3 is accommodated in the casing unit 4 in a telescopically displaceable manner in the direction of the longitudinal axis L in order to realize a longitudinal adjustment in order to be able to position the steering wheel connected to the steering spindle 32 forwards and backwards in the longitudinal direction relative to the support unit 2, as indicated by the double arrow parallel to the longitudinal axis L.

[0042] The casing unit 4 is mounted in a pivot bearing 22 on the support unit 2 so as to be pivotable about a horizontal pivot axis S lying transversely to the longitudinal axis L. In the rear area, the casing unit 4 is connected to the support unit 2 via an adjusting lever 41. By rotating the adjusting lever 41, the casing unit 4 can be pivoted relative to the support unit 2 about the pivot axis S, which is horizontal in the installed state, whereby an adjustment of a steering wheel attached to the fastening section 33 can be carried out in the height direction H, which is indicated by the double arrow.

[0043] A first adjustment drive 5 for longitudinally adjusting the actuating unit 3 relative to the casing unit 4 in the direction of the longitudinal axis L has a spindle drive with a spindle nut 51, into which a threaded spindle 52 extending along a threaded axis G, the spindle axis, engages, i.e., its external thread is screwed into the corresponding internal thread of the spindle nut 51. The threaded axis G runs essentially parallel to the longitudinal axis L.

[0044] The spindle nut 51 is mounted rotatably about the thread axis G in a bearing housing 53, which is rigidly connected to the casing unit 4. In the direction of the thread axis G, the spindle nut 51 is axially supported on the casing unit 4 via the bearing housing 53. Accordingly, the adjustment drive 5 is a so-called plunger spindle drive.

[0045] The threaded spindle 52 is connected to the actuating unit 3 by means of a fastening element 54 formed at its rear end via a transmission element 34, namely fixed in the direction of the axis G or the longitudinal axis L and fixed with respect to rotation about the axis G. A so-called submersible spindle drive is realized by the rotationally drivable spindle nut 51 and the rotationally fixed threaded spindle 52.

[0046] The transmission element 34 extends from the actuating unit 3 through a slot-shaped through-opening 42 in the casing unit 4. To adjust the steering column 1 in the longitudinal direction, the transmission element 34 can be moved freely in the through-opening 42 in the longitudinal direction.

[0047] The adjustment drive 5 has an electric drive motor 55, by which the spindle nut 51 can be driven in rotation with respect to the axis G relative to the fixed threaded spindle 52. Depending on the direction of rotation of the drive motor 55, the threaded spindle 52 can be displaced translationally relative to the spindle nut 51 in the direction of the threaded axis G, so that the adjusting device 3 connected to the threaded spindle 52 is correspondingly adjusted relative to the casing unit 4 connected to the spindle nut 51 in the direction of the longitudinal axis L.

[0048] In Figure 1It can also be seen how a second adjustment drive 6 for adjustment in the height direction H is attached to the steering column 1. This adjustment drive 6 comprises a spindle nut 61 into which a threaded spindle 62 engages. The threaded spindle 62 is mounted in a bearing housing 63, which is fastened to the casing unit 4, rotatably mounted about the axis G and axially supported on the casing unit 4, and can be driven by an electric drive motor 65 selectively in both directions of rotation about the axis G. Accordingly, the adjustment drive 6 is a so-called rotary spindle drive.

[0049] The spindle nut 61 is fixedly mounted on the adjusting lever 41 with respect to rotation about its threaded axis, which is mounted on the support unit 2 so as to be rotatable about a pivot bearing, and whose other arm is connected at the other end to the casing unit 4.

[0050] By rotating the threaded spindle 61 - depending on the direction of rotation of the drive motor 65 - the spindle nut 61 can be displaced translationally relative to the threaded spindle 52, so that the casing unit 4 connected to the spindle nut 41 via the adjusting lever 41, together with the adjusting device 3 accommodated therein, can be adjusted up or down in the height direction H relative to the support unit 2, as indicated by the double arrow.

[0051] Figure 3 shows the adjustment drive 5 designed as a submersible spindle drive in an enlarged view. Figure 4 shows the threaded spindle 51 designed according to the invention separately in an enlarged view, and Figure 5 shows a further enlarged detail from Figure 4 .

[0052] The threaded spindle 51 has a helically rotating thread tooth 56. This has two axial thread flanks 57, which form the tooth flanks. Figure 5The visible thread flank 57 facing the viewer has a plurality of lubrication grooves 58 which form groove-shaped, concavely formed lubricant receptacles in the sense of the invention.

[0053] The lubrication grooves 58 are spaced apart by a distance U, measured circumferentially across the outer diameter of the threaded spindle 51. In the example shown, all lubrication grooves 56 distributed along the longitudinal extent of the threaded spindle each have the same distance U. However, it is also conceivable and possible that different distances U may be provided.

[0054] The tooth head 590, which is limited by the cylindrical outer peripheral surface of the threaded spindle 51, has no radial indentations.

[0055] Figure 6shows a schematic axial partial view of a circumferential section of the tooth flank 57. The curved, spiral course of the lubrication grooves 58 can be seen therein. In other words, they are shaped similarly to spiral arms, whereby these - as in Figure 5 shown - each have a distance U in the circumferential direction. In the example shown, they run from the tooth root 591 to the tooth tip 590 over the entire radial height of the thread tooth 56. Their radial extension is curved counterclockwise from the inside to the outside.

[0056] In the assembled, operational state of the adjustment drive 5, the lubrication grooves 58 are at least partially filled with a lubricant, preferably with a lubricating grease.

[0057] It is possible that on the Figures 4 and 5 The axial tooth flank 57 facing away from the viewer also has lubrication grooves 58 or other shaped lubricant receptacles in accordance with the invention.

[0058] In the groove flanks of the thread groove of the internal thread of the spindle nut 51, not shown here, lubrication grooves 58 of essentially the same design can be formed additionally or alternatively.

[0059] The threaded spindle 52 and the spindle nut 51 can be made of a metallic material and / or a plastic. It is advantageous for the threaded spindle 52 to be made of a plastic, preferably a thermoplastic polymer, at least in the area of ​​the tooth flanks 57 of the threaded tooth 56. This can be formed as an injection-molded part, with which, for example, a metallic core is overmolded. The lubrication grooves 58 can preferably be formed into the tooth flanks 57 by means of a plastic injection molding process. List of reference symbols

[0060] 1Steering column 2Support unit 21Fasteners 22Pivot bearing 3Adjusting unit 31Steering tube 32Steering spindle 34Transmission element 4Steering unit 41Adjusting lever 42Through opening 5, 6Adjustment drive 51, 61Spindle nut 52, 62Threaded spindle 53, 63Bearing housing 54Fastening element 55, 65Drive motor 56Threaded tooth 57Tooth flank 58Lubrication groove 590Tooth tip 591Tooth root LLongitudinal axis HHeight direction GGread axis UDistance

Claims

1. Adjustment drive (5) for a steering column (1) for a motor vehicle, comprising a threaded spindle (52) having an external thread, engaging with a corresponding internal thread of a spindle nut (51), wherein a thread tooth (56) of the external thread and a thread groove of the internal thread have corresponding axially sliding thread flanks (57) which are braced against each other, characterized in that at least one thread flank (57) comprises at least one recessed lubricant uptake (58).

2. Adjustment drive according to Claim 1, characterized in that the thread flanks comprise a tooth flank (57) of the thread tooth (56) and / or a groove flank of a thread groove.

3. Adjustment drive according to one of the preceding claims, characterized in that the lubricant uptake (58) is formed axially open at one end.

4. Adjustment drive according to one of the preceding claims, characterized in that each time a plurality of lubricant uptakes (58) are formed in one thread flank (57).

5. Adjustment drive according to one of the preceding claims, characterized in that the lubricant uptake (58) comprises an elongated lubrication groove (58).

6. Adjustment drive according to Claim 5, characterized in that the lubrication groove (58) has a spiral shape at least for a portion.

7. Adjustment drive according to Claim 6, characterized in that two lubrication grooves (58) are spiral shaped in opposite directions.

8. Adjustment drive according to one of the preceding claims, characterized in that lubricant uptakes (58) are arranged on one or both tooth flanks (57) of a thread tooth (56) and / or on one or both groove flanks of a thread groove.

9. Adjustment drive according to one of the preceding claims, characterized in that the threaded spindle (52) and / or the spindle nut (51) comprise a plastic.

10. Adjustment drive according to one of the preceding claims, characterized in that the threaded spindle (52) and / or the spindle nut (51) comprise a metallic material.

11. Adjustment drive according to one of the preceding claims, characterized in that the lubricant uptake (58) is filled with a lubricant, preferably with a grease.

12. Adjustment drive according to one of the preceding claims, characterized in that a motorized drive unit (55) is coupled to the threaded spindle (52) or the spindle nut (51) such that the threaded spindle (52) and the spindle nut (51) can be driven in rotation relative to each other.

13. Steering column (1) for a motor vehicle, having a support unit (2), which can be mounted on a vehicle chassis, and by which an actuator (3) is supported, in which a steering spindle (37) is rotatably mounted, and having an adjustment drive (5, 6), comprising a threaded spindle (52), engaging with an external thread in a spindle nut (51), and a drive unit (55), which is coupled to the threaded spindle (52) or the spindle nut (51) such that the threaded spindle (52) and the spindle nut (51) can be driven in rotation relative to each other, wherein the adjustment drive (5, 6) is connected to the support unit (2) or the actuator (3), characterized in that the adjustment drive (5, 6) is configured according to one of Claims 1 to 12.

14. Steering column according to Claim 13, characterized in that an adjustment drive (5, 6) is configured as a rotation spindle drive or a plunger spindle drive.

15. Steering column according to one of Claims 13 or 14, characterized in that it is configured as a steer-by-wire steering column.